mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 18:39:59 +00:00
![Greg Kroah-Hartman](/assets/img/avatar_default.png)
The #define KERNEL_2_6_27 needs to be set, and I adjusted the include directories a bit to get things to build properly. I also fixed up the direct access of bus_id, as that field is now gone. Some minor scsi api changes were needed as well. The hv_storvsc code should now build properly, with no errors. Cc: Hank Janssen <hjanssen@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1414 lines
38 KiB
C
1414 lines
38 KiB
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>
|
|
*
|
|
*/
|
|
|
|
#define KERNEL_2_6_27
|
|
|
|
#include <linux/init.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>
|
|
|
|
#ifdef KERNEL_2_6_5
|
|
#else
|
|
#include <scsi/scsi_dbg.h>
|
|
#endif
|
|
|
|
#include "include/logging.h"
|
|
#include "include/vmbus.h"
|
|
|
|
#include "include/StorVscApi.h"
|
|
|
|
//
|
|
// #defines
|
|
//
|
|
|
|
//
|
|
// Data types
|
|
//
|
|
struct host_device_context {
|
|
struct work_struct host_rescan_work; //must be 1st field
|
|
struct device_context *device_ctx; // point back to our device context
|
|
#ifdef KERNEL_2_6_27
|
|
struct kmem_cache *request_pool;
|
|
#else
|
|
kmem_cache_t *request_pool;
|
|
#endif
|
|
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;
|
|
|
|
STORVSC_REQUEST request;
|
|
// !!!DO NOT ADD ANYTHING BELOW HERE!!!
|
|
// The extension buffer falls right here and is pointed to by request.Extension;
|
|
};
|
|
|
|
struct storvsc_driver_context {
|
|
// !! These must be the first 2 fields !!
|
|
struct driver_context drv_ctx;
|
|
STORVSC_DRIVER_OBJECT drv_obj;
|
|
};
|
|
|
|
// Static decl
|
|
static int storvsc_probe(struct device *dev);
|
|
static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *));
|
|
static int storvsc_device_alloc(struct scsi_device *);
|
|
static int storvsc_device_configure(struct scsi_device *);
|
|
static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd);
|
|
#ifdef KERNEL_2_6_27
|
|
static void storvsc_host_rescan_callback(struct work_struct *work);
|
|
#else
|
|
static void storvsc_host_rescan_callback(void* context);
|
|
#endif
|
|
static void storvsc_host_rescan(DEVICE_OBJECT* device_obj);
|
|
static int storvsc_remove(struct device *dev);
|
|
|
|
static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len);
|
|
static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count);
|
|
static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count);
|
|
static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count);
|
|
static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count);
|
|
|
|
static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count);
|
|
static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info);
|
|
|
|
|
|
static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;
|
|
|
|
// The one and only one
|
|
static struct storvsc_driver_context g_storvsc_drv;
|
|
|
|
// 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,
|
|
.can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, // 64 max_queue * 1 target
|
|
.this_id = -1,
|
|
// no use setting to 0 since ll_blk_rw reset it to 1
|
|
.sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,// currently 32
|
|
// 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,
|
|
};
|
|
|
|
|
|
/*++
|
|
|
|
Name: storvsc_drv_init()
|
|
|
|
Desc: StorVsc driver initialization.
|
|
|
|
--*/
|
|
int storvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init)
|
|
{
|
|
int ret=0;
|
|
STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj;
|
|
struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx;
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface);
|
|
|
|
storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size;
|
|
storvsc_drv_obj->OnHostRescan = storvsc_host_rescan;
|
|
|
|
// Callback to client driver to complete the initialization
|
|
pfn_drv_init(&storvsc_drv_obj->Base);
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "request extension size %u, max outstanding reqs %u", storvsc_drv_obj->RequestExtSize, storvsc_drv_obj->MaxOutstandingRequestsPerChannel);
|
|
|
|
if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < STORVSC_MAX_IO_REQUESTS)
|
|
{
|
|
DPRINT_ERR(STORVSC_DRV, "The number of outstanding io requests (%d) is larger than that supported (%d) internally.",
|
|
STORVSC_MAX_IO_REQUESTS, storvsc_drv_obj->MaxOutstandingRequestsPerChannel);
|
|
return -1;
|
|
}
|
|
|
|
drv_ctx->driver.name = storvsc_drv_obj->Base.name;
|
|
memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, sizeof(GUID));
|
|
|
|
#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
|
|
drv_ctx->driver.probe = storvsc_probe;
|
|
drv_ctx->driver.remove = storvsc_remove;
|
|
#else
|
|
drv_ctx->probe = storvsc_probe;
|
|
drv_ctx->remove = storvsc_remove;
|
|
#endif
|
|
|
|
// The driver belongs to vmbus
|
|
vmbus_child_driver_register(drv_ctx);
|
|
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int storvsc_drv_exit_cb(struct device *dev, void *data)
|
|
{
|
|
struct device **curr = (struct device **)data;
|
|
*curr = dev;
|
|
return 1; // stop iterating
|
|
}
|
|
|
|
/*++
|
|
|
|
Name: storvsc_drv_exit()
|
|
|
|
Desc:
|
|
|
|
--*/
|
|
void storvsc_drv_exit(void)
|
|
{
|
|
STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj;
|
|
struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx;
|
|
|
|
struct device *current_dev=NULL;
|
|
|
|
#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
|
|
#define driver_for_each_device(drv, start, data, fn) \
|
|
struct list_head *ptr, *n; \
|
|
list_for_each_safe(ptr, n, &((drv)->devices)) {\
|
|
struct device *curr_dev;\
|
|
curr_dev = list_entry(ptr, struct device, driver_list);\
|
|
fn(curr_dev, data);\
|
|
}
|
|
#endif // KERNEL_2_6_9
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
while (1)
|
|
{
|
|
current_dev = NULL;
|
|
|
|
// Get the device
|
|
driver_for_each_device(&drv_ctx->driver, NULL, (void*)¤t_dev, storvsc_drv_exit_cb);
|
|
|
|
if (current_dev == NULL)
|
|
break;
|
|
|
|
// Initiate removal from the top-down
|
|
device_unregister(current_dev);
|
|
}
|
|
|
|
if (storvsc_drv_obj->Base.OnCleanup)
|
|
storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base);
|
|
|
|
vmbus_child_driver_unregister(drv_ctx);
|
|
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return;
|
|
}
|
|
|
|
/*++
|
|
|
|
Name: storvsc_probe()
|
|
|
|
Desc: Add a new device for this driver
|
|
|
|
--*/
|
|
static int storvsc_probe(struct device *device)
|
|
{
|
|
int ret=0;
|
|
|
|
struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
|
|
struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx;
|
|
STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj;
|
|
|
|
struct device_context *device_ctx = device_to_device_context(device);
|
|
DEVICE_OBJECT* device_obj = &device_ctx->device_obj;
|
|
|
|
struct Scsi_Host *host;
|
|
struct host_device_context *host_device_ctx;
|
|
STORVSC_DEVICE_INFO device_info;
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
if (!storvsc_drv_obj->Base.OnDeviceAdd)
|
|
return -1;
|
|
|
|
host = scsi_host_alloc(&scsi_driver, sizeof(struct host_device_context));
|
|
if (!host)
|
|
{
|
|
DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
device->driver_data = host;
|
|
|
|
host_device_ctx = (struct host_device_context*)host->hostdata;
|
|
memset(host_device_ctx, 0, sizeof(struct host_device_context));
|
|
|
|
host_device_ctx->port = host->host_no;
|
|
host_device_ctx->device_ctx = device_ctx;
|
|
|
|
#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
|
|
#elif defined(KERNEL_2_6_27)
|
|
INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback);
|
|
#else
|
|
INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback, device_obj);
|
|
#endif
|
|
|
|
#if defined(KERNEL_2_6_27)
|
|
host_device_ctx->request_pool =
|
|
kmem_cache_create
|
|
(dev_name(&device_ctx->device),
|
|
sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize,
|
|
0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
#else
|
|
host_device_ctx->request_pool =
|
|
kmem_cache_create
|
|
(device_ctx->device.bus_id,
|
|
sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize,
|
|
0,
|
|
SLAB_HWCACHE_ALIGN, NULL, NULL);
|
|
#endif
|
|
|
|
if (!host_device_ctx->request_pool)
|
|
{
|
|
scsi_host_put(host);
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
device_info.PortNumber = host->host_no;
|
|
// Call to the vsc driver to add the device
|
|
ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info);
|
|
if (ret != 0)
|
|
{
|
|
DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device");
|
|
kmem_cache_destroy(host_device_ctx->request_pool);
|
|
scsi_host_put(host);
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return -1;
|
|
}
|
|
|
|
//host_device_ctx->port = device_info.PortNumber;
|
|
host_device_ctx->path = device_info.PathId;
|
|
host_device_ctx->target = device_info.TargetId;
|
|
|
|
host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; // max # of devices per target
|
|
host->max_id = STORVSC_MAX_TARGETS; // max # of targets per channel
|
|
host->max_channel = STORVSC_MAX_CHANNELS -1; // max # of channels
|
|
|
|
// Register the HBA and start the scsi bus scan
|
|
ret = scsi_add_host(host, device);
|
|
if (ret != 0)
|
|
{
|
|
DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device");
|
|
|
|
storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
|
|
|
|
kmem_cache_destroy(host_device_ctx->request_pool);
|
|
scsi_host_put(host);
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return -1;
|
|
}
|
|
|
|
scsi_scan_host(host);
|
|
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*++
|
|
|
|
Name: storvsc_remove()
|
|
|
|
Desc: Callback when our device is removed
|
|
|
|
--*/
|
|
static int storvsc_remove(struct device *device)
|
|
{
|
|
int ret=0;
|
|
|
|
struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
|
|
struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx;
|
|
STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj;
|
|
|
|
struct device_context *device_ctx = device_to_device_context(device);
|
|
DEVICE_OBJECT* device_obj = &device_ctx->device_obj;
|
|
|
|
struct Scsi_Host *host = (struct Scsi_Host *)device->driver_data;
|
|
struct host_device_context *host_device_ctx=(struct host_device_context*)host->hostdata;
|
|
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
if (!storvsc_drv_obj->Base.OnDeviceRemove)
|
|
{
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
return -1;
|
|
}
|
|
|
|
// Call to the vsc driver to let it know that the device is being removed
|
|
ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
|
|
if (ret != 0)
|
|
{
|
|
// TODO:
|
|
DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", ret);
|
|
}
|
|
|
|
if (host_device_ctx->request_pool)
|
|
{
|
|
kmem_cache_destroy(host_device_ctx->request_pool);
|
|
host_device_ctx->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);
|
|
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*++
|
|
|
|
Name: storvsc_commmand_completion()
|
|
|
|
Desc: Command completion processing
|
|
|
|
--*/
|
|
static void storvsc_commmand_completion(STORVSC_REQUEST* request)
|
|
{
|
|
struct storvsc_cmd_request *cmd_request = (struct storvsc_cmd_request*)request->Context;
|
|
struct scsi_cmnd *scmnd = cmd_request->cmd;
|
|
struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata;
|
|
void (*scsi_done_fn)(struct scsi_cmnd *);
|
|
#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
|
|
#else
|
|
struct scsi_sense_hdr sense_hdr;
|
|
#endif
|
|
|
|
ASSERT(request == &cmd_request->request);
|
|
ASSERT((unsigned long)scmnd->host_scribble == (unsigned long)cmd_request);
|
|
ASSERT(scmnd);
|
|
ASSERT(scmnd->scsi_done);
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
if (cmd_request->bounce_sgl_count)// using bounce buffer
|
|
{
|
|
//printk("copy_from_bounce_buffer\n");
|
|
|
|
// FIXME: We can optimize on writes by just skipping this
|
|
#ifdef KERNEL_2_6_27
|
|
copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd));
|
|
#else
|
|
copy_from_bounce_buffer(scmnd->request_buffer, cmd_request->bounce_sgl, scmnd->use_sg);
|
|
#endif
|
|
destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count);
|
|
}
|
|
|
|
scmnd->result = request->Status;
|
|
|
|
if (scmnd->result)
|
|
{
|
|
#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
|
|
DPRINT_INFO(STORVSC_DRV, "scsi result nonzero - %d", scmnd->result);
|
|
#else
|
|
if (scsi_normalize_sense(scmnd->sense_buffer, request->SenseBufferSize, &sense_hdr))
|
|
{
|
|
scsi_print_sense_hdr("storvsc", &sense_hdr);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
ASSERT(request->BytesXfer <= request->DataBuffer.Length);
|
|
#ifdef KERNEL_2_6_27
|
|
scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer);
|
|
#else
|
|
scmnd->resid = request->DataBuffer.Length - request->BytesXfer;
|
|
#endif
|
|
|
|
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_device_ctx->request_pool, cmd_request);
|
|
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
}
|
|
|
|
static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
|
|
{
|
|
int i=0;
|
|
|
|
// 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=0;
|
|
struct scatterlist* bounce_sgl;
|
|
struct page *page_buf;
|
|
|
|
num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT;
|
|
|
|
bounce_sgl = kzalloc(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;
|
|
}
|
|
#ifdef KERNEL_2_6_27
|
|
sg_set_page(&bounce_sgl[i], page_buf, 0, 0);
|
|
#else
|
|
bounce_sgl[i].page = page_buf;
|
|
bounce_sgl[i].offset = 0;
|
|
bounce_sgl[i].length = 0;
|
|
#endif
|
|
}
|
|
|
|
return bounce_sgl;
|
|
|
|
cleanup:
|
|
destroy_bounce_buffer(bounce_sgl, num_pages);
|
|
return NULL;
|
|
}
|
|
|
|
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++)
|
|
{
|
|
#ifdef KERNEL_2_6_27
|
|
if ((page_buf = sg_page((&sgl[i]))) != NULL)
|
|
#else
|
|
if ((page_buf = sgl[i].page) != NULL)
|
|
#endif
|
|
|
|
{
|
|
__free_page(page_buf);
|
|
}
|
|
}
|
|
|
|
kfree(sgl);
|
|
}
|
|
|
|
// 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=0,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++)
|
|
{
|
|
#ifdef KERNEL_2_6_27
|
|
src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset;
|
|
#else
|
|
src_addr = (unsigned long)kmap_atomic(orig_sgl[i].page, KM_IRQ0) + orig_sgl[i].offset;
|
|
#endif
|
|
src = src_addr;
|
|
srclen = orig_sgl[i].length;
|
|
|
|
//if (PageHighMem(orig_sgl[i].page))
|
|
// printk("HighMem page detected - addr %p", (void*)src);
|
|
|
|
ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE);
|
|
|
|
if (j == 0)
|
|
{
|
|
#ifdef KERNEL_2_6_27
|
|
bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
|
|
#else
|
|
bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0);
|
|
#endif
|
|
}
|
|
|
|
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)
|
|
{
|
|
#ifdef KERNEL_2_6_27
|
|
bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
|
|
#else
|
|
bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0);
|
|
#endif
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
|
|
// 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=0,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++)
|
|
{
|
|
#ifdef KERNEL_2_6_27
|
|
dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset;
|
|
#else
|
|
dest_addr = (unsigned long)kmap_atomic(orig_sgl[i].page, KM_IRQ0) + orig_sgl[i].offset;
|
|
#endif
|
|
dest = dest_addr;
|
|
destlen = orig_sgl[i].length;
|
|
ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE);
|
|
|
|
if (j == 0)
|
|
{
|
|
#ifdef KERNEL_2_6_27
|
|
bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
|
|
#else
|
|
bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0);
|
|
#endif
|
|
}
|
|
|
|
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)
|
|
{
|
|
#ifdef KERNEL_2_6_27
|
|
bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
|
|
#else
|
|
bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0);
|
|
#endif
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
|
|
|
|
/*++
|
|
|
|
Name: storvsc_queuecommand()
|
|
|
|
Desc: Initiate command processing
|
|
|
|
--*/
|
|
static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *))
|
|
{
|
|
int ret=0;
|
|
struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata;
|
|
struct device_context *device_ctx=host_device_ctx->device_ctx;
|
|
struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver);
|
|
struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx;
|
|
STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj;
|
|
|
|
STORVSC_REQUEST *request;
|
|
struct storvsc_cmd_request *cmd_request;
|
|
unsigned int request_size=0;
|
|
int i;
|
|
struct scatterlist *sgl;
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
#ifdef KERNEL_2_6_27
|
|
DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d",
|
|
scmnd,
|
|
scmnd->sc_data_direction,
|
|
scsi_sg_count(scmnd),
|
|
scsi_sglist(scmnd),
|
|
scsi_bufflen(scmnd),
|
|
scmnd->device->queue_depth,
|
|
scmnd->device->tagged_supported);
|
|
#else
|
|
DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d",
|
|
scmnd,
|
|
scmnd->sc_data_direction,
|
|
scmnd->use_sg,
|
|
scmnd->request_buffer,
|
|
scmnd->request_bufflen,
|
|
scmnd->device->queue_depth,
|
|
scmnd->device->tagged_supported);
|
|
#endif
|
|
|
|
// If retrying, no need to prep the cmd
|
|
if (scmnd->host_scribble)
|
|
{
|
|
ASSERT(scmnd->scsi_done != NULL);
|
|
|
|
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;
|
|
}
|
|
|
|
ASSERT(scmnd->scsi_done == NULL);
|
|
ASSERT(scmnd->host_scribble == NULL);
|
|
|
|
scmnd->scsi_done = done;
|
|
|
|
request_size = sizeof(struct storvsc_cmd_request);
|
|
|
|
cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, GFP_ATOMIC);
|
|
if (!cmd_request)
|
|
{
|
|
DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate storvsc_cmd_request...marking queue busy", scmnd);
|
|
|
|
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;
|
|
|
|
request->Extension = (void*)((unsigned long)cmd_request + request_size);
|
|
DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, storvsc_drv_obj->RequestExtSize);
|
|
|
|
// Build the SRB
|
|
switch(scmnd->sc_data_direction)
|
|
{
|
|
case DMA_TO_DEVICE:
|
|
request->Type = WRITE_TYPE;
|
|
break;
|
|
case DMA_FROM_DEVICE:
|
|
request->Type = READ_TYPE;
|
|
break;
|
|
default:
|
|
request->Type = UNKNOWN_TYPE;
|
|
break;
|
|
}
|
|
|
|
request->OnIOCompletion = storvsc_commmand_completion;
|
|
request->Context = cmd_request;//scmnd;
|
|
|
|
//request->PortId = scmnd->device->channel;
|
|
request->Host = host_device_ctx->port;
|
|
request->Bus = scmnd->device->channel;
|
|
request->TargetId = scmnd->device->id;
|
|
request->LunId = scmnd->device->lun;
|
|
|
|
ASSERT(scmnd->cmd_len <= 16);
|
|
request->CdbLen = scmnd->cmd_len;
|
|
request->Cdb = scmnd->cmnd;
|
|
|
|
request->SenseBuffer = scmnd->sense_buffer;
|
|
request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE;
|
|
|
|
|
|
#ifdef KERNEL_2_6_27
|
|
request->DataBuffer.Length = scsi_bufflen(scmnd);
|
|
if (scsi_sg_count(scmnd))
|
|
#else
|
|
request->DataBuffer.Length = scmnd->request_bufflen;
|
|
if (scmnd->use_sg)
|
|
#endif
|
|
{
|
|
#ifdef KERNEL_2_6_27
|
|
sgl = (struct scatterlist*)scsi_sglist(scmnd);
|
|
#else
|
|
sgl = (struct scatterlist*)(scmnd->request_buffer);
|
|
#endif
|
|
|
|
// check if we need to bounce the sgl
|
|
#ifdef KERNEL_2_6_27
|
|
if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1)
|
|
#else
|
|
if (do_bounce_buffer(sgl, scmnd->use_sg) != -1)
|
|
#endif
|
|
{
|
|
DPRINT_INFO(STORVSC_DRV, "need to bounce buffer for this scmnd %p", scmnd);
|
|
#ifdef KERNEL_2_6_27
|
|
cmd_request->bounce_sgl = create_bounce_buffer(sgl, scsi_sg_count(scmnd), scsi_bufflen(scmnd));
|
|
#else
|
|
cmd_request->bounce_sgl = create_bounce_buffer(
|
|
sgl,
|
|
scmnd->use_sg, scmnd->request_bufflen);
|
|
#endif
|
|
if (!cmd_request->bounce_sgl)
|
|
{
|
|
DPRINT_ERR(STORVSC_DRV, "unable to create bounce buffer for this scmnd %p", scmnd);
|
|
|
|
scmnd->scsi_done = NULL;
|
|
scmnd->host_scribble = NULL;
|
|
kmem_cache_free(host_device_ctx->request_pool, cmd_request);
|
|
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
}
|
|
|
|
#ifdef KERNEL_2_6_27
|
|
cmd_request->bounce_sgl_count = ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> PAGE_SHIFT;
|
|
#else
|
|
cmd_request->bounce_sgl_count = ALIGN_UP(scmnd->request_bufflen, PAGE_SIZE) >> PAGE_SHIFT;
|
|
#endif
|
|
|
|
//printk("bouncing buffer allocated %p original buffer %p\n", bounce_sgl, sgl);
|
|
//printk("copy_to_bounce_buffer\n");
|
|
// FIXME: We can optimize on reads by just skipping this
|
|
#ifdef KERNEL_2_6_27
|
|
copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scsi_sg_count(scmnd));
|
|
#else
|
|
copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scmnd->use_sg);
|
|
#endif
|
|
|
|
sgl = cmd_request->bounce_sgl;
|
|
}
|
|
|
|
request->DataBuffer.Offset = sgl[0].offset;
|
|
|
|
#ifdef KERNEL_2_6_27
|
|
for (i = 0; i < scsi_sg_count(scmnd); i++ )
|
|
#else
|
|
for (i = 0; i < scmnd->use_sg; i++ )
|
|
#endif
|
|
{
|
|
DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d \n", i, sgl[i].length, sgl[i].offset);
|
|
#ifdef KERNEL_2_6_27
|
|
request->DataBuffer.PfnArray[i] = page_to_pfn(sg_page((&sgl[i])));
|
|
#else
|
|
request->DataBuffer.PfnArray[i] = page_to_pfn(sgl[i].page);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#ifdef KERNEL_2_6_27
|
|
else if (scsi_sglist(scmnd))
|
|
{
|
|
ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE);
|
|
request->DataBuffer.Offset = virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
|
|
request->DataBuffer.PfnArray[0] = virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
|
|
}
|
|
else
|
|
{
|
|
ASSERT(scsi_bufflen(scmnd) == 0);
|
|
}
|
|
#else
|
|
else if (scmnd->request_buffer)
|
|
{
|
|
ASSERT(scmnd->request_bufflen <= PAGE_SIZE);
|
|
request->DataBuffer.Offset = virt_to_phys(scmnd->request_buffer) & (PAGE_SIZE-1);
|
|
request->DataBuffer.PfnArray[0] = virt_to_phys(scmnd->request_buffer) >> PAGE_SHIFT;
|
|
}
|
|
else
|
|
{
|
|
ASSERT(scmnd->request_bufflen == 0);
|
|
}
|
|
#endif
|
|
|
|
retry_request:
|
|
|
|
// Invokes the vsc to start an IO
|
|
ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, &cmd_request->request);
|
|
if (ret == -1) // no more space
|
|
{
|
|
DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - queue FULL...marking queue busy", scmnd);
|
|
|
|
if (cmd_request->bounce_sgl_count)
|
|
{
|
|
// FIXME: We can optimize on writes by just skipping this
|
|
#ifdef KERNEL_2_6_27
|
|
copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd));
|
|
#else
|
|
copy_from_bounce_buffer(
|
|
scmnd->request_buffer,
|
|
cmd_request->bounce_sgl,
|
|
scmnd->use_sg);
|
|
#endif
|
|
destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count);
|
|
}
|
|
|
|
kmem_cache_free(host_device_ctx->request_pool, cmd_request);
|
|
|
|
scmnd->scsi_done = NULL;
|
|
scmnd->host_scribble = NULL;
|
|
|
|
ret = SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef KERNEL_2_6_27
|
|
static int storvsc_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, struct bio_vec *bvec)
|
|
{
|
|
return bvec->bv_len; //checking done by caller.
|
|
}
|
|
#else
|
|
static int storvsc_merge_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *bvec)
|
|
{
|
|
// Check if we are adding a new bvec
|
|
if (bio->bi_vcnt > 0)
|
|
{
|
|
//printk("storvsc_merge_bvec() - cnt %u offset %u len %u\n", bio->bi_vcnt, bvec->bv_offset, bvec->bv_len);
|
|
|
|
struct bio_vec *prev = &bio->bi_io_vec[bio->bi_vcnt - 1];
|
|
if (bvec == prev)
|
|
return bvec->bv_len; // success
|
|
|
|
// Adding new bvec. Make sure the prev one is a complete page
|
|
if (prev->bv_len == PAGE_SIZE && prev->bv_offset == 0)
|
|
{
|
|
return bvec->bv_len; // success
|
|
}
|
|
else
|
|
{
|
|
// Dont reject if the new bvec starts off from the prev one since
|
|
// they will be merge into 1 bvec or blk_rq_map_sg() will merge them into 1 sg element
|
|
if ((bvec->bv_page == prev->bv_page) &&
|
|
(bvec->bv_offset == prev->bv_offset + prev->bv_len))
|
|
{
|
|
return bvec->bv_len; // success
|
|
}
|
|
else
|
|
{
|
|
DPRINT_INFO(STORVSC_DRV, "detected holes in bio request (%p) - cnt %u offset %u len %u", bio, bio->bi_vcnt, bvec->bv_offset, bvec->bv_len);
|
|
return 0; // dont add the bvec to this bio since we dont allow holes in the middle of a multi-pages bio
|
|
}
|
|
}
|
|
}
|
|
|
|
return bvec->bv_len; // success
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
/*++
|
|
|
|
Name: storvsc_device_configure()
|
|
|
|
Desc: Configure the specified scsi device
|
|
|
|
--*/
|
|
static int storvsc_device_alloc(struct scsi_device *sdevice)
|
|
{
|
|
#ifdef KERNEL_2_6_5
|
|
#else
|
|
DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", sdevice, BLIST_SPARSELUN);
|
|
// This enables luns to be located sparsely. Otherwise, we may not discovered them.
|
|
sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int storvsc_device_configure(struct scsi_device *sdevice)
|
|
{
|
|
DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, sdevice->queue_depth);
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", sdevice, STORVSC_MAX_IO_REQUESTS);
|
|
scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, STORVSC_MAX_IO_REQUESTS);
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %d", 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);
|
|
//sdevice->timeout = (2000 * HZ);//(75 * HZ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*++
|
|
|
|
Name: storvsc_host_reset_handler()
|
|
|
|
Desc: Reset the scsi HBA
|
|
|
|
--*/
|
|
static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
|
|
{
|
|
int ret=SUCCESS;
|
|
struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata;
|
|
struct device_context *device_ctx = host_device_ctx->device_ctx;
|
|
struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver);
|
|
struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx;
|
|
|
|
STORVSC_DRIVER_OBJECT *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj;
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", scmnd->device, &device_ctx->device_obj);
|
|
|
|
// Invokes the vsc to reset the host/bus
|
|
ASSERT(storvsc_drv_obj->OnHostReset);
|
|
ret = storvsc_drv_obj->OnHostReset(&device_ctx->device_obj);
|
|
if (ret != 0)
|
|
{
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
return ret;
|
|
}
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", scmnd->device, &device_ctx->device_obj);
|
|
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*++
|
|
|
|
Name: storvsc_host_rescan
|
|
|
|
Desc: Rescan the scsi HBA
|
|
|
|
--*/
|
|
#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
|
|
#else
|
|
|
|
#ifdef KERNEL_2_6_27
|
|
static void storvsc_host_rescan_callback(struct work_struct *work)
|
|
{
|
|
DEVICE_OBJECT* device_obj =
|
|
&((struct host_device_context*)work)->device_ctx->device_obj;
|
|
#else
|
|
static void storvsc_host_rescan_callback(void* context)
|
|
{
|
|
|
|
DEVICE_OBJECT* device_obj = (DEVICE_OBJECT*)context;
|
|
#endif
|
|
struct device_context* device_ctx = to_device_context(device_obj);
|
|
struct Scsi_Host *host = (struct Scsi_Host *)device_ctx->device.driver_data;
|
|
struct scsi_device *sdev;
|
|
struct host_device_context *host_device_ctx;
|
|
struct scsi_device **sdevs_remove_list;
|
|
unsigned int sdevs_count=0;
|
|
unsigned int found;
|
|
unsigned int i;
|
|
unsigned int lun_count=0;
|
|
unsigned int *lun_list;
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
host_device_ctx = (struct host_device_context*)host->hostdata;
|
|
lun_list = kzalloc(sizeof(unsigned int)*STORVSC_MAX_LUNS_PER_TARGET, GFP_ATOMIC);
|
|
if (!lun_list)
|
|
{
|
|
DPRINT_ERR(STORVSC_DRV, "unable to allocate lun list");
|
|
return;
|
|
}
|
|
|
|
sdevs_remove_list = kzalloc(sizeof(void*)*STORVSC_MAX_LUNS_PER_TARGET, GFP_ATOMIC);
|
|
if (!sdevs_remove_list)
|
|
{
|
|
kfree(lun_list);
|
|
DPRINT_ERR(STORVSC_DRV, "unable to allocate lun remove list");
|
|
return;
|
|
}
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "rescanning host for new scsi devices...", device_obj, host_device_ctx->target, host_device_ctx->path);
|
|
|
|
// Rescan for new device
|
|
scsi_scan_target(&host->shost_gendev, host_device_ctx->path, host_device_ctx->target, SCAN_WILD_CARD, 1);
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "rescanning host for removed scsi device...");
|
|
|
|
// Use the 1st device to send the report luns cmd
|
|
shost_for_each_device(sdev, host)
|
|
{
|
|
lun_count=STORVSC_MAX_LUNS_PER_TARGET;
|
|
storvsc_report_luns(sdev, lun_list, &lun_count);
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, lun_count);
|
|
DPRINT_INFO(STORVSC_DRV, "existing luns on scsi device (%p) host (%d)", sdev, host->host_no);
|
|
|
|
scsi_device_put(sdev);
|
|
break;
|
|
}
|
|
|
|
for (i=0; i<lun_count; i++)
|
|
{
|
|
DPRINT_INFO(STORVSC_DRV, "%d) lun %u", i, lun_list[i]);
|
|
}
|
|
|
|
// Rescan for devices that may have been removed.
|
|
// We do not have to worry that new devices may have been added since
|
|
// this callback is serialized by the workqueue ie add/remove are done here.
|
|
shost_for_each_device(sdev, host)
|
|
{
|
|
// See if this device is still here
|
|
found = 0;
|
|
for (i=0; i<lun_count; i++)
|
|
{
|
|
if (sdev->lun == lun_list[i])
|
|
{
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found)
|
|
{
|
|
DPRINT_INFO(STORVSC_DRV, "lun (%u) does not exists", sdev->lun);
|
|
sdevs_remove_list[sdevs_count++] = sdev;
|
|
}
|
|
}
|
|
|
|
// Now remove the devices
|
|
for (i=0; i< sdevs_count; i++)
|
|
{
|
|
DPRINT_INFO(STORVSC_DRV, "removing scsi device (%p) lun (%u)...",
|
|
sdevs_remove_list[i], sdevs_remove_list[i]->lun);
|
|
|
|
// make sure it is not removed from underneath us
|
|
if (!scsi_device_get(sdevs_remove_list[i]))
|
|
{
|
|
scsi_remove_device(sdevs_remove_list[i]);
|
|
scsi_device_put(sdevs_remove_list[i]);
|
|
}
|
|
}
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "rescan completed on dev obj (%p) target (%u) bus (%u)", device_obj, host_device_ctx->target, host_device_ctx->path);
|
|
|
|
kfree(lun_list);
|
|
kfree(sdevs_remove_list);
|
|
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
}
|
|
|
|
static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count)
|
|
{
|
|
int i,j;
|
|
unsigned int lun=0;
|
|
unsigned int num_luns;
|
|
int result;
|
|
unsigned char *data;
|
|
#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
|
|
#else
|
|
struct scsi_sense_hdr sshdr;
|
|
#endif
|
|
unsigned char cmd[16]={0};
|
|
unsigned int report_len = 8*(STORVSC_MAX_LUNS_PER_TARGET+1); // Add 1 to cover the report_lun header
|
|
unsigned long long *report_luns;
|
|
const unsigned int in_lun_count = *lun_count;
|
|
|
|
*lun_count = 0;
|
|
|
|
report_luns = kzalloc(report_len, GFP_ATOMIC);
|
|
if (!report_luns)
|
|
{
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cmd[0] = REPORT_LUNS;
|
|
|
|
// cmd length
|
|
*(unsigned int*)&cmd[6] = cpu_to_be32(report_len);
|
|
|
|
result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, (unsigned char*)report_luns, report_len, &sshdr, 30*HZ, 3, NULL);
|
|
if (result != 0)
|
|
{
|
|
kfree(report_luns);
|
|
return -EBUSY;
|
|
}
|
|
|
|
// get the length from the first four bytes
|
|
report_len = be32_to_cpu(*(unsigned int*)&report_luns[0]);
|
|
|
|
num_luns = (report_len / sizeof(unsigned long long));
|
|
if (num_luns > in_lun_count)
|
|
{
|
|
kfree(report_luns);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*lun_count = num_luns;
|
|
|
|
DPRINT_DBG(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, num_luns);
|
|
|
|
// lun id starts at 1
|
|
for (i=1; i< num_luns+1; i++)
|
|
{
|
|
lun = 0;
|
|
data = (unsigned char*)&report_luns[i];
|
|
for (j = 0; j < sizeof(lun); j += 2)
|
|
{
|
|
lun = lun | (((data[j] << 8) | data[j + 1]) << (j * 8));
|
|
}
|
|
|
|
luns[i-1] = lun;
|
|
}
|
|
|
|
kfree(report_luns);
|
|
return 0;
|
|
}
|
|
#endif // KERNEL_2_6_9
|
|
|
|
static void storvsc_host_rescan(DEVICE_OBJECT* device_obj)
|
|
{
|
|
struct device_context* device_ctx = to_device_context(device_obj);
|
|
struct Scsi_Host *host = (struct Scsi_Host *)device_ctx->device.driver_data;
|
|
struct host_device_context *host_device_ctx;
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
|
|
DPRINT_ERR(STORVSC_DRV, "rescan not supported on 2.6.9 kernels!! You will need to reboot if you have added or removed the scsi lun device");
|
|
#else
|
|
|
|
host_device_ctx = (struct host_device_context*)host->hostdata;
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "initiating rescan on dev obj (%p) target (%u) bus (%u)...", device_obj, host_device_ctx->target, host_device_ctx->path);
|
|
|
|
// We need to queue this since the scanning may block and the caller may be in an intr context
|
|
//scsi_queue_work(host, &host_device_ctx->host_rescan_work);
|
|
schedule_work(&host_device_ctx->host_rescan_work);
|
|
#endif // KERNEL_2_6_9
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
}
|
|
|
|
static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info)
|
|
{
|
|
sector_t total_sectors = capacity;
|
|
sector_t cylinder_times_heads=0;
|
|
sector_t temp=0;
|
|
|
|
int sectors_per_track=0;
|
|
int heads=0;
|
|
int cylinders=0;
|
|
int rem=0;
|
|
|
|
if (total_sectors > (65535 * 16 * 255)) {
|
|
total_sectors = (65535 * 16 * 255);
|
|
}
|
|
|
|
if (total_sectors >= (65535 * 16 * 63)) {
|
|
sectors_per_track = 255;
|
|
heads = 16;
|
|
|
|
cylinder_times_heads = total_sectors;
|
|
rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
|
|
}
|
|
else
|
|
{
|
|
sectors_per_track = 17;
|
|
|
|
cylinder_times_heads = total_sectors;
|
|
rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
|
|
|
|
temp = cylinder_times_heads + 1023;
|
|
rem = sector_div(temp, 1024); // sector_div stores the quotient in temp
|
|
|
|
heads = temp;
|
|
|
|
if (heads < 4) {
|
|
heads = 4;
|
|
}
|
|
|
|
if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) {
|
|
sectors_per_track = 31;
|
|
heads = 16;
|
|
|
|
cylinder_times_heads = total_sectors;
|
|
rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
|
|
}
|
|
|
|
if (cylinder_times_heads >= (heads * 1024)) {
|
|
sectors_per_track = 63;
|
|
heads = 16;
|
|
|
|
cylinder_times_heads = total_sectors;
|
|
rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
|
|
}
|
|
}
|
|
|
|
temp = cylinder_times_heads;
|
|
rem = sector_div(temp, heads); // sector_div stores the quotient in temp
|
|
cylinders = temp;
|
|
|
|
info[0] = heads;
|
|
info[1] = sectors_per_track;
|
|
info[2] = cylinders;
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, sectors_per_track);
|
|
|
|
return 0;
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init storvsc_init(void)
|
|
{
|
|
int ret;
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "Storvsc initializing....");
|
|
|
|
ret = storvsc_drv_init(StorVscInitialize);
|
|
|
|
DPRINT_EXIT(STORVSC_DRV);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit storvsc_exit(void)
|
|
{
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
|
|
storvsc_drv_exit();
|
|
|
|
DPRINT_ENTER(STORVSC_DRV);
|
|
}
|
|
|
|
module_param(storvsc_ringbuffer_size, int, S_IRUGO);
|
|
|
|
module_init(storvsc_init);
|
|
module_exit(storvsc_exit);
|
|
|
|
// eof
|