- 根目录:
- drivers
- staging
- hv
- storvsc.c
/*
* 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>
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include "hv_api.h"
#include "logging.h"
#include "storvsc_api.h"
#include "vmbus_packet_format.h"
#include "vstorage.h"
#include "channel.h"
struct storvsc_request_extension {
/* LIST_ENTRY ListEntry; */
struct hv_storvsc_request *request;
struct hv_device *device;
/* Synchronize the request/response if needed */
int wait_condition;
wait_queue_head_t wait_event;
struct vstor_packet vstor_packet;
};
/* A storvsc device is a device object that contains a vmbus channel */
struct storvsc_device {
struct hv_device *device;
/* 0 indicates the device is being destroyed */
atomic_t ref_count;
atomic_t num_outstanding_req;
/*
* 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;
/* LIST_ENTRY OutstandingRequestList; */
/* HANDLE OutstandingRequestLock; */
/* Used for vsc/vsp channel reset process */
struct storvsc_request_extension init_request;
struct storvsc_request_extension reset_request;
};
static const char *g_driver_name = "storvsc";
/* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
static const struct hv_guid gStorVscDeviceType = {
.data = {
0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
}
};
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;
/* Set to 2 to allow both inbound and outbound traffics */
/* (ie get_stor_device() and must_get_stor_device()) to proceed. */
atomic_cmpxchg(&stor_device->ref_count, 0, 2);
stor_device->device = device;
device->ext = stor_device;
return stor_device;
}
static inline void free_stor_device(struct storvsc_device *device)
{
/* ASSERT(atomic_read(&device->ref_count) == 0); */
kfree(device);
}
/* Get the stordevice object iff exists and its refcount > 1 */
static inline struct storvsc_device *get_stor_device(struct hv_device *device)
{
struct storvsc_device *stor_device;
stor_device = (struct storvsc_device *)device->ext;
if (stor_device && atomic_read(&stor_device->ref_count) > 1)
atomic_inc(&stor_device->ref_count);
else
stor_device = NULL;
return stor_device;
}
/* Get the stordevice object iff exists and its refcount > 0 */
static inline struct storvsc_device *must_get_stor_device(
struct hv_device *device)
{
struct storvsc_device *stor_device;
stor_device = (struct storvsc_device *)device->ext;
if (stor_device && atomic_read(&stor_device->ref_count))
atomic_inc(&stor_device->ref_count);
else
stor_device = NULL;
return stor_device;
}
static inline void put_stor_device(struct hv_device *device)
{
struct storvsc_device *stor_device;
stor_device = (struct storvsc_device *)device->ext;
/* ASSERT(stor_device); */
atomic_dec(&stor_device->ref_count);
/* ASSERT(atomic_read(&stor_device->ref_count)); */
}
/* Drop ref count to 1 to effectively disable get_stor_device() */
static inline struct storvsc_device *release_stor_device(
struct hv_device *device)
{
struct storvsc_device *stor_device;
stor_device = (struct storvsc_device *)device->ext;
/* ASSERT(stor_device); */
/* Busy wait until the ref drop to 2, then set it to 1 */
while (atomic_cmpxchg(&stor_device->ref_count, 2, 1) != 2)
udelay(100);
return stor_device;
}
/* Drop ref count to 0. No one can use stor_device object. */
static inline struct storvsc_device *final_release_stor_device(
struct hv_device *device)
{
struct storvsc_device *stor_device;
stor_device = (struct storvsc_device *)device->ext;
/* ASSERT(stor_device); */
/* Busy wait until the ref drop to 1, then set it to 0 */
while (atomic_cmpxchg(&stor_device->ref_count, 1, 0) != 1)
udelay(100);
device->ext = NULL;
return stor_device;
}
static int stor_vsc_channel_init(struct hv_device *device)
{
struct storvsc_device *stor_device;
struct storvsc_request_extension *request;
struct vstor_packet *vstor_packet;
int ret;
stor_device = get_stor_device(device);
if (!stor_device) {
DPRINT_ERR(STORVSC, "unable to get stor device..."
"device being destroyed?");
return -1;
}
request = &stor_device->init_request;
vstor_packet = &request->vstor_packet;
/*
* Now, initiate the vsc/vsp initialization protocol on the open
* channel
*/
memset(request, 0, sizeof(struct storvsc_request_extension));
init_waitqueue_head(&request->wait_event);
vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
vstor_packet->flags = REQUEST_COMPLETION_FLAG;
DPRINT_INFO(STORVSC, "BEGIN_INITIALIZATION_OPERATION...");
request->wait_condition = 0;
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) {
DPRINT_ERR(STORVSC,
"unable to send BEGIN_INITIALIZATION_OPERATION");
goto cleanup;
}
wait_event_timeout(request->wait_event, request->wait_condition,
msecs_to_jiffies(1000));
if (request->wait_condition == 0) {
ret = -ETIMEDOUT;
goto cleanup;
}
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
vstor_packet->status != 0) {
DPRINT_ERR(STORVSC, "BEGIN_INITIALIZATION_OPERATION failed "
"(op %d status 0x%x)",
vstor_packet->operation, vstor_packet->status);
goto cleanup;
}
DPRINT_INFO(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION...");
/* 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);
request->wait_condition = 0;
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) {
DPRINT_ERR(STORVSC,
"unable to send BEGIN_INITIALIZATION_OPERATION");
goto cleanup;
}
wait_event_timeout(request->wait_event, request->wait_condition,
msecs_to_jiffies(1000));
if (request->wait_condition == 0) {
ret = -ETIMEDOUT;
goto cleanup;
}
/* TODO: Check returned version */
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
vstor_packet->status != 0) {
DPRINT_ERR(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION failed "
"(op %d status 0x%x)",
vstor_packet->operation, vstor_packet->status);
goto cleanup;
}
/* Query channel properties */
DPRINT_INFO(STORVSC, "QUERY_PROPERTIES_OPERATION...");
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;
request->wait_condition = 0;
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) {
DPRINT_ERR(STORVSC,
"unable to send QUERY_PROPERTIES_OPERATION");
goto cleanup;
}
wait_event_timeout(request->wait_event, request->wait_condition,
msecs_to_jiffies(1000));
if (request->wait_condition == 0) {
ret = -ETIMEDOUT;
goto cleanup;
}
/* TODO: Check returned version */
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
vstor_packet->status != 0) {
DPRINT_ERR(STORVSC, "QUERY_PROPERTIES_OPERATION failed "
"(op %d status 0x%x)",
vstor_packet->operation, vstor_packet->status);
goto cleanup;
}
stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
stor_device->target_id
= vstor_packet->storage_channel_properties.target_id;
DPRINT_DBG(STORVSC, "channel flag 0x%x, max xfer len 0x%x",
vstor_packet->storage_channel_properties.flags,
vstor_packet->storage_channel_properties.max_transfer_bytes);
DPRINT_INFO(STORVSC, "END_INITIALIZATION_OPERATION...");
memset(vstor_packet, 0, sizeof(struct vstor_packet));
vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
vstor_packet->flags = REQUEST_COMPLETION_FLAG;
request->wait_condition = 0;
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) {
DPRINT_ERR(STORVSC,
"unable to send END_INITIALIZATION_OPERATION");
goto cleanup;
}
wait_event_timeout(request->wait_event, request->wait_condition,
msecs_to_jiffies(1000));
if (request->wait_condition == 0) {
ret = -ETIMEDOUT;
goto cleanup;
}
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
vstor_packet->status != 0) {
DPRINT_ERR(STORVSC, "END_INITIALIZATION_OPERATION failed "
"(op %d status 0x%x)",
vstor_packet->operation, vstor_packet->status);
goto cleanup;
}
DPRINT_INFO(STORVSC, "**** storage channel up and running!! ****");
cleanup:
put_stor_device(device);
return ret;
}
static void stor_vsc_on_io_completion(struct hv_device *device,
struct vstor_packet *vstor_packet,
struct storvsc_request_extension *request_ext)
{
struct hv_storvsc_request *request;
struct storvsc_device *stor_device;
stor_device = must_get_stor_device(device);
if (!stor_device) {
DPRINT_ERR(STORVSC, "unable to get stor device..."
"device being destroyed?");
return;
}
DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION - request extension %p "
"completed bytes xfer %u", request_ext,
vstor_packet->vm_srb.data_transfer_length);
/* ASSERT(request_ext != NULL); */
/* ASSERT(request_ext->request != NULL); */
request = request_ext->request;
/* ASSERT(request->OnIOCompletion != NULL); */
/* Copy over the status...etc */
request->status = vstor_packet->vm_srb.scsi_status;
if (request->status != 0 || vstor_packet->vm_srb.srb_status != 1) {
DPRINT_WARN(STORVSC,
"cmd 0x%x scsi status 0x%x srb status 0x%x\n",
request->cdb[0], vstor_packet->vm_srb.scsi_status,
vstor_packet->vm_srb.srb_status);
}
if ((request->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_ext,
vstor_packet->vm_srb.sense_info_length);
/* ASSERT(vstor_packet->vm_srb.sense_info_length <= */
/* request->SenseBufferSize); */
memcpy(request->sense_buffer,
vstor_packet->vm_srb.sense_data,
vstor_packet->vm_srb.sense_info_length);
request->sense_buffer_size =
vstor_packet->vm_srb.sense_info_length;
}
}
/* TODO: */
request->bytes_xfer = vstor_packet->vm_srb.data_transfer_length;
request->on_io_completion(request);
atomic_dec(&stor_device->num_outstanding_req);
put_stor_device(device);
}
static void stor_vsc_on_receive(struct hv_device *device,
struct vstor_packet *vstor_packet,
struct storvsc_request_extension *request_ext)
{
switch (vstor_packet->operation) {
case VSTOR_OPERATION_COMPLETE_IO:
DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION");
stor_vsc_on_io_completion(device, vstor_packet, request_ext);
break;
case VSTOR_OPERATION_REMOVE_DEVICE:
DPRINT_INFO(STORVSC, "REMOVE_DEVICE_OPERATION");
/* TODO: */
break;
default:
DPRINT_INFO(STORVSC, "Unknown operation received - %d",
vstor_packet->operation);
break;
}
}
static void stor_vsc_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 storvsc_request_extension *request;
int ret;
/* ASSERT(device); */
stor_device = must_get_stor_device(device);
if (!stor_device) {
DPRINT_ERR(STORVSC, "unable to get stor device..."
"device being destroyed?");
return;
}
do {
ret = vmbus_recvpacket(device->channel, packet,
ALIGN(sizeof(struct vstor_packet), 8),
&bytes_recvd, &request_id);
if (ret == 0 && bytes_recvd > 0) {
DPRINT_DBG(STORVSC, "receive %d bytes - tid %llx",
bytes_recvd, request_id);
/* ASSERT(bytes_recvd ==
sizeof(struct vstor_packet)); */
request = (struct storvsc_request_extension *)
(unsigned long)request_id;
/* ASSERT(request);c */
/* if (vstor_packet.Flags & SYNTHETIC_FLAG) */
if ((request == &stor_device->init_request) ||
(request == &stor_device->reset_request)) {
/* DPRINT_INFO(STORVSC,
* "reset completion - operation "
* "%u status %u",
* vstor_packet.Operation,
* vstor_packet.Status); */
memcpy(&request->vstor_packet, packet,
sizeof(struct vstor_packet));
request->wait_condition = 1;
wake_up(&request->wait_event);
} else {
stor_vsc_on_receive(device,
(struct vstor_packet *)packet,
request);
}
} else {
/* DPRINT_DBG(STORVSC, "nothing else to read..."); */
break;
}
} while (1);
put_stor_device(device);
return;
}
static int stor_vsc_connect_to_vsp(struct hv_device *device)
{
struct vmstorage_channel_properties props;
struct storvsc_driver_object *stor_driver;
int ret;
stor_driver = (struct storvsc_driver_object *)device->drv;
memset(&props, 0, sizeof(struct vmstorage_channel_properties));
/* Open the channel */
ret = vmbus_open(device->channel,
stor_driver->ring_buffer_size,
stor_driver->ring_buffer_size,
(void *)&props,
sizeof(struct vmstorage_channel_properties),
stor_vsc_on_channel_callback, device);
DPRINT_DBG(STORVSC, "storage props: path id %d, tgt id %d, max xfer %d",
props.path_id, props.target_id, props.max_transfer_bytes);
if (ret != 0) {
DPRINT_ERR(STORVSC, "unable to open channel: %d", ret);
return -1;
}
ret = stor_vsc_channel_init(device);
return ret;
}
/*
* stor_vsc_on_device_add - Callback when the device belonging to this driver
* is added
*/
static int stor_vsc_on_device_add(struct hv_device *device,
void *additional_info)
{
struct storvsc_device *stor_device;
/* struct vmstorage_channel_properties *props; */
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) {
ret = -1;
goto cleanup;
}
/* Save the channel properties to our storvsc channel */
/* props = (struct vmstorage_channel_properties *)
* channel->offerMsg.Offer.u.Standard.UserDefined; */
/* FIXME: */
/*
* 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
*/
/* storChannel->PortNumber = 0;
storChannel->PathId = props->PathId;
storChannel->TargetId = props->TargetId; */
stor_device->port_number = device_info->port_number;
/* Send it back up */
ret = stor_vsc_connect_to_vsp(device);
/* device_info->PortNumber = stor_device->PortNumber; */
device_info->path_id = stor_device->path_id;
device_info->target_id = stor_device->target_id;
DPRINT_DBG(STORVSC, "assigned port %u, path %u target %u\n",
stor_device->port_number, stor_device->path_id,
stor_device->target_id);
cleanup:
return ret;
}
/*
* stor_vsc_on_device_remove - Callback when the our device is being removed
*/
static int stor_vsc_on_device_remove(struct hv_device *device)
{
struct storvsc_device *stor_device;
DPRINT_INFO(STORVSC, "disabling storage device (%p)...",
device->ext);
stor_device = release_stor_device(device);
/*
* At this point, all outbound traffic should be disable. We
* only allow inbound traffic (responses) to proceed so that
* outstanding requests can be completed.
*/
while (atomic_read(&stor_device->num_outstanding_req)) {
DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
atomic_read(&stor_device->num_outstanding_req));
udelay(100);
}
DPRINT_INFO(STORVSC, "removing storage device (%p)...",
device->ext);
stor_device = final_release_stor_device(device);
DPRINT_INFO(STORVSC, "storage device (%p) safe to remove", stor_device);
/* Close the channel */
vmbus_close(device->channel);
free_stor_device(stor_device);
return 0;
}
int stor_vsc_on_host_reset(struct hv_device *device)
{
struct storvsc_device *stor_device;
struct storvsc_request_extension *request;
struct vstor_packet *vstor_packet;
int ret;
DPRINT_INFO(STORVSC, "resetting host adapter...");
stor_device = get_stor_device(device);
if (!stor_device) {
DPRINT_ERR(STORVSC, "unable to get stor device..."
"device being destroyed?");
return -1;
}
request = &stor_device->reset_request;
vstor_packet = &request->vstor_packet;
init_waitqueue_head(&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;
request->wait_condition = 0;
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) {
DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d",
vstor_packet, ret);
goto cleanup;
}
wait_event_timeout(request->wait_event, request->wait_condition,
msecs_to_jiffies(1000));
if (request->wait_condition == 0) {
ret = -ETIMEDOUT;
goto cleanup;
}
DPRINT_INFO(STORVSC, "host adapter reset completed");
/*
* At this point, all outstanding requests in the adapter
* should have been flushed out and return to us
*/
cleanup:
put_stor_device(device);
return ret;
}
/*
* stor_vsc_on_io_request - Callback to initiate an I/O request
*/
static int stor_vsc_on_io_request(struct hv_device *device,
struct hv_storvsc_request *request)
{
struct storvsc_device *stor_device;
struct storvsc_request_extension *request_extension;
struct vstor_packet *vstor_packet;
int ret = 0;
request_extension =
(struct storvsc_request_extension *)request->extension;
vstor_packet = &request_extension->vstor_packet;
stor_device = get_stor_device(device);
DPRINT_DBG(STORVSC, "enter - Device %p, DeviceExt %p, Request %p, "
"Extension %p", device, stor_device, request,
request_extension);
DPRINT_DBG(STORVSC, "req %p len %d bus %d, target %d, lun %d cdblen %d",
request, request->data_buffer.len, request->bus,
request->target_id, request->lun_id, request->cdb_len);
if (!stor_device) {
DPRINT_ERR(STORVSC, "unable to get stor device..."
"device being destroyed?");
return -2;
}
/* print_hex_dump_bytes("", DUMP_PREFIX_NONE, request->Cdb,
* request->CdbLen); */
request_extension->request = request;
request_extension->device = device;
memset(vstor_packet, 0 , sizeof(struct vstor_packet));
vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
vstor_packet->vm_srb.port_number = request->host;
vstor_packet->vm_srb.path_id = request->bus;
vstor_packet->vm_srb.target_id = request->target_id;
vstor_packet->vm_srb.lun = request->lun_id;
vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE;
/* Copy over the scsi command descriptor block */
vstor_packet->vm_srb.cdb_length = request->cdb_len;
memcpy(&vstor_packet->vm_srb.cdb, request->cdb, request->cdb_len);
vstor_packet->vm_srb.data_in = request->type;
vstor_packet->vm_srb.data_transfer_length = request->data_buffer.len;
vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
DPRINT_DBG(STORVSC, "srb - len %d port %d, path %d, target %d, "
"lun %d senselen %d cdblen %d",
vstor_packet->vm_srb.length,
vstor_packet->vm_srb.port_number,
vstor_packet->vm_srb.path_id,
vstor_packet->vm_srb.target_id,
vstor_packet->vm_srb.lun,
vstor_packet->vm_srb.sense_info_length,
vstor_packet->vm_srb.cdb_length);
if (request_extension->request->data_buffer.len) {
ret = vmbus_sendpacket_multipagebuffer(device->channel,
&request_extension->request->data_buffer,
vstor_packet,
sizeof(struct vstor_packet),
(unsigned long)request_extension);
} else {
ret = vmbus_sendpacket(device->channel, vstor_packet,
sizeof(struct vstor_packet),
(unsigned long)request_extension,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
}
if (ret != 0) {
DPRINT_DBG(STORVSC, "Unable to send packet %p ret %d",
vstor_packet, ret);
}
atomic_inc(&stor_device->num_outstanding_req);
put_stor_device(device);
return ret;
}
/*
* stor_vsc_on_cleanup - Perform any cleanup when the driver is removed
*/
static void stor_vsc_on_cleanup(struct hv_driver *driver)
{
}
/*
* stor_vsc_initialize - Main entry point
*/
int stor_vsc_initialize(struct hv_driver *driver)
{
struct storvsc_driver_object *stor_driver;
stor_driver = (struct storvsc_driver_object *)driver;
DPRINT_DBG(STORVSC, "sizeof(STORVSC_REQUEST)=%zd "
"sizeof(struct storvsc_request_extension)=%zd "
"sizeof(struct vstor_packet)=%zd, "
"sizeof(struct vmscsi_request)=%zd",
sizeof(struct hv_storvsc_request),
sizeof(struct storvsc_request_extension),
sizeof(struct vstor_packet),
sizeof(struct vmscsi_request));
/* Make sure we are at least 2 pages since 1 page is used for control */
/* ASSERT(stor_driver->RingBufferSize >= (PAGE_SIZE << 1)); */
driver->name = g_driver_name;
memcpy(&driver->dev_type, &gStorVscDeviceType,
sizeof(struct hv_guid));
stor_driver->request_ext_size =
sizeof(struct storvsc_request_extension);
/*
* 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)
*/
stor_driver->max_outstanding_req_per_channel =
((stor_driver->ring_buffer_size - PAGE_SIZE) /
ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
sizeof(struct vstor_packet) + sizeof(u64),
sizeof(u64)));
DPRINT_INFO(STORVSC, "max io %u, currently %u\n",
stor_driver->max_outstanding_req_per_channel,
STORVSC_MAX_IO_REQUESTS);
/* Setup the dispatch table */
stor_driver->base.dev_add = stor_vsc_on_device_add;
stor_driver->base.dev_rm = stor_vsc_on_device_remove;
stor_driver->base.cleanup = stor_vsc_on_cleanup;
stor_driver->on_io_request = stor_vsc_on_io_request;
return 0;
}