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linux-next/drivers/scsi/storvsc_drv.c
K. Y. Srinivasan 42e22cac4e [SCSI] storvsc: Properly handle errors from the host 
Hyper-V cannot process some commands like ATA_12 and ATA_16. It also returns a
very generic error when this happens (SRB_STATUS_ERROR).  Most of the time we
treat SRB_STATUS_ERROR as DID_TARGET_FAILURE which causes error handler retry,
but in the case of pass through commands, they'll never succeed (and the error
handler will offline the device), so put a discriminating block in the command
completion routing and send the SRB_STATUS_ERROR upwards with DID_PASSTHROUGH
for commands we know should not be retried.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-04-25 09:51:43 +01:00

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/*
* Copyright (c) 2009, Microsoft Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Authors:
* Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com>
* K. Y. Srinivasan <kys@microsoft.com>
*/
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/completion.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/hyperv.h>
#include <linux/mempool.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_devinfo.h>
#include <scsi/scsi_dbg.h>
/*
* All wire protocol details (storage protocol between the guest and the host)
* are consolidated here.
*
* Begin protocol definitions.
*/
/*
* Version history:
* V1 Beta: 0.1
* V1 RC < 2008/1/31: 1.0
* V1 RC > 2008/1/31: 2.0
* Win7: 4.2
*/
#define VMSTOR_CURRENT_MAJOR 4
#define VMSTOR_CURRENT_MINOR 2
/* Packet structure describing virtual storage requests. */
enum vstor_packet_operation {
VSTOR_OPERATION_COMPLETE_IO = 1,
VSTOR_OPERATION_REMOVE_DEVICE = 2,
VSTOR_OPERATION_EXECUTE_SRB = 3,
VSTOR_OPERATION_RESET_LUN = 4,
VSTOR_OPERATION_RESET_ADAPTER = 5,
VSTOR_OPERATION_RESET_BUS = 6,
VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
VSTOR_OPERATION_END_INITIALIZATION = 8,
VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
VSTOR_OPERATION_QUERY_PROPERTIES = 10,
VSTOR_OPERATION_ENUMERATE_BUS = 11,
VSTOR_OPERATION_MAXIMUM = 11
};
/*
* Platform neutral description of a scsi request -
* this remains the same across the write regardless of 32/64 bit
* note: it's patterned off the SCSI_PASS_THROUGH structure
*/
#define STORVSC_MAX_CMD_LEN 0x10
#define STORVSC_SENSE_BUFFER_SIZE 0x12
#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
struct vmscsi_request {
u16 length;
u8 srb_status;
u8 scsi_status;
u8 port_number;
u8 path_id;
u8 target_id;
u8 lun;
u8 cdb_length;
u8 sense_info_length;
u8 data_in;
u8 reserved;
u32 data_transfer_length;
union {
u8 cdb[STORVSC_MAX_CMD_LEN];
u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
};
} __attribute((packed));
/*
* This structure is sent during the intialization phase to get the different
* properties of the channel.
*/
struct vmstorage_channel_properties {
u16 protocol_version;
u8 path_id;
u8 target_id;
/* Note: port number is only really known on the client side */
u32 port_number;
u32 flags;
u32 max_transfer_bytes;
/*
* This id is unique for each channel and will correspond with
* vendor specific data in the inquiry data.
*/
u64 unique_id;
} __packed;
/* This structure is sent during the storage protocol negotiations. */
struct vmstorage_protocol_version {
/* Major (MSW) and minor (LSW) version numbers. */
u16 major_minor;
/*
* Revision number is auto-incremented whenever this file is changed
* (See FILL_VMSTOR_REVISION macro above). Mismatch does not
* definitely indicate incompatibility--but it does indicate mismatched
* builds.
* This is only used on the windows side. Just set it to 0.
*/
u16 revision;
} __packed;
/* Channel Property Flags */
#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
struct vstor_packet {
/* Requested operation type */
enum vstor_packet_operation operation;
/* Flags - see below for values */
u32 flags;
/* Status of the request returned from the server side. */
u32 status;
/* Data payload area */
union {
/*
* Structure used to forward SCSI commands from the
* client to the server.
*/
struct vmscsi_request vm_srb;
/* Structure used to query channel properties. */
struct vmstorage_channel_properties storage_channel_properties;
/* Used during version negotiations. */
struct vmstorage_protocol_version version;
};
} __packed;
/*
* Packet Flags:
*
* This flag indicates that the server should send back a completion for this
* packet.
*/
#define REQUEST_COMPLETION_FLAG 0x1
/* Matches Windows-end */
enum storvsc_request_type {
WRITE_TYPE = 0,
READ_TYPE,
UNKNOWN_TYPE,
};
/*
* SRB status codes and masks; a subset of the codes used here.
*/
#define SRB_STATUS_AUTOSENSE_VALID 0x80
#define SRB_STATUS_INVALID_LUN 0x20
#define SRB_STATUS_SUCCESS 0x01
#define SRB_STATUS_ERROR 0x04
/*
* This is the end of Protocol specific defines.
*/
/*
* We setup a mempool to allocate request structures for this driver
* on a per-lun basis. The following define specifies the number of
* elements in the pool.
*/
#define STORVSC_MIN_BUF_NR 64
static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
module_param(storvsc_ringbuffer_size, int, S_IRUGO);
MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
#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
struct storvsc_cmd_request {
struct list_head entry;
struct scsi_cmnd *cmd;
unsigned int bounce_sgl_count;
struct scatterlist *bounce_sgl;
struct hv_device *device;
/* Synchronize the request/response if needed */
struct completion wait_event;
unsigned char *sense_buffer;
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 storvsc_cmd_request init_request;
struct storvsc_cmd_request reset_request;
};
struct stor_mem_pools {
struct kmem_cache *request_pool;
mempool_t *request_mempool;
};
struct hv_host_device {
struct hv_device *dev;
unsigned int port;
unsigned char path;
unsigned char target;
};
struct storvsc_scan_work {
struct work_struct work;
struct Scsi_Host *host;
uint lun;
};
static void storvsc_bus_scan(struct work_struct *work)
{
struct storvsc_scan_work *wrk;
int id, order_id;
wrk = container_of(work, struct storvsc_scan_work, work);
for (id = 0; id < wrk->host->max_id; ++id) {
if (wrk->host->reverse_ordering)
order_id = wrk->host->max_id - id - 1;
else
order_id = id;
scsi_scan_target(&wrk->host->shost_gendev, 0,
order_id, SCAN_WILD_CARD, 1);
}
kfree(wrk);
}
static void storvsc_remove_lun(struct work_struct *work)
{
struct storvsc_scan_work *wrk;
struct scsi_device *sdev;
wrk = container_of(work, struct storvsc_scan_work, work);
if (!scsi_host_get(wrk->host))
goto done;
sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
if (sdev) {
scsi_remove_device(sdev);
scsi_device_put(sdev);
}
scsi_host_put(wrk->host);
done:
kfree(wrk);
}
/*
* Major/minor macros. Minor version is in LSB, meaning that earlier flat
* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
*/
static inline u16 storvsc_get_version(u8 major, u8 minor)
{
u16 version;
version = ((major << 8) | minor);
return version;
}
/*
* We can get incoming messages from the host that are not in response to
* messages that we have sent out. An example of this would be messages
* received by the guest to notify dynamic addition/removal of LUNs. To
* deal with potential race conditions where the driver may be in the
* midst of being unloaded when we might receive an unsolicited message
* from the host, we have implemented a mechanism to gurantee sequential
* consistency:
*
* 1) Once the device is marked as being destroyed, we will fail all
* outgoing messages.
* 2) We permit incoming messages when the device is being destroyed,
* only to properly account for messages already sent out.
*/
static inline struct storvsc_device *get_out_stor_device(
struct hv_device *device)
{
struct storvsc_device *stor_device;
stor_device = hv_get_drvdata(device);
if (stor_device && stor_device->destroy)
stor_device = NULL;
return stor_device;
}
static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
{
dev->drain_notify = true;
wait_event(dev->waiting_to_drain,
atomic_read(&dev->num_outstanding_req) == 0);
dev->drain_notify = false;
}
static inline struct storvsc_device *get_in_stor_device(
struct hv_device *device)
{
struct storvsc_device *stor_device;
stor_device = hv_get_drvdata(device);
if (!stor_device)
goto get_in_err;
/*
* If the device is being destroyed; allow incoming
* traffic only to cleanup outstanding requests.
*/
if (stor_device->destroy &&
(atomic_read(&stor_device->num_outstanding_req) == 0))
stor_device = NULL;
get_in_err:
return stor_device;
}
static void destroy_bounce_buffer(struct scatterlist *sgl,
unsigned int sg_count)
{
int i;
struct page *page_buf;
for (i = 0; i < sg_count; i++) {
page_buf = sg_page((&sgl[i]));
if (page_buf != NULL)
__free_page(page_buf);
}
kfree(sgl);
}
static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
{
int i;
/* No need to check */
if (sg_count < 2)
return -1;
/* We have at least 2 sg entries */
for (i = 0; i < sg_count; i++) {
if (i == 0) {
/* make sure 1st one does not have hole */
if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
return i;
} else if (i == sg_count - 1) {
/* make sure last one does not have hole */
if (sgl[i].offset != 0)
return i;
} else {
/* make sure no hole in the middle */
if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
return i;
}
}
return -1;
}
static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
unsigned int sg_count,
unsigned int len,
int write)
{
int i;
int num_pages;
struct scatterlist *bounce_sgl;
struct page *page_buf;
unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
if (!bounce_sgl)
return NULL;
for (i = 0; i < num_pages; i++) {
page_buf = alloc_page(GFP_ATOMIC);
if (!page_buf)
goto cleanup;
sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
}
return bounce_sgl;
cleanup:
destroy_bounce_buffer(bounce_sgl, num_pages);
return NULL;
}
/* Disgusting wrapper functions */
static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx)
{
void *addr = kmap_atomic(sg_page(sgl + idx));
return (unsigned long)addr;
}
static inline void sg_kunmap_atomic(unsigned long addr)
{
kunmap_atomic((void *)addr);
}
/* Assume the original sgl has enough room */
static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
struct scatterlist *bounce_sgl,
unsigned int orig_sgl_count,
unsigned int bounce_sgl_count)
{
int i;
int j = 0;
unsigned long src, dest;
unsigned int srclen, destlen, copylen;
unsigned int total_copied = 0;
unsigned long bounce_addr = 0;
unsigned long dest_addr = 0;
unsigned long flags;
local_irq_save(flags);
for (i = 0; i < orig_sgl_count; i++) {
dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
dest = dest_addr;
destlen = orig_sgl[i].length;
if (bounce_addr == 0)
bounce_addr = sg_kmap_atomic(bounce_sgl,j);
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 */
sg_kunmap_atomic(bounce_addr);
j++;
/*
* It is possible that the number of elements
* in the bounce buffer may not be equal to
* the number of elements in the original
* scatter list. Handle this correctly.
*/
if (j == bounce_sgl_count) {
/*
* We are done; cleanup and return.
*/
sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
local_irq_restore(flags);
return total_copied;
}
/* if we need to use another bounce buffer */
if (destlen || i != orig_sgl_count - 1)
bounce_addr = sg_kmap_atomic(bounce_sgl,j);
} else if (destlen == 0 && i == orig_sgl_count - 1) {
/* unmap the last bounce that is < PAGE_SIZE */
sg_kunmap_atomic(bounce_addr);
}
}
sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
}
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 = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
src = src_addr;
srclen = orig_sgl[i].length;
if (bounce_addr == 0)
bounce_addr = sg_kmap_atomic(bounce_sgl,j);
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 */
sg_kunmap_atomic(bounce_addr);
j++;
/* if we need to use another bounce buffer */
if (srclen || i != orig_sgl_count - 1)
bounce_addr = sg_kmap_atomic(bounce_sgl,j);
} else if (srclen == 0 && i == orig_sgl_count - 1) {
/* unmap the last bounce that is < PAGE_SIZE */
sg_kunmap_atomic(bounce_addr);
}
}
sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
}
local_irq_restore(flags);
return total_copied;
}
static int storvsc_channel_init(struct hv_device *device)
{
struct storvsc_device *stor_device;
struct storvsc_cmd_request *request;
struct vstor_packet *vstor_packet;
int ret, t;
stor_device = get_out_stor_device(device);
if (!stor_device)
return -ENODEV;
request = &stor_device->init_request;
vstor_packet = &request->vstor_packet;
/*
* Now, initiate the vsc/vsp initialization protocol on the open
* channel
*/
memset(request, 0, sizeof(struct storvsc_cmd_request));
init_completion(&request->wait_event);
vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
vstor_packet->flags = REQUEST_COMPLETION_FLAG;
ret = vmbus_sendpacket(device->channel, vstor_packet,
sizeof(struct vstor_packet),
(unsigned long)request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
if (ret != 0)
goto cleanup;
t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
if (t == 0) {
ret = -ETIMEDOUT;
goto cleanup;
}
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
vstor_packet->status != 0)
goto cleanup;
/* reuse the packet for version range supported */
memset(vstor_packet, 0, sizeof(struct vstor_packet));
vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
vstor_packet->flags = REQUEST_COMPLETION_FLAG;
vstor_packet->version.major_minor =
storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR);
/*
* The revision number is only used in Windows; set it to 0.
*/
vstor_packet->version.revision = 0;
ret = vmbus_sendpacket(device->channel, vstor_packet,
sizeof(struct vstor_packet),
(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_command_completion(struct storvsc_cmd_request *cmd_request)
{
struct scsi_cmnd *scmnd = cmd_request->cmd;
struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
void (*scsi_done_fn)(struct scsi_cmnd *);
struct scsi_sense_hdr sense_hdr;
struct vmscsi_request *vm_srb;
struct storvsc_scan_work *wrk;
struct stor_mem_pools *memp = scmnd->device->hostdata;
vm_srb = &cmd_request->vstor_packet.vm_srb;
if (cmd_request->bounce_sgl_count) {
if (vm_srb->data_in == READ_TYPE)
copy_from_bounce_buffer(scsi_sglist(scmnd),
cmd_request->bounce_sgl,
scsi_sg_count(scmnd),
cmd_request->bounce_sgl_count);
destroy_bounce_buffer(cmd_request->bounce_sgl,
cmd_request->bounce_sgl_count);
}
/*
* If there is an error; offline the device since all
* error recovery strategies would have already been
* deployed on the host side. However, if the command
* were a pass-through command deal with it appropriately.
*/
scmnd->result = vm_srb->scsi_status;
if (vm_srb->srb_status == SRB_STATUS_ERROR) {
switch (scmnd->cmnd[0]) {
case ATA_16:
case ATA_12:
set_host_byte(scmnd, DID_PASSTHROUGH);
break;
default:
set_host_byte(scmnd, DID_TARGET_FAILURE);
}
}
/*
* If the LUN is invalid; remove the device.
*/
if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) {
struct storvsc_device *stor_dev;
struct hv_device *dev = host_dev->dev;
struct Scsi_Host *host;
stor_dev = get_in_stor_device(dev);
host = stor_dev->host;
wrk = kmalloc(sizeof(struct storvsc_scan_work),
GFP_ATOMIC);
if (!wrk) {
scmnd->result = DID_TARGET_FAILURE << 16;
} else {
wrk->host = host;
wrk->lun = vm_srb->lun;
INIT_WORK(&wrk->work, storvsc_remove_lun);
schedule_work(&wrk->work);
}
}
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,
cmd_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);
mempool_free(cmd_request, memp->request_mempool);
}
static void storvsc_on_io_completion(struct hv_device *device,
struct vstor_packet *vstor_packet,
struct storvsc_cmd_request *request)
{
struct storvsc_device *stor_device;
struct vstor_packet *stor_pkt;
stor_device = hv_get_drvdata(device);
stor_pkt = &request->vstor_packet;
/*
* The current SCSI handling on the host side does
* not correctly handle:
* INQUIRY command with page code parameter set to 0x80
* MODE_SENSE command with cmd[2] == 0x1c
*
* Setup srb and scsi status so this won't be fatal.
* We do this so we can distinguish truly fatal failues
* (srb status == 0x4) and off-line the device in that case.
*/
if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
(stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
vstor_packet->vm_srb.scsi_status = 0;
vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
}
/* Copy over the status...etc */
stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
stor_pkt->vm_srb.sense_info_length =
vstor_packet->vm_srb.sense_info_length;
if (vstor_packet->vm_srb.scsi_status != 0 ||
vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){
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 &
SRB_STATUS_AUTOSENSE_VALID) {
/* 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;
storvsc_command_completion(request);
if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
stor_device->drain_notify)
wake_up(&stor_device->waiting_to_drain);
}
static void storvsc_on_receive(struct hv_device *device,
struct vstor_packet *vstor_packet,
struct storvsc_cmd_request *request)
{
struct storvsc_scan_work *work;
struct storvsc_device *stor_device;
switch (vstor_packet->operation) {
case VSTOR_OPERATION_COMPLETE_IO:
storvsc_on_io_completion(device, vstor_packet, request);
break;
case VSTOR_OPERATION_REMOVE_DEVICE:
case VSTOR_OPERATION_ENUMERATE_BUS:
stor_device = get_in_stor_device(device);
work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
if (!work)
return;
INIT_WORK(&work->work, storvsc_bus_scan);
work->host = stor_device->host;
schedule_work(&work->work);
break;
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 storvsc_cmd_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 storvsc_cmd_request *)
(unsigned long)request_id;
if ((request == &stor_device->init_request) ||
(request == &stor_device->reset_request)) {
memcpy(&request->vstor_packet, packet,
sizeof(struct vstor_packet));
complete(&request->wait_event);
} else {
storvsc_on_receive(device,
(struct vstor_packet *)packet,
request);
}
} else {
break;
}
} while (1);
return;
}
static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
{
struct vmstorage_channel_properties props;
int ret;
memset(&props, 0, sizeof(struct vmstorage_channel_properties));
ret = vmbus_open(device->channel,
ring_size,
ring_size,
(void *)&props,
sizeof(struct vmstorage_channel_properties),
storvsc_on_channel_callback, device);
if (ret != 0)
return ret;
ret = storvsc_channel_init(device);
return ret;
}
static int storvsc_dev_remove(struct hv_device *device)
{
struct storvsc_device *stor_device;
unsigned long flags;
stor_device = hv_get_drvdata(device);
spin_lock_irqsave(&device->channel->inbound_lock, flags);
stor_device->destroy = true;
spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
/*
* At this point, all outbound traffic should be disable. We
* only allow inbound traffic (responses) to proceed so that
* outstanding requests can be completed.
*/
storvsc_wait_to_drain(stor_device);
/*
* Since we have already drained, we don't need to busy wait
* as was done in final_release_stor_device()
* Note that we cannot set the ext pointer to NULL until
* we have drained - to drain the outgoing packets, we need to
* allow incoming packets.
*/
spin_lock_irqsave(&device->channel->inbound_lock, flags);
hv_set_drvdata(device, NULL);
spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
/* Close the channel */
vmbus_close(device->channel);
kfree(stor_device);
return 0;
}
static int storvsc_do_io(struct hv_device *device,
struct storvsc_cmd_request *request)
{
struct storvsc_device *stor_device;
struct vstor_packet *vstor_packet;
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 = STORVSC_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 int storvsc_device_alloc(struct scsi_device *sdevice)
{
struct stor_mem_pools *memp;
int number = STORVSC_MIN_BUF_NR;
memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
if (!memp)
return -ENOMEM;
memp->request_pool =
kmem_cache_create(dev_name(&sdevice->sdev_dev),
sizeof(struct storvsc_cmd_request), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!memp->request_pool)
goto err0;
memp->request_mempool = mempool_create(number, mempool_alloc_slab,
mempool_free_slab,
memp->request_pool);
if (!memp->request_mempool)
goto err1;
sdevice->hostdata = memp;
return 0;
err1:
kmem_cache_destroy(memp->request_pool);
err0:
kfree(memp);
return -ENOMEM;
}
static void storvsc_device_destroy(struct scsi_device *sdevice)
{
struct stor_mem_pools *memp = sdevice->hostdata;
mempool_destroy(memp->request_mempool);
kmem_cache_destroy(memp->request_pool);
kfree(memp);
sdevice->hostdata = NULL;
}
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_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
return 0;
}
static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
sector_t capacity, int *info)
{
sector_t nsect = capacity;
sector_t cylinders = nsect;
int heads, sectors_pt;
/*
* We are making up these values; let us keep it simple.
*/
heads = 0xff;
sectors_pt = 0x3f; /* Sectors per track */
sector_div(cylinders, heads * sectors_pt);
if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
cylinders = 0xffff;
info[0] = heads;
info[1] = sectors_pt;
info[2] = (int)cylinders;
return 0;
}
static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
{
struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
struct hv_device *device = host_dev->dev;
struct storvsc_device *stor_device;
struct storvsc_cmd_request *request;
struct vstor_packet *vstor_packet;
int ret, t;
stor_device = get_out_stor_device(device);
if (!stor_device)
return FAILED;
request = &stor_device->reset_request;
vstor_packet = &request->vstor_packet;
init_completion(&request->wait_event);
vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
vstor_packet->flags = REQUEST_COMPLETION_FLAG;
vstor_packet->vm_srb.path_id = stor_device->path_id;
ret = vmbus_sendpacket(device->channel, vstor_packet,
sizeof(struct vstor_packet),
(unsigned long)&stor_device->reset_request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
if (ret != 0)
return FAILED;
t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
if (t == 0)
return TIMEOUT_ERROR;
/*
* At this point, all outstanding requests in the adapter
* should have been flushed out and return to us
*/
return SUCCESS;
}
static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
{
bool allowed = true;
u8 scsi_op = scmnd->cmnd[0];
switch (scsi_op) {
/*
* smartd sends this command and the host does not handle
* this. So, don't send it.
*/
case SET_WINDOW:
scmnd->result = ILLEGAL_REQUEST << 16;
allowed = false;
break;
default:
break;
}
return allowed;
}
static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
{
int ret;
struct hv_host_device *host_dev = shost_priv(host);
struct hv_device *dev = host_dev->dev;
struct storvsc_cmd_request *cmd_request;
unsigned int request_size = 0;
int i;
struct scatterlist *sgl;
unsigned int sg_count = 0;
struct vmscsi_request *vm_srb;
struct stor_mem_pools *memp = scmnd->device->hostdata;
if (!storvsc_scsi_cmd_ok(scmnd)) {
scmnd->scsi_done(scmnd);
return 0;
}
request_size = sizeof(struct storvsc_cmd_request);
cmd_request = mempool_alloc(memp->request_mempool,
GFP_ATOMIC);
/*
* We might be invoked in an interrupt context; hence
* mempool_alloc() can fail.
*/
if (!cmd_request)
return SCSI_MLQUEUE_DEVICE_BUSY;
memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
/* Setup the cmd request */
cmd_request->cmd = scmnd;
scmnd->host_scribble = (unsigned char *)cmd_request;
vm_srb = &cmd_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;
}
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);
cmd_request->sense_buffer = scmnd->sense_buffer;
cmd_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),
vm_srb->data_in);
if (!cmd_request->bounce_sgl) {
ret = SCSI_MLQUEUE_HOST_BUSY;
goto queue_error;
}
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;
}
cmd_request->data_buffer.offset = sgl[0].offset;
for (i = 0; i < sg_count; i++)
cmd_request->data_buffer.pfn_array[i] =
page_to_pfn(sg_page((&sgl[i])));
} else if (scsi_sglist(scmnd)) {
cmd_request->data_buffer.offset =
virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
cmd_request->data_buffer.pfn_array[0] =
virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
}
/* Invokes the vsc to start an IO */
ret = storvsc_do_io(dev, cmd_request);
if (ret == -EAGAIN) {
/* no more space */
if (cmd_request->bounce_sgl_count) {
destroy_bounce_buffer(cmd_request->bounce_sgl,
cmd_request->bounce_sgl_count);
ret = SCSI_MLQUEUE_DEVICE_BUSY;
goto queue_error;
}
}
return 0;
queue_error:
mempool_free(cmd_request, memp->request_mempool);
scmnd->host_scribble = NULL;
return ret;
}
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_destroy = storvsc_device_destroy,
.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,
.use_clustering = DISABLE_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);
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 target = 0;
struct storvsc_device *stor_device;
host = scsi_host_alloc(&scsi_driver,
sizeof(struct hv_host_device));
if (!host)
return -ENOMEM;
host_dev = shost_priv(host);
memset(host_dev, 0, sizeof(struct hv_host_device));
host_dev->port = host->host_no;
host_dev->dev = device;
stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
if (!stor_device) {
ret = -ENOMEM;
goto err_out0;
}
stor_device->destroy = false;
init_waitqueue_head(&stor_device->waiting_to_drain);
stor_device->device = device;
stor_device->host = host;
hv_set_drvdata(device, stor_device);
stor_device->port_number = host->host_no;
ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
if (ret)
goto err_out1;
host_dev->path = stor_device->path_id;
host_dev->target = stor_device->target_id;
/* 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_out2;
if (!dev_is_ide) {
scsi_scan_host(host);
} else {
target = (device->dev_instance.b[5] << 8 |
device->dev_instance.b[4]);
ret = scsi_add_device(host, 0, target, 0);
if (ret) {
scsi_remove_host(host);
goto err_out2;
}
}
return 0;
err_out2:
/*
* Once we have connected with the host, we would need to
* to invoke storvsc_dev_remove() to rollback this state and
* this call also frees up the stor_device; hence the jump around
* err_out1 label.
*/
storvsc_dev_remove(device);
goto err_out0;
err_out1:
kfree(stor_device);
err_out0:
scsi_host_put(host);
return ret;
}
static int storvsc_remove(struct hv_device *dev)
{
struct storvsc_device *stor_device = hv_get_drvdata(dev);
struct Scsi_Host *host = stor_device->host;
scsi_remove_host(host);
storvsc_dev_remove(dev);
scsi_host_put(host);
return 0;
}
static struct hv_driver storvsc_drv = {
.name = KBUILD_MODNAME,
.id_table = id_table,
.probe = storvsc_probe,
.remove = storvsc_remove,
};
static int __init storvsc_drv_init(void)
{
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);
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