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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/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/blkdev.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_devinfo.h>
#include <scsi/scsi_dbg.h>
#include "hyperv.h"
#include "hyperv_storage.h"
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)");
static const char *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
}
};
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 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);
DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld",
sdevice, PAGE_SIZE);
blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine",
sdevice);
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;
}
/*
* storvsc_remove - Callback when our device is removed
*/
static int storvsc_remove(struct hv_device *dev)
{
struct Scsi_Host *host = dev_get_drvdata(&dev->device);
struct hv_host_device *host_dev =
(struct hv_host_device *)host->hostdata;
/*
* Call to the vsc driver to let it know that the device is being
* removed
*/
storvsc_dev_remove(dev);
if (host_dev->request_pool) {
kmem_cache_destroy(host_dev->request_pool);
host_dev->request_pool = NULL;
}
DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host);
scsi_remove_host(host);
DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host);
scsi_host_put(host);
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;
DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", (int)cylinders, heads,
sectors_pt);
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;
DPRINT_INFO(STORVSC, "resetting host adapter...");
stor_device = get_stor_device(device);
if (!stor_device)
return -1;
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;
}
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;
}
/*
* 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;
DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...",
scmnd->device, dev);
/* Invokes the vsc to reset the host/bus */
ret = storvsc_host_reset(dev);
if (ret != 0)
return ret;
DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted",
scmnd->device, dev);
return ret;
}
/*
* storvsc_commmand_completion - Command completion processing
*/
static void storvsc_commmand_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;
if (cmd_request->bounce_sgl_count) {
/* FIXME: We can optimize on writes by just skipping this */
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);
}
vm_srb = &request->vstor_packet.vm_srb;
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;
/* !!DO NOT MODIFY the scmnd after this call */
scsi_done_fn(scmnd);
kmem_cache_free(host_dev->request_pool, cmd_request);
}
/*
* 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 retrying, no need to prep the cmd */
if (scmnd->host_scribble) {
cmd_request =
(struct storvsc_cmd_request *)scmnd->host_scribble;
DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p",
scmnd, cmd_request);
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_commmand_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;
/*
* FIXME: We can optimize on reads by just skipping
* this
*/
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 == -1) {
/* no more space */
if (cmd_request->bounce_sgl_count) {
/*
* FIXME: We can optimize on writes by just skipping
* this
*/
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);
}
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,
};
/*
* storvsc_probe - Add a new device for this driver
*/
static int storvsc_probe(struct hv_device *device)
{
int ret;
struct Scsi_Host *host;
struct hv_host_device *host_dev;
struct storvsc_device_info device_info;
host = scsi_host_alloc(&scsi_driver,
sizeof(struct hv_host_device));
if (!host)
return -ENOMEM;
dev_set_drvdata(&device->device, host);
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;
}
device_info.port_number = host->host_no;
device_info.ring_buffer_size = storvsc_ringbuffer_size;
/* Call to the vsc driver to add the device */
ret = storvsc_dev_add(device, (void *)&device_info);
if (ret != 0) {
kmem_cache_destroy(host_dev->request_pool);
scsi_host_put(host);
return -1;
}
host_dev->path = device_info.path_id;
host_dev->target = device_info.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) {
storvsc_dev_remove(device);
kmem_cache_destroy(host_dev->request_pool);
scsi_host_put(host);
return -1;
}
scsi_scan_host(host);
return ret;
}
/* The one and only one */
static struct hv_driver storvsc_drv = {
.probe = storvsc_probe,
.remove = storvsc_remove,
};
/*
* storvsc_drv_init - StorVsc driver initialization.
*/
static int storvsc_drv_init(void)
{
int ret;
struct hv_driver *drv = &storvsc_drv;
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)));
memcpy(&drv->dev_type, &gStorVscDeviceType,
sizeof(struct hv_guid));
if (max_outstanding_req_per_channel <
STORVSC_MAX_IO_REQUESTS)
return -1;
drv->name = driver_name;
drv->driver.name = driver_name;
/* The driver belongs to vmbus */
ret = vmbus_child_driver_register(&drv->driver);
return ret;
}
static void storvsc_drv_exit(void)
{
vmbus_child_driver_unregister(&storvsc_drv.driver);
}
static int __init storvsc_init(void)
{
int ret;
DPRINT_INFO(STORVSC_DRV, "Storvsc initializing....");
ret = storvsc_drv_init();
return ret;
}
static void __exit storvsc_exit(void)
{
storvsc_drv_exit();
}
MODULE_LICENSE("GPL");
MODULE_VERSION(HV_DRV_VERSION);
MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
module_init(storvsc_init);
module_exit(storvsc_exit);
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