[PATCH 1/1] Staging: hv: storvsc: Move the storage driver out of staging

[K. Y. Srinivasan]

In preparation for moving the storage driver out of staging, seek community
review of the storage  driver code.

Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
---
 drivers/scsi/Kconfig             |    7 +
 drivers/scsi/Makefile            |    3 +
 drivers/scsi/storvsc_drv.c       | 1480 ++++++++++++++++++++++++++++++++++++++
 drivers/staging/hv/Kconfig       |    6 -
 drivers/staging/hv/Makefile      |    2 -
 drivers/staging/hv/storvsc_drv.c | 1480 --------------------------------------
 6 files changed, 1490 insertions(+), 1488 deletions(-)
 create mode 100644 drivers/scsi/storvsc_drv.c
 delete mode 100644 drivers/staging/hv/storvsc_drv.c

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 8d9dae8..d5a640f 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -666,6 +666,13 @@ config VMWARE_PVSCSI
 	  To compile this driver as a module, choose M here: the
 	  module will be called vmw_pvscsi.
 
+config HYPERV_STORAGE
+	tristate "Microsoft Hyper-V virtual storage driver"
+	depends on SCSI && HYPERV
+	default HYPERV
+	help
+	  Select this option to enable the Hyper-V virtual storage driver.
+
 config LIBFC
 	tristate "LibFC module"
 	select SCSI_FC_ATTRS
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 3c08f53..8d8cf3a 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -141,6 +141,7 @@ obj-$(CONFIG_SCSI_BNX2_ISCSI)	+= libiscsi.o bnx2i/
 obj-$(CONFIG_BE2ISCSI)		+= libiscsi.o be2iscsi/
 obj-$(CONFIG_SCSI_PMCRAID)	+= pmcraid.o
 obj-$(CONFIG_VMWARE_PVSCSI)	+= vmw_pvscsi.o
+obj-$(CONFIG_HYPERV_STORAGE)	+= hv_storvsc.o
 
 obj-$(CONFIG_ARM)		+= arm/
 
@@ -169,6 +170,8 @@ scsi_mod-$(CONFIG_SCSI_PROC_FS)	+= scsi_proc.o
 scsi_mod-y			+= scsi_trace.o
 scsi_mod-$(CONFIG_PM)		+= scsi_pm.o
 
+hv_storvsc-y			:= storvsc_drv.o
+
 scsi_tgt-y			+= scsi_tgt_lib.o scsi_tgt_if.o
 
 sd_mod-objs	:= sd.o
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
new file mode 100644
index 0000000..ae8c33e
--- /dev/null
+++ b/drivers/scsi/storvsc_drv.c
@@ -0,0 +1,1480 @@
+/*
+ * 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@xxxxxxxxxxxxx>
+ *   Hank Janssen  <hjanssen@xxxxxxxxxxxxx>
+ *   K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
+ */
+
+#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 <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>
+
+
+#define STORVSC_RING_BUFFER_SIZE			(20*PAGE_SIZE)
+static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;
+
+module_param(storvsc_ringbuffer_size, int, S_IRUGO);
+MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
+
+/* to alert the user that structure sizes may be mismatched even though the */
+/* protocol versions match. */
+
+
+#define REVISION_STRING(REVISION_) #REVISION_
+#define FILL_VMSTOR_REVISION(RESULT_LVALUE_)				\
+	do {								\
+		char *revision_string					\
+			= REVISION_STRING($Rev : 6 $) + 6;		\
+		RESULT_LVALUE_ = 0;					\
+		while (*revision_string >= '0'				\
+			&& *revision_string <= '9') {			\
+			RESULT_LVALUE_ *= 10;				\
+			RESULT_LVALUE_ += *revision_string - '0';	\
+			revision_string++;				\
+		}							\
+	} while (0)
+
+/* 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). */
+#define VMSTOR_PROTOCOL_MAJOR(VERSION_)		(((VERSION_) >> 8) & 0xff)
+#define VMSTOR_PROTOCOL_MINOR(VERSION_)		(((VERSION_))      & 0xff)
+#define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_)	((((MAJOR_) & 0xff) << 8) | \
+						 (((MINOR_) & 0xff)))
+#define VMSTOR_INVALID_PROTOCOL_VERSION		(-1)
+
+/* Version history: */
+/* V1 Beta                    0.1 */
+/* V1 RC < 2008/1/31          1.0 */
+/* V1 RC > 2008/1/31          2.0 */
+#define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(2, 0)
+
+
+
+
+/*  This will get replaced with the max transfer length that is possible on */
+/*  the host adapter. */
+/*  The max transfer length will be published when we offer a vmbus channel. */
+#define MAX_TRANSFER_LENGTH	0x40000
+#define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) +	\
+			sizeof(struct vstor_packet) +		\
+			sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE)))
+
+
+/*  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_MAXIMUM			= 10
+};
+
+/*
+ * 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 CDB16GENERIC_LENGTH			0x10
+
+#ifndef SENSE_BUFFER_SIZE
+#define SENSE_BUFFER_SIZE			0x12
+#endif
+
+#define MAX_DATA_BUF_LEN_WITH_PADDING		0x14
+
+struct vmscsi_request {
+	unsigned short length;
+	unsigned char srb_status;
+	unsigned char scsi_status;
+
+	unsigned char port_number;
+	unsigned char path_id;
+	unsigned char target_id;
+	unsigned char lun;
+
+	unsigned char cdb_length;
+	unsigned char sense_info_length;
+	unsigned char data_in;
+	unsigned char reserved;
+
+	unsigned int data_transfer_length;
+
+	union {
+		unsigned char cdb[CDB16GENERIC_LENGTH];
+		unsigned char sense_data[SENSE_BUFFER_SIZE];
+		unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING];
+	};
+} __attribute((packed));
+
+
+/*
+ * This structure is sent during the intialization phase to get the different
+ * properties of the channel.
+ */
+struct vmstorage_channel_properties {
+	unsigned short protocol_version;
+	unsigned char path_id;
+	unsigned char target_id;
+
+	/* Note: port number is only really known on the client side */
+	unsigned int port_number;
+	unsigned int flags;
+	unsigned int max_transfer_bytes;
+
+	/*  This id is unique for each channel and will correspond with */
+	/*  vendor specific data in the inquirydata */
+	unsigned long long unique_id;
+} __packed;
+
+/*  This structure is sent during the storage protocol negotiations. */
+struct vmstorage_protocol_version {
+	/* Major (MSW) and minor (LSW) version numbers. */
+	unsigned short 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.
+	 */
+	unsigned short 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 */
+	unsigned int flags;
+
+	/* Status of the request returned from the server side. */
+	unsigned int 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;
+	};
+} __packed;
+
+/* Packet flags */
+/*
+ * This flag indicates that the server should send back a completion for this
+ * packet.
+ */
+#define REQUEST_COMPLETION_FLAG	0x1
+
+/*  This is the set of flags that the vsc can set in any packets it sends */
+#define VSC_LEGAL_FLAGS		(REQUEST_COMPLETION_FLAG)
+
+
+/* Defines */
+
+#define STORVSC_MAX_IO_REQUESTS				128
+
+/*
+ * In Hyper-V, each port/path/target maps to 1 scsi host adapter.  In
+ * reality, the path/target is not used (ie always set to 0) so our
+ * scsi host adapter essentially has 1 bus with 1 target that contains
+ * up to 256 luns.
+ */
+#define STORVSC_MAX_LUNS_PER_TARGET			64
+#define STORVSC_MAX_TARGETS				1
+#define STORVSC_MAX_CHANNELS				1
+#define STORVSC_MAX_CMD_LEN				16
+
+struct hv_storvsc_request;
+
+/* Matches Windows-end */
+enum storvsc_request_type {
+	WRITE_TYPE,
+	READ_TYPE,
+	UNKNOWN_TYPE,
+};
+
+
+struct hv_storvsc_request {
+	struct hv_device *device;
+
+	/* Synchronize the request/response if needed */
+	struct completion wait_event;
+
+	unsigned char *sense_buffer;
+	void *context;
+	void (*on_io_completion)(struct hv_storvsc_request *request);
+	struct hv_multipage_buffer data_buffer;
+
+	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;
+	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;
+
+	/* Used for vsc/vsp channel reset process */
+	struct hv_storvsc_request init_request;
+	struct hv_storvsc_request reset_request;
+};
+
+struct hv_host_device {
+	struct hv_device *dev;
+	struct kmem_cache *request_pool;
+	unsigned int port;
+	unsigned char path;
+	unsigned char target;
+};
+
+struct storvsc_cmd_request {
+	struct list_head entry;
+	struct scsi_cmnd *cmd;
+
+	unsigned int bounce_sgl_count;
+	struct scatterlist *bounce_sgl;
+
+	struct hv_storvsc_request request;
+};
+
+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 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 = 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 = 0x1;
+	}
+
+
+	/* 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){
+		dev_warn(&device->device,
+			 "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 */
+			dev_warn(&device->device,
+				 "stor 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;
+}
+
+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 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;
+}
+
+static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path)
+{
+	*target =
+		dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4];
+
+	*path =
+		dev->dev_instance.b[3] << 24 |
+		dev->dev_instance.b[2] << 16 |
+		dev->dev_instance.b[1] << 8  | dev->dev_instance.b[0];
+}
+
+
+static int storvsc_device_alloc(struct scsi_device *sdevice)
+{
+	/*
+	 * This enables luns to be located sparsely. Otherwise, we may not
+	 * discovered them.
+	 */
+	sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN;
+	return 0;
+}
+
+static int storvsc_merge_bvec(struct request_queue *q,
+			      struct bvec_merge_data *bmd, struct bio_vec *bvec)
+{
+	/* checking done by caller. */
+	return bvec->bv_len;
+}
+
+static int storvsc_device_configure(struct scsi_device *sdevice)
+{
+	scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
+				STORVSC_MAX_IO_REQUESTS);
+
+	blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
+
+	blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec);
+
+	blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
+
+	return 0;
+}
+
+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 i;
+	int num_pages;
+	struct scatterlist *bounce_sgl;
+	struct page *page_buf;
+
+	num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
+
+	bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
+	if (!bounce_sgl)
+		return NULL;
+
+	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, 0, 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)
+{
+	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;
+
+	local_irq_save(flags);
+
+	for (i = 0; i < orig_sgl_count; i++) {
+		dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
+					KM_IRQ0) + orig_sgl[i].offset;
+		dest = dest_addr;
+		destlen = orig_sgl[i].length;
+
+		if (bounce_addr == 0)
+			bounce_addr =
+			(unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
+							KM_IRQ0);
+
+		while (destlen) {
+			src = bounce_addr + bounce_sgl[j].offset;
+			srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
+
+			copylen = min(srclen, destlen);
+			memcpy((void *)dest, (void *)src, copylen);
+
+			total_copied += copylen;
+			bounce_sgl[j].offset += copylen;
+			destlen -= copylen;
+			dest += copylen;
+
+			if (bounce_sgl[j].offset == bounce_sgl[j].length) {
+				/* full */
+				kunmap_atomic((void *)bounce_addr, KM_IRQ0);
+				j++;
+
+				/* if we need to use another bounce buffer */
+				if (destlen || i != orig_sgl_count - 1)
+					bounce_addr =
+					(unsigned long)kmap_atomic(
+					sg_page((&bounce_sgl[j])), KM_IRQ0);
+			} else if (destlen == 0 && i == orig_sgl_count - 1) {
+				/* unmap the last bounce that is < PAGE_SIZE */
+				kunmap_atomic((void *)bounce_addr, KM_IRQ0);
+			}
+		}
+
+		kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset),
+			      KM_IRQ0);
+	}
+
+	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;
+
+	local_irq_save(flags);
+
+	for (i = 0; i < orig_sgl_count; i++) {
+		src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
+				KM_IRQ0) + orig_sgl[i].offset;
+		src = src_addr;
+		srclen = orig_sgl[i].length;
+
+		if (bounce_addr == 0)
+			bounce_addr =
+			(unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
+						KM_IRQ0);
+
+		while (srclen) {
+			/* assume bounce offset always == 0 */
+			dest = bounce_addr + bounce_sgl[j].length;
+			destlen = PAGE_SIZE - bounce_sgl[j].length;
+
+			copylen = min(srclen, destlen);
+			memcpy((void *)dest, (void *)src, copylen);
+
+			total_copied += copylen;
+			bounce_sgl[j].length += copylen;
+			srclen -= copylen;
+			src += copylen;
+
+			if (bounce_sgl[j].length == PAGE_SIZE) {
+				/* full..move to next entry */
+				kunmap_atomic((void *)bounce_addr, KM_IRQ0);
+				j++;
+
+				/* if we need to use another bounce buffer */
+				if (srclen || i != orig_sgl_count - 1)
+					bounce_addr =
+					(unsigned long)kmap_atomic(
+					sg_page((&bounce_sgl[j])), KM_IRQ0);
+
+			} else if (srclen == 0 && i == orig_sgl_count - 1) {
+				/* unmap the last bounce that is < PAGE_SIZE */
+				kunmap_atomic((void *)bounce_addr, KM_IRQ0);
+			}
+		}
+
+		kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0);
+	}
+
+	local_irq_restore(flags);
+
+	return total_copied;
+}
+
+
+static int storvsc_remove(struct hv_device *dev)
+{
+	struct storvsc_device *stor_device = hv_get_drvdata(dev);
+	struct Scsi_Host *host = stor_device->host;
+	struct hv_host_device *host_dev =
+			(struct hv_host_device *)host->hostdata;
+
+	scsi_remove_host(host);
+
+	scsi_host_put(host);
+
+	storvsc_dev_remove(dev);
+	if (host_dev->request_pool) {
+		kmem_cache_destroy(host_dev->request_pool);
+		host_dev->request_pool = NULL;
+	}
+	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(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->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),
+			       (unsigned long)&stor_device->reset_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;
+	}
+
+
+	/*
+	 * At this point, all outstanding requests in the adapter
+	 * should have been flushed out and return to us
+	 */
+
+cleanup:
+	return ret;
+}
+
+
+/*
+ * storvsc_host_reset_handler - Reset the scsi HBA
+ */
+static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
+{
+	int ret;
+	struct hv_host_device *host_dev =
+		(struct hv_host_device *)scmnd->device->host->hostdata;
+	struct hv_device *dev = host_dev->dev;
+
+	ret = storvsc_host_reset(dev);
+	if (ret != 0)
+		return ret;
+
+	return ret;
+}
+
+
+/*
+ * storvsc_command_completion - Command completion processing
+ */
+static void storvsc_command_completion(struct hv_storvsc_request *request)
+{
+	struct storvsc_cmd_request *cmd_request =
+		(struct storvsc_cmd_request *)request->context;
+	struct scsi_cmnd *scmnd = cmd_request->cmd;
+	struct hv_host_device *host_dev =
+		(struct hv_host_device *)scmnd->device->host->hostdata;
+	void (*scsi_done_fn)(struct scsi_cmnd *);
+	struct scsi_sense_hdr sense_hdr;
+	struct vmscsi_request *vm_srb;
+
+	vm_srb = &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));
+			destroy_bounce_buffer(cmd_request->bounce_sgl,
+					cmd_request->bounce_sgl_count);
+		}
+	}
+
+	/*
+	 * If there is an error; offline the device since all
+	 * error recovery strategies would have already been
+	 * deployed on the host side.
+	 */
+	if (vm_srb->srb_status == 0x4)
+		scmnd->result = DID_TARGET_FAILURE << 16;
+	else
+		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("storvsc", &sense_hdr);
+	}
+
+	scsi_set_resid(scmnd,
+		request->data_buffer.len -
+		vm_srb->data_transfer_length);
+
+	scsi_done_fn = scmnd->scsi_done;
+
+	scmnd->host_scribble = NULL;
+	scmnd->scsi_done = NULL;
+
+	scsi_done_fn(scmnd);
+
+	kmem_cache_free(host_dev->request_pool, cmd_request);
+}
+
+static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd)
+{
+	bool allowed = true;
+	u8 scsi_op = scmnd->cmnd[0];
+
+	switch (scsi_op) {
+	/* smartd sends this command, which will offline the device */
+	case SET_WINDOW:
+		scmnd->result = DID_ERROR << 16;
+		allowed = false;
+		break;
+	default:
+		break;
+	}
+	return allowed;
+}
+
+/*
+ * storvsc_queuecommand - Initiate command processing
+ */
+static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
+				void (*done)(struct scsi_cmnd *))
+{
+	int ret;
+	struct hv_host_device *host_dev =
+		(struct hv_host_device *)scmnd->device->host->hostdata;
+	struct hv_device *dev = host_dev->dev;
+	struct hv_storvsc_request *request;
+	struct storvsc_cmd_request *cmd_request;
+	unsigned int request_size = 0;
+	int i;
+	struct scatterlist *sgl;
+	unsigned int sg_count = 0;
+	struct vmscsi_request *vm_srb;
+
+	if (storvsc_check_scsi_cmd(scmnd) == false) {
+		done(scmnd);
+		return 0;
+	}
+
+	/* If retrying, no need to prep the cmd */
+	if (scmnd->host_scribble) {
+
+		cmd_request =
+			(struct storvsc_cmd_request *)scmnd->host_scribble;
+
+		goto retry_request;
+	}
+
+	scmnd->scsi_done = done;
+
+	request_size = sizeof(struct storvsc_cmd_request);
+
+	cmd_request = kmem_cache_zalloc(host_dev->request_pool,
+				       GFP_ATOMIC);
+	if (!cmd_request) {
+		scmnd->scsi_done = NULL;
+		return SCSI_MLQUEUE_DEVICE_BUSY;
+	}
+
+	/* Setup the cmd request */
+	cmd_request->bounce_sgl_count = 0;
+	cmd_request->bounce_sgl = NULL;
+	cmd_request->cmd = scmnd;
+
+	scmnd->host_scribble = (unsigned char *)cmd_request;
+
+	request = &cmd_request->request;
+	vm_srb = &request->vstor_packet.vm_srb;
+
+
+	/* Build the SRB */
+	switch (scmnd->sc_data_direction) {
+	case DMA_TO_DEVICE:
+		vm_srb->data_in = WRITE_TYPE;
+		break;
+	case DMA_FROM_DEVICE:
+		vm_srb->data_in = READ_TYPE;
+		break;
+	default:
+		vm_srb->data_in = UNKNOWN_TYPE;
+		break;
+	}
+
+	request->on_io_completion = storvsc_command_completion;
+	request->context = cmd_request;/* scmnd; */
+
+	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);
+
+	request->sense_buffer = scmnd->sense_buffer;
+
+
+	request->data_buffer.len = scsi_bufflen(scmnd);
+	if (scsi_sg_count(scmnd)) {
+		sgl = (struct scatterlist *)scsi_sglist(scmnd);
+		sg_count = scsi_sg_count(scmnd);
+
+		/* 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, scsi_sg_count(scmnd),
+						     scsi_bufflen(scmnd));
+			if (!cmd_request->bounce_sgl) {
+				scmnd->scsi_done = NULL;
+				scmnd->host_scribble = NULL;
+				kmem_cache_free(host_dev->request_pool,
+						cmd_request);
+
+				return SCSI_MLQUEUE_HOST_BUSY;
+			}
+
+			cmd_request->bounce_sgl_count =
+				ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
+					PAGE_SHIFT;
+
+			if (vm_srb->data_in == WRITE_TYPE)
+				copy_to_bounce_buffer(sgl,
+					cmd_request->bounce_sgl,
+					scsi_sg_count(scmnd));
+
+			sgl = cmd_request->bounce_sgl;
+			sg_count = cmd_request->bounce_sgl_count;
+		}
+
+		request->data_buffer.offset = sgl[0].offset;
+
+		for (i = 0; i < sg_count; i++)
+			request->data_buffer.pfn_array[i] =
+				page_to_pfn(sg_page((&sgl[i])));
+
+	} else if (scsi_sglist(scmnd)) {
+		request->data_buffer.offset =
+			virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
+		request->data_buffer.pfn_array[0] =
+			virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
+	}
+
+retry_request:
+	/* Invokes the vsc to start an IO */
+	ret = storvsc_do_io(dev, &cmd_request->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);
+
+		kmem_cache_free(host_dev->request_pool, cmd_request);
+
+		scmnd->scsi_done = NULL;
+		scmnd->host_scribble = NULL;
+
+		ret = SCSI_MLQUEUE_DEVICE_BUSY;
+	}
+
+	return ret;
+}
+
+static DEF_SCSI_QCMD(storvsc_queuecommand)
+
+
+/* Scsi driver */
+static struct scsi_host_template scsi_driver = {
+	.module	=		THIS_MODULE,
+	.name =			"storvsc_host_t",
+	.bios_param =		storvsc_get_chs,
+	.queuecommand =		storvsc_queuecommand,
+	.eh_host_reset_handler =	storvsc_host_reset_handler,
+	.slave_alloc =		storvsc_device_alloc,
+	.slave_configure =	storvsc_device_configure,
+	.cmd_per_lun =		1,
+	/* 64 max_queue * 1 target */
+	.can_queue =		STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
+	.this_id =		-1,
+	/* no use setting to 0 since ll_blk_rw reset it to 1 */
+	/* currently 32 */
+	.sg_tablesize =		MAX_MULTIPAGE_BUFFER_COUNT,
+	/*
+	 * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge
+	 * into 1 sg element. If set, we must limit the max_segment_size to
+	 * PAGE_SIZE, otherwise we may get 1 sg element that represents
+	 * multiple
+	 */
+	/* physically contig pfns (ie sg[x].length > PAGE_SIZE). */
+	.use_clustering =	ENABLE_CLUSTERING,
+	/* Make sure we dont get a sg segment crosses a page boundary */
+	.dma_boundary =		PAGE_SIZE-1,
+};
+
+enum {
+	SCSI_GUID,
+	IDE_GUID,
+};
+
+static const struct hv_vmbus_device_id id_table[] = {
+	/* SCSI guid */
+	{ VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
+		       0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
+	  .driver_data = SCSI_GUID },
+	/* IDE guid */
+	{ VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
+		       0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
+	  .driver_data = IDE_GUID },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(vmbus, id_table);
+
+
+/*
+ * storvsc_probe - Add a new device for this driver
+ */
+
+static int storvsc_probe(struct hv_device *device,
+			const struct hv_vmbus_device_id *dev_id)
+{
+	int ret;
+	struct Scsi_Host *host;
+	struct hv_host_device *host_dev;
+	bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
+	int path = 0;
+	int target = 0;
+	struct storvsc_device *stor_device;
+
+	host = scsi_host_alloc(&scsi_driver,
+			       sizeof(struct hv_host_device));
+	if (!host)
+		return -ENOMEM;
+
+	host_dev = (struct hv_host_device *)host->hostdata;
+	memset(host_dev, 0, sizeof(struct hv_host_device));
+
+	host_dev->port = host->host_no;
+	host_dev->dev = device;
+
+	host_dev->request_pool =
+				kmem_cache_create(dev_name(&device->device),
+					sizeof(struct storvsc_cmd_request), 0,
+					SLAB_HWCACHE_ALIGN, NULL);
+
+	if (!host_dev->request_pool) {
+		scsi_host_put(host);
+		return -ENOMEM;
+	}
+
+	stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
+	if (!stor_device) {
+		kmem_cache_destroy(host_dev->request_pool);
+		scsi_host_put(host);
+		return -ENOMEM;
+	}
+
+	stor_device->destroy = 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) {
+		kmem_cache_destroy(host_dev->request_pool);
+		scsi_host_put(host);
+		kfree(stor_device);
+		return ret;
+	}
+
+	if (dev_is_ide)
+		storvsc_get_ide_info(device, &target, &path);
+
+	host_dev->path = stor_device->path_id;
+	host_dev->target = stor_device->target_id;
+
+	/* max # of devices per target */
+	host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
+	/* max # of targets per channel */
+	host->max_id = STORVSC_MAX_TARGETS;
+	/* max # of channels */
+	host->max_channel = STORVSC_MAX_CHANNELS - 1;
+	/* max cmd length */
+	host->max_cmd_len = STORVSC_MAX_CMD_LEN;
+
+	/* Register the HBA and start the scsi bus scan */
+	ret = scsi_add_host(host, &device->device);
+	if (ret != 0)
+		goto err_out;
+
+	if (!dev_is_ide) {
+		scsi_scan_host(host);
+		return 0;
+	}
+	ret = scsi_add_device(host, 0, target, 0);
+	if (ret) {
+		scsi_remove_host(host);
+		goto err_out;
+	}
+	return 0;
+
+err_out:
+	storvsc_dev_remove(device);
+	kmem_cache_destroy(host_dev->request_pool);
+	scsi_host_put(host);
+	return -ENODEV;
+}
+
+/* The one and only one */
+
+static struct hv_driver storvsc_drv = {
+	.name = "storvsc",
+	.id_table = id_table,
+	.probe = storvsc_probe,
+	.remove = storvsc_remove,
+};
+
+static int __init storvsc_drv_init(void)
+{
+	u32 max_outstanding_req_per_channel;
+
+	/*
+	 * 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),
+		sizeof(u64)));
+
+	if (max_outstanding_req_per_channel <
+	    STORVSC_MAX_IO_REQUESTS)
+		return -EINVAL;
+
+	return vmbus_driver_register(&storvsc_drv);
+}
+
+static void __exit storvsc_drv_exit(void)
+{
+	vmbus_driver_unregister(&storvsc_drv);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(HV_DRV_VERSION);
+MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
+module_init(storvsc_drv_init);
+module_exit(storvsc_drv_exit);
diff --git a/drivers/staging/hv/Kconfig b/drivers/staging/hv/Kconfig
index 6c0dc30..3c98a2a 100644
--- a/drivers/staging/hv/Kconfig
+++ b/drivers/staging/hv/Kconfig
@@ -1,9 +1,3 @@
-config HYPERV_STORAGE
-	tristate "Microsoft Hyper-V virtual storage driver"
-	depends on HYPERV && SCSI
-	help
-	 Select this option to enable the Hyper-V virtual storage driver.
-
 config HYPERV_NET
 	tristate "Microsoft Hyper-V virtual network driver"
 	depends on HYPERV && NET
diff --git a/drivers/staging/hv/Makefile b/drivers/staging/hv/Makefile
index 3a2751e..91e4a11 100644
--- a/drivers/staging/hv/Makefile
+++ b/drivers/staging/hv/Makefile
@@ -1,6 +1,4 @@
 obj-$(CONFIG_HYPERV)		+= hv_timesource.o
-obj-$(CONFIG_HYPERV_STORAGE)	+= hv_storvsc.o
 obj-$(CONFIG_HYPERV_NET)	+= hv_netvsc.o
 
-hv_storvsc-y := storvsc_drv.o
 hv_netvsc-y := netvsc_drv.o netvsc.o rndis_filter.o
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
deleted file mode 100644
index ae8c33e..0000000
--- a/drivers/staging/hv/storvsc_drv.c
+++ /dev/null
@@ -1,1480 +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@xxxxxxxxxxxxx>
- *   Hank Janssen  <hjanssen@xxxxxxxxxxxxx>
- *   K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
- */
-
-#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 <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>
-
-
-#define STORVSC_RING_BUFFER_SIZE			(20*PAGE_SIZE)
-static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;
-
-module_param(storvsc_ringbuffer_size, int, S_IRUGO);
-MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
-
-/* to alert the user that structure sizes may be mismatched even though the */
-/* protocol versions match. */
-
-
-#define REVISION_STRING(REVISION_) #REVISION_
-#define FILL_VMSTOR_REVISION(RESULT_LVALUE_)				\
-	do {								\
-		char *revision_string					\
-			= REVISION_STRING($Rev : 6 $) + 6;		\
-		RESULT_LVALUE_ = 0;					\
-		while (*revision_string >= '0'				\
-			&& *revision_string <= '9') {			\
-			RESULT_LVALUE_ *= 10;				\
-			RESULT_LVALUE_ += *revision_string - '0';	\
-			revision_string++;				\
-		}							\
-	} while (0)
-
-/* 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). */
-#define VMSTOR_PROTOCOL_MAJOR(VERSION_)		(((VERSION_) >> 8) & 0xff)
-#define VMSTOR_PROTOCOL_MINOR(VERSION_)		(((VERSION_))      & 0xff)
-#define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_)	((((MAJOR_) & 0xff) << 8) | \
-						 (((MINOR_) & 0xff)))
-#define VMSTOR_INVALID_PROTOCOL_VERSION		(-1)
-
-/* Version history: */
-/* V1 Beta                    0.1 */
-/* V1 RC < 2008/1/31          1.0 */
-/* V1 RC > 2008/1/31          2.0 */
-#define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(2, 0)
-
-
-
-
-/*  This will get replaced with the max transfer length that is possible on */
-/*  the host adapter. */
-/*  The max transfer length will be published when we offer a vmbus channel. */
-#define MAX_TRANSFER_LENGTH	0x40000
-#define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) +	\
-			sizeof(struct vstor_packet) +		\
-			sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE)))
-
-
-/*  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_MAXIMUM			= 10
-};
-
-/*
- * 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 CDB16GENERIC_LENGTH			0x10
-
-#ifndef SENSE_BUFFER_SIZE
-#define SENSE_BUFFER_SIZE			0x12
-#endif
-
-#define MAX_DATA_BUF_LEN_WITH_PADDING		0x14
-
-struct vmscsi_request {
-	unsigned short length;
-	unsigned char srb_status;
-	unsigned char scsi_status;
-
-	unsigned char port_number;
-	unsigned char path_id;
-	unsigned char target_id;
-	unsigned char lun;
-
-	unsigned char cdb_length;
-	unsigned char sense_info_length;
-	unsigned char data_in;
-	unsigned char reserved;
-
-	unsigned int data_transfer_length;
-
-	union {
-		unsigned char cdb[CDB16GENERIC_LENGTH];
-		unsigned char sense_data[SENSE_BUFFER_SIZE];
-		unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING];
-	};
-} __attribute((packed));
-
-
-/*
- * This structure is sent during the intialization phase to get the different
- * properties of the channel.
- */
-struct vmstorage_channel_properties {
-	unsigned short protocol_version;
-	unsigned char path_id;
-	unsigned char target_id;
-
-	/* Note: port number is only really known on the client side */
-	unsigned int port_number;
-	unsigned int flags;
-	unsigned int max_transfer_bytes;
-
-	/*  This id is unique for each channel and will correspond with */
-	/*  vendor specific data in the inquirydata */
-	unsigned long long unique_id;
-} __packed;
-
-/*  This structure is sent during the storage protocol negotiations. */
-struct vmstorage_protocol_version {
-	/* Major (MSW) and minor (LSW) version numbers. */
-	unsigned short 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.
-	 */
-	unsigned short 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 */
-	unsigned int flags;
-
-	/* Status of the request returned from the server side. */
-	unsigned int 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;
-	};
-} __packed;
-
-/* Packet flags */
-/*
- * This flag indicates that the server should send back a completion for this
- * packet.
- */
-#define REQUEST_COMPLETION_FLAG	0x1
-
-/*  This is the set of flags that the vsc can set in any packets it sends */
-#define VSC_LEGAL_FLAGS		(REQUEST_COMPLETION_FLAG)
-
-
-/* Defines */
-
-#define STORVSC_MAX_IO_REQUESTS				128
-
-/*
- * In Hyper-V, each port/path/target maps to 1 scsi host adapter.  In
- * reality, the path/target is not used (ie always set to 0) so our
- * scsi host adapter essentially has 1 bus with 1 target that contains
- * up to 256 luns.
- */
-#define STORVSC_MAX_LUNS_PER_TARGET			64
-#define STORVSC_MAX_TARGETS				1
-#define STORVSC_MAX_CHANNELS				1
-#define STORVSC_MAX_CMD_LEN				16
-
-struct hv_storvsc_request;
-
-/* Matches Windows-end */
-enum storvsc_request_type {
-	WRITE_TYPE,
-	READ_TYPE,
-	UNKNOWN_TYPE,
-};
-
-
-struct hv_storvsc_request {
-	struct hv_device *device;
-
-	/* Synchronize the request/response if needed */
-	struct completion wait_event;
-
-	unsigned char *sense_buffer;
-	void *context;
-	void (*on_io_completion)(struct hv_storvsc_request *request);
-	struct hv_multipage_buffer data_buffer;
-
-	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;
-	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;
-
-	/* Used for vsc/vsp channel reset process */
-	struct hv_storvsc_request init_request;
-	struct hv_storvsc_request reset_request;
-};
-
-struct hv_host_device {
-	struct hv_device *dev;
-	struct kmem_cache *request_pool;
-	unsigned int port;
-	unsigned char path;
-	unsigned char target;
-};
-
-struct storvsc_cmd_request {
-	struct list_head entry;
-	struct scsi_cmnd *cmd;
-
-	unsigned int bounce_sgl_count;
-	struct scatterlist *bounce_sgl;
-
-	struct hv_storvsc_request request;
-};
-
-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 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 = 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 = 0x1;
-	}
-
-
-	/* 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){
-		dev_warn(&device->device,
-			 "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 */
-			dev_warn(&device->device,
-				 "stor 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;
-}
-
-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 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;
-}
-
-static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path)
-{
-	*target =
-		dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4];
-
-	*path =
-		dev->dev_instance.b[3] << 24 |
-		dev->dev_instance.b[2] << 16 |
-		dev->dev_instance.b[1] << 8  | dev->dev_instance.b[0];
-}
-
-
-static int storvsc_device_alloc(struct scsi_device *sdevice)
-{
-	/*
-	 * This enables luns to be located sparsely. Otherwise, we may not
-	 * discovered them.
-	 */
-	sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN;
-	return 0;
-}
-
-static int storvsc_merge_bvec(struct request_queue *q,
-			      struct bvec_merge_data *bmd, struct bio_vec *bvec)
-{
-	/* checking done by caller. */
-	return bvec->bv_len;
-}
-
-static int storvsc_device_configure(struct scsi_device *sdevice)
-{
-	scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
-				STORVSC_MAX_IO_REQUESTS);
-
-	blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
-
-	blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec);
-
-	blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
-
-	return 0;
-}
-
-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 i;
-	int num_pages;
-	struct scatterlist *bounce_sgl;
-	struct page *page_buf;
-
-	num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
-
-	bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
-	if (!bounce_sgl)
-		return NULL;
-
-	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, 0, 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)
-{
-	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;
-
-	local_irq_save(flags);
-
-	for (i = 0; i < orig_sgl_count; i++) {
-		dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
-					KM_IRQ0) + orig_sgl[i].offset;
-		dest = dest_addr;
-		destlen = orig_sgl[i].length;
-
-		if (bounce_addr == 0)
-			bounce_addr =
-			(unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
-							KM_IRQ0);
-
-		while (destlen) {
-			src = bounce_addr + bounce_sgl[j].offset;
-			srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
-
-			copylen = min(srclen, destlen);
-			memcpy((void *)dest, (void *)src, copylen);
-
-			total_copied += copylen;
-			bounce_sgl[j].offset += copylen;
-			destlen -= copylen;
-			dest += copylen;
-
-			if (bounce_sgl[j].offset == bounce_sgl[j].length) {
-				/* full */
-				kunmap_atomic((void *)bounce_addr, KM_IRQ0);
-				j++;
-
-				/* if we need to use another bounce buffer */
-				if (destlen || i != orig_sgl_count - 1)
-					bounce_addr =
-					(unsigned long)kmap_atomic(
-					sg_page((&bounce_sgl[j])), KM_IRQ0);
-			} else if (destlen == 0 && i == orig_sgl_count - 1) {
-				/* unmap the last bounce that is < PAGE_SIZE */
-				kunmap_atomic((void *)bounce_addr, KM_IRQ0);
-			}
-		}
-
-		kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset),
-			      KM_IRQ0);
-	}
-
-	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;
-
-	local_irq_save(flags);
-
-	for (i = 0; i < orig_sgl_count; i++) {
-		src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
-				KM_IRQ0) + orig_sgl[i].offset;
-		src = src_addr;
-		srclen = orig_sgl[i].length;
-
-		if (bounce_addr == 0)
-			bounce_addr =
-			(unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
-						KM_IRQ0);
-
-		while (srclen) {
-			/* assume bounce offset always == 0 */
-			dest = bounce_addr + bounce_sgl[j].length;
-			destlen = PAGE_SIZE - bounce_sgl[j].length;
-
-			copylen = min(srclen, destlen);
-			memcpy((void *)dest, (void *)src, copylen);
-
-			total_copied += copylen;
-			bounce_sgl[j].length += copylen;
-			srclen -= copylen;
-			src += copylen;
-
-			if (bounce_sgl[j].length == PAGE_SIZE) {
-				/* full..move to next entry */
-				kunmap_atomic((void *)bounce_addr, KM_IRQ0);
-				j++;
-
-				/* if we need to use another bounce buffer */
-				if (srclen || i != orig_sgl_count - 1)
-					bounce_addr =
-					(unsigned long)kmap_atomic(
-					sg_page((&bounce_sgl[j])), KM_IRQ0);
-
-			} else if (srclen == 0 && i == orig_sgl_count - 1) {
-				/* unmap the last bounce that is < PAGE_SIZE */
-				kunmap_atomic((void *)bounce_addr, KM_IRQ0);
-			}
-		}
-
-		kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0);
-	}
-
-	local_irq_restore(flags);
-
-	return total_copied;
-}
-
-
-static int storvsc_remove(struct hv_device *dev)
-{
-	struct storvsc_device *stor_device = hv_get_drvdata(dev);
-	struct Scsi_Host *host = stor_device->host;
-	struct hv_host_device *host_dev =
-			(struct hv_host_device *)host->hostdata;
-
-	scsi_remove_host(host);
-
-	scsi_host_put(host);
-
-	storvsc_dev_remove(dev);
-	if (host_dev->request_pool) {
-		kmem_cache_destroy(host_dev->request_pool);
-		host_dev->request_pool = NULL;
-	}
-	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(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->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),
-			       (unsigned long)&stor_device->reset_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;
-	}
-
-
-	/*
-	 * At this point, all outstanding requests in the adapter
-	 * should have been flushed out and return to us
-	 */
-
-cleanup:
-	return ret;
-}
-
-
-/*
- * storvsc_host_reset_handler - Reset the scsi HBA
- */
-static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
-{
-	int ret;
-	struct hv_host_device *host_dev =
-		(struct hv_host_device *)scmnd->device->host->hostdata;
-	struct hv_device *dev = host_dev->dev;
-
-	ret = storvsc_host_reset(dev);
-	if (ret != 0)
-		return ret;
-
-	return ret;
-}
-
-
-/*
- * storvsc_command_completion - Command completion processing
- */
-static void storvsc_command_completion(struct hv_storvsc_request *request)
-{
-	struct storvsc_cmd_request *cmd_request =
-		(struct storvsc_cmd_request *)request->context;
-	struct scsi_cmnd *scmnd = cmd_request->cmd;
-	struct hv_host_device *host_dev =
-		(struct hv_host_device *)scmnd->device->host->hostdata;
-	void (*scsi_done_fn)(struct scsi_cmnd *);
-	struct scsi_sense_hdr sense_hdr;
-	struct vmscsi_request *vm_srb;
-
-	vm_srb = &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));
-			destroy_bounce_buffer(cmd_request->bounce_sgl,
-					cmd_request->bounce_sgl_count);
-		}
-	}
-
-	/*
-	 * If there is an error; offline the device since all
-	 * error recovery strategies would have already been
-	 * deployed on the host side.
-	 */
-	if (vm_srb->srb_status == 0x4)
-		scmnd->result = DID_TARGET_FAILURE << 16;
-	else
-		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("storvsc", &sense_hdr);
-	}
-
-	scsi_set_resid(scmnd,
-		request->data_buffer.len -
-		vm_srb->data_transfer_length);
-
-	scsi_done_fn = scmnd->scsi_done;
-
-	scmnd->host_scribble = NULL;
-	scmnd->scsi_done = NULL;
-
-	scsi_done_fn(scmnd);
-
-	kmem_cache_free(host_dev->request_pool, cmd_request);
-}
-
-static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd)
-{
-	bool allowed = true;
-	u8 scsi_op = scmnd->cmnd[0];
-
-	switch (scsi_op) {
-	/* smartd sends this command, which will offline the device */
-	case SET_WINDOW:
-		scmnd->result = DID_ERROR << 16;
-		allowed = false;
-		break;
-	default:
-		break;
-	}
-	return allowed;
-}
-
-/*
- * storvsc_queuecommand - Initiate command processing
- */
-static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
-				void (*done)(struct scsi_cmnd *))
-{
-	int ret;
-	struct hv_host_device *host_dev =
-		(struct hv_host_device *)scmnd->device->host->hostdata;
-	struct hv_device *dev = host_dev->dev;
-	struct hv_storvsc_request *request;
-	struct storvsc_cmd_request *cmd_request;
-	unsigned int request_size = 0;
-	int i;
-	struct scatterlist *sgl;
-	unsigned int sg_count = 0;
-	struct vmscsi_request *vm_srb;
-
-	if (storvsc_check_scsi_cmd(scmnd) == false) {
-		done(scmnd);
-		return 0;
-	}
-
-	/* If retrying, no need to prep the cmd */
-	if (scmnd->host_scribble) {
-
-		cmd_request =
-			(struct storvsc_cmd_request *)scmnd->host_scribble;
-
-		goto retry_request;
-	}
-
-	scmnd->scsi_done = done;
-
-	request_size = sizeof(struct storvsc_cmd_request);
-
-	cmd_request = kmem_cache_zalloc(host_dev->request_pool,
-				       GFP_ATOMIC);
-	if (!cmd_request) {
-		scmnd->scsi_done = NULL;
-		return SCSI_MLQUEUE_DEVICE_BUSY;
-	}
-
-	/* Setup the cmd request */
-	cmd_request->bounce_sgl_count = 0;
-	cmd_request->bounce_sgl = NULL;
-	cmd_request->cmd = scmnd;
-
-	scmnd->host_scribble = (unsigned char *)cmd_request;
-
-	request = &cmd_request->request;
-	vm_srb = &request->vstor_packet.vm_srb;
-
-
-	/* Build the SRB */
-	switch (scmnd->sc_data_direction) {
-	case DMA_TO_DEVICE:
-		vm_srb->data_in = WRITE_TYPE;
-		break;
-	case DMA_FROM_DEVICE:
-		vm_srb->data_in = READ_TYPE;
-		break;
-	default:
-		vm_srb->data_in = UNKNOWN_TYPE;
-		break;
-	}
-
-	request->on_io_completion = storvsc_command_completion;
-	request->context = cmd_request;/* scmnd; */
-
-	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);
-
-	request->sense_buffer = scmnd->sense_buffer;
-
-
-	request->data_buffer.len = scsi_bufflen(scmnd);
-	if (scsi_sg_count(scmnd)) {
-		sgl = (struct scatterlist *)scsi_sglist(scmnd);
-		sg_count = scsi_sg_count(scmnd);
-
-		/* 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, scsi_sg_count(scmnd),
-						     scsi_bufflen(scmnd));
-			if (!cmd_request->bounce_sgl) {
-				scmnd->scsi_done = NULL;
-				scmnd->host_scribble = NULL;
-				kmem_cache_free(host_dev->request_pool,
-						cmd_request);
-
-				return SCSI_MLQUEUE_HOST_BUSY;
-			}
-
-			cmd_request->bounce_sgl_count =
-				ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
-					PAGE_SHIFT;
-
-			if (vm_srb->data_in == WRITE_TYPE)
-				copy_to_bounce_buffer(sgl,
-					cmd_request->bounce_sgl,
-					scsi_sg_count(scmnd));
-
-			sgl = cmd_request->bounce_sgl;
-			sg_count = cmd_request->bounce_sgl_count;
-		}
-
-		request->data_buffer.offset = sgl[0].offset;
-
-		for (i = 0; i < sg_count; i++)
-			request->data_buffer.pfn_array[i] =
-				page_to_pfn(sg_page((&sgl[i])));
-
-	} else if (scsi_sglist(scmnd)) {
-		request->data_buffer.offset =
-			virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
-		request->data_buffer.pfn_array[0] =
-			virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
-	}
-
-retry_request:
-	/* Invokes the vsc to start an IO */
-	ret = storvsc_do_io(dev, &cmd_request->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);
-
-		kmem_cache_free(host_dev->request_pool, cmd_request);
-
-		scmnd->scsi_done = NULL;
-		scmnd->host_scribble = NULL;
-
-		ret = SCSI_MLQUEUE_DEVICE_BUSY;
-	}
-
-	return ret;
-}
-
-static DEF_SCSI_QCMD(storvsc_queuecommand)
-
-
-/* Scsi driver */
-static struct scsi_host_template scsi_driver = {
-	.module	=		THIS_MODULE,
-	.name =			"storvsc_host_t",
-	.bios_param =		storvsc_get_chs,
-	.queuecommand =		storvsc_queuecommand,
-	.eh_host_reset_handler =	storvsc_host_reset_handler,
-	.slave_alloc =		storvsc_device_alloc,
-	.slave_configure =	storvsc_device_configure,
-	.cmd_per_lun =		1,
-	/* 64 max_queue * 1 target */
-	.can_queue =		STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
-	.this_id =		-1,
-	/* no use setting to 0 since ll_blk_rw reset it to 1 */
-	/* currently 32 */
-	.sg_tablesize =		MAX_MULTIPAGE_BUFFER_COUNT,
-	/*
-	 * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge
-	 * into 1 sg element. If set, we must limit the max_segment_size to
-	 * PAGE_SIZE, otherwise we may get 1 sg element that represents
-	 * multiple
-	 */
-	/* physically contig pfns (ie sg[x].length > PAGE_SIZE). */
-	.use_clustering =	ENABLE_CLUSTERING,
-	/* Make sure we dont get a sg segment crosses a page boundary */
-	.dma_boundary =		PAGE_SIZE-1,
-};
-
-enum {
-	SCSI_GUID,
-	IDE_GUID,
-};
-
-static const struct hv_vmbus_device_id id_table[] = {
-	/* SCSI guid */
-	{ VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
-		       0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
-	  .driver_data = SCSI_GUID },
-	/* IDE guid */
-	{ VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
-		       0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
-	  .driver_data = IDE_GUID },
-	{ },
-};
-
-MODULE_DEVICE_TABLE(vmbus, id_table);
-
-
-/*
- * storvsc_probe - Add a new device for this driver
- */
-
-static int storvsc_probe(struct hv_device *device,
-			const struct hv_vmbus_device_id *dev_id)
-{
-	int ret;
-	struct Scsi_Host *host;
-	struct hv_host_device *host_dev;
-	bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
-	int path = 0;
-	int target = 0;
-	struct storvsc_device *stor_device;
-
-	host = scsi_host_alloc(&scsi_driver,
-			       sizeof(struct hv_host_device));
-	if (!host)
-		return -ENOMEM;
-
-	host_dev = (struct hv_host_device *)host->hostdata;
-	memset(host_dev, 0, sizeof(struct hv_host_device));
-
-	host_dev->port = host->host_no;
-	host_dev->dev = device;
-
-	host_dev->request_pool =
-				kmem_cache_create(dev_name(&device->device),
-					sizeof(struct storvsc_cmd_request), 0,
-					SLAB_HWCACHE_ALIGN, NULL);
-
-	if (!host_dev->request_pool) {
-		scsi_host_put(host);
-		return -ENOMEM;
-	}
-
-	stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
-	if (!stor_device) {
-		kmem_cache_destroy(host_dev->request_pool);
-		scsi_host_put(host);
-		return -ENOMEM;
-	}
-
-	stor_device->destroy = 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) {
-		kmem_cache_destroy(host_dev->request_pool);
-		scsi_host_put(host);
-		kfree(stor_device);
-		return ret;
-	}
-
-	if (dev_is_ide)
-		storvsc_get_ide_info(device, &target, &path);
-
-	host_dev->path = stor_device->path_id;
-	host_dev->target = stor_device->target_id;
-
-	/* max # of devices per target */
-	host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
-	/* max # of targets per channel */
-	host->max_id = STORVSC_MAX_TARGETS;
-	/* max # of channels */
-	host->max_channel = STORVSC_MAX_CHANNELS - 1;
-	/* max cmd length */
-	host->max_cmd_len = STORVSC_MAX_CMD_LEN;
-
-	/* Register the HBA and start the scsi bus scan */
-	ret = scsi_add_host(host, &device->device);
-	if (ret != 0)
-		goto err_out;
-
-	if (!dev_is_ide) {
-		scsi_scan_host(host);
-		return 0;
-	}
-	ret = scsi_add_device(host, 0, target, 0);
-	if (ret) {
-		scsi_remove_host(host);
-		goto err_out;
-	}
-	return 0;
-
-err_out:
-	storvsc_dev_remove(device);
-	kmem_cache_destroy(host_dev->request_pool);
-	scsi_host_put(host);
-	return -ENODEV;
-}
-
-/* The one and only one */
-
-static struct hv_driver storvsc_drv = {
-	.name = "storvsc",
-	.id_table = id_table,
-	.probe = storvsc_probe,
-	.remove = storvsc_remove,
-};
-
-static int __init storvsc_drv_init(void)
-{
-	u32 max_outstanding_req_per_channel;
-
-	/*
-	 * 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),
-		sizeof(u64)));
-
-	if (max_outstanding_req_per_channel <
-	    STORVSC_MAX_IO_REQUESTS)
-		return -EINVAL;
-
-	return vmbus_driver_register(&storvsc_drv);
-}
-
-static void __exit storvsc_drv_exit(void)
-{
-	vmbus_driver_unregister(&storvsc_drv);
-}
-
-MODULE_LICENSE("GPL");
-MODULE_VERSION(HV_DRV_VERSION);
-MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
-module_init(storvsc_drv_init);
-module_exit(storvsc_drv_exit);
-- 
1.7.4.1

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