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>
44 #include <scsi/scsi_transport_fc.h>
47 * All wire protocol details (storage protocol between the guest and the host)
48 * are consolidated here.
50 * Begin protocol definitions.
56 * V1 RC < 2008/1/31: 1.0
57 * V1 RC > 2008/1/31: 2.0
64 #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
67 #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0)
68 #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2)
69 #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1)
70 #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0)
71 #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2)
73 /* Packet structure describing virtual storage requests. */
74 enum vstor_packet_operation
{
75 VSTOR_OPERATION_COMPLETE_IO
= 1,
76 VSTOR_OPERATION_REMOVE_DEVICE
= 2,
77 VSTOR_OPERATION_EXECUTE_SRB
= 3,
78 VSTOR_OPERATION_RESET_LUN
= 4,
79 VSTOR_OPERATION_RESET_ADAPTER
= 5,
80 VSTOR_OPERATION_RESET_BUS
= 6,
81 VSTOR_OPERATION_BEGIN_INITIALIZATION
= 7,
82 VSTOR_OPERATION_END_INITIALIZATION
= 8,
83 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION
= 9,
84 VSTOR_OPERATION_QUERY_PROPERTIES
= 10,
85 VSTOR_OPERATION_ENUMERATE_BUS
= 11,
86 VSTOR_OPERATION_FCHBA_DATA
= 12,
87 VSTOR_OPERATION_CREATE_SUB_CHANNELS
= 13,
88 VSTOR_OPERATION_MAXIMUM
= 13
92 * WWN packet for Fibre Channel HBA
95 struct hv_fc_wwn_packet
{
98 u8 primary_port_wwn
[8];
99 u8 primary_node_wwn
[8];
100 u8 secondary_port_wwn
[8];
101 u8 secondary_node_wwn
[8];
110 #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002
111 #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004
112 #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008
113 #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010
114 #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020
115 #define SRB_FLAGS_DATA_IN 0x00000040
116 #define SRB_FLAGS_DATA_OUT 0x00000080
117 #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000
118 #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)
119 #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100
120 #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200
121 #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400
124 * This flag indicates the request is part of the workflow for processing a D3.
126 #define SRB_FLAGS_D3_PROCESSING 0x00000800
127 #define SRB_FLAGS_IS_ACTIVE 0x00010000
128 #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000
129 #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000
130 #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000
131 #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000
132 #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000
133 #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000
134 #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000
135 #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000
136 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000
140 * Platform neutral description of a scsi request -
141 * this remains the same across the write regardless of 32/64 bit
142 * note: it's patterned off the SCSI_PASS_THROUGH structure
144 #define STORVSC_MAX_CMD_LEN 0x10
146 #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
147 #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
149 #define STORVSC_SENSE_BUFFER_SIZE 0x14
150 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
153 * Sense buffer size changed in win8; have a run-time
154 * variable to track the size we should use. This value will
155 * likely change during protocol negotiation but it is valid
156 * to start by assuming pre-Win8.
158 static int sense_buffer_size
= PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE
;
161 * The storage protocol version is determined during the
162 * initial exchange with the host. It will indicate which
163 * storage functionality is available in the host.
165 static int vmstor_proto_version
;
167 #define STORVSC_LOGGING_NONE 0
168 #define STORVSC_LOGGING_ERROR 1
169 #define STORVSC_LOGGING_WARN 2
171 static int logging_level
= STORVSC_LOGGING_ERROR
;
172 module_param(logging_level
, int, S_IRUGO
|S_IWUSR
);
173 MODULE_PARM_DESC(logging_level
,
174 "Logging level, 0 - None, 1 - Error (default), 2 - Warning.");
176 static inline bool do_logging(int level
)
178 return logging_level
>= level
;
181 #define storvsc_log(dev, level, fmt, ...) \
183 if (do_logging(level)) \
184 dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \
187 struct vmscsi_win8_extension
{
189 * The following were added in Windows 8
199 struct vmscsi_request
{
210 u8 sense_info_length
;
214 u32 data_transfer_length
;
217 u8 cdb
[STORVSC_MAX_CMD_LEN
];
218 u8 sense_data
[STORVSC_SENSE_BUFFER_SIZE
];
219 u8 reserved_array
[STORVSC_MAX_BUF_LEN_WITH_PADDING
];
222 * The following was added in win8.
224 struct vmscsi_win8_extension win8_extension
;
226 } __attribute((packed
));
230 * The size of the vmscsi_request has changed in win8. The
231 * additional size is because of new elements added to the
232 * structure. These elements are valid only when we are talking
234 * Track the correction to size we need to apply. This value
235 * will likely change during protocol negotiation but it is
236 * valid to start by assuming pre-Win8.
238 static int vmscsi_size_delta
= sizeof(struct vmscsi_win8_extension
);
241 * The list of storage protocols in order of preference.
243 struct vmstor_protocol
{
244 int protocol_version
;
245 int sense_buffer_size
;
246 int vmscsi_size_delta
;
250 static const struct vmstor_protocol vmstor_protocols
[] = {
252 VMSTOR_PROTO_VERSION_WIN10
,
253 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE
,
257 VMSTOR_PROTO_VERSION_WIN8_1
,
258 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE
,
262 VMSTOR_PROTO_VERSION_WIN8
,
263 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE
,
267 VMSTOR_PROTO_VERSION_WIN7
,
268 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE
,
269 sizeof(struct vmscsi_win8_extension
),
272 VMSTOR_PROTO_VERSION_WIN6
,
273 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE
,
274 sizeof(struct vmscsi_win8_extension
),
280 * This structure is sent during the intialization phase to get the different
281 * properties of the channel.
284 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
286 struct vmstorage_channel_properties
{
292 u32 max_transfer_bytes
;
297 /* This structure is sent during the storage protocol negotiations. */
298 struct vmstorage_protocol_version
{
299 /* Major (MSW) and minor (LSW) version numbers. */
303 * Revision number is auto-incremented whenever this file is changed
304 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
305 * definitely indicate incompatibility--but it does indicate mismatched
307 * This is only used on the windows side. Just set it to 0.
312 /* Channel Property Flags */
313 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
314 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
316 struct vstor_packet
{
317 /* Requested operation type */
318 enum vstor_packet_operation operation
;
320 /* Flags - see below for values */
323 /* Status of the request returned from the server side. */
326 /* Data payload area */
329 * Structure used to forward SCSI commands from the
330 * client to the server.
332 struct vmscsi_request vm_srb
;
334 /* Structure used to query channel properties. */
335 struct vmstorage_channel_properties storage_channel_properties
;
337 /* Used during version negotiations. */
338 struct vmstorage_protocol_version version
;
340 /* Fibre channel address packet */
341 struct hv_fc_wwn_packet wwn_packet
;
343 /* Number of sub-channels to create */
344 u16 sub_channel_count
;
346 /* This will be the maximum of the union members */
354 * This flag indicates that the server should send back a completion for this
358 #define REQUEST_COMPLETION_FLAG 0x1
360 /* Matches Windows-end */
361 enum storvsc_request_type
{
368 * SRB status codes and masks; a subset of the codes used here.
371 #define SRB_STATUS_AUTOSENSE_VALID 0x80
372 #define SRB_STATUS_QUEUE_FROZEN 0x40
373 #define SRB_STATUS_INVALID_LUN 0x20
374 #define SRB_STATUS_SUCCESS 0x01
375 #define SRB_STATUS_ABORTED 0x02
376 #define SRB_STATUS_ERROR 0x04
378 #define SRB_STATUS(status) \
379 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN))
381 * This is the end of Protocol specific defines.
384 static int storvsc_ringbuffer_size
= (256 * PAGE_SIZE
);
385 static u32 max_outstanding_req_per_channel
;
387 static int storvsc_vcpus_per_sub_channel
= 4;
389 module_param(storvsc_ringbuffer_size
, int, S_IRUGO
);
390 MODULE_PARM_DESC(storvsc_ringbuffer_size
, "Ring buffer size (bytes)");
392 module_param(storvsc_vcpus_per_sub_channel
, int, S_IRUGO
);
393 MODULE_PARM_DESC(vcpus_per_sub_channel
, "Ratio of VCPUs to subchannels");
395 * Timeout in seconds for all devices managed by this driver.
397 static int storvsc_timeout
= 180;
399 static int msft_blist_flags
= BLIST_TRY_VPD_PAGES
;
401 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
402 static struct scsi_transport_template
*fc_transport_template
;
405 static void storvsc_on_channel_callback(void *context
);
407 #define STORVSC_MAX_LUNS_PER_TARGET 255
408 #define STORVSC_MAX_TARGETS 2
409 #define STORVSC_MAX_CHANNELS 8
411 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255
412 #define STORVSC_FC_MAX_TARGETS 128
413 #define STORVSC_FC_MAX_CHANNELS 8
415 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
416 #define STORVSC_IDE_MAX_TARGETS 1
417 #define STORVSC_IDE_MAX_CHANNELS 1
419 struct storvsc_cmd_request
{
420 struct scsi_cmnd
*cmd
;
422 struct hv_device
*device
;
424 /* Synchronize the request/response if needed */
425 struct completion wait_event
;
427 struct vmbus_channel_packet_multipage_buffer mpb
;
428 struct vmbus_packet_mpb_array
*payload
;
431 struct vstor_packet vstor_packet
;
435 /* A storvsc device is a device object that contains a vmbus channel */
436 struct storvsc_device
{
437 struct hv_device
*device
;
441 bool open_sub_channel
;
442 atomic_t num_outstanding_req
;
443 struct Scsi_Host
*host
;
445 wait_queue_head_t waiting_to_drain
;
448 * Each unique Port/Path/Target represents 1 channel ie scsi
449 * controller. In reality, the pathid, targetid is always 0
450 * and the port is set by us
452 unsigned int port_number
;
453 unsigned char path_id
;
454 unsigned char target_id
;
457 * Max I/O, the device can support.
459 u32 max_transfer_bytes
;
460 /* Used for vsc/vsp channel reset process */
461 struct storvsc_cmd_request init_request
;
462 struct storvsc_cmd_request reset_request
;
464 * Currently active port and node names for FC devices.
470 struct hv_host_device
{
471 struct hv_device
*dev
;
474 unsigned char target
;
477 struct storvsc_scan_work
{
478 struct work_struct work
;
479 struct Scsi_Host
*host
;
483 static void storvsc_device_scan(struct work_struct
*work
)
485 struct storvsc_scan_work
*wrk
;
487 struct scsi_device
*sdev
;
489 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
492 sdev
= scsi_device_lookup(wrk
->host
, 0, 0, lun
);
495 scsi_rescan_device(&sdev
->sdev_gendev
);
496 scsi_device_put(sdev
);
502 static void storvsc_host_scan(struct work_struct
*work
)
504 struct storvsc_scan_work
*wrk
;
505 struct Scsi_Host
*host
;
506 struct scsi_device
*sdev
;
508 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
512 * Before scanning the host, first check to see if any of the
513 * currrently known devices have been hot removed. We issue a
514 * "unit ready" command against all currently known devices.
515 * This I/O will result in an error for devices that have been
516 * removed. As part of handling the I/O error, we remove the device.
518 * When a LUN is added or removed, the host sends us a signal to
519 * scan the host. Thus we are forced to discover the LUNs that
520 * may have been removed this way.
522 mutex_lock(&host
->scan_mutex
);
523 shost_for_each_device(sdev
, host
)
524 scsi_test_unit_ready(sdev
, 1, 1, NULL
);
525 mutex_unlock(&host
->scan_mutex
);
527 * Now scan the host to discover LUNs that may have been added.
529 scsi_scan_host(host
);
534 static void storvsc_remove_lun(struct work_struct
*work
)
536 struct storvsc_scan_work
*wrk
;
537 struct scsi_device
*sdev
;
539 wrk
= container_of(work
, struct storvsc_scan_work
, work
);
540 if (!scsi_host_get(wrk
->host
))
543 sdev
= scsi_device_lookup(wrk
->host
, 0, 0, wrk
->lun
);
546 scsi_remove_device(sdev
);
547 scsi_device_put(sdev
);
549 scsi_host_put(wrk
->host
);
557 * We can get incoming messages from the host that are not in response to
558 * messages that we have sent out. An example of this would be messages
559 * received by the guest to notify dynamic addition/removal of LUNs. To
560 * deal with potential race conditions where the driver may be in the
561 * midst of being unloaded when we might receive an unsolicited message
562 * from the host, we have implemented a mechanism to gurantee sequential
565 * 1) Once the device is marked as being destroyed, we will fail all
567 * 2) We permit incoming messages when the device is being destroyed,
568 * only to properly account for messages already sent out.
571 static inline struct storvsc_device
*get_out_stor_device(
572 struct hv_device
*device
)
574 struct storvsc_device
*stor_device
;
576 stor_device
= hv_get_drvdata(device
);
578 if (stor_device
&& stor_device
->destroy
)
585 static inline void storvsc_wait_to_drain(struct storvsc_device
*dev
)
587 dev
->drain_notify
= true;
588 wait_event(dev
->waiting_to_drain
,
589 atomic_read(&dev
->num_outstanding_req
) == 0);
590 dev
->drain_notify
= false;
593 static inline struct storvsc_device
*get_in_stor_device(
594 struct hv_device
*device
)
596 struct storvsc_device
*stor_device
;
598 stor_device
= hv_get_drvdata(device
);
604 * If the device is being destroyed; allow incoming
605 * traffic only to cleanup outstanding requests.
608 if (stor_device
->destroy
&&
609 (atomic_read(&stor_device
->num_outstanding_req
) == 0))
617 static void handle_sc_creation(struct vmbus_channel
*new_sc
)
619 struct hv_device
*device
= new_sc
->primary_channel
->device_obj
;
620 struct storvsc_device
*stor_device
;
621 struct vmstorage_channel_properties props
;
623 stor_device
= get_out_stor_device(device
);
627 if (stor_device
->open_sub_channel
== false)
630 memset(&props
, 0, sizeof(struct vmstorage_channel_properties
));
633 storvsc_ringbuffer_size
,
634 storvsc_ringbuffer_size
,
636 sizeof(struct vmstorage_channel_properties
),
637 storvsc_on_channel_callback
, new_sc
);
640 static void handle_multichannel_storage(struct hv_device
*device
, int max_chns
)
642 struct storvsc_device
*stor_device
;
643 int num_cpus
= num_online_cpus();
645 struct storvsc_cmd_request
*request
;
646 struct vstor_packet
*vstor_packet
;
649 num_sc
= ((max_chns
> num_cpus
) ? num_cpus
: max_chns
);
650 stor_device
= get_out_stor_device(device
);
654 request
= &stor_device
->init_request
;
655 vstor_packet
= &request
->vstor_packet
;
657 stor_device
->open_sub_channel
= true;
659 * Establish a handler for dealing with subchannels.
661 vmbus_set_sc_create_callback(device
->channel
, handle_sc_creation
);
664 * Check to see if sub-channels have already been created. This
665 * can happen when this driver is re-loaded after unloading.
668 if (vmbus_are_subchannels_present(device
->channel
))
671 stor_device
->open_sub_channel
= false;
673 * Request the host to create sub-channels.
675 memset(request
, 0, sizeof(struct storvsc_cmd_request
));
676 init_completion(&request
->wait_event
);
677 vstor_packet
->operation
= VSTOR_OPERATION_CREATE_SUB_CHANNELS
;
678 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
679 vstor_packet
->sub_channel_count
= num_sc
;
681 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
682 (sizeof(struct vstor_packet
) -
684 (unsigned long)request
,
686 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
691 t
= wait_for_completion_timeout(&request
->wait_event
, 10*HZ
);
695 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
696 vstor_packet
->status
!= 0)
700 * Now that we created the sub-channels, invoke the check; this
701 * may trigger the callback.
703 stor_device
->open_sub_channel
= true;
704 vmbus_are_subchannels_present(device
->channel
);
707 static void cache_wwn(struct storvsc_device
*stor_device
,
708 struct vstor_packet
*vstor_packet
)
711 * Cache the currently active port and node ww names.
713 if (vstor_packet
->wwn_packet
.primary_active
) {
714 stor_device
->node_name
=
715 wwn_to_u64(vstor_packet
->wwn_packet
.primary_node_wwn
);
716 stor_device
->port_name
=
717 wwn_to_u64(vstor_packet
->wwn_packet
.primary_port_wwn
);
719 stor_device
->node_name
=
720 wwn_to_u64(vstor_packet
->wwn_packet
.secondary_node_wwn
);
721 stor_device
->port_name
=
722 wwn_to_u64(vstor_packet
->wwn_packet
.secondary_port_wwn
);
727 static int storvsc_execute_vstor_op(struct hv_device
*device
,
728 struct storvsc_cmd_request
*request
,
731 struct vstor_packet
*vstor_packet
;
734 vstor_packet
= &request
->vstor_packet
;
736 init_completion(&request
->wait_event
);
737 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
739 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
740 (sizeof(struct vstor_packet
) -
742 (unsigned long)request
,
744 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
748 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
755 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
||
756 vstor_packet
->status
!= 0)
762 static int storvsc_channel_init(struct hv_device
*device
, bool is_fc
)
764 struct storvsc_device
*stor_device
;
765 struct storvsc_cmd_request
*request
;
766 struct vstor_packet
*vstor_packet
;
769 bool process_sub_channels
= false;
771 stor_device
= get_out_stor_device(device
);
775 request
= &stor_device
->init_request
;
776 vstor_packet
= &request
->vstor_packet
;
779 * Now, initiate the vsc/vsp initialization protocol on the open
782 memset(request
, 0, sizeof(struct storvsc_cmd_request
));
783 vstor_packet
->operation
= VSTOR_OPERATION_BEGIN_INITIALIZATION
;
784 ret
= storvsc_execute_vstor_op(device
, request
, true);
788 * Query host supported protocol version.
791 for (i
= 0; i
< ARRAY_SIZE(vmstor_protocols
); i
++) {
792 /* reuse the packet for version range supported */
793 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
794 vstor_packet
->operation
=
795 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION
;
797 vstor_packet
->version
.major_minor
=
798 vmstor_protocols
[i
].protocol_version
;
801 * The revision number is only used in Windows; set it to 0.
803 vstor_packet
->version
.revision
= 0;
804 ret
= storvsc_execute_vstor_op(device
, request
, false);
808 if (vstor_packet
->operation
!= VSTOR_OPERATION_COMPLETE_IO
)
811 if (vstor_packet
->status
== 0) {
812 vmstor_proto_version
=
813 vmstor_protocols
[i
].protocol_version
;
816 vmstor_protocols
[i
].sense_buffer_size
;
819 vmstor_protocols
[i
].vmscsi_size_delta
;
825 if (vstor_packet
->status
!= 0)
829 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
830 vstor_packet
->operation
= VSTOR_OPERATION_QUERY_PROPERTIES
;
831 ret
= storvsc_execute_vstor_op(device
, request
, true);
836 * Check to see if multi-channel support is there.
837 * Hosts that implement protocol version of 5.1 and above
838 * support multi-channel.
840 max_chns
= vstor_packet
->storage_channel_properties
.max_channel_cnt
;
841 if (vmstor_proto_version
>= VMSTOR_PROTO_VERSION_WIN8
) {
842 if (vstor_packet
->storage_channel_properties
.flags
&
843 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL
)
844 process_sub_channels
= true;
846 stor_device
->max_transfer_bytes
=
847 vstor_packet
->storage_channel_properties
.max_transfer_bytes
;
853 * For FC devices retrieve FC HBA data.
855 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
856 vstor_packet
->operation
= VSTOR_OPERATION_FCHBA_DATA
;
857 ret
= storvsc_execute_vstor_op(device
, request
, true);
862 * Cache the currently active port and node ww names.
864 cache_wwn(stor_device
, vstor_packet
);
868 memset(vstor_packet
, 0, sizeof(struct vstor_packet
));
869 vstor_packet
->operation
= VSTOR_OPERATION_END_INITIALIZATION
;
870 ret
= storvsc_execute_vstor_op(device
, request
, true);
874 if (process_sub_channels
)
875 handle_multichannel_storage(device
, max_chns
);
880 static void storvsc_handle_error(struct vmscsi_request
*vm_srb
,
881 struct scsi_cmnd
*scmnd
,
882 struct Scsi_Host
*host
,
885 struct storvsc_scan_work
*wrk
;
886 void (*process_err_fn
)(struct work_struct
*work
);
887 bool do_work
= false;
889 switch (SRB_STATUS(vm_srb
->srb_status
)) {
890 case SRB_STATUS_ERROR
:
892 * If there is an error; offline the device since all
893 * error recovery strategies would have already been
894 * deployed on the host side. However, if the command
895 * were a pass-through command deal with it appropriately.
897 switch (scmnd
->cmnd
[0]) {
900 set_host_byte(scmnd
, DID_PASSTHROUGH
);
903 * On Some Windows hosts TEST_UNIT_READY command can return
904 * SRB_STATUS_ERROR, let the upper level code deal with it
905 * based on the sense information.
907 case TEST_UNIT_READY
:
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
,
949 struct storvsc_device
*stor_dev
)
951 struct scsi_cmnd
*scmnd
= cmd_request
->cmd
;
952 struct scsi_sense_hdr sense_hdr
;
953 struct vmscsi_request
*vm_srb
;
954 struct Scsi_Host
*host
;
955 u32 payload_sz
= cmd_request
->payload_sz
;
956 void *payload
= cmd_request
->payload
;
958 host
= stor_dev
->host
;
960 vm_srb
= &cmd_request
->vstor_packet
.vm_srb
;
962 scmnd
->result
= vm_srb
->scsi_status
;
965 if (scsi_normalize_sense(scmnd
->sense_buffer
,
966 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
) &&
967 do_logging(STORVSC_LOGGING_ERROR
))
968 scsi_print_sense_hdr(scmnd
->device
, "storvsc",
972 if (vm_srb
->srb_status
!= SRB_STATUS_SUCCESS
)
973 storvsc_handle_error(vm_srb
, scmnd
, host
, sense_hdr
.asc
,
976 scsi_set_resid(scmnd
,
977 cmd_request
->payload
->range
.len
-
978 vm_srb
->data_transfer_length
);
980 scmnd
->scsi_done(scmnd
);
983 sizeof(struct vmbus_channel_packet_multipage_buffer
))
987 static void storvsc_on_io_completion(struct storvsc_device
*stor_device
,
988 struct vstor_packet
*vstor_packet
,
989 struct storvsc_cmd_request
*request
)
991 struct vstor_packet
*stor_pkt
;
992 struct hv_device
*device
= stor_device
->device
;
994 stor_pkt
= &request
->vstor_packet
;
997 * The current SCSI handling on the host side does
998 * not correctly handle:
999 * INQUIRY command with page code parameter set to 0x80
1000 * MODE_SENSE command with cmd[2] == 0x1c
1002 * Setup srb and scsi status so this won't be fatal.
1003 * We do this so we can distinguish truly fatal failues
1004 * (srb status == 0x4) and off-line the device in that case.
1007 if ((stor_pkt
->vm_srb
.cdb
[0] == INQUIRY
) ||
1008 (stor_pkt
->vm_srb
.cdb
[0] == MODE_SENSE
)) {
1009 vstor_packet
->vm_srb
.scsi_status
= 0;
1010 vstor_packet
->vm_srb
.srb_status
= SRB_STATUS_SUCCESS
;
1014 /* Copy over the status...etc */
1015 stor_pkt
->vm_srb
.scsi_status
= vstor_packet
->vm_srb
.scsi_status
;
1016 stor_pkt
->vm_srb
.srb_status
= vstor_packet
->vm_srb
.srb_status
;
1017 stor_pkt
->vm_srb
.sense_info_length
=
1018 vstor_packet
->vm_srb
.sense_info_length
;
1020 if (vstor_packet
->vm_srb
.scsi_status
!= 0 ||
1021 vstor_packet
->vm_srb
.srb_status
!= SRB_STATUS_SUCCESS
)
1022 storvsc_log(device
, STORVSC_LOGGING_WARN
,
1023 "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
1024 stor_pkt
->vm_srb
.cdb
[0],
1025 vstor_packet
->vm_srb
.scsi_status
,
1026 vstor_packet
->vm_srb
.srb_status
);
1028 if ((vstor_packet
->vm_srb
.scsi_status
& 0xFF) == 0x02) {
1029 /* CHECK_CONDITION */
1030 if (vstor_packet
->vm_srb
.srb_status
&
1031 SRB_STATUS_AUTOSENSE_VALID
) {
1032 /* autosense data available */
1034 storvsc_log(device
, STORVSC_LOGGING_WARN
,
1035 "stor pkt %p autosense data valid - len %d\n",
1036 request
, vstor_packet
->vm_srb
.sense_info_length
);
1038 memcpy(request
->cmd
->sense_buffer
,
1039 vstor_packet
->vm_srb
.sense_data
,
1040 vstor_packet
->vm_srb
.sense_info_length
);
1045 stor_pkt
->vm_srb
.data_transfer_length
=
1046 vstor_packet
->vm_srb
.data_transfer_length
;
1048 storvsc_command_completion(request
, stor_device
);
1050 if (atomic_dec_and_test(&stor_device
->num_outstanding_req
) &&
1051 stor_device
->drain_notify
)
1052 wake_up(&stor_device
->waiting_to_drain
);
1057 static void storvsc_on_receive(struct storvsc_device
*stor_device
,
1058 struct vstor_packet
*vstor_packet
,
1059 struct storvsc_cmd_request
*request
)
1061 struct storvsc_scan_work
*work
;
1063 switch (vstor_packet
->operation
) {
1064 case VSTOR_OPERATION_COMPLETE_IO
:
1065 storvsc_on_io_completion(stor_device
, vstor_packet
, request
);
1068 case VSTOR_OPERATION_REMOVE_DEVICE
:
1069 case VSTOR_OPERATION_ENUMERATE_BUS
:
1070 work
= kmalloc(sizeof(struct storvsc_scan_work
), GFP_ATOMIC
);
1074 INIT_WORK(&work
->work
, storvsc_host_scan
);
1075 work
->host
= stor_device
->host
;
1076 schedule_work(&work
->work
);
1079 case VSTOR_OPERATION_FCHBA_DATA
:
1080 cache_wwn(stor_device
, vstor_packet
);
1081 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1082 fc_host_node_name(stor_device
->host
) = stor_device
->node_name
;
1083 fc_host_port_name(stor_device
->host
) = stor_device
->port_name
;
1091 static void storvsc_on_channel_callback(void *context
)
1093 struct vmbus_channel
*channel
= (struct vmbus_channel
*)context
;
1094 struct hv_device
*device
;
1095 struct storvsc_device
*stor_device
;
1098 unsigned char packet
[ALIGN(sizeof(struct vstor_packet
), 8)];
1099 struct storvsc_cmd_request
*request
;
1102 if (channel
->primary_channel
!= NULL
)
1103 device
= channel
->primary_channel
->device_obj
;
1105 device
= channel
->device_obj
;
1107 stor_device
= get_in_stor_device(device
);
1112 ret
= vmbus_recvpacket(channel
, packet
,
1113 ALIGN((sizeof(struct vstor_packet
) -
1114 vmscsi_size_delta
), 8),
1115 &bytes_recvd
, &request_id
);
1116 if (ret
== 0 && bytes_recvd
> 0) {
1118 request
= (struct storvsc_cmd_request
*)
1119 (unsigned long)request_id
;
1121 if ((request
== &stor_device
->init_request
) ||
1122 (request
== &stor_device
->reset_request
)) {
1124 memcpy(&request
->vstor_packet
, packet
,
1125 (sizeof(struct vstor_packet
) -
1126 vmscsi_size_delta
));
1127 complete(&request
->wait_event
);
1129 storvsc_on_receive(stor_device
,
1130 (struct vstor_packet
*)packet
,
1141 static int storvsc_connect_to_vsp(struct hv_device
*device
, u32 ring_size
,
1144 struct vmstorage_channel_properties props
;
1147 memset(&props
, 0, sizeof(struct vmstorage_channel_properties
));
1149 ret
= vmbus_open(device
->channel
,
1153 sizeof(struct vmstorage_channel_properties
),
1154 storvsc_on_channel_callback
, device
->channel
);
1159 ret
= storvsc_channel_init(device
, is_fc
);
1164 static int storvsc_dev_remove(struct hv_device
*device
)
1166 struct storvsc_device
*stor_device
;
1167 unsigned long flags
;
1169 stor_device
= hv_get_drvdata(device
);
1171 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
1172 stor_device
->destroy
= true;
1173 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
1176 * At this point, all outbound traffic should be disable. We
1177 * only allow inbound traffic (responses) to proceed so that
1178 * outstanding requests can be completed.
1181 storvsc_wait_to_drain(stor_device
);
1184 * Since we have already drained, we don't need to busy wait
1185 * as was done in final_release_stor_device()
1186 * Note that we cannot set the ext pointer to NULL until
1187 * we have drained - to drain the outgoing packets, we need to
1188 * allow incoming packets.
1190 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
1191 hv_set_drvdata(device
, NULL
);
1192 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
1194 /* Close the channel */
1195 vmbus_close(device
->channel
);
1201 static int storvsc_do_io(struct hv_device
*device
,
1202 struct storvsc_cmd_request
*request
)
1204 struct storvsc_device
*stor_device
;
1205 struct vstor_packet
*vstor_packet
;
1206 struct vmbus_channel
*outgoing_channel
;
1209 vstor_packet
= &request
->vstor_packet
;
1210 stor_device
= get_out_stor_device(device
);
1216 request
->device
= device
;
1218 * Select an an appropriate channel to send the request out.
1221 outgoing_channel
= vmbus_get_outgoing_channel(device
->channel
);
1224 vstor_packet
->flags
|= REQUEST_COMPLETION_FLAG
;
1226 vstor_packet
->vm_srb
.length
= (sizeof(struct vmscsi_request
) -
1230 vstor_packet
->vm_srb
.sense_info_length
= sense_buffer_size
;
1233 vstor_packet
->vm_srb
.data_transfer_length
=
1234 request
->payload
->range
.len
;
1236 vstor_packet
->operation
= VSTOR_OPERATION_EXECUTE_SRB
;
1238 if (request
->payload
->range
.len
) {
1240 ret
= vmbus_sendpacket_mpb_desc(outgoing_channel
,
1241 request
->payload
, request
->payload_sz
,
1243 (sizeof(struct vstor_packet
) -
1245 (unsigned long)request
);
1247 ret
= vmbus_sendpacket(outgoing_channel
, vstor_packet
,
1248 (sizeof(struct vstor_packet
) -
1250 (unsigned long)request
,
1252 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
1258 atomic_inc(&stor_device
->num_outstanding_req
);
1263 static int storvsc_device_configure(struct scsi_device
*sdevice
)
1266 blk_queue_max_segment_size(sdevice
->request_queue
, PAGE_SIZE
);
1268 blk_queue_bounce_limit(sdevice
->request_queue
, BLK_BOUNCE_ANY
);
1270 blk_queue_rq_timeout(sdevice
->request_queue
, (storvsc_timeout
* HZ
));
1272 /* Ensure there are no gaps in presented sgls */
1273 blk_queue_virt_boundary(sdevice
->request_queue
, PAGE_SIZE
- 1);
1275 sdevice
->no_write_same
= 1;
1278 * Add blist flags to permit the reading of the VPD pages even when
1279 * the target may claim SPC-2 compliance. MSFT targets currently
1280 * claim SPC-2 compliance while they implement post SPC-2 features.
1281 * With this patch we can correctly handle WRITE_SAME_16 issues.
1283 sdevice
->sdev_bflags
|= msft_blist_flags
;
1286 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
1287 * if the device is a MSFT virtual device. If the host is
1288 * WIN10 or newer, allow write_same.
1290 if (!strncmp(sdevice
->vendor
, "Msft", 4)) {
1291 switch (vmstor_proto_version
) {
1292 case VMSTOR_PROTO_VERSION_WIN8
:
1293 case VMSTOR_PROTO_VERSION_WIN8_1
:
1294 sdevice
->scsi_level
= SCSI_SPC_3
;
1298 if (vmstor_proto_version
>= VMSTOR_PROTO_VERSION_WIN10
)
1299 sdevice
->no_write_same
= 0;
1305 static int storvsc_get_chs(struct scsi_device
*sdev
, struct block_device
* bdev
,
1306 sector_t capacity
, int *info
)
1308 sector_t nsect
= capacity
;
1309 sector_t cylinders
= nsect
;
1310 int heads
, sectors_pt
;
1313 * We are making up these values; let us keep it simple.
1316 sectors_pt
= 0x3f; /* Sectors per track */
1317 sector_div(cylinders
, heads
* sectors_pt
);
1318 if ((sector_t
)(cylinders
+ 1) * heads
* sectors_pt
< nsect
)
1322 info
[1] = sectors_pt
;
1323 info
[2] = (int)cylinders
;
1328 static int storvsc_host_reset_handler(struct scsi_cmnd
*scmnd
)
1330 struct hv_host_device
*host_dev
= shost_priv(scmnd
->device
->host
);
1331 struct hv_device
*device
= host_dev
->dev
;
1333 struct storvsc_device
*stor_device
;
1334 struct storvsc_cmd_request
*request
;
1335 struct vstor_packet
*vstor_packet
;
1339 stor_device
= get_out_stor_device(device
);
1343 request
= &stor_device
->reset_request
;
1344 vstor_packet
= &request
->vstor_packet
;
1346 init_completion(&request
->wait_event
);
1348 vstor_packet
->operation
= VSTOR_OPERATION_RESET_BUS
;
1349 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
1350 vstor_packet
->vm_srb
.path_id
= stor_device
->path_id
;
1352 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
1353 (sizeof(struct vstor_packet
) -
1355 (unsigned long)&stor_device
->reset_request
,
1357 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
1361 t
= wait_for_completion_timeout(&request
->wait_event
, 5*HZ
);
1363 return TIMEOUT_ERROR
;
1367 * At this point, all outstanding requests in the adapter
1368 * should have been flushed out and return to us
1369 * There is a potential race here where the host may be in
1370 * the process of responding when we return from here.
1371 * Just wait for all in-transit packets to be accounted for
1372 * before we return from here.
1374 storvsc_wait_to_drain(stor_device
);
1380 * The host guarantees to respond to each command, although I/O latencies might
1381 * be unbounded on Azure. Reset the timer unconditionally to give the host a
1382 * chance to perform EH.
1384 static enum blk_eh_timer_return
storvsc_eh_timed_out(struct scsi_cmnd
*scmnd
)
1386 return BLK_EH_RESET_TIMER
;
1389 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd
*scmnd
)
1391 bool allowed
= true;
1392 u8 scsi_op
= scmnd
->cmnd
[0];
1395 /* the host does not handle WRITE_SAME, log accident usage */
1398 * smartd sends this command and the host does not handle
1399 * this. So, don't send it.
1402 scmnd
->result
= ILLEGAL_REQUEST
<< 16;
1411 static int storvsc_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scmnd
)
1414 struct hv_host_device
*host_dev
= shost_priv(host
);
1415 struct hv_device
*dev
= host_dev
->dev
;
1416 struct storvsc_cmd_request
*cmd_request
= scsi_cmd_priv(scmnd
);
1418 struct scatterlist
*sgl
;
1419 unsigned int sg_count
= 0;
1420 struct vmscsi_request
*vm_srb
;
1421 struct scatterlist
*cur_sgl
;
1422 struct vmbus_packet_mpb_array
*payload
;
1426 if (vmstor_proto_version
<= VMSTOR_PROTO_VERSION_WIN8
) {
1428 * On legacy hosts filter unimplemented commands.
1429 * Future hosts are expected to correctly handle
1430 * unsupported commands. Furthermore, it is
1431 * possible that some of the currently
1432 * unsupported commands maybe supported in
1433 * future versions of the host.
1435 if (!storvsc_scsi_cmd_ok(scmnd
)) {
1436 scmnd
->scsi_done(scmnd
);
1441 /* Setup the cmd request */
1442 cmd_request
->cmd
= scmnd
;
1444 vm_srb
= &cmd_request
->vstor_packet
.vm_srb
;
1445 vm_srb
->win8_extension
.time_out_value
= 60;
1447 vm_srb
->win8_extension
.srb_flags
|=
1448 SRB_FLAGS_DISABLE_SYNCH_TRANSFER
;
1451 switch (scmnd
->sc_data_direction
) {
1453 vm_srb
->data_in
= WRITE_TYPE
;
1454 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_DATA_OUT
;
1456 case DMA_FROM_DEVICE
:
1457 vm_srb
->data_in
= READ_TYPE
;
1458 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_DATA_IN
;
1461 vm_srb
->data_in
= UNKNOWN_TYPE
;
1462 vm_srb
->win8_extension
.srb_flags
|= SRB_FLAGS_NO_DATA_TRANSFER
;
1466 * This is DMA_BIDIRECTIONAL or something else we are never
1467 * supposed to see here.
1469 WARN(1, "Unexpected data direction: %d\n",
1470 scmnd
->sc_data_direction
);
1475 vm_srb
->port_number
= host_dev
->port
;
1476 vm_srb
->path_id
= scmnd
->device
->channel
;
1477 vm_srb
->target_id
= scmnd
->device
->id
;
1478 vm_srb
->lun
= scmnd
->device
->lun
;
1480 vm_srb
->cdb_length
= scmnd
->cmd_len
;
1482 memcpy(vm_srb
->cdb
, scmnd
->cmnd
, vm_srb
->cdb_length
);
1484 sgl
= (struct scatterlist
*)scsi_sglist(scmnd
);
1485 sg_count
= scsi_sg_count(scmnd
);
1487 length
= scsi_bufflen(scmnd
);
1488 payload
= (struct vmbus_packet_mpb_array
*)&cmd_request
->mpb
;
1489 payload_sz
= sizeof(cmd_request
->mpb
);
1492 if (sg_count
> MAX_PAGE_BUFFER_COUNT
) {
1494 payload_sz
= (sg_count
* sizeof(void *) +
1495 sizeof(struct vmbus_packet_mpb_array
));
1496 payload
= kmalloc(payload_sz
, GFP_ATOMIC
);
1498 return SCSI_MLQUEUE_DEVICE_BUSY
;
1501 payload
->range
.len
= length
;
1502 payload
->range
.offset
= sgl
[0].offset
;
1505 for (i
= 0; i
< sg_count
; i
++) {
1506 payload
->range
.pfn_array
[i
] =
1507 page_to_pfn(sg_page((cur_sgl
)));
1508 cur_sgl
= sg_next(cur_sgl
);
1511 } else if (scsi_sglist(scmnd
)) {
1512 payload
->range
.len
= length
;
1513 payload
->range
.offset
=
1514 virt_to_phys(scsi_sglist(scmnd
)) & (PAGE_SIZE
-1);
1515 payload
->range
.pfn_array
[0] =
1516 virt_to_phys(scsi_sglist(scmnd
)) >> PAGE_SHIFT
;
1519 cmd_request
->payload
= payload
;
1520 cmd_request
->payload_sz
= payload_sz
;
1522 /* Invokes the vsc to start an IO */
1523 ret
= storvsc_do_io(dev
, cmd_request
);
1525 if (ret
== -EAGAIN
) {
1527 return SCSI_MLQUEUE_DEVICE_BUSY
;
1533 static struct scsi_host_template scsi_driver
= {
1534 .module
= THIS_MODULE
,
1535 .name
= "storvsc_host_t",
1536 .cmd_size
= sizeof(struct storvsc_cmd_request
),
1537 .bios_param
= storvsc_get_chs
,
1538 .queuecommand
= storvsc_queuecommand
,
1539 .eh_host_reset_handler
= storvsc_host_reset_handler
,
1540 .proc_name
= "storvsc_host",
1541 .eh_timed_out
= storvsc_eh_timed_out
,
1542 .slave_configure
= storvsc_device_configure
,
1545 .use_clustering
= ENABLE_CLUSTERING
,
1546 /* Make sure we dont get a sg segment crosses a page boundary */
1547 .dma_boundary
= PAGE_SIZE
-1,
1557 static const struct hv_vmbus_device_id id_table
[] = {
1560 .driver_data
= SCSI_GUID
1564 .driver_data
= IDE_GUID
1566 /* Fibre Channel GUID */
1569 .driver_data
= SFC_GUID
1574 MODULE_DEVICE_TABLE(vmbus
, id_table
);
1576 static int storvsc_probe(struct hv_device
*device
,
1577 const struct hv_vmbus_device_id
*dev_id
)
1580 int num_cpus
= num_online_cpus();
1581 struct Scsi_Host
*host
;
1582 struct hv_host_device
*host_dev
;
1583 bool dev_is_ide
= ((dev_id
->driver_data
== IDE_GUID
) ? true : false);
1584 bool is_fc
= ((dev_id
->driver_data
== SFC_GUID
) ? true : false);
1586 struct storvsc_device
*stor_device
;
1587 int max_luns_per_target
;
1590 int max_sub_channels
= 0;
1593 * Based on the windows host we are running on,
1594 * set state to properly communicate with the host.
1597 if (vmbus_proto_version
< VERSION_WIN8
) {
1598 max_luns_per_target
= STORVSC_IDE_MAX_LUNS_PER_TARGET
;
1599 max_targets
= STORVSC_IDE_MAX_TARGETS
;
1600 max_channels
= STORVSC_IDE_MAX_CHANNELS
;
1602 max_luns_per_target
= STORVSC_MAX_LUNS_PER_TARGET
;
1603 max_targets
= STORVSC_MAX_TARGETS
;
1604 max_channels
= STORVSC_MAX_CHANNELS
;
1606 * On Windows8 and above, we support sub-channels for storage.
1607 * The number of sub-channels offerred is based on the number of
1608 * VCPUs in the guest.
1610 max_sub_channels
= (num_cpus
/ storvsc_vcpus_per_sub_channel
);
1613 scsi_driver
.can_queue
= (max_outstanding_req_per_channel
*
1614 (max_sub_channels
+ 1));
1616 host
= scsi_host_alloc(&scsi_driver
,
1617 sizeof(struct hv_host_device
));
1621 host_dev
= shost_priv(host
);
1622 memset(host_dev
, 0, sizeof(struct hv_host_device
));
1624 host_dev
->port
= host
->host_no
;
1625 host_dev
->dev
= device
;
1628 stor_device
= kzalloc(sizeof(struct storvsc_device
), GFP_KERNEL
);
1634 stor_device
->destroy
= false;
1635 stor_device
->open_sub_channel
= false;
1636 init_waitqueue_head(&stor_device
->waiting_to_drain
);
1637 stor_device
->device
= device
;
1638 stor_device
->host
= host
;
1639 hv_set_drvdata(device
, stor_device
);
1641 stor_device
->port_number
= host
->host_no
;
1642 ret
= storvsc_connect_to_vsp(device
, storvsc_ringbuffer_size
, is_fc
);
1646 host_dev
->path
= stor_device
->path_id
;
1647 host_dev
->target
= stor_device
->target_id
;
1649 switch (dev_id
->driver_data
) {
1651 host
->max_lun
= STORVSC_FC_MAX_LUNS_PER_TARGET
;
1652 host
->max_id
= STORVSC_FC_MAX_TARGETS
;
1653 host
->max_channel
= STORVSC_FC_MAX_CHANNELS
- 1;
1654 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1655 host
->transportt
= fc_transport_template
;
1660 host
->max_lun
= max_luns_per_target
;
1661 host
->max_id
= max_targets
;
1662 host
->max_channel
= max_channels
- 1;
1666 host
->max_lun
= STORVSC_IDE_MAX_LUNS_PER_TARGET
;
1667 host
->max_id
= STORVSC_IDE_MAX_TARGETS
;
1668 host
->max_channel
= STORVSC_IDE_MAX_CHANNELS
- 1;
1671 /* max cmd length */
1672 host
->max_cmd_len
= STORVSC_MAX_CMD_LEN
;
1675 * set the table size based on the info we got
1678 host
->sg_tablesize
= (stor_device
->max_transfer_bytes
>> PAGE_SHIFT
);
1680 /* Register the HBA and start the scsi bus scan */
1681 ret
= scsi_add_host(host
, &device
->device
);
1686 scsi_scan_host(host
);
1688 target
= (device
->dev_instance
.b
[5] << 8 |
1689 device
->dev_instance
.b
[4]);
1690 ret
= scsi_add_device(host
, 0, target
, 0);
1692 scsi_remove_host(host
);
1696 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1697 if (host
->transportt
== fc_transport_template
) {
1698 fc_host_node_name(host
) = stor_device
->node_name
;
1699 fc_host_port_name(host
) = stor_device
->port_name
;
1706 * Once we have connected with the host, we would need to
1707 * to invoke storvsc_dev_remove() to rollback this state and
1708 * this call also frees up the stor_device; hence the jump around
1711 storvsc_dev_remove(device
);
1718 scsi_host_put(host
);
1722 static int storvsc_remove(struct hv_device
*dev
)
1724 struct storvsc_device
*stor_device
= hv_get_drvdata(dev
);
1725 struct Scsi_Host
*host
= stor_device
->host
;
1727 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1728 if (host
->transportt
== fc_transport_template
)
1729 fc_remove_host(host
);
1731 scsi_remove_host(host
);
1732 storvsc_dev_remove(dev
);
1733 scsi_host_put(host
);
1738 static struct hv_driver storvsc_drv
= {
1739 .name
= KBUILD_MODNAME
,
1740 .id_table
= id_table
,
1741 .probe
= storvsc_probe
,
1742 .remove
= storvsc_remove
,
1745 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1746 static struct fc_function_template fc_transport_functions
= {
1747 .show_host_node_name
= 1,
1748 .show_host_port_name
= 1,
1752 static int __init
storvsc_drv_init(void)
1757 * Divide the ring buffer data size (which is 1 page less
1758 * than the ring buffer size since that page is reserved for
1759 * the ring buffer indices) by the max request size (which is
1760 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1762 max_outstanding_req_per_channel
=
1763 ((storvsc_ringbuffer_size
- PAGE_SIZE
) /
1764 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET
+
1765 sizeof(struct vstor_packet
) + sizeof(u64
) -
1769 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1770 fc_transport_template
= fc_attach_transport(&fc_transport_functions
);
1771 if (!fc_transport_template
)
1775 ret
= vmbus_driver_register(&storvsc_drv
);
1777 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1779 fc_release_transport(fc_transport_template
);
1785 static void __exit
storvsc_drv_exit(void)
1787 vmbus_driver_unregister(&storvsc_drv
);
1788 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1789 fc_release_transport(fc_transport_template
);
1793 MODULE_LICENSE("GPL");
1794 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
1795 module_init(storvsc_drv_init
);
1796 module_exit(storvsc_drv_exit
);