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/blkdev.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.
311 static int storvsc_ringbuffer_size
= (20 * PAGE_SIZE
);
313 module_param(storvsc_ringbuffer_size
, int, S_IRUGO
);
314 MODULE_PARM_DESC(storvsc_ringbuffer_size
, "Ring buffer size (bytes)");
317 * Timeout in seconds for all devices managed by this driver.
319 static int storvsc_timeout
= 180;
321 static int msft_blist_flags
= BLIST_TRY_VPD_PAGES
;
323 #define STORVSC_MAX_IO_REQUESTS 200
325 static void storvsc_on_channel_callback(void *context
);
327 #define STORVSC_MAX_LUNS_PER_TARGET 255
328 #define STORVSC_MAX_TARGETS 2
329 #define STORVSC_MAX_CHANNELS 8
331 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255
332 #define STORVSC_FC_MAX_TARGETS 128
333 #define STORVSC_FC_MAX_CHANNELS 8
335 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
336 #define STORVSC_IDE_MAX_TARGETS 1
337 #define STORVSC_IDE_MAX_CHANNELS 1
339 struct storvsc_cmd_request
{
340 struct scsi_cmnd
*cmd
;
342 unsigned int bounce_sgl_count
;
343 struct scatterlist
*bounce_sgl
;
345 struct hv_device
*device
;
347 /* Synchronize the request/response if needed */
348 struct completion wait_event
;
350 struct hv_multipage_buffer data_buffer
;
351 struct vstor_packet vstor_packet
;
355 /* A storvsc device is a device object that contains a vmbus channel */
356 struct storvsc_device
{
357 struct hv_device
*device
;
361 bool open_sub_channel
;
362 atomic_t num_outstanding_req
;
363 struct Scsi_Host
*host
;
365 wait_queue_head_t waiting_to_drain
;
368 * Each unique Port/Path/Target represents 1 channel ie scsi
369 * controller. In reality, the pathid, targetid is always 0
370 * and the port is set by us
372 unsigned int port_number
;
373 unsigned char path_id
;
374 unsigned char target_id
;
376 /* Used for vsc/vsp channel reset process */
377 struct storvsc_cmd_request init_request
;
378 struct storvsc_cmd_request reset_request
;
381 struct hv_host_device
{
382 struct hv_device
*dev
;
385 unsigned char target
;
388 struct storvsc_scan_work
{
389 struct work_struct work
;
390 struct Scsi_Host
*host
;
394 static void storvsc_device_scan(struct work_struct
*work
)
396 struct storvsc_scan_work
*wrk
;
398 struct scsi_device
*sdev
;
400 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
403 sdev
= scsi_device_lookup(wrk
->host
, 0, 0, lun
);
406 scsi_rescan_device(&sdev
->sdev_gendev
);
407 scsi_device_put(sdev
);
413 static void storvsc_host_scan(struct work_struct
*work
)
415 struct storvsc_scan_work
*wrk
;
416 struct Scsi_Host
*host
;
417 struct scsi_device
*sdev
;
420 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
424 * Before scanning the host, first check to see if any of the
425 * currrently known devices have been hot removed. We issue a
426 * "unit ready" command against all currently known devices.
427 * This I/O will result in an error for devices that have been
428 * removed. As part of handling the I/O error, we remove the device.
430 * When a LUN is added or removed, the host sends us a signal to
431 * scan the host. Thus we are forced to discover the LUNs that
432 * may have been removed this way.
434 mutex_lock(&host
->scan_mutex
);
435 spin_lock_irqsave(host
->host_lock
, flags
);
436 list_for_each_entry(sdev
, &host
->__devices
, siblings
) {
437 spin_unlock_irqrestore(host
->host_lock
, flags
);
438 scsi_test_unit_ready(sdev
, 1, 1, NULL
);
439 spin_lock_irqsave(host
->host_lock
, flags
);
442 spin_unlock_irqrestore(host
->host_lock
, flags
);
443 mutex_unlock(&host
->scan_mutex
);
445 * Now scan the host to discover LUNs that may have been added.
447 scsi_scan_host(host
);
452 static void storvsc_remove_lun(struct work_struct
*work
)
454 struct storvsc_scan_work
*wrk
;
455 struct scsi_device
*sdev
;
457 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
458 if (!scsi_host_get(wrk
->host
))
461 sdev
= scsi_device_lookup(wrk
->host
, 0, 0, wrk
->lun
);
464 scsi_remove_device(sdev
);
465 scsi_device_put(sdev
);
467 scsi_host_put(wrk
->host
);
474 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
475 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
478 static inline u16
storvsc_get_version(u8 major
, u8 minor
)
482 version
= ((major
<< 8) | minor
);
487 * We can get incoming messages from the host that are not in response to
488 * messages that we have sent out. An example of this would be messages
489 * received by the guest to notify dynamic addition/removal of LUNs. To
490 * deal with potential race conditions where the driver may be in the
491 * midst of being unloaded when we might receive an unsolicited message
492 * from the host, we have implemented a mechanism to gurantee sequential
495 * 1) Once the device is marked as being destroyed, we will fail all
497 * 2) We permit incoming messages when the device is being destroyed,
498 * only to properly account for messages already sent out.
501 static inline struct storvsc_device
*get_out_stor_device(
502 struct hv_device
*device
)
504 struct storvsc_device
*stor_device
;
506 stor_device
= hv_get_drvdata(device
);
508 if (stor_device
&& stor_device
->destroy
)
515 static inline void storvsc_wait_to_drain(struct storvsc_device
*dev
)
517 dev
->drain_notify
= true;
518 wait_event(dev
->waiting_to_drain
,
519 atomic_read(&dev
->num_outstanding_req
) == 0);
520 dev
->drain_notify
= false;
523 static inline struct storvsc_device
*get_in_stor_device(
524 struct hv_device
*device
)
526 struct storvsc_device
*stor_device
;
528 stor_device
= hv_get_drvdata(device
);
534 * If the device is being destroyed; allow incoming
535 * traffic only to cleanup outstanding requests.
538 if (stor_device
->destroy
&&
539 (atomic_read(&stor_device
->num_outstanding_req
) == 0))
547 static void destroy_bounce_buffer(struct scatterlist
*sgl
,
548 unsigned int sg_count
)
551 struct page
*page_buf
;
553 for (i
= 0; i
< sg_count
; i
++) {
554 page_buf
= sg_page((&sgl
[i
]));
555 if (page_buf
!= NULL
)
556 __free_page(page_buf
);
562 static int do_bounce_buffer(struct scatterlist
*sgl
, unsigned int sg_count
)
566 /* No need to check */
570 /* We have at least 2 sg entries */
571 for (i
= 0; i
< sg_count
; i
++) {
573 /* make sure 1st one does not have hole */
574 if (sgl
[i
].offset
+ sgl
[i
].length
!= PAGE_SIZE
)
576 } else if (i
== sg_count
- 1) {
577 /* make sure last one does not have hole */
578 if (sgl
[i
].offset
!= 0)
581 /* make sure no hole in the middle */
582 if (sgl
[i
].length
!= PAGE_SIZE
|| sgl
[i
].offset
!= 0)
589 static struct scatterlist
*create_bounce_buffer(struct scatterlist
*sgl
,
590 unsigned int sg_count
,
596 struct scatterlist
*bounce_sgl
;
597 struct page
*page_buf
;
598 unsigned int buf_len
= ((write
== WRITE_TYPE
) ? 0 : PAGE_SIZE
);
600 num_pages
= ALIGN(len
, PAGE_SIZE
) >> PAGE_SHIFT
;
602 bounce_sgl
= kcalloc(num_pages
, sizeof(struct scatterlist
), GFP_ATOMIC
);
606 sg_init_table(bounce_sgl
, num_pages
);
607 for (i
= 0; i
< num_pages
; i
++) {
608 page_buf
= alloc_page(GFP_ATOMIC
);
611 sg_set_page(&bounce_sgl
[i
], page_buf
, buf_len
, 0);
617 destroy_bounce_buffer(bounce_sgl
, num_pages
);
621 /* Disgusting wrapper functions */
622 static inline unsigned long sg_kmap_atomic(struct scatterlist
*sgl
, int idx
)
624 void *addr
= kmap_atomic(sg_page(sgl
+ idx
));
625 return (unsigned long)addr
;
628 static inline void sg_kunmap_atomic(unsigned long addr
)
630 kunmap_atomic((void *)addr
);
634 /* Assume the original sgl has enough room */
635 static unsigned int copy_from_bounce_buffer(struct scatterlist
*orig_sgl
,
636 struct scatterlist
*bounce_sgl
,
637 unsigned int orig_sgl_count
,
638 unsigned int bounce_sgl_count
)
642 unsigned long src
, dest
;
643 unsigned int srclen
, destlen
, copylen
;
644 unsigned int total_copied
= 0;
645 unsigned long bounce_addr
= 0;
646 unsigned long dest_addr
= 0;
649 local_irq_save(flags
);
651 for (i
= 0; i
< orig_sgl_count
; i
++) {
652 dest_addr
= sg_kmap_atomic(orig_sgl
,i
) + orig_sgl
[i
].offset
;
654 destlen
= orig_sgl
[i
].length
;
656 if (bounce_addr
== 0)
657 bounce_addr
= sg_kmap_atomic(bounce_sgl
,j
);
660 src
= bounce_addr
+ bounce_sgl
[j
].offset
;
661 srclen
= bounce_sgl
[j
].length
- bounce_sgl
[j
].offset
;
663 copylen
= min(srclen
, destlen
);
664 memcpy((void *)dest
, (void *)src
, copylen
);
666 total_copied
+= copylen
;
667 bounce_sgl
[j
].offset
+= copylen
;
671 if (bounce_sgl
[j
].offset
== bounce_sgl
[j
].length
) {
673 sg_kunmap_atomic(bounce_addr
);
677 * It is possible that the number of elements
678 * in the bounce buffer may not be equal to
679 * the number of elements in the original
680 * scatter list. Handle this correctly.
683 if (j
== bounce_sgl_count
) {
685 * We are done; cleanup and return.
687 sg_kunmap_atomic(dest_addr
- orig_sgl
[i
].offset
);
688 local_irq_restore(flags
);
692 /* if we need to use another bounce buffer */
693 if (destlen
|| i
!= orig_sgl_count
- 1)
694 bounce_addr
= sg_kmap_atomic(bounce_sgl
,j
);
695 } else if (destlen
== 0 && i
== orig_sgl_count
- 1) {
696 /* unmap the last bounce that is < PAGE_SIZE */
697 sg_kunmap_atomic(bounce_addr
);
701 sg_kunmap_atomic(dest_addr
- orig_sgl
[i
].offset
);
704 local_irq_restore(flags
);
709 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
710 static unsigned int copy_to_bounce_buffer(struct scatterlist
*orig_sgl
,
711 struct scatterlist
*bounce_sgl
,
712 unsigned int orig_sgl_count
)
716 unsigned long src
, dest
;
717 unsigned int srclen
, destlen
, copylen
;
718 unsigned int total_copied
= 0;
719 unsigned long bounce_addr
= 0;
720 unsigned long src_addr
= 0;
723 local_irq_save(flags
);
725 for (i
= 0; i
< orig_sgl_count
; i
++) {
726 src_addr
= sg_kmap_atomic(orig_sgl
,i
) + orig_sgl
[i
].offset
;
728 srclen
= orig_sgl
[i
].length
;
730 if (bounce_addr
== 0)
731 bounce_addr
= sg_kmap_atomic(bounce_sgl
,j
);
734 /* assume bounce offset always == 0 */
735 dest
= bounce_addr
+ bounce_sgl
[j
].length
;
736 destlen
= PAGE_SIZE
- bounce_sgl
[j
].length
;
738 copylen
= min(srclen
, destlen
);
739 memcpy((void *)dest
, (void *)src
, copylen
);
741 total_copied
+= copylen
;
742 bounce_sgl
[j
].length
+= copylen
;
746 if (bounce_sgl
[j
].length
== PAGE_SIZE
) {
747 /* full..move to next entry */
748 sg_kunmap_atomic(bounce_addr
);
751 /* if we need to use another bounce buffer */
752 if (srclen
|| i
!= orig_sgl_count
- 1)
753 bounce_addr
= sg_kmap_atomic(bounce_sgl
,j
);
755 } else if (srclen
== 0 && i
== orig_sgl_count
- 1) {
756 /* unmap the last bounce that is < PAGE_SIZE */
757 sg_kunmap_atomic(bounce_addr
);
761 sg_kunmap_atomic(src_addr
- orig_sgl
[i
].offset
);
764 local_irq_restore(flags
);
769 static void handle_sc_creation(struct vmbus_channel
*new_sc
)
771 struct hv_device
*device
= new_sc
->primary_channel
->device_obj
;
772 struct storvsc_device
*stor_device
;
773 struct vmstorage_channel_properties props
;
775 stor_device
= get_out_stor_device(device
);
779 if (stor_device
->open_sub_channel
== false)
782 memset(&props
, 0, sizeof(struct vmstorage_channel_properties
));
785 storvsc_ringbuffer_size
,
786 storvsc_ringbuffer_size
,
788 sizeof(struct vmstorage_channel_properties
),
789 storvsc_on_channel_callback
, new_sc
);
792 static void handle_multichannel_storage(struct hv_device
*device
, int max_chns
)
794 struct storvsc_device
*stor_device
;
795 int num_cpus
= num_online_cpus();
797 struct storvsc_cmd_request
*request
;
798 struct vstor_packet
*vstor_packet
;
801 num_sc
= ((max_chns
> num_cpus
) ? num_cpus
: max_chns
);
802 stor_device
= get_out_stor_device(device
);
806 request
= &stor_device
->init_request
;
807 vstor_packet
= &request
->vstor_packet
;
809 stor_device
->open_sub_channel
= true;
811 * Establish a handler for dealing with subchannels.
813 vmbus_set_sc_create_callback(device
->channel
, handle_sc_creation
);
816 * Check to see if sub-channels have already been created. This
817 * can happen when this driver is re-loaded after unloading.
820 if (vmbus_are_subchannels_present(device
->channel
))
823 stor_device
->open_sub_channel
= false;
825 * Request the host to create sub-channels.
827 memset(request
, 0, sizeof(struct storvsc_cmd_request
));
828 init_completion(&request
->wait_event
);
829 vstor_packet
->operation
= VSTOR_OPERATION_CREATE_SUB_CHANNELS
;
830 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
831 vstor_packet
->sub_channel_count
= num_sc
;
833 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
834 (sizeof(struct vstor_packet
) -
836 (unsigned long)request
,
838 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
843 t
= wait_for_completion_timeout(&request
->wait_event
, 10*HZ
);
847 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
848 vstor_packet
->status
!= 0)
852 * Now that we created the sub-channels, invoke the check; this
853 * may trigger the callback.
855 stor_device
->open_sub_channel
= true;
856 vmbus_are_subchannels_present(device
->channel
);
859 static int storvsc_channel_init(struct hv_device
*device
)
861 struct storvsc_device
*stor_device
;
862 struct storvsc_cmd_request
*request
;
863 struct vstor_packet
*vstor_packet
;
866 bool process_sub_channels
= false;
868 stor_device
= get_out_stor_device(device
);
872 request
= &stor_device
->init_request
;
873 vstor_packet
= &request
->vstor_packet
;
876 * Now, initiate the vsc/vsp initialization protocol on the open
879 memset(request
, 0, sizeof(struct storvsc_cmd_request
));
880 init_completion(&request
->wait_event
);
881 vstor_packet
->operation
= VSTOR_OPERATION_BEGIN_INITIALIZATION
;
882 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
884 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
885 (sizeof(struct vstor_packet
) -
887 (unsigned long)request
,
889 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
893 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
899 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
900 vstor_packet
->status
!= 0)
904 /* reuse the packet for version range supported */
905 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
906 vstor_packet
->operation
= VSTOR_OPERATION_QUERY_PROTOCOL_VERSION
;
907 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
909 vstor_packet
->version
.major_minor
=
910 storvsc_get_version(vmstor_current_major
, vmstor_current_minor
);
913 * The revision number is only used in Windows; set it to 0.
915 vstor_packet
->version
.revision
= 0;
917 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
918 (sizeof(struct vstor_packet
) -
920 (unsigned long)request
,
922 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
926 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
932 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
933 vstor_packet
->status
!= 0)
937 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
938 vstor_packet
->operation
= VSTOR_OPERATION_QUERY_PROPERTIES
;
939 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
941 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
942 (sizeof(struct vstor_packet
) -
944 (unsigned long)request
,
946 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
951 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
957 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
958 vstor_packet
->status
!= 0)
962 * Check to see if multi-channel support is there.
963 * Hosts that implement protocol version of 5.1 and above
964 * support multi-channel.
966 max_chns
= vstor_packet
->storage_channel_properties
.max_channel_cnt
;
967 if ((vmbus_proto_version
!= VERSION_WIN7
) &&
968 (vmbus_proto_version
!= VERSION_WS2008
)) {
969 if (vstor_packet
->storage_channel_properties
.flags
&
970 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL
)
971 process_sub_channels
= true;
974 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
975 vstor_packet
->operation
= VSTOR_OPERATION_END_INITIALIZATION
;
976 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
978 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
979 (sizeof(struct vstor_packet
) -
981 (unsigned long)request
,
983 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
988 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
994 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
995 vstor_packet
->status
!= 0)
998 if (process_sub_channels
)
999 handle_multichannel_storage(device
, max_chns
);
1006 static void storvsc_handle_error(struct vmscsi_request
*vm_srb
,
1007 struct scsi_cmnd
*scmnd
,
1008 struct Scsi_Host
*host
,
1011 struct storvsc_scan_work
*wrk
;
1012 void (*process_err_fn
)(struct work_struct
*work
);
1013 bool do_work
= false;
1015 switch (vm_srb
->srb_status
) {
1016 case SRB_STATUS_ERROR
:
1018 * If there is an error; offline the device since all
1019 * error recovery strategies would have already been
1020 * deployed on the host side. However, if the command
1021 * were a pass-through command deal with it appropriately.
1023 switch (scmnd
->cmnd
[0]) {
1026 set_host_byte(scmnd
, DID_PASSTHROUGH
);
1029 * On Some Windows hosts TEST_UNIT_READY command can return
1030 * SRB_STATUS_ERROR, let the upper level code deal with it
1031 * based on the sense information.
1033 case TEST_UNIT_READY
:
1036 set_host_byte(scmnd
, DID_TARGET_FAILURE
);
1039 case SRB_STATUS_INVALID_LUN
:
1041 process_err_fn
= storvsc_remove_lun
;
1043 case (SRB_STATUS_ABORTED
| SRB_STATUS_AUTOSENSE_VALID
):
1044 if ((asc
== 0x2a) && (ascq
== 0x9)) {
1046 process_err_fn
= storvsc_device_scan
;
1048 * Retry the I/O that trigerred this.
1050 set_host_byte(scmnd
, DID_REQUEUE
);
1059 * We need to schedule work to process this error; schedule it.
1061 wrk
= kmalloc(sizeof(struct storvsc_scan_work
), GFP_ATOMIC
);
1063 set_host_byte(scmnd
, DID_TARGET_FAILURE
);
1068 wrk
->lun
= vm_srb
->lun
;
1069 INIT_WORK(&wrk
->work
, process_err_fn
);
1070 schedule_work(&wrk
->work
);
1074 static void storvsc_command_completion(struct storvsc_cmd_request
*cmd_request
)
1076 struct scsi_cmnd
*scmnd
= cmd_request
->cmd
;
1077 struct hv_host_device
*host_dev
= shost_priv(scmnd
->device
->host
);
1078 struct scsi_sense_hdr sense_hdr
;
1079 struct vmscsi_request
*vm_srb
;
1080 struct Scsi_Host
*host
;
1081 struct storvsc_device
*stor_dev
;
1082 struct hv_device
*dev
= host_dev
->dev
;
1084 stor_dev
= get_in_stor_device(dev
);
1085 host
= stor_dev
->host
;
1087 vm_srb
= &cmd_request
->vstor_packet
.vm_srb
;
1088 if (cmd_request
->bounce_sgl_count
) {
1089 if (vm_srb
->data_in
== READ_TYPE
)
1090 copy_from_bounce_buffer(scsi_sglist(scmnd
),
1091 cmd_request
->bounce_sgl
,
1092 scsi_sg_count(scmnd
),
1093 cmd_request
->bounce_sgl_count
);
1094 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
1095 cmd_request
->bounce_sgl_count
);
1098 scmnd
->result
= vm_srb
->scsi_status
;
1100 if (scmnd
->result
) {
1101 if (scsi_normalize_sense(scmnd
->sense_buffer
,
1102 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
1103 scsi_print_sense_hdr(scmnd
->device
, "storvsc",
1107 if (vm_srb
->srb_status
!= SRB_STATUS_SUCCESS
)
1108 storvsc_handle_error(vm_srb
, scmnd
, host
, sense_hdr
.asc
,
1111 scsi_set_resid(scmnd
,
1112 cmd_request
->data_buffer
.len
-
1113 vm_srb
->data_transfer_length
);
1115 scmnd
->scsi_done(scmnd
);
1118 static void storvsc_on_io_completion(struct hv_device
*device
,
1119 struct vstor_packet
*vstor_packet
,
1120 struct storvsc_cmd_request
*request
)
1122 struct storvsc_device
*stor_device
;
1123 struct vstor_packet
*stor_pkt
;
1125 stor_device
= hv_get_drvdata(device
);
1126 stor_pkt
= &request
->vstor_packet
;
1129 * The current SCSI handling on the host side does
1130 * not correctly handle:
1131 * INQUIRY command with page code parameter set to 0x80
1132 * MODE_SENSE command with cmd[2] == 0x1c
1134 * Setup srb and scsi status so this won't be fatal.
1135 * We do this so we can distinguish truly fatal failues
1136 * (srb status == 0x4) and off-line the device in that case.
1139 if ((stor_pkt
->vm_srb
.cdb
[0] == INQUIRY
) ||
1140 (stor_pkt
->vm_srb
.cdb
[0] == MODE_SENSE
)) {
1141 vstor_packet
->vm_srb
.scsi_status
= 0;
1142 vstor_packet
->vm_srb
.srb_status
= SRB_STATUS_SUCCESS
;
1146 /* Copy over the status...etc */
1147 stor_pkt
->vm_srb
.scsi_status
= vstor_packet
->vm_srb
.scsi_status
;
1148 stor_pkt
->vm_srb
.srb_status
= vstor_packet
->vm_srb
.srb_status
;
1149 stor_pkt
->vm_srb
.sense_info_length
=
1150 vstor_packet
->vm_srb
.sense_info_length
;
1153 if ((vstor_packet
->vm_srb
.scsi_status
& 0xFF) == 0x02) {
1154 /* CHECK_CONDITION */
1155 if (vstor_packet
->vm_srb
.srb_status
&
1156 SRB_STATUS_AUTOSENSE_VALID
) {
1157 /* autosense data available */
1159 memcpy(request
->cmd
->sense_buffer
,
1160 vstor_packet
->vm_srb
.sense_data
,
1161 vstor_packet
->vm_srb
.sense_info_length
);
1166 stor_pkt
->vm_srb
.data_transfer_length
=
1167 vstor_packet
->vm_srb
.data_transfer_length
;
1169 storvsc_command_completion(request
);
1171 if (atomic_dec_and_test(&stor_device
->num_outstanding_req
) &&
1172 stor_device
->drain_notify
)
1173 wake_up(&stor_device
->waiting_to_drain
);
1178 static void storvsc_on_receive(struct hv_device
*device
,
1179 struct vstor_packet
*vstor_packet
,
1180 struct storvsc_cmd_request
*request
)
1182 struct storvsc_scan_work
*work
;
1183 struct storvsc_device
*stor_device
;
1185 switch (vstor_packet
->operation
) {
1186 case VSTOR_OPERATION_COMPLETE_IO
:
1187 storvsc_on_io_completion(device
, vstor_packet
, request
);
1190 case VSTOR_OPERATION_REMOVE_DEVICE
:
1191 case VSTOR_OPERATION_ENUMERATE_BUS
:
1192 stor_device
= get_in_stor_device(device
);
1193 work
= kmalloc(sizeof(struct storvsc_scan_work
), GFP_ATOMIC
);
1197 INIT_WORK(&work
->work
, storvsc_host_scan
);
1198 work
->host
= stor_device
->host
;
1199 schedule_work(&work
->work
);
1207 static void storvsc_on_channel_callback(void *context
)
1209 struct vmbus_channel
*channel
= (struct vmbus_channel
*)context
;
1210 struct hv_device
*device
;
1211 struct storvsc_device
*stor_device
;
1214 unsigned char packet
[ALIGN(sizeof(struct vstor_packet
), 8)];
1215 struct storvsc_cmd_request
*request
;
1218 if (channel
->primary_channel
!= NULL
)
1219 device
= channel
->primary_channel
->device_obj
;
1221 device
= channel
->device_obj
;
1223 stor_device
= get_in_stor_device(device
);
1228 ret
= vmbus_recvpacket(channel
, packet
,
1229 ALIGN((sizeof(struct vstor_packet
) -
1230 vmscsi_size_delta
), 8),
1231 &bytes_recvd
, &request_id
);
1232 if (ret
== 0 && bytes_recvd
> 0) {
1234 request
= (struct storvsc_cmd_request
*)
1235 (unsigned long)request_id
;
1237 if ((request
== &stor_device
->init_request
) ||
1238 (request
== &stor_device
->reset_request
)) {
1240 memcpy(&request
->vstor_packet
, packet
,
1241 (sizeof(struct vstor_packet
) -
1242 vmscsi_size_delta
));
1243 complete(&request
->wait_event
);
1245 storvsc_on_receive(device
,
1246 (struct vstor_packet
*)packet
,
1257 static int storvsc_connect_to_vsp(struct hv_device
*device
, u32 ring_size
)
1259 struct vmstorage_channel_properties props
;
1262 memset(&props
, 0, sizeof(struct vmstorage_channel_properties
));
1264 ret
= vmbus_open(device
->channel
,
1268 sizeof(struct vmstorage_channel_properties
),
1269 storvsc_on_channel_callback
, device
->channel
);
1274 ret
= storvsc_channel_init(device
);
1279 static int storvsc_dev_remove(struct hv_device
*device
)
1281 struct storvsc_device
*stor_device
;
1282 unsigned long flags
;
1284 stor_device
= hv_get_drvdata(device
);
1286 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
1287 stor_device
->destroy
= true;
1288 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
1291 * At this point, all outbound traffic should be disable. We
1292 * only allow inbound traffic (responses) to proceed so that
1293 * outstanding requests can be completed.
1296 storvsc_wait_to_drain(stor_device
);
1299 * Since we have already drained, we don't need to busy wait
1300 * as was done in final_release_stor_device()
1301 * Note that we cannot set the ext pointer to NULL until
1302 * we have drained - to drain the outgoing packets, we need to
1303 * allow incoming packets.
1305 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
1306 hv_set_drvdata(device
, NULL
);
1307 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
1309 /* Close the channel */
1310 vmbus_close(device
->channel
);
1316 static int storvsc_do_io(struct hv_device
*device
,
1317 struct storvsc_cmd_request
*request
)
1319 struct storvsc_device
*stor_device
;
1320 struct vstor_packet
*vstor_packet
;
1321 struct vmbus_channel
*outgoing_channel
;
1324 vstor_packet
= &request
->vstor_packet
;
1325 stor_device
= get_out_stor_device(device
);
1331 request
->device
= device
;
1333 * Select an an appropriate channel to send the request out.
1336 outgoing_channel
= vmbus_get_outgoing_channel(device
->channel
);
1339 vstor_packet
->flags
|= REQUEST_COMPLETION_FLAG
;
1341 vstor_packet
->vm_srb
.length
= (sizeof(struct vmscsi_request
) -
1345 vstor_packet
->vm_srb
.sense_info_length
= sense_buffer_size
;
1348 vstor_packet
->vm_srb
.data_transfer_length
=
1349 request
->data_buffer
.len
;
1351 vstor_packet
->operation
= VSTOR_OPERATION_EXECUTE_SRB
;
1353 if (request
->data_buffer
.len
) {
1354 ret
= vmbus_sendpacket_multipagebuffer(outgoing_channel
,
1355 &request
->data_buffer
,
1357 (sizeof(struct vstor_packet
) -
1359 (unsigned long)request
);
1361 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
1362 (sizeof(struct vstor_packet
) -
1364 (unsigned long)request
,
1366 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
1372 atomic_inc(&stor_device
->num_outstanding_req
);
1377 static int storvsc_device_configure(struct scsi_device
*sdevice
)
1379 scsi_change_queue_depth(sdevice
, STORVSC_MAX_IO_REQUESTS
);
1381 blk_queue_max_segment_size(sdevice
->request_queue
, PAGE_SIZE
);
1383 blk_queue_bounce_limit(sdevice
->request_queue
, BLK_BOUNCE_ANY
);
1385 blk_queue_rq_timeout(sdevice
->request_queue
, (storvsc_timeout
* HZ
));
1387 sdevice
->no_write_same
= 1;
1390 * Add blist flags to permit the reading of the VPD pages even when
1391 * the target may claim SPC-2 compliance. MSFT targets currently
1392 * claim SPC-2 compliance while they implement post SPC-2 features.
1393 * With this patch we can correctly handle WRITE_SAME_16 issues.
1395 sdevice
->sdev_bflags
|= msft_blist_flags
;
1398 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
1399 * if the device is a MSFT virtual device.
1401 if (!strncmp(sdevice
->vendor
, "Msft", 4)) {
1402 switch (vmbus_proto_version
) {
1404 case VERSION_WIN8_1
:
1405 sdevice
->scsi_level
= SCSI_SPC_3
;
1413 static int storvsc_get_chs(struct scsi_device
*sdev
, struct block_device
* bdev
,
1414 sector_t capacity
, int *info
)
1416 sector_t nsect
= capacity
;
1417 sector_t cylinders
= nsect
;
1418 int heads
, sectors_pt
;
1421 * We are making up these values; let us keep it simple.
1424 sectors_pt
= 0x3f; /* Sectors per track */
1425 sector_div(cylinders
, heads
* sectors_pt
);
1426 if ((sector_t
)(cylinders
+ 1) * heads
* sectors_pt
< nsect
)
1430 info
[1] = sectors_pt
;
1431 info
[2] = (int)cylinders
;
1436 static int storvsc_host_reset_handler(struct scsi_cmnd
*scmnd
)
1438 struct hv_host_device
*host_dev
= shost_priv(scmnd
->device
->host
);
1439 struct hv_device
*device
= host_dev
->dev
;
1441 struct storvsc_device
*stor_device
;
1442 struct storvsc_cmd_request
*request
;
1443 struct vstor_packet
*vstor_packet
;
1447 stor_device
= get_out_stor_device(device
);
1451 request
= &stor_device
->reset_request
;
1452 vstor_packet
= &request
->vstor_packet
;
1454 init_completion(&request
->wait_event
);
1456 vstor_packet
->operation
= VSTOR_OPERATION_RESET_BUS
;
1457 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
1458 vstor_packet
->vm_srb
.path_id
= stor_device
->path_id
;
1460 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
1461 (sizeof(struct vstor_packet
) -
1463 (unsigned long)&stor_device
->reset_request
,
1465 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
1469 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
1471 return TIMEOUT_ERROR
;
1475 * At this point, all outstanding requests in the adapter
1476 * should have been flushed out and return to us
1477 * There is a potential race here where the host may be in
1478 * the process of responding when we return from here.
1479 * Just wait for all in-transit packets to be accounted for
1480 * before we return from here.
1482 storvsc_wait_to_drain(stor_device
);
1488 * The host guarantees to respond to each command, although I/O latencies might
1489 * be unbounded on Azure. Reset the timer unconditionally to give the host a
1490 * chance to perform EH.
1492 static enum blk_eh_timer_return
storvsc_eh_timed_out(struct scsi_cmnd
*scmnd
)
1494 return BLK_EH_RESET_TIMER
;
1497 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd
*scmnd
)
1499 bool allowed
= true;
1500 u8 scsi_op
= scmnd
->cmnd
[0];
1503 /* the host does not handle WRITE_SAME, log accident usage */
1506 * smartd sends this command and the host does not handle
1507 * this. So, don't send it.
1510 scmnd
->result
= ILLEGAL_REQUEST
<< 16;
1519 static int storvsc_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scmnd
)
1522 struct hv_host_device
*host_dev
= shost_priv(host
);
1523 struct hv_device
*dev
= host_dev
->dev
;
1524 struct storvsc_cmd_request
*cmd_request
= scsi_cmd_priv(scmnd
);
1526 struct scatterlist
*sgl
;
1527 unsigned int sg_count
= 0;
1528 struct vmscsi_request
*vm_srb
;
1530 if (vmstor_current_major
<= VMSTOR_WIN8_MAJOR
) {
1532 * On legacy hosts filter unimplemented commands.
1533 * Future hosts are expected to correctly handle
1534 * unsupported commands. Furthermore, it is
1535 * possible that some of the currently
1536 * unsupported commands maybe supported in
1537 * future versions of the host.
1539 if (!storvsc_scsi_cmd_ok(scmnd
)) {
1540 scmnd
->scsi_done(scmnd
);
1545 /* Setup the cmd request */
1546 cmd_request
->cmd
= scmnd
;
1548 vm_srb
= &cmd_request
->vstor_packet
.vm_srb
;
1549 vm_srb
->win8_extension
.time_out_value
= 60;
1551 vm_srb
->win8_extension
.srb_flags
|=
1552 (SRB_FLAGS_QUEUE_ACTION_ENABLE
|
1553 SRB_FLAGS_DISABLE_SYNCH_TRANSFER
);
1556 switch (scmnd
->sc_data_direction
) {
1558 vm_srb
->data_in
= WRITE_TYPE
;
1559 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_DATA_OUT
;
1561 case DMA_FROM_DEVICE
:
1562 vm_srb
->data_in
= READ_TYPE
;
1563 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_DATA_IN
;
1566 vm_srb
->data_in
= UNKNOWN_TYPE
;
1567 vm_srb
->win8_extension
.srb_flags
|= (SRB_FLAGS_DATA_IN
|
1568 SRB_FLAGS_DATA_OUT
);
1573 vm_srb
->port_number
= host_dev
->port
;
1574 vm_srb
->path_id
= scmnd
->device
->channel
;
1575 vm_srb
->target_id
= scmnd
->device
->id
;
1576 vm_srb
->lun
= scmnd
->device
->lun
;
1578 vm_srb
->cdb_length
= scmnd
->cmd_len
;
1580 memcpy(vm_srb
->cdb
, scmnd
->cmnd
, vm_srb
->cdb_length
);
1582 cmd_request
->data_buffer
.len
= scsi_bufflen(scmnd
);
1583 if (scsi_sg_count(scmnd
)) {
1584 sgl
= (struct scatterlist
*)scsi_sglist(scmnd
);
1585 sg_count
= scsi_sg_count(scmnd
);
1587 /* check if we need to bounce the sgl */
1588 if (do_bounce_buffer(sgl
, scsi_sg_count(scmnd
)) != -1) {
1589 cmd_request
->bounce_sgl
=
1590 create_bounce_buffer(sgl
, scsi_sg_count(scmnd
),
1591 scsi_bufflen(scmnd
),
1593 if (!cmd_request
->bounce_sgl
)
1594 return SCSI_MLQUEUE_HOST_BUSY
;
1596 cmd_request
->bounce_sgl_count
=
1597 ALIGN(scsi_bufflen(scmnd
), PAGE_SIZE
) >>
1600 if (vm_srb
->data_in
== WRITE_TYPE
)
1601 copy_to_bounce_buffer(sgl
,
1602 cmd_request
->bounce_sgl
,
1603 scsi_sg_count(scmnd
));
1605 sgl
= cmd_request
->bounce_sgl
;
1606 sg_count
= cmd_request
->bounce_sgl_count
;
1609 cmd_request
->data_buffer
.offset
= sgl
[0].offset
;
1611 for (i
= 0; i
< sg_count
; i
++)
1612 cmd_request
->data_buffer
.pfn_array
[i
] =
1613 page_to_pfn(sg_page((&sgl
[i
])));
1615 } else if (scsi_sglist(scmnd
)) {
1616 cmd_request
->data_buffer
.offset
=
1617 virt_to_phys(scsi_sglist(scmnd
)) & (PAGE_SIZE
-1);
1618 cmd_request
->data_buffer
.pfn_array
[0] =
1619 virt_to_phys(scsi_sglist(scmnd
)) >> PAGE_SHIFT
;
1622 /* Invokes the vsc to start an IO */
1623 ret
= storvsc_do_io(dev
, cmd_request
);
1625 if (ret
== -EAGAIN
) {
1628 if (cmd_request
->bounce_sgl_count
)
1629 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
1630 cmd_request
->bounce_sgl_count
);
1632 return SCSI_MLQUEUE_DEVICE_BUSY
;
1638 static struct scsi_host_template scsi_driver
= {
1639 .module
= THIS_MODULE
,
1640 .name
= "storvsc_host_t",
1641 .cmd_size
= sizeof(struct storvsc_cmd_request
),
1642 .bios_param
= storvsc_get_chs
,
1643 .queuecommand
= storvsc_queuecommand
,
1644 .eh_host_reset_handler
= storvsc_host_reset_handler
,
1645 .proc_name
= "storvsc_host",
1646 .eh_timed_out
= storvsc_eh_timed_out
,
1647 .slave_configure
= storvsc_device_configure
,
1649 .can_queue
= STORVSC_MAX_IO_REQUESTS
*STORVSC_MAX_TARGETS
,
1651 /* no use setting to 0 since ll_blk_rw reset it to 1 */
1653 .sg_tablesize
= MAX_MULTIPAGE_BUFFER_COUNT
,
1654 .use_clustering
= DISABLE_CLUSTERING
,
1655 /* Make sure we dont get a sg segment crosses a page boundary */
1656 .dma_boundary
= PAGE_SIZE
-1,
1666 static const struct hv_vmbus_device_id id_table
[] = {
1669 .driver_data
= SCSI_GUID
1673 .driver_data
= IDE_GUID
1675 /* Fibre Channel GUID */
1678 .driver_data
= SFC_GUID
1683 MODULE_DEVICE_TABLE(vmbus
, id_table
);
1685 static int storvsc_probe(struct hv_device
*device
,
1686 const struct hv_vmbus_device_id
*dev_id
)
1689 struct Scsi_Host
*host
;
1690 struct hv_host_device
*host_dev
;
1691 bool dev_is_ide
= ((dev_id
->driver_data
== IDE_GUID
) ? true : false);
1693 struct storvsc_device
*stor_device
;
1694 int max_luns_per_target
;
1699 * Based on the windows host we are running on,
1700 * set state to properly communicate with the host.
1703 switch (vmbus_proto_version
) {
1704 case VERSION_WS2008
:
1706 sense_buffer_size
= PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE
;
1707 vmscsi_size_delta
= sizeof(struct vmscsi_win8_extension
);
1708 vmstor_current_major
= VMSTOR_WIN7_MAJOR
;
1709 vmstor_current_minor
= VMSTOR_WIN7_MINOR
;
1710 max_luns_per_target
= STORVSC_IDE_MAX_LUNS_PER_TARGET
;
1711 max_targets
= STORVSC_IDE_MAX_TARGETS
;
1712 max_channels
= STORVSC_IDE_MAX_CHANNELS
;
1715 sense_buffer_size
= POST_WIN7_STORVSC_SENSE_BUFFER_SIZE
;
1716 vmscsi_size_delta
= 0;
1717 vmstor_current_major
= VMSTOR_WIN8_MAJOR
;
1718 vmstor_current_minor
= VMSTOR_WIN8_MINOR
;
1719 max_luns_per_target
= STORVSC_MAX_LUNS_PER_TARGET
;
1720 max_targets
= STORVSC_MAX_TARGETS
;
1721 max_channels
= STORVSC_MAX_CHANNELS
;
1725 if (dev_id
->driver_data
== SFC_GUID
)
1726 scsi_driver
.can_queue
= (STORVSC_MAX_IO_REQUESTS
*
1727 STORVSC_FC_MAX_TARGETS
);
1728 host
= scsi_host_alloc(&scsi_driver
,
1729 sizeof(struct hv_host_device
));
1733 host_dev
= shost_priv(host
);
1734 memset(host_dev
, 0, sizeof(struct hv_host_device
));
1736 host_dev
->port
= host
->host_no
;
1737 host_dev
->dev
= device
;
1740 stor_device
= kzalloc(sizeof(struct storvsc_device
), GFP_KERNEL
);
1746 stor_device
->destroy
= false;
1747 stor_device
->open_sub_channel
= false;
1748 init_waitqueue_head(&stor_device
->waiting_to_drain
);
1749 stor_device
->device
= device
;
1750 stor_device
->host
= host
;
1751 hv_set_drvdata(device
, stor_device
);
1753 stor_device
->port_number
= host
->host_no
;
1754 ret
= storvsc_connect_to_vsp(device
, storvsc_ringbuffer_size
);
1758 host_dev
->path
= stor_device
->path_id
;
1759 host_dev
->target
= stor_device
->target_id
;
1761 switch (dev_id
->driver_data
) {
1763 host
->max_lun
= STORVSC_FC_MAX_LUNS_PER_TARGET
;
1764 host
->max_id
= STORVSC_FC_MAX_TARGETS
;
1765 host
->max_channel
= STORVSC_FC_MAX_CHANNELS
- 1;
1769 host
->max_lun
= max_luns_per_target
;
1770 host
->max_id
= max_targets
;
1771 host
->max_channel
= max_channels
- 1;
1775 host
->max_lun
= STORVSC_IDE_MAX_LUNS_PER_TARGET
;
1776 host
->max_id
= STORVSC_IDE_MAX_TARGETS
;
1777 host
->max_channel
= STORVSC_IDE_MAX_CHANNELS
- 1;
1780 /* max cmd length */
1781 host
->max_cmd_len
= STORVSC_MAX_CMD_LEN
;
1783 /* Register the HBA and start the scsi bus scan */
1784 ret
= scsi_add_host(host
, &device
->device
);
1789 scsi_scan_host(host
);
1791 target
= (device
->dev_instance
.b
[5] << 8 |
1792 device
->dev_instance
.b
[4]);
1793 ret
= scsi_add_device(host
, 0, target
, 0);
1795 scsi_remove_host(host
);
1803 * Once we have connected with the host, we would need to
1804 * to invoke storvsc_dev_remove() to rollback this state and
1805 * this call also frees up the stor_device; hence the jump around
1808 storvsc_dev_remove(device
);
1815 scsi_host_put(host
);
1819 static int storvsc_remove(struct hv_device
*dev
)
1821 struct storvsc_device
*stor_device
= hv_get_drvdata(dev
);
1822 struct Scsi_Host
*host
= stor_device
->host
;
1824 scsi_remove_host(host
);
1825 storvsc_dev_remove(dev
);
1826 scsi_host_put(host
);
1831 static struct hv_driver storvsc_drv
= {
1832 .name
= KBUILD_MODNAME
,
1833 .id_table
= id_table
,
1834 .probe
= storvsc_probe
,
1835 .remove
= storvsc_remove
,
1838 static int __init
storvsc_drv_init(void)
1840 u32 max_outstanding_req_per_channel
;
1843 * Divide the ring buffer data size (which is 1 page less
1844 * than the ring buffer size since that page is reserved for
1845 * the ring buffer indices) by the max request size (which is
1846 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1848 max_outstanding_req_per_channel
=
1849 ((storvsc_ringbuffer_size
- PAGE_SIZE
) /
1850 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET
+
1851 sizeof(struct vstor_packet
) + sizeof(u64
) -
1855 if (max_outstanding_req_per_channel
<
1856 STORVSC_MAX_IO_REQUESTS
)
1859 return vmbus_driver_register(&storvsc_drv
);
1862 static void __exit
storvsc_drv_exit(void)
1864 vmbus_driver_unregister(&storvsc_drv
);
1867 MODULE_LICENSE("GPL");
1868 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
1869 module_init(storvsc_drv_init
);
1870 module_exit(storvsc_drv_exit
);