diff options
Diffstat (limited to 'drivers/misc/mic/bus')
| -rw-r--r-- | drivers/misc/mic/bus/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/mic/bus/cosm_bus.h | 2 | ||||
| -rw-r--r-- | drivers/misc/mic/bus/vop_bus.c | 203 | ||||
| -rw-r--r-- | drivers/misc/mic/bus/vop_bus.h | 140 |
4 files changed, 346 insertions, 0 deletions
diff --git a/drivers/misc/mic/bus/Makefile b/drivers/misc/mic/bus/Makefile index 761842b0d..8758a7daa 100644 --- a/drivers/misc/mic/bus/Makefile +++ b/drivers/misc/mic/bus/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_INTEL_MIC_BUS) += mic_bus.o obj-$(CONFIG_SCIF_BUS) += scif_bus.o obj-$(CONFIG_MIC_COSM) += cosm_bus.o +obj-$(CONFIG_VOP_BUS) += vop_bus.o diff --git a/drivers/misc/mic/bus/cosm_bus.h b/drivers/misc/mic/bus/cosm_bus.h index f7c57f266..8b6341855 100644 --- a/drivers/misc/mic/bus/cosm_bus.h +++ b/drivers/misc/mic/bus/cosm_bus.h @@ -30,6 +30,7 @@ * @attr_group: Pointer to list of sysfs attribute groups. * @sdev: Device for sysfs entries. * @state: MIC state. + * @prev_state: MIC state previous to MIC_RESETTING * @shutdown_status: MIC status reported by card for shutdown/crashes. * @shutdown_status_int: Internal shutdown status maintained by the driver * @cosm_mutex: Mutex for synchronizing access to data structures. @@ -55,6 +56,7 @@ struct cosm_device { const struct attribute_group **attr_group; struct device *sdev; u8 state; + u8 prev_state; u8 shutdown_status; u8 shutdown_status_int; struct mutex cosm_mutex; diff --git a/drivers/misc/mic/bus/vop_bus.c b/drivers/misc/mic/bus/vop_bus.c new file mode 100644 index 000000000..303da222f --- /dev/null +++ b/drivers/misc/mic/bus/vop_bus.c @@ -0,0 +1,203 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2016 Intel Corporation. + * + * 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. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel Virtio Over PCIe (VOP) Bus driver. + */ +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/idr.h> +#include <linux/dma-mapping.h> + +#include "vop_bus.h" + +static ssize_t device_show(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct vop_device *dev = dev_to_vop(d); + + return sprintf(buf, "0x%04x\n", dev->id.device); +} +static DEVICE_ATTR_RO(device); + +static ssize_t vendor_show(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct vop_device *dev = dev_to_vop(d); + + return sprintf(buf, "0x%04x\n", dev->id.vendor); +} +static DEVICE_ATTR_RO(vendor); + +static ssize_t modalias_show(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct vop_device *dev = dev_to_vop(d); + + return sprintf(buf, "vop:d%08Xv%08X\n", + dev->id.device, dev->id.vendor); +} +static DEVICE_ATTR_RO(modalias); + +static struct attribute *vop_dev_attrs[] = { + &dev_attr_device.attr, + &dev_attr_vendor.attr, + &dev_attr_modalias.attr, + NULL, +}; +ATTRIBUTE_GROUPS(vop_dev); + +static inline int vop_id_match(const struct vop_device *dev, + const struct vop_device_id *id) +{ + if (id->device != dev->id.device && id->device != VOP_DEV_ANY_ID) + return 0; + + return id->vendor == VOP_DEV_ANY_ID || id->vendor == dev->id.vendor; +} + +/* + * This looks through all the IDs a driver claims to support. If any of them + * match, we return 1 and the kernel will call vop_dev_probe(). + */ +static int vop_dev_match(struct device *dv, struct device_driver *dr) +{ + unsigned int i; + struct vop_device *dev = dev_to_vop(dv); + const struct vop_device_id *ids; + + ids = drv_to_vop(dr)->id_table; + for (i = 0; ids[i].device; i++) + if (vop_id_match(dev, &ids[i])) + return 1; + return 0; +} + +static int vop_uevent(struct device *dv, struct kobj_uevent_env *env) +{ + struct vop_device *dev = dev_to_vop(dv); + + return add_uevent_var(env, "MODALIAS=vop:d%08Xv%08X", + dev->id.device, dev->id.vendor); +} + +static int vop_dev_probe(struct device *d) +{ + struct vop_device *dev = dev_to_vop(d); + struct vop_driver *drv = drv_to_vop(dev->dev.driver); + + return drv->probe(dev); +} + +static int vop_dev_remove(struct device *d) +{ + struct vop_device *dev = dev_to_vop(d); + struct vop_driver *drv = drv_to_vop(dev->dev.driver); + + drv->remove(dev); + return 0; +} + +static struct bus_type vop_bus = { + .name = "vop_bus", + .match = vop_dev_match, + .dev_groups = vop_dev_groups, + .uevent = vop_uevent, + .probe = vop_dev_probe, + .remove = vop_dev_remove, +}; + +int vop_register_driver(struct vop_driver *driver) +{ + driver->driver.bus = &vop_bus; + return driver_register(&driver->driver); +} +EXPORT_SYMBOL_GPL(vop_register_driver); + +void vop_unregister_driver(struct vop_driver *driver) +{ + driver_unregister(&driver->driver); +} +EXPORT_SYMBOL_GPL(vop_unregister_driver); + +static void vop_release_dev(struct device *d) +{ + put_device(d); +} + +struct vop_device * +vop_register_device(struct device *pdev, int id, + const struct dma_map_ops *dma_ops, + struct vop_hw_ops *hw_ops, u8 dnode, struct mic_mw *aper, + struct dma_chan *chan) +{ + int ret; + struct vop_device *vdev; + + vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); + if (!vdev) + return ERR_PTR(-ENOMEM); + + vdev->dev.parent = pdev; + vdev->id.device = id; + vdev->id.vendor = VOP_DEV_ANY_ID; + vdev->dev.archdata.dma_ops = (struct dma_map_ops *)dma_ops; + vdev->dev.dma_mask = &vdev->dev.coherent_dma_mask; + dma_set_mask(&vdev->dev, DMA_BIT_MASK(64)); + vdev->dev.release = vop_release_dev; + vdev->hw_ops = hw_ops; + vdev->dev.bus = &vop_bus; + vdev->dnode = dnode; + vdev->aper = aper; + vdev->dma_ch = chan; + vdev->index = dnode - 1; + dev_set_name(&vdev->dev, "vop-dev%u", vdev->index); + /* + * device_register() causes the bus infrastructure to look for a + * matching driver. + */ + ret = device_register(&vdev->dev); + if (ret) + goto free_vdev; + return vdev; +free_vdev: + kfree(vdev); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(vop_register_device); + +void vop_unregister_device(struct vop_device *dev) +{ + device_unregister(&dev->dev); +} +EXPORT_SYMBOL_GPL(vop_unregister_device); + +static int __init vop_init(void) +{ + return bus_register(&vop_bus); +} + +static void __exit vop_exit(void) +{ + bus_unregister(&vop_bus); +} + +core_initcall(vop_init); +module_exit(vop_exit); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Intel(R) VOP Bus driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/misc/mic/bus/vop_bus.h b/drivers/misc/mic/bus/vop_bus.h new file mode 100644 index 000000000..fff7a865d --- /dev/null +++ b/drivers/misc/mic/bus/vop_bus.h @@ -0,0 +1,140 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2016 Intel Corporation. + * + * 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. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel Virtio over PCIe Bus driver. + */ +#ifndef _VOP_BUS_H_ +#define _VOP_BUS_H_ +/* + * Everything a vop driver needs to work with any particular vop + * implementation. + */ +#include <linux/dmaengine.h> +#include <linux/interrupt.h> + +#include "../common/mic_dev.h" + +struct vop_device_id { + u32 device; + u32 vendor; +}; + +#define VOP_DEV_TRNSP 1 +#define VOP_DEV_ANY_ID 0xffffffff +/* + * Size of the internal buffer used during DMA's as an intermediate buffer + * for copy to/from user. Must be an integral number of pages. + */ +#define VOP_INT_DMA_BUF_SIZE PAGE_ALIGN(64 * 1024ULL) + +/** + * vop_device - representation of a device using vop + * @hw_ops: the hardware ops supported by this device. + * @id: the device type identification (used to match it with a driver). + * @dev: underlying device. + * @dnode - The destination node which this device will communicate with. + * @aper: Aperture memory window + * @dma_ch - DMA channel + * @index: unique position on the vop bus + */ +struct vop_device { + struct vop_hw_ops *hw_ops; + struct vop_device_id id; + struct device dev; + u8 dnode; + struct mic_mw *aper; + struct dma_chan *dma_ch; + int index; +}; + +/** + * vop_driver - operations for a vop I/O driver + * @driver: underlying device driver (populate name and owner). + * @id_table: the ids serviced by this driver. + * @probe: the function to call when a device is found. Returns 0 or -errno. + * @remove: the function to call when a device is removed. + */ +struct vop_driver { + struct device_driver driver; + const struct vop_device_id *id_table; + int (*probe)(struct vop_device *dev); + void (*remove)(struct vop_device *dev); +}; + +/** + * vop_hw_ops - Hardware operations for accessing a VOP device on the VOP bus. + * + * @next_db: Obtain the next available doorbell. + * @request_irq: Request an interrupt on a particular doorbell. + * @free_irq: Free an interrupt requested previously. + * @ack_interrupt: acknowledge an interrupt in the ISR. + * @get_remote_dp: Get access to the virtio device page used by the remote + * node to add/remove/configure virtio devices. + * @get_dp: Get access to the virtio device page used by the self + * node to add/remove/configure virtio devices. + * @send_intr: Send an interrupt to the peer node on a specified doorbell. + * @ioremap: Map a buffer with the specified DMA address and length. + * @iounmap: Unmap a buffer previously mapped. + * @dma_filter: The DMA filter function to use for obtaining access to + * a DMA channel on the peer node. + */ +struct vop_hw_ops { + int (*next_db)(struct vop_device *vpdev); + struct mic_irq *(*request_irq)(struct vop_device *vpdev, + irqreturn_t (*func)(int irq, void *data), + const char *name, void *data, + int intr_src); + void (*free_irq)(struct vop_device *vpdev, + struct mic_irq *cookie, void *data); + void (*ack_interrupt)(struct vop_device *vpdev, int num); + void __iomem * (*get_remote_dp)(struct vop_device *vpdev); + void * (*get_dp)(struct vop_device *vpdev); + void (*send_intr)(struct vop_device *vpdev, int db); + void __iomem * (*ioremap)(struct vop_device *vpdev, + dma_addr_t pa, size_t len); + void (*iounmap)(struct vop_device *vpdev, void __iomem *va); +}; + +struct vop_device * +vop_register_device(struct device *pdev, int id, + const struct dma_map_ops *dma_ops, + struct vop_hw_ops *hw_ops, u8 dnode, struct mic_mw *aper, + struct dma_chan *chan); +void vop_unregister_device(struct vop_device *dev); +int vop_register_driver(struct vop_driver *drv); +void vop_unregister_driver(struct vop_driver *drv); + +/* + * module_vop_driver() - Helper macro for drivers that don't do + * anything special in module init/exit. This eliminates a lot of + * boilerplate. Each module may only use this macro once, and + * calling it replaces module_init() and module_exit() + */ +#define module_vop_driver(__vop_driver) \ + module_driver(__vop_driver, vop_register_driver, \ + vop_unregister_driver) + +static inline struct vop_device *dev_to_vop(struct device *dev) +{ + return container_of(dev, struct vop_device, dev); +} + +static inline struct vop_driver *drv_to_vop(struct device_driver *drv) +{ + return container_of(drv, struct vop_driver, driver); +} +#endif /* _VOP_BUS_H */ |