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-rw-r--r--drivers/vfio/Kconfig35
-rw-r--r--drivers/vfio/Makefile9
-rw-r--r--drivers/vfio/pci/Kconfig27
-rw-r--r--drivers/vfio/pci/Makefile4
-rw-r--r--drivers/vfio/pci/vfio_pci.c1215
-rw-r--r--drivers/vfio/pci/vfio_pci_config.c1602
-rw-r--r--drivers/vfio/pci/vfio_pci_intrs.c675
-rw-r--r--drivers/vfio/pci/vfio_pci_private.h92
-rw-r--r--drivers/vfio/pci/vfio_pci_rdwr.c238
-rw-r--r--drivers/vfio/platform/Kconfig20
-rw-r--r--drivers/vfio/platform/Makefile8
-rw-r--r--drivers/vfio/platform/vfio_amba.c115
-rw-r--r--drivers/vfio/platform/vfio_platform.c103
-rw-r--r--drivers/vfio/platform/vfio_platform_common.c521
-rw-r--r--drivers/vfio/platform/vfio_platform_irq.c336
-rw-r--r--drivers/vfio/platform/vfio_platform_private.h85
-rw-r--r--drivers/vfio/vfio.c1612
-rw-r--r--drivers/vfio/vfio_iommu_spapr_tce.c392
-rw-r--r--drivers/vfio/vfio_iommu_type1.c1054
-rw-r--r--drivers/vfio/vfio_spapr_eeh.c100
-rw-r--r--drivers/vfio/virqfd.c226
21 files changed, 8469 insertions, 0 deletions
diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
new file mode 100644
index 000000000..7d092ddc8
--- /dev/null
+++ b/drivers/vfio/Kconfig
@@ -0,0 +1,35 @@
+config VFIO_IOMMU_TYPE1
+ tristate
+ depends on VFIO
+ default n
+
+config VFIO_IOMMU_SPAPR_TCE
+ tristate
+ depends on VFIO && SPAPR_TCE_IOMMU
+ default n
+
+config VFIO_SPAPR_EEH
+ tristate
+ depends on EEH && VFIO_IOMMU_SPAPR_TCE
+ default n
+
+config VFIO_VIRQFD
+ tristate
+ depends on VFIO && EVENTFD
+ default n
+
+menuconfig VFIO
+ tristate "VFIO Non-Privileged userspace driver framework"
+ depends on IOMMU_API
+ select VFIO_IOMMU_TYPE1 if (X86 || S390 || ARM_SMMU)
+ select VFIO_IOMMU_SPAPR_TCE if (PPC_POWERNV || PPC_PSERIES)
+ select VFIO_SPAPR_EEH if (PPC_POWERNV || PPC_PSERIES)
+ select ANON_INODES
+ help
+ VFIO provides a framework for secure userspace device drivers.
+ See Documentation/vfio.txt for more details.
+
+ If you don't know what to do here, say N.
+
+source "drivers/vfio/pci/Kconfig"
+source "drivers/vfio/platform/Kconfig"
diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile
new file mode 100644
index 000000000..7b8a31f63
--- /dev/null
+++ b/drivers/vfio/Makefile
@@ -0,0 +1,9 @@
+vfio_virqfd-y := virqfd.o
+
+obj-$(CONFIG_VFIO) += vfio.o
+obj-$(CONFIG_VFIO_VIRQFD) += vfio_virqfd.o
+obj-$(CONFIG_VFIO_IOMMU_TYPE1) += vfio_iommu_type1.o
+obj-$(CONFIG_VFIO_IOMMU_SPAPR_TCE) += vfio_iommu_spapr_tce.o
+obj-$(CONFIG_VFIO_SPAPR_EEH) += vfio_spapr_eeh.o
+obj-$(CONFIG_VFIO_PCI) += pci/
+obj-$(CONFIG_VFIO_PLATFORM) += platform/
diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
new file mode 100644
index 000000000..579d83bf5
--- /dev/null
+++ b/drivers/vfio/pci/Kconfig
@@ -0,0 +1,27 @@
+config VFIO_PCI
+ tristate "VFIO support for PCI devices"
+ depends on VFIO && PCI && EVENTFD
+ select VFIO_VIRQFD
+ help
+ Support for the PCI VFIO bus driver. This is required to make
+ use of PCI drivers using the VFIO framework.
+
+ If you don't know what to do here, say N.
+
+config VFIO_PCI_VGA
+ bool "VFIO PCI support for VGA devices"
+ depends on VFIO_PCI && X86 && VGA_ARB
+ help
+ Support for VGA extension to VFIO PCI. This exposes an additional
+ region on VGA devices for accessing legacy VGA addresses used by
+ BIOS and generic video drivers.
+
+ If you don't know what to do here, say N.
+
+config VFIO_PCI_MMAP
+ depends on VFIO_PCI
+ def_bool y if !S390
+
+config VFIO_PCI_INTX
+ depends on VFIO_PCI
+ def_bool y if !S390
diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
new file mode 100644
index 000000000..131079255
--- /dev/null
+++ b/drivers/vfio/pci/Makefile
@@ -0,0 +1,4 @@
+
+vfio-pci-y := vfio_pci.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
+
+obj-$(CONFIG_VFIO_PCI) += vfio-pci.o
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
new file mode 100644
index 000000000..e9851add6
--- /dev/null
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -0,0 +1,1215 @@
+/*
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/eventfd.h>
+#include <linux/file.h>
+#include <linux/interrupt.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/vgaarb.h>
+
+#include "vfio_pci_private.h"
+
+#define DRIVER_VERSION "0.2"
+#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
+#define DRIVER_DESC "VFIO PCI - User Level meta-driver"
+
+static char ids[1024] __initdata;
+module_param_string(ids, ids, sizeof(ids), 0);
+MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified");
+
+static bool nointxmask;
+module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(nointxmask,
+ "Disable support for PCI 2.3 style INTx masking. If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag.");
+
+#ifdef CONFIG_VFIO_PCI_VGA
+static bool disable_vga;
+module_param(disable_vga, bool, S_IRUGO);
+MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci");
+#endif
+
+static bool disable_idle_d3;
+module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(disable_idle_d3,
+ "Disable using the PCI D3 low power state for idle, unused devices");
+
+static DEFINE_MUTEX(driver_lock);
+
+static inline bool vfio_vga_disabled(void)
+{
+#ifdef CONFIG_VFIO_PCI_VGA
+ return disable_vga;
+#else
+ return true;
+#endif
+}
+
+/*
+ * Our VGA arbiter participation is limited since we don't know anything
+ * about the device itself. However, if the device is the only VGA device
+ * downstream of a bridge and VFIO VGA support is disabled, then we can
+ * safely return legacy VGA IO and memory as not decoded since the user
+ * has no way to get to it and routing can be disabled externally at the
+ * bridge.
+ */
+static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga)
+{
+ struct vfio_pci_device *vdev = opaque;
+ struct pci_dev *tmp = NULL, *pdev = vdev->pdev;
+ unsigned char max_busnr;
+ unsigned int decodes;
+
+ if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
+ return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
+ VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+
+ max_busnr = pci_bus_max_busnr(pdev->bus);
+ decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+
+ while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
+ if (tmp == pdev ||
+ pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
+ pci_is_root_bus(tmp->bus))
+ continue;
+
+ if (tmp->bus->number >= pdev->bus->number &&
+ tmp->bus->number <= max_busnr) {
+ pci_dev_put(tmp);
+ decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+ break;
+ }
+ }
+
+ return decodes;
+}
+
+static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
+{
+ return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
+}
+
+static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
+
+static int vfio_pci_enable(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int ret;
+ u16 cmd;
+ u8 msix_pos;
+
+ pci_set_power_state(pdev, PCI_D0);
+
+ /* Don't allow our initial saved state to include busmaster */
+ pci_clear_master(pdev);
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ vdev->reset_works = (pci_reset_function(pdev) == 0);
+ pci_save_state(pdev);
+ vdev->pci_saved_state = pci_store_saved_state(pdev);
+ if (!vdev->pci_saved_state)
+ pr_debug("%s: Couldn't store %s saved state\n",
+ __func__, dev_name(&pdev->dev));
+
+ ret = vfio_config_init(vdev);
+ if (ret) {
+ kfree(vdev->pci_saved_state);
+ vdev->pci_saved_state = NULL;
+ pci_disable_device(pdev);
+ return ret;
+ }
+
+ if (likely(!nointxmask))
+ vdev->pci_2_3 = pci_intx_mask_supported(pdev);
+
+ pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+ if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
+ cmd &= ~PCI_COMMAND_INTX_DISABLE;
+ pci_write_config_word(pdev, PCI_COMMAND, cmd);
+ }
+
+ msix_pos = pdev->msix_cap;
+ if (msix_pos) {
+ u16 flags;
+ u32 table;
+
+ pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
+ pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
+
+ vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
+ vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
+ vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
+ } else
+ vdev->msix_bar = 0xFF;
+
+ if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
+ vdev->has_vga = true;
+
+ return 0;
+}
+
+static void vfio_pci_disable(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int bar;
+
+ /* Stop the device from further DMA */
+ pci_clear_master(pdev);
+
+ vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
+ VFIO_IRQ_SET_ACTION_TRIGGER,
+ vdev->irq_type, 0, 0, NULL);
+
+ vdev->virq_disabled = false;
+
+ vfio_config_free(vdev);
+
+ for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
+ if (!vdev->barmap[bar])
+ continue;
+ pci_iounmap(pdev, vdev->barmap[bar]);
+ pci_release_selected_regions(pdev, 1 << bar);
+ vdev->barmap[bar] = NULL;
+ }
+
+ vdev->needs_reset = true;
+
+ /*
+ * If we have saved state, restore it. If we can reset the device,
+ * even better. Resetting with current state seems better than
+ * nothing, but saving and restoring current state without reset
+ * is just busy work.
+ */
+ if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
+ pr_info("%s: Couldn't reload %s saved state\n",
+ __func__, dev_name(&pdev->dev));
+
+ if (!vdev->reset_works)
+ goto out;
+
+ pci_save_state(pdev);
+ }
+
+ /*
+ * Disable INTx and MSI, presumably to avoid spurious interrupts
+ * during reset. Stolen from pci_reset_function()
+ */
+ pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
+
+ /*
+ * Try to reset the device. The success of this is dependent on
+ * being able to lock the device, which is not always possible.
+ */
+ if (vdev->reset_works && !pci_try_reset_function(pdev))
+ vdev->needs_reset = false;
+
+ pci_restore_state(pdev);
+out:
+ pci_disable_device(pdev);
+
+ vfio_pci_try_bus_reset(vdev);
+
+ if (!disable_idle_d3)
+ pci_set_power_state(pdev, PCI_D3hot);
+}
+
+static void vfio_pci_release(void *device_data)
+{
+ struct vfio_pci_device *vdev = device_data;
+
+ mutex_lock(&driver_lock);
+
+ if (!(--vdev->refcnt)) {
+ vfio_spapr_pci_eeh_release(vdev->pdev);
+ vfio_pci_disable(vdev);
+ }
+
+ mutex_unlock(&driver_lock);
+
+ module_put(THIS_MODULE);
+}
+
+static int vfio_pci_open(void *device_data)
+{
+ struct vfio_pci_device *vdev = device_data;
+ int ret = 0;
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ mutex_lock(&driver_lock);
+
+ if (!vdev->refcnt) {
+ ret = vfio_pci_enable(vdev);
+ if (ret)
+ goto error;
+
+ vfio_spapr_pci_eeh_open(vdev->pdev);
+ }
+ vdev->refcnt++;
+error:
+ mutex_unlock(&driver_lock);
+ if (ret)
+ module_put(THIS_MODULE);
+ return ret;
+}
+
+static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
+{
+ if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
+ u8 pin;
+ pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
+ if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && pin)
+ return 1;
+
+ } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
+ u8 pos;
+ u16 flags;
+
+ pos = vdev->pdev->msi_cap;
+ if (pos) {
+ pci_read_config_word(vdev->pdev,
+ pos + PCI_MSI_FLAGS, &flags);
+ return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
+ }
+ } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
+ u8 pos;
+ u16 flags;
+
+ pos = vdev->pdev->msix_cap;
+ if (pos) {
+ pci_read_config_word(vdev->pdev,
+ pos + PCI_MSIX_FLAGS, &flags);
+
+ return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
+ }
+ } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
+ if (pci_is_pcie(vdev->pdev))
+ return 1;
+ } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
+{
+ (*(int *)data)++;
+ return 0;
+}
+
+struct vfio_pci_fill_info {
+ int max;
+ int cur;
+ struct vfio_pci_dependent_device *devices;
+};
+
+static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
+{
+ struct vfio_pci_fill_info *fill = data;
+ struct iommu_group *iommu_group;
+
+ if (fill->cur == fill->max)
+ return -EAGAIN; /* Something changed, try again */
+
+ iommu_group = iommu_group_get(&pdev->dev);
+ if (!iommu_group)
+ return -EPERM; /* Cannot reset non-isolated devices */
+
+ fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
+ fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
+ fill->devices[fill->cur].bus = pdev->bus->number;
+ fill->devices[fill->cur].devfn = pdev->devfn;
+ fill->cur++;
+ iommu_group_put(iommu_group);
+ return 0;
+}
+
+struct vfio_pci_group_entry {
+ struct vfio_group *group;
+ int id;
+};
+
+struct vfio_pci_group_info {
+ int count;
+ struct vfio_pci_group_entry *groups;
+};
+
+static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
+{
+ struct vfio_pci_group_info *info = data;
+ struct iommu_group *group;
+ int id, i;
+
+ group = iommu_group_get(&pdev->dev);
+ if (!group)
+ return -EPERM;
+
+ id = iommu_group_id(group);
+
+ for (i = 0; i < info->count; i++)
+ if (info->groups[i].id == id)
+ break;
+
+ iommu_group_put(group);
+
+ return (i == info->count) ? -EINVAL : 0;
+}
+
+static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
+{
+ for (; pdev; pdev = pdev->bus->self)
+ if (pdev->bus == slot->bus)
+ return (pdev->slot == slot);
+ return false;
+}
+
+struct vfio_pci_walk_info {
+ int (*fn)(struct pci_dev *, void *data);
+ void *data;
+ struct pci_dev *pdev;
+ bool slot;
+ int ret;
+};
+
+static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
+{
+ struct vfio_pci_walk_info *walk = data;
+
+ if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
+ walk->ret = walk->fn(pdev, walk->data);
+
+ return walk->ret;
+}
+
+static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
+ int (*fn)(struct pci_dev *,
+ void *data), void *data,
+ bool slot)
+{
+ struct vfio_pci_walk_info walk = {
+ .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
+ };
+
+ pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
+
+ return walk.ret;
+}
+
+static long vfio_pci_ioctl(void *device_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_pci_device *vdev = device_data;
+ unsigned long minsz;
+
+ if (cmd == VFIO_DEVICE_GET_INFO) {
+ struct vfio_device_info info;
+
+ minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ info.flags = VFIO_DEVICE_FLAGS_PCI;
+
+ if (vdev->reset_works)
+ info.flags |= VFIO_DEVICE_FLAGS_RESET;
+
+ info.num_regions = VFIO_PCI_NUM_REGIONS;
+ info.num_irqs = VFIO_PCI_NUM_IRQS;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+
+ } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
+ struct pci_dev *pdev = vdev->pdev;
+ struct vfio_region_info info;
+
+ minsz = offsetofend(struct vfio_region_info, offset);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ switch (info.index) {
+ case VFIO_PCI_CONFIG_REGION_INDEX:
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = pdev->cfg_size;
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+ break;
+ case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = pci_resource_len(pdev, info.index);
+ if (!info.size) {
+ info.flags = 0;
+ break;
+ }
+
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+ if (IS_ENABLED(CONFIG_VFIO_PCI_MMAP) &&
+ pci_resource_flags(pdev, info.index) &
+ IORESOURCE_MEM && info.size >= PAGE_SIZE)
+ info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
+ break;
+ case VFIO_PCI_ROM_REGION_INDEX:
+ {
+ void __iomem *io;
+ size_t size;
+
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.flags = 0;
+
+ /* Report the BAR size, not the ROM size */
+ info.size = pci_resource_len(pdev, info.index);
+ if (!info.size)
+ break;
+
+ /* Is it really there? */
+ io = pci_map_rom(pdev, &size);
+ if (!io || !size) {
+ info.size = 0;
+ break;
+ }
+ pci_unmap_rom(pdev, io);
+
+ info.flags = VFIO_REGION_INFO_FLAG_READ;
+ break;
+ }
+ case VFIO_PCI_VGA_REGION_INDEX:
+ if (!vdev->has_vga)
+ return -EINVAL;
+
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = 0xc0000;
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+
+ } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
+ struct vfio_irq_info info;
+
+ minsz = offsetofend(struct vfio_irq_info, count);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
+ return -EINVAL;
+
+ switch (info.index) {
+ case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
+ case VFIO_PCI_REQ_IRQ_INDEX:
+ break;
+ case VFIO_PCI_ERR_IRQ_INDEX:
+ if (pci_is_pcie(vdev->pdev))
+ break;
+ /* pass thru to return error */
+ default:
+ return -EINVAL;
+ }
+
+ info.flags = VFIO_IRQ_INFO_EVENTFD;
+
+ info.count = vfio_pci_get_irq_count(vdev, info.index);
+
+ if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
+ info.flags |= (VFIO_IRQ_INFO_MASKABLE |
+ VFIO_IRQ_INFO_AUTOMASKED);
+ else
+ info.flags |= VFIO_IRQ_INFO_NORESIZE;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+
+ } else if (cmd == VFIO_DEVICE_SET_IRQS) {
+ struct vfio_irq_set hdr;
+ u8 *data = NULL;
+ int ret = 0;
+
+ minsz = offsetofend(struct vfio_irq_set, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS ||
+ hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
+ VFIO_IRQ_SET_ACTION_TYPE_MASK))
+ return -EINVAL;
+
+ if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
+ size_t size;
+ int max = vfio_pci_get_irq_count(vdev, hdr.index);
+
+ if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
+ size = sizeof(uint8_t);
+ else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
+ size = sizeof(int32_t);
+ else
+ return -EINVAL;
+
+ if (hdr.argsz - minsz < hdr.count * size ||
+ hdr.start >= max || hdr.start + hdr.count > max)
+ return -EINVAL;
+
+ data = memdup_user((void __user *)(arg + minsz),
+ hdr.count * size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ }
+
+ mutex_lock(&vdev->igate);
+
+ ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
+ hdr.start, hdr.count, data);
+
+ mutex_unlock(&vdev->igate);
+ kfree(data);
+
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_RESET) {
+ return vdev->reset_works ?
+ pci_try_reset_function(vdev->pdev) : -EINVAL;
+
+ } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
+ struct vfio_pci_hot_reset_info hdr;
+ struct vfio_pci_fill_info fill = { 0 };
+ struct vfio_pci_dependent_device *devices = NULL;
+ bool slot = false;
+ int ret = 0;
+
+ minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz)
+ return -EINVAL;
+
+ hdr.flags = 0;
+
+ /* Can we do a slot or bus reset or neither? */
+ if (!pci_probe_reset_slot(vdev->pdev->slot))
+ slot = true;
+ else if (pci_probe_reset_bus(vdev->pdev->bus))
+ return -ENODEV;
+
+ /* How many devices are affected? */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_count_devs,
+ &fill.max, slot);
+ if (ret)
+ return ret;
+
+ WARN_ON(!fill.max); /* Should always be at least one */
+
+ /*
+ * If there's enough space, fill it now, otherwise return
+ * -ENOSPC and the number of devices affected.
+ */
+ if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
+ ret = -ENOSPC;
+ hdr.count = fill.max;
+ goto reset_info_exit;
+ }
+
+ devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
+ if (!devices)
+ return -ENOMEM;
+
+ fill.devices = devices;
+
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_fill_devs,
+ &fill, slot);
+
+ /*
+ * If a device was removed between counting and filling,
+ * we may come up short of fill.max. If a device was
+ * added, we'll have a return of -EAGAIN above.
+ */
+ if (!ret)
+ hdr.count = fill.cur;
+
+reset_info_exit:
+ if (copy_to_user((void __user *)arg, &hdr, minsz))
+ ret = -EFAULT;
+
+ if (!ret) {
+ if (copy_to_user((void __user *)(arg + minsz), devices,
+ hdr.count * sizeof(*devices)))
+ ret = -EFAULT;
+ }
+
+ kfree(devices);
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
+ struct vfio_pci_hot_reset hdr;
+ int32_t *group_fds;
+ struct vfio_pci_group_entry *groups;
+ struct vfio_pci_group_info info;
+ bool slot = false;
+ int i, count = 0, ret = 0;
+
+ minsz = offsetofend(struct vfio_pci_hot_reset, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz || hdr.flags)
+ return -EINVAL;
+
+ /* Can we do a slot or bus reset or neither? */
+ if (!pci_probe_reset_slot(vdev->pdev->slot))
+ slot = true;
+ else if (pci_probe_reset_bus(vdev->pdev->bus))
+ return -ENODEV;
+
+ /*
+ * We can't let userspace give us an arbitrarily large
+ * buffer to copy, so verify how many we think there
+ * could be. Note groups can have multiple devices so
+ * one group per device is the max.
+ */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_count_devs,
+ &count, slot);
+ if (ret)
+ return ret;
+
+ /* Somewhere between 1 and count is OK */
+ if (!hdr.count || hdr.count > count)
+ return -EINVAL;
+
+ group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
+ groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
+ if (!group_fds || !groups) {
+ kfree(group_fds);
+ kfree(groups);
+ return -ENOMEM;
+ }
+
+ if (copy_from_user(group_fds, (void __user *)(arg + minsz),
+ hdr.count * sizeof(*group_fds))) {
+ kfree(group_fds);
+ kfree(groups);
+ return -EFAULT;
+ }
+
+ /*
+ * For each group_fd, get the group through the vfio external
+ * user interface and store the group and iommu ID. This
+ * ensures the group is held across the reset.
+ */
+ for (i = 0; i < hdr.count; i++) {
+ struct vfio_group *group;
+ struct fd f = fdget(group_fds[i]);
+ if (!f.file) {
+ ret = -EBADF;
+ break;
+ }
+
+ group = vfio_group_get_external_user(f.file);
+ fdput(f);
+ if (IS_ERR(group)) {
+ ret = PTR_ERR(group);
+ break;
+ }
+
+ groups[i].group = group;
+ groups[i].id = vfio_external_user_iommu_id(group);
+ }
+
+ kfree(group_fds);
+
+ /* release reference to groups on error */
+ if (ret)
+ goto hot_reset_release;
+
+ info.count = hdr.count;
+ info.groups = groups;
+
+ /*
+ * Test whether all the affected devices are contained
+ * by the set of groups provided by the user.
+ */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_validate_devs,
+ &info, slot);
+ if (!ret)
+ /* User has access, do the reset */
+ ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
+ pci_try_reset_bus(vdev->pdev->bus);
+
+hot_reset_release:
+ for (i--; i >= 0; i--)
+ vfio_group_put_external_user(groups[i].group);
+
+ kfree(groups);
+ return ret;
+ }
+
+ return -ENOTTY;
+}
+
+static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
+ size_t count, loff_t *ppos, bool iswrite)
+{
+ unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
+ struct vfio_pci_device *vdev = device_data;
+
+ if (index >= VFIO_PCI_NUM_REGIONS)
+ return -EINVAL;
+
+ switch (index) {
+ case VFIO_PCI_CONFIG_REGION_INDEX:
+ return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
+
+ case VFIO_PCI_ROM_REGION_INDEX:
+ if (iswrite)
+ return -EINVAL;
+ return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
+
+ case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
+ return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
+
+ case VFIO_PCI_VGA_REGION_INDEX:
+ return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
+ }
+
+ return -EINVAL;
+}
+
+static ssize_t vfio_pci_read(void *device_data, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (!count)
+ return 0;
+
+ return vfio_pci_rw(device_data, buf, count, ppos, false);
+}
+
+static ssize_t vfio_pci_write(void *device_data, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (!count)
+ return 0;
+
+ return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
+}
+
+static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
+{
+ struct vfio_pci_device *vdev = device_data;
+ struct pci_dev *pdev = vdev->pdev;
+ unsigned int index;
+ u64 phys_len, req_len, pgoff, req_start;
+ int ret;
+
+ index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
+
+ if (vma->vm_end < vma->vm_start)
+ return -EINVAL;
+ if ((vma->vm_flags & VM_SHARED) == 0)
+ return -EINVAL;
+ if (index >= VFIO_PCI_ROM_REGION_INDEX)
+ return -EINVAL;
+ if (!(pci_resource_flags(pdev, index) & IORESOURCE_MEM))
+ return -EINVAL;
+
+ phys_len = pci_resource_len(pdev, index);
+ req_len = vma->vm_end - vma->vm_start;
+ pgoff = vma->vm_pgoff &
+ ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
+ req_start = pgoff << PAGE_SHIFT;
+
+ if (phys_len < PAGE_SIZE || req_start + req_len > phys_len)
+ return -EINVAL;
+
+ if (index == vdev->msix_bar) {
+ /*
+ * Disallow mmaps overlapping the MSI-X table; users don't
+ * get to touch this directly. We could find somewhere
+ * else to map the overlap, but page granularity is only
+ * a recommendation, not a requirement, so the user needs
+ * to know which bits are real. Requiring them to mmap
+ * around the table makes that clear.
+ */
+
+ /* If neither entirely above nor below, then it overlaps */
+ if (!(req_start >= vdev->msix_offset + vdev->msix_size ||
+ req_start + req_len <= vdev->msix_offset))
+ return -EINVAL;
+ }
+
+ /*
+ * Even though we don't make use of the barmap for the mmap,
+ * we need to request the region and the barmap tracks that.
+ */
+ if (!vdev->barmap[index]) {
+ ret = pci_request_selected_regions(pdev,
+ 1 << index, "vfio-pci");
+ if (ret)
+ return ret;
+
+ vdev->barmap[index] = pci_iomap(pdev, index, 0);
+ }
+
+ vma->vm_private_data = vdev;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
+
+ return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ req_len, vma->vm_page_prot);
+}
+
+static void vfio_pci_request(void *device_data, unsigned int count)
+{
+ struct vfio_pci_device *vdev = device_data;
+
+ mutex_lock(&vdev->igate);
+
+ if (vdev->req_trigger) {
+ if (!(count % 10))
+ dev_notice_ratelimited(&vdev->pdev->dev,
+ "Relaying device request to user (#%u)\n",
+ count);
+ eventfd_signal(vdev->req_trigger, 1);
+ } else if (count == 0) {
+ dev_warn(&vdev->pdev->dev,
+ "No device request channel registered, blocked until released by user\n");
+ }
+
+ mutex_unlock(&vdev->igate);
+}
+
+static const struct vfio_device_ops vfio_pci_ops = {
+ .name = "vfio-pci",
+ .open = vfio_pci_open,
+ .release = vfio_pci_release,
+ .ioctl = vfio_pci_ioctl,
+ .read = vfio_pci_read,
+ .write = vfio_pci_write,
+ .mmap = vfio_pci_mmap,
+ .request = vfio_pci_request,
+};
+
+static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct vfio_pci_device *vdev;
+ struct iommu_group *group;
+ int ret;
+
+ if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
+ return -EINVAL;
+
+ group = iommu_group_get(&pdev->dev);
+ if (!group)
+ return -EINVAL;
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev) {
+ iommu_group_put(group);
+ return -ENOMEM;
+ }
+
+ vdev->pdev = pdev;
+ vdev->irq_type = VFIO_PCI_NUM_IRQS;
+ mutex_init(&vdev->igate);
+ spin_lock_init(&vdev->irqlock);
+
+ ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
+ if (ret) {
+ iommu_group_put(group);
+ kfree(vdev);
+ return ret;
+ }
+
+ if (vfio_pci_is_vga(pdev)) {
+ vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode);
+ vga_set_legacy_decoding(pdev,
+ vfio_pci_set_vga_decode(vdev, false));
+ }
+
+ if (!disable_idle_d3) {
+ /*
+ * pci-core sets the device power state to an unknown value at
+ * bootup and after being removed from a driver. The only
+ * transition it allows from this unknown state is to D0, which
+ * typically happens when a driver calls pci_enable_device().
+ * We're not ready to enable the device yet, but we do want to
+ * be able to get to D3. Therefore first do a D0 transition
+ * before going to D3.
+ */
+ pci_set_power_state(pdev, PCI_D0);
+ pci_set_power_state(pdev, PCI_D3hot);
+ }
+
+ return ret;
+}
+
+static void vfio_pci_remove(struct pci_dev *pdev)
+{
+ struct vfio_pci_device *vdev;
+
+ vdev = vfio_del_group_dev(&pdev->dev);
+ if (!vdev)
+ return;
+
+ iommu_group_put(pdev->dev.iommu_group);
+ kfree(vdev);
+
+ if (vfio_pci_is_vga(pdev)) {
+ vga_client_register(pdev, NULL, NULL, NULL);
+ vga_set_legacy_decoding(pdev,
+ VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
+ VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
+ }
+
+ if (!disable_idle_d3)
+ pci_set_power_state(pdev, PCI_D0);
+}
+
+static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
+ pci_channel_state_t state)
+{
+ struct vfio_pci_device *vdev;
+ struct vfio_device *device;
+
+ device = vfio_device_get_from_dev(&pdev->dev);
+ if (device == NULL)
+ return PCI_ERS_RESULT_DISCONNECT;
+
+ vdev = vfio_device_data(device);
+ if (vdev == NULL) {
+ vfio_device_put(device);
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+
+ mutex_lock(&vdev->igate);
+
+ if (vdev->err_trigger)
+ eventfd_signal(vdev->err_trigger, 1);
+
+ mutex_unlock(&vdev->igate);
+
+ vfio_device_put(device);
+
+ return PCI_ERS_RESULT_CAN_RECOVER;
+}
+
+static struct pci_error_handlers vfio_err_handlers = {
+ .error_detected = vfio_pci_aer_err_detected,
+};
+
+static struct pci_driver vfio_pci_driver = {
+ .name = "vfio-pci",
+ .id_table = NULL, /* only dynamic ids */
+ .probe = vfio_pci_probe,
+ .remove = vfio_pci_remove,
+ .err_handler = &vfio_err_handlers,
+};
+
+struct vfio_devices {
+ struct vfio_device **devices;
+ int cur_index;
+ int max_index;
+};
+
+static int vfio_pci_get_devs(struct pci_dev *pdev, void *data)
+{
+ struct vfio_devices *devs = data;
+ struct pci_driver *pci_drv = ACCESS_ONCE(pdev->driver);
+
+ if (pci_drv != &vfio_pci_driver)
+ return -EBUSY;
+
+ if (devs->cur_index == devs->max_index)
+ return -ENOSPC;
+
+ devs->devices[devs->cur_index] = vfio_device_get_from_dev(&pdev->dev);
+ if (!devs->devices[devs->cur_index])
+ return -EINVAL;
+
+ devs->cur_index++;
+ return 0;
+}
+
+/*
+ * Attempt to do a bus/slot reset if there are devices affected by a reset for
+ * this device that are needs_reset and all of the affected devices are unused
+ * (!refcnt). Callers are required to hold driver_lock when calling this to
+ * prevent device opens and concurrent bus reset attempts. We prevent device
+ * unbinds by acquiring and holding a reference to the vfio_device.
+ *
+ * NB: vfio-core considers a group to be viable even if some devices are
+ * bound to drivers like pci-stub or pcieport. Here we require all devices
+ * to be bound to vfio_pci since that's the only way we can be sure they
+ * stay put.
+ */
+static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
+{
+ struct vfio_devices devs = { .cur_index = 0 };
+ int i = 0, ret = -EINVAL;
+ bool needs_reset = false, slot = false;
+ struct vfio_pci_device *tmp;
+
+ if (!pci_probe_reset_slot(vdev->pdev->slot))
+ slot = true;
+ else if (pci_probe_reset_bus(vdev->pdev->bus))
+ return;
+
+ if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs,
+ &i, slot) || !i)
+ return;
+
+ devs.max_index = i;
+ devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL);
+ if (!devs.devices)
+ return;
+
+ if (vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_get_devs, &devs, slot))
+ goto put_devs;
+
+ for (i = 0; i < devs.cur_index; i++) {
+ tmp = vfio_device_data(devs.devices[i]);
+ if (tmp->needs_reset)
+ needs_reset = true;
+ if (tmp->refcnt)
+ goto put_devs;
+ }
+
+ if (needs_reset)
+ ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
+ pci_try_reset_bus(vdev->pdev->bus);
+
+put_devs:
+ for (i = 0; i < devs.cur_index; i++) {
+ tmp = vfio_device_data(devs.devices[i]);
+ if (!ret)
+ tmp->needs_reset = false;
+
+ if (!tmp->refcnt && !disable_idle_d3)
+ pci_set_power_state(tmp->pdev, PCI_D3hot);
+
+ vfio_device_put(devs.devices[i]);
+ }
+
+ kfree(devs.devices);
+}
+
+static void __exit vfio_pci_cleanup(void)
+{
+ pci_unregister_driver(&vfio_pci_driver);
+ vfio_pci_uninit_perm_bits();
+}
+
+static void __init vfio_pci_fill_ids(void)
+{
+ char *p, *id;
+ int rc;
+
+ /* no ids passed actually */
+ if (ids[0] == '\0')
+ return;
+
+ /* add ids specified in the module parameter */
+ p = ids;
+ while ((id = strsep(&p, ","))) {
+ unsigned int vendor, device, subvendor = PCI_ANY_ID,
+ subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
+ int fields;
+
+ if (!strlen(id))
+ continue;
+
+ fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
+ &vendor, &device, &subvendor, &subdevice,
+ &class, &class_mask);
+
+ if (fields < 2) {
+ pr_warn("invalid id string \"%s\"\n", id);
+ continue;
+ }
+
+ rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
+ subvendor, subdevice, class, class_mask, 0);
+ if (rc)
+ pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n",
+ vendor, device, subvendor, subdevice,
+ class, class_mask, rc);
+ else
+ pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n",
+ vendor, device, subvendor, subdevice,
+ class, class_mask);
+ }
+}
+
+static int __init vfio_pci_init(void)
+{
+ int ret;
+
+ /* Allocate shared config space permision data used by all devices */
+ ret = vfio_pci_init_perm_bits();
+ if (ret)
+ return ret;
+
+ /* Register and scan for devices */
+ ret = pci_register_driver(&vfio_pci_driver);
+ if (ret)
+ goto out_driver;
+
+ vfio_pci_fill_ids();
+
+ return 0;
+
+out_driver:
+ vfio_pci_uninit_perm_bits();
+ return ret;
+}
+
+module_init(vfio_pci_init);
+module_exit(vfio_pci_cleanup);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
new file mode 100644
index 000000000..ff75ca31a
--- /dev/null
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -0,0 +1,1602 @@
+/*
+ * VFIO PCI config space virtualization
+ *
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+/*
+ * This code handles reading and writing of PCI configuration registers.
+ * This is hairy because we want to allow a lot of flexibility to the
+ * user driver, but cannot trust it with all of the config fields.
+ * Tables determine which fields can be read and written, as well as
+ * which fields are 'virtualized' - special actions and translations to
+ * make it appear to the user that he has control, when in fact things
+ * must be negotiated with the underlying OS.
+ */
+
+#include <linux/fs.h>
+#include <linux/pci.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/slab.h>
+
+#include "vfio_pci_private.h"
+
+#define PCI_CFG_SPACE_SIZE 256
+
+/* Useful "pseudo" capabilities */
+#define PCI_CAP_ID_BASIC 0
+#define PCI_CAP_ID_INVALID 0xFF
+
+#define is_bar(offset) \
+ ((offset >= PCI_BASE_ADDRESS_0 && offset < PCI_BASE_ADDRESS_5 + 4) || \
+ (offset >= PCI_ROM_ADDRESS && offset < PCI_ROM_ADDRESS + 4))
+
+/*
+ * Lengths of PCI Config Capabilities
+ * 0: Removed from the user visible capability list
+ * FF: Variable length
+ */
+static u8 pci_cap_length[] = {
+ [PCI_CAP_ID_BASIC] = PCI_STD_HEADER_SIZEOF, /* pci config header */
+ [PCI_CAP_ID_PM] = PCI_PM_SIZEOF,
+ [PCI_CAP_ID_AGP] = PCI_AGP_SIZEOF,
+ [PCI_CAP_ID_VPD] = PCI_CAP_VPD_SIZEOF,
+ [PCI_CAP_ID_SLOTID] = 0, /* bridge - don't care */
+ [PCI_CAP_ID_MSI] = 0xFF, /* 10, 14, 20, or 24 */
+ [PCI_CAP_ID_CHSWP] = 0, /* cpci - not yet */
+ [PCI_CAP_ID_PCIX] = 0xFF, /* 8 or 24 */
+ [PCI_CAP_ID_HT] = 0xFF, /* hypertransport */
+ [PCI_CAP_ID_VNDR] = 0xFF, /* variable */
+ [PCI_CAP_ID_DBG] = 0, /* debug - don't care */
+ [PCI_CAP_ID_CCRC] = 0, /* cpci - not yet */
+ [PCI_CAP_ID_SHPC] = 0, /* hotswap - not yet */
+ [PCI_CAP_ID_SSVID] = 0, /* bridge - don't care */
+ [PCI_CAP_ID_AGP3] = 0, /* AGP8x - not yet */
+ [PCI_CAP_ID_SECDEV] = 0, /* secure device not yet */
+ [PCI_CAP_ID_EXP] = 0xFF, /* 20 or 44 */
+ [PCI_CAP_ID_MSIX] = PCI_CAP_MSIX_SIZEOF,
+ [PCI_CAP_ID_SATA] = 0xFF,
+ [PCI_CAP_ID_AF] = PCI_CAP_AF_SIZEOF,
+};
+
+/*
+ * Lengths of PCIe/PCI-X Extended Config Capabilities
+ * 0: Removed or masked from the user visible capabilty list
+ * FF: Variable length
+ */
+static u16 pci_ext_cap_length[] = {
+ [PCI_EXT_CAP_ID_ERR] = PCI_ERR_ROOT_COMMAND,
+ [PCI_EXT_CAP_ID_VC] = 0xFF,
+ [PCI_EXT_CAP_ID_DSN] = PCI_EXT_CAP_DSN_SIZEOF,
+ [PCI_EXT_CAP_ID_PWR] = PCI_EXT_CAP_PWR_SIZEOF,
+ [PCI_EXT_CAP_ID_RCLD] = 0, /* root only - don't care */
+ [PCI_EXT_CAP_ID_RCILC] = 0, /* root only - don't care */
+ [PCI_EXT_CAP_ID_RCEC] = 0, /* root only - don't care */
+ [PCI_EXT_CAP_ID_MFVC] = 0xFF,
+ [PCI_EXT_CAP_ID_VC9] = 0xFF, /* same as CAP_ID_VC */
+ [PCI_EXT_CAP_ID_RCRB] = 0, /* root only - don't care */
+ [PCI_EXT_CAP_ID_VNDR] = 0xFF,
+ [PCI_EXT_CAP_ID_CAC] = 0, /* obsolete */
+ [PCI_EXT_CAP_ID_ACS] = 0xFF,
+ [PCI_EXT_CAP_ID_ARI] = PCI_EXT_CAP_ARI_SIZEOF,
+ [PCI_EXT_CAP_ID_ATS] = PCI_EXT_CAP_ATS_SIZEOF,
+ [PCI_EXT_CAP_ID_SRIOV] = PCI_EXT_CAP_SRIOV_SIZEOF,
+ [PCI_EXT_CAP_ID_MRIOV] = 0, /* not yet */
+ [PCI_EXT_CAP_ID_MCAST] = PCI_EXT_CAP_MCAST_ENDPOINT_SIZEOF,
+ [PCI_EXT_CAP_ID_PRI] = PCI_EXT_CAP_PRI_SIZEOF,
+ [PCI_EXT_CAP_ID_AMD_XXX] = 0, /* not yet */
+ [PCI_EXT_CAP_ID_REBAR] = 0xFF,
+ [PCI_EXT_CAP_ID_DPA] = 0xFF,
+ [PCI_EXT_CAP_ID_TPH] = 0xFF,
+ [PCI_EXT_CAP_ID_LTR] = PCI_EXT_CAP_LTR_SIZEOF,
+ [PCI_EXT_CAP_ID_SECPCI] = 0, /* not yet */
+ [PCI_EXT_CAP_ID_PMUX] = 0, /* not yet */
+ [PCI_EXT_CAP_ID_PASID] = 0, /* not yet */
+};
+
+/*
+ * Read/Write Permission Bits - one bit for each bit in capability
+ * Any field can be read if it exists, but what is read depends on
+ * whether the field is 'virtualized', or just pass thru to the
+ * hardware. Any virtualized field is also virtualized for writes.
+ * Writes are only permitted if they have a 1 bit here.
+ */
+struct perm_bits {
+ u8 *virt; /* read/write virtual data, not hw */
+ u8 *write; /* writeable bits */
+ int (*readfn)(struct vfio_pci_device *vdev, int pos, int count,
+ struct perm_bits *perm, int offset, __le32 *val);
+ int (*writefn)(struct vfio_pci_device *vdev, int pos, int count,
+ struct perm_bits *perm, int offset, __le32 val);
+};
+
+#define NO_VIRT 0
+#define ALL_VIRT 0xFFFFFFFFU
+#define NO_WRITE 0
+#define ALL_WRITE 0xFFFFFFFFU
+
+static int vfio_user_config_read(struct pci_dev *pdev, int offset,
+ __le32 *val, int count)
+{
+ int ret = -EINVAL;
+ u32 tmp_val = 0;
+
+ switch (count) {
+ case 1:
+ {
+ u8 tmp;
+ ret = pci_user_read_config_byte(pdev, offset, &tmp);
+ tmp_val = tmp;
+ break;
+ }
+ case 2:
+ {
+ u16 tmp;
+ ret = pci_user_read_config_word(pdev, offset, &tmp);
+ tmp_val = tmp;
+ break;
+ }
+ case 4:
+ ret = pci_user_read_config_dword(pdev, offset, &tmp_val);
+ break;
+ }
+
+ *val = cpu_to_le32(tmp_val);
+
+ return pcibios_err_to_errno(ret);
+}
+
+static int vfio_user_config_write(struct pci_dev *pdev, int offset,
+ __le32 val, int count)
+{
+ int ret = -EINVAL;
+ u32 tmp_val = le32_to_cpu(val);
+
+ switch (count) {
+ case 1:
+ ret = pci_user_write_config_byte(pdev, offset, tmp_val);
+ break;
+ case 2:
+ ret = pci_user_write_config_word(pdev, offset, tmp_val);
+ break;
+ case 4:
+ ret = pci_user_write_config_dword(pdev, offset, tmp_val);
+ break;
+ }
+
+ return pcibios_err_to_errno(ret);
+}
+
+static int vfio_default_config_read(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 *val)
+{
+ __le32 virt = 0;
+
+ memcpy(val, vdev->vconfig + pos, count);
+
+ memcpy(&virt, perm->virt + offset, count);
+
+ /* Any non-virtualized bits? */
+ if (cpu_to_le32(~0U >> (32 - (count * 8))) != virt) {
+ struct pci_dev *pdev = vdev->pdev;
+ __le32 phys_val = 0;
+ int ret;
+
+ ret = vfio_user_config_read(pdev, pos, &phys_val, count);
+ if (ret)
+ return ret;
+
+ *val = (phys_val & ~virt) | (*val & virt);
+ }
+
+ return count;
+}
+
+static int vfio_default_config_write(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 val)
+{
+ __le32 virt = 0, write = 0;
+
+ memcpy(&write, perm->write + offset, count);
+
+ if (!write)
+ return count; /* drop, no writable bits */
+
+ memcpy(&virt, perm->virt + offset, count);
+
+ /* Virtualized and writable bits go to vconfig */
+ if (write & virt) {
+ __le32 virt_val = 0;
+
+ memcpy(&virt_val, vdev->vconfig + pos, count);
+
+ virt_val &= ~(write & virt);
+ virt_val |= (val & (write & virt));
+
+ memcpy(vdev->vconfig + pos, &virt_val, count);
+ }
+
+ /* Non-virtualzed and writable bits go to hardware */
+ if (write & ~virt) {
+ struct pci_dev *pdev = vdev->pdev;
+ __le32 phys_val = 0;
+ int ret;
+
+ ret = vfio_user_config_read(pdev, pos, &phys_val, count);
+ if (ret)
+ return ret;
+
+ phys_val &= ~(write & ~virt);
+ phys_val |= (val & (write & ~virt));
+
+ ret = vfio_user_config_write(pdev, pos, phys_val, count);
+ if (ret)
+ return ret;
+ }
+
+ return count;
+}
+
+/* Allow direct read from hardware, except for capability next pointer */
+static int vfio_direct_config_read(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 *val)
+{
+ int ret;
+
+ ret = vfio_user_config_read(vdev->pdev, pos, val, count);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ if (pos >= PCI_CFG_SPACE_SIZE) { /* Extended cap header mangling */
+ if (offset < 4)
+ memcpy(val, vdev->vconfig + pos, count);
+ } else if (pos >= PCI_STD_HEADER_SIZEOF) { /* Std cap mangling */
+ if (offset == PCI_CAP_LIST_ID && count > 1)
+ memcpy(val, vdev->vconfig + pos,
+ min(PCI_CAP_FLAGS, count));
+ else if (offset == PCI_CAP_LIST_NEXT)
+ memcpy(val, vdev->vconfig + pos, 1);
+ }
+
+ return count;
+}
+
+/* Raw access skips any kind of virtualization */
+static int vfio_raw_config_write(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 val)
+{
+ int ret;
+
+ ret = vfio_user_config_write(vdev->pdev, pos, val, count);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static int vfio_raw_config_read(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 *val)
+{
+ int ret;
+
+ ret = vfio_user_config_read(vdev->pdev, pos, val, count);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ return count;
+}
+
+/* Default capability regions to read-only, no-virtualization */
+static struct perm_bits cap_perms[PCI_CAP_ID_MAX + 1] = {
+ [0 ... PCI_CAP_ID_MAX] = { .readfn = vfio_direct_config_read }
+};
+static struct perm_bits ecap_perms[PCI_EXT_CAP_ID_MAX + 1] = {
+ [0 ... PCI_EXT_CAP_ID_MAX] = { .readfn = vfio_direct_config_read }
+};
+/*
+ * Default unassigned regions to raw read-write access. Some devices
+ * require this to function as they hide registers between the gaps in
+ * config space (be2net). Like MMIO and I/O port registers, we have
+ * to trust the hardware isolation.
+ */
+static struct perm_bits unassigned_perms = {
+ .readfn = vfio_raw_config_read,
+ .writefn = vfio_raw_config_write
+};
+
+static void free_perm_bits(struct perm_bits *perm)
+{
+ kfree(perm->virt);
+ kfree(perm->write);
+ perm->virt = NULL;
+ perm->write = NULL;
+}
+
+static int alloc_perm_bits(struct perm_bits *perm, int size)
+{
+ /*
+ * Round up all permission bits to the next dword, this lets us
+ * ignore whether a read/write exceeds the defined capability
+ * structure. We can do this because:
+ * - Standard config space is already dword aligned
+ * - Capabilities are all dword alinged (bits 0:1 of next reserved)
+ * - Express capabilities defined as dword aligned
+ */
+ size = round_up(size, 4);
+
+ /*
+ * Zero state is
+ * - All Readable, None Writeable, None Virtualized
+ */
+ perm->virt = kzalloc(size, GFP_KERNEL);
+ perm->write = kzalloc(size, GFP_KERNEL);
+ if (!perm->virt || !perm->write) {
+ free_perm_bits(perm);
+ return -ENOMEM;
+ }
+
+ perm->readfn = vfio_default_config_read;
+ perm->writefn = vfio_default_config_write;
+
+ return 0;
+}
+
+/*
+ * Helper functions for filling in permission tables
+ */
+static inline void p_setb(struct perm_bits *p, int off, u8 virt, u8 write)
+{
+ p->virt[off] = virt;
+ p->write[off] = write;
+}
+
+/* Handle endian-ness - pci and tables are little-endian */
+static inline void p_setw(struct perm_bits *p, int off, u16 virt, u16 write)
+{
+ *(__le16 *)(&p->virt[off]) = cpu_to_le16(virt);
+ *(__le16 *)(&p->write[off]) = cpu_to_le16(write);
+}
+
+/* Handle endian-ness - pci and tables are little-endian */
+static inline void p_setd(struct perm_bits *p, int off, u32 virt, u32 write)
+{
+ *(__le32 *)(&p->virt[off]) = cpu_to_le32(virt);
+ *(__le32 *)(&p->write[off]) = cpu_to_le32(write);
+}
+
+/*
+ * Restore the *real* BARs after we detect a FLR or backdoor reset.
+ * (backdoor = some device specific technique that we didn't catch)
+ */
+static void vfio_bar_restore(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ u32 *rbar = vdev->rbar;
+ int i;
+
+ if (pdev->is_virtfn)
+ return;
+
+ pr_info("%s: %s reset recovery - restoring bars\n",
+ __func__, dev_name(&pdev->dev));
+
+ for (i = PCI_BASE_ADDRESS_0; i <= PCI_BASE_ADDRESS_5; i += 4, rbar++)
+ pci_user_write_config_dword(pdev, i, *rbar);
+
+ pci_user_write_config_dword(pdev, PCI_ROM_ADDRESS, *rbar);
+}
+
+static __le32 vfio_generate_bar_flags(struct pci_dev *pdev, int bar)
+{
+ unsigned long flags = pci_resource_flags(pdev, bar);
+ u32 val;
+
+ if (flags & IORESOURCE_IO)
+ return cpu_to_le32(PCI_BASE_ADDRESS_SPACE_IO);
+
+ val = PCI_BASE_ADDRESS_SPACE_MEMORY;
+
+ if (flags & IORESOURCE_PREFETCH)
+ val |= PCI_BASE_ADDRESS_MEM_PREFETCH;
+
+ if (flags & IORESOURCE_MEM_64)
+ val |= PCI_BASE_ADDRESS_MEM_TYPE_64;
+
+ return cpu_to_le32(val);
+}
+
+/*
+ * Pretend we're hardware and tweak the values of the *virtual* PCI BARs
+ * to reflect the hardware capabilities. This implements BAR sizing.
+ */
+static void vfio_bar_fixup(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int i;
+ __le32 *bar;
+ u64 mask;
+
+ bar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
+
+ for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++, bar++) {
+ if (!pci_resource_start(pdev, i)) {
+ *bar = 0; /* Unmapped by host = unimplemented to user */
+ continue;
+ }
+
+ mask = ~(pci_resource_len(pdev, i) - 1);
+
+ *bar &= cpu_to_le32((u32)mask);
+ *bar |= vfio_generate_bar_flags(pdev, i);
+
+ if (*bar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) {
+ bar++;
+ *bar &= cpu_to_le32((u32)(mask >> 32));
+ i++;
+ }
+ }
+
+ bar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS];
+
+ /*
+ * NB. we expose the actual BAR size here, regardless of whether
+ * we can read it. When we report the REGION_INFO for the ROM
+ * we report what PCI tells us is the actual ROM size.
+ */
+ if (pci_resource_start(pdev, PCI_ROM_RESOURCE)) {
+ mask = ~(pci_resource_len(pdev, PCI_ROM_RESOURCE) - 1);
+ mask |= PCI_ROM_ADDRESS_ENABLE;
+ *bar &= cpu_to_le32((u32)mask);
+ } else
+ *bar = 0;
+
+ vdev->bardirty = false;
+}
+
+static int vfio_basic_config_read(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 *val)
+{
+ if (is_bar(offset)) /* pos == offset for basic config */
+ vfio_bar_fixup(vdev);
+
+ count = vfio_default_config_read(vdev, pos, count, perm, offset, val);
+
+ /* Mask in virtual memory enable for SR-IOV devices */
+ if (offset == PCI_COMMAND && vdev->pdev->is_virtfn) {
+ u16 cmd = le16_to_cpu(*(__le16 *)&vdev->vconfig[PCI_COMMAND]);
+ u32 tmp_val = le32_to_cpu(*val);
+
+ tmp_val |= cmd & PCI_COMMAND_MEMORY;
+ *val = cpu_to_le32(tmp_val);
+ }
+
+ return count;
+}
+
+static int vfio_basic_config_write(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 val)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ __le16 *virt_cmd;
+ u16 new_cmd = 0;
+ int ret;
+
+ virt_cmd = (__le16 *)&vdev->vconfig[PCI_COMMAND];
+
+ if (offset == PCI_COMMAND) {
+ bool phys_mem, virt_mem, new_mem, phys_io, virt_io, new_io;
+ u16 phys_cmd;
+
+ ret = pci_user_read_config_word(pdev, PCI_COMMAND, &phys_cmd);
+ if (ret)
+ return ret;
+
+ new_cmd = le32_to_cpu(val);
+
+ phys_mem = !!(phys_cmd & PCI_COMMAND_MEMORY);
+ virt_mem = !!(le16_to_cpu(*virt_cmd) & PCI_COMMAND_MEMORY);
+ new_mem = !!(new_cmd & PCI_COMMAND_MEMORY);
+
+ phys_io = !!(phys_cmd & PCI_COMMAND_IO);
+ virt_io = !!(le16_to_cpu(*virt_cmd) & PCI_COMMAND_IO);
+ new_io = !!(new_cmd & PCI_COMMAND_IO);
+
+ /*
+ * If the user is writing mem/io enable (new_mem/io) and we
+ * think it's already enabled (virt_mem/io), but the hardware
+ * shows it disabled (phys_mem/io, then the device has
+ * undergone some kind of backdoor reset and needs to be
+ * restored before we allow it to enable the bars.
+ * SR-IOV devices will trigger this, but we catch them later
+ */
+ if ((new_mem && virt_mem && !phys_mem) ||
+ (new_io && virt_io && !phys_io))
+ vfio_bar_restore(vdev);
+ }
+
+ count = vfio_default_config_write(vdev, pos, count, perm, offset, val);
+ if (count < 0)
+ return count;
+
+ /*
+ * Save current memory/io enable bits in vconfig to allow for
+ * the test above next time.
+ */
+ if (offset == PCI_COMMAND) {
+ u16 mask = PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
+
+ *virt_cmd &= cpu_to_le16(~mask);
+ *virt_cmd |= cpu_to_le16(new_cmd & mask);
+ }
+
+ /* Emulate INTx disable */
+ if (offset >= PCI_COMMAND && offset <= PCI_COMMAND + 1) {
+ bool virt_intx_disable;
+
+ virt_intx_disable = !!(le16_to_cpu(*virt_cmd) &
+ PCI_COMMAND_INTX_DISABLE);
+
+ if (virt_intx_disable && !vdev->virq_disabled) {
+ vdev->virq_disabled = true;
+ vfio_pci_intx_mask(vdev);
+ } else if (!virt_intx_disable && vdev->virq_disabled) {
+ vdev->virq_disabled = false;
+ vfio_pci_intx_unmask(vdev);
+ }
+ }
+
+ if (is_bar(offset))
+ vdev->bardirty = true;
+
+ return count;
+}
+
+/* Permissions for the Basic PCI Header */
+static int __init init_pci_cap_basic_perm(struct perm_bits *perm)
+{
+ if (alloc_perm_bits(perm, PCI_STD_HEADER_SIZEOF))
+ return -ENOMEM;
+
+ perm->readfn = vfio_basic_config_read;
+ perm->writefn = vfio_basic_config_write;
+
+ /* Virtualized for SR-IOV functions, which just have FFFF */
+ p_setw(perm, PCI_VENDOR_ID, (u16)ALL_VIRT, NO_WRITE);
+ p_setw(perm, PCI_DEVICE_ID, (u16)ALL_VIRT, NO_WRITE);
+
+ /*
+ * Virtualize INTx disable, we use it internally for interrupt
+ * control and can emulate it for non-PCI 2.3 devices.
+ */
+ p_setw(perm, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE, (u16)ALL_WRITE);
+
+ /* Virtualize capability list, we might want to skip/disable */
+ p_setw(perm, PCI_STATUS, PCI_STATUS_CAP_LIST, NO_WRITE);
+
+ /* No harm to write */
+ p_setb(perm, PCI_CACHE_LINE_SIZE, NO_VIRT, (u8)ALL_WRITE);
+ p_setb(perm, PCI_LATENCY_TIMER, NO_VIRT, (u8)ALL_WRITE);
+ p_setb(perm, PCI_BIST, NO_VIRT, (u8)ALL_WRITE);
+
+ /* Virtualize all bars, can't touch the real ones */
+ p_setd(perm, PCI_BASE_ADDRESS_0, ALL_VIRT, ALL_WRITE);
+ p_setd(perm, PCI_BASE_ADDRESS_1, ALL_VIRT, ALL_WRITE);
+ p_setd(perm, PCI_BASE_ADDRESS_2, ALL_VIRT, ALL_WRITE);
+ p_setd(perm, PCI_BASE_ADDRESS_3, ALL_VIRT, ALL_WRITE);
+ p_setd(perm, PCI_BASE_ADDRESS_4, ALL_VIRT, ALL_WRITE);
+ p_setd(perm, PCI_BASE_ADDRESS_5, ALL_VIRT, ALL_WRITE);
+ p_setd(perm, PCI_ROM_ADDRESS, ALL_VIRT, ALL_WRITE);
+
+ /* Allow us to adjust capability chain */
+ p_setb(perm, PCI_CAPABILITY_LIST, (u8)ALL_VIRT, NO_WRITE);
+
+ /* Sometimes used by sw, just virtualize */
+ p_setb(perm, PCI_INTERRUPT_LINE, (u8)ALL_VIRT, (u8)ALL_WRITE);
+
+ /* Virtualize interrupt pin to allow hiding INTx */
+ p_setb(perm, PCI_INTERRUPT_PIN, (u8)ALL_VIRT, (u8)NO_WRITE);
+
+ return 0;
+}
+
+static int vfio_pm_config_write(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 val)
+{
+ count = vfio_default_config_write(vdev, pos, count, perm, offset, val);
+ if (count < 0)
+ return count;
+
+ if (offset == PCI_PM_CTRL) {
+ pci_power_t state;
+
+ switch (le32_to_cpu(val) & PCI_PM_CTRL_STATE_MASK) {
+ case 0:
+ state = PCI_D0;
+ break;
+ case 1:
+ state = PCI_D1;
+ break;
+ case 2:
+ state = PCI_D2;
+ break;
+ case 3:
+ state = PCI_D3hot;
+ break;
+ }
+
+ pci_set_power_state(vdev->pdev, state);
+ }
+
+ return count;
+}
+
+/* Permissions for the Power Management capability */
+static int __init init_pci_cap_pm_perm(struct perm_bits *perm)
+{
+ if (alloc_perm_bits(perm, pci_cap_length[PCI_CAP_ID_PM]))
+ return -ENOMEM;
+
+ perm->writefn = vfio_pm_config_write;
+
+ /*
+ * We always virtualize the next field so we can remove
+ * capabilities from the chain if we want to.
+ */
+ p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE);
+
+ /*
+ * Power management is defined *per function*, so we can let
+ * the user change power state, but we trap and initiate the
+ * change ourselves, so the state bits are read-only.
+ */
+ p_setd(perm, PCI_PM_CTRL, NO_VIRT, ~PCI_PM_CTRL_STATE_MASK);
+ return 0;
+}
+
+/* Permissions for PCI-X capability */
+static int __init init_pci_cap_pcix_perm(struct perm_bits *perm)
+{
+ /* Alloc 24, but only 8 are used in v0 */
+ if (alloc_perm_bits(perm, PCI_CAP_PCIX_SIZEOF_V2))
+ return -ENOMEM;
+
+ p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE);
+
+ p_setw(perm, PCI_X_CMD, NO_VIRT, (u16)ALL_WRITE);
+ p_setd(perm, PCI_X_ECC_CSR, NO_VIRT, ALL_WRITE);
+ return 0;
+}
+
+/* Permissions for PCI Express capability */
+static int __init init_pci_cap_exp_perm(struct perm_bits *perm)
+{
+ /* Alloc larger of two possible sizes */
+ if (alloc_perm_bits(perm, PCI_CAP_EXP_ENDPOINT_SIZEOF_V2))
+ return -ENOMEM;
+
+ p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE);
+
+ /*
+ * Allow writes to device control fields (includes FLR!)
+ * but not to devctl_phantom which could confuse IOMMU
+ * or to the ARI bit in devctl2 which is set at probe time
+ */
+ p_setw(perm, PCI_EXP_DEVCTL, NO_VIRT, ~PCI_EXP_DEVCTL_PHANTOM);
+ p_setw(perm, PCI_EXP_DEVCTL2, NO_VIRT, ~PCI_EXP_DEVCTL2_ARI);
+ return 0;
+}
+
+/* Permissions for Advanced Function capability */
+static int __init init_pci_cap_af_perm(struct perm_bits *perm)
+{
+ if (alloc_perm_bits(perm, pci_cap_length[PCI_CAP_ID_AF]))
+ return -ENOMEM;
+
+ p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE);
+ p_setb(perm, PCI_AF_CTRL, NO_VIRT, PCI_AF_CTRL_FLR);
+ return 0;
+}
+
+/* Permissions for Advanced Error Reporting extended capability */
+static int __init init_pci_ext_cap_err_perm(struct perm_bits *perm)
+{
+ u32 mask;
+
+ if (alloc_perm_bits(perm, pci_ext_cap_length[PCI_EXT_CAP_ID_ERR]))
+ return -ENOMEM;
+
+ /*
+ * Virtualize the first dword of all express capabilities
+ * because it includes the next pointer. This lets us later
+ * remove capabilities from the chain if we need to.
+ */
+ p_setd(perm, 0, ALL_VIRT, NO_WRITE);
+
+ /* Writable bits mask */
+ mask = PCI_ERR_UNC_UND | /* Undefined */
+ PCI_ERR_UNC_DLP | /* Data Link Protocol */
+ PCI_ERR_UNC_SURPDN | /* Surprise Down */
+ PCI_ERR_UNC_POISON_TLP | /* Poisoned TLP */
+ PCI_ERR_UNC_FCP | /* Flow Control Protocol */
+ PCI_ERR_UNC_COMP_TIME | /* Completion Timeout */
+ PCI_ERR_UNC_COMP_ABORT | /* Completer Abort */
+ PCI_ERR_UNC_UNX_COMP | /* Unexpected Completion */
+ PCI_ERR_UNC_RX_OVER | /* Receiver Overflow */
+ PCI_ERR_UNC_MALF_TLP | /* Malformed TLP */
+ PCI_ERR_UNC_ECRC | /* ECRC Error Status */
+ PCI_ERR_UNC_UNSUP | /* Unsupported Request */
+ PCI_ERR_UNC_ACSV | /* ACS Violation */
+ PCI_ERR_UNC_INTN | /* internal error */
+ PCI_ERR_UNC_MCBTLP | /* MC blocked TLP */
+ PCI_ERR_UNC_ATOMEG | /* Atomic egress blocked */
+ PCI_ERR_UNC_TLPPRE; /* TLP prefix blocked */
+ p_setd(perm, PCI_ERR_UNCOR_STATUS, NO_VIRT, mask);
+ p_setd(perm, PCI_ERR_UNCOR_MASK, NO_VIRT, mask);
+ p_setd(perm, PCI_ERR_UNCOR_SEVER, NO_VIRT, mask);
+
+ mask = PCI_ERR_COR_RCVR | /* Receiver Error Status */
+ PCI_ERR_COR_BAD_TLP | /* Bad TLP Status */
+ PCI_ERR_COR_BAD_DLLP | /* Bad DLLP Status */
+ PCI_ERR_COR_REP_ROLL | /* REPLAY_NUM Rollover */
+ PCI_ERR_COR_REP_TIMER | /* Replay Timer Timeout */
+ PCI_ERR_COR_ADV_NFAT | /* Advisory Non-Fatal */
+ PCI_ERR_COR_INTERNAL | /* Corrected Internal */
+ PCI_ERR_COR_LOG_OVER; /* Header Log Overflow */
+ p_setd(perm, PCI_ERR_COR_STATUS, NO_VIRT, mask);
+ p_setd(perm, PCI_ERR_COR_MASK, NO_VIRT, mask);
+
+ mask = PCI_ERR_CAP_ECRC_GENE | /* ECRC Generation Enable */
+ PCI_ERR_CAP_ECRC_CHKE; /* ECRC Check Enable */
+ p_setd(perm, PCI_ERR_CAP, NO_VIRT, mask);
+ return 0;
+}
+
+/* Permissions for Power Budgeting extended capability */
+static int __init init_pci_ext_cap_pwr_perm(struct perm_bits *perm)
+{
+ if (alloc_perm_bits(perm, pci_ext_cap_length[PCI_EXT_CAP_ID_PWR]))
+ return -ENOMEM;
+
+ p_setd(perm, 0, ALL_VIRT, NO_WRITE);
+
+ /* Writing the data selector is OK, the info is still read-only */
+ p_setb(perm, PCI_PWR_DATA, NO_VIRT, (u8)ALL_WRITE);
+ return 0;
+}
+
+/*
+ * Initialize the shared permission tables
+ */
+void vfio_pci_uninit_perm_bits(void)
+{
+ free_perm_bits(&cap_perms[PCI_CAP_ID_BASIC]);
+
+ free_perm_bits(&cap_perms[PCI_CAP_ID_PM]);
+ free_perm_bits(&cap_perms[PCI_CAP_ID_PCIX]);
+ free_perm_bits(&cap_perms[PCI_CAP_ID_EXP]);
+ free_perm_bits(&cap_perms[PCI_CAP_ID_AF]);
+
+ free_perm_bits(&ecap_perms[PCI_EXT_CAP_ID_ERR]);
+ free_perm_bits(&ecap_perms[PCI_EXT_CAP_ID_PWR]);
+}
+
+int __init vfio_pci_init_perm_bits(void)
+{
+ int ret;
+
+ /* Basic config space */
+ ret = init_pci_cap_basic_perm(&cap_perms[PCI_CAP_ID_BASIC]);
+
+ /* Capabilities */
+ ret |= init_pci_cap_pm_perm(&cap_perms[PCI_CAP_ID_PM]);
+ cap_perms[PCI_CAP_ID_VPD].writefn = vfio_raw_config_write;
+ ret |= init_pci_cap_pcix_perm(&cap_perms[PCI_CAP_ID_PCIX]);
+ cap_perms[PCI_CAP_ID_VNDR].writefn = vfio_raw_config_write;
+ ret |= init_pci_cap_exp_perm(&cap_perms[PCI_CAP_ID_EXP]);
+ ret |= init_pci_cap_af_perm(&cap_perms[PCI_CAP_ID_AF]);
+
+ /* Extended capabilities */
+ ret |= init_pci_ext_cap_err_perm(&ecap_perms[PCI_EXT_CAP_ID_ERR]);
+ ret |= init_pci_ext_cap_pwr_perm(&ecap_perms[PCI_EXT_CAP_ID_PWR]);
+ ecap_perms[PCI_EXT_CAP_ID_VNDR].writefn = vfio_raw_config_write;
+
+ if (ret)
+ vfio_pci_uninit_perm_bits();
+
+ return ret;
+}
+
+static int vfio_find_cap_start(struct vfio_pci_device *vdev, int pos)
+{
+ u8 cap;
+ int base = (pos >= PCI_CFG_SPACE_SIZE) ? PCI_CFG_SPACE_SIZE :
+ PCI_STD_HEADER_SIZEOF;
+ cap = vdev->pci_config_map[pos];
+
+ if (cap == PCI_CAP_ID_BASIC)
+ return 0;
+
+ /* XXX Can we have to abutting capabilities of the same type? */
+ while (pos - 1 >= base && vdev->pci_config_map[pos - 1] == cap)
+ pos--;
+
+ return pos;
+}
+
+static int vfio_msi_config_read(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 *val)
+{
+ /* Update max available queue size from msi_qmax */
+ if (offset <= PCI_MSI_FLAGS && offset + count >= PCI_MSI_FLAGS) {
+ __le16 *flags;
+ int start;
+
+ start = vfio_find_cap_start(vdev, pos);
+
+ flags = (__le16 *)&vdev->vconfig[start];
+
+ *flags &= cpu_to_le16(~PCI_MSI_FLAGS_QMASK);
+ *flags |= cpu_to_le16(vdev->msi_qmax << 1);
+ }
+
+ return vfio_default_config_read(vdev, pos, count, perm, offset, val);
+}
+
+static int vfio_msi_config_write(struct vfio_pci_device *vdev, int pos,
+ int count, struct perm_bits *perm,
+ int offset, __le32 val)
+{
+ count = vfio_default_config_write(vdev, pos, count, perm, offset, val);
+ if (count < 0)
+ return count;
+
+ /* Fixup and write configured queue size and enable to hardware */
+ if (offset <= PCI_MSI_FLAGS && offset + count >= PCI_MSI_FLAGS) {
+ __le16 *pflags;
+ u16 flags;
+ int start, ret;
+
+ start = vfio_find_cap_start(vdev, pos);
+
+ pflags = (__le16 *)&vdev->vconfig[start + PCI_MSI_FLAGS];
+
+ flags = le16_to_cpu(*pflags);
+
+ /* MSI is enabled via ioctl */
+ if (!is_msi(vdev))
+ flags &= ~PCI_MSI_FLAGS_ENABLE;
+
+ /* Check queue size */
+ if ((flags & PCI_MSI_FLAGS_QSIZE) >> 4 > vdev->msi_qmax) {
+ flags &= ~PCI_MSI_FLAGS_QSIZE;
+ flags |= vdev->msi_qmax << 4;
+ }
+
+ /* Write back to virt and to hardware */
+ *pflags = cpu_to_le16(flags);
+ ret = pci_user_write_config_word(vdev->pdev,
+ start + PCI_MSI_FLAGS,
+ flags);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+ }
+
+ return count;
+}
+
+/*
+ * MSI determination is per-device, so this routine gets used beyond
+ * initialization time. Don't add __init
+ */
+static int init_pci_cap_msi_perm(struct perm_bits *perm, int len, u16 flags)
+{
+ if (alloc_perm_bits(perm, len))
+ return -ENOMEM;
+
+ perm->readfn = vfio_msi_config_read;
+ perm->writefn = vfio_msi_config_write;
+
+ p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE);
+
+ /*
+ * The upper byte of the control register is reserved,
+ * just setup the lower byte.
+ */
+ p_setb(perm, PCI_MSI_FLAGS, (u8)ALL_VIRT, (u8)ALL_WRITE);
+ p_setd(perm, PCI_MSI_ADDRESS_LO, ALL_VIRT, ALL_WRITE);
+ if (flags & PCI_MSI_FLAGS_64BIT) {
+ p_setd(perm, PCI_MSI_ADDRESS_HI, ALL_VIRT, ALL_WRITE);
+ p_setw(perm, PCI_MSI_DATA_64, (u16)ALL_VIRT, (u16)ALL_WRITE);
+ if (flags & PCI_MSI_FLAGS_MASKBIT) {
+ p_setd(perm, PCI_MSI_MASK_64, NO_VIRT, ALL_WRITE);
+ p_setd(perm, PCI_MSI_PENDING_64, NO_VIRT, ALL_WRITE);
+ }
+ } else {
+ p_setw(perm, PCI_MSI_DATA_32, (u16)ALL_VIRT, (u16)ALL_WRITE);
+ if (flags & PCI_MSI_FLAGS_MASKBIT) {
+ p_setd(perm, PCI_MSI_MASK_32, NO_VIRT, ALL_WRITE);
+ p_setd(perm, PCI_MSI_PENDING_32, NO_VIRT, ALL_WRITE);
+ }
+ }
+ return 0;
+}
+
+/* Determine MSI CAP field length; initialize msi_perms on 1st call per vdev */
+static int vfio_msi_cap_len(struct vfio_pci_device *vdev, u8 pos)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int len, ret;
+ u16 flags;
+
+ ret = pci_read_config_word(pdev, pos + PCI_MSI_FLAGS, &flags);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ len = 10; /* Minimum size */
+ if (flags & PCI_MSI_FLAGS_64BIT)
+ len += 4;
+ if (flags & PCI_MSI_FLAGS_MASKBIT)
+ len += 10;
+
+ if (vdev->msi_perm)
+ return len;
+
+ vdev->msi_perm = kmalloc(sizeof(struct perm_bits), GFP_KERNEL);
+ if (!vdev->msi_perm)
+ return -ENOMEM;
+
+ ret = init_pci_cap_msi_perm(vdev->msi_perm, len, flags);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+/* Determine extended capability length for VC (2 & 9) and MFVC */
+static int vfio_vc_cap_len(struct vfio_pci_device *vdev, u16 pos)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ u32 tmp;
+ int ret, evcc, phases, vc_arb;
+ int len = PCI_CAP_VC_BASE_SIZEOF;
+
+ ret = pci_read_config_dword(pdev, pos + PCI_VC_PORT_CAP1, &tmp);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ evcc = tmp & PCI_VC_CAP1_EVCC; /* extended vc count */
+ ret = pci_read_config_dword(pdev, pos + PCI_VC_PORT_CAP2, &tmp);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ if (tmp & PCI_VC_CAP2_128_PHASE)
+ phases = 128;
+ else if (tmp & PCI_VC_CAP2_64_PHASE)
+ phases = 64;
+ else if (tmp & PCI_VC_CAP2_32_PHASE)
+ phases = 32;
+ else
+ phases = 0;
+
+ vc_arb = phases * 4;
+
+ /*
+ * Port arbitration tables are root & switch only;
+ * function arbitration tables are function 0 only.
+ * In either case, we'll never let user write them so
+ * we don't care how big they are
+ */
+ len += (1 + evcc) * PCI_CAP_VC_PER_VC_SIZEOF;
+ if (vc_arb) {
+ len = round_up(len, 16);
+ len += vc_arb / 8;
+ }
+ return len;
+}
+
+static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ u32 dword;
+ u16 word;
+ u8 byte;
+ int ret;
+
+ switch (cap) {
+ case PCI_CAP_ID_MSI:
+ return vfio_msi_cap_len(vdev, pos);
+ case PCI_CAP_ID_PCIX:
+ ret = pci_read_config_word(pdev, pos + PCI_X_CMD, &word);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ if (PCI_X_CMD_VERSION(word)) {
+ /* Test for extended capabilities */
+ pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &dword);
+ vdev->extended_caps = (dword != 0);
+ return PCI_CAP_PCIX_SIZEOF_V2;
+ } else
+ return PCI_CAP_PCIX_SIZEOF_V0;
+ case PCI_CAP_ID_VNDR:
+ /* length follows next field */
+ ret = pci_read_config_byte(pdev, pos + PCI_CAP_FLAGS, &byte);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ return byte;
+ case PCI_CAP_ID_EXP:
+ /* Test for extended capabilities */
+ pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &dword);
+ vdev->extended_caps = (dword != 0);
+
+ /* length based on version */
+ if ((pcie_caps_reg(pdev) & PCI_EXP_FLAGS_VERS) == 1)
+ return PCI_CAP_EXP_ENDPOINT_SIZEOF_V1;
+ else
+ return PCI_CAP_EXP_ENDPOINT_SIZEOF_V2;
+ case PCI_CAP_ID_HT:
+ ret = pci_read_config_byte(pdev, pos + 3, &byte);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ return (byte & HT_3BIT_CAP_MASK) ?
+ HT_CAP_SIZEOF_SHORT : HT_CAP_SIZEOF_LONG;
+ case PCI_CAP_ID_SATA:
+ ret = pci_read_config_byte(pdev, pos + PCI_SATA_REGS, &byte);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ byte &= PCI_SATA_REGS_MASK;
+ if (byte == PCI_SATA_REGS_INLINE)
+ return PCI_SATA_SIZEOF_LONG;
+ else
+ return PCI_SATA_SIZEOF_SHORT;
+ default:
+ pr_warn("%s: %s unknown length for pci cap 0x%x@0x%x\n",
+ dev_name(&pdev->dev), __func__, cap, pos);
+ }
+
+ return 0;
+}
+
+static int vfio_ext_cap_len(struct vfio_pci_device *vdev, u16 ecap, u16 epos)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ u8 byte;
+ u32 dword;
+ int ret;
+
+ switch (ecap) {
+ case PCI_EXT_CAP_ID_VNDR:
+ ret = pci_read_config_dword(pdev, epos + PCI_VSEC_HDR, &dword);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ return dword >> PCI_VSEC_HDR_LEN_SHIFT;
+ case PCI_EXT_CAP_ID_VC:
+ case PCI_EXT_CAP_ID_VC9:
+ case PCI_EXT_CAP_ID_MFVC:
+ return vfio_vc_cap_len(vdev, epos);
+ case PCI_EXT_CAP_ID_ACS:
+ ret = pci_read_config_byte(pdev, epos + PCI_ACS_CAP, &byte);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ if (byte & PCI_ACS_EC) {
+ int bits;
+
+ ret = pci_read_config_byte(pdev,
+ epos + PCI_ACS_EGRESS_BITS,
+ &byte);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ bits = byte ? round_up(byte, 32) : 256;
+ return 8 + (bits / 8);
+ }
+ return 8;
+
+ case PCI_EXT_CAP_ID_REBAR:
+ ret = pci_read_config_byte(pdev, epos + PCI_REBAR_CTRL, &byte);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ byte &= PCI_REBAR_CTRL_NBAR_MASK;
+ byte >>= PCI_REBAR_CTRL_NBAR_SHIFT;
+
+ return 4 + (byte * 8);
+ case PCI_EXT_CAP_ID_DPA:
+ ret = pci_read_config_byte(pdev, epos + PCI_DPA_CAP, &byte);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ byte &= PCI_DPA_CAP_SUBSTATE_MASK;
+ return PCI_DPA_BASE_SIZEOF + byte + 1;
+ case PCI_EXT_CAP_ID_TPH:
+ ret = pci_read_config_dword(pdev, epos + PCI_TPH_CAP, &dword);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ if ((dword & PCI_TPH_CAP_LOC_MASK) == PCI_TPH_LOC_CAP) {
+ int sts;
+
+ sts = dword & PCI_TPH_CAP_ST_MASK;
+ sts >>= PCI_TPH_CAP_ST_SHIFT;
+ return PCI_TPH_BASE_SIZEOF + (sts * 2) + 2;
+ }
+ return PCI_TPH_BASE_SIZEOF;
+ default:
+ pr_warn("%s: %s unknown length for pci ecap 0x%x@0x%x\n",
+ dev_name(&pdev->dev), __func__, ecap, epos);
+ }
+
+ return 0;
+}
+
+static int vfio_fill_vconfig_bytes(struct vfio_pci_device *vdev,
+ int offset, int size)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int ret = 0;
+
+ /*
+ * We try to read physical config space in the largest chunks
+ * we can, assuming that all of the fields support dword access.
+ * pci_save_state() makes this same assumption and seems to do ok.
+ */
+ while (size) {
+ int filled;
+
+ if (size >= 4 && !(offset % 4)) {
+ __le32 *dwordp = (__le32 *)&vdev->vconfig[offset];
+ u32 dword;
+
+ ret = pci_read_config_dword(pdev, offset, &dword);
+ if (ret)
+ return ret;
+ *dwordp = cpu_to_le32(dword);
+ filled = 4;
+ } else if (size >= 2 && !(offset % 2)) {
+ __le16 *wordp = (__le16 *)&vdev->vconfig[offset];
+ u16 word;
+
+ ret = pci_read_config_word(pdev, offset, &word);
+ if (ret)
+ return ret;
+ *wordp = cpu_to_le16(word);
+ filled = 2;
+ } else {
+ u8 *byte = &vdev->vconfig[offset];
+ ret = pci_read_config_byte(pdev, offset, byte);
+ if (ret)
+ return ret;
+ filled = 1;
+ }
+
+ offset += filled;
+ size -= filled;
+ }
+
+ return ret;
+}
+
+static int vfio_cap_init(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ u8 *map = vdev->pci_config_map;
+ u16 status;
+ u8 pos, *prev, cap;
+ int loops, ret, caps = 0;
+
+ /* Any capabilities? */
+ ret = pci_read_config_word(pdev, PCI_STATUS, &status);
+ if (ret)
+ return ret;
+
+ if (!(status & PCI_STATUS_CAP_LIST))
+ return 0; /* Done */
+
+ ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos);
+ if (ret)
+ return ret;
+
+ /* Mark the previous position in case we want to skip a capability */
+ prev = &vdev->vconfig[PCI_CAPABILITY_LIST];
+
+ /* We can bound our loop, capabilities are dword aligned */
+ loops = (PCI_CFG_SPACE_SIZE - PCI_STD_HEADER_SIZEOF) / PCI_CAP_SIZEOF;
+ while (pos && loops--) {
+ u8 next;
+ int i, len = 0;
+
+ ret = pci_read_config_byte(pdev, pos, &cap);
+ if (ret)
+ return ret;
+
+ ret = pci_read_config_byte(pdev,
+ pos + PCI_CAP_LIST_NEXT, &next);
+ if (ret)
+ return ret;
+
+ if (cap <= PCI_CAP_ID_MAX) {
+ len = pci_cap_length[cap];
+ if (len == 0xFF) { /* Variable length */
+ len = vfio_cap_len(vdev, cap, pos);
+ if (len < 0)
+ return len;
+ }
+ }
+
+ if (!len) {
+ pr_info("%s: %s hiding cap 0x%x\n",
+ __func__, dev_name(&pdev->dev), cap);
+ *prev = next;
+ pos = next;
+ continue;
+ }
+
+ /* Sanity check, do we overlap other capabilities? */
+ for (i = 0; i < len; i++) {
+ if (likely(map[pos + i] == PCI_CAP_ID_INVALID))
+ continue;
+
+ pr_warn("%s: %s pci config conflict @0x%x, was cap 0x%x now cap 0x%x\n",
+ __func__, dev_name(&pdev->dev),
+ pos + i, map[pos + i], cap);
+ }
+
+ memset(map + pos, cap, len);
+ ret = vfio_fill_vconfig_bytes(vdev, pos, len);
+ if (ret)
+ return ret;
+
+ prev = &vdev->vconfig[pos + PCI_CAP_LIST_NEXT];
+ pos = next;
+ caps++;
+ }
+
+ /* If we didn't fill any capabilities, clear the status flag */
+ if (!caps) {
+ __le16 *vstatus = (__le16 *)&vdev->vconfig[PCI_STATUS];
+ *vstatus &= ~cpu_to_le16(PCI_STATUS_CAP_LIST);
+ }
+
+ return 0;
+}
+
+static int vfio_ecap_init(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ u8 *map = vdev->pci_config_map;
+ u16 epos;
+ __le32 *prev = NULL;
+ int loops, ret, ecaps = 0;
+
+ if (!vdev->extended_caps)
+ return 0;
+
+ epos = PCI_CFG_SPACE_SIZE;
+
+ loops = (pdev->cfg_size - PCI_CFG_SPACE_SIZE) / PCI_CAP_SIZEOF;
+
+ while (loops-- && epos >= PCI_CFG_SPACE_SIZE) {
+ u32 header;
+ u16 ecap;
+ int i, len = 0;
+ bool hidden = false;
+
+ ret = pci_read_config_dword(pdev, epos, &header);
+ if (ret)
+ return ret;
+
+ ecap = PCI_EXT_CAP_ID(header);
+
+ if (ecap <= PCI_EXT_CAP_ID_MAX) {
+ len = pci_ext_cap_length[ecap];
+ if (len == 0xFF) {
+ len = vfio_ext_cap_len(vdev, ecap, epos);
+ if (len < 0)
+ return ret;
+ }
+ }
+
+ if (!len) {
+ pr_info("%s: %s hiding ecap 0x%x@0x%x\n",
+ __func__, dev_name(&pdev->dev), ecap, epos);
+
+ /* If not the first in the chain, we can skip over it */
+ if (prev) {
+ u32 val = epos = PCI_EXT_CAP_NEXT(header);
+ *prev &= cpu_to_le32(~(0xffcU << 20));
+ *prev |= cpu_to_le32(val << 20);
+ continue;
+ }
+
+ /*
+ * Otherwise, fill in a placeholder, the direct
+ * readfn will virtualize this automatically
+ */
+ len = PCI_CAP_SIZEOF;
+ hidden = true;
+ }
+
+ for (i = 0; i < len; i++) {
+ if (likely(map[epos + i] == PCI_CAP_ID_INVALID))
+ continue;
+
+ pr_warn("%s: %s pci config conflict @0x%x, was ecap 0x%x now ecap 0x%x\n",
+ __func__, dev_name(&pdev->dev),
+ epos + i, map[epos + i], ecap);
+ }
+
+ /*
+ * Even though ecap is 2 bytes, we're currently a long way
+ * from exceeding 1 byte capabilities. If we ever make it
+ * up to 0xFF we'll need to up this to a two-byte, byte map.
+ */
+ BUILD_BUG_ON(PCI_EXT_CAP_ID_MAX >= PCI_CAP_ID_INVALID);
+
+ memset(map + epos, ecap, len);
+ ret = vfio_fill_vconfig_bytes(vdev, epos, len);
+ if (ret)
+ return ret;
+
+ /*
+ * If we're just using this capability to anchor the list,
+ * hide the real ID. Only count real ecaps. XXX PCI spec
+ * indicates to use cap id = 0, version = 0, next = 0 if
+ * ecaps are absent, hope users check all the way to next.
+ */
+ if (hidden)
+ *(__le32 *)&vdev->vconfig[epos] &=
+ cpu_to_le32((0xffcU << 20));
+ else
+ ecaps++;
+
+ prev = (__le32 *)&vdev->vconfig[epos];
+ epos = PCI_EXT_CAP_NEXT(header);
+ }
+
+ if (!ecaps)
+ *(u32 *)&vdev->vconfig[PCI_CFG_SPACE_SIZE] = 0;
+
+ return 0;
+}
+
+/*
+ * For each device we allocate a pci_config_map that indicates the
+ * capability occupying each dword and thus the struct perm_bits we
+ * use for read and write. We also allocate a virtualized config
+ * space which tracks reads and writes to bits that we emulate for
+ * the user. Initial values filled from device.
+ *
+ * Using shared stuct perm_bits between all vfio-pci devices saves
+ * us from allocating cfg_size buffers for virt and write for every
+ * device. We could remove vconfig and allocate individual buffers
+ * for each area requring emulated bits, but the array of pointers
+ * would be comparable in size (at least for standard config space).
+ */
+int vfio_config_init(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ u8 *map, *vconfig;
+ int ret;
+
+ /*
+ * Config space, caps and ecaps are all dword aligned, so we could
+ * use one byte per dword to record the type. However, there are
+ * no requiremenst on the length of a capability, so the gap between
+ * capabilities needs byte granularity.
+ */
+ map = kmalloc(pdev->cfg_size, GFP_KERNEL);
+ if (!map)
+ return -ENOMEM;
+
+ vconfig = kmalloc(pdev->cfg_size, GFP_KERNEL);
+ if (!vconfig) {
+ kfree(map);
+ return -ENOMEM;
+ }
+
+ vdev->pci_config_map = map;
+ vdev->vconfig = vconfig;
+
+ memset(map, PCI_CAP_ID_BASIC, PCI_STD_HEADER_SIZEOF);
+ memset(map + PCI_STD_HEADER_SIZEOF, PCI_CAP_ID_INVALID,
+ pdev->cfg_size - PCI_STD_HEADER_SIZEOF);
+
+ ret = vfio_fill_vconfig_bytes(vdev, 0, PCI_STD_HEADER_SIZEOF);
+ if (ret)
+ goto out;
+
+ vdev->bardirty = true;
+
+ /*
+ * XXX can we just pci_load_saved_state/pci_restore_state?
+ * may need to rebuild vconfig after that
+ */
+
+ /* For restore after reset */
+ vdev->rbar[0] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_0]);
+ vdev->rbar[1] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_1]);
+ vdev->rbar[2] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_2]);
+ vdev->rbar[3] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_3]);
+ vdev->rbar[4] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_4]);
+ vdev->rbar[5] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_5]);
+ vdev->rbar[6] = le32_to_cpu(*(__le32 *)&vconfig[PCI_ROM_ADDRESS]);
+
+ if (pdev->is_virtfn) {
+ *(__le16 *)&vconfig[PCI_VENDOR_ID] = cpu_to_le16(pdev->vendor);
+ *(__le16 *)&vconfig[PCI_DEVICE_ID] = cpu_to_le16(pdev->device);
+ }
+
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX))
+ vconfig[PCI_INTERRUPT_PIN] = 0;
+
+ ret = vfio_cap_init(vdev);
+ if (ret)
+ goto out;
+
+ ret = vfio_ecap_init(vdev);
+ if (ret)
+ goto out;
+
+ return 0;
+
+out:
+ kfree(map);
+ vdev->pci_config_map = NULL;
+ kfree(vconfig);
+ vdev->vconfig = NULL;
+ return pcibios_err_to_errno(ret);
+}
+
+void vfio_config_free(struct vfio_pci_device *vdev)
+{
+ kfree(vdev->vconfig);
+ vdev->vconfig = NULL;
+ kfree(vdev->pci_config_map);
+ vdev->pci_config_map = NULL;
+ kfree(vdev->msi_perm);
+ vdev->msi_perm = NULL;
+}
+
+/*
+ * Find the remaining number of bytes in a dword that match the given
+ * position. Stop at either the end of the capability or the dword boundary.
+ */
+static size_t vfio_pci_cap_remaining_dword(struct vfio_pci_device *vdev,
+ loff_t pos)
+{
+ u8 cap = vdev->pci_config_map[pos];
+ size_t i;
+
+ for (i = 1; (pos + i) % 4 && vdev->pci_config_map[pos + i] == cap; i++)
+ /* nop */;
+
+ return i;
+}
+
+static ssize_t vfio_config_do_rw(struct vfio_pci_device *vdev, char __user *buf,
+ size_t count, loff_t *ppos, bool iswrite)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ struct perm_bits *perm;
+ __le32 val = 0;
+ int cap_start = 0, offset;
+ u8 cap_id;
+ ssize_t ret;
+
+ if (*ppos < 0 || *ppos >= pdev->cfg_size ||
+ *ppos + count > pdev->cfg_size)
+ return -EFAULT;
+
+ /*
+ * Chop accesses into aligned chunks containing no more than a
+ * single capability. Caller increments to the next chunk.
+ */
+ count = min(count, vfio_pci_cap_remaining_dword(vdev, *ppos));
+ if (count >= 4 && !(*ppos % 4))
+ count = 4;
+ else if (count >= 2 && !(*ppos % 2))
+ count = 2;
+ else
+ count = 1;
+
+ ret = count;
+
+ cap_id = vdev->pci_config_map[*ppos];
+
+ if (cap_id == PCI_CAP_ID_INVALID) {
+ perm = &unassigned_perms;
+ cap_start = *ppos;
+ } else {
+ if (*ppos >= PCI_CFG_SPACE_SIZE) {
+ WARN_ON(cap_id > PCI_EXT_CAP_ID_MAX);
+
+ perm = &ecap_perms[cap_id];
+ cap_start = vfio_find_cap_start(vdev, *ppos);
+ } else {
+ WARN_ON(cap_id > PCI_CAP_ID_MAX);
+
+ perm = &cap_perms[cap_id];
+
+ if (cap_id == PCI_CAP_ID_MSI)
+ perm = vdev->msi_perm;
+
+ if (cap_id > PCI_CAP_ID_BASIC)
+ cap_start = vfio_find_cap_start(vdev, *ppos);
+ }
+ }
+
+ WARN_ON(!cap_start && cap_id != PCI_CAP_ID_BASIC);
+ WARN_ON(cap_start > *ppos);
+
+ offset = *ppos - cap_start;
+
+ if (iswrite) {
+ if (!perm->writefn)
+ return ret;
+
+ if (copy_from_user(&val, buf, count))
+ return -EFAULT;
+
+ ret = perm->writefn(vdev, *ppos, count, perm, offset, val);
+ } else {
+ if (perm->readfn) {
+ ret = perm->readfn(vdev, *ppos, count,
+ perm, offset, &val);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (copy_to_user(buf, &val, count))
+ return -EFAULT;
+ }
+
+ return ret;
+}
+
+ssize_t vfio_pci_config_rw(struct vfio_pci_device *vdev, char __user *buf,
+ size_t count, loff_t *ppos, bool iswrite)
+{
+ size_t done = 0;
+ int ret = 0;
+ loff_t pos = *ppos;
+
+ pos &= VFIO_PCI_OFFSET_MASK;
+
+ while (count) {
+ ret = vfio_config_do_rw(vdev, buf, count, &pos, iswrite);
+ if (ret < 0)
+ return ret;
+
+ count -= ret;
+ done += ret;
+ buf += ret;
+ pos += ret;
+ }
+
+ *ppos += done;
+
+ return done;
+}
diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
new file mode 100644
index 000000000..1f577b4ac
--- /dev/null
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -0,0 +1,675 @@
+/*
+ * VFIO PCI interrupt handling
+ *
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/eventfd.h>
+#include <linux/msi.h>
+#include <linux/pci.h>
+#include <linux/file.h>
+#include <linux/vfio.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+
+#include "vfio_pci_private.h"
+
+/*
+ * INTx
+ */
+static void vfio_send_intx_eventfd(void *opaque, void *unused)
+{
+ struct vfio_pci_device *vdev = opaque;
+
+ if (likely(is_intx(vdev) && !vdev->virq_disabled))
+ eventfd_signal(vdev->ctx[0].trigger, 1);
+}
+
+void vfio_pci_intx_mask(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vdev->irqlock, flags);
+
+ /*
+ * Masking can come from interrupt, ioctl, or config space
+ * via INTx disable. The latter means this can get called
+ * even when not using intx delivery. In this case, just
+ * try to have the physical bit follow the virtual bit.
+ */
+ if (unlikely(!is_intx(vdev))) {
+ if (vdev->pci_2_3)
+ pci_intx(pdev, 0);
+ } else if (!vdev->ctx[0].masked) {
+ /*
+ * Can't use check_and_mask here because we always want to
+ * mask, not just when something is pending.
+ */
+ if (vdev->pci_2_3)
+ pci_intx(pdev, 0);
+ else
+ disable_irq_nosync(pdev->irq);
+
+ vdev->ctx[0].masked = true;
+ }
+
+ spin_unlock_irqrestore(&vdev->irqlock, flags);
+}
+
+/*
+ * If this is triggered by an eventfd, we can't call eventfd_signal
+ * or else we'll deadlock on the eventfd wait queue. Return >0 when
+ * a signal is necessary, which can then be handled via a work queue
+ * or directly depending on the caller.
+ */
+static int vfio_pci_intx_unmask_handler(void *opaque, void *unused)
+{
+ struct vfio_pci_device *vdev = opaque;
+ struct pci_dev *pdev = vdev->pdev;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&vdev->irqlock, flags);
+
+ /*
+ * Unmasking comes from ioctl or config, so again, have the
+ * physical bit follow the virtual even when not using INTx.
+ */
+ if (unlikely(!is_intx(vdev))) {
+ if (vdev->pci_2_3)
+ pci_intx(pdev, 1);
+ } else if (vdev->ctx[0].masked && !vdev->virq_disabled) {
+ /*
+ * A pending interrupt here would immediately trigger,
+ * but we can avoid that overhead by just re-sending
+ * the interrupt to the user.
+ */
+ if (vdev->pci_2_3) {
+ if (!pci_check_and_unmask_intx(pdev))
+ ret = 1;
+ } else
+ enable_irq(pdev->irq);
+
+ vdev->ctx[0].masked = (ret > 0);
+ }
+
+ spin_unlock_irqrestore(&vdev->irqlock, flags);
+
+ return ret;
+}
+
+void vfio_pci_intx_unmask(struct vfio_pci_device *vdev)
+{
+ if (vfio_pci_intx_unmask_handler(vdev, NULL) > 0)
+ vfio_send_intx_eventfd(vdev, NULL);
+}
+
+static irqreturn_t vfio_intx_handler(int irq, void *dev_id)
+{
+ struct vfio_pci_device *vdev = dev_id;
+ unsigned long flags;
+ int ret = IRQ_NONE;
+
+ spin_lock_irqsave(&vdev->irqlock, flags);
+
+ if (!vdev->pci_2_3) {
+ disable_irq_nosync(vdev->pdev->irq);
+ vdev->ctx[0].masked = true;
+ ret = IRQ_HANDLED;
+ } else if (!vdev->ctx[0].masked && /* may be shared */
+ pci_check_and_mask_intx(vdev->pdev)) {
+ vdev->ctx[0].masked = true;
+ ret = IRQ_HANDLED;
+ }
+
+ spin_unlock_irqrestore(&vdev->irqlock, flags);
+
+ if (ret == IRQ_HANDLED)
+ vfio_send_intx_eventfd(vdev, NULL);
+
+ return ret;
+}
+
+static int vfio_intx_enable(struct vfio_pci_device *vdev)
+{
+ if (!is_irq_none(vdev))
+ return -EINVAL;
+
+ if (!vdev->pdev->irq)
+ return -ENODEV;
+
+ vdev->ctx = kzalloc(sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
+ if (!vdev->ctx)
+ return -ENOMEM;
+
+ vdev->num_ctx = 1;
+
+ /*
+ * If the virtual interrupt is masked, restore it. Devices
+ * supporting DisINTx can be masked at the hardware level
+ * here, non-PCI-2.3 devices will have to wait until the
+ * interrupt is enabled.
+ */
+ vdev->ctx[0].masked = vdev->virq_disabled;
+ if (vdev->pci_2_3)
+ pci_intx(vdev->pdev, !vdev->ctx[0].masked);
+
+ vdev->irq_type = VFIO_PCI_INTX_IRQ_INDEX;
+
+ return 0;
+}
+
+static int vfio_intx_set_signal(struct vfio_pci_device *vdev, int fd)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ unsigned long irqflags = IRQF_SHARED;
+ struct eventfd_ctx *trigger;
+ unsigned long flags;
+ int ret;
+
+ if (vdev->ctx[0].trigger) {
+ free_irq(pdev->irq, vdev);
+ kfree(vdev->ctx[0].name);
+ eventfd_ctx_put(vdev->ctx[0].trigger);
+ vdev->ctx[0].trigger = NULL;
+ }
+
+ if (fd < 0) /* Disable only */
+ return 0;
+
+ vdev->ctx[0].name = kasprintf(GFP_KERNEL, "vfio-intx(%s)",
+ pci_name(pdev));
+ if (!vdev->ctx[0].name)
+ return -ENOMEM;
+
+ trigger = eventfd_ctx_fdget(fd);
+ if (IS_ERR(trigger)) {
+ kfree(vdev->ctx[0].name);
+ return PTR_ERR(trigger);
+ }
+
+ vdev->ctx[0].trigger = trigger;
+
+ if (!vdev->pci_2_3)
+ irqflags = 0;
+
+ ret = request_irq(pdev->irq, vfio_intx_handler,
+ irqflags, vdev->ctx[0].name, vdev);
+ if (ret) {
+ vdev->ctx[0].trigger = NULL;
+ kfree(vdev->ctx[0].name);
+ eventfd_ctx_put(trigger);
+ return ret;
+ }
+
+ /*
+ * INTx disable will stick across the new irq setup,
+ * disable_irq won't.
+ */
+ spin_lock_irqsave(&vdev->irqlock, flags);
+ if (!vdev->pci_2_3 && vdev->ctx[0].masked)
+ disable_irq_nosync(pdev->irq);
+ spin_unlock_irqrestore(&vdev->irqlock, flags);
+
+ return 0;
+}
+
+static void vfio_intx_disable(struct vfio_pci_device *vdev)
+{
+ vfio_intx_set_signal(vdev, -1);
+ vfio_virqfd_disable(&vdev->ctx[0].unmask);
+ vfio_virqfd_disable(&vdev->ctx[0].mask);
+ vdev->irq_type = VFIO_PCI_NUM_IRQS;
+ vdev->num_ctx = 0;
+ kfree(vdev->ctx);
+}
+
+/*
+ * MSI/MSI-X
+ */
+static irqreturn_t vfio_msihandler(int irq, void *arg)
+{
+ struct eventfd_ctx *trigger = arg;
+
+ eventfd_signal(trigger, 1);
+ return IRQ_HANDLED;
+}
+
+static int vfio_msi_enable(struct vfio_pci_device *vdev, int nvec, bool msix)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int ret;
+
+ if (!is_irq_none(vdev))
+ return -EINVAL;
+
+ vdev->ctx = kzalloc(nvec * sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
+ if (!vdev->ctx)
+ return -ENOMEM;
+
+ if (msix) {
+ int i;
+
+ vdev->msix = kzalloc(nvec * sizeof(struct msix_entry),
+ GFP_KERNEL);
+ if (!vdev->msix) {
+ kfree(vdev->ctx);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < nvec; i++)
+ vdev->msix[i].entry = i;
+
+ ret = pci_enable_msix_range(pdev, vdev->msix, 1, nvec);
+ if (ret < nvec) {
+ if (ret > 0)
+ pci_disable_msix(pdev);
+ kfree(vdev->msix);
+ kfree(vdev->ctx);
+ return ret;
+ }
+ } else {
+ ret = pci_enable_msi_range(pdev, 1, nvec);
+ if (ret < nvec) {
+ if (ret > 0)
+ pci_disable_msi(pdev);
+ kfree(vdev->ctx);
+ return ret;
+ }
+ }
+
+ vdev->num_ctx = nvec;
+ vdev->irq_type = msix ? VFIO_PCI_MSIX_IRQ_INDEX :
+ VFIO_PCI_MSI_IRQ_INDEX;
+
+ if (!msix) {
+ /*
+ * Compute the virtual hardware field for max msi vectors -
+ * it is the log base 2 of the number of vectors.
+ */
+ vdev->msi_qmax = fls(nvec * 2 - 1) - 1;
+ }
+
+ return 0;
+}
+
+static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
+ int vector, int fd, bool msix)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int irq = msix ? vdev->msix[vector].vector : pdev->irq + vector;
+ char *name = msix ? "vfio-msix" : "vfio-msi";
+ struct eventfd_ctx *trigger;
+ int ret;
+
+ if (vector >= vdev->num_ctx)
+ return -EINVAL;
+
+ if (vdev->ctx[vector].trigger) {
+ free_irq(irq, vdev->ctx[vector].trigger);
+ kfree(vdev->ctx[vector].name);
+ eventfd_ctx_put(vdev->ctx[vector].trigger);
+ vdev->ctx[vector].trigger = NULL;
+ }
+
+ if (fd < 0)
+ return 0;
+
+ vdev->ctx[vector].name = kasprintf(GFP_KERNEL, "%s[%d](%s)",
+ name, vector, pci_name(pdev));
+ if (!vdev->ctx[vector].name)
+ return -ENOMEM;
+
+ trigger = eventfd_ctx_fdget(fd);
+ if (IS_ERR(trigger)) {
+ kfree(vdev->ctx[vector].name);
+ return PTR_ERR(trigger);
+ }
+
+ /*
+ * The MSIx vector table resides in device memory which may be cleared
+ * via backdoor resets. We don't allow direct access to the vector
+ * table so even if a userspace driver attempts to save/restore around
+ * such a reset it would be unsuccessful. To avoid this, restore the
+ * cached value of the message prior to enabling.
+ */
+ if (msix) {
+ struct msi_msg msg;
+
+ get_cached_msi_msg(irq, &msg);
+ pci_write_msi_msg(irq, &msg);
+ }
+
+ ret = request_irq(irq, vfio_msihandler, 0,
+ vdev->ctx[vector].name, trigger);
+ if (ret) {
+ kfree(vdev->ctx[vector].name);
+ eventfd_ctx_put(trigger);
+ return ret;
+ }
+
+ vdev->ctx[vector].trigger = trigger;
+
+ return 0;
+}
+
+static int vfio_msi_set_block(struct vfio_pci_device *vdev, unsigned start,
+ unsigned count, int32_t *fds, bool msix)
+{
+ int i, j, ret = 0;
+
+ if (start + count > vdev->num_ctx)
+ return -EINVAL;
+
+ for (i = 0, j = start; i < count && !ret; i++, j++) {
+ int fd = fds ? fds[i] : -1;
+ ret = vfio_msi_set_vector_signal(vdev, j, fd, msix);
+ }
+
+ if (ret) {
+ for (--j; j >= start; j--)
+ vfio_msi_set_vector_signal(vdev, j, -1, msix);
+ }
+
+ return ret;
+}
+
+static void vfio_msi_disable(struct vfio_pci_device *vdev, bool msix)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int i;
+
+ vfio_msi_set_block(vdev, 0, vdev->num_ctx, NULL, msix);
+
+ for (i = 0; i < vdev->num_ctx; i++) {
+ vfio_virqfd_disable(&vdev->ctx[i].unmask);
+ vfio_virqfd_disable(&vdev->ctx[i].mask);
+ }
+
+ if (msix) {
+ pci_disable_msix(vdev->pdev);
+ kfree(vdev->msix);
+ } else
+ pci_disable_msi(pdev);
+
+ vdev->irq_type = VFIO_PCI_NUM_IRQS;
+ vdev->num_ctx = 0;
+ kfree(vdev->ctx);
+}
+
+/*
+ * IOCTL support
+ */
+static int vfio_pci_set_intx_unmask(struct vfio_pci_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags, void *data)
+{
+ if (!is_intx(vdev) || start != 0 || count != 1)
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ vfio_pci_intx_unmask(vdev);
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t unmask = *(uint8_t *)data;
+ if (unmask)
+ vfio_pci_intx_unmask(vdev);
+ } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+ if (fd >= 0)
+ return vfio_virqfd_enable((void *) vdev,
+ vfio_pci_intx_unmask_handler,
+ vfio_send_intx_eventfd, NULL,
+ &vdev->ctx[0].unmask, fd);
+
+ vfio_virqfd_disable(&vdev->ctx[0].unmask);
+ }
+
+ return 0;
+}
+
+static int vfio_pci_set_intx_mask(struct vfio_pci_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags, void *data)
+{
+ if (!is_intx(vdev) || start != 0 || count != 1)
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ vfio_pci_intx_mask(vdev);
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t mask = *(uint8_t *)data;
+ if (mask)
+ vfio_pci_intx_mask(vdev);
+ } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ return -ENOTTY; /* XXX implement me */
+ }
+
+ return 0;
+}
+
+static int vfio_pci_set_intx_trigger(struct vfio_pci_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags, void *data)
+{
+ if (is_intx(vdev) && !count && (flags & VFIO_IRQ_SET_DATA_NONE)) {
+ vfio_intx_disable(vdev);
+ return 0;
+ }
+
+ if (!(is_intx(vdev) || is_irq_none(vdev)) || start != 0 || count != 1)
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+ int ret;
+
+ if (is_intx(vdev))
+ return vfio_intx_set_signal(vdev, fd);
+
+ ret = vfio_intx_enable(vdev);
+ if (ret)
+ return ret;
+
+ ret = vfio_intx_set_signal(vdev, fd);
+ if (ret)
+ vfio_intx_disable(vdev);
+
+ return ret;
+ }
+
+ if (!is_intx(vdev))
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ vfio_send_intx_eventfd(vdev, NULL);
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t trigger = *(uint8_t *)data;
+ if (trigger)
+ vfio_send_intx_eventfd(vdev, NULL);
+ }
+ return 0;
+}
+
+static int vfio_pci_set_msi_trigger(struct vfio_pci_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags, void *data)
+{
+ int i;
+ bool msix = (index == VFIO_PCI_MSIX_IRQ_INDEX) ? true : false;
+
+ if (irq_is(vdev, index) && !count && (flags & VFIO_IRQ_SET_DATA_NONE)) {
+ vfio_msi_disable(vdev, msix);
+ return 0;
+ }
+
+ if (!(irq_is(vdev, index) || is_irq_none(vdev)))
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t *fds = data;
+ int ret;
+
+ if (vdev->irq_type == index)
+ return vfio_msi_set_block(vdev, start, count,
+ fds, msix);
+
+ ret = vfio_msi_enable(vdev, start + count, msix);
+ if (ret)
+ return ret;
+
+ ret = vfio_msi_set_block(vdev, start, count, fds, msix);
+ if (ret)
+ vfio_msi_disable(vdev, msix);
+
+ return ret;
+ }
+
+ if (!irq_is(vdev, index) || start + count > vdev->num_ctx)
+ return -EINVAL;
+
+ for (i = start; i < start + count; i++) {
+ if (!vdev->ctx[i].trigger)
+ continue;
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ eventfd_signal(vdev->ctx[i].trigger, 1);
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t *bools = data;
+ if (bools[i - start])
+ eventfd_signal(vdev->ctx[i].trigger, 1);
+ }
+ }
+ return 0;
+}
+
+static int vfio_pci_set_ctx_trigger_single(struct eventfd_ctx **ctx,
+ uint32_t flags, void *data)
+{
+ int32_t fd = *(int32_t *)data;
+
+ if (!(flags & VFIO_IRQ_SET_DATA_TYPE_MASK))
+ return -EINVAL;
+
+ /* DATA_NONE/DATA_BOOL enables loopback testing */
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ if (*ctx)
+ eventfd_signal(*ctx, 1);
+ return 0;
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t trigger = *(uint8_t *)data;
+ if (trigger && *ctx)
+ eventfd_signal(*ctx, 1);
+ return 0;
+ }
+
+ /* Handle SET_DATA_EVENTFD */
+ if (fd == -1) {
+ if (*ctx)
+ eventfd_ctx_put(*ctx);
+ *ctx = NULL;
+ return 0;
+ } else if (fd >= 0) {
+ struct eventfd_ctx *efdctx;
+ efdctx = eventfd_ctx_fdget(fd);
+ if (IS_ERR(efdctx))
+ return PTR_ERR(efdctx);
+ if (*ctx)
+ eventfd_ctx_put(*ctx);
+ *ctx = efdctx;
+ return 0;
+ } else
+ return -EINVAL;
+}
+
+static int vfio_pci_set_err_trigger(struct vfio_pci_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags, void *data)
+{
+ if (index != VFIO_PCI_ERR_IRQ_INDEX)
+ return -EINVAL;
+
+ /*
+ * We should sanitize start & count, but that wasn't caught
+ * originally, so this IRQ index must forever ignore them :-(
+ */
+
+ return vfio_pci_set_ctx_trigger_single(&vdev->err_trigger, flags, data);
+}
+
+static int vfio_pci_set_req_trigger(struct vfio_pci_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags, void *data)
+{
+ if (index != VFIO_PCI_REQ_IRQ_INDEX || start != 0 || count != 1)
+ return -EINVAL;
+
+ return vfio_pci_set_ctx_trigger_single(&vdev->req_trigger, flags, data);
+}
+
+int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
+ unsigned index, unsigned start, unsigned count,
+ void *data)
+{
+ int (*func)(struct vfio_pci_device *vdev, unsigned index,
+ unsigned start, unsigned count, uint32_t flags,
+ void *data) = NULL;
+
+ switch (index) {
+ case VFIO_PCI_INTX_IRQ_INDEX:
+ switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+ case VFIO_IRQ_SET_ACTION_MASK:
+ func = vfio_pci_set_intx_mask;
+ break;
+ case VFIO_IRQ_SET_ACTION_UNMASK:
+ func = vfio_pci_set_intx_unmask;
+ break;
+ case VFIO_IRQ_SET_ACTION_TRIGGER:
+ func = vfio_pci_set_intx_trigger;
+ break;
+ }
+ break;
+ case VFIO_PCI_MSI_IRQ_INDEX:
+ case VFIO_PCI_MSIX_IRQ_INDEX:
+ switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+ case VFIO_IRQ_SET_ACTION_MASK:
+ case VFIO_IRQ_SET_ACTION_UNMASK:
+ /* XXX Need masking support exported */
+ break;
+ case VFIO_IRQ_SET_ACTION_TRIGGER:
+ func = vfio_pci_set_msi_trigger;
+ break;
+ }
+ break;
+ case VFIO_PCI_ERR_IRQ_INDEX:
+ switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+ case VFIO_IRQ_SET_ACTION_TRIGGER:
+ if (pci_is_pcie(vdev->pdev))
+ func = vfio_pci_set_err_trigger;
+ break;
+ }
+ break;
+ case VFIO_PCI_REQ_IRQ_INDEX:
+ switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+ case VFIO_IRQ_SET_ACTION_TRIGGER:
+ func = vfio_pci_set_req_trigger;
+ break;
+ }
+ break;
+ }
+
+ if (!func)
+ return -ENOTTY;
+
+ return func(vdev, index, start, count, flags, data);
+}
diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
new file mode 100644
index 000000000..ae0e1b4c1
--- /dev/null
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+#include <linux/mutex.h>
+#include <linux/pci.h>
+
+#ifndef VFIO_PCI_PRIVATE_H
+#define VFIO_PCI_PRIVATE_H
+
+#define VFIO_PCI_OFFSET_SHIFT 40
+
+#define VFIO_PCI_OFFSET_TO_INDEX(off) (off >> VFIO_PCI_OFFSET_SHIFT)
+#define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
+#define VFIO_PCI_OFFSET_MASK (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
+
+struct vfio_pci_irq_ctx {
+ struct eventfd_ctx *trigger;
+ struct virqfd *unmask;
+ struct virqfd *mask;
+ char *name;
+ bool masked;
+};
+
+struct vfio_pci_device {
+ struct pci_dev *pdev;
+ void __iomem *barmap[PCI_STD_RESOURCE_END + 1];
+ u8 *pci_config_map;
+ u8 *vconfig;
+ struct perm_bits *msi_perm;
+ spinlock_t irqlock;
+ struct mutex igate;
+ struct msix_entry *msix;
+ struct vfio_pci_irq_ctx *ctx;
+ int num_ctx;
+ int irq_type;
+ u8 msi_qmax;
+ u8 msix_bar;
+ u16 msix_size;
+ u32 msix_offset;
+ u32 rbar[7];
+ bool pci_2_3;
+ bool virq_disabled;
+ bool reset_works;
+ bool extended_caps;
+ bool bardirty;
+ bool has_vga;
+ bool needs_reset;
+ struct pci_saved_state *pci_saved_state;
+ int refcnt;
+ struct eventfd_ctx *err_trigger;
+ struct eventfd_ctx *req_trigger;
+};
+
+#define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
+#define is_msi(vdev) (vdev->irq_type == VFIO_PCI_MSI_IRQ_INDEX)
+#define is_msix(vdev) (vdev->irq_type == VFIO_PCI_MSIX_IRQ_INDEX)
+#define is_irq_none(vdev) (!(is_intx(vdev) || is_msi(vdev) || is_msix(vdev)))
+#define irq_is(vdev, type) (vdev->irq_type == type)
+
+extern void vfio_pci_intx_mask(struct vfio_pci_device *vdev);
+extern void vfio_pci_intx_unmask(struct vfio_pci_device *vdev);
+
+extern int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev,
+ uint32_t flags, unsigned index,
+ unsigned start, unsigned count, void *data);
+
+extern ssize_t vfio_pci_config_rw(struct vfio_pci_device *vdev,
+ char __user *buf, size_t count,
+ loff_t *ppos, bool iswrite);
+
+extern ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf,
+ size_t count, loff_t *ppos, bool iswrite);
+
+extern ssize_t vfio_pci_vga_rw(struct vfio_pci_device *vdev, char __user *buf,
+ size_t count, loff_t *ppos, bool iswrite);
+
+extern int vfio_pci_init_perm_bits(void);
+extern void vfio_pci_uninit_perm_bits(void);
+
+extern int vfio_config_init(struct vfio_pci_device *vdev);
+extern void vfio_config_free(struct vfio_pci_device *vdev);
+#endif /* VFIO_PCI_PRIVATE_H */
diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c
new file mode 100644
index 000000000..210db24d2
--- /dev/null
+++ b/drivers/vfio/pci/vfio_pci_rdwr.c
@@ -0,0 +1,238 @@
+/*
+ * VFIO PCI I/O Port & MMIO access
+ *
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+#include <linux/fs.h>
+#include <linux/pci.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/vgaarb.h>
+
+#include "vfio_pci_private.h"
+
+/*
+ * Read or write from an __iomem region (MMIO or I/O port) with an excluded
+ * range which is inaccessible. The excluded range drops writes and fills
+ * reads with -1. This is intended for handling MSI-X vector tables and
+ * leftover space for ROM BARs.
+ */
+static ssize_t do_io_rw(void __iomem *io, char __user *buf,
+ loff_t off, size_t count, size_t x_start,
+ size_t x_end, bool iswrite)
+{
+ ssize_t done = 0;
+
+ while (count) {
+ size_t fillable, filled;
+
+ if (off < x_start)
+ fillable = min(count, (size_t)(x_start - off));
+ else if (off >= x_end)
+ fillable = count;
+ else
+ fillable = 0;
+
+ if (fillable >= 4 && !(off % 4)) {
+ __le32 val;
+
+ if (iswrite) {
+ if (copy_from_user(&val, buf, 4))
+ return -EFAULT;
+
+ iowrite32(le32_to_cpu(val), io + off);
+ } else {
+ val = cpu_to_le32(ioread32(io + off));
+
+ if (copy_to_user(buf, &val, 4))
+ return -EFAULT;
+ }
+
+ filled = 4;
+ } else if (fillable >= 2 && !(off % 2)) {
+ __le16 val;
+
+ if (iswrite) {
+ if (copy_from_user(&val, buf, 2))
+ return -EFAULT;
+
+ iowrite16(le16_to_cpu(val), io + off);
+ } else {
+ val = cpu_to_le16(ioread16(io + off));
+
+ if (copy_to_user(buf, &val, 2))
+ return -EFAULT;
+ }
+
+ filled = 2;
+ } else if (fillable) {
+ u8 val;
+
+ if (iswrite) {
+ if (copy_from_user(&val, buf, 1))
+ return -EFAULT;
+
+ iowrite8(val, io + off);
+ } else {
+ val = ioread8(io + off);
+
+ if (copy_to_user(buf, &val, 1))
+ return -EFAULT;
+ }
+
+ filled = 1;
+ } else {
+ /* Fill reads with -1, drop writes */
+ filled = min(count, (size_t)(x_end - off));
+ if (!iswrite) {
+ u8 val = 0xFF;
+ size_t i;
+
+ for (i = 0; i < filled; i++)
+ if (copy_to_user(buf + i, &val, 1))
+ return -EFAULT;
+ }
+ }
+
+ count -= filled;
+ done += filled;
+ off += filled;
+ buf += filled;
+ }
+
+ return done;
+}
+
+ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf,
+ size_t count, loff_t *ppos, bool iswrite)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
+ int bar = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
+ size_t x_start = 0, x_end = 0;
+ resource_size_t end;
+ void __iomem *io;
+ ssize_t done;
+
+ if (!pci_resource_start(pdev, bar))
+ return -EINVAL;
+
+ end = pci_resource_len(pdev, bar);
+
+ if (pos >= end)
+ return -EINVAL;
+
+ count = min(count, (size_t)(end - pos));
+
+ if (bar == PCI_ROM_RESOURCE) {
+ /*
+ * The ROM can fill less space than the BAR, so we start the
+ * excluded range at the end of the actual ROM. This makes
+ * filling large ROM BARs much faster.
+ */
+ io = pci_map_rom(pdev, &x_start);
+ if (!io)
+ return -ENOMEM;
+ x_end = end;
+ } else if (!vdev->barmap[bar]) {
+ int ret;
+
+ ret = pci_request_selected_regions(pdev, 1 << bar, "vfio");
+ if (ret)
+ return ret;
+
+ io = pci_iomap(pdev, bar, 0);
+ if (!io) {
+ pci_release_selected_regions(pdev, 1 << bar);
+ return -ENOMEM;
+ }
+
+ vdev->barmap[bar] = io;
+ } else
+ io = vdev->barmap[bar];
+
+ if (bar == vdev->msix_bar) {
+ x_start = vdev->msix_offset;
+ x_end = vdev->msix_offset + vdev->msix_size;
+ }
+
+ done = do_io_rw(io, buf, pos, count, x_start, x_end, iswrite);
+
+ if (done >= 0)
+ *ppos += done;
+
+ if (bar == PCI_ROM_RESOURCE)
+ pci_unmap_rom(pdev, io);
+
+ return done;
+}
+
+ssize_t vfio_pci_vga_rw(struct vfio_pci_device *vdev, char __user *buf,
+ size_t count, loff_t *ppos, bool iswrite)
+{
+ int ret;
+ loff_t off, pos = *ppos & VFIO_PCI_OFFSET_MASK;
+ void __iomem *iomem = NULL;
+ unsigned int rsrc;
+ bool is_ioport;
+ ssize_t done;
+
+ if (!vdev->has_vga)
+ return -EINVAL;
+
+ switch (pos) {
+ case 0xa0000 ... 0xbffff:
+ count = min(count, (size_t)(0xc0000 - pos));
+ iomem = ioremap_nocache(0xa0000, 0xbffff - 0xa0000 + 1);
+ off = pos - 0xa0000;
+ rsrc = VGA_RSRC_LEGACY_MEM;
+ is_ioport = false;
+ break;
+ case 0x3b0 ... 0x3bb:
+ count = min(count, (size_t)(0x3bc - pos));
+ iomem = ioport_map(0x3b0, 0x3bb - 0x3b0 + 1);
+ off = pos - 0x3b0;
+ rsrc = VGA_RSRC_LEGACY_IO;
+ is_ioport = true;
+ break;
+ case 0x3c0 ... 0x3df:
+ count = min(count, (size_t)(0x3e0 - pos));
+ iomem = ioport_map(0x3c0, 0x3df - 0x3c0 + 1);
+ off = pos - 0x3c0;
+ rsrc = VGA_RSRC_LEGACY_IO;
+ is_ioport = true;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (!iomem)
+ return -ENOMEM;
+
+ ret = vga_get_interruptible(vdev->pdev, rsrc);
+ if (ret) {
+ is_ioport ? ioport_unmap(iomem) : iounmap(iomem);
+ return ret;
+ }
+
+ done = do_io_rw(iomem, buf, off, count, 0, 0, iswrite);
+
+ vga_put(vdev->pdev, rsrc);
+
+ is_ioport ? ioport_unmap(iomem) : iounmap(iomem);
+
+ if (done >= 0)
+ *ppos += done;
+
+ return done;
+}
diff --git a/drivers/vfio/platform/Kconfig b/drivers/vfio/platform/Kconfig
new file mode 100644
index 000000000..9a4403e2a
--- /dev/null
+++ b/drivers/vfio/platform/Kconfig
@@ -0,0 +1,20 @@
+config VFIO_PLATFORM
+ tristate "VFIO support for platform devices"
+ depends on VFIO && EVENTFD && ARM
+ select VFIO_VIRQFD
+ help
+ Support for platform devices with VFIO. This is required to make
+ use of platform devices present on the system using the VFIO
+ framework.
+
+ If you don't know what to do here, say N.
+
+config VFIO_AMBA
+ tristate "VFIO support for AMBA devices"
+ depends on VFIO_PLATFORM && ARM_AMBA
+ help
+ Support for ARM AMBA devices with VFIO. This is required to make
+ use of ARM AMBA devices present on the system using the VFIO
+ framework.
+
+ If you don't know what to do here, say N.
diff --git a/drivers/vfio/platform/Makefile b/drivers/vfio/platform/Makefile
new file mode 100644
index 000000000..81de144c0
--- /dev/null
+++ b/drivers/vfio/platform/Makefile
@@ -0,0 +1,8 @@
+
+vfio-platform-y := vfio_platform.o vfio_platform_common.o vfio_platform_irq.o
+
+obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o
+
+vfio-amba-y := vfio_amba.o
+
+obj-$(CONFIG_VFIO_AMBA) += vfio-amba.o
diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
new file mode 100644
index 000000000..ff0331f72
--- /dev/null
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/vfio.h>
+#include <linux/amba/bus.h>
+
+#include "vfio_platform_private.h"
+
+#define DRIVER_VERSION "0.10"
+#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
+#define DRIVER_DESC "VFIO for AMBA devices - User Level meta-driver"
+
+/* probing devices from the AMBA bus */
+
+static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
+ int i)
+{
+ struct amba_device *adev = (struct amba_device *) vdev->opaque;
+
+ if (i == 0)
+ return &adev->res;
+
+ return NULL;
+}
+
+static int get_amba_irq(struct vfio_platform_device *vdev, int i)
+{
+ struct amba_device *adev = (struct amba_device *) vdev->opaque;
+ int ret = 0;
+
+ if (i < AMBA_NR_IRQS)
+ ret = adev->irq[i];
+
+ /* zero is an unset IRQ for AMBA devices */
+ return ret ? ret : -ENXIO;
+}
+
+static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
+{
+ struct vfio_platform_device *vdev;
+ int ret;
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev)
+ return -ENOMEM;
+
+ vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
+ if (!vdev->name) {
+ kfree(vdev);
+ return -ENOMEM;
+ }
+
+ vdev->opaque = (void *) adev;
+ vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
+ vdev->get_resource = get_amba_resource;
+ vdev->get_irq = get_amba_irq;
+
+ ret = vfio_platform_probe_common(vdev, &adev->dev);
+ if (ret) {
+ kfree(vdev->name);
+ kfree(vdev);
+ }
+
+ return ret;
+}
+
+static int vfio_amba_remove(struct amba_device *adev)
+{
+ struct vfio_platform_device *vdev;
+
+ vdev = vfio_platform_remove_common(&adev->dev);
+ if (vdev) {
+ kfree(vdev->name);
+ kfree(vdev);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static struct amba_id pl330_ids[] = {
+ { 0, 0 },
+};
+
+MODULE_DEVICE_TABLE(amba, pl330_ids);
+
+static struct amba_driver vfio_amba_driver = {
+ .probe = vfio_amba_probe,
+ .remove = vfio_amba_remove,
+ .id_table = pl330_ids,
+ .drv = {
+ .name = "vfio-amba",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_amba_driver(vfio_amba_driver);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
new file mode 100644
index 000000000..cef645c83
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/vfio.h>
+#include <linux/platform_device.h>
+
+#include "vfio_platform_private.h"
+
+#define DRIVER_VERSION "0.10"
+#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
+#define DRIVER_DESC "VFIO for platform devices - User Level meta-driver"
+
+/* probing devices from the linux platform bus */
+
+static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
+ int num)
+{
+ struct platform_device *dev = (struct platform_device *) vdev->opaque;
+ int i;
+
+ for (i = 0; i < dev->num_resources; i++) {
+ struct resource *r = &dev->resource[i];
+
+ if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {
+ if (!num)
+ return r;
+
+ num--;
+ }
+ }
+ return NULL;
+}
+
+static int get_platform_irq(struct vfio_platform_device *vdev, int i)
+{
+ struct platform_device *pdev = (struct platform_device *) vdev->opaque;
+
+ return platform_get_irq(pdev, i);
+}
+
+static int vfio_platform_probe(struct platform_device *pdev)
+{
+ struct vfio_platform_device *vdev;
+ int ret;
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev)
+ return -ENOMEM;
+
+ vdev->opaque = (void *) pdev;
+ vdev->name = pdev->name;
+ vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
+ vdev->get_resource = get_platform_resource;
+ vdev->get_irq = get_platform_irq;
+
+ ret = vfio_platform_probe_common(vdev, &pdev->dev);
+ if (ret)
+ kfree(vdev);
+
+ return ret;
+}
+
+static int vfio_platform_remove(struct platform_device *pdev)
+{
+ struct vfio_platform_device *vdev;
+
+ vdev = vfio_platform_remove_common(&pdev->dev);
+ if (vdev) {
+ kfree(vdev);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static struct platform_driver vfio_platform_driver = {
+ .probe = vfio_platform_probe,
+ .remove = vfio_platform_remove,
+ .driver = {
+ .name = "vfio-platform",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(vfio_platform_driver);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
new file mode 100644
index 000000000..abcff7a1a
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -0,0 +1,521 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+
+#include "vfio_platform_private.h"
+
+static DEFINE_MUTEX(driver_lock);
+
+static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
+{
+ int cnt = 0, i;
+
+ while (vdev->get_resource(vdev, cnt))
+ cnt++;
+
+ vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region),
+ GFP_KERNEL);
+ if (!vdev->regions)
+ return -ENOMEM;
+
+ for (i = 0; i < cnt; i++) {
+ struct resource *res =
+ vdev->get_resource(vdev, i);
+
+ if (!res)
+ goto err;
+
+ vdev->regions[i].addr = res->start;
+ vdev->regions[i].size = resource_size(res);
+ vdev->regions[i].flags = 0;
+
+ switch (resource_type(res)) {
+ case IORESOURCE_MEM:
+ vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO;
+ vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
+ if (!(res->flags & IORESOURCE_READONLY))
+ vdev->regions[i].flags |=
+ VFIO_REGION_INFO_FLAG_WRITE;
+
+ /*
+ * Only regions addressed with PAGE granularity may be
+ * MMAPed securely.
+ */
+ if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
+ !(vdev->regions[i].size & ~PAGE_MASK))
+ vdev->regions[i].flags |=
+ VFIO_REGION_INFO_FLAG_MMAP;
+
+ break;
+ case IORESOURCE_IO:
+ vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO;
+ break;
+ default:
+ goto err;
+ }
+ }
+
+ vdev->num_regions = cnt;
+
+ return 0;
+err:
+ kfree(vdev->regions);
+ return -EINVAL;
+}
+
+static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev)
+{
+ int i;
+
+ for (i = 0; i < vdev->num_regions; i++)
+ iounmap(vdev->regions[i].ioaddr);
+
+ vdev->num_regions = 0;
+ kfree(vdev->regions);
+}
+
+static void vfio_platform_release(void *device_data)
+{
+ struct vfio_platform_device *vdev = device_data;
+
+ mutex_lock(&driver_lock);
+
+ if (!(--vdev->refcnt)) {
+ vfio_platform_regions_cleanup(vdev);
+ vfio_platform_irq_cleanup(vdev);
+ }
+
+ mutex_unlock(&driver_lock);
+
+ module_put(THIS_MODULE);
+}
+
+static int vfio_platform_open(void *device_data)
+{
+ struct vfio_platform_device *vdev = device_data;
+ int ret;
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ mutex_lock(&driver_lock);
+
+ if (!vdev->refcnt) {
+ ret = vfio_platform_regions_init(vdev);
+ if (ret)
+ goto err_reg;
+
+ ret = vfio_platform_irq_init(vdev);
+ if (ret)
+ goto err_irq;
+ }
+
+ vdev->refcnt++;
+
+ mutex_unlock(&driver_lock);
+ return 0;
+
+err_irq:
+ vfio_platform_regions_cleanup(vdev);
+err_reg:
+ mutex_unlock(&driver_lock);
+ module_put(THIS_MODULE);
+ return ret;
+}
+
+static long vfio_platform_ioctl(void *device_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_platform_device *vdev = device_data;
+ unsigned long minsz;
+
+ if (cmd == VFIO_DEVICE_GET_INFO) {
+ struct vfio_device_info info;
+
+ minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ info.flags = vdev->flags;
+ info.num_regions = vdev->num_regions;
+ info.num_irqs = vdev->num_irqs;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+
+ } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
+ struct vfio_region_info info;
+
+ minsz = offsetofend(struct vfio_region_info, offset);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.index >= vdev->num_regions)
+ return -EINVAL;
+
+ /* map offset to the physical address */
+ info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
+ info.size = vdev->regions[info.index].size;
+ info.flags = vdev->regions[info.index].flags;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+
+ } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
+ struct vfio_irq_info info;
+
+ minsz = offsetofend(struct vfio_irq_info, count);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.index >= vdev->num_irqs)
+ return -EINVAL;
+
+ info.flags = vdev->irqs[info.index].flags;
+ info.count = vdev->irqs[info.index].count;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+
+ } else if (cmd == VFIO_DEVICE_SET_IRQS) {
+ struct vfio_irq_set hdr;
+ u8 *data = NULL;
+ int ret = 0;
+
+ minsz = offsetofend(struct vfio_irq_set, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz)
+ return -EINVAL;
+
+ if (hdr.index >= vdev->num_irqs)
+ return -EINVAL;
+
+ if (hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
+ VFIO_IRQ_SET_ACTION_TYPE_MASK))
+ return -EINVAL;
+
+ if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
+ size_t size;
+
+ if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
+ size = sizeof(uint8_t);
+ else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
+ size = sizeof(int32_t);
+ else
+ return -EINVAL;
+
+ if (hdr.argsz - minsz < size)
+ return -EINVAL;
+
+ data = memdup_user((void __user *)(arg + minsz), size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ }
+
+ mutex_lock(&vdev->igate);
+
+ ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
+ hdr.start, hdr.count, data);
+ mutex_unlock(&vdev->igate);
+ kfree(data);
+
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_RESET)
+ return -EINVAL;
+
+ return -ENOTTY;
+}
+
+static ssize_t vfio_platform_read_mmio(struct vfio_platform_region reg,
+ char __user *buf, size_t count,
+ loff_t off)
+{
+ unsigned int done = 0;
+
+ if (!reg.ioaddr) {
+ reg.ioaddr =
+ ioremap_nocache(reg.addr, reg.size);
+
+ if (!reg.ioaddr)
+ return -ENOMEM;
+ }
+
+ while (count) {
+ size_t filled;
+
+ if (count >= 4 && !(off % 4)) {
+ u32 val;
+
+ val = ioread32(reg.ioaddr + off);
+ if (copy_to_user(buf, &val, 4))
+ goto err;
+
+ filled = 4;
+ } else if (count >= 2 && !(off % 2)) {
+ u16 val;
+
+ val = ioread16(reg.ioaddr + off);
+ if (copy_to_user(buf, &val, 2))
+ goto err;
+
+ filled = 2;
+ } else {
+ u8 val;
+
+ val = ioread8(reg.ioaddr + off);
+ if (copy_to_user(buf, &val, 1))
+ goto err;
+
+ filled = 1;
+ }
+
+
+ count -= filled;
+ done += filled;
+ off += filled;
+ buf += filled;
+ }
+
+ return done;
+err:
+ return -EFAULT;
+}
+
+static ssize_t vfio_platform_read(void *device_data, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_platform_device *vdev = device_data;
+ unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
+ loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
+
+ if (index >= vdev->num_regions)
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ))
+ return -EINVAL;
+
+ if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
+ return vfio_platform_read_mmio(vdev->regions[index],
+ buf, count, off);
+ else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
+ return -EINVAL; /* not implemented */
+
+ return -EINVAL;
+}
+
+static ssize_t vfio_platform_write_mmio(struct vfio_platform_region reg,
+ const char __user *buf, size_t count,
+ loff_t off)
+{
+ unsigned int done = 0;
+
+ if (!reg.ioaddr) {
+ reg.ioaddr =
+ ioremap_nocache(reg.addr, reg.size);
+
+ if (!reg.ioaddr)
+ return -ENOMEM;
+ }
+
+ while (count) {
+ size_t filled;
+
+ if (count >= 4 && !(off % 4)) {
+ u32 val;
+
+ if (copy_from_user(&val, buf, 4))
+ goto err;
+ iowrite32(val, reg.ioaddr + off);
+
+ filled = 4;
+ } else if (count >= 2 && !(off % 2)) {
+ u16 val;
+
+ if (copy_from_user(&val, buf, 2))
+ goto err;
+ iowrite16(val, reg.ioaddr + off);
+
+ filled = 2;
+ } else {
+ u8 val;
+
+ if (copy_from_user(&val, buf, 1))
+ goto err;
+ iowrite8(val, reg.ioaddr + off);
+
+ filled = 1;
+ }
+
+ count -= filled;
+ done += filled;
+ off += filled;
+ buf += filled;
+ }
+
+ return done;
+err:
+ return -EFAULT;
+}
+
+static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_platform_device *vdev = device_data;
+ unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
+ loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
+
+ if (index >= vdev->num_regions)
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE))
+ return -EINVAL;
+
+ if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
+ return vfio_platform_write_mmio(vdev->regions[index],
+ buf, count, off);
+ else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
+ return -EINVAL; /* not implemented */
+
+ return -EINVAL;
+}
+
+static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
+ struct vm_area_struct *vma)
+{
+ u64 req_len, pgoff, req_start;
+
+ req_len = vma->vm_end - vma->vm_start;
+ pgoff = vma->vm_pgoff &
+ ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
+ req_start = pgoff << PAGE_SHIFT;
+
+ if (region.size < PAGE_SIZE || req_start + req_len > region.size)
+ return -EINVAL;
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
+
+ return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ req_len, vma->vm_page_prot);
+}
+
+static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma)
+{
+ struct vfio_platform_device *vdev = device_data;
+ unsigned int index;
+
+ index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT);
+
+ if (vma->vm_end < vma->vm_start)
+ return -EINVAL;
+ if (!(vma->vm_flags & VM_SHARED))
+ return -EINVAL;
+ if (index >= vdev->num_regions)
+ return -EINVAL;
+ if (vma->vm_start & ~PAGE_MASK)
+ return -EINVAL;
+ if (vma->vm_end & ~PAGE_MASK)
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
+ && (vma->vm_flags & VM_READ))
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
+ && (vma->vm_flags & VM_WRITE))
+ return -EINVAL;
+
+ vma->vm_private_data = vdev;
+
+ if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
+ return vfio_platform_mmap_mmio(vdev->regions[index], vma);
+
+ else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
+ return -EINVAL; /* not implemented */
+
+ return -EINVAL;
+}
+
+static const struct vfio_device_ops vfio_platform_ops = {
+ .name = "vfio-platform",
+ .open = vfio_platform_open,
+ .release = vfio_platform_release,
+ .ioctl = vfio_platform_ioctl,
+ .read = vfio_platform_read,
+ .write = vfio_platform_write,
+ .mmap = vfio_platform_mmap,
+};
+
+int vfio_platform_probe_common(struct vfio_platform_device *vdev,
+ struct device *dev)
+{
+ struct iommu_group *group;
+ int ret;
+
+ if (!vdev)
+ return -EINVAL;
+
+ group = iommu_group_get(dev);
+ if (!group) {
+ pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
+ return -EINVAL;
+ }
+
+ ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
+ if (ret) {
+ iommu_group_put(group);
+ return ret;
+ }
+
+ mutex_init(&vdev->igate);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
+
+struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
+{
+ struct vfio_platform_device *vdev;
+
+ vdev = vfio_del_group_dev(dev);
+ if (vdev)
+ iommu_group_put(dev->iommu_group);
+
+ return vdev;
+}
+EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
new file mode 100644
index 000000000..88bba57b3
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -0,0 +1,336 @@
+/*
+ * VFIO platform devices interrupt handling
+ *
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/eventfd.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/vfio.h>
+#include <linux/irq.h>
+
+#include "vfio_platform_private.h"
+
+static void vfio_platform_mask(struct vfio_platform_irq *irq_ctx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_ctx->lock, flags);
+
+ if (!irq_ctx->masked) {
+ disable_irq_nosync(irq_ctx->hwirq);
+ irq_ctx->masked = true;
+ }
+
+ spin_unlock_irqrestore(&irq_ctx->lock, flags);
+}
+
+static int vfio_platform_mask_handler(void *opaque, void *unused)
+{
+ struct vfio_platform_irq *irq_ctx = opaque;
+
+ vfio_platform_mask(irq_ctx);
+
+ return 0;
+}
+
+static int vfio_platform_set_irq_mask(struct vfio_platform_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags,
+ void *data)
+{
+ if (start != 0 || count != 1)
+ return -EINVAL;
+
+ if (!(vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE))
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+
+ if (fd >= 0)
+ return vfio_virqfd_enable((void *) &vdev->irqs[index],
+ vfio_platform_mask_handler,
+ NULL, NULL,
+ &vdev->irqs[index].mask, fd);
+
+ vfio_virqfd_disable(&vdev->irqs[index].mask);
+ return 0;
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ vfio_platform_mask(&vdev->irqs[index]);
+
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t mask = *(uint8_t *)data;
+
+ if (mask)
+ vfio_platform_mask(&vdev->irqs[index]);
+ }
+
+ return 0;
+}
+
+static void vfio_platform_unmask(struct vfio_platform_irq *irq_ctx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_ctx->lock, flags);
+
+ if (irq_ctx->masked) {
+ enable_irq(irq_ctx->hwirq);
+ irq_ctx->masked = false;
+ }
+
+ spin_unlock_irqrestore(&irq_ctx->lock, flags);
+}
+
+static int vfio_platform_unmask_handler(void *opaque, void *unused)
+{
+ struct vfio_platform_irq *irq_ctx = opaque;
+
+ vfio_platform_unmask(irq_ctx);
+
+ return 0;
+}
+
+static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags,
+ void *data)
+{
+ if (start != 0 || count != 1)
+ return -EINVAL;
+
+ if (!(vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE))
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+
+ if (fd >= 0)
+ return vfio_virqfd_enable((void *) &vdev->irqs[index],
+ vfio_platform_unmask_handler,
+ NULL, NULL,
+ &vdev->irqs[index].unmask,
+ fd);
+
+ vfio_virqfd_disable(&vdev->irqs[index].unmask);
+ return 0;
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ vfio_platform_unmask(&vdev->irqs[index]);
+
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t unmask = *(uint8_t *)data;
+
+ if (unmask)
+ vfio_platform_unmask(&vdev->irqs[index]);
+ }
+
+ return 0;
+}
+
+static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id)
+{
+ struct vfio_platform_irq *irq_ctx = dev_id;
+ unsigned long flags;
+ int ret = IRQ_NONE;
+
+ spin_lock_irqsave(&irq_ctx->lock, flags);
+
+ if (!irq_ctx->masked) {
+ ret = IRQ_HANDLED;
+
+ /* automask maskable interrupts */
+ disable_irq_nosync(irq_ctx->hwirq);
+ irq_ctx->masked = true;
+ }
+
+ spin_unlock_irqrestore(&irq_ctx->lock, flags);
+
+ if (ret == IRQ_HANDLED)
+ eventfd_signal(irq_ctx->trigger, 1);
+
+ return ret;
+}
+
+static irqreturn_t vfio_irq_handler(int irq, void *dev_id)
+{
+ struct vfio_platform_irq *irq_ctx = dev_id;
+
+ eventfd_signal(irq_ctx->trigger, 1);
+
+ return IRQ_HANDLED;
+}
+
+static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,
+ int fd, irq_handler_t handler)
+{
+ struct vfio_platform_irq *irq = &vdev->irqs[index];
+ struct eventfd_ctx *trigger;
+ int ret;
+
+ if (irq->trigger) {
+ free_irq(irq->hwirq, irq);
+ kfree(irq->name);
+ eventfd_ctx_put(irq->trigger);
+ irq->trigger = NULL;
+ }
+
+ if (fd < 0) /* Disable only */
+ return 0;
+
+ irq->name = kasprintf(GFP_KERNEL, "vfio-irq[%d](%s)",
+ irq->hwirq, vdev->name);
+ if (!irq->name)
+ return -ENOMEM;
+
+ trigger = eventfd_ctx_fdget(fd);
+ if (IS_ERR(trigger)) {
+ kfree(irq->name);
+ return PTR_ERR(trigger);
+ }
+
+ irq->trigger = trigger;
+
+ irq_set_status_flags(irq->hwirq, IRQ_NOAUTOEN);
+ ret = request_irq(irq->hwirq, handler, 0, irq->name, irq);
+ if (ret) {
+ kfree(irq->name);
+ eventfd_ctx_put(trigger);
+ irq->trigger = NULL;
+ return ret;
+ }
+
+ if (!irq->masked)
+ enable_irq(irq->hwirq);
+
+ return 0;
+}
+
+static int vfio_platform_set_irq_trigger(struct vfio_platform_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags,
+ void *data)
+{
+ struct vfio_platform_irq *irq = &vdev->irqs[index];
+ irq_handler_t handler;
+
+ if (vdev->irqs[index].flags & VFIO_IRQ_INFO_AUTOMASKED)
+ handler = vfio_automasked_irq_handler;
+ else
+ handler = vfio_irq_handler;
+
+ if (!count && (flags & VFIO_IRQ_SET_DATA_NONE))
+ return vfio_set_trigger(vdev, index, -1, handler);
+
+ if (start != 0 || count != 1)
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+
+ return vfio_set_trigger(vdev, index, fd, handler);
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ handler(irq->hwirq, irq);
+
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t trigger = *(uint8_t *)data;
+
+ if (trigger)
+ handler(irq->hwirq, irq);
+ }
+
+ return 0;
+}
+
+int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
+ uint32_t flags, unsigned index, unsigned start,
+ unsigned count, void *data)
+{
+ int (*func)(struct vfio_platform_device *vdev, unsigned index,
+ unsigned start, unsigned count, uint32_t flags,
+ void *data) = NULL;
+
+ switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+ case VFIO_IRQ_SET_ACTION_MASK:
+ func = vfio_platform_set_irq_mask;
+ break;
+ case VFIO_IRQ_SET_ACTION_UNMASK:
+ func = vfio_platform_set_irq_unmask;
+ break;
+ case VFIO_IRQ_SET_ACTION_TRIGGER:
+ func = vfio_platform_set_irq_trigger;
+ break;
+ }
+
+ if (!func)
+ return -ENOTTY;
+
+ return func(vdev, index, start, count, flags, data);
+}
+
+int vfio_platform_irq_init(struct vfio_platform_device *vdev)
+{
+ int cnt = 0, i;
+
+ while (vdev->get_irq(vdev, cnt) >= 0)
+ cnt++;
+
+ vdev->irqs = kcalloc(cnt, sizeof(struct vfio_platform_irq), GFP_KERNEL);
+ if (!vdev->irqs)
+ return -ENOMEM;
+
+ for (i = 0; i < cnt; i++) {
+ int hwirq = vdev->get_irq(vdev, i);
+
+ if (hwirq < 0)
+ goto err;
+
+ spin_lock_init(&vdev->irqs[i].lock);
+
+ vdev->irqs[i].flags = VFIO_IRQ_INFO_EVENTFD;
+
+ if (irq_get_trigger_type(hwirq) & IRQ_TYPE_LEVEL_MASK)
+ vdev->irqs[i].flags |= VFIO_IRQ_INFO_MASKABLE
+ | VFIO_IRQ_INFO_AUTOMASKED;
+
+ vdev->irqs[i].count = 1;
+ vdev->irqs[i].hwirq = hwirq;
+ vdev->irqs[i].masked = false;
+ }
+
+ vdev->num_irqs = cnt;
+
+ return 0;
+err:
+ kfree(vdev->irqs);
+ return -EINVAL;
+}
+
+void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev)
+{
+ int i;
+
+ for (i = 0; i < vdev->num_irqs; i++)
+ vfio_set_trigger(vdev, i, -1, NULL);
+
+ vdev->num_irqs = 0;
+ kfree(vdev->irqs);
+}
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
new file mode 100644
index 000000000..5d31e0473
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef VFIO_PLATFORM_PRIVATE_H
+#define VFIO_PLATFORM_PRIVATE_H
+
+#include <linux/types.h>
+#include <linux/interrupt.h>
+
+#define VFIO_PLATFORM_OFFSET_SHIFT 40
+#define VFIO_PLATFORM_OFFSET_MASK (((u64)(1) << VFIO_PLATFORM_OFFSET_SHIFT) - 1)
+
+#define VFIO_PLATFORM_OFFSET_TO_INDEX(off) \
+ (off >> VFIO_PLATFORM_OFFSET_SHIFT)
+
+#define VFIO_PLATFORM_INDEX_TO_OFFSET(index) \
+ ((u64)(index) << VFIO_PLATFORM_OFFSET_SHIFT)
+
+struct vfio_platform_irq {
+ u32 flags;
+ u32 count;
+ int hwirq;
+ char *name;
+ struct eventfd_ctx *trigger;
+ bool masked;
+ spinlock_t lock;
+ struct virqfd *unmask;
+ struct virqfd *mask;
+};
+
+struct vfio_platform_region {
+ u64 addr;
+ resource_size_t size;
+ u32 flags;
+ u32 type;
+#define VFIO_PLATFORM_REGION_TYPE_MMIO 1
+#define VFIO_PLATFORM_REGION_TYPE_PIO 2
+ void __iomem *ioaddr;
+};
+
+struct vfio_platform_device {
+ struct vfio_platform_region *regions;
+ u32 num_regions;
+ struct vfio_platform_irq *irqs;
+ u32 num_irqs;
+ int refcnt;
+ struct mutex igate;
+
+ /*
+ * These fields should be filled by the bus specific binder
+ */
+ void *opaque;
+ const char *name;
+ uint32_t flags;
+ /* callbacks to discover device resources */
+ struct resource*
+ (*get_resource)(struct vfio_platform_device *vdev, int i);
+ int (*get_irq)(struct vfio_platform_device *vdev, int i);
+};
+
+extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
+ struct device *dev);
+extern struct vfio_platform_device *vfio_platform_remove_common
+ (struct device *dev);
+
+extern int vfio_platform_irq_init(struct vfio_platform_device *vdev);
+extern void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev);
+
+extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
+ uint32_t flags, unsigned index,
+ unsigned start, unsigned count,
+ void *data);
+
+#endif /* VFIO_PLATFORM_PRIVATE_H */
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
new file mode 100644
index 000000000..e1278fe04
--- /dev/null
+++ b/drivers/vfio/vfio.c
@@ -0,0 +1,1612 @@
+/*
+ * VFIO core
+ *
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+#include <linux/cdev.h>
+#include <linux/compat.h>
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/anon_inodes.h>
+#include <linux/fs.h>
+#include <linux/idr.h>
+#include <linux/iommu.h>
+#include <linux/list.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/rwsem.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/wait.h>
+
+#define DRIVER_VERSION "0.3"
+#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
+#define DRIVER_DESC "VFIO - User Level meta-driver"
+
+static struct vfio {
+ struct class *class;
+ struct list_head iommu_drivers_list;
+ struct mutex iommu_drivers_lock;
+ struct list_head group_list;
+ struct idr group_idr;
+ struct mutex group_lock;
+ struct cdev group_cdev;
+ dev_t group_devt;
+ wait_queue_head_t release_q;
+} vfio;
+
+struct vfio_iommu_driver {
+ const struct vfio_iommu_driver_ops *ops;
+ struct list_head vfio_next;
+};
+
+struct vfio_container {
+ struct kref kref;
+ struct list_head group_list;
+ struct rw_semaphore group_lock;
+ struct vfio_iommu_driver *iommu_driver;
+ void *iommu_data;
+};
+
+struct vfio_unbound_dev {
+ struct device *dev;
+ struct list_head unbound_next;
+};
+
+struct vfio_group {
+ struct kref kref;
+ int minor;
+ atomic_t container_users;
+ struct iommu_group *iommu_group;
+ struct vfio_container *container;
+ struct list_head device_list;
+ struct mutex device_lock;
+ struct device *dev;
+ struct notifier_block nb;
+ struct list_head vfio_next;
+ struct list_head container_next;
+ struct list_head unbound_list;
+ struct mutex unbound_lock;
+ atomic_t opened;
+};
+
+struct vfio_device {
+ struct kref kref;
+ struct device *dev;
+ const struct vfio_device_ops *ops;
+ struct vfio_group *group;
+ struct list_head group_next;
+ void *device_data;
+};
+
+/**
+ * IOMMU driver registration
+ */
+int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops)
+{
+ struct vfio_iommu_driver *driver, *tmp;
+
+ driver = kzalloc(sizeof(*driver), GFP_KERNEL);
+ if (!driver)
+ return -ENOMEM;
+
+ driver->ops = ops;
+
+ mutex_lock(&vfio.iommu_drivers_lock);
+
+ /* Check for duplicates */
+ list_for_each_entry(tmp, &vfio.iommu_drivers_list, vfio_next) {
+ if (tmp->ops == ops) {
+ mutex_unlock(&vfio.iommu_drivers_lock);
+ kfree(driver);
+ return -EINVAL;
+ }
+ }
+
+ list_add(&driver->vfio_next, &vfio.iommu_drivers_list);
+
+ mutex_unlock(&vfio.iommu_drivers_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vfio_register_iommu_driver);
+
+void vfio_unregister_iommu_driver(const struct vfio_iommu_driver_ops *ops)
+{
+ struct vfio_iommu_driver *driver;
+
+ mutex_lock(&vfio.iommu_drivers_lock);
+ list_for_each_entry(driver, &vfio.iommu_drivers_list, vfio_next) {
+ if (driver->ops == ops) {
+ list_del(&driver->vfio_next);
+ mutex_unlock(&vfio.iommu_drivers_lock);
+ kfree(driver);
+ return;
+ }
+ }
+ mutex_unlock(&vfio.iommu_drivers_lock);
+}
+EXPORT_SYMBOL_GPL(vfio_unregister_iommu_driver);
+
+/**
+ * Group minor allocation/free - both called with vfio.group_lock held
+ */
+static int vfio_alloc_group_minor(struct vfio_group *group)
+{
+ return idr_alloc(&vfio.group_idr, group, 0, MINORMASK + 1, GFP_KERNEL);
+}
+
+static void vfio_free_group_minor(int minor)
+{
+ idr_remove(&vfio.group_idr, minor);
+}
+
+static int vfio_iommu_group_notifier(struct notifier_block *nb,
+ unsigned long action, void *data);
+static void vfio_group_get(struct vfio_group *group);
+
+/**
+ * Container objects - containers are created when /dev/vfio/vfio is
+ * opened, but their lifecycle extends until the last user is done, so
+ * it's freed via kref. Must support container/group/device being
+ * closed in any order.
+ */
+static void vfio_container_get(struct vfio_container *container)
+{
+ kref_get(&container->kref);
+}
+
+static void vfio_container_release(struct kref *kref)
+{
+ struct vfio_container *container;
+ container = container_of(kref, struct vfio_container, kref);
+
+ kfree(container);
+}
+
+static void vfio_container_put(struct vfio_container *container)
+{
+ kref_put(&container->kref, vfio_container_release);
+}
+
+static void vfio_group_unlock_and_free(struct vfio_group *group)
+{
+ mutex_unlock(&vfio.group_lock);
+ /*
+ * Unregister outside of lock. A spurious callback is harmless now
+ * that the group is no longer in vfio.group_list.
+ */
+ iommu_group_unregister_notifier(group->iommu_group, &group->nb);
+ kfree(group);
+}
+
+/**
+ * Group objects - create, release, get, put, search
+ */
+static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group)
+{
+ struct vfio_group *group, *tmp;
+ struct device *dev;
+ int ret, minor;
+
+ group = kzalloc(sizeof(*group), GFP_KERNEL);
+ if (!group)
+ return ERR_PTR(-ENOMEM);
+
+ kref_init(&group->kref);
+ INIT_LIST_HEAD(&group->device_list);
+ mutex_init(&group->device_lock);
+ INIT_LIST_HEAD(&group->unbound_list);
+ mutex_init(&group->unbound_lock);
+ atomic_set(&group->container_users, 0);
+ atomic_set(&group->opened, 0);
+ group->iommu_group = iommu_group;
+
+ group->nb.notifier_call = vfio_iommu_group_notifier;
+
+ /*
+ * blocking notifiers acquire a rwsem around registering and hold
+ * it around callback. Therefore, need to register outside of
+ * vfio.group_lock to avoid A-B/B-A contention. Our callback won't
+ * do anything unless it can find the group in vfio.group_list, so
+ * no harm in registering early.
+ */
+ ret = iommu_group_register_notifier(iommu_group, &group->nb);
+ if (ret) {
+ kfree(group);
+ return ERR_PTR(ret);
+ }
+
+ mutex_lock(&vfio.group_lock);
+
+ /* Did we race creating this group? */
+ list_for_each_entry(tmp, &vfio.group_list, vfio_next) {
+ if (tmp->iommu_group == iommu_group) {
+ vfio_group_get(tmp);
+ vfio_group_unlock_and_free(group);
+ return tmp;
+ }
+ }
+
+ minor = vfio_alloc_group_minor(group);
+ if (minor < 0) {
+ vfio_group_unlock_and_free(group);
+ return ERR_PTR(minor);
+ }
+
+ dev = device_create(vfio.class, NULL,
+ MKDEV(MAJOR(vfio.group_devt), minor),
+ group, "%d", iommu_group_id(iommu_group));
+ if (IS_ERR(dev)) {
+ vfio_free_group_minor(minor);
+ vfio_group_unlock_and_free(group);
+ return (struct vfio_group *)dev; /* ERR_PTR */
+ }
+
+ group->minor = minor;
+ group->dev = dev;
+
+ list_add(&group->vfio_next, &vfio.group_list);
+
+ mutex_unlock(&vfio.group_lock);
+
+ return group;
+}
+
+/* called with vfio.group_lock held */
+static void vfio_group_release(struct kref *kref)
+{
+ struct vfio_group *group = container_of(kref, struct vfio_group, kref);
+ struct vfio_unbound_dev *unbound, *tmp;
+ struct iommu_group *iommu_group = group->iommu_group;
+
+ WARN_ON(!list_empty(&group->device_list));
+
+ list_for_each_entry_safe(unbound, tmp,
+ &group->unbound_list, unbound_next) {
+ list_del(&unbound->unbound_next);
+ kfree(unbound);
+ }
+
+ device_destroy(vfio.class, MKDEV(MAJOR(vfio.group_devt), group->minor));
+ list_del(&group->vfio_next);
+ vfio_free_group_minor(group->minor);
+ vfio_group_unlock_and_free(group);
+ iommu_group_put(iommu_group);
+}
+
+static void vfio_group_put(struct vfio_group *group)
+{
+ kref_put_mutex(&group->kref, vfio_group_release, &vfio.group_lock);
+}
+
+/* Assume group_lock or group reference is held */
+static void vfio_group_get(struct vfio_group *group)
+{
+ kref_get(&group->kref);
+}
+
+/*
+ * Not really a try as we will sleep for mutex, but we need to make
+ * sure the group pointer is valid under lock and get a reference.
+ */
+static struct vfio_group *vfio_group_try_get(struct vfio_group *group)
+{
+ struct vfio_group *target = group;
+
+ mutex_lock(&vfio.group_lock);
+ list_for_each_entry(group, &vfio.group_list, vfio_next) {
+ if (group == target) {
+ vfio_group_get(group);
+ mutex_unlock(&vfio.group_lock);
+ return group;
+ }
+ }
+ mutex_unlock(&vfio.group_lock);
+
+ return NULL;
+}
+
+static
+struct vfio_group *vfio_group_get_from_iommu(struct iommu_group *iommu_group)
+{
+ struct vfio_group *group;
+
+ mutex_lock(&vfio.group_lock);
+ list_for_each_entry(group, &vfio.group_list, vfio_next) {
+ if (group->iommu_group == iommu_group) {
+ vfio_group_get(group);
+ mutex_unlock(&vfio.group_lock);
+ return group;
+ }
+ }
+ mutex_unlock(&vfio.group_lock);
+
+ return NULL;
+}
+
+static struct vfio_group *vfio_group_get_from_minor(int minor)
+{
+ struct vfio_group *group;
+
+ mutex_lock(&vfio.group_lock);
+ group = idr_find(&vfio.group_idr, minor);
+ if (!group) {
+ mutex_unlock(&vfio.group_lock);
+ return NULL;
+ }
+ vfio_group_get(group);
+ mutex_unlock(&vfio.group_lock);
+
+ return group;
+}
+
+/**
+ * Device objects - create, release, get, put, search
+ */
+static
+struct vfio_device *vfio_group_create_device(struct vfio_group *group,
+ struct device *dev,
+ const struct vfio_device_ops *ops,
+ void *device_data)
+{
+ struct vfio_device *device;
+
+ device = kzalloc(sizeof(*device), GFP_KERNEL);
+ if (!device)
+ return ERR_PTR(-ENOMEM);
+
+ kref_init(&device->kref);
+ device->dev = dev;
+ device->group = group;
+ device->ops = ops;
+ device->device_data = device_data;
+ dev_set_drvdata(dev, device);
+
+ /* No need to get group_lock, caller has group reference */
+ vfio_group_get(group);
+
+ mutex_lock(&group->device_lock);
+ list_add(&device->group_next, &group->device_list);
+ mutex_unlock(&group->device_lock);
+
+ return device;
+}
+
+static void vfio_device_release(struct kref *kref)
+{
+ struct vfio_device *device = container_of(kref,
+ struct vfio_device, kref);
+ struct vfio_group *group = device->group;
+
+ list_del(&device->group_next);
+ mutex_unlock(&group->device_lock);
+
+ dev_set_drvdata(device->dev, NULL);
+
+ kfree(device);
+
+ /* vfio_del_group_dev may be waiting for this device */
+ wake_up(&vfio.release_q);
+}
+
+/* Device reference always implies a group reference */
+void vfio_device_put(struct vfio_device *device)
+{
+ struct vfio_group *group = device->group;
+ kref_put_mutex(&device->kref, vfio_device_release, &group->device_lock);
+ vfio_group_put(group);
+}
+EXPORT_SYMBOL_GPL(vfio_device_put);
+
+static void vfio_device_get(struct vfio_device *device)
+{
+ vfio_group_get(device->group);
+ kref_get(&device->kref);
+}
+
+static struct vfio_device *vfio_group_get_device(struct vfio_group *group,
+ struct device *dev)
+{
+ struct vfio_device *device;
+
+ mutex_lock(&group->device_lock);
+ list_for_each_entry(device, &group->device_list, group_next) {
+ if (device->dev == dev) {
+ vfio_device_get(device);
+ mutex_unlock(&group->device_lock);
+ return device;
+ }
+ }
+ mutex_unlock(&group->device_lock);
+ return NULL;
+}
+
+/*
+ * Whitelist some drivers that we know are safe (no dma) or just sit on
+ * a device. It's not always practical to leave a device within a group
+ * driverless as it could get re-bound to something unsafe.
+ */
+static const char * const vfio_driver_whitelist[] = { "pci-stub", "pcieport" };
+
+static bool vfio_whitelisted_driver(struct device_driver *drv)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vfio_driver_whitelist); i++) {
+ if (!strcmp(drv->name, vfio_driver_whitelist[i]))
+ return true;
+ }
+
+ return false;
+}
+
+/*
+ * A vfio group is viable for use by userspace if all devices are in
+ * one of the following states:
+ * - driver-less
+ * - bound to a vfio driver
+ * - bound to a whitelisted driver
+ *
+ * We use two methods to determine whether a device is bound to a vfio
+ * driver. The first is to test whether the device exists in the vfio
+ * group. The second is to test if the device exists on the group
+ * unbound_list, indicating it's in the middle of transitioning from
+ * a vfio driver to driver-less.
+ */
+static int vfio_dev_viable(struct device *dev, void *data)
+{
+ struct vfio_group *group = data;
+ struct vfio_device *device;
+ struct device_driver *drv = ACCESS_ONCE(dev->driver);
+ struct vfio_unbound_dev *unbound;
+ int ret = -EINVAL;
+
+ mutex_lock(&group->unbound_lock);
+ list_for_each_entry(unbound, &group->unbound_list, unbound_next) {
+ if (dev == unbound->dev) {
+ ret = 0;
+ break;
+ }
+ }
+ mutex_unlock(&group->unbound_lock);
+
+ if (!ret || !drv || vfio_whitelisted_driver(drv))
+ return 0;
+
+ device = vfio_group_get_device(group, dev);
+ if (device) {
+ vfio_device_put(device);
+ return 0;
+ }
+
+ return ret;
+}
+
+/**
+ * Async device support
+ */
+static int vfio_group_nb_add_dev(struct vfio_group *group, struct device *dev)
+{
+ struct vfio_device *device;
+
+ /* Do we already know about it? We shouldn't */
+ device = vfio_group_get_device(group, dev);
+ if (WARN_ON_ONCE(device)) {
+ vfio_device_put(device);
+ return 0;
+ }
+
+ /* Nothing to do for idle groups */
+ if (!atomic_read(&group->container_users))
+ return 0;
+
+ /* TODO Prevent device auto probing */
+ WARN("Device %s added to live group %d!\n", dev_name(dev),
+ iommu_group_id(group->iommu_group));
+
+ return 0;
+}
+
+static int vfio_group_nb_verify(struct vfio_group *group, struct device *dev)
+{
+ /* We don't care what happens when the group isn't in use */
+ if (!atomic_read(&group->container_users))
+ return 0;
+
+ return vfio_dev_viable(dev, group);
+}
+
+static int vfio_iommu_group_notifier(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct vfio_group *group = container_of(nb, struct vfio_group, nb);
+ struct device *dev = data;
+ struct vfio_unbound_dev *unbound;
+
+ /*
+ * Need to go through a group_lock lookup to get a reference or we
+ * risk racing a group being removed. Ignore spurious notifies.
+ */
+ group = vfio_group_try_get(group);
+ if (!group)
+ return NOTIFY_OK;
+
+ switch (action) {
+ case IOMMU_GROUP_NOTIFY_ADD_DEVICE:
+ vfio_group_nb_add_dev(group, dev);
+ break;
+ case IOMMU_GROUP_NOTIFY_DEL_DEVICE:
+ /*
+ * Nothing to do here. If the device is in use, then the
+ * vfio sub-driver should block the remove callback until
+ * it is unused. If the device is unused or attached to a
+ * stub driver, then it should be released and we don't
+ * care that it will be going away.
+ */
+ break;
+ case IOMMU_GROUP_NOTIFY_BIND_DRIVER:
+ pr_debug("%s: Device %s, group %d binding to driver\n",
+ __func__, dev_name(dev),
+ iommu_group_id(group->iommu_group));
+ break;
+ case IOMMU_GROUP_NOTIFY_BOUND_DRIVER:
+ pr_debug("%s: Device %s, group %d bound to driver %s\n",
+ __func__, dev_name(dev),
+ iommu_group_id(group->iommu_group), dev->driver->name);
+ BUG_ON(vfio_group_nb_verify(group, dev));
+ break;
+ case IOMMU_GROUP_NOTIFY_UNBIND_DRIVER:
+ pr_debug("%s: Device %s, group %d unbinding from driver %s\n",
+ __func__, dev_name(dev),
+ iommu_group_id(group->iommu_group), dev->driver->name);
+ break;
+ case IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER:
+ pr_debug("%s: Device %s, group %d unbound from driver\n",
+ __func__, dev_name(dev),
+ iommu_group_id(group->iommu_group));
+ /*
+ * XXX An unbound device in a live group is ok, but we'd
+ * really like to avoid the above BUG_ON by preventing other
+ * drivers from binding to it. Once that occurs, we have to
+ * stop the system to maintain isolation. At a minimum, we'd
+ * want a toggle to disable driver auto probe for this device.
+ */
+
+ mutex_lock(&group->unbound_lock);
+ list_for_each_entry(unbound,
+ &group->unbound_list, unbound_next) {
+ if (dev == unbound->dev) {
+ list_del(&unbound->unbound_next);
+ kfree(unbound);
+ break;
+ }
+ }
+ mutex_unlock(&group->unbound_lock);
+ break;
+ }
+
+ vfio_group_put(group);
+ return NOTIFY_OK;
+}
+
+/**
+ * VFIO driver API
+ */
+int vfio_add_group_dev(struct device *dev,
+ const struct vfio_device_ops *ops, void *device_data)
+{
+ struct iommu_group *iommu_group;
+ struct vfio_group *group;
+ struct vfio_device *device;
+
+ iommu_group = iommu_group_get(dev);
+ if (!iommu_group)
+ return -EINVAL;
+
+ group = vfio_group_get_from_iommu(iommu_group);
+ if (!group) {
+ group = vfio_create_group(iommu_group);
+ if (IS_ERR(group)) {
+ iommu_group_put(iommu_group);
+ return PTR_ERR(group);
+ }
+ } else {
+ /*
+ * A found vfio_group already holds a reference to the
+ * iommu_group. A created vfio_group keeps the reference.
+ */
+ iommu_group_put(iommu_group);
+ }
+
+ device = vfio_group_get_device(group, dev);
+ if (device) {
+ WARN(1, "Device %s already exists on group %d\n",
+ dev_name(dev), iommu_group_id(iommu_group));
+ vfio_device_put(device);
+ vfio_group_put(group);
+ return -EBUSY;
+ }
+
+ device = vfio_group_create_device(group, dev, ops, device_data);
+ if (IS_ERR(device)) {
+ vfio_group_put(group);
+ return PTR_ERR(device);
+ }
+
+ /*
+ * Drop all but the vfio_device reference. The vfio_device holds
+ * a reference to the vfio_group, which holds a reference to the
+ * iommu_group.
+ */
+ vfio_group_put(group);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vfio_add_group_dev);
+
+/**
+ * Get a reference to the vfio_device for a device that is known to
+ * be bound to a vfio driver. The driver implicitly holds a
+ * vfio_device reference between vfio_add_group_dev and
+ * vfio_del_group_dev. We can therefore use drvdata to increment
+ * that reference from the struct device. This additional
+ * reference must be released by calling vfio_device_put.
+ */
+struct vfio_device *vfio_device_get_from_dev(struct device *dev)
+{
+ struct vfio_device *device = dev_get_drvdata(dev);
+
+ vfio_device_get(device);
+
+ return device;
+}
+EXPORT_SYMBOL_GPL(vfio_device_get_from_dev);
+
+/*
+ * Caller must hold a reference to the vfio_device
+ */
+void *vfio_device_data(struct vfio_device *device)
+{
+ return device->device_data;
+}
+EXPORT_SYMBOL_GPL(vfio_device_data);
+
+/* Given a referenced group, check if it contains the device */
+static bool vfio_dev_present(struct vfio_group *group, struct device *dev)
+{
+ struct vfio_device *device;
+
+ device = vfio_group_get_device(group, dev);
+ if (!device)
+ return false;
+
+ vfio_device_put(device);
+ return true;
+}
+
+/*
+ * Decrement the device reference count and wait for the device to be
+ * removed. Open file descriptors for the device... */
+void *vfio_del_group_dev(struct device *dev)
+{
+ struct vfio_device *device = dev_get_drvdata(dev);
+ struct vfio_group *group = device->group;
+ void *device_data = device->device_data;
+ struct vfio_unbound_dev *unbound;
+ unsigned int i = 0;
+ long ret;
+ bool interrupted = false;
+
+ /*
+ * The group exists so long as we have a device reference. Get
+ * a group reference and use it to scan for the device going away.
+ */
+ vfio_group_get(group);
+
+ /*
+ * When the device is removed from the group, the group suddenly
+ * becomes non-viable; the device has a driver (until the unbind
+ * completes), but it's not present in the group. This is bad news
+ * for any external users that need to re-acquire a group reference
+ * in order to match and release their existing reference. To
+ * solve this, we track such devices on the unbound_list to bridge
+ * the gap until they're fully unbound.
+ */
+ unbound = kzalloc(sizeof(*unbound), GFP_KERNEL);
+ if (unbound) {
+ unbound->dev = dev;
+ mutex_lock(&group->unbound_lock);
+ list_add(&unbound->unbound_next, &group->unbound_list);
+ mutex_unlock(&group->unbound_lock);
+ }
+ WARN_ON(!unbound);
+
+ vfio_device_put(device);
+
+ /*
+ * If the device is still present in the group after the above
+ * 'put', then it is in use and we need to request it from the
+ * bus driver. The driver may in turn need to request the
+ * device from the user. We send the request on an arbitrary
+ * interval with counter to allow the driver to take escalating
+ * measures to release the device if it has the ability to do so.
+ */
+ do {
+ device = vfio_group_get_device(group, dev);
+ if (!device)
+ break;
+
+ if (device->ops->request)
+ device->ops->request(device_data, i++);
+
+ vfio_device_put(device);
+
+ if (interrupted) {
+ ret = wait_event_timeout(vfio.release_q,
+ !vfio_dev_present(group, dev), HZ * 10);
+ } else {
+ ret = wait_event_interruptible_timeout(vfio.release_q,
+ !vfio_dev_present(group, dev), HZ * 10);
+ if (ret == -ERESTARTSYS) {
+ interrupted = true;
+ dev_warn(dev,
+ "Device is currently in use, task"
+ " \"%s\" (%d) "
+ "blocked until device is released",
+ current->comm, task_pid_nr(current));
+ }
+ }
+ } while (ret <= 0);
+
+ vfio_group_put(group);
+
+ return device_data;
+}
+EXPORT_SYMBOL_GPL(vfio_del_group_dev);
+
+/**
+ * VFIO base fd, /dev/vfio/vfio
+ */
+static long vfio_ioctl_check_extension(struct vfio_container *container,
+ unsigned long arg)
+{
+ struct vfio_iommu_driver *driver;
+ long ret = 0;
+
+ down_read(&container->group_lock);
+
+ driver = container->iommu_driver;
+
+ switch (arg) {
+ /* No base extensions yet */
+ default:
+ /*
+ * If no driver is set, poll all registered drivers for
+ * extensions and return the first positive result. If
+ * a driver is already set, further queries will be passed
+ * only to that driver.
+ */
+ if (!driver) {
+ mutex_lock(&vfio.iommu_drivers_lock);
+ list_for_each_entry(driver, &vfio.iommu_drivers_list,
+ vfio_next) {
+ if (!try_module_get(driver->ops->owner))
+ continue;
+
+ ret = driver->ops->ioctl(NULL,
+ VFIO_CHECK_EXTENSION,
+ arg);
+ module_put(driver->ops->owner);
+ if (ret > 0)
+ break;
+ }
+ mutex_unlock(&vfio.iommu_drivers_lock);
+ } else
+ ret = driver->ops->ioctl(container->iommu_data,
+ VFIO_CHECK_EXTENSION, arg);
+ }
+
+ up_read(&container->group_lock);
+
+ return ret;
+}
+
+/* hold write lock on container->group_lock */
+static int __vfio_container_attach_groups(struct vfio_container *container,
+ struct vfio_iommu_driver *driver,
+ void *data)
+{
+ struct vfio_group *group;
+ int ret = -ENODEV;
+
+ list_for_each_entry(group, &container->group_list, container_next) {
+ ret = driver->ops->attach_group(data, group->iommu_group);
+ if (ret)
+ goto unwind;
+ }
+
+ return ret;
+
+unwind:
+ list_for_each_entry_continue_reverse(group, &container->group_list,
+ container_next) {
+ driver->ops->detach_group(data, group->iommu_group);
+ }
+
+ return ret;
+}
+
+static long vfio_ioctl_set_iommu(struct vfio_container *container,
+ unsigned long arg)
+{
+ struct vfio_iommu_driver *driver;
+ long ret = -ENODEV;
+
+ down_write(&container->group_lock);
+
+ /*
+ * The container is designed to be an unprivileged interface while
+ * the group can be assigned to specific users. Therefore, only by
+ * adding a group to a container does the user get the privilege of
+ * enabling the iommu, which may allocate finite resources. There
+ * is no unset_iommu, but by removing all the groups from a container,
+ * the container is deprivileged and returns to an unset state.
+ */
+ if (list_empty(&container->group_list) || container->iommu_driver) {
+ up_write(&container->group_lock);
+ return -EINVAL;
+ }
+
+ mutex_lock(&vfio.iommu_drivers_lock);
+ list_for_each_entry(driver, &vfio.iommu_drivers_list, vfio_next) {
+ void *data;
+
+ if (!try_module_get(driver->ops->owner))
+ continue;
+
+ /*
+ * The arg magic for SET_IOMMU is the same as CHECK_EXTENSION,
+ * so test which iommu driver reported support for this
+ * extension and call open on them. We also pass them the
+ * magic, allowing a single driver to support multiple
+ * interfaces if they'd like.
+ */
+ if (driver->ops->ioctl(NULL, VFIO_CHECK_EXTENSION, arg) <= 0) {
+ module_put(driver->ops->owner);
+ continue;
+ }
+
+ /* module reference holds the driver we're working on */
+ mutex_unlock(&vfio.iommu_drivers_lock);
+
+ data = driver->ops->open(arg);
+ if (IS_ERR(data)) {
+ ret = PTR_ERR(data);
+ module_put(driver->ops->owner);
+ goto skip_drivers_unlock;
+ }
+
+ ret = __vfio_container_attach_groups(container, driver, data);
+ if (!ret) {
+ container->iommu_driver = driver;
+ container->iommu_data = data;
+ } else {
+ driver->ops->release(data);
+ module_put(driver->ops->owner);
+ }
+
+ goto skip_drivers_unlock;
+ }
+
+ mutex_unlock(&vfio.iommu_drivers_lock);
+skip_drivers_unlock:
+ up_write(&container->group_lock);
+
+ return ret;
+}
+
+static long vfio_fops_unl_ioctl(struct file *filep,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_container *container = filep->private_data;
+ struct vfio_iommu_driver *driver;
+ void *data;
+ long ret = -EINVAL;
+
+ if (!container)
+ return ret;
+
+ switch (cmd) {
+ case VFIO_GET_API_VERSION:
+ ret = VFIO_API_VERSION;
+ break;
+ case VFIO_CHECK_EXTENSION:
+ ret = vfio_ioctl_check_extension(container, arg);
+ break;
+ case VFIO_SET_IOMMU:
+ ret = vfio_ioctl_set_iommu(container, arg);
+ break;
+ default:
+ down_read(&container->group_lock);
+
+ driver = container->iommu_driver;
+ data = container->iommu_data;
+
+ if (driver) /* passthrough all unrecognized ioctls */
+ ret = driver->ops->ioctl(data, cmd, arg);
+
+ up_read(&container->group_lock);
+ }
+
+ return ret;
+}
+
+#ifdef CONFIG_COMPAT
+static long vfio_fops_compat_ioctl(struct file *filep,
+ unsigned int cmd, unsigned long arg)
+{
+ arg = (unsigned long)compat_ptr(arg);
+ return vfio_fops_unl_ioctl(filep, cmd, arg);
+}
+#endif /* CONFIG_COMPAT */
+
+static int vfio_fops_open(struct inode *inode, struct file *filep)
+{
+ struct vfio_container *container;
+
+ container = kzalloc(sizeof(*container), GFP_KERNEL);
+ if (!container)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&container->group_list);
+ init_rwsem(&container->group_lock);
+ kref_init(&container->kref);
+
+ filep->private_data = container;
+
+ return 0;
+}
+
+static int vfio_fops_release(struct inode *inode, struct file *filep)
+{
+ struct vfio_container *container = filep->private_data;
+
+ filep->private_data = NULL;
+
+ vfio_container_put(container);
+
+ return 0;
+}
+
+/*
+ * Once an iommu driver is set, we optionally pass read/write/mmap
+ * on to the driver, allowing management interfaces beyond ioctl.
+ */
+static ssize_t vfio_fops_read(struct file *filep, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_container *container = filep->private_data;
+ struct vfio_iommu_driver *driver;
+ ssize_t ret = -EINVAL;
+
+ down_read(&container->group_lock);
+
+ driver = container->iommu_driver;
+ if (likely(driver && driver->ops->read))
+ ret = driver->ops->read(container->iommu_data,
+ buf, count, ppos);
+
+ up_read(&container->group_lock);
+
+ return ret;
+}
+
+static ssize_t vfio_fops_write(struct file *filep, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_container *container = filep->private_data;
+ struct vfio_iommu_driver *driver;
+ ssize_t ret = -EINVAL;
+
+ down_read(&container->group_lock);
+
+ driver = container->iommu_driver;
+ if (likely(driver && driver->ops->write))
+ ret = driver->ops->write(container->iommu_data,
+ buf, count, ppos);
+
+ up_read(&container->group_lock);
+
+ return ret;
+}
+
+static int vfio_fops_mmap(struct file *filep, struct vm_area_struct *vma)
+{
+ struct vfio_container *container = filep->private_data;
+ struct vfio_iommu_driver *driver;
+ int ret = -EINVAL;
+
+ down_read(&container->group_lock);
+
+ driver = container->iommu_driver;
+ if (likely(driver && driver->ops->mmap))
+ ret = driver->ops->mmap(container->iommu_data, vma);
+
+ up_read(&container->group_lock);
+
+ return ret;
+}
+
+static const struct file_operations vfio_fops = {
+ .owner = THIS_MODULE,
+ .open = vfio_fops_open,
+ .release = vfio_fops_release,
+ .read = vfio_fops_read,
+ .write = vfio_fops_write,
+ .unlocked_ioctl = vfio_fops_unl_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = vfio_fops_compat_ioctl,
+#endif
+ .mmap = vfio_fops_mmap,
+};
+
+/**
+ * VFIO Group fd, /dev/vfio/$GROUP
+ */
+static void __vfio_group_unset_container(struct vfio_group *group)
+{
+ struct vfio_container *container = group->container;
+ struct vfio_iommu_driver *driver;
+
+ down_write(&container->group_lock);
+
+ driver = container->iommu_driver;
+ if (driver)
+ driver->ops->detach_group(container->iommu_data,
+ group->iommu_group);
+
+ group->container = NULL;
+ list_del(&group->container_next);
+
+ /* Detaching the last group deprivileges a container, remove iommu */
+ if (driver && list_empty(&container->group_list)) {
+ driver->ops->release(container->iommu_data);
+ module_put(driver->ops->owner);
+ container->iommu_driver = NULL;
+ container->iommu_data = NULL;
+ }
+
+ up_write(&container->group_lock);
+
+ vfio_container_put(container);
+}
+
+/*
+ * VFIO_GROUP_UNSET_CONTAINER should fail if there are other users or
+ * if there was no container to unset. Since the ioctl is called on
+ * the group, we know that still exists, therefore the only valid
+ * transition here is 1->0.
+ */
+static int vfio_group_unset_container(struct vfio_group *group)
+{
+ int users = atomic_cmpxchg(&group->container_users, 1, 0);
+
+ if (!users)
+ return -EINVAL;
+ if (users != 1)
+ return -EBUSY;
+
+ __vfio_group_unset_container(group);
+
+ return 0;
+}
+
+/*
+ * When removing container users, anything that removes the last user
+ * implicitly removes the group from the container. That is, if the
+ * group file descriptor is closed, as well as any device file descriptors,
+ * the group is free.
+ */
+static void vfio_group_try_dissolve_container(struct vfio_group *group)
+{
+ if (0 == atomic_dec_if_positive(&group->container_users))
+ __vfio_group_unset_container(group);
+}
+
+static int vfio_group_set_container(struct vfio_group *group, int container_fd)
+{
+ struct fd f;
+ struct vfio_container *container;
+ struct vfio_iommu_driver *driver;
+ int ret = 0;
+
+ if (atomic_read(&group->container_users))
+ return -EINVAL;
+
+ f = fdget(container_fd);
+ if (!f.file)
+ return -EBADF;
+
+ /* Sanity check, is this really our fd? */
+ if (f.file->f_op != &vfio_fops) {
+ fdput(f);
+ return -EINVAL;
+ }
+
+ container = f.file->private_data;
+ WARN_ON(!container); /* fget ensures we don't race vfio_release */
+
+ down_write(&container->group_lock);
+
+ driver = container->iommu_driver;
+ if (driver) {
+ ret = driver->ops->attach_group(container->iommu_data,
+ group->iommu_group);
+ if (ret)
+ goto unlock_out;
+ }
+
+ group->container = container;
+ list_add(&group->container_next, &container->group_list);
+
+ /* Get a reference on the container and mark a user within the group */
+ vfio_container_get(container);
+ atomic_inc(&group->container_users);
+
+unlock_out:
+ up_write(&container->group_lock);
+ fdput(f);
+ return ret;
+}
+
+static bool vfio_group_viable(struct vfio_group *group)
+{
+ return (iommu_group_for_each_dev(group->iommu_group,
+ group, vfio_dev_viable) == 0);
+}
+
+static const struct file_operations vfio_device_fops;
+
+static int vfio_group_get_device_fd(struct vfio_group *group, char *buf)
+{
+ struct vfio_device *device;
+ struct file *filep;
+ int ret = -ENODEV;
+
+ if (0 == atomic_read(&group->container_users) ||
+ !group->container->iommu_driver || !vfio_group_viable(group))
+ return -EINVAL;
+
+ mutex_lock(&group->device_lock);
+ list_for_each_entry(device, &group->device_list, group_next) {
+ if (strcmp(dev_name(device->dev), buf))
+ continue;
+
+ ret = device->ops->open(device->device_data);
+ if (ret)
+ break;
+ /*
+ * We can't use anon_inode_getfd() because we need to modify
+ * the f_mode flags directly to allow more than just ioctls
+ */
+ ret = get_unused_fd_flags(O_CLOEXEC);
+ if (ret < 0) {
+ device->ops->release(device->device_data);
+ break;
+ }
+
+ filep = anon_inode_getfile("[vfio-device]", &vfio_device_fops,
+ device, O_RDWR);
+ if (IS_ERR(filep)) {
+ put_unused_fd(ret);
+ ret = PTR_ERR(filep);
+ device->ops->release(device->device_data);
+ break;
+ }
+
+ /*
+ * TODO: add an anon_inode interface to do this.
+ * Appears to be missing by lack of need rather than
+ * explicitly prevented. Now there's need.
+ */
+ filep->f_mode |= (FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
+
+ vfio_device_get(device);
+ atomic_inc(&group->container_users);
+
+ fd_install(ret, filep);
+ break;
+ }
+ mutex_unlock(&group->device_lock);
+
+ return ret;
+}
+
+static long vfio_group_fops_unl_ioctl(struct file *filep,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_group *group = filep->private_data;
+ long ret = -ENOTTY;
+
+ switch (cmd) {
+ case VFIO_GROUP_GET_STATUS:
+ {
+ struct vfio_group_status status;
+ unsigned long minsz;
+
+ minsz = offsetofend(struct vfio_group_status, flags);
+
+ if (copy_from_user(&status, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (status.argsz < minsz)
+ return -EINVAL;
+
+ status.flags = 0;
+
+ if (vfio_group_viable(group))
+ status.flags |= VFIO_GROUP_FLAGS_VIABLE;
+
+ if (group->container)
+ status.flags |= VFIO_GROUP_FLAGS_CONTAINER_SET;
+
+ if (copy_to_user((void __user *)arg, &status, minsz))
+ return -EFAULT;
+
+ ret = 0;
+ break;
+ }
+ case VFIO_GROUP_SET_CONTAINER:
+ {
+ int fd;
+
+ if (get_user(fd, (int __user *)arg))
+ return -EFAULT;
+
+ if (fd < 0)
+ return -EINVAL;
+
+ ret = vfio_group_set_container(group, fd);
+ break;
+ }
+ case VFIO_GROUP_UNSET_CONTAINER:
+ ret = vfio_group_unset_container(group);
+ break;
+ case VFIO_GROUP_GET_DEVICE_FD:
+ {
+ char *buf;
+
+ buf = strndup_user((const char __user *)arg, PAGE_SIZE);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ ret = vfio_group_get_device_fd(group, buf);
+ kfree(buf);
+ break;
+ }
+ }
+
+ return ret;
+}
+
+#ifdef CONFIG_COMPAT
+static long vfio_group_fops_compat_ioctl(struct file *filep,
+ unsigned int cmd, unsigned long arg)
+{
+ arg = (unsigned long)compat_ptr(arg);
+ return vfio_group_fops_unl_ioctl(filep, cmd, arg);
+}
+#endif /* CONFIG_COMPAT */
+
+static int vfio_group_fops_open(struct inode *inode, struct file *filep)
+{
+ struct vfio_group *group;
+ int opened;
+
+ group = vfio_group_get_from_minor(iminor(inode));
+ if (!group)
+ return -ENODEV;
+
+ /* Do we need multiple instances of the group open? Seems not. */
+ opened = atomic_cmpxchg(&group->opened, 0, 1);
+ if (opened) {
+ vfio_group_put(group);
+ return -EBUSY;
+ }
+
+ /* Is something still in use from a previous open? */
+ if (group->container) {
+ atomic_dec(&group->opened);
+ vfio_group_put(group);
+ return -EBUSY;
+ }
+
+ filep->private_data = group;
+
+ return 0;
+}
+
+static int vfio_group_fops_release(struct inode *inode, struct file *filep)
+{
+ struct vfio_group *group = filep->private_data;
+
+ filep->private_data = NULL;
+
+ vfio_group_try_dissolve_container(group);
+
+ atomic_dec(&group->opened);
+
+ vfio_group_put(group);
+
+ return 0;
+}
+
+static const struct file_operations vfio_group_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = vfio_group_fops_unl_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = vfio_group_fops_compat_ioctl,
+#endif
+ .open = vfio_group_fops_open,
+ .release = vfio_group_fops_release,
+};
+
+/**
+ * VFIO Device fd
+ */
+static int vfio_device_fops_release(struct inode *inode, struct file *filep)
+{
+ struct vfio_device *device = filep->private_data;
+
+ device->ops->release(device->device_data);
+
+ vfio_group_try_dissolve_container(device->group);
+
+ vfio_device_put(device);
+
+ return 0;
+}
+
+static long vfio_device_fops_unl_ioctl(struct file *filep,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_device *device = filep->private_data;
+
+ if (unlikely(!device->ops->ioctl))
+ return -EINVAL;
+
+ return device->ops->ioctl(device->device_data, cmd, arg);
+}
+
+static ssize_t vfio_device_fops_read(struct file *filep, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_device *device = filep->private_data;
+
+ if (unlikely(!device->ops->read))
+ return -EINVAL;
+
+ return device->ops->read(device->device_data, buf, count, ppos);
+}
+
+static ssize_t vfio_device_fops_write(struct file *filep,
+ const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_device *device = filep->private_data;
+
+ if (unlikely(!device->ops->write))
+ return -EINVAL;
+
+ return device->ops->write(device->device_data, buf, count, ppos);
+}
+
+static int vfio_device_fops_mmap(struct file *filep, struct vm_area_struct *vma)
+{
+ struct vfio_device *device = filep->private_data;
+
+ if (unlikely(!device->ops->mmap))
+ return -EINVAL;
+
+ return device->ops->mmap(device->device_data, vma);
+}
+
+#ifdef CONFIG_COMPAT
+static long vfio_device_fops_compat_ioctl(struct file *filep,
+ unsigned int cmd, unsigned long arg)
+{
+ arg = (unsigned long)compat_ptr(arg);
+ return vfio_device_fops_unl_ioctl(filep, cmd, arg);
+}
+#endif /* CONFIG_COMPAT */
+
+static const struct file_operations vfio_device_fops = {
+ .owner = THIS_MODULE,
+ .release = vfio_device_fops_release,
+ .read = vfio_device_fops_read,
+ .write = vfio_device_fops_write,
+ .unlocked_ioctl = vfio_device_fops_unl_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = vfio_device_fops_compat_ioctl,
+#endif
+ .mmap = vfio_device_fops_mmap,
+};
+
+/**
+ * External user API, exported by symbols to be linked dynamically.
+ *
+ * The protocol includes:
+ * 1. do normal VFIO init operation:
+ * - opening a new container;
+ * - attaching group(s) to it;
+ * - setting an IOMMU driver for a container.
+ * When IOMMU is set for a container, all groups in it are
+ * considered ready to use by an external user.
+ *
+ * 2. User space passes a group fd to an external user.
+ * The external user calls vfio_group_get_external_user()
+ * to verify that:
+ * - the group is initialized;
+ * - IOMMU is set for it.
+ * If both checks passed, vfio_group_get_external_user()
+ * increments the container user counter to prevent
+ * the VFIO group from disposal before KVM exits.
+ *
+ * 3. The external user calls vfio_external_user_iommu_id()
+ * to know an IOMMU ID.
+ *
+ * 4. When the external KVM finishes, it calls
+ * vfio_group_put_external_user() to release the VFIO group.
+ * This call decrements the container user counter.
+ */
+struct vfio_group *vfio_group_get_external_user(struct file *filep)
+{
+ struct vfio_group *group = filep->private_data;
+
+ if (filep->f_op != &vfio_group_fops)
+ return ERR_PTR(-EINVAL);
+
+ if (!atomic_inc_not_zero(&group->container_users))
+ return ERR_PTR(-EINVAL);
+
+ if (!group->container->iommu_driver ||
+ !vfio_group_viable(group)) {
+ atomic_dec(&group->container_users);
+ return ERR_PTR(-EINVAL);
+ }
+
+ vfio_group_get(group);
+
+ return group;
+}
+EXPORT_SYMBOL_GPL(vfio_group_get_external_user);
+
+void vfio_group_put_external_user(struct vfio_group *group)
+{
+ vfio_group_put(group);
+ vfio_group_try_dissolve_container(group);
+}
+EXPORT_SYMBOL_GPL(vfio_group_put_external_user);
+
+int vfio_external_user_iommu_id(struct vfio_group *group)
+{
+ return iommu_group_id(group->iommu_group);
+}
+EXPORT_SYMBOL_GPL(vfio_external_user_iommu_id);
+
+long vfio_external_check_extension(struct vfio_group *group, unsigned long arg)
+{
+ return vfio_ioctl_check_extension(group->container, arg);
+}
+EXPORT_SYMBOL_GPL(vfio_external_check_extension);
+
+/**
+ * Module/class support
+ */
+static char *vfio_devnode(struct device *dev, umode_t *mode)
+{
+ return kasprintf(GFP_KERNEL, "vfio/%s", dev_name(dev));
+}
+
+static struct miscdevice vfio_dev = {
+ .minor = VFIO_MINOR,
+ .name = "vfio",
+ .fops = &vfio_fops,
+ .nodename = "vfio/vfio",
+ .mode = S_IRUGO | S_IWUGO,
+};
+
+static int __init vfio_init(void)
+{
+ int ret;
+
+ idr_init(&vfio.group_idr);
+ mutex_init(&vfio.group_lock);
+ mutex_init(&vfio.iommu_drivers_lock);
+ INIT_LIST_HEAD(&vfio.group_list);
+ INIT_LIST_HEAD(&vfio.iommu_drivers_list);
+ init_waitqueue_head(&vfio.release_q);
+
+ ret = misc_register(&vfio_dev);
+ if (ret) {
+ pr_err("vfio: misc device register failed\n");
+ return ret;
+ }
+
+ /* /dev/vfio/$GROUP */
+ vfio.class = class_create(THIS_MODULE, "vfio");
+ if (IS_ERR(vfio.class)) {
+ ret = PTR_ERR(vfio.class);
+ goto err_class;
+ }
+
+ vfio.class->devnode = vfio_devnode;
+
+ ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK, "vfio");
+ if (ret)
+ goto err_alloc_chrdev;
+
+ cdev_init(&vfio.group_cdev, &vfio_group_fops);
+ ret = cdev_add(&vfio.group_cdev, vfio.group_devt, MINORMASK);
+ if (ret)
+ goto err_cdev_add;
+
+ pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+
+ /*
+ * Attempt to load known iommu-drivers. This gives us a working
+ * environment without the user needing to explicitly load iommu
+ * drivers.
+ */
+ request_module_nowait("vfio_iommu_type1");
+ request_module_nowait("vfio_iommu_spapr_tce");
+
+ return 0;
+
+err_cdev_add:
+ unregister_chrdev_region(vfio.group_devt, MINORMASK);
+err_alloc_chrdev:
+ class_destroy(vfio.class);
+ vfio.class = NULL;
+err_class:
+ misc_deregister(&vfio_dev);
+ return ret;
+}
+
+static void __exit vfio_cleanup(void)
+{
+ WARN_ON(!list_empty(&vfio.group_list));
+
+ idr_destroy(&vfio.group_idr);
+ cdev_del(&vfio.group_cdev);
+ unregister_chrdev_region(vfio.group_devt, MINORMASK);
+ class_destroy(vfio.class);
+ vfio.class = NULL;
+ misc_deregister(&vfio_dev);
+}
+
+module_init(vfio_init);
+module_exit(vfio_cleanup);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS_MISCDEV(VFIO_MINOR);
+MODULE_ALIAS("devname:vfio/vfio");
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
new file mode 100644
index 000000000..730b4ef3e
--- /dev/null
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -0,0 +1,392 @@
+/*
+ * VFIO: IOMMU DMA mapping support for TCE on POWER
+ *
+ * Copyright (C) 2013 IBM Corp. All rights reserved.
+ * Author: Alexey Kardashevskiy <aik@ozlabs.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from original vfio_iommu_type1.c:
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/err.h>
+#include <linux/vfio.h>
+#include <asm/iommu.h>
+#include <asm/tce.h>
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "aik@ozlabs.ru"
+#define DRIVER_DESC "VFIO IOMMU SPAPR TCE"
+
+static void tce_iommu_detach_group(void *iommu_data,
+ struct iommu_group *iommu_group);
+
+/*
+ * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation
+ *
+ * This code handles mapping and unmapping of user data buffers
+ * into DMA'ble space using the IOMMU
+ */
+
+/*
+ * The container descriptor supports only a single group per container.
+ * Required by the API as the container is not supplied with the IOMMU group
+ * at the moment of initialization.
+ */
+struct tce_container {
+ struct mutex lock;
+ struct iommu_table *tbl;
+ bool enabled;
+};
+
+static int tce_iommu_enable(struct tce_container *container)
+{
+ int ret = 0;
+ unsigned long locked, lock_limit, npages;
+ struct iommu_table *tbl = container->tbl;
+
+ if (!container->tbl)
+ return -ENXIO;
+
+ if (!current->mm)
+ return -ESRCH; /* process exited */
+
+ if (container->enabled)
+ return -EBUSY;
+
+ /*
+ * When userspace pages are mapped into the IOMMU, they are effectively
+ * locked memory, so, theoretically, we need to update the accounting
+ * of locked pages on each map and unmap. For powerpc, the map unmap
+ * paths can be very hot, though, and the accounting would kill
+ * performance, especially since it would be difficult to impossible
+ * to handle the accounting in real mode only.
+ *
+ * To address that, rather than precisely accounting every page, we
+ * instead account for a worst case on locked memory when the iommu is
+ * enabled and disabled. The worst case upper bound on locked memory
+ * is the size of the whole iommu window, which is usually relatively
+ * small (compared to total memory sizes) on POWER hardware.
+ *
+ * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits,
+ * that would effectively kill the guest at random points, much better
+ * enforcing the limit based on the max that the guest can map.
+ */
+ down_write(&current->mm->mmap_sem);
+ npages = (tbl->it_size << IOMMU_PAGE_SHIFT_4K) >> PAGE_SHIFT;
+ locked = current->mm->locked_vm + npages;
+ lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
+ pr_warn("RLIMIT_MEMLOCK (%ld) exceeded\n",
+ rlimit(RLIMIT_MEMLOCK));
+ ret = -ENOMEM;
+ } else {
+
+ current->mm->locked_vm += npages;
+ container->enabled = true;
+ }
+ up_write(&current->mm->mmap_sem);
+
+ return ret;
+}
+
+static void tce_iommu_disable(struct tce_container *container)
+{
+ if (!container->enabled)
+ return;
+
+ container->enabled = false;
+
+ if (!container->tbl || !current->mm)
+ return;
+
+ down_write(&current->mm->mmap_sem);
+ current->mm->locked_vm -= (container->tbl->it_size <<
+ IOMMU_PAGE_SHIFT_4K) >> PAGE_SHIFT;
+ up_write(&current->mm->mmap_sem);
+}
+
+static void *tce_iommu_open(unsigned long arg)
+{
+ struct tce_container *container;
+
+ if (arg != VFIO_SPAPR_TCE_IOMMU) {
+ pr_err("tce_vfio: Wrong IOMMU type\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ container = kzalloc(sizeof(*container), GFP_KERNEL);
+ if (!container)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&container->lock);
+
+ return container;
+}
+
+static void tce_iommu_release(void *iommu_data)
+{
+ struct tce_container *container = iommu_data;
+
+ WARN_ON(container->tbl && !container->tbl->it_group);
+ tce_iommu_disable(container);
+
+ if (container->tbl && container->tbl->it_group)
+ tce_iommu_detach_group(iommu_data, container->tbl->it_group);
+
+ mutex_destroy(&container->lock);
+
+ kfree(container);
+}
+
+static long tce_iommu_ioctl(void *iommu_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct tce_container *container = iommu_data;
+ unsigned long minsz;
+ long ret;
+
+ switch (cmd) {
+ case VFIO_CHECK_EXTENSION:
+ switch (arg) {
+ case VFIO_SPAPR_TCE_IOMMU:
+ ret = 1;
+ break;
+ default:
+ ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg);
+ break;
+ }
+
+ return (ret < 0) ? 0 : ret;
+
+ case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
+ struct vfio_iommu_spapr_tce_info info;
+ struct iommu_table *tbl = container->tbl;
+
+ if (WARN_ON(!tbl))
+ return -ENXIO;
+
+ minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
+ dma32_window_size);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ info.dma32_window_start = tbl->it_offset << IOMMU_PAGE_SHIFT_4K;
+ info.dma32_window_size = tbl->it_size << IOMMU_PAGE_SHIFT_4K;
+ info.flags = 0;
+
+ if (copy_to_user((void __user *)arg, &info, minsz))
+ return -EFAULT;
+
+ return 0;
+ }
+ case VFIO_IOMMU_MAP_DMA: {
+ struct vfio_iommu_type1_dma_map param;
+ struct iommu_table *tbl = container->tbl;
+ unsigned long tce, i;
+
+ if (!tbl)
+ return -ENXIO;
+
+ BUG_ON(!tbl->it_group);
+
+ minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
+
+ if (copy_from_user(&param, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (param.argsz < minsz)
+ return -EINVAL;
+
+ if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ |
+ VFIO_DMA_MAP_FLAG_WRITE))
+ return -EINVAL;
+
+ if ((param.size & ~IOMMU_PAGE_MASK_4K) ||
+ (param.vaddr & ~IOMMU_PAGE_MASK_4K))
+ return -EINVAL;
+
+ /* iova is checked by the IOMMU API */
+ tce = param.vaddr;
+ if (param.flags & VFIO_DMA_MAP_FLAG_READ)
+ tce |= TCE_PCI_READ;
+ if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
+ tce |= TCE_PCI_WRITE;
+
+ ret = iommu_tce_put_param_check(tbl, param.iova, tce);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < (param.size >> IOMMU_PAGE_SHIFT_4K); ++i) {
+ ret = iommu_put_tce_user_mode(tbl,
+ (param.iova >> IOMMU_PAGE_SHIFT_4K) + i,
+ tce);
+ if (ret)
+ break;
+ tce += IOMMU_PAGE_SIZE_4K;
+ }
+ if (ret)
+ iommu_clear_tces_and_put_pages(tbl,
+ param.iova >> IOMMU_PAGE_SHIFT_4K, i);
+
+ iommu_flush_tce(tbl);
+
+ return ret;
+ }
+ case VFIO_IOMMU_UNMAP_DMA: {
+ struct vfio_iommu_type1_dma_unmap param;
+ struct iommu_table *tbl = container->tbl;
+
+ if (WARN_ON(!tbl))
+ return -ENXIO;
+
+ minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
+ size);
+
+ if (copy_from_user(&param, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (param.argsz < minsz)
+ return -EINVAL;
+
+ /* No flag is supported now */
+ if (param.flags)
+ return -EINVAL;
+
+ if (param.size & ~IOMMU_PAGE_MASK_4K)
+ return -EINVAL;
+
+ ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
+ param.size >> IOMMU_PAGE_SHIFT_4K);
+ if (ret)
+ return ret;
+
+ ret = iommu_clear_tces_and_put_pages(tbl,
+ param.iova >> IOMMU_PAGE_SHIFT_4K,
+ param.size >> IOMMU_PAGE_SHIFT_4K);
+ iommu_flush_tce(tbl);
+
+ return ret;
+ }
+ case VFIO_IOMMU_ENABLE:
+ mutex_lock(&container->lock);
+ ret = tce_iommu_enable(container);
+ mutex_unlock(&container->lock);
+ return ret;
+
+
+ case VFIO_IOMMU_DISABLE:
+ mutex_lock(&container->lock);
+ tce_iommu_disable(container);
+ mutex_unlock(&container->lock);
+ return 0;
+ case VFIO_EEH_PE_OP:
+ if (!container->tbl || !container->tbl->it_group)
+ return -ENODEV;
+
+ return vfio_spapr_iommu_eeh_ioctl(container->tbl->it_group,
+ cmd, arg);
+ }
+
+ return -ENOTTY;
+}
+
+static int tce_iommu_attach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+ int ret;
+ struct tce_container *container = iommu_data;
+ struct iommu_table *tbl = iommu_group_get_iommudata(iommu_group);
+
+ BUG_ON(!tbl);
+ mutex_lock(&container->lock);
+
+ /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
+ iommu_group_id(iommu_group), iommu_group); */
+ if (container->tbl) {
+ pr_warn("tce_vfio: Only one group per IOMMU container is allowed, existing id=%d, attaching id=%d\n",
+ iommu_group_id(container->tbl->it_group),
+ iommu_group_id(iommu_group));
+ ret = -EBUSY;
+ } else if (container->enabled) {
+ pr_err("tce_vfio: attaching group #%u to enabled container\n",
+ iommu_group_id(iommu_group));
+ ret = -EBUSY;
+ } else {
+ ret = iommu_take_ownership(tbl);
+ if (!ret)
+ container->tbl = tbl;
+ }
+
+ mutex_unlock(&container->lock);
+
+ return ret;
+}
+
+static void tce_iommu_detach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+ struct tce_container *container = iommu_data;
+ struct iommu_table *tbl = iommu_group_get_iommudata(iommu_group);
+
+ BUG_ON(!tbl);
+ mutex_lock(&container->lock);
+ if (tbl != container->tbl) {
+ pr_warn("tce_vfio: detaching group #%u, expected group is #%u\n",
+ iommu_group_id(iommu_group),
+ iommu_group_id(tbl->it_group));
+ } else {
+ if (container->enabled) {
+ pr_warn("tce_vfio: detaching group #%u from enabled container, forcing disable\n",
+ iommu_group_id(tbl->it_group));
+ tce_iommu_disable(container);
+ }
+
+ /* pr_debug("tce_vfio: detaching group #%u from iommu %p\n",
+ iommu_group_id(iommu_group), iommu_group); */
+ container->tbl = NULL;
+ iommu_release_ownership(tbl);
+ }
+ mutex_unlock(&container->lock);
+}
+
+const struct vfio_iommu_driver_ops tce_iommu_driver_ops = {
+ .name = "iommu-vfio-powerpc",
+ .owner = THIS_MODULE,
+ .open = tce_iommu_open,
+ .release = tce_iommu_release,
+ .ioctl = tce_iommu_ioctl,
+ .attach_group = tce_iommu_attach_group,
+ .detach_group = tce_iommu_detach_group,
+};
+
+static int __init tce_iommu_init(void)
+{
+ return vfio_register_iommu_driver(&tce_iommu_driver_ops);
+}
+
+static void __exit tce_iommu_cleanup(void)
+{
+ vfio_unregister_iommu_driver(&tce_iommu_driver_ops);
+}
+
+module_init(tce_iommu_init);
+module_exit(tce_iommu_cleanup);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
new file mode 100644
index 000000000..57d8c37a0
--- /dev/null
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -0,0 +1,1054 @@
+/*
+ * VFIO: IOMMU DMA mapping support for Type1 IOMMU
+ *
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ *
+ * We arbitrarily define a Type1 IOMMU as one matching the below code.
+ * It could be called the x86 IOMMU as it's designed for AMD-Vi & Intel
+ * VT-d, but that makes it harder to re-use as theoretically anyone
+ * implementing a similar IOMMU could make use of this. We expect the
+ * IOMMU to support the IOMMU API and have few to no restrictions around
+ * the IOVA range that can be mapped. The Type1 IOMMU is currently
+ * optimized for relatively static mappings of a userspace process with
+ * userpsace pages pinned into memory. We also assume devices and IOMMU
+ * domains are PCI based as the IOMMU API is still centered around a
+ * device/bus interface rather than a group interface.
+ */
+
+#include <linux/compat.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/rbtree.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/workqueue.h>
+
+#define DRIVER_VERSION "0.2"
+#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
+#define DRIVER_DESC "Type1 IOMMU driver for VFIO"
+
+static bool allow_unsafe_interrupts;
+module_param_named(allow_unsafe_interrupts,
+ allow_unsafe_interrupts, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(allow_unsafe_interrupts,
+ "Enable VFIO IOMMU support for on platforms without interrupt remapping support.");
+
+static bool disable_hugepages;
+module_param_named(disable_hugepages,
+ disable_hugepages, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(disable_hugepages,
+ "Disable VFIO IOMMU support for IOMMU hugepages.");
+
+struct vfio_iommu {
+ struct list_head domain_list;
+ struct mutex lock;
+ struct rb_root dma_list;
+ bool v2;
+ bool nesting;
+};
+
+struct vfio_domain {
+ struct iommu_domain *domain;
+ struct list_head next;
+ struct list_head group_list;
+ int prot; /* IOMMU_CACHE */
+ bool fgsp; /* Fine-grained super pages */
+};
+
+struct vfio_dma {
+ struct rb_node node;
+ dma_addr_t iova; /* Device address */
+ unsigned long vaddr; /* Process virtual addr */
+ size_t size; /* Map size (bytes) */
+ int prot; /* IOMMU_READ/WRITE */
+};
+
+struct vfio_group {
+ struct iommu_group *iommu_group;
+ struct list_head next;
+};
+
+/*
+ * This code handles mapping and unmapping of user data buffers
+ * into DMA'ble space using the IOMMU
+ */
+
+static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu,
+ dma_addr_t start, size_t size)
+{
+ struct rb_node *node = iommu->dma_list.rb_node;
+
+ while (node) {
+ struct vfio_dma *dma = rb_entry(node, struct vfio_dma, node);
+
+ if (start + size <= dma->iova)
+ node = node->rb_left;
+ else if (start >= dma->iova + dma->size)
+ node = node->rb_right;
+ else
+ return dma;
+ }
+
+ return NULL;
+}
+
+static void vfio_link_dma(struct vfio_iommu *iommu, struct vfio_dma *new)
+{
+ struct rb_node **link = &iommu->dma_list.rb_node, *parent = NULL;
+ struct vfio_dma *dma;
+
+ while (*link) {
+ parent = *link;
+ dma = rb_entry(parent, struct vfio_dma, node);
+
+ if (new->iova + new->size <= dma->iova)
+ link = &(*link)->rb_left;
+ else
+ link = &(*link)->rb_right;
+ }
+
+ rb_link_node(&new->node, parent, link);
+ rb_insert_color(&new->node, &iommu->dma_list);
+}
+
+static void vfio_unlink_dma(struct vfio_iommu *iommu, struct vfio_dma *old)
+{
+ rb_erase(&old->node, &iommu->dma_list);
+}
+
+struct vwork {
+ struct mm_struct *mm;
+ long npage;
+ struct work_struct work;
+};
+
+/* delayed decrement/increment for locked_vm */
+static void vfio_lock_acct_bg(struct work_struct *work)
+{
+ struct vwork *vwork = container_of(work, struct vwork, work);
+ struct mm_struct *mm;
+
+ mm = vwork->mm;
+ down_write(&mm->mmap_sem);
+ mm->locked_vm += vwork->npage;
+ up_write(&mm->mmap_sem);
+ mmput(mm);
+ kfree(vwork);
+}
+
+static void vfio_lock_acct(long npage)
+{
+ struct vwork *vwork;
+ struct mm_struct *mm;
+
+ if (!current->mm || !npage)
+ return; /* process exited or nothing to do */
+
+ if (down_write_trylock(&current->mm->mmap_sem)) {
+ current->mm->locked_vm += npage;
+ up_write(&current->mm->mmap_sem);
+ return;
+ }
+
+ /*
+ * Couldn't get mmap_sem lock, so must setup to update
+ * mm->locked_vm later. If locked_vm were atomic, we
+ * wouldn't need this silliness
+ */
+ vwork = kmalloc(sizeof(struct vwork), GFP_KERNEL);
+ if (!vwork)
+ return;
+ mm = get_task_mm(current);
+ if (!mm) {
+ kfree(vwork);
+ return;
+ }
+ INIT_WORK(&vwork->work, vfio_lock_acct_bg);
+ vwork->mm = mm;
+ vwork->npage = npage;
+ schedule_work(&vwork->work);
+}
+
+/*
+ * Some mappings aren't backed by a struct page, for example an mmap'd
+ * MMIO range for our own or another device. These use a different
+ * pfn conversion and shouldn't be tracked as locked pages.
+ */
+static bool is_invalid_reserved_pfn(unsigned long pfn)
+{
+ if (pfn_valid(pfn)) {
+ bool reserved;
+ struct page *tail = pfn_to_page(pfn);
+ struct page *head = compound_head(tail);
+ reserved = !!(PageReserved(head));
+ if (head != tail) {
+ /*
+ * "head" is not a dangling pointer
+ * (compound_head takes care of that)
+ * but the hugepage may have been split
+ * from under us (and we may not hold a
+ * reference count on the head page so it can
+ * be reused before we run PageReferenced), so
+ * we've to check PageTail before returning
+ * what we just read.
+ */
+ smp_rmb();
+ if (PageTail(tail))
+ return reserved;
+ }
+ return PageReserved(tail);
+ }
+
+ return true;
+}
+
+static int put_pfn(unsigned long pfn, int prot)
+{
+ if (!is_invalid_reserved_pfn(pfn)) {
+ struct page *page = pfn_to_page(pfn);
+ if (prot & IOMMU_WRITE)
+ SetPageDirty(page);
+ put_page(page);
+ return 1;
+ }
+ return 0;
+}
+
+static int vaddr_get_pfn(unsigned long vaddr, int prot, unsigned long *pfn)
+{
+ struct page *page[1];
+ struct vm_area_struct *vma;
+ int ret = -EFAULT;
+
+ if (get_user_pages_fast(vaddr, 1, !!(prot & IOMMU_WRITE), page) == 1) {
+ *pfn = page_to_pfn(page[0]);
+ return 0;
+ }
+
+ down_read(&current->mm->mmap_sem);
+
+ vma = find_vma_intersection(current->mm, vaddr, vaddr + 1);
+
+ if (vma && vma->vm_flags & VM_PFNMAP) {
+ *pfn = ((vaddr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
+ if (is_invalid_reserved_pfn(*pfn))
+ ret = 0;
+ }
+
+ up_read(&current->mm->mmap_sem);
+
+ return ret;
+}
+
+/*
+ * Attempt to pin pages. We really don't want to track all the pfns and
+ * the iommu can only map chunks of consecutive pfns anyway, so get the
+ * first page and all consecutive pages with the same locking.
+ */
+static long vfio_pin_pages(unsigned long vaddr, long npage,
+ int prot, unsigned long *pfn_base)
+{
+ unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+ bool lock_cap = capable(CAP_IPC_LOCK);
+ long ret, i;
+ bool rsvd;
+
+ if (!current->mm)
+ return -ENODEV;
+
+ ret = vaddr_get_pfn(vaddr, prot, pfn_base);
+ if (ret)
+ return ret;
+
+ rsvd = is_invalid_reserved_pfn(*pfn_base);
+
+ if (!rsvd && !lock_cap && current->mm->locked_vm + 1 > limit) {
+ put_pfn(*pfn_base, prot);
+ pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", __func__,
+ limit << PAGE_SHIFT);
+ return -ENOMEM;
+ }
+
+ if (unlikely(disable_hugepages)) {
+ if (!rsvd)
+ vfio_lock_acct(1);
+ return 1;
+ }
+
+ /* Lock all the consecutive pages from pfn_base */
+ for (i = 1, vaddr += PAGE_SIZE; i < npage; i++, vaddr += PAGE_SIZE) {
+ unsigned long pfn = 0;
+
+ ret = vaddr_get_pfn(vaddr, prot, &pfn);
+ if (ret)
+ break;
+
+ if (pfn != *pfn_base + i ||
+ rsvd != is_invalid_reserved_pfn(pfn)) {
+ put_pfn(pfn, prot);
+ break;
+ }
+
+ if (!rsvd && !lock_cap &&
+ current->mm->locked_vm + i + 1 > limit) {
+ put_pfn(pfn, prot);
+ pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n",
+ __func__, limit << PAGE_SHIFT);
+ break;
+ }
+ }
+
+ if (!rsvd)
+ vfio_lock_acct(i);
+
+ return i;
+}
+
+static long vfio_unpin_pages(unsigned long pfn, long npage,
+ int prot, bool do_accounting)
+{
+ unsigned long unlocked = 0;
+ long i;
+
+ for (i = 0; i < npage; i++)
+ unlocked += put_pfn(pfn++, prot);
+
+ if (do_accounting)
+ vfio_lock_acct(-unlocked);
+
+ return unlocked;
+}
+
+static void vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma)
+{
+ dma_addr_t iova = dma->iova, end = dma->iova + dma->size;
+ struct vfio_domain *domain, *d;
+ long unlocked = 0;
+
+ if (!dma->size)
+ return;
+ /*
+ * We use the IOMMU to track the physical addresses, otherwise we'd
+ * need a much more complicated tracking system. Unfortunately that
+ * means we need to use one of the iommu domains to figure out the
+ * pfns to unpin. The rest need to be unmapped in advance so we have
+ * no iommu translations remaining when the pages are unpinned.
+ */
+ domain = d = list_first_entry(&iommu->domain_list,
+ struct vfio_domain, next);
+
+ list_for_each_entry_continue(d, &iommu->domain_list, next) {
+ iommu_unmap(d->domain, dma->iova, dma->size);
+ cond_resched();
+ }
+
+ while (iova < end) {
+ size_t unmapped, len;
+ phys_addr_t phys, next;
+
+ phys = iommu_iova_to_phys(domain->domain, iova);
+ if (WARN_ON(!phys)) {
+ iova += PAGE_SIZE;
+ continue;
+ }
+
+ /*
+ * To optimize for fewer iommu_unmap() calls, each of which
+ * may require hardware cache flushing, try to find the
+ * largest contiguous physical memory chunk to unmap.
+ */
+ for (len = PAGE_SIZE;
+ !domain->fgsp && iova + len < end; len += PAGE_SIZE) {
+ next = iommu_iova_to_phys(domain->domain, iova + len);
+ if (next != phys + len)
+ break;
+ }
+
+ unmapped = iommu_unmap(domain->domain, iova, len);
+ if (WARN_ON(!unmapped))
+ break;
+
+ unlocked += vfio_unpin_pages(phys >> PAGE_SHIFT,
+ unmapped >> PAGE_SHIFT,
+ dma->prot, false);
+ iova += unmapped;
+
+ cond_resched();
+ }
+
+ vfio_lock_acct(-unlocked);
+}
+
+static void vfio_remove_dma(struct vfio_iommu *iommu, struct vfio_dma *dma)
+{
+ vfio_unmap_unpin(iommu, dma);
+ vfio_unlink_dma(iommu, dma);
+ kfree(dma);
+}
+
+static unsigned long vfio_pgsize_bitmap(struct vfio_iommu *iommu)
+{
+ struct vfio_domain *domain;
+ unsigned long bitmap = PAGE_MASK;
+
+ mutex_lock(&iommu->lock);
+ list_for_each_entry(domain, &iommu->domain_list, next)
+ bitmap &= domain->domain->ops->pgsize_bitmap;
+ mutex_unlock(&iommu->lock);
+
+ return bitmap;
+}
+
+static int vfio_dma_do_unmap(struct vfio_iommu *iommu,
+ struct vfio_iommu_type1_dma_unmap *unmap)
+{
+ uint64_t mask;
+ struct vfio_dma *dma;
+ size_t unmapped = 0;
+ int ret = 0;
+
+ mask = ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu))) - 1;
+
+ if (unmap->iova & mask)
+ return -EINVAL;
+ if (!unmap->size || unmap->size & mask)
+ return -EINVAL;
+
+ WARN_ON(mask & PAGE_MASK);
+
+ mutex_lock(&iommu->lock);
+
+ /*
+ * vfio-iommu-type1 (v1) - User mappings were coalesced together to
+ * avoid tracking individual mappings. This means that the granularity
+ * of the original mapping was lost and the user was allowed to attempt
+ * to unmap any range. Depending on the contiguousness of physical
+ * memory and page sizes supported by the IOMMU, arbitrary unmaps may
+ * or may not have worked. We only guaranteed unmap granularity
+ * matching the original mapping; even though it was untracked here,
+ * the original mappings are reflected in IOMMU mappings. This
+ * resulted in a couple unusual behaviors. First, if a range is not
+ * able to be unmapped, ex. a set of 4k pages that was mapped as a
+ * 2M hugepage into the IOMMU, the unmap ioctl returns success but with
+ * a zero sized unmap. Also, if an unmap request overlaps the first
+ * address of a hugepage, the IOMMU will unmap the entire hugepage.
+ * This also returns success and the returned unmap size reflects the
+ * actual size unmapped.
+ *
+ * We attempt to maintain compatibility with this "v1" interface, but
+ * we take control out of the hands of the IOMMU. Therefore, an unmap
+ * request offset from the beginning of the original mapping will
+ * return success with zero sized unmap. And an unmap request covering
+ * the first iova of mapping will unmap the entire range.
+ *
+ * The v2 version of this interface intends to be more deterministic.
+ * Unmap requests must fully cover previous mappings. Multiple
+ * mappings may still be unmaped by specifying large ranges, but there
+ * must not be any previous mappings bisected by the range. An error
+ * will be returned if these conditions are not met. The v2 interface
+ * will only return success and a size of zero if there were no
+ * mappings within the range.
+ */
+ if (iommu->v2) {
+ dma = vfio_find_dma(iommu, unmap->iova, 0);
+ if (dma && dma->iova != unmap->iova) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+ dma = vfio_find_dma(iommu, unmap->iova + unmap->size - 1, 0);
+ if (dma && dma->iova + dma->size != unmap->iova + unmap->size) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+ }
+
+ while ((dma = vfio_find_dma(iommu, unmap->iova, unmap->size))) {
+ if (!iommu->v2 && unmap->iova > dma->iova)
+ break;
+ unmapped += dma->size;
+ vfio_remove_dma(iommu, dma);
+ }
+
+unlock:
+ mutex_unlock(&iommu->lock);
+
+ /* Report how much was unmapped */
+ unmap->size = unmapped;
+
+ return ret;
+}
+
+/*
+ * Turns out AMD IOMMU has a page table bug where it won't map large pages
+ * to a region that previously mapped smaller pages. This should be fixed
+ * soon, so this is just a temporary workaround to break mappings down into
+ * PAGE_SIZE. Better to map smaller pages than nothing.
+ */
+static int map_try_harder(struct vfio_domain *domain, dma_addr_t iova,
+ unsigned long pfn, long npage, int prot)
+{
+ long i;
+ int ret;
+
+ for (i = 0; i < npage; i++, pfn++, iova += PAGE_SIZE) {
+ ret = iommu_map(domain->domain, iova,
+ (phys_addr_t)pfn << PAGE_SHIFT,
+ PAGE_SIZE, prot | domain->prot);
+ if (ret)
+ break;
+ }
+
+ for (; i < npage && i > 0; i--, iova -= PAGE_SIZE)
+ iommu_unmap(domain->domain, iova, PAGE_SIZE);
+
+ return ret;
+}
+
+static int vfio_iommu_map(struct vfio_iommu *iommu, dma_addr_t iova,
+ unsigned long pfn, long npage, int prot)
+{
+ struct vfio_domain *d;
+ int ret;
+
+ list_for_each_entry(d, &iommu->domain_list, next) {
+ ret = iommu_map(d->domain, iova, (phys_addr_t)pfn << PAGE_SHIFT,
+ npage << PAGE_SHIFT, prot | d->prot);
+ if (ret) {
+ if (ret != -EBUSY ||
+ map_try_harder(d, iova, pfn, npage, prot))
+ goto unwind;
+ }
+
+ cond_resched();
+ }
+
+ return 0;
+
+unwind:
+ list_for_each_entry_continue_reverse(d, &iommu->domain_list, next)
+ iommu_unmap(d->domain, iova, npage << PAGE_SHIFT);
+
+ return ret;
+}
+
+static int vfio_dma_do_map(struct vfio_iommu *iommu,
+ struct vfio_iommu_type1_dma_map *map)
+{
+ dma_addr_t iova = map->iova;
+ unsigned long vaddr = map->vaddr;
+ size_t size = map->size;
+ long npage;
+ int ret = 0, prot = 0;
+ uint64_t mask;
+ struct vfio_dma *dma;
+ unsigned long pfn;
+
+ /* Verify that none of our __u64 fields overflow */
+ if (map->size != size || map->vaddr != vaddr || map->iova != iova)
+ return -EINVAL;
+
+ mask = ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu))) - 1;
+
+ WARN_ON(mask & PAGE_MASK);
+
+ /* READ/WRITE from device perspective */
+ if (map->flags & VFIO_DMA_MAP_FLAG_WRITE)
+ prot |= IOMMU_WRITE;
+ if (map->flags & VFIO_DMA_MAP_FLAG_READ)
+ prot |= IOMMU_READ;
+
+ if (!prot || !size || (size | iova | vaddr) & mask)
+ return -EINVAL;
+
+ /* Don't allow IOVA or virtual address wrap */
+ if (iova + size - 1 < iova || vaddr + size - 1 < vaddr)
+ return -EINVAL;
+
+ mutex_lock(&iommu->lock);
+
+ if (vfio_find_dma(iommu, iova, size)) {
+ mutex_unlock(&iommu->lock);
+ return -EEXIST;
+ }
+
+ dma = kzalloc(sizeof(*dma), GFP_KERNEL);
+ if (!dma) {
+ mutex_unlock(&iommu->lock);
+ return -ENOMEM;
+ }
+
+ dma->iova = iova;
+ dma->vaddr = vaddr;
+ dma->prot = prot;
+
+ /* Insert zero-sized and grow as we map chunks of it */
+ vfio_link_dma(iommu, dma);
+
+ while (size) {
+ /* Pin a contiguous chunk of memory */
+ npage = vfio_pin_pages(vaddr + dma->size,
+ size >> PAGE_SHIFT, prot, &pfn);
+ if (npage <= 0) {
+ WARN_ON(!npage);
+ ret = (int)npage;
+ break;
+ }
+
+ /* Map it! */
+ ret = vfio_iommu_map(iommu, iova + dma->size, pfn, npage, prot);
+ if (ret) {
+ vfio_unpin_pages(pfn, npage, prot, true);
+ break;
+ }
+
+ size -= npage << PAGE_SHIFT;
+ dma->size += npage << PAGE_SHIFT;
+ }
+
+ if (ret)
+ vfio_remove_dma(iommu, dma);
+
+ mutex_unlock(&iommu->lock);
+ return ret;
+}
+
+static int vfio_bus_type(struct device *dev, void *data)
+{
+ struct bus_type **bus = data;
+
+ if (*bus && *bus != dev->bus)
+ return -EINVAL;
+
+ *bus = dev->bus;
+
+ return 0;
+}
+
+static int vfio_iommu_replay(struct vfio_iommu *iommu,
+ struct vfio_domain *domain)
+{
+ struct vfio_domain *d;
+ struct rb_node *n;
+ int ret;
+
+ /* Arbitrarily pick the first domain in the list for lookups */
+ d = list_first_entry(&iommu->domain_list, struct vfio_domain, next);
+ n = rb_first(&iommu->dma_list);
+
+ /* If there's not a domain, there better not be any mappings */
+ if (WARN_ON(n && !d))
+ return -EINVAL;
+
+ for (; n; n = rb_next(n)) {
+ struct vfio_dma *dma;
+ dma_addr_t iova;
+
+ dma = rb_entry(n, struct vfio_dma, node);
+ iova = dma->iova;
+
+ while (iova < dma->iova + dma->size) {
+ phys_addr_t phys = iommu_iova_to_phys(d->domain, iova);
+ size_t size;
+
+ if (WARN_ON(!phys)) {
+ iova += PAGE_SIZE;
+ continue;
+ }
+
+ size = PAGE_SIZE;
+
+ while (iova + size < dma->iova + dma->size &&
+ phys + size == iommu_iova_to_phys(d->domain,
+ iova + size))
+ size += PAGE_SIZE;
+
+ ret = iommu_map(domain->domain, iova, phys,
+ size, dma->prot | domain->prot);
+ if (ret)
+ return ret;
+
+ iova += size;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * We change our unmap behavior slightly depending on whether the IOMMU
+ * supports fine-grained superpages. IOMMUs like AMD-Vi will use a superpage
+ * for practically any contiguous power-of-two mapping we give it. This means
+ * we don't need to look for contiguous chunks ourselves to make unmapping
+ * more efficient. On IOMMUs with coarse-grained super pages, like Intel VT-d
+ * with discrete 2M/1G/512G/1T superpages, identifying contiguous chunks
+ * significantly boosts non-hugetlbfs mappings and doesn't seem to hurt when
+ * hugetlbfs is in use.
+ */
+static void vfio_test_domain_fgsp(struct vfio_domain *domain)
+{
+ struct page *pages;
+ int ret, order = get_order(PAGE_SIZE * 2);
+
+ pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
+ if (!pages)
+ return;
+
+ ret = iommu_map(domain->domain, 0, page_to_phys(pages), PAGE_SIZE * 2,
+ IOMMU_READ | IOMMU_WRITE | domain->prot);
+ if (!ret) {
+ size_t unmapped = iommu_unmap(domain->domain, 0, PAGE_SIZE);
+
+ if (unmapped == PAGE_SIZE)
+ iommu_unmap(domain->domain, PAGE_SIZE, PAGE_SIZE);
+ else
+ domain->fgsp = true;
+ }
+
+ __free_pages(pages, order);
+}
+
+static int vfio_iommu_type1_attach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+ struct vfio_iommu *iommu = iommu_data;
+ struct vfio_group *group, *g;
+ struct vfio_domain *domain, *d;
+ struct bus_type *bus = NULL;
+ int ret;
+
+ mutex_lock(&iommu->lock);
+
+ list_for_each_entry(d, &iommu->domain_list, next) {
+ list_for_each_entry(g, &d->group_list, next) {
+ if (g->iommu_group != iommu_group)
+ continue;
+
+ mutex_unlock(&iommu->lock);
+ return -EINVAL;
+ }
+ }
+
+ group = kzalloc(sizeof(*group), GFP_KERNEL);
+ domain = kzalloc(sizeof(*domain), GFP_KERNEL);
+ if (!group || !domain) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ group->iommu_group = iommu_group;
+
+ /* Determine bus_type in order to allocate a domain */
+ ret = iommu_group_for_each_dev(iommu_group, &bus, vfio_bus_type);
+ if (ret)
+ goto out_free;
+
+ domain->domain = iommu_domain_alloc(bus);
+ if (!domain->domain) {
+ ret = -EIO;
+ goto out_free;
+ }
+
+ if (iommu->nesting) {
+ int attr = 1;
+
+ ret = iommu_domain_set_attr(domain->domain, DOMAIN_ATTR_NESTING,
+ &attr);
+ if (ret)
+ goto out_domain;
+ }
+
+ ret = iommu_attach_group(domain->domain, iommu_group);
+ if (ret)
+ goto out_domain;
+
+ INIT_LIST_HEAD(&domain->group_list);
+ list_add(&group->next, &domain->group_list);
+
+ if (!allow_unsafe_interrupts &&
+ !iommu_capable(bus, IOMMU_CAP_INTR_REMAP)) {
+ pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
+ __func__);
+ ret = -EPERM;
+ goto out_detach;
+ }
+
+ if (iommu_capable(bus, IOMMU_CAP_CACHE_COHERENCY))
+ domain->prot |= IOMMU_CACHE;
+
+ /*
+ * Try to match an existing compatible domain. We don't want to
+ * preclude an IOMMU driver supporting multiple bus_types and being
+ * able to include different bus_types in the same IOMMU domain, so
+ * we test whether the domains use the same iommu_ops rather than
+ * testing if they're on the same bus_type.
+ */
+ list_for_each_entry(d, &iommu->domain_list, next) {
+ if (d->domain->ops == domain->domain->ops &&
+ d->prot == domain->prot) {
+ iommu_detach_group(domain->domain, iommu_group);
+ if (!iommu_attach_group(d->domain, iommu_group)) {
+ list_add(&group->next, &d->group_list);
+ iommu_domain_free(domain->domain);
+ kfree(domain);
+ mutex_unlock(&iommu->lock);
+ return 0;
+ }
+
+ ret = iommu_attach_group(domain->domain, iommu_group);
+ if (ret)
+ goto out_domain;
+ }
+ }
+
+ vfio_test_domain_fgsp(domain);
+
+ /* replay mappings on new domains */
+ ret = vfio_iommu_replay(iommu, domain);
+ if (ret)
+ goto out_detach;
+
+ list_add(&domain->next, &iommu->domain_list);
+
+ mutex_unlock(&iommu->lock);
+
+ return 0;
+
+out_detach:
+ iommu_detach_group(domain->domain, iommu_group);
+out_domain:
+ iommu_domain_free(domain->domain);
+out_free:
+ kfree(domain);
+ kfree(group);
+ mutex_unlock(&iommu->lock);
+ return ret;
+}
+
+static void vfio_iommu_unmap_unpin_all(struct vfio_iommu *iommu)
+{
+ struct rb_node *node;
+
+ while ((node = rb_first(&iommu->dma_list)))
+ vfio_remove_dma(iommu, rb_entry(node, struct vfio_dma, node));
+}
+
+static void vfio_iommu_type1_detach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+ struct vfio_iommu *iommu = iommu_data;
+ struct vfio_domain *domain;
+ struct vfio_group *group;
+
+ mutex_lock(&iommu->lock);
+
+ list_for_each_entry(domain, &iommu->domain_list, next) {
+ list_for_each_entry(group, &domain->group_list, next) {
+ if (group->iommu_group != iommu_group)
+ continue;
+
+ iommu_detach_group(domain->domain, iommu_group);
+ list_del(&group->next);
+ kfree(group);
+ /*
+ * Group ownership provides privilege, if the group
+ * list is empty, the domain goes away. If it's the
+ * last domain, then all the mappings go away too.
+ */
+ if (list_empty(&domain->group_list)) {
+ if (list_is_singular(&iommu->domain_list))
+ vfio_iommu_unmap_unpin_all(iommu);
+ iommu_domain_free(domain->domain);
+ list_del(&domain->next);
+ kfree(domain);
+ }
+ goto done;
+ }
+ }
+
+done:
+ mutex_unlock(&iommu->lock);
+}
+
+static void *vfio_iommu_type1_open(unsigned long arg)
+{
+ struct vfio_iommu *iommu;
+
+ iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
+ if (!iommu)
+ return ERR_PTR(-ENOMEM);
+
+ switch (arg) {
+ case VFIO_TYPE1_IOMMU:
+ break;
+ case VFIO_TYPE1_NESTING_IOMMU:
+ iommu->nesting = true;
+ case VFIO_TYPE1v2_IOMMU:
+ iommu->v2 = true;
+ break;
+ default:
+ kfree(iommu);
+ return ERR_PTR(-EINVAL);
+ }
+
+ INIT_LIST_HEAD(&iommu->domain_list);
+ iommu->dma_list = RB_ROOT;
+ mutex_init(&iommu->lock);
+
+ return iommu;
+}
+
+static void vfio_iommu_type1_release(void *iommu_data)
+{
+ struct vfio_iommu *iommu = iommu_data;
+ struct vfio_domain *domain, *domain_tmp;
+ struct vfio_group *group, *group_tmp;
+
+ vfio_iommu_unmap_unpin_all(iommu);
+
+ list_for_each_entry_safe(domain, domain_tmp,
+ &iommu->domain_list, next) {
+ list_for_each_entry_safe(group, group_tmp,
+ &domain->group_list, next) {
+ iommu_detach_group(domain->domain, group->iommu_group);
+ list_del(&group->next);
+ kfree(group);
+ }
+ iommu_domain_free(domain->domain);
+ list_del(&domain->next);
+ kfree(domain);
+ }
+
+ kfree(iommu);
+}
+
+static int vfio_domains_have_iommu_cache(struct vfio_iommu *iommu)
+{
+ struct vfio_domain *domain;
+ int ret = 1;
+
+ mutex_lock(&iommu->lock);
+ list_for_each_entry(domain, &iommu->domain_list, next) {
+ if (!(domain->prot & IOMMU_CACHE)) {
+ ret = 0;
+ break;
+ }
+ }
+ mutex_unlock(&iommu->lock);
+
+ return ret;
+}
+
+static long vfio_iommu_type1_ioctl(void *iommu_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_iommu *iommu = iommu_data;
+ unsigned long minsz;
+
+ if (cmd == VFIO_CHECK_EXTENSION) {
+ switch (arg) {
+ case VFIO_TYPE1_IOMMU:
+ case VFIO_TYPE1v2_IOMMU:
+ case VFIO_TYPE1_NESTING_IOMMU:
+ return 1;
+ case VFIO_DMA_CC_IOMMU:
+ if (!iommu)
+ return 0;
+ return vfio_domains_have_iommu_cache(iommu);
+ default:
+ return 0;
+ }
+ } else if (cmd == VFIO_IOMMU_GET_INFO) {
+ struct vfio_iommu_type1_info info;
+
+ minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ info.flags = 0;
+
+ info.iova_pgsizes = vfio_pgsize_bitmap(iommu);
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+
+ } else if (cmd == VFIO_IOMMU_MAP_DMA) {
+ struct vfio_iommu_type1_dma_map map;
+ uint32_t mask = VFIO_DMA_MAP_FLAG_READ |
+ VFIO_DMA_MAP_FLAG_WRITE;
+
+ minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
+
+ if (copy_from_user(&map, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (map.argsz < minsz || map.flags & ~mask)
+ return -EINVAL;
+
+ return vfio_dma_do_map(iommu, &map);
+
+ } else if (cmd == VFIO_IOMMU_UNMAP_DMA) {
+ struct vfio_iommu_type1_dma_unmap unmap;
+ long ret;
+
+ minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size);
+
+ if (copy_from_user(&unmap, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (unmap.argsz < minsz || unmap.flags)
+ return -EINVAL;
+
+ ret = vfio_dma_do_unmap(iommu, &unmap);
+ if (ret)
+ return ret;
+
+ return copy_to_user((void __user *)arg, &unmap, minsz);
+ }
+
+ return -ENOTTY;
+}
+
+static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
+ .name = "vfio-iommu-type1",
+ .owner = THIS_MODULE,
+ .open = vfio_iommu_type1_open,
+ .release = vfio_iommu_type1_release,
+ .ioctl = vfio_iommu_type1_ioctl,
+ .attach_group = vfio_iommu_type1_attach_group,
+ .detach_group = vfio_iommu_type1_detach_group,
+};
+
+static int __init vfio_iommu_type1_init(void)
+{
+ return vfio_register_iommu_driver(&vfio_iommu_driver_ops_type1);
+}
+
+static void __exit vfio_iommu_type1_cleanup(void)
+{
+ vfio_unregister_iommu_driver(&vfio_iommu_driver_ops_type1);
+}
+
+module_init(vfio_iommu_type1_init);
+module_exit(vfio_iommu_type1_cleanup);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/vfio/vfio_spapr_eeh.c b/drivers/vfio/vfio_spapr_eeh.c
new file mode 100644
index 000000000..5fa42db76
--- /dev/null
+++ b/drivers/vfio/vfio_spapr_eeh.c
@@ -0,0 +1,100 @@
+/*
+ * EEH functionality support for VFIO devices. The feature is only
+ * available on sPAPR compatible platforms.
+ *
+ * Copyright Gavin Shan, IBM Corporation 2014.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <asm/eeh.h>
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "Gavin Shan, IBM Corporation"
+#define DRIVER_DESC "VFIO IOMMU SPAPR EEH"
+
+/* We might build address mapping here for "fast" path later */
+void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
+{
+ eeh_dev_open(pdev);
+}
+EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
+
+void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
+{
+ eeh_dev_release(pdev);
+}
+EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
+
+long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
+ unsigned int cmd, unsigned long arg)
+{
+ struct eeh_pe *pe;
+ struct vfio_eeh_pe_op op;
+ unsigned long minsz;
+ long ret = -EINVAL;
+
+ switch (cmd) {
+ case VFIO_CHECK_EXTENSION:
+ if (arg == VFIO_EEH)
+ ret = eeh_enabled() ? 1 : 0;
+ else
+ ret = 0;
+ break;
+ case VFIO_EEH_PE_OP:
+ pe = eeh_iommu_group_to_pe(group);
+ if (!pe)
+ return -ENODEV;
+
+ minsz = offsetofend(struct vfio_eeh_pe_op, op);
+ if (copy_from_user(&op, (void __user *)arg, minsz))
+ return -EFAULT;
+ if (op.argsz < minsz || op.flags)
+ return -EINVAL;
+
+ switch (op.op) {
+ case VFIO_EEH_PE_DISABLE:
+ ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
+ break;
+ case VFIO_EEH_PE_ENABLE:
+ ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
+ break;
+ case VFIO_EEH_PE_UNFREEZE_IO:
+ ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
+ break;
+ case VFIO_EEH_PE_UNFREEZE_DMA:
+ ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
+ break;
+ case VFIO_EEH_PE_GET_STATE:
+ ret = eeh_pe_get_state(pe);
+ break;
+ case VFIO_EEH_PE_RESET_DEACTIVATE:
+ ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
+ break;
+ case VFIO_EEH_PE_RESET_HOT:
+ ret = eeh_pe_reset(pe, EEH_RESET_HOT);
+ break;
+ case VFIO_EEH_PE_RESET_FUNDAMENTAL:
+ ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
+ break;
+ case VFIO_EEH_PE_CONFIGURE:
+ ret = eeh_pe_configure(pe);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/vfio/virqfd.c b/drivers/vfio/virqfd.c
new file mode 100644
index 000000000..27c89cd5d
--- /dev/null
+++ b/drivers/vfio/virqfd.c
@@ -0,0 +1,226 @@
+/*
+ * VFIO generic eventfd code for IRQFD support.
+ * Derived from drivers/vfio/pci/vfio_pci_intrs.c
+ *
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/vfio.h>
+#include <linux/eventfd.h>
+#include <linux/file.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
+#define DRIVER_DESC "IRQFD support for VFIO bus drivers"
+
+static struct workqueue_struct *vfio_irqfd_cleanup_wq;
+static DEFINE_SPINLOCK(virqfd_lock);
+
+static int __init vfio_virqfd_init(void)
+{
+ vfio_irqfd_cleanup_wq =
+ create_singlethread_workqueue("vfio-irqfd-cleanup");
+ if (!vfio_irqfd_cleanup_wq)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void __exit vfio_virqfd_exit(void)
+{
+ destroy_workqueue(vfio_irqfd_cleanup_wq);
+}
+
+static void virqfd_deactivate(struct virqfd *virqfd)
+{
+ queue_work(vfio_irqfd_cleanup_wq, &virqfd->shutdown);
+}
+
+static int virqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
+{
+ struct virqfd *virqfd = container_of(wait, struct virqfd, wait);
+ unsigned long flags = (unsigned long)key;
+
+ if (flags & POLLIN) {
+ /* An event has been signaled, call function */
+ if ((!virqfd->handler ||
+ virqfd->handler(virqfd->opaque, virqfd->data)) &&
+ virqfd->thread)
+ schedule_work(&virqfd->inject);
+ }
+
+ if (flags & POLLHUP) {
+ unsigned long flags;
+ spin_lock_irqsave(&virqfd_lock, flags);
+
+ /*
+ * The eventfd is closing, if the virqfd has not yet been
+ * queued for release, as determined by testing whether the
+ * virqfd pointer to it is still valid, queue it now. As
+ * with kvm irqfds, we know we won't race against the virqfd
+ * going away because we hold the lock to get here.
+ */
+ if (*(virqfd->pvirqfd) == virqfd) {
+ *(virqfd->pvirqfd) = NULL;
+ virqfd_deactivate(virqfd);
+ }
+
+ spin_unlock_irqrestore(&virqfd_lock, flags);
+ }
+
+ return 0;
+}
+
+static void virqfd_ptable_queue_proc(struct file *file,
+ wait_queue_head_t *wqh, poll_table *pt)
+{
+ struct virqfd *virqfd = container_of(pt, struct virqfd, pt);
+ add_wait_queue(wqh, &virqfd->wait);
+}
+
+static void virqfd_shutdown(struct work_struct *work)
+{
+ struct virqfd *virqfd = container_of(work, struct virqfd, shutdown);
+ u64 cnt;
+
+ eventfd_ctx_remove_wait_queue(virqfd->eventfd, &virqfd->wait, &cnt);
+ flush_work(&virqfd->inject);
+ eventfd_ctx_put(virqfd->eventfd);
+
+ kfree(virqfd);
+}
+
+static void virqfd_inject(struct work_struct *work)
+{
+ struct virqfd *virqfd = container_of(work, struct virqfd, inject);
+ if (virqfd->thread)
+ virqfd->thread(virqfd->opaque, virqfd->data);
+}
+
+int vfio_virqfd_enable(void *opaque,
+ int (*handler)(void *, void *),
+ void (*thread)(void *, void *),
+ void *data, struct virqfd **pvirqfd, int fd)
+{
+ struct fd irqfd;
+ struct eventfd_ctx *ctx;
+ struct virqfd *virqfd;
+ int ret = 0;
+ unsigned int events;
+
+ virqfd = kzalloc(sizeof(*virqfd), GFP_KERNEL);
+ if (!virqfd)
+ return -ENOMEM;
+
+ virqfd->pvirqfd = pvirqfd;
+ virqfd->opaque = opaque;
+ virqfd->handler = handler;
+ virqfd->thread = thread;
+ virqfd->data = data;
+
+ INIT_WORK(&virqfd->shutdown, virqfd_shutdown);
+ INIT_WORK(&virqfd->inject, virqfd_inject);
+
+ irqfd = fdget(fd);
+ if (!irqfd.file) {
+ ret = -EBADF;
+ goto err_fd;
+ }
+
+ ctx = eventfd_ctx_fileget(irqfd.file);
+ if (IS_ERR(ctx)) {
+ ret = PTR_ERR(ctx);
+ goto err_ctx;
+ }
+
+ virqfd->eventfd = ctx;
+
+ /*
+ * virqfds can be released by closing the eventfd or directly
+ * through ioctl. These are both done through a workqueue, so
+ * we update the pointer to the virqfd under lock to avoid
+ * pushing multiple jobs to release the same virqfd.
+ */
+ spin_lock_irq(&virqfd_lock);
+
+ if (*pvirqfd) {
+ spin_unlock_irq(&virqfd_lock);
+ ret = -EBUSY;
+ goto err_busy;
+ }
+ *pvirqfd = virqfd;
+
+ spin_unlock_irq(&virqfd_lock);
+
+ /*
+ * Install our own custom wake-up handling so we are notified via
+ * a callback whenever someone signals the underlying eventfd.
+ */
+ init_waitqueue_func_entry(&virqfd->wait, virqfd_wakeup);
+ init_poll_funcptr(&virqfd->pt, virqfd_ptable_queue_proc);
+
+ events = irqfd.file->f_op->poll(irqfd.file, &virqfd->pt);
+
+ /*
+ * Check if there was an event already pending on the eventfd
+ * before we registered and trigger it as if we didn't miss it.
+ */
+ if (events & POLLIN) {
+ if ((!handler || handler(opaque, data)) && thread)
+ schedule_work(&virqfd->inject);
+ }
+
+ /*
+ * Do not drop the file until the irqfd is fully initialized,
+ * otherwise we might race against the POLLHUP.
+ */
+ fdput(irqfd);
+
+ return 0;
+err_busy:
+ eventfd_ctx_put(ctx);
+err_ctx:
+ fdput(irqfd);
+err_fd:
+ kfree(virqfd);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vfio_virqfd_enable);
+
+void vfio_virqfd_disable(struct virqfd **pvirqfd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&virqfd_lock, flags);
+
+ if (*pvirqfd) {
+ virqfd_deactivate(*pvirqfd);
+ *pvirqfd = NULL;
+ }
+
+ spin_unlock_irqrestore(&virqfd_lock, flags);
+
+ /*
+ * Block until we know all outstanding shutdown jobs have completed.
+ * Even if we don't queue the job, flush the wq to be sure it's
+ * been released.
+ */
+ flush_workqueue(vfio_irqfd_cleanup_wq);
+}
+EXPORT_SYMBOL_GPL(vfio_virqfd_disable);
+
+module_init(vfio_virqfd_init);
+module_exit(vfio_virqfd_exit);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);