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(storvsc_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);