2 * Copyright (c) 2009, Microsoft Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 * K. Y. Srinivasan <kys@microsoft.com>
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/device.h>
26 #include <linux/blkdev.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_cmnd.h>
29 #include <scsi/scsi_host.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_tcq.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_devinfo.h>
34 #include <scsi/scsi_dbg.h>
37 #include "version_info.h"
39 #include "storvsc_api.h"
44 static const char *driver_name
= "storvsc";
46 /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
47 static const struct hv_guid gStorVscDeviceType
= {
49 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
50 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
54 struct hv_host_device
{
55 struct hv_device
*dev
;
56 struct kmem_cache
*request_pool
;
62 struct storvsc_cmd_request
{
63 struct list_head entry
;
64 struct scsi_cmnd
*cmd
;
66 unsigned int bounce_sgl_count
;
67 struct scatterlist
*bounce_sgl
;
69 struct hv_storvsc_request request
;
74 * stor_vsc_initialize - Main entry point
76 static int stor_vsc_initialize(struct hv_driver
*driver
)
78 struct storvsc_driver
*stor_driver
;
80 stor_driver
= hvdr_to_stordr(driver
);
83 /* Make sure we are at least 2 pages since 1 page is used for control */
85 driver
->name
= driver_name
;
86 memcpy(&driver
->dev_type
, &gStorVscDeviceType
,
87 sizeof(struct hv_guid
));
91 * Divide the ring buffer data size (which is 1 page less
92 * than the ring buffer size since that page is reserved for
93 * the ring buffer indices) by the max request size (which is
94 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
96 stor_driver
->max_outstanding_req_per_channel
=
97 ((stor_driver
->ring_buffer_size
- PAGE_SIZE
) /
98 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET
+
99 sizeof(struct vstor_packet
) + sizeof(u64
),
102 DPRINT_INFO(STORVSC
, "max io %u, currently %u\n",
103 stor_driver
->max_outstanding_req_per_channel
,
104 STORVSC_MAX_IO_REQUESTS
);
106 /* Setup the dispatch table */
107 stor_driver
->base
.dev_add
= storvsc_dev_add
;
108 stor_driver
->base
.dev_rm
= storvsc_dev_remove
;
110 stor_driver
->on_io_request
= storvsc_do_io
;
115 static int storvsc_device_alloc(struct scsi_device
*sdevice
)
118 * This enables luns to be located sparsely. Otherwise, we may not
121 sdevice
->sdev_bflags
|= BLIST_SPARSELUN
| BLIST_LARGELUN
;
125 static int storvsc_merge_bvec(struct request_queue
*q
,
126 struct bvec_merge_data
*bmd
, struct bio_vec
*bvec
)
128 /* checking done by caller. */
132 static int storvsc_device_configure(struct scsi_device
*sdevice
)
134 scsi_adjust_queue_depth(sdevice
, MSG_SIMPLE_TAG
,
135 STORVSC_MAX_IO_REQUESTS
);
137 DPRINT_INFO(STORVSC_DRV
, "sdev (%p) - setting max segment size to %ld",
139 blk_queue_max_segment_size(sdevice
->request_queue
, PAGE_SIZE
);
141 DPRINT_INFO(STORVSC_DRV
, "sdev (%p) - adding merge bio vec routine",
143 blk_queue_merge_bvec(sdevice
->request_queue
, storvsc_merge_bvec
);
145 blk_queue_bounce_limit(sdevice
->request_queue
, BLK_BOUNCE_ANY
);
146 /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */
151 static void destroy_bounce_buffer(struct scatterlist
*sgl
,
152 unsigned int sg_count
)
155 struct page
*page_buf
;
157 for (i
= 0; i
< sg_count
; i
++) {
158 page_buf
= sg_page((&sgl
[i
]));
159 if (page_buf
!= NULL
)
160 __free_page(page_buf
);
166 static int do_bounce_buffer(struct scatterlist
*sgl
, unsigned int sg_count
)
170 /* No need to check */
174 /* We have at least 2 sg entries */
175 for (i
= 0; i
< sg_count
; i
++) {
177 /* make sure 1st one does not have hole */
178 if (sgl
[i
].offset
+ sgl
[i
].length
!= PAGE_SIZE
)
180 } else if (i
== sg_count
- 1) {
181 /* make sure last one does not have hole */
182 if (sgl
[i
].offset
!= 0)
185 /* make sure no hole in the middle */
186 if (sgl
[i
].length
!= PAGE_SIZE
|| sgl
[i
].offset
!= 0)
193 static struct scatterlist
*create_bounce_buffer(struct scatterlist
*sgl
,
194 unsigned int sg_count
,
199 struct scatterlist
*bounce_sgl
;
200 struct page
*page_buf
;
202 num_pages
= ALIGN(len
, PAGE_SIZE
) >> PAGE_SHIFT
;
204 bounce_sgl
= kcalloc(num_pages
, sizeof(struct scatterlist
), GFP_ATOMIC
);
208 for (i
= 0; i
< num_pages
; i
++) {
209 page_buf
= alloc_page(GFP_ATOMIC
);
212 sg_set_page(&bounce_sgl
[i
], page_buf
, 0, 0);
218 destroy_bounce_buffer(bounce_sgl
, num_pages
);
223 /* Assume the original sgl has enough room */
224 static unsigned int copy_from_bounce_buffer(struct scatterlist
*orig_sgl
,
225 struct scatterlist
*bounce_sgl
,
226 unsigned int orig_sgl_count
)
230 unsigned long src
, dest
;
231 unsigned int srclen
, destlen
, copylen
;
232 unsigned int total_copied
= 0;
233 unsigned long bounce_addr
= 0;
234 unsigned long dest_addr
= 0;
237 local_irq_save(flags
);
239 for (i
= 0; i
< orig_sgl_count
; i
++) {
240 dest_addr
= (unsigned long)kmap_atomic(sg_page((&orig_sgl
[i
])),
241 KM_IRQ0
) + orig_sgl
[i
].offset
;
243 destlen
= orig_sgl
[i
].length
;
245 if (bounce_addr
== 0)
247 (unsigned long)kmap_atomic(sg_page((&bounce_sgl
[j
])),
251 src
= bounce_addr
+ bounce_sgl
[j
].offset
;
252 srclen
= bounce_sgl
[j
].length
- bounce_sgl
[j
].offset
;
254 copylen
= min(srclen
, destlen
);
255 memcpy((void *)dest
, (void *)src
, copylen
);
257 total_copied
+= copylen
;
258 bounce_sgl
[j
].offset
+= copylen
;
262 if (bounce_sgl
[j
].offset
== bounce_sgl
[j
].length
) {
264 kunmap_atomic((void *)bounce_addr
, KM_IRQ0
);
267 /* if we need to use another bounce buffer */
268 if (destlen
|| i
!= orig_sgl_count
- 1)
270 (unsigned long)kmap_atomic(
271 sg_page((&bounce_sgl
[j
])), KM_IRQ0
);
272 } else if (destlen
== 0 && i
== orig_sgl_count
- 1) {
273 /* unmap the last bounce that is < PAGE_SIZE */
274 kunmap_atomic((void *)bounce_addr
, KM_IRQ0
);
278 kunmap_atomic((void *)(dest_addr
- orig_sgl
[i
].offset
),
282 local_irq_restore(flags
);
288 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
289 static unsigned int copy_to_bounce_buffer(struct scatterlist
*orig_sgl
,
290 struct scatterlist
*bounce_sgl
,
291 unsigned int orig_sgl_count
)
295 unsigned long src
, dest
;
296 unsigned int srclen
, destlen
, copylen
;
297 unsigned int total_copied
= 0;
298 unsigned long bounce_addr
= 0;
299 unsigned long src_addr
= 0;
302 local_irq_save(flags
);
304 for (i
= 0; i
< orig_sgl_count
; i
++) {
305 src_addr
= (unsigned long)kmap_atomic(sg_page((&orig_sgl
[i
])),
306 KM_IRQ0
) + orig_sgl
[i
].offset
;
308 srclen
= orig_sgl
[i
].length
;
310 if (bounce_addr
== 0)
312 (unsigned long)kmap_atomic(sg_page((&bounce_sgl
[j
])),
316 /* assume bounce offset always == 0 */
317 dest
= bounce_addr
+ bounce_sgl
[j
].length
;
318 destlen
= PAGE_SIZE
- bounce_sgl
[j
].length
;
320 copylen
= min(srclen
, destlen
);
321 memcpy((void *)dest
, (void *)src
, copylen
);
323 total_copied
+= copylen
;
324 bounce_sgl
[j
].length
+= copylen
;
328 if (bounce_sgl
[j
].length
== PAGE_SIZE
) {
329 /* full..move to next entry */
330 kunmap_atomic((void *)bounce_addr
, KM_IRQ0
);
333 /* if we need to use another bounce buffer */
334 if (srclen
|| i
!= orig_sgl_count
- 1)
336 (unsigned long)kmap_atomic(
337 sg_page((&bounce_sgl
[j
])), KM_IRQ0
);
339 } else if (srclen
== 0 && i
== orig_sgl_count
- 1) {
340 /* unmap the last bounce that is < PAGE_SIZE */
341 kunmap_atomic((void *)bounce_addr
, KM_IRQ0
);
345 kunmap_atomic((void *)(src_addr
- orig_sgl
[i
].offset
), KM_IRQ0
);
348 local_irq_restore(flags
);
355 * storvsc_remove - Callback when our device is removed
357 static int storvsc_remove(struct hv_device
*dev
)
359 struct storvsc_driver
*storvsc_drv_obj
=
360 drv_to_stordrv(dev
->device
.driver
);
361 struct Scsi_Host
*host
= dev_get_drvdata(&dev
->device
);
362 struct hv_host_device
*host_dev
=
363 (struct hv_host_device
*)host
->hostdata
;
366 * Call to the vsc driver to let it know that the device is being
369 storvsc_drv_obj
->base
.dev_rm(dev
);
371 if (host_dev
->request_pool
) {
372 kmem_cache_destroy(host_dev
->request_pool
);
373 host_dev
->request_pool
= NULL
;
376 DPRINT_INFO(STORVSC
, "removing host adapter (%p)...", host
);
377 scsi_remove_host(host
);
379 DPRINT_INFO(STORVSC
, "releasing host adapter (%p)...", host
);
385 static int storvsc_get_chs(struct scsi_device
*sdev
, struct block_device
* bdev
,
386 sector_t capacity
, int *info
)
388 sector_t total_sectors
= capacity
;
389 sector_t cylinder_times_heads
= 0;
392 int sectors_per_track
= 0;
397 if (total_sectors
> (65535 * 16 * 255))
398 total_sectors
= (65535 * 16 * 255);
400 if (total_sectors
>= (65535 * 16 * 63)) {
401 sectors_per_track
= 255;
404 cylinder_times_heads
= total_sectors
;
405 /* sector_div stores the quotient in cylinder_times_heads */
406 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
408 sectors_per_track
= 17;
410 cylinder_times_heads
= total_sectors
;
411 /* sector_div stores the quotient in cylinder_times_heads */
412 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
414 temp
= cylinder_times_heads
+ 1023;
415 /* sector_div stores the quotient in temp */
416 rem
= sector_div(temp
, 1024);
423 if (cylinder_times_heads
>= (heads
* 1024) || (heads
> 16)) {
424 sectors_per_track
= 31;
427 cylinder_times_heads
= total_sectors
;
429 * sector_div stores the quotient in
430 * cylinder_times_heads
432 rem
= sector_div(cylinder_times_heads
,
436 if (cylinder_times_heads
>= (heads
* 1024)) {
437 sectors_per_track
= 63;
440 cylinder_times_heads
= total_sectors
;
442 * sector_div stores the quotient in
443 * cylinder_times_heads
445 rem
= sector_div(cylinder_times_heads
,
450 temp
= cylinder_times_heads
;
451 /* sector_div stores the quotient in temp */
452 rem
= sector_div(temp
, heads
);
456 info
[1] = sectors_per_track
;
459 DPRINT_INFO(STORVSC_DRV
, "CHS (%d, %d, %d)", cylinders
, heads
,
465 static int storvsc_probe(struct hv_device
*dev
);
466 static int storvsc_queuecommand(struct Scsi_Host
*shost
, struct scsi_cmnd
*scmnd
);
467 static int storvsc_host_reset_handler(struct scsi_cmnd
*scmnd
);
469 static int storvsc_ringbuffer_size
= STORVSC_RING_BUFFER_SIZE
;
470 module_param(storvsc_ringbuffer_size
, int, S_IRUGO
);
471 MODULE_PARM_DESC(storvsc_ringbuffer_size
, "Ring buffer size (bytes)");
473 /* The one and only one */
474 static struct storvsc_driver g_storvsc_drv
;
477 static struct scsi_host_template scsi_driver
= {
478 .module
= THIS_MODULE
,
479 .name
= "storvsc_host_t",
480 .bios_param
= storvsc_get_chs
,
481 .queuecommand
= storvsc_queuecommand
,
482 .eh_host_reset_handler
= storvsc_host_reset_handler
,
483 .slave_alloc
= storvsc_device_alloc
,
484 .slave_configure
= storvsc_device_configure
,
486 /* 64 max_queue * 1 target */
487 .can_queue
= STORVSC_MAX_IO_REQUESTS
*STORVSC_MAX_TARGETS
,
489 /* no use setting to 0 since ll_blk_rw reset it to 1 */
491 .sg_tablesize
= MAX_MULTIPAGE_BUFFER_COUNT
,
493 * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge
494 * into 1 sg element. If set, we must limit the max_segment_size to
495 * PAGE_SIZE, otherwise we may get 1 sg element that represents
498 /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */
499 .use_clustering
= ENABLE_CLUSTERING
,
500 /* Make sure we dont get a sg segment crosses a page boundary */
501 .dma_boundary
= PAGE_SIZE
-1,
506 * storvsc_drv_init - StorVsc driver initialization.
508 static int storvsc_drv_init(void)
511 struct storvsc_driver
*storvsc_drv_obj
= &g_storvsc_drv
;
512 struct hv_driver
*drv
= &g_storvsc_drv
.base
;
514 storvsc_drv_obj
->ring_buffer_size
= storvsc_ringbuffer_size
;
516 /* Callback to client driver to complete the initialization */
517 stor_vsc_initialize(&storvsc_drv_obj
->base
);
519 DPRINT_INFO(STORVSC_DRV
,
520 "max outstanding reqs %u",
521 storvsc_drv_obj
->max_outstanding_req_per_channel
);
523 if (storvsc_drv_obj
->max_outstanding_req_per_channel
<
524 STORVSC_MAX_IO_REQUESTS
)
527 drv
->driver
.name
= storvsc_drv_obj
->base
.name
;
529 drv
->probe
= storvsc_probe
;
530 drv
->remove
= storvsc_remove
;
532 /* The driver belongs to vmbus */
533 ret
= vmbus_child_driver_register(&drv
->driver
);
539 static int stor_vsc_on_host_reset(struct hv_device
*device
)
541 struct storvsc_device
*stor_device
;
542 struct hv_storvsc_request
*request
;
543 struct vstor_packet
*vstor_packet
;
546 DPRINT_INFO(STORVSC
, "resetting host adapter...");
548 stor_device
= get_stor_device(device
);
552 request
= &stor_device
->reset_request
;
553 vstor_packet
= &request
->vstor_packet
;
555 init_completion(&request
->wait_event
);
557 vstor_packet
->operation
= VSTOR_OPERATION_RESET_BUS
;
558 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
559 vstor_packet
->vm_srb
.path_id
= stor_device
->path_id
;
561 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
562 sizeof(struct vstor_packet
),
563 (unsigned long)&stor_device
->reset_request
,
565 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
569 t
= wait_for_completion_timeout(&request
->wait_event
, HZ
);
575 DPRINT_INFO(STORVSC
, "host adapter reset completed");
578 * At this point, all outstanding requests in the adapter
579 * should have been flushed out and return to us
583 put_stor_device(device
);
587 static int storvsc_drv_exit_cb(struct device
*dev
, void *data
)
589 struct device
**curr
= (struct device
**)data
;
591 return 1; /* stop iterating */
594 static void storvsc_drv_exit(void)
596 struct storvsc_driver
*storvsc_drv_obj
= &g_storvsc_drv
;
597 struct hv_driver
*drv
= &g_storvsc_drv
.base
;
598 struct device
*current_dev
= NULL
;
605 ret
= driver_for_each_device(&drv
->driver
, NULL
,
606 (void *) ¤t_dev
,
607 storvsc_drv_exit_cb
);
610 if (current_dev
== NULL
)
613 /* Initiate removal from the top-down */
614 device_unregister(current_dev
);
617 if (storvsc_drv_obj
->base
.cleanup
)
618 storvsc_drv_obj
->base
.cleanup(&storvsc_drv_obj
->base
);
620 vmbus_child_driver_unregister(&drv
->driver
);
625 * storvsc_probe - Add a new device for this driver
627 static int storvsc_probe(struct hv_device
*device
)
630 struct storvsc_driver
*storvsc_drv_obj
=
631 drv_to_stordrv(device
->device
.driver
);
632 struct Scsi_Host
*host
;
633 struct hv_host_device
*host_dev
;
634 struct storvsc_device_info device_info
;
636 if (!storvsc_drv_obj
->base
.dev_add
)
639 host
= scsi_host_alloc(&scsi_driver
,
640 sizeof(struct hv_host_device
));
644 dev_set_drvdata(&device
->device
, host
);
646 host_dev
= (struct hv_host_device
*)host
->hostdata
;
647 memset(host_dev
, 0, sizeof(struct hv_host_device
));
649 host_dev
->port
= host
->host_no
;
650 host_dev
->dev
= device
;
652 host_dev
->request_pool
=
653 kmem_cache_create(dev_name(&device
->device
),
654 sizeof(struct storvsc_cmd_request
), 0,
655 SLAB_HWCACHE_ALIGN
, NULL
);
657 if (!host_dev
->request_pool
) {
662 device_info
.port_number
= host
->host_no
;
663 /* Call to the vsc driver to add the device */
664 ret
= storvsc_drv_obj
->base
.dev_add(device
, (void *)&device_info
);
667 kmem_cache_destroy(host_dev
->request_pool
);
672 host_dev
->path
= device_info
.path_id
;
673 host_dev
->target
= device_info
.target_id
;
675 /* max # of devices per target */
676 host
->max_lun
= STORVSC_MAX_LUNS_PER_TARGET
;
677 /* max # of targets per channel */
678 host
->max_id
= STORVSC_MAX_TARGETS
;
679 /* max # of channels */
680 host
->max_channel
= STORVSC_MAX_CHANNELS
- 1;
682 /* Register the HBA and start the scsi bus scan */
683 ret
= scsi_add_host(host
, &device
->device
);
686 storvsc_drv_obj
->base
.dev_rm(device
);
688 kmem_cache_destroy(host_dev
->request_pool
);
693 scsi_scan_host(host
);
698 * storvsc_commmand_completion - Command completion processing
700 static void storvsc_commmand_completion(struct hv_storvsc_request
*request
)
702 struct storvsc_cmd_request
*cmd_request
=
703 (struct storvsc_cmd_request
*)request
->context
;
704 struct scsi_cmnd
*scmnd
= cmd_request
->cmd
;
705 struct hv_host_device
*host_dev
=
706 (struct hv_host_device
*)scmnd
->device
->host
->hostdata
;
707 void (*scsi_done_fn
)(struct scsi_cmnd
*);
708 struct scsi_sense_hdr sense_hdr
;
709 struct vmscsi_request
*vm_srb
;
711 /* ASSERT(request == &cmd_request->request); */
713 /* ASSERT((unsigned long)scmnd->host_scribble == */
714 /* (unsigned long)cmd_request); */
715 /* ASSERT(scmnd->scsi_done); */
717 if (cmd_request
->bounce_sgl_count
) {
718 /* using bounce buffer */
719 /* printk("copy_from_bounce_buffer\n"); */
721 /* FIXME: We can optimize on writes by just skipping this */
722 copy_from_bounce_buffer(scsi_sglist(scmnd
),
723 cmd_request
->bounce_sgl
,
724 scsi_sg_count(scmnd
));
725 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
726 cmd_request
->bounce_sgl_count
);
729 vm_srb
= &request
->vstor_packet
.vm_srb
;
730 scmnd
->result
= vm_srb
->scsi_status
;
733 if (scsi_normalize_sense(scmnd
->sense_buffer
,
734 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
735 scsi_print_sense_hdr("storvsc", &sense_hdr
);
738 /* ASSERT(request->BytesXfer <= request->data_buffer.Length); */
739 scsi_set_resid(scmnd
,
740 request
->data_buffer
.len
-
741 vm_srb
->data_transfer_length
);
743 scsi_done_fn
= scmnd
->scsi_done
;
745 scmnd
->host_scribble
= NULL
;
746 scmnd
->scsi_done
= NULL
;
748 /* !!DO NOT MODIFY the scmnd after this call */
751 kmem_cache_free(host_dev
->request_pool
, cmd_request
);
755 * storvsc_queuecommand - Initiate command processing
757 static int storvsc_queuecommand_lck(struct scsi_cmnd
*scmnd
,
758 void (*done
)(struct scsi_cmnd
*))
761 struct hv_host_device
*host_dev
=
762 (struct hv_host_device
*)scmnd
->device
->host
->hostdata
;
763 struct hv_device
*dev
= host_dev
->dev
;
764 struct storvsc_driver
*storvsc_drv_obj
=
765 drv_to_stordrv(dev
->device
.driver
);
766 struct hv_storvsc_request
*request
;
767 struct storvsc_cmd_request
*cmd_request
;
768 unsigned int request_size
= 0;
770 struct scatterlist
*sgl
;
771 unsigned int sg_count
= 0;
772 struct vmscsi_request
*vm_srb
;
775 /* If retrying, no need to prep the cmd */
776 if (scmnd
->host_scribble
) {
777 /* ASSERT(scmnd->scsi_done != NULL); */
780 (struct storvsc_cmd_request
*)scmnd
->host_scribble
;
781 DPRINT_INFO(STORVSC_DRV
, "retrying scmnd %p cmd_request %p",
787 /* ASSERT(scmnd->scsi_done == NULL); */
788 /* ASSERT(scmnd->host_scribble == NULL); */
790 scmnd
->scsi_done
= done
;
792 request_size
= sizeof(struct storvsc_cmd_request
);
794 cmd_request
= kmem_cache_zalloc(host_dev
->request_pool
,
797 scmnd
->scsi_done
= NULL
;
798 return SCSI_MLQUEUE_DEVICE_BUSY
;
801 /* Setup the cmd request */
802 cmd_request
->bounce_sgl_count
= 0;
803 cmd_request
->bounce_sgl
= NULL
;
804 cmd_request
->cmd
= scmnd
;
806 scmnd
->host_scribble
= (unsigned char *)cmd_request
;
808 request
= &cmd_request
->request
;
809 vm_srb
= &request
->vstor_packet
.vm_srb
;
813 switch (scmnd
->sc_data_direction
) {
815 vm_srb
->data_in
= WRITE_TYPE
;
817 case DMA_FROM_DEVICE
:
818 vm_srb
->data_in
= READ_TYPE
;
821 vm_srb
->data_in
= UNKNOWN_TYPE
;
825 request
->on_io_completion
= storvsc_commmand_completion
;
826 request
->context
= cmd_request
;/* scmnd; */
828 /* request->PortId = scmnd->device->channel; */
829 vm_srb
->port_number
= host_dev
->port
;
830 vm_srb
->path_id
= scmnd
->device
->channel
;
831 vm_srb
->target_id
= scmnd
->device
->id
;
832 vm_srb
->lun
= scmnd
->device
->lun
;
834 /* ASSERT(scmnd->cmd_len <= 16); */
835 vm_srb
->cdb_length
= scmnd
->cmd_len
;
837 memcpy(vm_srb
->cdb
, scmnd
->cmnd
, vm_srb
->cdb_length
);
839 request
->sense_buffer
= scmnd
->sense_buffer
;
842 request
->data_buffer
.len
= scsi_bufflen(scmnd
);
843 if (scsi_sg_count(scmnd
)) {
844 sgl
= (struct scatterlist
*)scsi_sglist(scmnd
);
845 sg_count
= scsi_sg_count(scmnd
);
847 /* check if we need to bounce the sgl */
848 if (do_bounce_buffer(sgl
, scsi_sg_count(scmnd
)) != -1) {
849 cmd_request
->bounce_sgl
=
850 create_bounce_buffer(sgl
, scsi_sg_count(scmnd
),
851 scsi_bufflen(scmnd
));
852 if (!cmd_request
->bounce_sgl
) {
853 scmnd
->scsi_done
= NULL
;
854 scmnd
->host_scribble
= NULL
;
855 kmem_cache_free(host_dev
->request_pool
,
858 return SCSI_MLQUEUE_HOST_BUSY
;
861 cmd_request
->bounce_sgl_count
=
862 ALIGN(scsi_bufflen(scmnd
), PAGE_SIZE
) >>
866 * FIXME: We can optimize on reads by just skipping
869 copy_to_bounce_buffer(sgl
, cmd_request
->bounce_sgl
,
870 scsi_sg_count(scmnd
));
872 sgl
= cmd_request
->bounce_sgl
;
873 sg_count
= cmd_request
->bounce_sgl_count
;
876 request
->data_buffer
.offset
= sgl
[0].offset
;
878 for (i
= 0; i
< sg_count
; i
++)
879 request
->data_buffer
.pfn_array
[i
] =
880 page_to_pfn(sg_page((&sgl
[i
])));
882 } else if (scsi_sglist(scmnd
)) {
883 /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */
884 request
->data_buffer
.offset
=
885 virt_to_phys(scsi_sglist(scmnd
)) & (PAGE_SIZE
-1);
886 request
->data_buffer
.pfn_array
[0] =
887 virt_to_phys(scsi_sglist(scmnd
)) >> PAGE_SHIFT
;
891 /* Invokes the vsc to start an IO */
892 ret
= storvsc_drv_obj
->on_io_request(dev
,
893 &cmd_request
->request
);
897 if (cmd_request
->bounce_sgl_count
) {
899 * FIXME: We can optimize on writes by just skipping
902 copy_from_bounce_buffer(scsi_sglist(scmnd
),
903 cmd_request
->bounce_sgl
,
904 scsi_sg_count(scmnd
));
905 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
906 cmd_request
->bounce_sgl_count
);
909 kmem_cache_free(host_dev
->request_pool
, cmd_request
);
911 scmnd
->scsi_done
= NULL
;
912 scmnd
->host_scribble
= NULL
;
914 ret
= SCSI_MLQUEUE_DEVICE_BUSY
;
920 static DEF_SCSI_QCMD(storvsc_queuecommand
)
923 * storvsc_host_reset_handler - Reset the scsi HBA
925 static int storvsc_host_reset_handler(struct scsi_cmnd
*scmnd
)
928 struct hv_host_device
*host_dev
=
929 (struct hv_host_device
*)scmnd
->device
->host
->hostdata
;
930 struct hv_device
*dev
= host_dev
->dev
;
932 DPRINT_INFO(STORVSC_DRV
, "sdev (%p) dev obj (%p) - host resetting...",
935 /* Invokes the vsc to reset the host/bus */
936 ret
= stor_vsc_on_host_reset(dev
);
940 DPRINT_INFO(STORVSC_DRV
, "sdev (%p) dev obj (%p) - host reseted",
946 static int __init
storvsc_init(void)
950 DPRINT_INFO(STORVSC_DRV
, "Storvsc initializing....");
951 ret
= storvsc_drv_init();
955 static void __exit
storvsc_exit(void)
960 MODULE_LICENSE("GPL");
961 MODULE_VERSION(HV_DRV_VERSION
);
962 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
963 module_init(storvsc_init
);
964 module_exit(storvsc_exit
);