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
= (256 * PAGE_SIZE
);
312 static u32 max_outstanding_req_per_channel
;
314 static int storvsc_vcpus_per_sub_channel
= 4;
316 module_param(storvsc_ringbuffer_size
, int, S_IRUGO
);
317 MODULE_PARM_DESC(storvsc_ringbuffer_size
, "Ring buffer size (bytes)");
319 module_param(storvsc_vcpus_per_sub_channel
, int, S_IRUGO
);
320 MODULE_PARM_DESC(vcpus_per_sub_channel
, "Ratio of VCPUs to subchannels");
322 * Timeout in seconds for all devices managed by this driver.
324 static int storvsc_timeout
= 180;
326 static int msft_blist_flags
= BLIST_TRY_VPD_PAGES
;
329 static void storvsc_on_channel_callback(void *context
);
331 #define STORVSC_MAX_LUNS_PER_TARGET 255
332 #define STORVSC_MAX_TARGETS 2
333 #define STORVSC_MAX_CHANNELS 8
335 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255
336 #define STORVSC_FC_MAX_TARGETS 128
337 #define STORVSC_FC_MAX_CHANNELS 8
339 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
340 #define STORVSC_IDE_MAX_TARGETS 1
341 #define STORVSC_IDE_MAX_CHANNELS 1
343 struct storvsc_cmd_request
{
344 struct scsi_cmnd
*cmd
;
346 unsigned int bounce_sgl_count
;
347 struct scatterlist
*bounce_sgl
;
349 struct hv_device
*device
;
351 /* Synchronize the request/response if needed */
352 struct completion wait_event
;
354 struct vmbus_channel_packet_multipage_buffer mpb
;
355 struct vmbus_packet_mpb_array
*payload
;
358 struct vstor_packet vstor_packet
;
362 /* A storvsc device is a device object that contains a vmbus channel */
363 struct storvsc_device
{
364 struct hv_device
*device
;
368 bool open_sub_channel
;
369 atomic_t num_outstanding_req
;
370 struct Scsi_Host
*host
;
372 wait_queue_head_t waiting_to_drain
;
375 * Each unique Port/Path/Target represents 1 channel ie scsi
376 * controller. In reality, the pathid, targetid is always 0
377 * and the port is set by us
379 unsigned int port_number
;
380 unsigned char path_id
;
381 unsigned char target_id
;
384 * Max I/O, the device can support.
386 u32 max_transfer_bytes
;
387 /* Used for vsc/vsp channel reset process */
388 struct storvsc_cmd_request init_request
;
389 struct storvsc_cmd_request reset_request
;
392 struct hv_host_device
{
393 struct hv_device
*dev
;
396 unsigned char target
;
399 struct storvsc_scan_work
{
400 struct work_struct work
;
401 struct Scsi_Host
*host
;
405 static void storvsc_device_scan(struct work_struct
*work
)
407 struct storvsc_scan_work
*wrk
;
409 struct scsi_device
*sdev
;
411 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
414 sdev
= scsi_device_lookup(wrk
->host
, 0, 0, lun
);
417 scsi_rescan_device(&sdev
->sdev_gendev
);
418 scsi_device_put(sdev
);
424 static void storvsc_host_scan(struct work_struct
*work
)
426 struct storvsc_scan_work
*wrk
;
427 struct Scsi_Host
*host
;
428 struct scsi_device
*sdev
;
430 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
434 * Before scanning the host, first check to see if any of the
435 * currrently known devices have been hot removed. We issue a
436 * "unit ready" command against all currently known devices.
437 * This I/O will result in an error for devices that have been
438 * removed. As part of handling the I/O error, we remove the device.
440 * When a LUN is added or removed, the host sends us a signal to
441 * scan the host. Thus we are forced to discover the LUNs that
442 * may have been removed this way.
444 mutex_lock(&host
->scan_mutex
);
445 shost_for_each_device(sdev
, host
)
446 scsi_test_unit_ready(sdev
, 1, 1, NULL
);
447 mutex_unlock(&host
->scan_mutex
);
449 * Now scan the host to discover LUNs that may have been added.
451 scsi_scan_host(host
);
456 static void storvsc_remove_lun(struct work_struct
*work
)
458 struct storvsc_scan_work
*wrk
;
459 struct scsi_device
*sdev
;
461 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
462 if (!scsi_host_get(wrk
->host
))
465 sdev
= scsi_device_lookup(wrk
->host
, 0, 0, wrk
->lun
);
468 scsi_remove_device(sdev
);
469 scsi_device_put(sdev
);
471 scsi_host_put(wrk
->host
);
478 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
479 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
482 static inline u16
storvsc_get_version(u8 major
, u8 minor
)
486 version
= ((major
<< 8) | minor
);
491 * We can get incoming messages from the host that are not in response to
492 * messages that we have sent out. An example of this would be messages
493 * received by the guest to notify dynamic addition/removal of LUNs. To
494 * deal with potential race conditions where the driver may be in the
495 * midst of being unloaded when we might receive an unsolicited message
496 * from the host, we have implemented a mechanism to gurantee sequential
499 * 1) Once the device is marked as being destroyed, we will fail all
501 * 2) We permit incoming messages when the device is being destroyed,
502 * only to properly account for messages already sent out.
505 static inline struct storvsc_device
*get_out_stor_device(
506 struct hv_device
*device
)
508 struct storvsc_device
*stor_device
;
510 stor_device
= hv_get_drvdata(device
);
512 if (stor_device
&& stor_device
->destroy
)
519 static inline void storvsc_wait_to_drain(struct storvsc_device
*dev
)
521 dev
->drain_notify
= true;
522 wait_event(dev
->waiting_to_drain
,
523 atomic_read(&dev
->num_outstanding_req
) == 0);
524 dev
->drain_notify
= false;
527 static inline struct storvsc_device
*get_in_stor_device(
528 struct hv_device
*device
)
530 struct storvsc_device
*stor_device
;
532 stor_device
= hv_get_drvdata(device
);
538 * If the device is being destroyed; allow incoming
539 * traffic only to cleanup outstanding requests.
542 if (stor_device
->destroy
&&
543 (atomic_read(&stor_device
->num_outstanding_req
) == 0))
551 static void destroy_bounce_buffer(struct scatterlist
*sgl
,
552 unsigned int sg_count
)
555 struct page
*page_buf
;
557 for (i
= 0; i
< sg_count
; i
++) {
558 page_buf
= sg_page((&sgl
[i
]));
559 if (page_buf
!= NULL
)
560 __free_page(page_buf
);
566 static int do_bounce_buffer(struct scatterlist
*sgl
, unsigned int sg_count
)
570 /* No need to check */
574 /* We have at least 2 sg entries */
575 for (i
= 0; i
< sg_count
; i
++) {
577 /* make sure 1st one does not have hole */
578 if (sgl
[i
].offset
+ sgl
[i
].length
!= PAGE_SIZE
)
580 } else if (i
== sg_count
- 1) {
581 /* make sure last one does not have hole */
582 if (sgl
[i
].offset
!= 0)
585 /* make sure no hole in the middle */
586 if (sgl
[i
].length
!= PAGE_SIZE
|| sgl
[i
].offset
!= 0)
593 static struct scatterlist
*create_bounce_buffer(struct scatterlist
*sgl
,
594 unsigned int sg_count
,
600 struct scatterlist
*bounce_sgl
;
601 struct page
*page_buf
;
602 unsigned int buf_len
= ((write
== WRITE_TYPE
) ? 0 : PAGE_SIZE
);
604 num_pages
= ALIGN(len
, PAGE_SIZE
) >> PAGE_SHIFT
;
606 bounce_sgl
= kcalloc(num_pages
, sizeof(struct scatterlist
), GFP_ATOMIC
);
610 sg_init_table(bounce_sgl
, num_pages
);
611 for (i
= 0; i
< num_pages
; i
++) {
612 page_buf
= alloc_page(GFP_ATOMIC
);
615 sg_set_page(&bounce_sgl
[i
], page_buf
, buf_len
, 0);
621 destroy_bounce_buffer(bounce_sgl
, num_pages
);
625 /* Assume the original sgl has enough room */
626 static unsigned int copy_from_bounce_buffer(struct scatterlist
*orig_sgl
,
627 struct scatterlist
*bounce_sgl
,
628 unsigned int orig_sgl_count
,
629 unsigned int bounce_sgl_count
)
633 unsigned long src
, dest
;
634 unsigned int srclen
, destlen
, copylen
;
635 unsigned int total_copied
= 0;
636 unsigned long bounce_addr
= 0;
637 unsigned long dest_addr
= 0;
639 struct scatterlist
*cur_dest_sgl
;
640 struct scatterlist
*cur_src_sgl
;
642 local_irq_save(flags
);
643 cur_dest_sgl
= orig_sgl
;
644 cur_src_sgl
= bounce_sgl
;
645 for (i
= 0; i
< orig_sgl_count
; i
++) {
646 dest_addr
= (unsigned long)
647 kmap_atomic(sg_page(cur_dest_sgl
)) +
648 cur_dest_sgl
->offset
;
650 destlen
= cur_dest_sgl
->length
;
652 if (bounce_addr
== 0)
653 bounce_addr
= (unsigned long)kmap_atomic(
654 sg_page(cur_src_sgl
));
657 src
= bounce_addr
+ cur_src_sgl
->offset
;
658 srclen
= cur_src_sgl
->length
- cur_src_sgl
->offset
;
660 copylen
= min(srclen
, destlen
);
661 memcpy((void *)dest
, (void *)src
, copylen
);
663 total_copied
+= copylen
;
664 cur_src_sgl
->offset
+= copylen
;
668 if (cur_src_sgl
->offset
== cur_src_sgl
->length
) {
670 kunmap_atomic((void *)bounce_addr
);
674 * It is possible that the number of elements
675 * in the bounce buffer may not be equal to
676 * the number of elements in the original
677 * scatter list. Handle this correctly.
680 if (j
== bounce_sgl_count
) {
682 * We are done; cleanup and return.
684 kunmap_atomic((void *)(dest_addr
-
685 cur_dest_sgl
->offset
));
686 local_irq_restore(flags
);
690 /* if we need to use another bounce buffer */
691 if (destlen
|| i
!= orig_sgl_count
- 1) {
692 cur_src_sgl
= sg_next(cur_src_sgl
);
693 bounce_addr
= (unsigned long)
695 sg_page(cur_src_sgl
));
697 } else if (destlen
== 0 && i
== orig_sgl_count
- 1) {
698 /* unmap the last bounce that is < PAGE_SIZE */
699 kunmap_atomic((void *)bounce_addr
);
703 kunmap_atomic((void *)(dest_addr
- cur_dest_sgl
->offset
));
704 cur_dest_sgl
= sg_next(cur_dest_sgl
);
707 local_irq_restore(flags
);
712 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
713 static unsigned int copy_to_bounce_buffer(struct scatterlist
*orig_sgl
,
714 struct scatterlist
*bounce_sgl
,
715 unsigned int orig_sgl_count
)
719 unsigned long src
, dest
;
720 unsigned int srclen
, destlen
, copylen
;
721 unsigned int total_copied
= 0;
722 unsigned long bounce_addr
= 0;
723 unsigned long src_addr
= 0;
725 struct scatterlist
*cur_src_sgl
;
726 struct scatterlist
*cur_dest_sgl
;
728 local_irq_save(flags
);
730 cur_src_sgl
= orig_sgl
;
731 cur_dest_sgl
= bounce_sgl
;
733 for (i
= 0; i
< orig_sgl_count
; i
++) {
734 src_addr
= (unsigned long)
735 kmap_atomic(sg_page(cur_src_sgl
)) +
738 srclen
= cur_src_sgl
->length
;
740 if (bounce_addr
== 0)
741 bounce_addr
= (unsigned long)
742 kmap_atomic(sg_page(cur_dest_sgl
));
745 /* assume bounce offset always == 0 */
746 dest
= bounce_addr
+ cur_dest_sgl
->length
;
747 destlen
= PAGE_SIZE
- cur_dest_sgl
->length
;
749 copylen
= min(srclen
, destlen
);
750 memcpy((void *)dest
, (void *)src
, copylen
);
752 total_copied
+= copylen
;
753 cur_dest_sgl
->length
+= copylen
;
757 if (cur_dest_sgl
->length
== PAGE_SIZE
) {
758 /* full..move to next entry */
759 kunmap_atomic((void *)bounce_addr
);
764 /* if we need to use another bounce buffer */
765 if (srclen
&& bounce_addr
== 0) {
766 cur_dest_sgl
= sg_next(cur_dest_sgl
);
767 bounce_addr
= (unsigned long)
769 sg_page(cur_dest_sgl
));
774 kunmap_atomic((void *)(src_addr
- cur_src_sgl
->offset
));
775 cur_src_sgl
= sg_next(cur_src_sgl
);
779 kunmap_atomic((void *)bounce_addr
);
781 local_irq_restore(flags
);
786 static void handle_sc_creation(struct vmbus_channel
*new_sc
)
788 struct hv_device
*device
= new_sc
->primary_channel
->device_obj
;
789 struct storvsc_device
*stor_device
;
790 struct vmstorage_channel_properties props
;
792 stor_device
= get_out_stor_device(device
);
796 if (stor_device
->open_sub_channel
== false)
799 memset(&props
, 0, sizeof(struct vmstorage_channel_properties
));
802 storvsc_ringbuffer_size
,
803 storvsc_ringbuffer_size
,
805 sizeof(struct vmstorage_channel_properties
),
806 storvsc_on_channel_callback
, new_sc
);
809 static void handle_multichannel_storage(struct hv_device
*device
, int max_chns
)
811 struct storvsc_device
*stor_device
;
812 int num_cpus
= num_online_cpus();
814 struct storvsc_cmd_request
*request
;
815 struct vstor_packet
*vstor_packet
;
818 num_sc
= ((max_chns
> num_cpus
) ? num_cpus
: max_chns
);
819 stor_device
= get_out_stor_device(device
);
823 request
= &stor_device
->init_request
;
824 vstor_packet
= &request
->vstor_packet
;
826 stor_device
->open_sub_channel
= true;
828 * Establish a handler for dealing with subchannels.
830 vmbus_set_sc_create_callback(device
->channel
, handle_sc_creation
);
833 * Check to see if sub-channels have already been created. This
834 * can happen when this driver is re-loaded after unloading.
837 if (vmbus_are_subchannels_present(device
->channel
))
840 stor_device
->open_sub_channel
= false;
842 * Request the host to create sub-channels.
844 memset(request
, 0, sizeof(struct storvsc_cmd_request
));
845 init_completion(&request
->wait_event
);
846 vstor_packet
->operation
= VSTOR_OPERATION_CREATE_SUB_CHANNELS
;
847 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
848 vstor_packet
->sub_channel_count
= num_sc
;
850 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
851 (sizeof(struct vstor_packet
) -
853 (unsigned long)request
,
855 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
860 t
= wait_for_completion_timeout(&request
->wait_event
, 10*HZ
);
864 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
865 vstor_packet
->status
!= 0)
869 * Now that we created the sub-channels, invoke the check; this
870 * may trigger the callback.
872 stor_device
->open_sub_channel
= true;
873 vmbus_are_subchannels_present(device
->channel
);
876 static int storvsc_channel_init(struct hv_device
*device
)
878 struct storvsc_device
*stor_device
;
879 struct storvsc_cmd_request
*request
;
880 struct vstor_packet
*vstor_packet
;
883 bool process_sub_channels
= false;
885 stor_device
= get_out_stor_device(device
);
889 request
= &stor_device
->init_request
;
890 vstor_packet
= &request
->vstor_packet
;
893 * Now, initiate the vsc/vsp initialization protocol on the open
896 memset(request
, 0, sizeof(struct storvsc_cmd_request
));
897 init_completion(&request
->wait_event
);
898 vstor_packet
->operation
= VSTOR_OPERATION_BEGIN_INITIALIZATION
;
899 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
901 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
902 (sizeof(struct vstor_packet
) -
904 (unsigned long)request
,
906 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
910 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
916 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
917 vstor_packet
->status
!= 0)
921 /* reuse the packet for version range supported */
922 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
923 vstor_packet
->operation
= VSTOR_OPERATION_QUERY_PROTOCOL_VERSION
;
924 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
926 vstor_packet
->version
.major_minor
=
927 storvsc_get_version(vmstor_current_major
, vmstor_current_minor
);
930 * The revision number is only used in Windows; set it to 0.
932 vstor_packet
->version
.revision
= 0;
934 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
935 (sizeof(struct vstor_packet
) -
937 (unsigned long)request
,
939 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
943 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
949 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
950 vstor_packet
->status
!= 0)
954 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
955 vstor_packet
->operation
= VSTOR_OPERATION_QUERY_PROPERTIES
;
956 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
958 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
959 (sizeof(struct vstor_packet
) -
961 (unsigned long)request
,
963 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
968 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
974 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
975 vstor_packet
->status
!= 0)
979 * Check to see if multi-channel support is there.
980 * Hosts that implement protocol version of 5.1 and above
981 * support multi-channel.
983 max_chns
= vstor_packet
->storage_channel_properties
.max_channel_cnt
;
984 if ((vmbus_proto_version
!= VERSION_WIN7
) &&
985 (vmbus_proto_version
!= VERSION_WS2008
)) {
986 if (vstor_packet
->storage_channel_properties
.flags
&
987 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL
)
988 process_sub_channels
= true;
990 stor_device
->max_transfer_bytes
=
991 vstor_packet
->storage_channel_properties
.max_transfer_bytes
;
993 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
994 vstor_packet
->operation
= VSTOR_OPERATION_END_INITIALIZATION
;
995 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
997 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
998 (sizeof(struct vstor_packet
) -
1000 (unsigned long)request
,
1002 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
1007 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
1013 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
1014 vstor_packet
->status
!= 0)
1017 if (process_sub_channels
)
1018 handle_multichannel_storage(device
, max_chns
);
1025 static void storvsc_handle_error(struct vmscsi_request
*vm_srb
,
1026 struct scsi_cmnd
*scmnd
,
1027 struct Scsi_Host
*host
,
1030 struct storvsc_scan_work
*wrk
;
1031 void (*process_err_fn
)(struct work_struct
*work
);
1032 bool do_work
= false;
1034 switch (vm_srb
->srb_status
) {
1035 case SRB_STATUS_ERROR
:
1037 * If there is an error; offline the device since all
1038 * error recovery strategies would have already been
1039 * deployed on the host side. However, if the command
1040 * were a pass-through command deal with it appropriately.
1042 switch (scmnd
->cmnd
[0]) {
1045 set_host_byte(scmnd
, DID_PASSTHROUGH
);
1048 * On Some Windows hosts TEST_UNIT_READY command can return
1049 * SRB_STATUS_ERROR, let the upper level code deal with it
1050 * based on the sense information.
1052 case TEST_UNIT_READY
:
1055 set_host_byte(scmnd
, DID_TARGET_FAILURE
);
1058 case SRB_STATUS_INVALID_LUN
:
1060 process_err_fn
= storvsc_remove_lun
;
1062 case (SRB_STATUS_ABORTED
| SRB_STATUS_AUTOSENSE_VALID
):
1063 if ((asc
== 0x2a) && (ascq
== 0x9)) {
1065 process_err_fn
= storvsc_device_scan
;
1067 * Retry the I/O that trigerred this.
1069 set_host_byte(scmnd
, DID_REQUEUE
);
1078 * We need to schedule work to process this error; schedule it.
1080 wrk
= kmalloc(sizeof(struct storvsc_scan_work
), GFP_ATOMIC
);
1082 set_host_byte(scmnd
, DID_TARGET_FAILURE
);
1087 wrk
->lun
= vm_srb
->lun
;
1088 INIT_WORK(&wrk
->work
, process_err_fn
);
1089 schedule_work(&wrk
->work
);
1093 static void storvsc_command_completion(struct storvsc_cmd_request
*cmd_request
)
1095 struct scsi_cmnd
*scmnd
= cmd_request
->cmd
;
1096 struct hv_host_device
*host_dev
= shost_priv(scmnd
->device
->host
);
1097 struct scsi_sense_hdr sense_hdr
;
1098 struct vmscsi_request
*vm_srb
;
1099 struct Scsi_Host
*host
;
1100 struct storvsc_device
*stor_dev
;
1101 struct hv_device
*dev
= host_dev
->dev
;
1102 u32 payload_sz
= cmd_request
->payload_sz
;
1103 void *payload
= cmd_request
->payload
;
1105 stor_dev
= get_in_stor_device(dev
);
1106 host
= stor_dev
->host
;
1108 vm_srb
= &cmd_request
->vstor_packet
.vm_srb
;
1109 if (cmd_request
->bounce_sgl_count
) {
1110 if (vm_srb
->data_in
== READ_TYPE
)
1111 copy_from_bounce_buffer(scsi_sglist(scmnd
),
1112 cmd_request
->bounce_sgl
,
1113 scsi_sg_count(scmnd
),
1114 cmd_request
->bounce_sgl_count
);
1115 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
1116 cmd_request
->bounce_sgl_count
);
1119 scmnd
->result
= vm_srb
->scsi_status
;
1121 if (scmnd
->result
) {
1122 if (scsi_normalize_sense(scmnd
->sense_buffer
,
1123 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
1124 scsi_print_sense_hdr(scmnd
->device
, "storvsc",
1128 if (vm_srb
->srb_status
!= SRB_STATUS_SUCCESS
)
1129 storvsc_handle_error(vm_srb
, scmnd
, host
, sense_hdr
.asc
,
1132 scsi_set_resid(scmnd
,
1133 cmd_request
->payload
->range
.len
-
1134 vm_srb
->data_transfer_length
);
1136 scmnd
->scsi_done(scmnd
);
1139 sizeof(struct vmbus_channel_packet_multipage_buffer
))
1143 static void storvsc_on_io_completion(struct hv_device
*device
,
1144 struct vstor_packet
*vstor_packet
,
1145 struct storvsc_cmd_request
*request
)
1147 struct storvsc_device
*stor_device
;
1148 struct vstor_packet
*stor_pkt
;
1150 stor_device
= hv_get_drvdata(device
);
1151 stor_pkt
= &request
->vstor_packet
;
1154 * The current SCSI handling on the host side does
1155 * not correctly handle:
1156 * INQUIRY command with page code parameter set to 0x80
1157 * MODE_SENSE command with cmd[2] == 0x1c
1159 * Setup srb and scsi status so this won't be fatal.
1160 * We do this so we can distinguish truly fatal failues
1161 * (srb status == 0x4) and off-line the device in that case.
1164 if ((stor_pkt
->vm_srb
.cdb
[0] == INQUIRY
) ||
1165 (stor_pkt
->vm_srb
.cdb
[0] == MODE_SENSE
)) {
1166 vstor_packet
->vm_srb
.scsi_status
= 0;
1167 vstor_packet
->vm_srb
.srb_status
= SRB_STATUS_SUCCESS
;
1171 /* Copy over the status...etc */
1172 stor_pkt
->vm_srb
.scsi_status
= vstor_packet
->vm_srb
.scsi_status
;
1173 stor_pkt
->vm_srb
.srb_status
= vstor_packet
->vm_srb
.srb_status
;
1174 stor_pkt
->vm_srb
.sense_info_length
=
1175 vstor_packet
->vm_srb
.sense_info_length
;
1178 if ((vstor_packet
->vm_srb
.scsi_status
& 0xFF) == 0x02) {
1179 /* CHECK_CONDITION */
1180 if (vstor_packet
->vm_srb
.srb_status
&
1181 SRB_STATUS_AUTOSENSE_VALID
) {
1182 /* autosense data available */
1184 memcpy(request
->cmd
->sense_buffer
,
1185 vstor_packet
->vm_srb
.sense_data
,
1186 vstor_packet
->vm_srb
.sense_info_length
);
1191 stor_pkt
->vm_srb
.data_transfer_length
=
1192 vstor_packet
->vm_srb
.data_transfer_length
;
1194 storvsc_command_completion(request
);
1196 if (atomic_dec_and_test(&stor_device
->num_outstanding_req
) &&
1197 stor_device
->drain_notify
)
1198 wake_up(&stor_device
->waiting_to_drain
);
1203 static void storvsc_on_receive(struct hv_device
*device
,
1204 struct vstor_packet
*vstor_packet
,
1205 struct storvsc_cmd_request
*request
)
1207 struct storvsc_scan_work
*work
;
1208 struct storvsc_device
*stor_device
;
1210 switch (vstor_packet
->operation
) {
1211 case VSTOR_OPERATION_COMPLETE_IO
:
1212 storvsc_on_io_completion(device
, vstor_packet
, request
);
1215 case VSTOR_OPERATION_REMOVE_DEVICE
:
1216 case VSTOR_OPERATION_ENUMERATE_BUS
:
1217 stor_device
= get_in_stor_device(device
);
1218 work
= kmalloc(sizeof(struct storvsc_scan_work
), GFP_ATOMIC
);
1222 INIT_WORK(&work
->work
, storvsc_host_scan
);
1223 work
->host
= stor_device
->host
;
1224 schedule_work(&work
->work
);
1232 static void storvsc_on_channel_callback(void *context
)
1234 struct vmbus_channel
*channel
= (struct vmbus_channel
*)context
;
1235 struct hv_device
*device
;
1236 struct storvsc_device
*stor_device
;
1239 unsigned char packet
[ALIGN(sizeof(struct vstor_packet
), 8)];
1240 struct storvsc_cmd_request
*request
;
1243 if (channel
->primary_channel
!= NULL
)
1244 device
= channel
->primary_channel
->device_obj
;
1246 device
= channel
->device_obj
;
1248 stor_device
= get_in_stor_device(device
);
1253 ret
= vmbus_recvpacket(channel
, packet
,
1254 ALIGN((sizeof(struct vstor_packet
) -
1255 vmscsi_size_delta
), 8),
1256 &bytes_recvd
, &request_id
);
1257 if (ret
== 0 && bytes_recvd
> 0) {
1259 request
= (struct storvsc_cmd_request
*)
1260 (unsigned long)request_id
;
1262 if ((request
== &stor_device
->init_request
) ||
1263 (request
== &stor_device
->reset_request
)) {
1265 memcpy(&request
->vstor_packet
, packet
,
1266 (sizeof(struct vstor_packet
) -
1267 vmscsi_size_delta
));
1268 complete(&request
->wait_event
);
1270 storvsc_on_receive(device
,
1271 (struct vstor_packet
*)packet
,
1282 static int storvsc_connect_to_vsp(struct hv_device
*device
, u32 ring_size
)
1284 struct vmstorage_channel_properties props
;
1287 memset(&props
, 0, sizeof(struct vmstorage_channel_properties
));
1289 ret
= vmbus_open(device
->channel
,
1293 sizeof(struct vmstorage_channel_properties
),
1294 storvsc_on_channel_callback
, device
->channel
);
1299 ret
= storvsc_channel_init(device
);
1304 static int storvsc_dev_remove(struct hv_device
*device
)
1306 struct storvsc_device
*stor_device
;
1307 unsigned long flags
;
1309 stor_device
= hv_get_drvdata(device
);
1311 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
1312 stor_device
->destroy
= true;
1313 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
1316 * At this point, all outbound traffic should be disable. We
1317 * only allow inbound traffic (responses) to proceed so that
1318 * outstanding requests can be completed.
1321 storvsc_wait_to_drain(stor_device
);
1324 * Since we have already drained, we don't need to busy wait
1325 * as was done in final_release_stor_device()
1326 * Note that we cannot set the ext pointer to NULL until
1327 * we have drained - to drain the outgoing packets, we need to
1328 * allow incoming packets.
1330 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
1331 hv_set_drvdata(device
, NULL
);
1332 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
1334 /* Close the channel */
1335 vmbus_close(device
->channel
);
1341 static int storvsc_do_io(struct hv_device
*device
,
1342 struct storvsc_cmd_request
*request
)
1344 struct storvsc_device
*stor_device
;
1345 struct vstor_packet
*vstor_packet
;
1346 struct vmbus_channel
*outgoing_channel
;
1349 vstor_packet
= &request
->vstor_packet
;
1350 stor_device
= get_out_stor_device(device
);
1356 request
->device
= device
;
1358 * Select an an appropriate channel to send the request out.
1361 outgoing_channel
= vmbus_get_outgoing_channel(device
->channel
);
1364 vstor_packet
->flags
|= REQUEST_COMPLETION_FLAG
;
1366 vstor_packet
->vm_srb
.length
= (sizeof(struct vmscsi_request
) -
1370 vstor_packet
->vm_srb
.sense_info_length
= sense_buffer_size
;
1373 vstor_packet
->vm_srb
.data_transfer_length
=
1374 request
->payload
->range
.len
;
1376 vstor_packet
->operation
= VSTOR_OPERATION_EXECUTE_SRB
;
1378 if (request
->payload
->range
.len
) {
1380 ret
= vmbus_sendpacket_mpb_desc(outgoing_channel
,
1381 request
->payload
, request
->payload_sz
,
1383 (sizeof(struct vstor_packet
) -
1385 (unsigned long)request
);
1387 ret
= vmbus_sendpacket(outgoing_channel
, vstor_packet
,
1388 (sizeof(struct vstor_packet
) -
1390 (unsigned long)request
,
1392 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
1398 atomic_inc(&stor_device
->num_outstanding_req
);
1403 static int storvsc_device_configure(struct scsi_device
*sdevice
)
1406 blk_queue_max_segment_size(sdevice
->request_queue
, PAGE_SIZE
);
1408 blk_queue_bounce_limit(sdevice
->request_queue
, BLK_BOUNCE_ANY
);
1410 blk_queue_rq_timeout(sdevice
->request_queue
, (storvsc_timeout
* HZ
));
1412 sdevice
->no_write_same
= 1;
1415 * Add blist flags to permit the reading of the VPD pages even when
1416 * the target may claim SPC-2 compliance. MSFT targets currently
1417 * claim SPC-2 compliance while they implement post SPC-2 features.
1418 * With this patch we can correctly handle WRITE_SAME_16 issues.
1420 sdevice
->sdev_bflags
|= msft_blist_flags
;
1423 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
1424 * if the device is a MSFT virtual device.
1426 if (!strncmp(sdevice
->vendor
, "Msft", 4)) {
1427 switch (vmbus_proto_version
) {
1429 case VERSION_WIN8_1
:
1430 sdevice
->scsi_level
= SCSI_SPC_3
;
1438 static int storvsc_get_chs(struct scsi_device
*sdev
, struct block_device
* bdev
,
1439 sector_t capacity
, int *info
)
1441 sector_t nsect
= capacity
;
1442 sector_t cylinders
= nsect
;
1443 int heads
, sectors_pt
;
1446 * We are making up these values; let us keep it simple.
1449 sectors_pt
= 0x3f; /* Sectors per track */
1450 sector_div(cylinders
, heads
* sectors_pt
);
1451 if ((sector_t
)(cylinders
+ 1) * heads
* sectors_pt
< nsect
)
1455 info
[1] = sectors_pt
;
1456 info
[2] = (int)cylinders
;
1461 static int storvsc_host_reset_handler(struct scsi_cmnd
*scmnd
)
1463 struct hv_host_device
*host_dev
= shost_priv(scmnd
->device
->host
);
1464 struct hv_device
*device
= host_dev
->dev
;
1466 struct storvsc_device
*stor_device
;
1467 struct storvsc_cmd_request
*request
;
1468 struct vstor_packet
*vstor_packet
;
1472 stor_device
= get_out_stor_device(device
);
1476 request
= &stor_device
->reset_request
;
1477 vstor_packet
= &request
->vstor_packet
;
1479 init_completion(&request
->wait_event
);
1481 vstor_packet
->operation
= VSTOR_OPERATION_RESET_BUS
;
1482 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
1483 vstor_packet
->vm_srb
.path_id
= stor_device
->path_id
;
1485 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
1486 (sizeof(struct vstor_packet
) -
1488 (unsigned long)&stor_device
->reset_request
,
1490 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
1494 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
1496 return TIMEOUT_ERROR
;
1500 * At this point, all outstanding requests in the adapter
1501 * should have been flushed out and return to us
1502 * There is a potential race here where the host may be in
1503 * the process of responding when we return from here.
1504 * Just wait for all in-transit packets to be accounted for
1505 * before we return from here.
1507 storvsc_wait_to_drain(stor_device
);
1513 * The host guarantees to respond to each command, although I/O latencies might
1514 * be unbounded on Azure. Reset the timer unconditionally to give the host a
1515 * chance to perform EH.
1517 static enum blk_eh_timer_return
storvsc_eh_timed_out(struct scsi_cmnd
*scmnd
)
1519 return BLK_EH_RESET_TIMER
;
1522 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd
*scmnd
)
1524 bool allowed
= true;
1525 u8 scsi_op
= scmnd
->cmnd
[0];
1528 /* the host does not handle WRITE_SAME, log accident usage */
1531 * smartd sends this command and the host does not handle
1532 * this. So, don't send it.
1535 scmnd
->result
= ILLEGAL_REQUEST
<< 16;
1544 static int storvsc_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scmnd
)
1547 struct hv_host_device
*host_dev
= shost_priv(host
);
1548 struct hv_device
*dev
= host_dev
->dev
;
1549 struct storvsc_cmd_request
*cmd_request
= scsi_cmd_priv(scmnd
);
1551 struct scatterlist
*sgl
;
1552 unsigned int sg_count
= 0;
1553 struct vmscsi_request
*vm_srb
;
1554 struct scatterlist
*cur_sgl
;
1555 struct vmbus_packet_mpb_array
*payload
;
1559 if (vmstor_current_major
<= VMSTOR_WIN8_MAJOR
) {
1561 * On legacy hosts filter unimplemented commands.
1562 * Future hosts are expected to correctly handle
1563 * unsupported commands. Furthermore, it is
1564 * possible that some of the currently
1565 * unsupported commands maybe supported in
1566 * future versions of the host.
1568 if (!storvsc_scsi_cmd_ok(scmnd
)) {
1569 scmnd
->scsi_done(scmnd
);
1574 /* Setup the cmd request */
1575 cmd_request
->cmd
= scmnd
;
1577 vm_srb
= &cmd_request
->vstor_packet
.vm_srb
;
1578 vm_srb
->win8_extension
.time_out_value
= 60;
1580 vm_srb
->win8_extension
.srb_flags
|=
1581 (SRB_FLAGS_QUEUE_ACTION_ENABLE
|
1582 SRB_FLAGS_DISABLE_SYNCH_TRANSFER
);
1585 switch (scmnd
->sc_data_direction
) {
1587 vm_srb
->data_in
= WRITE_TYPE
;
1588 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_DATA_OUT
;
1590 case DMA_FROM_DEVICE
:
1591 vm_srb
->data_in
= READ_TYPE
;
1592 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_DATA_IN
;
1595 vm_srb
->data_in
= UNKNOWN_TYPE
;
1596 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_NO_DATA_TRANSFER
;
1600 * This is DMA_BIDIRECTIONAL or something else we are never
1601 * supposed to see here.
1603 WARN(1, "Unexpected data direction: %d\n",
1604 scmnd
->sc_data_direction
);
1609 vm_srb
->port_number
= host_dev
->port
;
1610 vm_srb
->path_id
= scmnd
->device
->channel
;
1611 vm_srb
->target_id
= scmnd
->device
->id
;
1612 vm_srb
->lun
= scmnd
->device
->lun
;
1614 vm_srb
->cdb_length
= scmnd
->cmd_len
;
1616 memcpy(vm_srb
->cdb
, scmnd
->cmnd
, vm_srb
->cdb_length
);
1618 sgl
= (struct scatterlist
*)scsi_sglist(scmnd
);
1619 sg_count
= scsi_sg_count(scmnd
);
1621 length
= scsi_bufflen(scmnd
);
1622 payload
= (struct vmbus_packet_mpb_array
*)&cmd_request
->mpb
;
1623 payload_sz
= sizeof(cmd_request
->mpb
);
1626 /* check if we need to bounce the sgl */
1627 if (do_bounce_buffer(sgl
, scsi_sg_count(scmnd
)) != -1) {
1628 cmd_request
->bounce_sgl
=
1629 create_bounce_buffer(sgl
, sg_count
,
1632 if (!cmd_request
->bounce_sgl
)
1633 return SCSI_MLQUEUE_HOST_BUSY
;
1635 cmd_request
->bounce_sgl_count
=
1636 ALIGN(length
, PAGE_SIZE
) >> PAGE_SHIFT
;
1638 if (vm_srb
->data_in
== WRITE_TYPE
)
1639 copy_to_bounce_buffer(sgl
,
1640 cmd_request
->bounce_sgl
, sg_count
);
1642 sgl
= cmd_request
->bounce_sgl
;
1643 sg_count
= cmd_request
->bounce_sgl_count
;
1647 if (sg_count
> MAX_PAGE_BUFFER_COUNT
) {
1649 payload_sz
= (sg_count
* sizeof(void *) +
1650 sizeof(struct vmbus_packet_mpb_array
));
1651 payload
= kmalloc(payload_sz
, GFP_ATOMIC
);
1653 if (cmd_request
->bounce_sgl_count
)
1654 destroy_bounce_buffer(
1655 cmd_request
->bounce_sgl
,
1656 cmd_request
->bounce_sgl_count
);
1658 return SCSI_MLQUEUE_DEVICE_BUSY
;
1662 payload
->range
.len
= length
;
1663 payload
->range
.offset
= sgl
[0].offset
;
1666 for (i
= 0; i
< sg_count
; i
++) {
1667 payload
->range
.pfn_array
[i
] =
1668 page_to_pfn(sg_page((cur_sgl
)));
1669 cur_sgl
= sg_next(cur_sgl
);
1672 } else if (scsi_sglist(scmnd
)) {
1673 payload
->range
.len
= length
;
1674 payload
->range
.offset
=
1675 virt_to_phys(scsi_sglist(scmnd
)) & (PAGE_SIZE
-1);
1676 payload
->range
.pfn_array
[0] =
1677 virt_to_phys(scsi_sglist(scmnd
)) >> PAGE_SHIFT
;
1680 cmd_request
->payload
= payload
;
1681 cmd_request
->payload_sz
= payload_sz
;
1683 /* Invokes the vsc to start an IO */
1684 ret
= storvsc_do_io(dev
, cmd_request
);
1686 if (ret
== -EAGAIN
) {
1689 if (cmd_request
->bounce_sgl_count
)
1690 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
1691 cmd_request
->bounce_sgl_count
);
1693 return SCSI_MLQUEUE_DEVICE_BUSY
;
1699 static struct scsi_host_template scsi_driver
= {
1700 .module
= THIS_MODULE
,
1701 .name
= "storvsc_host_t",
1702 .cmd_size
= sizeof(struct storvsc_cmd_request
),
1703 .bios_param
= storvsc_get_chs
,
1704 .queuecommand
= storvsc_queuecommand
,
1705 .eh_host_reset_handler
= storvsc_host_reset_handler
,
1706 .proc_name
= "storvsc_host",
1707 .eh_timed_out
= storvsc_eh_timed_out
,
1708 .slave_configure
= storvsc_device_configure
,
1711 .use_clustering
= ENABLE_CLUSTERING
,
1712 /* Make sure we dont get a sg segment crosses a page boundary */
1713 .dma_boundary
= PAGE_SIZE
-1,
1723 static const struct hv_vmbus_device_id id_table
[] = {
1726 .driver_data
= SCSI_GUID
1730 .driver_data
= IDE_GUID
1732 /* Fibre Channel GUID */
1735 .driver_data
= SFC_GUID
1740 MODULE_DEVICE_TABLE(vmbus
, id_table
);
1742 static int storvsc_probe(struct hv_device
*device
,
1743 const struct hv_vmbus_device_id
*dev_id
)
1746 int num_cpus
= num_online_cpus();
1747 struct Scsi_Host
*host
;
1748 struct hv_host_device
*host_dev
;
1749 bool dev_is_ide
= ((dev_id
->driver_data
== IDE_GUID
) ? true : false);
1751 struct storvsc_device
*stor_device
;
1752 int max_luns_per_target
;
1755 int max_sub_channels
= 0;
1758 * Based on the windows host we are running on,
1759 * set state to properly communicate with the host.
1762 switch (vmbus_proto_version
) {
1763 case VERSION_WS2008
:
1765 sense_buffer_size
= PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE
;
1766 vmscsi_size_delta
= sizeof(struct vmscsi_win8_extension
);
1767 vmstor_current_major
= VMSTOR_WIN7_MAJOR
;
1768 vmstor_current_minor
= VMSTOR_WIN7_MINOR
;
1769 max_luns_per_target
= STORVSC_IDE_MAX_LUNS_PER_TARGET
;
1770 max_targets
= STORVSC_IDE_MAX_TARGETS
;
1771 max_channels
= STORVSC_IDE_MAX_CHANNELS
;
1774 sense_buffer_size
= POST_WIN7_STORVSC_SENSE_BUFFER_SIZE
;
1775 vmscsi_size_delta
= 0;
1776 vmstor_current_major
= VMSTOR_WIN8_MAJOR
;
1777 vmstor_current_minor
= VMSTOR_WIN8_MINOR
;
1778 max_luns_per_target
= STORVSC_MAX_LUNS_PER_TARGET
;
1779 max_targets
= STORVSC_MAX_TARGETS
;
1780 max_channels
= STORVSC_MAX_CHANNELS
;
1782 * On Windows8 and above, we support sub-channels for storage.
1783 * The number of sub-channels offerred is based on the number of
1784 * VCPUs in the guest.
1786 max_sub_channels
= (num_cpus
/ storvsc_vcpus_per_sub_channel
);
1790 scsi_driver
.can_queue
= (max_outstanding_req_per_channel
*
1791 (max_sub_channels
+ 1));
1793 host
= scsi_host_alloc(&scsi_driver
,
1794 sizeof(struct hv_host_device
));
1798 host_dev
= shost_priv(host
);
1799 memset(host_dev
, 0, sizeof(struct hv_host_device
));
1801 host_dev
->port
= host
->host_no
;
1802 host_dev
->dev
= device
;
1805 stor_device
= kzalloc(sizeof(struct storvsc_device
), GFP_KERNEL
);
1811 stor_device
->destroy
= false;
1812 stor_device
->open_sub_channel
= false;
1813 init_waitqueue_head(&stor_device
->waiting_to_drain
);
1814 stor_device
->device
= device
;
1815 stor_device
->host
= host
;
1816 hv_set_drvdata(device
, stor_device
);
1818 stor_device
->port_number
= host
->host_no
;
1819 ret
= storvsc_connect_to_vsp(device
, storvsc_ringbuffer_size
);
1823 host_dev
->path
= stor_device
->path_id
;
1824 host_dev
->target
= stor_device
->target_id
;
1826 switch (dev_id
->driver_data
) {
1828 host
->max_lun
= STORVSC_FC_MAX_LUNS_PER_TARGET
;
1829 host
->max_id
= STORVSC_FC_MAX_TARGETS
;
1830 host
->max_channel
= STORVSC_FC_MAX_CHANNELS
- 1;
1834 host
->max_lun
= max_luns_per_target
;
1835 host
->max_id
= max_targets
;
1836 host
->max_channel
= max_channels
- 1;
1840 host
->max_lun
= STORVSC_IDE_MAX_LUNS_PER_TARGET
;
1841 host
->max_id
= STORVSC_IDE_MAX_TARGETS
;
1842 host
->max_channel
= STORVSC_IDE_MAX_CHANNELS
- 1;
1845 /* max cmd length */
1846 host
->max_cmd_len
= STORVSC_MAX_CMD_LEN
;
1849 * set the table size based on the info we got
1852 host
->sg_tablesize
= (stor_device
->max_transfer_bytes
>> PAGE_SHIFT
);
1854 /* Register the HBA and start the scsi bus scan */
1855 ret
= scsi_add_host(host
, &device
->device
);
1860 scsi_scan_host(host
);
1862 target
= (device
->dev_instance
.b
[5] << 8 |
1863 device
->dev_instance
.b
[4]);
1864 ret
= scsi_add_device(host
, 0, target
, 0);
1866 scsi_remove_host(host
);
1874 * Once we have connected with the host, we would need to
1875 * to invoke storvsc_dev_remove() to rollback this state and
1876 * this call also frees up the stor_device; hence the jump around
1879 storvsc_dev_remove(device
);
1886 scsi_host_put(host
);
1890 static int storvsc_remove(struct hv_device
*dev
)
1892 struct storvsc_device
*stor_device
= hv_get_drvdata(dev
);
1893 struct Scsi_Host
*host
= stor_device
->host
;
1895 scsi_remove_host(host
);
1896 storvsc_dev_remove(dev
);
1897 scsi_host_put(host
);
1902 static struct hv_driver storvsc_drv
= {
1903 .name
= KBUILD_MODNAME
,
1904 .id_table
= id_table
,
1905 .probe
= storvsc_probe
,
1906 .remove
= storvsc_remove
,
1909 static int __init
storvsc_drv_init(void)
1913 * Divide the ring buffer data size (which is 1 page less
1914 * than the ring buffer size since that page is reserved for
1915 * the ring buffer indices) by the max request size (which is
1916 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1918 max_outstanding_req_per_channel
=
1919 ((storvsc_ringbuffer_size
- PAGE_SIZE
) /
1920 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET
+
1921 sizeof(struct vstor_packet
) + sizeof(u64
) -
1925 return vmbus_driver_register(&storvsc_drv
);
1928 static void __exit
storvsc_drv_exit(void)
1930 vmbus_driver_unregister(&storvsc_drv
);
1933 MODULE_LICENSE("GPL");
1934 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
1935 module_init(storvsc_drv_init
);
1936 module_exit(storvsc_drv_exit
);