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>
23 #include <linux/kernel.h>
24 #include <linux/wait.h>
25 #include <linux/sched.h>
26 #include <linux/completion.h>
27 #include <linux/string.h>
29 #include <linux/delay.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/module.h>
33 #include <linux/device.h>
34 #include <linux/hyperv.h>
35 #include <linux/mempool.h>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <scsi/scsi_host.h>
39 #include <scsi/scsi_device.h>
40 #include <scsi/scsi_tcq.h>
41 #include <scsi/scsi_eh.h>
42 #include <scsi/scsi_devinfo.h>
43 #include <scsi/scsi_dbg.h>
46 * All wire protocol details (storage protocol between the guest and the host)
47 * are consolidated here.
49 * Begin protocol definitions.
55 * V1 RC < 2008/1/31: 1.0
56 * V1 RC > 2008/1/31: 2.0
62 #define VMSTOR_WIN7_MAJOR 4
63 #define VMSTOR_WIN7_MINOR 2
65 #define VMSTOR_WIN8_MAJOR 5
66 #define VMSTOR_WIN8_MINOR 1
69 /* Packet structure describing virtual storage requests. */
70 enum vstor_packet_operation
{
71 VSTOR_OPERATION_COMPLETE_IO
= 1,
72 VSTOR_OPERATION_REMOVE_DEVICE
= 2,
73 VSTOR_OPERATION_EXECUTE_SRB
= 3,
74 VSTOR_OPERATION_RESET_LUN
= 4,
75 VSTOR_OPERATION_RESET_ADAPTER
= 5,
76 VSTOR_OPERATION_RESET_BUS
= 6,
77 VSTOR_OPERATION_BEGIN_INITIALIZATION
= 7,
78 VSTOR_OPERATION_END_INITIALIZATION
= 8,
79 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION
= 9,
80 VSTOR_OPERATION_QUERY_PROPERTIES
= 10,
81 VSTOR_OPERATION_ENUMERATE_BUS
= 11,
82 VSTOR_OPERATION_FCHBA_DATA
= 12,
83 VSTOR_OPERATION_CREATE_SUB_CHANNELS
= 13,
84 VSTOR_OPERATION_MAXIMUM
= 13
88 * WWN packet for Fibre Channel HBA
91 struct hv_fc_wwn_packet
{
95 u8 primary_port_wwn
[8];
96 u8 primary_node_wwn
[8];
97 u8 secondary_port_wwn
[8];
98 u8 secondary_node_wwn
[8];
107 #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002
108 #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004
109 #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008
110 #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010
111 #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020
112 #define SRB_FLAGS_DATA_IN 0x00000040
113 #define SRB_FLAGS_DATA_OUT 0x00000080
114 #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000
115 #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)
116 #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100
117 #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200
118 #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400
121 * This flag indicates the request is part of the workflow for processing a D3.
123 #define SRB_FLAGS_D3_PROCESSING 0x00000800
124 #define SRB_FLAGS_IS_ACTIVE 0x00010000
125 #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000
126 #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000
127 #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000
128 #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000
129 #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000
130 #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000
131 #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000
132 #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000
133 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000
137 * Platform neutral description of a scsi request -
138 * this remains the same across the write regardless of 32/64 bit
139 * note: it's patterned off the SCSI_PASS_THROUGH structure
141 #define STORVSC_MAX_CMD_LEN 0x10
143 #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
144 #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
146 #define STORVSC_SENSE_BUFFER_SIZE 0x14
147 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
150 * Sense buffer size changed in win8; have a run-time
151 * variable to track the size we should use.
153 static int sense_buffer_size
;
156 * The size of the vmscsi_request has changed in win8. The
157 * additional size is because of new elements added to the
158 * structure. These elements are valid only when we are talking
160 * Track the correction to size we need to apply.
163 static int vmscsi_size_delta
;
164 static int vmstor_current_major
;
165 static int vmstor_current_minor
;
167 struct vmscsi_win8_extension
{
169 * The following were added in Windows 8
179 struct vmscsi_request
{
190 u8 sense_info_length
;
194 u32 data_transfer_length
;
197 u8 cdb
[STORVSC_MAX_CMD_LEN
];
198 u8 sense_data
[STORVSC_SENSE_BUFFER_SIZE
];
199 u8 reserved_array
[STORVSC_MAX_BUF_LEN_WITH_PADDING
];
202 * The following was added in win8.
204 struct vmscsi_win8_extension win8_extension
;
206 } __attribute((packed
));
210 * This structure is sent during the intialization phase to get the different
211 * properties of the channel.
214 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
216 struct vmstorage_channel_properties
{
222 u32 max_transfer_bytes
;
227 /* This structure is sent during the storage protocol negotiations. */
228 struct vmstorage_protocol_version
{
229 /* Major (MSW) and minor (LSW) version numbers. */
233 * Revision number is auto-incremented whenever this file is changed
234 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
235 * definitely indicate incompatibility--but it does indicate mismatched
237 * This is only used on the windows side. Just set it to 0.
242 /* Channel Property Flags */
243 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
244 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
246 struct vstor_packet
{
247 /* Requested operation type */
248 enum vstor_packet_operation operation
;
250 /* Flags - see below for values */
253 /* Status of the request returned from the server side. */
256 /* Data payload area */
259 * Structure used to forward SCSI commands from the
260 * client to the server.
262 struct vmscsi_request vm_srb
;
264 /* Structure used to query channel properties. */
265 struct vmstorage_channel_properties storage_channel_properties
;
267 /* Used during version negotiations. */
268 struct vmstorage_protocol_version version
;
270 /* Fibre channel address packet */
271 struct hv_fc_wwn_packet wwn_packet
;
273 /* Number of sub-channels to create */
274 u16 sub_channel_count
;
276 /* This will be the maximum of the union members */
284 * This flag indicates that the server should send back a completion for this
288 #define REQUEST_COMPLETION_FLAG 0x1
290 /* Matches Windows-end */
291 enum storvsc_request_type
{
298 * SRB status codes and masks; a subset of the codes used here.
301 #define SRB_STATUS_AUTOSENSE_VALID 0x80
302 #define SRB_STATUS_INVALID_LUN 0x20
303 #define SRB_STATUS_SUCCESS 0x01
304 #define SRB_STATUS_ABORTED 0x02
305 #define SRB_STATUS_ERROR 0x04
308 * This is the end of Protocol specific defines.
313 * We setup a mempool to allocate request structures for this driver
314 * on a per-lun basis. The following define specifies the number of
315 * elements in the pool.
318 #define STORVSC_MIN_BUF_NR 64
319 static int storvsc_ringbuffer_size
= (20 * PAGE_SIZE
);
321 module_param(storvsc_ringbuffer_size
, int, S_IRUGO
);
322 MODULE_PARM_DESC(storvsc_ringbuffer_size
, "Ring buffer size (bytes)");
325 * Timeout in seconds for all devices managed by this driver.
327 static int storvsc_timeout
= 180;
329 #define STORVSC_MAX_IO_REQUESTS 128
332 * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
333 * reality, the path/target is not used (ie always set to 0) so our
334 * scsi host adapter essentially has 1 bus with 1 target that contains
337 #define STORVSC_MAX_LUNS_PER_TARGET 64
338 #define STORVSC_MAX_TARGETS 1
339 #define STORVSC_MAX_CHANNELS 1
343 struct storvsc_cmd_request
{
344 struct list_head entry
;
345 struct scsi_cmnd
*cmd
;
347 unsigned int bounce_sgl_count
;
348 struct scatterlist
*bounce_sgl
;
350 struct hv_device
*device
;
352 /* Synchronize the request/response if needed */
353 struct completion wait_event
;
355 unsigned char *sense_buffer
;
356 struct hv_multipage_buffer data_buffer
;
357 struct vstor_packet vstor_packet
;
361 /* A storvsc device is a device object that contains a vmbus channel */
362 struct storvsc_device
{
363 struct hv_device
*device
;
367 atomic_t num_outstanding_req
;
368 struct Scsi_Host
*host
;
370 wait_queue_head_t waiting_to_drain
;
373 * Each unique Port/Path/Target represents 1 channel ie scsi
374 * controller. In reality, the pathid, targetid is always 0
375 * and the port is set by us
377 unsigned int port_number
;
378 unsigned char path_id
;
379 unsigned char target_id
;
381 /* Used for vsc/vsp channel reset process */
382 struct storvsc_cmd_request init_request
;
383 struct storvsc_cmd_request reset_request
;
386 struct stor_mem_pools
{
387 struct kmem_cache
*request_pool
;
388 mempool_t
*request_mempool
;
391 struct hv_host_device
{
392 struct hv_device
*dev
;
395 unsigned char target
;
398 struct storvsc_scan_work
{
399 struct work_struct work
;
400 struct Scsi_Host
*host
;
404 static void storvsc_device_scan(struct work_struct
*work
)
406 struct storvsc_scan_work
*wrk
;
408 struct scsi_device
*sdev
;
410 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
413 sdev
= scsi_device_lookup(wrk
->host
, 0, 0, lun
);
416 scsi_rescan_device(&sdev
->sdev_gendev
);
417 scsi_device_put(sdev
);
423 static void storvsc_bus_scan(struct work_struct
*work
)
425 struct storvsc_scan_work
*wrk
;
428 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
429 for (id
= 0; id
< wrk
->host
->max_id
; ++id
) {
430 if (wrk
->host
->reverse_ordering
)
431 order_id
= wrk
->host
->max_id
- id
- 1;
435 scsi_scan_target(&wrk
->host
->shost_gendev
, 0,
436 order_id
, SCAN_WILD_CARD
, 1);
441 static void storvsc_remove_lun(struct work_struct
*work
)
443 struct storvsc_scan_work
*wrk
;
444 struct scsi_device
*sdev
;
446 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
447 if (!scsi_host_get(wrk
->host
))
450 sdev
= scsi_device_lookup(wrk
->host
, 0, 0, wrk
->lun
);
453 scsi_remove_device(sdev
);
454 scsi_device_put(sdev
);
456 scsi_host_put(wrk
->host
);
463 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
464 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
467 static inline u16
storvsc_get_version(u8 major
, u8 minor
)
471 version
= ((major
<< 8) | minor
);
476 * We can get incoming messages from the host that are not in response to
477 * messages that we have sent out. An example of this would be messages
478 * received by the guest to notify dynamic addition/removal of LUNs. To
479 * deal with potential race conditions where the driver may be in the
480 * midst of being unloaded when we might receive an unsolicited message
481 * from the host, we have implemented a mechanism to gurantee sequential
484 * 1) Once the device is marked as being destroyed, we will fail all
486 * 2) We permit incoming messages when the device is being destroyed,
487 * only to properly account for messages already sent out.
490 static inline struct storvsc_device
*get_out_stor_device(
491 struct hv_device
*device
)
493 struct storvsc_device
*stor_device
;
495 stor_device
= hv_get_drvdata(device
);
497 if (stor_device
&& stor_device
->destroy
)
504 static inline void storvsc_wait_to_drain(struct storvsc_device
*dev
)
506 dev
->drain_notify
= true;
507 wait_event(dev
->waiting_to_drain
,
508 atomic_read(&dev
->num_outstanding_req
) == 0);
509 dev
->drain_notify
= false;
512 static inline struct storvsc_device
*get_in_stor_device(
513 struct hv_device
*device
)
515 struct storvsc_device
*stor_device
;
517 stor_device
= hv_get_drvdata(device
);
523 * If the device is being destroyed; allow incoming
524 * traffic only to cleanup outstanding requests.
527 if (stor_device
->destroy
&&
528 (atomic_read(&stor_device
->num_outstanding_req
) == 0))
536 static void destroy_bounce_buffer(struct scatterlist
*sgl
,
537 unsigned int sg_count
)
540 struct page
*page_buf
;
542 for (i
= 0; i
< sg_count
; i
++) {
543 page_buf
= sg_page((&sgl
[i
]));
544 if (page_buf
!= NULL
)
545 __free_page(page_buf
);
551 static int do_bounce_buffer(struct scatterlist
*sgl
, unsigned int sg_count
)
555 /* No need to check */
559 /* We have at least 2 sg entries */
560 for (i
= 0; i
< sg_count
; i
++) {
562 /* make sure 1st one does not have hole */
563 if (sgl
[i
].offset
+ sgl
[i
].length
!= PAGE_SIZE
)
565 } else if (i
== sg_count
- 1) {
566 /* make sure last one does not have hole */
567 if (sgl
[i
].offset
!= 0)
570 /* make sure no hole in the middle */
571 if (sgl
[i
].length
!= PAGE_SIZE
|| sgl
[i
].offset
!= 0)
578 static struct scatterlist
*create_bounce_buffer(struct scatterlist
*sgl
,
579 unsigned int sg_count
,
585 struct scatterlist
*bounce_sgl
;
586 struct page
*page_buf
;
587 unsigned int buf_len
= ((write
== WRITE_TYPE
) ? 0 : PAGE_SIZE
);
589 num_pages
= ALIGN(len
, PAGE_SIZE
) >> PAGE_SHIFT
;
591 bounce_sgl
= kcalloc(num_pages
, sizeof(struct scatterlist
), GFP_ATOMIC
);
595 sg_init_table(bounce_sgl
, num_pages
);
596 for (i
= 0; i
< num_pages
; i
++) {
597 page_buf
= alloc_page(GFP_ATOMIC
);
600 sg_set_page(&bounce_sgl
[i
], page_buf
, buf_len
, 0);
606 destroy_bounce_buffer(bounce_sgl
, num_pages
);
610 /* Disgusting wrapper functions */
611 static inline unsigned long sg_kmap_atomic(struct scatterlist
*sgl
, int idx
)
613 void *addr
= kmap_atomic(sg_page(sgl
+ idx
));
614 return (unsigned long)addr
;
617 static inline void sg_kunmap_atomic(unsigned long addr
)
619 kunmap_atomic((void *)addr
);
623 /* Assume the original sgl has enough room */
624 static unsigned int copy_from_bounce_buffer(struct scatterlist
*orig_sgl
,
625 struct scatterlist
*bounce_sgl
,
626 unsigned int orig_sgl_count
,
627 unsigned int bounce_sgl_count
)
631 unsigned long src
, dest
;
632 unsigned int srclen
, destlen
, copylen
;
633 unsigned int total_copied
= 0;
634 unsigned long bounce_addr
= 0;
635 unsigned long dest_addr
= 0;
638 local_irq_save(flags
);
640 for (i
= 0; i
< orig_sgl_count
; i
++) {
641 dest_addr
= sg_kmap_atomic(orig_sgl
,i
) + orig_sgl
[i
].offset
;
643 destlen
= orig_sgl
[i
].length
;
645 if (bounce_addr
== 0)
646 bounce_addr
= sg_kmap_atomic(bounce_sgl
,j
);
649 src
= bounce_addr
+ bounce_sgl
[j
].offset
;
650 srclen
= bounce_sgl
[j
].length
- bounce_sgl
[j
].offset
;
652 copylen
= min(srclen
, destlen
);
653 memcpy((void *)dest
, (void *)src
, copylen
);
655 total_copied
+= copylen
;
656 bounce_sgl
[j
].offset
+= copylen
;
660 if (bounce_sgl
[j
].offset
== bounce_sgl
[j
].length
) {
662 sg_kunmap_atomic(bounce_addr
);
666 * It is possible that the number of elements
667 * in the bounce buffer may not be equal to
668 * the number of elements in the original
669 * scatter list. Handle this correctly.
672 if (j
== bounce_sgl_count
) {
674 * We are done; cleanup and return.
676 sg_kunmap_atomic(dest_addr
- orig_sgl
[i
].offset
);
677 local_irq_restore(flags
);
681 /* if we need to use another bounce buffer */
682 if (destlen
|| i
!= orig_sgl_count
- 1)
683 bounce_addr
= sg_kmap_atomic(bounce_sgl
,j
);
684 } else if (destlen
== 0 && i
== orig_sgl_count
- 1) {
685 /* unmap the last bounce that is < PAGE_SIZE */
686 sg_kunmap_atomic(bounce_addr
);
690 sg_kunmap_atomic(dest_addr
- orig_sgl
[i
].offset
);
693 local_irq_restore(flags
);
698 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
699 static unsigned int copy_to_bounce_buffer(struct scatterlist
*orig_sgl
,
700 struct scatterlist
*bounce_sgl
,
701 unsigned int orig_sgl_count
)
705 unsigned long src
, dest
;
706 unsigned int srclen
, destlen
, copylen
;
707 unsigned int total_copied
= 0;
708 unsigned long bounce_addr
= 0;
709 unsigned long src_addr
= 0;
712 local_irq_save(flags
);
714 for (i
= 0; i
< orig_sgl_count
; i
++) {
715 src_addr
= sg_kmap_atomic(orig_sgl
,i
) + orig_sgl
[i
].offset
;
717 srclen
= orig_sgl
[i
].length
;
719 if (bounce_addr
== 0)
720 bounce_addr
= sg_kmap_atomic(bounce_sgl
,j
);
723 /* assume bounce offset always == 0 */
724 dest
= bounce_addr
+ bounce_sgl
[j
].length
;
725 destlen
= PAGE_SIZE
- bounce_sgl
[j
].length
;
727 copylen
= min(srclen
, destlen
);
728 memcpy((void *)dest
, (void *)src
, copylen
);
730 total_copied
+= copylen
;
731 bounce_sgl
[j
].length
+= copylen
;
735 if (bounce_sgl
[j
].length
== PAGE_SIZE
) {
736 /* full..move to next entry */
737 sg_kunmap_atomic(bounce_addr
);
740 /* if we need to use another bounce buffer */
741 if (srclen
|| i
!= orig_sgl_count
- 1)
742 bounce_addr
= sg_kmap_atomic(bounce_sgl
,j
);
744 } else if (srclen
== 0 && i
== orig_sgl_count
- 1) {
745 /* unmap the last bounce that is < PAGE_SIZE */
746 sg_kunmap_atomic(bounce_addr
);
750 sg_kunmap_atomic(src_addr
- orig_sgl
[i
].offset
);
753 local_irq_restore(flags
);
758 static int storvsc_channel_init(struct hv_device
*device
)
760 struct storvsc_device
*stor_device
;
761 struct storvsc_cmd_request
*request
;
762 struct vstor_packet
*vstor_packet
;
765 stor_device
= get_out_stor_device(device
);
769 request
= &stor_device
->init_request
;
770 vstor_packet
= &request
->vstor_packet
;
773 * Now, initiate the vsc/vsp initialization protocol on the open
776 memset(request
, 0, sizeof(struct storvsc_cmd_request
));
777 init_completion(&request
->wait_event
);
778 vstor_packet
->operation
= VSTOR_OPERATION_BEGIN_INITIALIZATION
;
779 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
781 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
782 (sizeof(struct vstor_packet
) -
784 (unsigned long)request
,
786 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
790 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
796 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
797 vstor_packet
->status
!= 0)
801 /* reuse the packet for version range supported */
802 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
803 vstor_packet
->operation
= VSTOR_OPERATION_QUERY_PROTOCOL_VERSION
;
804 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
806 vstor_packet
->version
.major_minor
=
807 storvsc_get_version(vmstor_current_major
, vmstor_current_minor
);
810 * The revision number is only used in Windows; set it to 0.
812 vstor_packet
->version
.revision
= 0;
814 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
815 (sizeof(struct vstor_packet
) -
817 (unsigned long)request
,
819 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
823 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
829 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
830 vstor_packet
->status
!= 0)
834 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
835 vstor_packet
->operation
= VSTOR_OPERATION_QUERY_PROPERTIES
;
836 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
838 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
839 (sizeof(struct vstor_packet
) -
841 (unsigned long)request
,
843 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
848 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
854 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
855 vstor_packet
->status
!= 0)
858 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
859 vstor_packet
->operation
= VSTOR_OPERATION_END_INITIALIZATION
;
860 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
862 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
863 (sizeof(struct vstor_packet
) -
865 (unsigned long)request
,
867 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
872 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
878 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
879 vstor_packet
->status
!= 0)
887 static void storvsc_handle_error(struct vmscsi_request
*vm_srb
,
888 struct scsi_cmnd
*scmnd
,
889 struct Scsi_Host
*host
,
892 struct storvsc_scan_work
*wrk
;
893 void (*process_err_fn
)(struct work_struct
*work
);
894 bool do_work
= false;
896 switch (vm_srb
->srb_status
) {
897 case SRB_STATUS_ERROR
:
899 * If there is an error; offline the device since all
900 * error recovery strategies would have already been
901 * deployed on the host side. However, if the command
902 * were a pass-through command deal with it appropriately.
904 switch (scmnd
->cmnd
[0]) {
907 set_host_byte(scmnd
, DID_PASSTHROUGH
);
910 set_host_byte(scmnd
, DID_TARGET_FAILURE
);
913 case SRB_STATUS_INVALID_LUN
:
915 process_err_fn
= storvsc_remove_lun
;
917 case (SRB_STATUS_ABORTED
| SRB_STATUS_AUTOSENSE_VALID
):
918 if ((asc
== 0x2a) && (ascq
== 0x9)) {
920 process_err_fn
= storvsc_device_scan
;
922 * Retry the I/O that trigerred this.
924 set_host_byte(scmnd
, DID_REQUEUE
);
933 * We need to schedule work to process this error; schedule it.
935 wrk
= kmalloc(sizeof(struct storvsc_scan_work
), GFP_ATOMIC
);
937 set_host_byte(scmnd
, DID_TARGET_FAILURE
);
942 wrk
->lun
= vm_srb
->lun
;
943 INIT_WORK(&wrk
->work
, process_err_fn
);
944 schedule_work(&wrk
->work
);
948 static void storvsc_command_completion(struct storvsc_cmd_request
*cmd_request
)
950 struct scsi_cmnd
*scmnd
= cmd_request
->cmd
;
951 struct hv_host_device
*host_dev
= shost_priv(scmnd
->device
->host
);
952 void (*scsi_done_fn
)(struct scsi_cmnd
*);
953 struct scsi_sense_hdr sense_hdr
;
954 struct vmscsi_request
*vm_srb
;
955 struct stor_mem_pools
*memp
= scmnd
->device
->hostdata
;
956 struct Scsi_Host
*host
;
957 struct storvsc_device
*stor_dev
;
958 struct hv_device
*dev
= host_dev
->dev
;
960 stor_dev
= get_in_stor_device(dev
);
961 host
= stor_dev
->host
;
963 vm_srb
= &cmd_request
->vstor_packet
.vm_srb
;
964 if (cmd_request
->bounce_sgl_count
) {
965 if (vm_srb
->data_in
== READ_TYPE
)
966 copy_from_bounce_buffer(scsi_sglist(scmnd
),
967 cmd_request
->bounce_sgl
,
968 scsi_sg_count(scmnd
),
969 cmd_request
->bounce_sgl_count
);
970 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
971 cmd_request
->bounce_sgl_count
);
974 scmnd
->result
= vm_srb
->scsi_status
;
977 if (scsi_normalize_sense(scmnd
->sense_buffer
,
978 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
979 scsi_print_sense_hdr("storvsc", &sense_hdr
);
982 if (vm_srb
->srb_status
!= SRB_STATUS_SUCCESS
)
983 storvsc_handle_error(vm_srb
, scmnd
, host
, sense_hdr
.asc
,
986 scsi_set_resid(scmnd
,
987 cmd_request
->data_buffer
.len
-
988 vm_srb
->data_transfer_length
);
990 scsi_done_fn
= scmnd
->scsi_done
;
992 scmnd
->host_scribble
= NULL
;
993 scmnd
->scsi_done
= NULL
;
997 mempool_free(cmd_request
, memp
->request_mempool
);
1000 static void storvsc_on_io_completion(struct hv_device
*device
,
1001 struct vstor_packet
*vstor_packet
,
1002 struct storvsc_cmd_request
*request
)
1004 struct storvsc_device
*stor_device
;
1005 struct vstor_packet
*stor_pkt
;
1007 stor_device
= hv_get_drvdata(device
);
1008 stor_pkt
= &request
->vstor_packet
;
1011 * The current SCSI handling on the host side does
1012 * not correctly handle:
1013 * INQUIRY command with page code parameter set to 0x80
1014 * MODE_SENSE command with cmd[2] == 0x1c
1016 * Setup srb and scsi status so this won't be fatal.
1017 * We do this so we can distinguish truly fatal failues
1018 * (srb status == 0x4) and off-line the device in that case.
1021 if ((stor_pkt
->vm_srb
.cdb
[0] == INQUIRY
) ||
1022 (stor_pkt
->vm_srb
.cdb
[0] == MODE_SENSE
)) {
1023 vstor_packet
->vm_srb
.scsi_status
= 0;
1024 vstor_packet
->vm_srb
.srb_status
= SRB_STATUS_SUCCESS
;
1028 /* Copy over the status...etc */
1029 stor_pkt
->vm_srb
.scsi_status
= vstor_packet
->vm_srb
.scsi_status
;
1030 stor_pkt
->vm_srb
.srb_status
= vstor_packet
->vm_srb
.srb_status
;
1031 stor_pkt
->vm_srb
.sense_info_length
=
1032 vstor_packet
->vm_srb
.sense_info_length
;
1034 if (vstor_packet
->vm_srb
.scsi_status
!= 0 ||
1035 vstor_packet
->vm_srb
.srb_status
!= SRB_STATUS_SUCCESS
){
1036 dev_warn(&device
->device
,
1037 "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
1038 stor_pkt
->vm_srb
.cdb
[0],
1039 vstor_packet
->vm_srb
.scsi_status
,
1040 vstor_packet
->vm_srb
.srb_status
);
1043 if ((vstor_packet
->vm_srb
.scsi_status
& 0xFF) == 0x02) {
1044 /* CHECK_CONDITION */
1045 if (vstor_packet
->vm_srb
.srb_status
&
1046 SRB_STATUS_AUTOSENSE_VALID
) {
1047 /* autosense data available */
1048 dev_warn(&device
->device
,
1049 "stor pkt %p autosense data valid - len %d\n",
1051 vstor_packet
->vm_srb
.sense_info_length
);
1053 memcpy(request
->sense_buffer
,
1054 vstor_packet
->vm_srb
.sense_data
,
1055 vstor_packet
->vm_srb
.sense_info_length
);
1060 stor_pkt
->vm_srb
.data_transfer_length
=
1061 vstor_packet
->vm_srb
.data_transfer_length
;
1063 storvsc_command_completion(request
);
1065 if (atomic_dec_and_test(&stor_device
->num_outstanding_req
) &&
1066 stor_device
->drain_notify
)
1067 wake_up(&stor_device
->waiting_to_drain
);
1072 static void storvsc_on_receive(struct hv_device
*device
,
1073 struct vstor_packet
*vstor_packet
,
1074 struct storvsc_cmd_request
*request
)
1076 struct storvsc_scan_work
*work
;
1077 struct storvsc_device
*stor_device
;
1079 switch (vstor_packet
->operation
) {
1080 case VSTOR_OPERATION_COMPLETE_IO
:
1081 storvsc_on_io_completion(device
, vstor_packet
, request
);
1084 case VSTOR_OPERATION_REMOVE_DEVICE
:
1085 case VSTOR_OPERATION_ENUMERATE_BUS
:
1086 stor_device
= get_in_stor_device(device
);
1087 work
= kmalloc(sizeof(struct storvsc_scan_work
), GFP_ATOMIC
);
1091 INIT_WORK(&work
->work
, storvsc_bus_scan
);
1092 work
->host
= stor_device
->host
;
1093 schedule_work(&work
->work
);
1101 static void storvsc_on_channel_callback(void *context
)
1103 struct hv_device
*device
= (struct hv_device
*)context
;
1104 struct storvsc_device
*stor_device
;
1107 unsigned char packet
[ALIGN(sizeof(struct vstor_packet
), 8)];
1108 struct storvsc_cmd_request
*request
;
1112 stor_device
= get_in_stor_device(device
);
1117 ret
= vmbus_recvpacket(device
->channel
, packet
,
1118 ALIGN((sizeof(struct vstor_packet
) -
1119 vmscsi_size_delta
), 8),
1120 &bytes_recvd
, &request_id
);
1121 if (ret
== 0 && bytes_recvd
> 0) {
1123 request
= (struct storvsc_cmd_request
*)
1124 (unsigned long)request_id
;
1126 if ((request
== &stor_device
->init_request
) ||
1127 (request
== &stor_device
->reset_request
)) {
1129 memcpy(&request
->vstor_packet
, packet
,
1130 (sizeof(struct vstor_packet
) -
1131 vmscsi_size_delta
));
1132 complete(&request
->wait_event
);
1134 storvsc_on_receive(device
,
1135 (struct vstor_packet
*)packet
,
1146 static int storvsc_connect_to_vsp(struct hv_device
*device
, u32 ring_size
)
1148 struct vmstorage_channel_properties props
;
1151 memset(&props
, 0, sizeof(struct vmstorage_channel_properties
));
1153 ret
= vmbus_open(device
->channel
,
1157 sizeof(struct vmstorage_channel_properties
),
1158 storvsc_on_channel_callback
, device
);
1163 ret
= storvsc_channel_init(device
);
1168 static int storvsc_dev_remove(struct hv_device
*device
)
1170 struct storvsc_device
*stor_device
;
1171 unsigned long flags
;
1173 stor_device
= hv_get_drvdata(device
);
1175 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
1176 stor_device
->destroy
= true;
1177 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
1180 * At this point, all outbound traffic should be disable. We
1181 * only allow inbound traffic (responses) to proceed so that
1182 * outstanding requests can be completed.
1185 storvsc_wait_to_drain(stor_device
);
1188 * Since we have already drained, we don't need to busy wait
1189 * as was done in final_release_stor_device()
1190 * Note that we cannot set the ext pointer to NULL until
1191 * we have drained - to drain the outgoing packets, we need to
1192 * allow incoming packets.
1194 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
1195 hv_set_drvdata(device
, NULL
);
1196 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
1198 /* Close the channel */
1199 vmbus_close(device
->channel
);
1205 static int storvsc_do_io(struct hv_device
*device
,
1206 struct storvsc_cmd_request
*request
)
1208 struct storvsc_device
*stor_device
;
1209 struct vstor_packet
*vstor_packet
;
1212 vstor_packet
= &request
->vstor_packet
;
1213 stor_device
= get_out_stor_device(device
);
1219 request
->device
= device
;
1222 vstor_packet
->flags
|= REQUEST_COMPLETION_FLAG
;
1224 vstor_packet
->vm_srb
.length
= (sizeof(struct vmscsi_request
) -
1228 vstor_packet
->vm_srb
.sense_info_length
= sense_buffer_size
;
1231 vstor_packet
->vm_srb
.data_transfer_length
=
1232 request
->data_buffer
.len
;
1234 vstor_packet
->operation
= VSTOR_OPERATION_EXECUTE_SRB
;
1236 if (request
->data_buffer
.len
) {
1237 ret
= vmbus_sendpacket_multipagebuffer(device
->channel
,
1238 &request
->data_buffer
,
1240 (sizeof(struct vstor_packet
) -
1242 (unsigned long)request
);
1244 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
1245 (sizeof(struct vstor_packet
) -
1247 (unsigned long)request
,
1249 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
1255 atomic_inc(&stor_device
->num_outstanding_req
);
1260 static int storvsc_device_alloc(struct scsi_device
*sdevice
)
1262 struct stor_mem_pools
*memp
;
1263 int number
= STORVSC_MIN_BUF_NR
;
1265 memp
= kzalloc(sizeof(struct stor_mem_pools
), GFP_KERNEL
);
1269 memp
->request_pool
=
1270 kmem_cache_create(dev_name(&sdevice
->sdev_dev
),
1271 sizeof(struct storvsc_cmd_request
), 0,
1272 SLAB_HWCACHE_ALIGN
, NULL
);
1274 if (!memp
->request_pool
)
1277 memp
->request_mempool
= mempool_create(number
, mempool_alloc_slab
,
1279 memp
->request_pool
);
1281 if (!memp
->request_mempool
)
1284 sdevice
->hostdata
= memp
;
1289 kmem_cache_destroy(memp
->request_pool
);
1296 static void storvsc_device_destroy(struct scsi_device
*sdevice
)
1298 struct stor_mem_pools
*memp
= sdevice
->hostdata
;
1300 mempool_destroy(memp
->request_mempool
);
1301 kmem_cache_destroy(memp
->request_pool
);
1303 sdevice
->hostdata
= NULL
;
1306 static int storvsc_device_configure(struct scsi_device
*sdevice
)
1308 scsi_adjust_queue_depth(sdevice
, MSG_SIMPLE_TAG
,
1309 STORVSC_MAX_IO_REQUESTS
);
1311 blk_queue_max_segment_size(sdevice
->request_queue
, PAGE_SIZE
);
1313 blk_queue_bounce_limit(sdevice
->request_queue
, BLK_BOUNCE_ANY
);
1315 blk_queue_rq_timeout(sdevice
->request_queue
, (storvsc_timeout
* HZ
));
1317 sdevice
->no_write_same
= 1;
1322 static int storvsc_get_chs(struct scsi_device
*sdev
, struct block_device
* bdev
,
1323 sector_t capacity
, int *info
)
1325 sector_t nsect
= capacity
;
1326 sector_t cylinders
= nsect
;
1327 int heads
, sectors_pt
;
1330 * We are making up these values; let us keep it simple.
1333 sectors_pt
= 0x3f; /* Sectors per track */
1334 sector_div(cylinders
, heads
* sectors_pt
);
1335 if ((sector_t
)(cylinders
+ 1) * heads
* sectors_pt
< nsect
)
1339 info
[1] = sectors_pt
;
1340 info
[2] = (int)cylinders
;
1345 static int storvsc_host_reset_handler(struct scsi_cmnd
*scmnd
)
1347 struct hv_host_device
*host_dev
= shost_priv(scmnd
->device
->host
);
1348 struct hv_device
*device
= host_dev
->dev
;
1350 struct storvsc_device
*stor_device
;
1351 struct storvsc_cmd_request
*request
;
1352 struct vstor_packet
*vstor_packet
;
1356 stor_device
= get_out_stor_device(device
);
1360 request
= &stor_device
->reset_request
;
1361 vstor_packet
= &request
->vstor_packet
;
1363 init_completion(&request
->wait_event
);
1365 vstor_packet
->operation
= VSTOR_OPERATION_RESET_BUS
;
1366 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
1367 vstor_packet
->vm_srb
.path_id
= stor_device
->path_id
;
1369 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
1370 (sizeof(struct vstor_packet
) -
1372 (unsigned long)&stor_device
->reset_request
,
1374 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
1378 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
1380 return TIMEOUT_ERROR
;
1384 * At this point, all outstanding requests in the adapter
1385 * should have been flushed out and return to us
1386 * There is a potential race here where the host may be in
1387 * the process of responding when we return from here.
1388 * Just wait for all in-transit packets to be accounted for
1389 * before we return from here.
1391 storvsc_wait_to_drain(stor_device
);
1396 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd
*scmnd
)
1398 bool allowed
= true;
1399 u8 scsi_op
= scmnd
->cmnd
[0];
1402 /* the host does not handle WRITE_SAME, log accident usage */
1405 * smartd sends this command and the host does not handle
1406 * this. So, don't send it.
1409 scmnd
->result
= ILLEGAL_REQUEST
<< 16;
1418 static int storvsc_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scmnd
)
1421 struct hv_host_device
*host_dev
= shost_priv(host
);
1422 struct hv_device
*dev
= host_dev
->dev
;
1423 struct storvsc_cmd_request
*cmd_request
;
1424 unsigned int request_size
= 0;
1426 struct scatterlist
*sgl
;
1427 unsigned int sg_count
= 0;
1428 struct vmscsi_request
*vm_srb
;
1429 struct stor_mem_pools
*memp
= scmnd
->device
->hostdata
;
1431 if (!storvsc_scsi_cmd_ok(scmnd
)) {
1432 scmnd
->scsi_done(scmnd
);
1436 request_size
= sizeof(struct storvsc_cmd_request
);
1438 cmd_request
= mempool_alloc(memp
->request_mempool
,
1442 * We might be invoked in an interrupt context; hence
1443 * mempool_alloc() can fail.
1446 return SCSI_MLQUEUE_DEVICE_BUSY
;
1448 memset(cmd_request
, 0, sizeof(struct storvsc_cmd_request
));
1450 /* Setup the cmd request */
1451 cmd_request
->cmd
= scmnd
;
1453 scmnd
->host_scribble
= (unsigned char *)cmd_request
;
1455 vm_srb
= &cmd_request
->vstor_packet
.vm_srb
;
1456 vm_srb
->win8_extension
.time_out_value
= 60;
1460 switch (scmnd
->sc_data_direction
) {
1462 vm_srb
->data_in
= WRITE_TYPE
;
1463 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_DATA_OUT
;
1464 vm_srb
->win8_extension
.srb_flags
|=
1465 (SRB_FLAGS_QUEUE_ACTION_ENABLE
|
1466 SRB_FLAGS_DISABLE_SYNCH_TRANSFER
);
1468 case DMA_FROM_DEVICE
:
1469 vm_srb
->data_in
= READ_TYPE
;
1470 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_DATA_IN
;
1471 vm_srb
->win8_extension
.srb_flags
|=
1472 (SRB_FLAGS_QUEUE_ACTION_ENABLE
|
1473 SRB_FLAGS_DISABLE_SYNCH_TRANSFER
);
1476 vm_srb
->data_in
= UNKNOWN_TYPE
;
1477 vm_srb
->win8_extension
.srb_flags
= 0;
1482 vm_srb
->port_number
= host_dev
->port
;
1483 vm_srb
->path_id
= scmnd
->device
->channel
;
1484 vm_srb
->target_id
= scmnd
->device
->id
;
1485 vm_srb
->lun
= scmnd
->device
->lun
;
1487 vm_srb
->cdb_length
= scmnd
->cmd_len
;
1489 memcpy(vm_srb
->cdb
, scmnd
->cmnd
, vm_srb
->cdb_length
);
1491 cmd_request
->sense_buffer
= scmnd
->sense_buffer
;
1494 cmd_request
->data_buffer
.len
= scsi_bufflen(scmnd
);
1495 if (scsi_sg_count(scmnd
)) {
1496 sgl
= (struct scatterlist
*)scsi_sglist(scmnd
);
1497 sg_count
= scsi_sg_count(scmnd
);
1499 /* check if we need to bounce the sgl */
1500 if (do_bounce_buffer(sgl
, scsi_sg_count(scmnd
)) != -1) {
1501 cmd_request
->bounce_sgl
=
1502 create_bounce_buffer(sgl
, scsi_sg_count(scmnd
),
1503 scsi_bufflen(scmnd
),
1505 if (!cmd_request
->bounce_sgl
) {
1506 ret
= SCSI_MLQUEUE_HOST_BUSY
;
1510 cmd_request
->bounce_sgl_count
=
1511 ALIGN(scsi_bufflen(scmnd
), PAGE_SIZE
) >>
1514 if (vm_srb
->data_in
== WRITE_TYPE
)
1515 copy_to_bounce_buffer(sgl
,
1516 cmd_request
->bounce_sgl
,
1517 scsi_sg_count(scmnd
));
1519 sgl
= cmd_request
->bounce_sgl
;
1520 sg_count
= cmd_request
->bounce_sgl_count
;
1523 cmd_request
->data_buffer
.offset
= sgl
[0].offset
;
1525 for (i
= 0; i
< sg_count
; i
++)
1526 cmd_request
->data_buffer
.pfn_array
[i
] =
1527 page_to_pfn(sg_page((&sgl
[i
])));
1529 } else if (scsi_sglist(scmnd
)) {
1530 cmd_request
->data_buffer
.offset
=
1531 virt_to_phys(scsi_sglist(scmnd
)) & (PAGE_SIZE
-1);
1532 cmd_request
->data_buffer
.pfn_array
[0] =
1533 virt_to_phys(scsi_sglist(scmnd
)) >> PAGE_SHIFT
;
1536 /* Invokes the vsc to start an IO */
1537 ret
= storvsc_do_io(dev
, cmd_request
);
1539 if (ret
== -EAGAIN
) {
1542 if (cmd_request
->bounce_sgl_count
) {
1543 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
1544 cmd_request
->bounce_sgl_count
);
1546 ret
= SCSI_MLQUEUE_DEVICE_BUSY
;
1554 mempool_free(cmd_request
, memp
->request_mempool
);
1555 scmnd
->host_scribble
= NULL
;
1559 static struct scsi_host_template scsi_driver
= {
1560 .module
= THIS_MODULE
,
1561 .name
= "storvsc_host_t",
1562 .bios_param
= storvsc_get_chs
,
1563 .queuecommand
= storvsc_queuecommand
,
1564 .eh_host_reset_handler
= storvsc_host_reset_handler
,
1565 .slave_alloc
= storvsc_device_alloc
,
1566 .slave_destroy
= storvsc_device_destroy
,
1567 .slave_configure
= storvsc_device_configure
,
1569 /* 64 max_queue * 1 target */
1570 .can_queue
= STORVSC_MAX_IO_REQUESTS
*STORVSC_MAX_TARGETS
,
1572 /* no use setting to 0 since ll_blk_rw reset it to 1 */
1574 .sg_tablesize
= MAX_MULTIPAGE_BUFFER_COUNT
,
1575 .use_clustering
= DISABLE_CLUSTERING
,
1576 /* Make sure we dont get a sg segment crosses a page boundary */
1577 .dma_boundary
= PAGE_SIZE
-1,
1585 static const struct hv_vmbus_device_id id_table
[] = {
1588 .driver_data
= SCSI_GUID
1592 .driver_data
= IDE_GUID
1597 MODULE_DEVICE_TABLE(vmbus
, id_table
);
1599 static int storvsc_probe(struct hv_device
*device
,
1600 const struct hv_vmbus_device_id
*dev_id
)
1603 struct Scsi_Host
*host
;
1604 struct hv_host_device
*host_dev
;
1605 bool dev_is_ide
= ((dev_id
->driver_data
== IDE_GUID
) ? true : false);
1607 struct storvsc_device
*stor_device
;
1610 * Based on the windows host we are running on,
1611 * set state to properly communicate with the host.
1614 if (vmbus_proto_version
== VERSION_WIN8
) {
1615 sense_buffer_size
= POST_WIN7_STORVSC_SENSE_BUFFER_SIZE
;
1616 vmscsi_size_delta
= 0;
1617 vmstor_current_major
= VMSTOR_WIN8_MAJOR
;
1618 vmstor_current_minor
= VMSTOR_WIN8_MINOR
;
1620 sense_buffer_size
= PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE
;
1621 vmscsi_size_delta
= sizeof(struct vmscsi_win8_extension
);
1622 vmstor_current_major
= VMSTOR_WIN7_MAJOR
;
1623 vmstor_current_minor
= VMSTOR_WIN7_MINOR
;
1627 host
= scsi_host_alloc(&scsi_driver
,
1628 sizeof(struct hv_host_device
));
1632 host_dev
= shost_priv(host
);
1633 memset(host_dev
, 0, sizeof(struct hv_host_device
));
1635 host_dev
->port
= host
->host_no
;
1636 host_dev
->dev
= device
;
1639 stor_device
= kzalloc(sizeof(struct storvsc_device
), GFP_KERNEL
);
1645 stor_device
->destroy
= false;
1646 init_waitqueue_head(&stor_device
->waiting_to_drain
);
1647 stor_device
->device
= device
;
1648 stor_device
->host
= host
;
1649 hv_set_drvdata(device
, stor_device
);
1651 stor_device
->port_number
= host
->host_no
;
1652 ret
= storvsc_connect_to_vsp(device
, storvsc_ringbuffer_size
);
1656 host_dev
->path
= stor_device
->path_id
;
1657 host_dev
->target
= stor_device
->target_id
;
1659 /* max # of devices per target */
1660 host
->max_lun
= STORVSC_MAX_LUNS_PER_TARGET
;
1661 /* max # of targets per channel */
1662 host
->max_id
= STORVSC_MAX_TARGETS
;
1663 /* max # of channels */
1664 host
->max_channel
= STORVSC_MAX_CHANNELS
- 1;
1665 /* max cmd length */
1666 host
->max_cmd_len
= STORVSC_MAX_CMD_LEN
;
1668 /* Register the HBA and start the scsi bus scan */
1669 ret
= scsi_add_host(host
, &device
->device
);
1674 scsi_scan_host(host
);
1676 target
= (device
->dev_instance
.b
[5] << 8 |
1677 device
->dev_instance
.b
[4]);
1678 ret
= scsi_add_device(host
, 0, target
, 0);
1680 scsi_remove_host(host
);
1688 * Once we have connected with the host, we would need to
1689 * to invoke storvsc_dev_remove() to rollback this state and
1690 * this call also frees up the stor_device; hence the jump around
1693 storvsc_dev_remove(device
);
1700 scsi_host_put(host
);
1704 static int storvsc_remove(struct hv_device
*dev
)
1706 struct storvsc_device
*stor_device
= hv_get_drvdata(dev
);
1707 struct Scsi_Host
*host
= stor_device
->host
;
1709 scsi_remove_host(host
);
1710 storvsc_dev_remove(dev
);
1711 scsi_host_put(host
);
1716 static struct hv_driver storvsc_drv
= {
1717 .name
= KBUILD_MODNAME
,
1718 .id_table
= id_table
,
1719 .probe
= storvsc_probe
,
1720 .remove
= storvsc_remove
,
1723 static int __init
storvsc_drv_init(void)
1725 u32 max_outstanding_req_per_channel
;
1728 * Divide the ring buffer data size (which is 1 page less
1729 * than the ring buffer size since that page is reserved for
1730 * the ring buffer indices) by the max request size (which is
1731 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1733 max_outstanding_req_per_channel
=
1734 ((storvsc_ringbuffer_size
- PAGE_SIZE
) /
1735 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET
+
1736 sizeof(struct vstor_packet
) + sizeof(u64
) -
1740 if (max_outstanding_req_per_channel
<
1741 STORVSC_MAX_IO_REQUESTS
)
1744 return vmbus_driver_register(&storvsc_drv
);
1747 static void __exit
storvsc_drv_exit(void)
1749 vmbus_driver_unregister(&storvsc_drv
);
1752 MODULE_LICENSE("GPL");
1753 MODULE_VERSION(HV_DRV_VERSION
);
1754 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
1755 module_init(storvsc_drv_init
);
1756 module_exit(storvsc_drv_exit
);