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path: root/drivers/scsi/storvsc_drv.c
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Diffstat (limited to 'drivers/scsi/storvsc_drv.c')
-rw-r--r--drivers/scsi/storvsc_drv.c1935
1 files changed, 1935 insertions, 0 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
new file mode 100644
index 000000000..3c6584ff6
--- /dev/null
+++ b/drivers/scsi/storvsc_drv.c
@@ -0,0 +1,1935 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ * K. Y. Srinivasan <kys@microsoft.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/hyperv.h>
+#include <linux/blkdev.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_devinfo.h>
+#include <scsi/scsi_dbg.h>
+
+/*
+ * All wire protocol details (storage protocol between the guest and the host)
+ * are consolidated here.
+ *
+ * Begin protocol definitions.
+ */
+
+/*
+ * Version history:
+ * V1 Beta: 0.1
+ * V1 RC < 2008/1/31: 1.0
+ * V1 RC > 2008/1/31: 2.0
+ * Win7: 4.2
+ * Win8: 5.1
+ */
+
+
+#define VMSTOR_WIN7_MAJOR 4
+#define VMSTOR_WIN7_MINOR 2
+
+#define VMSTOR_WIN8_MAJOR 5
+#define VMSTOR_WIN8_MINOR 1
+
+
+/* Packet structure describing virtual storage requests. */
+enum vstor_packet_operation {
+ VSTOR_OPERATION_COMPLETE_IO = 1,
+ VSTOR_OPERATION_REMOVE_DEVICE = 2,
+ VSTOR_OPERATION_EXECUTE_SRB = 3,
+ VSTOR_OPERATION_RESET_LUN = 4,
+ VSTOR_OPERATION_RESET_ADAPTER = 5,
+ VSTOR_OPERATION_RESET_BUS = 6,
+ VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
+ VSTOR_OPERATION_END_INITIALIZATION = 8,
+ VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
+ VSTOR_OPERATION_QUERY_PROPERTIES = 10,
+ VSTOR_OPERATION_ENUMERATE_BUS = 11,
+ VSTOR_OPERATION_FCHBA_DATA = 12,
+ VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13,
+ VSTOR_OPERATION_MAXIMUM = 13
+};
+
+/*
+ * WWN packet for Fibre Channel HBA
+ */
+
+struct hv_fc_wwn_packet {
+ bool primary_active;
+ u8 reserved1;
+ u8 reserved2;
+ u8 primary_port_wwn[8];
+ u8 primary_node_wwn[8];
+ u8 secondary_port_wwn[8];
+ u8 secondary_node_wwn[8];
+};
+
+
+
+/*
+ * SRB Flag Bits
+ */
+
+#define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002
+#define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004
+#define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008
+#define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010
+#define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020
+#define SRB_FLAGS_DATA_IN 0x00000040
+#define SRB_FLAGS_DATA_OUT 0x00000080
+#define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000
+#define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)
+#define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100
+#define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200
+#define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400
+
+/*
+ * This flag indicates the request is part of the workflow for processing a D3.
+ */
+#define SRB_FLAGS_D3_PROCESSING 0x00000800
+#define SRB_FLAGS_IS_ACTIVE 0x00010000
+#define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000
+#define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000
+#define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000
+#define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000
+#define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000
+#define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000
+#define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000
+#define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000
+#define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000
+
+
+/*
+ * Platform neutral description of a scsi request -
+ * this remains the same across the write regardless of 32/64 bit
+ * note: it's patterned off the SCSI_PASS_THROUGH structure
+ */
+#define STORVSC_MAX_CMD_LEN 0x10
+
+#define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
+#define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
+
+#define STORVSC_SENSE_BUFFER_SIZE 0x14
+#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
+
+/*
+ * Sense buffer size changed in win8; have a run-time
+ * variable to track the size we should use.
+ */
+static int sense_buffer_size;
+
+/*
+ * The size of the vmscsi_request has changed in win8. The
+ * additional size is because of new elements added to the
+ * structure. These elements are valid only when we are talking
+ * to a win8 host.
+ * Track the correction to size we need to apply.
+ */
+
+static int vmscsi_size_delta;
+static int vmstor_current_major;
+static int vmstor_current_minor;
+
+struct vmscsi_win8_extension {
+ /*
+ * The following were added in Windows 8
+ */
+ u16 reserve;
+ u8 queue_tag;
+ u8 queue_action;
+ u32 srb_flags;
+ u32 time_out_value;
+ u32 queue_sort_ey;
+} __packed;
+
+struct vmscsi_request {
+ u16 length;
+ u8 srb_status;
+ u8 scsi_status;
+
+ u8 port_number;
+ u8 path_id;
+ u8 target_id;
+ u8 lun;
+
+ u8 cdb_length;
+ u8 sense_info_length;
+ u8 data_in;
+ u8 reserved;
+
+ u32 data_transfer_length;
+
+ union {
+ u8 cdb[STORVSC_MAX_CMD_LEN];
+ u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
+ u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
+ };
+ /*
+ * The following was added in win8.
+ */
+ struct vmscsi_win8_extension win8_extension;
+
+} __attribute((packed));
+
+
+/*
+ * This structure is sent during the intialization phase to get the different
+ * properties of the channel.
+ */
+
+#define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
+
+struct vmstorage_channel_properties {
+ u32 reserved;
+ u16 max_channel_cnt;
+ u16 reserved1;
+
+ u32 flags;
+ u32 max_transfer_bytes;
+
+ u64 reserved2;
+} __packed;
+
+/* This structure is sent during the storage protocol negotiations. */
+struct vmstorage_protocol_version {
+ /* Major (MSW) and minor (LSW) version numbers. */
+ u16 major_minor;
+
+ /*
+ * Revision number is auto-incremented whenever this file is changed
+ * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
+ * definitely indicate incompatibility--but it does indicate mismatched
+ * builds.
+ * This is only used on the windows side. Just set it to 0.
+ */
+ u16 revision;
+} __packed;
+
+/* Channel Property Flags */
+#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
+#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
+
+struct vstor_packet {
+ /* Requested operation type */
+ enum vstor_packet_operation operation;
+
+ /* Flags - see below for values */
+ u32 flags;
+
+ /* Status of the request returned from the server side. */
+ u32 status;
+
+ /* Data payload area */
+ union {
+ /*
+ * Structure used to forward SCSI commands from the
+ * client to the server.
+ */
+ struct vmscsi_request vm_srb;
+
+ /* Structure used to query channel properties. */
+ struct vmstorage_channel_properties storage_channel_properties;
+
+ /* Used during version negotiations. */
+ struct vmstorage_protocol_version version;
+
+ /* Fibre channel address packet */
+ struct hv_fc_wwn_packet wwn_packet;
+
+ /* Number of sub-channels to create */
+ u16 sub_channel_count;
+
+ /* This will be the maximum of the union members */
+ u8 buffer[0x34];
+ };
+} __packed;
+
+/*
+ * Packet Flags:
+ *
+ * This flag indicates that the server should send back a completion for this
+ * packet.
+ */
+
+#define REQUEST_COMPLETION_FLAG 0x1
+
+/* Matches Windows-end */
+enum storvsc_request_type {
+ WRITE_TYPE = 0,
+ READ_TYPE,
+ UNKNOWN_TYPE,
+};
+
+/*
+ * SRB status codes and masks; a subset of the codes used here.
+ */
+
+#define SRB_STATUS_AUTOSENSE_VALID 0x80
+#define SRB_STATUS_INVALID_LUN 0x20
+#define SRB_STATUS_SUCCESS 0x01
+#define SRB_STATUS_ABORTED 0x02
+#define SRB_STATUS_ERROR 0x04
+
+/*
+ * This is the end of Protocol specific defines.
+ */
+
+static int storvsc_ringbuffer_size = (256 * PAGE_SIZE);
+static u32 max_outstanding_req_per_channel;
+
+static int storvsc_vcpus_per_sub_channel = 4;
+
+module_param(storvsc_ringbuffer_size, int, S_IRUGO);
+MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
+
+module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO);
+MODULE_PARM_DESC(vcpus_per_sub_channel, "Ratio of VCPUs to subchannels");
+/*
+ * Timeout in seconds for all devices managed by this driver.
+ */
+static int storvsc_timeout = 180;
+
+static int msft_blist_flags = BLIST_TRY_VPD_PAGES;
+
+
+static void storvsc_on_channel_callback(void *context);
+
+#define STORVSC_MAX_LUNS_PER_TARGET 255
+#define STORVSC_MAX_TARGETS 2
+#define STORVSC_MAX_CHANNELS 8
+
+#define STORVSC_FC_MAX_LUNS_PER_TARGET 255
+#define STORVSC_FC_MAX_TARGETS 128
+#define STORVSC_FC_MAX_CHANNELS 8
+
+#define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
+#define STORVSC_IDE_MAX_TARGETS 1
+#define STORVSC_IDE_MAX_CHANNELS 1
+
+struct storvsc_cmd_request {
+ struct scsi_cmnd *cmd;
+
+ unsigned int bounce_sgl_count;
+ struct scatterlist *bounce_sgl;
+
+ struct hv_device *device;
+
+ /* Synchronize the request/response if needed */
+ struct completion wait_event;
+
+ struct vmbus_channel_packet_multipage_buffer mpb;
+ struct vmbus_packet_mpb_array *payload;
+ u32 payload_sz;
+
+ struct vstor_packet vstor_packet;
+};
+
+
+/* A storvsc device is a device object that contains a vmbus channel */
+struct storvsc_device {
+ struct hv_device *device;
+
+ bool destroy;
+ bool drain_notify;
+ bool open_sub_channel;
+ atomic_t num_outstanding_req;
+ struct Scsi_Host *host;
+
+ wait_queue_head_t waiting_to_drain;
+
+ /*
+ * Each unique Port/Path/Target represents 1 channel ie scsi
+ * controller. In reality, the pathid, targetid is always 0
+ * and the port is set by us
+ */
+ unsigned int port_number;
+ unsigned char path_id;
+ unsigned char target_id;
+
+ /*
+ * Max I/O, the device can support.
+ */
+ u32 max_transfer_bytes;
+ /* Used for vsc/vsp channel reset process */
+ struct storvsc_cmd_request init_request;
+ struct storvsc_cmd_request reset_request;
+};
+
+struct hv_host_device {
+ struct hv_device *dev;
+ unsigned int port;
+ unsigned char path;
+ unsigned char target;
+};
+
+struct storvsc_scan_work {
+ struct work_struct work;
+ struct Scsi_Host *host;
+ uint lun;
+};
+
+static void storvsc_device_scan(struct work_struct *work)
+{
+ struct storvsc_scan_work *wrk;
+ uint lun;
+ struct scsi_device *sdev;
+
+ wrk = container_of(work, struct storvsc_scan_work, work);
+ lun = wrk->lun;
+
+ sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
+ if (!sdev)
+ goto done;
+ scsi_rescan_device(&sdev->sdev_gendev);
+ scsi_device_put(sdev);
+
+done:
+ kfree(wrk);
+}
+
+static void storvsc_host_scan(struct work_struct *work)
+{
+ struct storvsc_scan_work *wrk;
+ struct Scsi_Host *host;
+ struct scsi_device *sdev;
+ unsigned long flags;
+
+ wrk = container_of(work, struct storvsc_scan_work, work);
+ host = wrk->host;
+
+ /*
+ * Before scanning the host, first check to see if any of the
+ * currrently known devices have been hot removed. We issue a
+ * "unit ready" command against all currently known devices.
+ * This I/O will result in an error for devices that have been
+ * removed. As part of handling the I/O error, we remove the device.
+ *
+ * When a LUN is added or removed, the host sends us a signal to
+ * scan the host. Thus we are forced to discover the LUNs that
+ * may have been removed this way.
+ */
+ mutex_lock(&host->scan_mutex);
+ spin_lock_irqsave(host->host_lock, flags);
+ list_for_each_entry(sdev, &host->__devices, siblings) {
+ spin_unlock_irqrestore(host->host_lock, flags);
+ scsi_test_unit_ready(sdev, 1, 1, NULL);
+ spin_lock_irqsave(host->host_lock, flags);
+ continue;
+ }
+ spin_unlock_irqrestore(host->host_lock, flags);
+ mutex_unlock(&host->scan_mutex);
+ /*
+ * Now scan the host to discover LUNs that may have been added.
+ */
+ scsi_scan_host(host);
+
+ kfree(wrk);
+}
+
+static void storvsc_remove_lun(struct work_struct *work)
+{
+ struct storvsc_scan_work *wrk;
+ struct scsi_device *sdev;
+
+ wrk = container_of(work, struct storvsc_scan_work, work);
+ if (!scsi_host_get(wrk->host))
+ goto done;
+
+ sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
+
+ if (sdev) {
+ scsi_remove_device(sdev);
+ scsi_device_put(sdev);
+ }
+ scsi_host_put(wrk->host);
+
+done:
+ kfree(wrk);
+}
+
+/*
+ * Major/minor macros. Minor version is in LSB, meaning that earlier flat
+ * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
+ */
+
+static inline u16 storvsc_get_version(u8 major, u8 minor)
+{
+ u16 version;
+
+ version = ((major << 8) | minor);
+ return version;
+}
+
+/*
+ * We can get incoming messages from the host that are not in response to
+ * messages that we have sent out. An example of this would be messages
+ * received by the guest to notify dynamic addition/removal of LUNs. To
+ * deal with potential race conditions where the driver may be in the
+ * midst of being unloaded when we might receive an unsolicited message
+ * from the host, we have implemented a mechanism to gurantee sequential
+ * consistency:
+ *
+ * 1) Once the device is marked as being destroyed, we will fail all
+ * outgoing messages.
+ * 2) We permit incoming messages when the device is being destroyed,
+ * only to properly account for messages already sent out.
+ */
+
+static inline struct storvsc_device *get_out_stor_device(
+ struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+
+ stor_device = hv_get_drvdata(device);
+
+ if (stor_device && stor_device->destroy)
+ stor_device = NULL;
+
+ return stor_device;
+}
+
+
+static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
+{
+ dev->drain_notify = true;
+ wait_event(dev->waiting_to_drain,
+ atomic_read(&dev->num_outstanding_req) == 0);
+ dev->drain_notify = false;
+}
+
+static inline struct storvsc_device *get_in_stor_device(
+ struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+
+ stor_device = hv_get_drvdata(device);
+
+ if (!stor_device)
+ goto get_in_err;
+
+ /*
+ * If the device is being destroyed; allow incoming
+ * traffic only to cleanup outstanding requests.
+ */
+
+ if (stor_device->destroy &&
+ (atomic_read(&stor_device->num_outstanding_req) == 0))
+ stor_device = NULL;
+
+get_in_err:
+ return stor_device;
+
+}
+
+static void destroy_bounce_buffer(struct scatterlist *sgl,
+ unsigned int sg_count)
+{
+ int i;
+ struct page *page_buf;
+
+ for (i = 0; i < sg_count; i++) {
+ page_buf = sg_page((&sgl[i]));
+ if (page_buf != NULL)
+ __free_page(page_buf);
+ }
+
+ kfree(sgl);
+}
+
+static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
+{
+ int i;
+
+ /* No need to check */
+ if (sg_count < 2)
+ return -1;
+
+ /* We have at least 2 sg entries */
+ for (i = 0; i < sg_count; i++) {
+ if (i == 0) {
+ /* make sure 1st one does not have hole */
+ if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
+ return i;
+ } else if (i == sg_count - 1) {
+ /* make sure last one does not have hole */
+ if (sgl[i].offset != 0)
+ return i;
+ } else {
+ /* make sure no hole in the middle */
+ if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
+ return i;
+ }
+ }
+ return -1;
+}
+
+static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
+ unsigned int sg_count,
+ unsigned int len,
+ int write)
+{
+ int i;
+ int num_pages;
+ struct scatterlist *bounce_sgl;
+ struct page *page_buf;
+ unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
+
+ num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
+
+ bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
+ if (!bounce_sgl)
+ return NULL;
+
+ sg_init_table(bounce_sgl, num_pages);
+ for (i = 0; i < num_pages; i++) {
+ page_buf = alloc_page(GFP_ATOMIC);
+ if (!page_buf)
+ goto cleanup;
+ sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
+ }
+
+ return bounce_sgl;
+
+cleanup:
+ destroy_bounce_buffer(bounce_sgl, num_pages);
+ return NULL;
+}
+
+/* Assume the original sgl has enough room */
+static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
+ struct scatterlist *bounce_sgl,
+ unsigned int orig_sgl_count,
+ unsigned int bounce_sgl_count)
+{
+ int i;
+ int j = 0;
+ unsigned long src, dest;
+ unsigned int srclen, destlen, copylen;
+ unsigned int total_copied = 0;
+ unsigned long bounce_addr = 0;
+ unsigned long dest_addr = 0;
+ unsigned long flags;
+ struct scatterlist *cur_dest_sgl;
+ struct scatterlist *cur_src_sgl;
+
+ local_irq_save(flags);
+ cur_dest_sgl = orig_sgl;
+ cur_src_sgl = bounce_sgl;
+ for (i = 0; i < orig_sgl_count; i++) {
+ dest_addr = (unsigned long)
+ kmap_atomic(sg_page(cur_dest_sgl)) +
+ cur_dest_sgl->offset;
+ dest = dest_addr;
+ destlen = cur_dest_sgl->length;
+
+ if (bounce_addr == 0)
+ bounce_addr = (unsigned long)kmap_atomic(
+ sg_page(cur_src_sgl));
+
+ while (destlen) {
+ src = bounce_addr + cur_src_sgl->offset;
+ srclen = cur_src_sgl->length - cur_src_sgl->offset;
+
+ copylen = min(srclen, destlen);
+ memcpy((void *)dest, (void *)src, copylen);
+
+ total_copied += copylen;
+ cur_src_sgl->offset += copylen;
+ destlen -= copylen;
+ dest += copylen;
+
+ if (cur_src_sgl->offset == cur_src_sgl->length) {
+ /* full */
+ kunmap_atomic((void *)bounce_addr);
+ j++;
+
+ /*
+ * It is possible that the number of elements
+ * in the bounce buffer may not be equal to
+ * the number of elements in the original
+ * scatter list. Handle this correctly.
+ */
+
+ if (j == bounce_sgl_count) {
+ /*
+ * We are done; cleanup and return.
+ */
+ kunmap_atomic((void *)(dest_addr -
+ cur_dest_sgl->offset));
+ local_irq_restore(flags);
+ return total_copied;
+ }
+
+ /* if we need to use another bounce buffer */
+ if (destlen || i != orig_sgl_count - 1) {
+ cur_src_sgl = sg_next(cur_src_sgl);
+ bounce_addr = (unsigned long)
+ kmap_atomic(
+ sg_page(cur_src_sgl));
+ }
+ } else if (destlen == 0 && i == orig_sgl_count - 1) {
+ /* unmap the last bounce that is < PAGE_SIZE */
+ kunmap_atomic((void *)bounce_addr);
+ }
+ }
+
+ kunmap_atomic((void *)(dest_addr - cur_dest_sgl->offset));
+ cur_dest_sgl = sg_next(cur_dest_sgl);
+ }
+
+ local_irq_restore(flags);
+
+ return total_copied;
+}
+
+/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
+static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
+ struct scatterlist *bounce_sgl,
+ unsigned int orig_sgl_count)
+{
+ int i;
+ int j = 0;
+ unsigned long src, dest;
+ unsigned int srclen, destlen, copylen;
+ unsigned int total_copied = 0;
+ unsigned long bounce_addr = 0;
+ unsigned long src_addr = 0;
+ unsigned long flags;
+ struct scatterlist *cur_src_sgl;
+ struct scatterlist *cur_dest_sgl;
+
+ local_irq_save(flags);
+
+ cur_src_sgl = orig_sgl;
+ cur_dest_sgl = bounce_sgl;
+
+ for (i = 0; i < orig_sgl_count; i++) {
+ src_addr = (unsigned long)
+ kmap_atomic(sg_page(cur_src_sgl)) +
+ cur_src_sgl->offset;
+ src = src_addr;
+ srclen = cur_src_sgl->length;
+
+ if (bounce_addr == 0)
+ bounce_addr = (unsigned long)
+ kmap_atomic(sg_page(cur_dest_sgl));
+
+ while (srclen) {
+ /* assume bounce offset always == 0 */
+ dest = bounce_addr + cur_dest_sgl->length;
+ destlen = PAGE_SIZE - cur_dest_sgl->length;
+
+ copylen = min(srclen, destlen);
+ memcpy((void *)dest, (void *)src, copylen);
+
+ total_copied += copylen;
+ cur_dest_sgl->length += copylen;
+ srclen -= copylen;
+ src += copylen;
+
+ if (cur_dest_sgl->length == PAGE_SIZE) {
+ /* full..move to next entry */
+ kunmap_atomic((void *)bounce_addr);
+ bounce_addr = 0;
+ j++;
+ }
+
+ /* if we need to use another bounce buffer */
+ if (srclen && bounce_addr == 0) {
+ cur_dest_sgl = sg_next(cur_dest_sgl);
+ bounce_addr = (unsigned long)
+ kmap_atomic(
+ sg_page(cur_dest_sgl));
+ }
+
+ }
+
+ kunmap_atomic((void *)(src_addr - cur_src_sgl->offset));
+ cur_src_sgl = sg_next(cur_src_sgl);
+ }
+
+ if (bounce_addr)
+ kunmap_atomic((void *)bounce_addr);
+
+ local_irq_restore(flags);
+
+ return total_copied;
+}
+
+static void handle_sc_creation(struct vmbus_channel *new_sc)
+{
+ struct hv_device *device = new_sc->primary_channel->device_obj;
+ struct storvsc_device *stor_device;
+ struct vmstorage_channel_properties props;
+
+ stor_device = get_out_stor_device(device);
+ if (!stor_device)
+ return;
+
+ if (stor_device->open_sub_channel == false)
+ return;
+
+ memset(&props, 0, sizeof(struct vmstorage_channel_properties));
+
+ vmbus_open(new_sc,
+ storvsc_ringbuffer_size,
+ storvsc_ringbuffer_size,
+ (void *)&props,
+ sizeof(struct vmstorage_channel_properties),
+ storvsc_on_channel_callback, new_sc);
+}
+
+static void handle_multichannel_storage(struct hv_device *device, int max_chns)
+{
+ struct storvsc_device *stor_device;
+ int num_cpus = num_online_cpus();
+ int num_sc;
+ struct storvsc_cmd_request *request;
+ struct vstor_packet *vstor_packet;
+ int ret, t;
+
+ num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns);
+ stor_device = get_out_stor_device(device);
+ if (!stor_device)
+ return;
+
+ request = &stor_device->init_request;
+ vstor_packet = &request->vstor_packet;
+
+ stor_device->open_sub_channel = true;
+ /*
+ * Establish a handler for dealing with subchannels.
+ */
+ vmbus_set_sc_create_callback(device->channel, handle_sc_creation);
+
+ /*
+ * Check to see if sub-channels have already been created. This
+ * can happen when this driver is re-loaded after unloading.
+ */
+
+ if (vmbus_are_subchannels_present(device->channel))
+ return;
+
+ stor_device->open_sub_channel = false;
+ /*
+ * Request the host to create sub-channels.
+ */
+ memset(request, 0, sizeof(struct storvsc_cmd_request));
+ init_completion(&request->wait_event);
+ vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+ vstor_packet->sub_channel_count = num_sc;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+ if (ret != 0)
+ return;
+
+ t = wait_for_completion_timeout(&request->wait_event, 10*HZ);
+ if (t == 0)
+ return;
+
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
+ vstor_packet->status != 0)
+ return;
+
+ /*
+ * Now that we created the sub-channels, invoke the check; this
+ * may trigger the callback.
+ */
+ stor_device->open_sub_channel = true;
+ vmbus_are_subchannels_present(device->channel);
+}
+
+static int storvsc_channel_init(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+ struct storvsc_cmd_request *request;
+ struct vstor_packet *vstor_packet;
+ int ret, t;
+ int max_chns;
+ bool process_sub_channels = false;
+
+ stor_device = get_out_stor_device(device);
+ if (!stor_device)
+ return -ENODEV;
+
+ request = &stor_device->init_request;
+ vstor_packet = &request->vstor_packet;
+
+ /*
+ * Now, initiate the vsc/vsp initialization protocol on the open
+ * channel
+ */
+ memset(request, 0, sizeof(struct storvsc_cmd_request));
+ init_completion(&request->wait_event);
+ vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ if (ret != 0)
+ goto cleanup;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
+ vstor_packet->status != 0)
+ goto cleanup;
+
+
+ /* reuse the packet for version range supported */
+ memset(vstor_packet, 0, sizeof(struct vstor_packet));
+ vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+
+ vstor_packet->version.major_minor =
+ storvsc_get_version(vmstor_current_major, vmstor_current_minor);
+
+ /*
+ * The revision number is only used in Windows; set it to 0.
+ */
+ vstor_packet->version.revision = 0;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ if (ret != 0)
+ goto cleanup;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
+ vstor_packet->status != 0)
+ goto cleanup;
+
+
+ memset(vstor_packet, 0, sizeof(struct vstor_packet));
+ vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+ if (ret != 0)
+ goto cleanup;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
+ vstor_packet->status != 0)
+ goto cleanup;
+
+ /*
+ * Check to see if multi-channel support is there.
+ * Hosts that implement protocol version of 5.1 and above
+ * support multi-channel.
+ */
+ max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
+ if ((vmbus_proto_version != VERSION_WIN7) &&
+ (vmbus_proto_version != VERSION_WS2008)) {
+ if (vstor_packet->storage_channel_properties.flags &
+ STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
+ process_sub_channels = true;
+ }
+ stor_device->max_transfer_bytes =
+ vstor_packet->storage_channel_properties.max_transfer_bytes;
+
+ memset(vstor_packet, 0, sizeof(struct vstor_packet));
+ vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+ if (ret != 0)
+ goto cleanup;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
+ vstor_packet->status != 0)
+ goto cleanup;
+
+ if (process_sub_channels)
+ handle_multichannel_storage(device, max_chns);
+
+
+cleanup:
+ return ret;
+}
+
+static void storvsc_handle_error(struct vmscsi_request *vm_srb,
+ struct scsi_cmnd *scmnd,
+ struct Scsi_Host *host,
+ u8 asc, u8 ascq)
+{
+ struct storvsc_scan_work *wrk;
+ void (*process_err_fn)(struct work_struct *work);
+ bool do_work = false;
+
+ switch (vm_srb->srb_status) {
+ case SRB_STATUS_ERROR:
+ /*
+ * If there is an error; offline the device since all
+ * error recovery strategies would have already been
+ * deployed on the host side. However, if the command
+ * were a pass-through command deal with it appropriately.
+ */
+ switch (scmnd->cmnd[0]) {
+ case ATA_16:
+ case ATA_12:
+ set_host_byte(scmnd, DID_PASSTHROUGH);
+ break;
+ /*
+ * On Some Windows hosts TEST_UNIT_READY command can return
+ * SRB_STATUS_ERROR, let the upper level code deal with it
+ * based on the sense information.
+ */
+ case TEST_UNIT_READY:
+ break;
+ default:
+ set_host_byte(scmnd, DID_TARGET_FAILURE);
+ }
+ break;
+ case SRB_STATUS_INVALID_LUN:
+ do_work = true;
+ process_err_fn = storvsc_remove_lun;
+ break;
+ case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
+ if ((asc == 0x2a) && (ascq == 0x9)) {
+ do_work = true;
+ process_err_fn = storvsc_device_scan;
+ /*
+ * Retry the I/O that trigerred this.
+ */
+ set_host_byte(scmnd, DID_REQUEUE);
+ }
+ break;
+ }
+
+ if (!do_work)
+ return;
+
+ /*
+ * We need to schedule work to process this error; schedule it.
+ */
+ wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
+ if (!wrk) {
+ set_host_byte(scmnd, DID_TARGET_FAILURE);
+ return;
+ }
+
+ wrk->host = host;
+ wrk->lun = vm_srb->lun;
+ INIT_WORK(&wrk->work, process_err_fn);
+ schedule_work(&wrk->work);
+}
+
+
+static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
+{
+ struct scsi_cmnd *scmnd = cmd_request->cmd;
+ struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
+ struct scsi_sense_hdr sense_hdr;
+ struct vmscsi_request *vm_srb;
+ struct Scsi_Host *host;
+ struct storvsc_device *stor_dev;
+ struct hv_device *dev = host_dev->dev;
+ u32 payload_sz = cmd_request->payload_sz;
+ void *payload = cmd_request->payload;
+
+ stor_dev = get_in_stor_device(dev);
+ host = stor_dev->host;
+
+ vm_srb = &cmd_request->vstor_packet.vm_srb;
+ if (cmd_request->bounce_sgl_count) {
+ if (vm_srb->data_in == READ_TYPE)
+ copy_from_bounce_buffer(scsi_sglist(scmnd),
+ cmd_request->bounce_sgl,
+ scsi_sg_count(scmnd),
+ cmd_request->bounce_sgl_count);
+ destroy_bounce_buffer(cmd_request->bounce_sgl,
+ cmd_request->bounce_sgl_count);
+ }
+
+ scmnd->result = vm_srb->scsi_status;
+
+ if (scmnd->result) {
+ if (scsi_normalize_sense(scmnd->sense_buffer,
+ SCSI_SENSE_BUFFERSIZE, &sense_hdr))
+ scsi_print_sense_hdr(scmnd->device, "storvsc",
+ &sense_hdr);
+ }
+
+ if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
+ storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
+ sense_hdr.ascq);
+
+ scsi_set_resid(scmnd,
+ cmd_request->payload->range.len -
+ vm_srb->data_transfer_length);
+
+ scmnd->scsi_done(scmnd);
+
+ if (payload_sz >
+ sizeof(struct vmbus_channel_packet_multipage_buffer))
+ kfree(payload);
+}
+
+static void storvsc_on_io_completion(struct hv_device *device,
+ struct vstor_packet *vstor_packet,
+ struct storvsc_cmd_request *request)
+{
+ struct storvsc_device *stor_device;
+ struct vstor_packet *stor_pkt;
+
+ stor_device = hv_get_drvdata(device);
+ stor_pkt = &request->vstor_packet;
+
+ /*
+ * The current SCSI handling on the host side does
+ * not correctly handle:
+ * INQUIRY command with page code parameter set to 0x80
+ * MODE_SENSE command with cmd[2] == 0x1c
+ *
+ * Setup srb and scsi status so this won't be fatal.
+ * We do this so we can distinguish truly fatal failues
+ * (srb status == 0x4) and off-line the device in that case.
+ */
+
+ if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
+ (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
+ vstor_packet->vm_srb.scsi_status = 0;
+ vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
+ }
+
+
+ /* Copy over the status...etc */
+ stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
+ stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
+ stor_pkt->vm_srb.sense_info_length =
+ vstor_packet->vm_srb.sense_info_length;
+
+
+ if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
+ /* CHECK_CONDITION */
+ if (vstor_packet->vm_srb.srb_status &
+ SRB_STATUS_AUTOSENSE_VALID) {
+ /* autosense data available */
+
+ memcpy(request->cmd->sense_buffer,
+ vstor_packet->vm_srb.sense_data,
+ vstor_packet->vm_srb.sense_info_length);
+
+ }
+ }
+
+ stor_pkt->vm_srb.data_transfer_length =
+ vstor_packet->vm_srb.data_transfer_length;
+
+ storvsc_command_completion(request);
+
+ if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
+ stor_device->drain_notify)
+ wake_up(&stor_device->waiting_to_drain);
+
+
+}
+
+static void storvsc_on_receive(struct hv_device *device,
+ struct vstor_packet *vstor_packet,
+ struct storvsc_cmd_request *request)
+{
+ struct storvsc_scan_work *work;
+ struct storvsc_device *stor_device;
+
+ switch (vstor_packet->operation) {
+ case VSTOR_OPERATION_COMPLETE_IO:
+ storvsc_on_io_completion(device, vstor_packet, request);
+ break;
+
+ case VSTOR_OPERATION_REMOVE_DEVICE:
+ case VSTOR_OPERATION_ENUMERATE_BUS:
+ stor_device = get_in_stor_device(device);
+ work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
+ if (!work)
+ return;
+
+ INIT_WORK(&work->work, storvsc_host_scan);
+ work->host = stor_device->host;
+ schedule_work(&work->work);
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void storvsc_on_channel_callback(void *context)
+{
+ struct vmbus_channel *channel = (struct vmbus_channel *)context;
+ struct hv_device *device;
+ struct storvsc_device *stor_device;
+ u32 bytes_recvd;
+ u64 request_id;
+ unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
+ struct storvsc_cmd_request *request;
+ int ret;
+
+ if (channel->primary_channel != NULL)
+ device = channel->primary_channel->device_obj;
+ else
+ device = channel->device_obj;
+
+ stor_device = get_in_stor_device(device);
+ if (!stor_device)
+ return;
+
+ do {
+ ret = vmbus_recvpacket(channel, packet,
+ ALIGN((sizeof(struct vstor_packet) -
+ vmscsi_size_delta), 8),
+ &bytes_recvd, &request_id);
+ if (ret == 0 && bytes_recvd > 0) {
+
+ request = (struct storvsc_cmd_request *)
+ (unsigned long)request_id;
+
+ if ((request == &stor_device->init_request) ||
+ (request == &stor_device->reset_request)) {
+
+ memcpy(&request->vstor_packet, packet,
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta));
+ complete(&request->wait_event);
+ } else {
+ storvsc_on_receive(device,
+ (struct vstor_packet *)packet,
+ request);
+ }
+ } else {
+ break;
+ }
+ } while (1);
+
+ return;
+}
+
+static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
+{
+ struct vmstorage_channel_properties props;
+ int ret;
+
+ memset(&props, 0, sizeof(struct vmstorage_channel_properties));
+
+ ret = vmbus_open(device->channel,
+ ring_size,
+ ring_size,
+ (void *)&props,
+ sizeof(struct vmstorage_channel_properties),
+ storvsc_on_channel_callback, device->channel);
+
+ if (ret != 0)
+ return ret;
+
+ ret = storvsc_channel_init(device);
+
+ return ret;
+}
+
+static int storvsc_dev_remove(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+ unsigned long flags;
+
+ stor_device = hv_get_drvdata(device);
+
+ spin_lock_irqsave(&device->channel->inbound_lock, flags);
+ stor_device->destroy = true;
+ spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+
+ /*
+ * At this point, all outbound traffic should be disable. We
+ * only allow inbound traffic (responses) to proceed so that
+ * outstanding requests can be completed.
+ */
+
+ storvsc_wait_to_drain(stor_device);
+
+ /*
+ * Since we have already drained, we don't need to busy wait
+ * as was done in final_release_stor_device()
+ * Note that we cannot set the ext pointer to NULL until
+ * we have drained - to drain the outgoing packets, we need to
+ * allow incoming packets.
+ */
+ spin_lock_irqsave(&device->channel->inbound_lock, flags);
+ hv_set_drvdata(device, NULL);
+ spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+
+ /* Close the channel */
+ vmbus_close(device->channel);
+
+ kfree(stor_device);
+ return 0;
+}
+
+static int storvsc_do_io(struct hv_device *device,
+ struct storvsc_cmd_request *request)
+{
+ struct storvsc_device *stor_device;
+ struct vstor_packet *vstor_packet;
+ struct vmbus_channel *outgoing_channel;
+ int ret = 0;
+
+ vstor_packet = &request->vstor_packet;
+ stor_device = get_out_stor_device(device);
+
+ if (!stor_device)
+ return -ENODEV;
+
+
+ request->device = device;
+ /*
+ * Select an an appropriate channel to send the request out.
+ */
+
+ outgoing_channel = vmbus_get_outgoing_channel(device->channel);
+
+
+ vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
+
+ vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
+ vmscsi_size_delta);
+
+
+ vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
+
+
+ vstor_packet->vm_srb.data_transfer_length =
+ request->payload->range.len;
+
+ vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
+
+ if (request->payload->range.len) {
+
+ ret = vmbus_sendpacket_mpb_desc(outgoing_channel,
+ request->payload, request->payload_sz,
+ vstor_packet,
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
+ (unsigned long)request);
+ } else {
+ ret = vmbus_sendpacket(outgoing_channel, vstor_packet,
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ }
+
+ if (ret != 0)
+ return ret;
+
+ atomic_inc(&stor_device->num_outstanding_req);
+
+ return ret;
+}
+
+static int storvsc_device_configure(struct scsi_device *sdevice)
+{
+
+ blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
+
+ blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
+
+ blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
+
+ sdevice->no_write_same = 1;
+
+ /*
+ * Add blist flags to permit the reading of the VPD pages even when
+ * the target may claim SPC-2 compliance. MSFT targets currently
+ * claim SPC-2 compliance while they implement post SPC-2 features.
+ * With this patch we can correctly handle WRITE_SAME_16 issues.
+ */
+ sdevice->sdev_bflags |= msft_blist_flags;
+
+ /*
+ * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
+ * if the device is a MSFT virtual device.
+ */
+ if (!strncmp(sdevice->vendor, "Msft", 4)) {
+ switch (vmbus_proto_version) {
+ case VERSION_WIN8:
+ case VERSION_WIN8_1:
+ sdevice->scsi_level = SCSI_SPC_3;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
+ sector_t capacity, int *info)
+{
+ sector_t nsect = capacity;
+ sector_t cylinders = nsect;
+ int heads, sectors_pt;
+
+ /*
+ * We are making up these values; let us keep it simple.
+ */
+ heads = 0xff;
+ sectors_pt = 0x3f; /* Sectors per track */
+ sector_div(cylinders, heads * sectors_pt);
+ if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
+ cylinders = 0xffff;
+
+ info[0] = heads;
+ info[1] = sectors_pt;
+ info[2] = (int)cylinders;
+
+ return 0;
+}
+
+static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
+{
+ struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
+ struct hv_device *device = host_dev->dev;
+
+ struct storvsc_device *stor_device;
+ struct storvsc_cmd_request *request;
+ struct vstor_packet *vstor_packet;
+ int ret, t;
+
+
+ stor_device = get_out_stor_device(device);
+ if (!stor_device)
+ return FAILED;
+
+ request = &stor_device->reset_request;
+ vstor_packet = &request->vstor_packet;
+
+ init_completion(&request->wait_event);
+
+ vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+ vstor_packet->vm_srb.path_id = stor_device->path_id;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
+ (unsigned long)&stor_device->reset_request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ if (ret != 0)
+ return FAILED;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0)
+ return TIMEOUT_ERROR;
+
+
+ /*
+ * At this point, all outstanding requests in the adapter
+ * should have been flushed out and return to us
+ * There is a potential race here where the host may be in
+ * the process of responding when we return from here.
+ * Just wait for all in-transit packets to be accounted for
+ * before we return from here.
+ */
+ storvsc_wait_to_drain(stor_device);
+
+ return SUCCESS;
+}
+
+/*
+ * The host guarantees to respond to each command, although I/O latencies might
+ * be unbounded on Azure. Reset the timer unconditionally to give the host a
+ * chance to perform EH.
+ */
+static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
+{
+ return BLK_EH_RESET_TIMER;
+}
+
+static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
+{
+ bool allowed = true;
+ u8 scsi_op = scmnd->cmnd[0];
+
+ switch (scsi_op) {
+ /* the host does not handle WRITE_SAME, log accident usage */
+ case WRITE_SAME:
+ /*
+ * smartd sends this command and the host does not handle
+ * this. So, don't send it.
+ */
+ case SET_WINDOW:
+ scmnd->result = ILLEGAL_REQUEST << 16;
+ allowed = false;
+ break;
+ default:
+ break;
+ }
+ return allowed;
+}
+
+static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
+{
+ int ret;
+ struct hv_host_device *host_dev = shost_priv(host);
+ struct hv_device *dev = host_dev->dev;
+ struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd);
+ int i;
+ struct scatterlist *sgl;
+ unsigned int sg_count = 0;
+ struct vmscsi_request *vm_srb;
+ struct scatterlist *cur_sgl;
+ struct vmbus_packet_mpb_array *payload;
+ u32 payload_sz;
+ u32 length;
+
+ if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
+ /*
+ * On legacy hosts filter unimplemented commands.
+ * Future hosts are expected to correctly handle
+ * unsupported commands. Furthermore, it is
+ * possible that some of the currently
+ * unsupported commands maybe supported in
+ * future versions of the host.
+ */
+ if (!storvsc_scsi_cmd_ok(scmnd)) {
+ scmnd->scsi_done(scmnd);
+ return 0;
+ }
+ }
+
+ /* Setup the cmd request */
+ cmd_request->cmd = scmnd;
+
+ vm_srb = &cmd_request->vstor_packet.vm_srb;
+ vm_srb->win8_extension.time_out_value = 60;
+
+ vm_srb->win8_extension.srb_flags |=
+ (SRB_FLAGS_QUEUE_ACTION_ENABLE |
+ SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
+
+ /* Build the SRB */
+ switch (scmnd->sc_data_direction) {
+ case DMA_TO_DEVICE:
+ vm_srb->data_in = WRITE_TYPE;
+ vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
+ break;
+ case DMA_FROM_DEVICE:
+ vm_srb->data_in = READ_TYPE;
+ vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
+ break;
+ default:
+ vm_srb->data_in = UNKNOWN_TYPE;
+ vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER;
+ break;
+ }
+
+
+ vm_srb->port_number = host_dev->port;
+ vm_srb->path_id = scmnd->device->channel;
+ vm_srb->target_id = scmnd->device->id;
+ vm_srb->lun = scmnd->device->lun;
+
+ vm_srb->cdb_length = scmnd->cmd_len;
+
+ memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
+
+ sgl = (struct scatterlist *)scsi_sglist(scmnd);
+ sg_count = scsi_sg_count(scmnd);
+
+ length = scsi_bufflen(scmnd);
+ payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb;
+ payload_sz = sizeof(cmd_request->mpb);
+
+ if (sg_count) {
+ /* check if we need to bounce the sgl */
+ if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
+ cmd_request->bounce_sgl =
+ create_bounce_buffer(sgl, sg_count,
+ length,
+ vm_srb->data_in);
+ if (!cmd_request->bounce_sgl)
+ return SCSI_MLQUEUE_HOST_BUSY;
+
+ cmd_request->bounce_sgl_count =
+ ALIGN(length, PAGE_SIZE) >> PAGE_SHIFT;
+
+ if (vm_srb->data_in == WRITE_TYPE)
+ copy_to_bounce_buffer(sgl,
+ cmd_request->bounce_sgl, sg_count);
+
+ sgl = cmd_request->bounce_sgl;
+ sg_count = cmd_request->bounce_sgl_count;
+ }
+
+
+ if (sg_count > MAX_PAGE_BUFFER_COUNT) {
+
+ payload_sz = (sg_count * sizeof(void *) +
+ sizeof(struct vmbus_packet_mpb_array));
+ payload = kmalloc(payload_sz, GFP_ATOMIC);
+ if (!payload) {
+ if (cmd_request->bounce_sgl_count)
+ destroy_bounce_buffer(
+ cmd_request->bounce_sgl,
+ cmd_request->bounce_sgl_count);
+
+ return SCSI_MLQUEUE_DEVICE_BUSY;
+ }
+ }
+
+ payload->range.len = length;
+ payload->range.offset = sgl[0].offset;
+
+ cur_sgl = sgl;
+ for (i = 0; i < sg_count; i++) {
+ payload->range.pfn_array[i] =
+ page_to_pfn(sg_page((cur_sgl)));
+ cur_sgl = sg_next(cur_sgl);
+ }
+
+ } else if (scsi_sglist(scmnd)) {
+ payload->range.len = length;
+ payload->range.offset =
+ virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
+ payload->range.pfn_array[0] =
+ virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
+ }
+
+ cmd_request->payload = payload;
+ cmd_request->payload_sz = payload_sz;
+
+ /* Invokes the vsc to start an IO */
+ ret = storvsc_do_io(dev, cmd_request);
+
+ if (ret == -EAGAIN) {
+ /* no more space */
+
+ if (cmd_request->bounce_sgl_count)
+ destroy_bounce_buffer(cmd_request->bounce_sgl,
+ cmd_request->bounce_sgl_count);
+
+ return SCSI_MLQUEUE_DEVICE_BUSY;
+ }
+
+ return 0;
+}
+
+static struct scsi_host_template scsi_driver = {
+ .module = THIS_MODULE,
+ .name = "storvsc_host_t",
+ .cmd_size = sizeof(struct storvsc_cmd_request),
+ .bios_param = storvsc_get_chs,
+ .queuecommand = storvsc_queuecommand,
+ .eh_host_reset_handler = storvsc_host_reset_handler,
+ .proc_name = "storvsc_host",
+ .eh_timed_out = storvsc_eh_timed_out,
+ .slave_configure = storvsc_device_configure,
+ .cmd_per_lun = 255,
+ .this_id = -1,
+ .use_clustering = ENABLE_CLUSTERING,
+ /* Make sure we dont get a sg segment crosses a page boundary */
+ .dma_boundary = PAGE_SIZE-1,
+ .no_write_same = 1,
+};
+
+enum {
+ SCSI_GUID,
+ IDE_GUID,
+ SFC_GUID,
+};
+
+static const struct hv_vmbus_device_id id_table[] = {
+ /* SCSI guid */
+ { HV_SCSI_GUID,
+ .driver_data = SCSI_GUID
+ },
+ /* IDE guid */
+ { HV_IDE_GUID,
+ .driver_data = IDE_GUID
+ },
+ /* Fibre Channel GUID */
+ {
+ HV_SYNTHFC_GUID,
+ .driver_data = SFC_GUID
+ },
+ { },
+};
+
+MODULE_DEVICE_TABLE(vmbus, id_table);
+
+static int storvsc_probe(struct hv_device *device,
+ const struct hv_vmbus_device_id *dev_id)
+{
+ int ret;
+ int num_cpus = num_online_cpus();
+ struct Scsi_Host *host;
+ struct hv_host_device *host_dev;
+ bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
+ int target = 0;
+ struct storvsc_device *stor_device;
+ int max_luns_per_target;
+ int max_targets;
+ int max_channels;
+ int max_sub_channels = 0;
+
+ /*
+ * Based on the windows host we are running on,
+ * set state to properly communicate with the host.
+ */
+
+ switch (vmbus_proto_version) {
+ case VERSION_WS2008:
+ case VERSION_WIN7:
+ sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
+ vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
+ vmstor_current_major = VMSTOR_WIN7_MAJOR;
+ vmstor_current_minor = VMSTOR_WIN7_MINOR;
+ max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET;
+ max_targets = STORVSC_IDE_MAX_TARGETS;
+ max_channels = STORVSC_IDE_MAX_CHANNELS;
+ break;
+ default:
+ sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
+ vmscsi_size_delta = 0;
+ vmstor_current_major = VMSTOR_WIN8_MAJOR;
+ vmstor_current_minor = VMSTOR_WIN8_MINOR;
+ max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET;
+ max_targets = STORVSC_MAX_TARGETS;
+ max_channels = STORVSC_MAX_CHANNELS;
+ /*
+ * On Windows8 and above, we support sub-channels for storage.
+ * The number of sub-channels offerred is based on the number of
+ * VCPUs in the guest.
+ */
+ max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel);
+ break;
+ }
+
+ scsi_driver.can_queue = (max_outstanding_req_per_channel *
+ (max_sub_channels + 1));
+
+ host = scsi_host_alloc(&scsi_driver,
+ sizeof(struct hv_host_device));
+ if (!host)
+ return -ENOMEM;
+
+ host_dev = shost_priv(host);
+ memset(host_dev, 0, sizeof(struct hv_host_device));
+
+ host_dev->port = host->host_no;
+ host_dev->dev = device;
+
+
+ stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
+ if (!stor_device) {
+ ret = -ENOMEM;
+ goto err_out0;
+ }
+
+ stor_device->destroy = false;
+ stor_device->open_sub_channel = false;
+ init_waitqueue_head(&stor_device->waiting_to_drain);
+ stor_device->device = device;
+ stor_device->host = host;
+ hv_set_drvdata(device, stor_device);
+
+ stor_device->port_number = host->host_no;
+ ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
+ if (ret)
+ goto err_out1;
+
+ host_dev->path = stor_device->path_id;
+ host_dev->target = stor_device->target_id;
+
+ switch (dev_id->driver_data) {
+ case SFC_GUID:
+ host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET;
+ host->max_id = STORVSC_FC_MAX_TARGETS;
+ host->max_channel = STORVSC_FC_MAX_CHANNELS - 1;
+ break;
+
+ case SCSI_GUID:
+ host->max_lun = max_luns_per_target;
+ host->max_id = max_targets;
+ host->max_channel = max_channels - 1;
+ break;
+
+ default:
+ host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET;
+ host->max_id = STORVSC_IDE_MAX_TARGETS;
+ host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1;
+ break;
+ }
+ /* max cmd length */
+ host->max_cmd_len = STORVSC_MAX_CMD_LEN;
+
+ /*
+ * set the table size based on the info we got
+ * from the host.
+ */
+ host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT);
+
+ /* Register the HBA and start the scsi bus scan */
+ ret = scsi_add_host(host, &device->device);
+ if (ret != 0)
+ goto err_out2;
+
+ if (!dev_is_ide) {
+ scsi_scan_host(host);
+ } else {
+ target = (device->dev_instance.b[5] << 8 |
+ device->dev_instance.b[4]);
+ ret = scsi_add_device(host, 0, target, 0);
+ if (ret) {
+ scsi_remove_host(host);
+ goto err_out2;
+ }
+ }
+ return 0;
+
+err_out2:
+ /*
+ * Once we have connected with the host, we would need to
+ * to invoke storvsc_dev_remove() to rollback this state and
+ * this call also frees up the stor_device; hence the jump around
+ * err_out1 label.
+ */
+ storvsc_dev_remove(device);
+ goto err_out0;
+
+err_out1:
+ kfree(stor_device);
+
+err_out0:
+ scsi_host_put(host);
+ return ret;
+}
+
+static int storvsc_remove(struct hv_device *dev)
+{
+ struct storvsc_device *stor_device = hv_get_drvdata(dev);
+ struct Scsi_Host *host = stor_device->host;
+
+ scsi_remove_host(host);
+ storvsc_dev_remove(dev);
+ scsi_host_put(host);
+
+ return 0;
+}
+
+static struct hv_driver storvsc_drv = {
+ .name = KBUILD_MODNAME,
+ .id_table = id_table,
+ .probe = storvsc_probe,
+ .remove = storvsc_remove,
+};
+
+static int __init storvsc_drv_init(void)
+{
+
+ /*
+ * Divide the ring buffer data size (which is 1 page less
+ * than the ring buffer size since that page is reserved for
+ * the ring buffer indices) by the max request size (which is
+ * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
+ */
+ max_outstanding_req_per_channel =
+ ((storvsc_ringbuffer_size - PAGE_SIZE) /
+ ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
+ sizeof(struct vstor_packet) + sizeof(u64) -
+ vmscsi_size_delta,
+ sizeof(u64)));
+
+ return vmbus_driver_register(&storvsc_drv);
+}
+
+static void __exit storvsc_drv_exit(void)
+{
+ vmbus_driver_unregister(&storvsc_drv);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
+module_init(storvsc_drv_init);
+module_exit(storvsc_drv_exit);