Staging: hv: storvsc: Include storvsc.c in storvsc_drv.c
authorK. Y. Srinivasan <kys@microsoft.com>
Sat, 27 Aug 2011 18:31:22 +0000 (11:31 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Mon, 29 Aug 2011 18:01:07 +0000 (11:01 -0700)
As part of further cleanup of our storage drivers, include the content
of storvsc.c into storvsc_drv.c and delete storvsc.c and do the necessary
adjustments.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/staging/hv/Makefile
drivers/staging/hv/storvsc.c [deleted file]
drivers/staging/hv/storvsc_drv.c

index bb89437..bd176b1 100644 (file)
@@ -7,6 +7,6 @@ obj-$(CONFIG_HYPERV_MOUSE)      += hv_mouse.o
 hv_vmbus-y := vmbus_drv.o \
                 hv.o connection.o channel.o \
                 channel_mgmt.o ring_buffer.o
-hv_storvsc-y := storvsc_drv.o storvsc.o
+hv_storvsc-y := storvsc_drv.o
 hv_netvsc-y := netvsc_drv.o netvsc.o rndis_filter.o
 hv_utils-y := hv_util.o hv_kvp.o
diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
deleted file mode 100644 (file)
index fb7b3ca..0000000
+++ /dev/null
@@ -1,528 +0,0 @@
-/*
- * 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/sched.h>
-#include <linux/completion.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include <linux/delay.h>
-
-#include "hyperv.h"
-#include "hyperv_storage.h"
-
-
-static inline struct storvsc_device *alloc_stor_device(struct hv_device *device)
-{
-       struct storvsc_device *stor_device;
-
-       stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
-       if (!stor_device)
-               return NULL;
-
-       stor_device->destroy = false;
-       init_waitqueue_head(&stor_device->waiting_to_drain);
-       stor_device->device = device;
-       device->ext = stor_device;
-
-       return stor_device;
-}
-
-
-static inline struct storvsc_device *get_in_stor_device(
-                                       struct hv_device *device)
-{
-       struct storvsc_device *stor_device;
-       unsigned long flags;
-
-       spin_lock_irqsave(&device->channel->inbound_lock, flags);
-       stor_device = (struct storvsc_device *)device->ext;
-
-       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:
-       spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
-       return stor_device;
-
-}
-
-static int storvsc_channel_init(struct hv_device *device)
-{
-       struct storvsc_device *stor_device;
-       struct hv_storvsc_request *request;
-       struct vstor_packet *vstor_packet;
-       int ret, t;
-
-       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 hv_storvsc_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),
-                              (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 = VMSTOR_PROTOCOL_VERSION_CURRENT;
-       FILL_VMSTOR_REVISION(vstor_packet->version.revision);
-
-       ret = vmbus_sendpacket(device->channel, vstor_packet,
-                              sizeof(struct vstor_packet),
-                              (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;
-       vstor_packet->storage_channel_properties.port_number =
-                                       stor_device->port_number;
-
-       ret = vmbus_sendpacket(device->channel, vstor_packet,
-                              sizeof(struct vstor_packet),
-                              (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;
-
-       stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
-       stor_device->target_id
-               = vstor_packet->storage_channel_properties.target_id;
-
-       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),
-                              (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;
-
-
-cleanup:
-       return ret;
-}
-
-static void storvsc_on_io_completion(struct hv_device *device,
-                                 struct vstor_packet *vstor_packet,
-                                 struct hv_storvsc_request *request)
-{
-       struct storvsc_device *stor_device;
-       struct vstor_packet *stor_pkt;
-
-       stor_device = (struct storvsc_device *)device->ext;
-
-       stor_pkt = &request->vstor_packet;
-
-
-       /* 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 != 0 ||
-               vstor_packet->vm_srb.srb_status != 1){
-               DPRINT_WARN(STORVSC,
-                           "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
-                           stor_pkt->vm_srb.cdb[0],
-                           vstor_packet->vm_srb.scsi_status,
-                           vstor_packet->vm_srb.srb_status);
-       }
-
-       if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
-               /* CHECK_CONDITION */
-               if (vstor_packet->vm_srb.srb_status & 0x80) {
-                       /* autosense data available */
-                       DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data "
-                                   "valid - len %d\n", request,
-                                   vstor_packet->vm_srb.sense_info_length);
-
-                       memcpy(request->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;
-
-       request->on_io_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 hv_storvsc_request *request)
-{
-       switch (vstor_packet->operation) {
-       case VSTOR_OPERATION_COMPLETE_IO:
-               storvsc_on_io_completion(device, vstor_packet, request);
-               break;
-       case VSTOR_OPERATION_REMOVE_DEVICE:
-
-       default:
-               break;
-       }
-}
-
-static void storvsc_on_channel_callback(void *context)
-{
-       struct hv_device *device = (struct hv_device *)context;
-       struct storvsc_device *stor_device;
-       u32 bytes_recvd;
-       u64 request_id;
-       unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
-       struct hv_storvsc_request *request;
-       int ret;
-
-
-       stor_device = get_in_stor_device(device);
-       if (!stor_device)
-               return;
-
-       do {
-               ret = vmbus_recvpacket(device->channel, packet,
-                                      ALIGN(sizeof(struct vstor_packet), 8),
-                                      &bytes_recvd, &request_id);
-               if (ret == 0 && bytes_recvd > 0) {
-
-                       request = (struct hv_storvsc_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));
-                               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));
-
-       /* Open the channel */
-       ret = vmbus_open(device->channel,
-                        ring_size,
-                        ring_size,
-                        (void *)&props,
-                        sizeof(struct vmstorage_channel_properties),
-                        storvsc_on_channel_callback, device);
-
-       if (ret != 0)
-               return ret;
-
-       ret = storvsc_channel_init(device);
-
-       return ret;
-}
-
-int storvsc_dev_add(struct hv_device *device,
-                                       void *additional_info)
-{
-       struct storvsc_device *stor_device;
-       struct storvsc_device_info *device_info;
-       int ret = 0;
-
-       device_info = (struct storvsc_device_info *)additional_info;
-       stor_device = alloc_stor_device(device);
-       if (!stor_device)
-               return -ENOMEM;
-
-       /* Save the channel properties to our storvsc channel */
-
-       /*
-        * If we support more than 1 scsi channel, we need to set the
-        * port number here to the scsi channel but how do we get the
-        * scsi channel prior to the bus scan.
-        *
-        * The host does not support this.
-        */
-
-       stor_device->port_number = device_info->port_number;
-       /* Send it back up */
-       ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size);
-       if (ret) {
-               kfree(stor_device);
-               return ret;
-       }
-       device_info->path_id = stor_device->path_id;
-       device_info->target_id = stor_device->target_id;
-
-       return ret;
-}
-
-int storvsc_dev_remove(struct hv_device *device)
-{
-       struct storvsc_device *stor_device;
-       unsigned long flags;
-
-       stor_device = (struct storvsc_device *)device->ext;
-
-       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);
-       device->ext = NULL;
-       spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
-
-       /* Close the channel */
-       vmbus_close(device->channel);
-
-       kfree(stor_device);
-       return 0;
-}
-
-int storvsc_do_io(struct hv_device *device,
-                             struct hv_storvsc_request *request)
-{
-       struct storvsc_device *stor_device;
-       struct vstor_packet *vstor_packet;
-       int ret = 0;
-
-       vstor_packet = &request->vstor_packet;
-       stor_device = get_out_stor_device(device);
-
-       if (!stor_device)
-               return -ENODEV;
-
-
-       request->device  = device;
-
-
-       vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
-
-       vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
-
-
-       vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE;
-
-
-       vstor_packet->vm_srb.data_transfer_length =
-       request->data_buffer.len;
-
-       vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
-
-       if (request->data_buffer.len) {
-               ret = vmbus_sendpacket_multipagebuffer(device->channel,
-                               &request->data_buffer,
-                               vstor_packet,
-                               sizeof(struct vstor_packet),
-                               (unsigned long)request);
-       } else {
-               ret = vmbus_sendpacket(device->channel, vstor_packet,
-                                      sizeof(struct vstor_packet),
-                                      (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;
-}
-
-/*
- * The channel properties uniquely specify how the device is to be
- * presented to the guest. Map this information for use by the block
- * driver. For Linux guests on Hyper-V, we emulate a scsi HBA in the guest
- * (storvsc_drv) and so scsi devices in the guest  are handled by
- * native upper level Linux drivers. Consequently, Hyper-V
- * block driver, while being a generic block driver, presently does not
- * deal with anything other than devices that would need to be presented
- * to the guest as an IDE disk.
- *
- * This function maps the channel properties as embedded in the input
- * parameter device_info onto information necessary to register the
- * corresponding block device.
- *
- * Currently, there is no way to stop the emulation of the block device
- * on the host side. And so, to prevent the native IDE drivers in Linux
- * from taking over these devices (to be managedby Hyper-V block
- * driver), we will take over if need be the major of the IDE controllers.
- *
- */
-
-int storvsc_get_major_info(struct storvsc_device_info *device_info,
-                           struct storvsc_major_info *major_info)
-{
-       static bool ide0_registered;
-       static bool ide1_registered;
-
-       /*
-        * For now we only support IDE disks.
-        */
-       major_info->devname = "ide";
-       major_info->diskname = "hd";
-
-       if (device_info->path_id) {
-               major_info->major = 22;
-               if (!ide1_registered) {
-                       major_info->do_register = true;
-                       ide1_registered = true;
-               } else
-                       major_info->do_register = false;
-
-               if (device_info->target_id)
-                       major_info->index = 3;
-               else
-                       major_info->index = 2;
-
-               return 0;
-       } else {
-               major_info->major = 3;
-               if (!ide0_registered) {
-                       major_info->do_register = true;
-                       ide0_registered = true;
-               } else
-                       major_info->do_register = false;
-
-               if (device_info->target_id)
-                       major_info->index = 1;
-               else
-                       major_info->index = 0;
-
-               return 0;
-       }
-
-       return -ENODEV;
-}
index 3e00e70..ddb31cf 100644 (file)
 #include "hyperv.h"
 #include "hyperv_storage.h"
 
+
+/*
+ * 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/sched.h>
+#include <linux/completion.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+
+#include "hyperv.h"
+#include "hyperv_storage.h"
+
+
+static inline struct storvsc_device *alloc_stor_device(struct hv_device *device)
+{
+       struct storvsc_device *stor_device;
+
+       stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
+       if (!stor_device)
+               return NULL;
+
+       stor_device->destroy = false;
+       init_waitqueue_head(&stor_device->waiting_to_drain);
+       stor_device->device = device;
+       device->ext = stor_device;
+
+       return stor_device;
+}
+
+
+static inline struct storvsc_device *get_in_stor_device(
+                                       struct hv_device *device)
+{
+       struct storvsc_device *stor_device;
+       unsigned long flags;
+
+       spin_lock_irqsave(&device->channel->inbound_lock, flags);
+       stor_device = (struct storvsc_device *)device->ext;
+
+       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:
+       spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+       return stor_device;
+
+}
+
+static int storvsc_channel_init(struct hv_device *device)
+{
+       struct storvsc_device *stor_device;
+       struct hv_storvsc_request *request;
+       struct vstor_packet *vstor_packet;
+       int ret, t;
+
+       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 hv_storvsc_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),
+                              (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 = VMSTOR_PROTOCOL_VERSION_CURRENT;
+       FILL_VMSTOR_REVISION(vstor_packet->version.revision);
+
+       ret = vmbus_sendpacket(device->channel, vstor_packet,
+                              sizeof(struct vstor_packet),
+                              (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;
+       vstor_packet->storage_channel_properties.port_number =
+                                       stor_device->port_number;
+
+       ret = vmbus_sendpacket(device->channel, vstor_packet,
+                              sizeof(struct vstor_packet),
+                              (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;
+
+       stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
+       stor_device->target_id
+               = vstor_packet->storage_channel_properties.target_id;
+
+       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),
+                              (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;
+
+
+cleanup:
+       return ret;
+}
+
+static void storvsc_on_io_completion(struct hv_device *device,
+                                 struct vstor_packet *vstor_packet,
+                                 struct hv_storvsc_request *request)
+{
+       struct storvsc_device *stor_device;
+       struct vstor_packet *stor_pkt;
+
+       stor_device = (struct storvsc_device *)device->ext;
+
+       stor_pkt = &request->vstor_packet;
+
+
+       /* 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 != 0 ||
+               vstor_packet->vm_srb.srb_status != 1){
+               DPRINT_WARN(STORVSC,
+                           "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
+                           stor_pkt->vm_srb.cdb[0],
+                           vstor_packet->vm_srb.scsi_status,
+                           vstor_packet->vm_srb.srb_status);
+       }
+
+       if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
+               /* CHECK_CONDITION */
+               if (vstor_packet->vm_srb.srb_status & 0x80) {
+                       /* autosense data available */
+                       DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data "
+                                   "valid - len %d\n", request,
+                                   vstor_packet->vm_srb.sense_info_length);
+
+                       memcpy(request->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;
+
+       request->on_io_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 hv_storvsc_request *request)
+{
+       switch (vstor_packet->operation) {
+       case VSTOR_OPERATION_COMPLETE_IO:
+               storvsc_on_io_completion(device, vstor_packet, request);
+               break;
+       case VSTOR_OPERATION_REMOVE_DEVICE:
+
+       default:
+               break;
+       }
+}
+
+static void storvsc_on_channel_callback(void *context)
+{
+       struct hv_device *device = (struct hv_device *)context;
+       struct storvsc_device *stor_device;
+       u32 bytes_recvd;
+       u64 request_id;
+       unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
+       struct hv_storvsc_request *request;
+       int ret;
+
+
+       stor_device = get_in_stor_device(device);
+       if (!stor_device)
+               return;
+
+       do {
+               ret = vmbus_recvpacket(device->channel, packet,
+                                      ALIGN(sizeof(struct vstor_packet), 8),
+                                      &bytes_recvd, &request_id);
+               if (ret == 0 && bytes_recvd > 0) {
+
+                       request = (struct hv_storvsc_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));
+                               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));
+
+       /* Open the channel */
+       ret = vmbus_open(device->channel,
+                        ring_size,
+                        ring_size,
+                        (void *)&props,
+                        sizeof(struct vmstorage_channel_properties),
+                        storvsc_on_channel_callback, device);
+
+       if (ret != 0)
+               return ret;
+
+       ret = storvsc_channel_init(device);
+
+       return ret;
+}
+
+int storvsc_dev_add(struct hv_device *device,
+                                       void *additional_info)
+{
+       struct storvsc_device *stor_device;
+       struct storvsc_device_info *device_info;
+       int ret = 0;
+
+       device_info = (struct storvsc_device_info *)additional_info;
+       stor_device = alloc_stor_device(device);
+       if (!stor_device)
+               return -ENOMEM;
+
+       /* Save the channel properties to our storvsc channel */
+
+       /*
+        * If we support more than 1 scsi channel, we need to set the
+        * port number here to the scsi channel but how do we get the
+        * scsi channel prior to the bus scan.
+        *
+        * The host does not support this.
+        */
+
+       stor_device->port_number = device_info->port_number;
+       /* Send it back up */
+       ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size);
+       if (ret) {
+               kfree(stor_device);
+               return ret;
+       }
+       device_info->path_id = stor_device->path_id;
+       device_info->target_id = stor_device->target_id;
+
+       return ret;
+}
+
+int storvsc_dev_remove(struct hv_device *device)
+{
+       struct storvsc_device *stor_device;
+       unsigned long flags;
+
+       stor_device = (struct storvsc_device *)device->ext;
+
+       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);
+       device->ext = NULL;
+       spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+
+       /* Close the channel */
+       vmbus_close(device->channel);
+
+       kfree(stor_device);
+       return 0;
+}
+
+int storvsc_do_io(struct hv_device *device,
+                             struct hv_storvsc_request *request)
+{
+       struct storvsc_device *stor_device;
+       struct vstor_packet *vstor_packet;
+       int ret = 0;
+
+       vstor_packet = &request->vstor_packet;
+       stor_device = get_out_stor_device(device);
+
+       if (!stor_device)
+               return -ENODEV;
+
+
+       request->device  = device;
+
+
+       vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
+
+       vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
+
+
+       vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE;
+
+
+       vstor_packet->vm_srb.data_transfer_length =
+       request->data_buffer.len;
+
+       vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
+
+       if (request->data_buffer.len) {
+               ret = vmbus_sendpacket_multipagebuffer(device->channel,
+                               &request->data_buffer,
+                               vstor_packet,
+                               sizeof(struct vstor_packet),
+                               (unsigned long)request);
+       } else {
+               ret = vmbus_sendpacket(device->channel, vstor_packet,
+                              sizeof(struct vstor_packet),
+                              (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;
+}
+
+/*
+ * The channel properties uniquely specify how the device is to be
+ * presented to the guest. Map this information for use by the block
+ * driver. For Linux guests on Hyper-V, we emulate a scsi HBA in the guest
+ * (storvsc_drv) and so scsi devices in the guest  are handled by
+ * native upper level Linux drivers. Consequently, Hyper-V
+ * block driver, while being a generic block driver, presently does not
+ * deal with anything other than devices that would need to be presented
+ * to the guest as an IDE disk.
+ *
+ * This function maps the channel properties as embedded in the input
+ * parameter device_info onto information necessary to register the
+ * corresponding block device.
+ *
+ * Currently, there is no way to stop the emulation of the block device
+ * on the host side. And so, to prevent the native IDE drivers in Linux
+ * from taking over these devices (to be managedby Hyper-V block
+ * driver), we will take over if need be the major of the IDE controllers.
+ *
+ */
+
+int storvsc_get_major_info(struct storvsc_device_info *device_info,
+                           struct storvsc_major_info *major_info)
+{
+       static bool ide0_registered;
+       static bool ide1_registered;
+
+       /*
+        * For now we only support IDE disks.
+        */
+       major_info->devname = "ide";
+       major_info->diskname = "hd";
+
+       if (device_info->path_id) {
+               major_info->major = 22;
+               if (!ide1_registered) {
+                       major_info->do_register = true;
+                       ide1_registered = true;
+               } else
+                       major_info->do_register = false;
+
+               if (device_info->target_id)
+                       major_info->index = 3;
+               else
+                       major_info->index = 2;
+
+               return 0;
+       } else {
+               major_info->major = 3;
+               if (!ide0_registered) {
+                       major_info->do_register = true;
+                       ide0_registered = true;
+               } else
+                       major_info->do_register = false;
+
+               if (device_info->target_id)
+                       major_info->index = 1;
+               else
+                       major_info->index = 0;
+
+               return 0;
+       }
+
+       return -ENODEV;
+}
 static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;
 
 module_param(storvsc_ringbuffer_size, int, S_IRUGO);