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>
45 #include <scsi/scsi_transport.h>
48 * All wire protocol details (storage protocol between the guest and the host)
49 * are consolidated here.
51 * Begin protocol definitions.
57 * V1 RC < 2008/1/31: 1.0
58 * V1 RC > 2008/1/31: 2.0
65 #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
68 #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0)
69 #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2)
70 #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1)
71 #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0)
72 #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2)
74 /* Packet structure describing virtual storage requests. */
75 enum vstor_packet_operation {
76 VSTOR_OPERATION_COMPLETE_IO = 1,
77 VSTOR_OPERATION_REMOVE_DEVICE = 2,
78 VSTOR_OPERATION_EXECUTE_SRB = 3,
79 VSTOR_OPERATION_RESET_LUN = 4,
80 VSTOR_OPERATION_RESET_ADAPTER = 5,
81 VSTOR_OPERATION_RESET_BUS = 6,
82 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
83 VSTOR_OPERATION_END_INITIALIZATION = 8,
84 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
85 VSTOR_OPERATION_QUERY_PROPERTIES = 10,
86 VSTOR_OPERATION_ENUMERATE_BUS = 11,
87 VSTOR_OPERATION_FCHBA_DATA = 12,
88 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13,
89 VSTOR_OPERATION_MAXIMUM = 13
93 * WWN packet for Fibre Channel HBA
96 struct hv_fc_wwn_packet {
99 u8 primary_port_wwn[8];
100 u8 primary_node_wwn[8];
101 u8 secondary_port_wwn[8];
102 u8 secondary_node_wwn[8];
111 #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002
112 #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004
113 #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008
114 #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010
115 #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020
116 #define SRB_FLAGS_DATA_IN 0x00000040
117 #define SRB_FLAGS_DATA_OUT 0x00000080
118 #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000
119 #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)
120 #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100
121 #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200
122 #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400
125 * This flag indicates the request is part of the workflow for processing a D3.
127 #define SRB_FLAGS_D3_PROCESSING 0x00000800
128 #define SRB_FLAGS_IS_ACTIVE 0x00010000
129 #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000
130 #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000
131 #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000
132 #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000
133 #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000
134 #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000
135 #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000
136 #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000
137 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000
139 #define SP_UNTAGGED ((unsigned char) ~0)
140 #define SRB_SIMPLE_TAG_REQUEST 0x20
143 * Platform neutral description of a scsi request -
144 * this remains the same across the write regardless of 32/64 bit
145 * note: it's patterned off the SCSI_PASS_THROUGH structure
147 #define STORVSC_MAX_CMD_LEN 0x10
149 #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
150 #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
152 #define STORVSC_SENSE_BUFFER_SIZE 0x14
153 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
156 * Sense buffer size changed in win8; have a run-time
157 * variable to track the size we should use. This value will
158 * likely change during protocol negotiation but it is valid
159 * to start by assuming pre-Win8.
161 static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
164 * The storage protocol version is determined during the
165 * initial exchange with the host. It will indicate which
166 * storage functionality is available in the host.
168 static int vmstor_proto_version;
170 #define STORVSC_LOGGING_NONE 0
171 #define STORVSC_LOGGING_ERROR 1
172 #define STORVSC_LOGGING_WARN 2
174 static int logging_level = STORVSC_LOGGING_ERROR;
175 module_param(logging_level, int, S_IRUGO|S_IWUSR);
176 MODULE_PARM_DESC(logging_level,
177 "Logging level, 0 - None, 1 - Error (default), 2 - Warning.");
179 static inline bool do_logging(int level)
181 return logging_level >= level;
184 #define storvsc_log(dev, level, fmt, ...) \
186 if (do_logging(level)) \
187 dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \
190 struct vmscsi_win8_extension {
192 * The following were added in Windows 8
202 struct vmscsi_request {
213 u8 sense_info_length;
217 u32 data_transfer_length;
220 u8 cdb[STORVSC_MAX_CMD_LEN];
221 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
222 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
225 * The following was added in win8.
227 struct vmscsi_win8_extension win8_extension;
229 } __attribute((packed));
233 * The size of the vmscsi_request has changed in win8. The
234 * additional size is because of new elements added to the
235 * structure. These elements are valid only when we are talking
237 * Track the correction to size we need to apply. This value
238 * will likely change during protocol negotiation but it is
239 * valid to start by assuming pre-Win8.
241 static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
244 * The list of storage protocols in order of preference.
246 struct vmstor_protocol {
247 int protocol_version;
248 int sense_buffer_size;
249 int vmscsi_size_delta;
253 static const struct vmstor_protocol vmstor_protocols[] = {
255 VMSTOR_PROTO_VERSION_WIN10,
256 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE,
260 VMSTOR_PROTO_VERSION_WIN8_1,
261 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE,
265 VMSTOR_PROTO_VERSION_WIN8,
266 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE,
270 VMSTOR_PROTO_VERSION_WIN7,
271 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE,
272 sizeof(struct vmscsi_win8_extension),
275 VMSTOR_PROTO_VERSION_WIN6,
276 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE,
277 sizeof(struct vmscsi_win8_extension),
283 * This structure is sent during the initialization phase to get the different
284 * properties of the channel.
287 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
289 struct vmstorage_channel_properties {
295 u32 max_transfer_bytes;
300 /* This structure is sent during the storage protocol negotiations. */
301 struct vmstorage_protocol_version {
302 /* Major (MSW) and minor (LSW) version numbers. */
306 * Revision number is auto-incremented whenever this file is changed
307 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
308 * definitely indicate incompatibility--but it does indicate mismatched
310 * This is only used on the windows side. Just set it to 0.
315 /* Channel Property Flags */
316 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
317 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
319 struct vstor_packet {
320 /* Requested operation type */
321 enum vstor_packet_operation operation;
323 /* Flags - see below for values */
326 /* Status of the request returned from the server side. */
329 /* Data payload area */
332 * Structure used to forward SCSI commands from the
333 * client to the server.
335 struct vmscsi_request vm_srb;
337 /* Structure used to query channel properties. */
338 struct vmstorage_channel_properties storage_channel_properties;
340 /* Used during version negotiations. */
341 struct vmstorage_protocol_version version;
343 /* Fibre channel address packet */
344 struct hv_fc_wwn_packet wwn_packet;
346 /* Number of sub-channels to create */
347 u16 sub_channel_count;
349 /* This will be the maximum of the union members */
357 * This flag indicates that the server should send back a completion for this
361 #define REQUEST_COMPLETION_FLAG 0x1
363 /* Matches Windows-end */
364 enum storvsc_request_type {
371 * SRB status codes and masks; a subset of the codes used here.
374 #define SRB_STATUS_AUTOSENSE_VALID 0x80
375 #define SRB_STATUS_QUEUE_FROZEN 0x40
376 #define SRB_STATUS_INVALID_LUN 0x20
377 #define SRB_STATUS_SUCCESS 0x01
378 #define SRB_STATUS_ABORTED 0x02
379 #define SRB_STATUS_ERROR 0x04
380 #define SRB_STATUS_DATA_OVERRUN 0x12
382 #define SRB_STATUS(status) \
383 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN))
385 * This is the end of Protocol specific defines.
388 static int storvsc_ringbuffer_size = (256 * PAGE_SIZE);
389 static u32 max_outstanding_req_per_channel;
391 static int storvsc_vcpus_per_sub_channel = 4;
393 module_param(storvsc_ringbuffer_size, int, S_IRUGO);
394 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
396 module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO);
397 MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels");
399 * Timeout in seconds for all devices managed by this driver.
401 static int storvsc_timeout = 180;
403 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
404 static struct scsi_transport_template *fc_transport_template;
407 static void storvsc_on_channel_callback(void *context);
409 #define STORVSC_MAX_LUNS_PER_TARGET 255
410 #define STORVSC_MAX_TARGETS 2
411 #define STORVSC_MAX_CHANNELS 8
413 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255
414 #define STORVSC_FC_MAX_TARGETS 128
415 #define STORVSC_FC_MAX_CHANNELS 8
417 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
418 #define STORVSC_IDE_MAX_TARGETS 1
419 #define STORVSC_IDE_MAX_CHANNELS 1
421 struct storvsc_cmd_request {
422 struct scsi_cmnd *cmd;
424 struct hv_device *device;
426 /* Synchronize the request/response if needed */
427 struct completion wait_event;
429 struct vmbus_channel_packet_multipage_buffer mpb;
430 struct vmbus_packet_mpb_array *payload;
433 struct vstor_packet vstor_packet;
437 /* A storvsc device is a device object that contains a vmbus channel */
438 struct storvsc_device {
439 struct hv_device *device;
443 bool open_sub_channel;
444 atomic_t num_outstanding_req;
445 struct Scsi_Host *host;
447 wait_queue_head_t waiting_to_drain;
450 * Each unique Port/Path/Target represents 1 channel ie scsi
451 * controller. In reality, the pathid, targetid is always 0
452 * and the port is set by us
454 unsigned int port_number;
455 unsigned char path_id;
456 unsigned char target_id;
459 * Max I/O, the device can support.
461 u32 max_transfer_bytes;
463 * Number of sub-channels we will open.
466 struct vmbus_channel **stor_chns;
468 * Mask of CPUs bound to subchannels.
470 struct cpumask alloced_cpus;
471 /* Used for vsc/vsp channel reset process */
472 struct storvsc_cmd_request init_request;
473 struct storvsc_cmd_request reset_request;
475 * Currently active port and node names for FC devices.
479 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
480 struct fc_rport *rport;
484 struct hv_host_device {
485 struct hv_device *dev;
488 unsigned char target;
491 struct storvsc_scan_work {
492 struct work_struct work;
493 struct Scsi_Host *host;
498 static void storvsc_device_scan(struct work_struct *work)
500 struct storvsc_scan_work *wrk;
501 struct scsi_device *sdev;
503 wrk = container_of(work, struct storvsc_scan_work, work);
505 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun);
508 scsi_rescan_device(&sdev->sdev_gendev);
509 scsi_device_put(sdev);
515 static void storvsc_host_scan(struct work_struct *work)
517 struct storvsc_scan_work *wrk;
518 struct Scsi_Host *host;
519 struct scsi_device *sdev;
521 wrk = container_of(work, struct storvsc_scan_work, work);
525 * Before scanning the host, first check to see if any of the
526 * currrently known devices have been hot removed. We issue a
527 * "unit ready" command against all currently known devices.
528 * This I/O will result in an error for devices that have been
529 * removed. As part of handling the I/O error, we remove the device.
531 * When a LUN is added or removed, the host sends us a signal to
532 * scan the host. Thus we are forced to discover the LUNs that
533 * may have been removed this way.
535 mutex_lock(&host->scan_mutex);
536 shost_for_each_device(sdev, host)
537 scsi_test_unit_ready(sdev, 1, 1, NULL);
538 mutex_unlock(&host->scan_mutex);
540 * Now scan the host to discover LUNs that may have been added.
542 scsi_scan_host(host);
547 static void storvsc_remove_lun(struct work_struct *work)
549 struct storvsc_scan_work *wrk;
550 struct scsi_device *sdev;
552 wrk = container_of(work, struct storvsc_scan_work, work);
553 if (!scsi_host_get(wrk->host))
556 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun);
559 scsi_remove_device(sdev);
560 scsi_device_put(sdev);
562 scsi_host_put(wrk->host);
570 * We can get incoming messages from the host that are not in response to
571 * messages that we have sent out. An example of this would be messages
572 * received by the guest to notify dynamic addition/removal of LUNs. To
573 * deal with potential race conditions where the driver may be in the
574 * midst of being unloaded when we might receive an unsolicited message
575 * from the host, we have implemented a mechanism to gurantee sequential
578 * 1) Once the device is marked as being destroyed, we will fail all
580 * 2) We permit incoming messages when the device is being destroyed,
581 * only to properly account for messages already sent out.
584 static inline struct storvsc_device *get_out_stor_device(
585 struct hv_device *device)
587 struct storvsc_device *stor_device;
589 stor_device = hv_get_drvdata(device);
591 if (stor_device && stor_device->destroy)
598 static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
600 dev->drain_notify = true;
601 wait_event(dev->waiting_to_drain,
602 atomic_read(&dev->num_outstanding_req) == 0);
603 dev->drain_notify = false;
606 static inline struct storvsc_device *get_in_stor_device(
607 struct hv_device *device)
609 struct storvsc_device *stor_device;
611 stor_device = hv_get_drvdata(device);
617 * If the device is being destroyed; allow incoming
618 * traffic only to cleanup outstanding requests.
621 if (stor_device->destroy &&
622 (atomic_read(&stor_device->num_outstanding_req) == 0))
630 static void handle_sc_creation(struct vmbus_channel *new_sc)
632 struct hv_device *device = new_sc->primary_channel->device_obj;
633 struct storvsc_device *stor_device;
634 struct vmstorage_channel_properties props;
636 stor_device = get_out_stor_device(device);
640 if (stor_device->open_sub_channel == false)
643 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
646 storvsc_ringbuffer_size,
647 storvsc_ringbuffer_size,
649 sizeof(struct vmstorage_channel_properties),
650 storvsc_on_channel_callback, new_sc);
652 if (new_sc->state == CHANNEL_OPENED_STATE) {
653 stor_device->stor_chns[new_sc->target_cpu] = new_sc;
654 cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus);
658 static void handle_multichannel_storage(struct hv_device *device, int max_chns)
660 struct storvsc_device *stor_device;
662 struct storvsc_cmd_request *request;
663 struct vstor_packet *vstor_packet;
667 * If the number of CPUs is artificially restricted, such as
668 * with maxcpus=1 on the kernel boot line, Hyper-V could offer
669 * sub-channels >= the number of CPUs. These sub-channels
670 * should not be created. The primary channel is already created
671 * and assigned to one CPU, so check against # CPUs - 1.
673 num_sc = min((int)(num_online_cpus() - 1), max_chns);
677 stor_device = get_out_stor_device(device);
681 stor_device->num_sc = num_sc;
682 request = &stor_device->init_request;
683 vstor_packet = &request->vstor_packet;
685 stor_device->open_sub_channel = true;
687 * Establish a handler for dealing with subchannels.
689 vmbus_set_sc_create_callback(device->channel, handle_sc_creation);
692 * Check to see if sub-channels have already been created. This
693 * can happen when this driver is re-loaded after unloading.
696 if (vmbus_are_subchannels_present(device->channel))
699 stor_device->open_sub_channel = false;
701 * Request the host to create sub-channels.
703 memset(request, 0, sizeof(struct storvsc_cmd_request));
704 init_completion(&request->wait_event);
705 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS;
706 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
707 vstor_packet->sub_channel_count = num_sc;
709 ret = vmbus_sendpacket(device->channel, vstor_packet,
710 (sizeof(struct vstor_packet) -
712 (unsigned long)request,
714 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
719 t = wait_for_completion_timeout(&request->wait_event, 10*HZ);
723 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
724 vstor_packet->status != 0)
728 * Now that we created the sub-channels, invoke the check; this
729 * may trigger the callback.
731 stor_device->open_sub_channel = true;
732 vmbus_are_subchannels_present(device->channel);
735 static void cache_wwn(struct storvsc_device *stor_device,
736 struct vstor_packet *vstor_packet)
739 * Cache the currently active port and node ww names.
741 if (vstor_packet->wwn_packet.primary_active) {
742 stor_device->node_name =
743 wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn);
744 stor_device->port_name =
745 wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn);
747 stor_device->node_name =
748 wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn);
749 stor_device->port_name =
750 wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn);
755 static int storvsc_execute_vstor_op(struct hv_device *device,
756 struct storvsc_cmd_request *request,
759 struct vstor_packet *vstor_packet;
762 vstor_packet = &request->vstor_packet;
764 init_completion(&request->wait_event);
765 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
767 ret = vmbus_sendpacket(device->channel, vstor_packet,
768 (sizeof(struct vstor_packet) -
770 (unsigned long)request,
772 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
776 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
783 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
784 vstor_packet->status != 0)
790 static int storvsc_channel_init(struct hv_device *device, bool is_fc)
792 struct storvsc_device *stor_device;
793 struct storvsc_cmd_request *request;
794 struct vstor_packet *vstor_packet;
797 bool process_sub_channels = false;
799 stor_device = get_out_stor_device(device);
803 request = &stor_device->init_request;
804 vstor_packet = &request->vstor_packet;
807 * Now, initiate the vsc/vsp initialization protocol on the open
810 memset(request, 0, sizeof(struct storvsc_cmd_request));
811 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
812 ret = storvsc_execute_vstor_op(device, request, true);
816 * Query host supported protocol version.
819 for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) {
820 /* reuse the packet for version range supported */
821 memset(vstor_packet, 0, sizeof(struct vstor_packet));
822 vstor_packet->operation =
823 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
825 vstor_packet->version.major_minor =
826 vmstor_protocols[i].protocol_version;
829 * The revision number is only used in Windows; set it to 0.
831 vstor_packet->version.revision = 0;
832 ret = storvsc_execute_vstor_op(device, request, false);
836 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO)
839 if (vstor_packet->status == 0) {
840 vmstor_proto_version =
841 vmstor_protocols[i].protocol_version;
844 vmstor_protocols[i].sense_buffer_size;
847 vmstor_protocols[i].vmscsi_size_delta;
853 if (vstor_packet->status != 0)
857 memset(vstor_packet, 0, sizeof(struct vstor_packet));
858 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
859 ret = storvsc_execute_vstor_op(device, request, true);
864 * Check to see if multi-channel support is there.
865 * Hosts that implement protocol version of 5.1 and above
866 * support multi-channel.
868 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
871 * Allocate state to manage the sub-channels.
872 * We allocate an array based on the numbers of possible CPUs
873 * (Hyper-V does not support cpu online/offline).
874 * This Array will be sparseley populated with unique
875 * channels - primary + sub-channels.
876 * We will however populate all the slots to evenly distribute
879 stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *),
881 if (stor_device->stor_chns == NULL)
884 stor_device->stor_chns[device->channel->target_cpu] = device->channel;
885 cpumask_set_cpu(device->channel->target_cpu,
886 &stor_device->alloced_cpus);
888 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) {
889 if (vstor_packet->storage_channel_properties.flags &
890 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
891 process_sub_channels = true;
893 stor_device->max_transfer_bytes =
894 vstor_packet->storage_channel_properties.max_transfer_bytes;
900 * For FC devices retrieve FC HBA data.
902 memset(vstor_packet, 0, sizeof(struct vstor_packet));
903 vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA;
904 ret = storvsc_execute_vstor_op(device, request, true);
909 * Cache the currently active port and node ww names.
911 cache_wwn(stor_device, vstor_packet);
915 memset(vstor_packet, 0, sizeof(struct vstor_packet));
916 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
917 ret = storvsc_execute_vstor_op(device, request, true);
921 if (process_sub_channels)
922 handle_multichannel_storage(device, max_chns);
927 static void storvsc_handle_error(struct vmscsi_request *vm_srb,
928 struct scsi_cmnd *scmnd,
929 struct Scsi_Host *host,
932 struct storvsc_scan_work *wrk;
933 void (*process_err_fn)(struct work_struct *work);
934 bool do_work = false;
936 switch (SRB_STATUS(vm_srb->srb_status)) {
937 case SRB_STATUS_ERROR:
939 * Let upper layer deal with error when
940 * sense message is present.
943 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID)
946 * If there is an error; offline the device since all
947 * error recovery strategies would have already been
948 * deployed on the host side. However, if the command
949 * were a pass-through command deal with it appropriately.
951 switch (scmnd->cmnd[0]) {
954 set_host_byte(scmnd, DID_PASSTHROUGH);
957 * On Some Windows hosts TEST_UNIT_READY command can return
958 * SRB_STATUS_ERROR, let the upper level code deal with it
959 * based on the sense information.
961 case TEST_UNIT_READY:
964 set_host_byte(scmnd, DID_ERROR);
967 case SRB_STATUS_INVALID_LUN:
968 set_host_byte(scmnd, DID_NO_CONNECT);
970 process_err_fn = storvsc_remove_lun;
972 case SRB_STATUS_ABORTED:
973 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID &&
974 (asc == 0x2a) && (ascq == 0x9)) {
976 process_err_fn = storvsc_device_scan;
978 * Retry the I/O that trigerred this.
980 set_host_byte(scmnd, DID_REQUEUE);
989 * We need to schedule work to process this error; schedule it.
991 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
993 set_host_byte(scmnd, DID_TARGET_FAILURE);
998 wrk->lun = vm_srb->lun;
999 wrk->tgt_id = vm_srb->target_id;
1000 INIT_WORK(&wrk->work, process_err_fn);
1001 schedule_work(&wrk->work);
1005 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request,
1006 struct storvsc_device *stor_dev)
1008 struct scsi_cmnd *scmnd = cmd_request->cmd;
1009 struct scsi_sense_hdr sense_hdr;
1010 struct vmscsi_request *vm_srb;
1011 u32 data_transfer_length;
1012 struct Scsi_Host *host;
1013 u32 payload_sz = cmd_request->payload_sz;
1014 void *payload = cmd_request->payload;
1016 host = stor_dev->host;
1018 vm_srb = &cmd_request->vstor_packet.vm_srb;
1019 data_transfer_length = vm_srb->data_transfer_length;
1021 scmnd->result = vm_srb->scsi_status;
1023 if (scmnd->result) {
1024 if (scsi_normalize_sense(scmnd->sense_buffer,
1025 SCSI_SENSE_BUFFERSIZE, &sense_hdr) &&
1026 !(sense_hdr.sense_key == NOT_READY &&
1027 sense_hdr.asc == 0x03A) &&
1028 do_logging(STORVSC_LOGGING_ERROR))
1029 scsi_print_sense_hdr(scmnd->device, "storvsc",
1033 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) {
1034 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
1037 * The Windows driver set data_transfer_length on
1038 * SRB_STATUS_DATA_OVERRUN. On other errors, this value
1039 * is untouched. In these cases we set it to 0.
1041 if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN)
1042 data_transfer_length = 0;
1045 scsi_set_resid(scmnd,
1046 cmd_request->payload->range.len - data_transfer_length);
1048 scmnd->scsi_done(scmnd);
1051 sizeof(struct vmbus_channel_packet_multipage_buffer))
1055 static void storvsc_on_io_completion(struct storvsc_device *stor_device,
1056 struct vstor_packet *vstor_packet,
1057 struct storvsc_cmd_request *request)
1059 struct vstor_packet *stor_pkt;
1060 struct hv_device *device = stor_device->device;
1062 stor_pkt = &request->vstor_packet;
1065 * The current SCSI handling on the host side does
1066 * not correctly handle:
1067 * INQUIRY command with page code parameter set to 0x80
1068 * MODE_SENSE command with cmd[2] == 0x1c
1070 * Setup srb and scsi status so this won't be fatal.
1071 * We do this so we can distinguish truly fatal failues
1072 * (srb status == 0x4) and off-line the device in that case.
1075 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
1076 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
1077 vstor_packet->vm_srb.scsi_status = 0;
1078 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
1082 /* Copy over the status...etc */
1083 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
1084 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
1085 stor_pkt->vm_srb.sense_info_length =
1086 vstor_packet->vm_srb.sense_info_length;
1088 if (vstor_packet->vm_srb.scsi_status != 0 ||
1089 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS)
1090 storvsc_log(device, STORVSC_LOGGING_WARN,
1091 "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
1092 stor_pkt->vm_srb.cdb[0],
1093 vstor_packet->vm_srb.scsi_status,
1094 vstor_packet->vm_srb.srb_status);
1096 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
1097 /* CHECK_CONDITION */
1098 if (vstor_packet->vm_srb.srb_status &
1099 SRB_STATUS_AUTOSENSE_VALID) {
1100 /* autosense data available */
1102 storvsc_log(device, STORVSC_LOGGING_WARN,
1103 "stor pkt %p autosense data valid - len %d\n",
1104 request, vstor_packet->vm_srb.sense_info_length);
1106 memcpy(request->cmd->sense_buffer,
1107 vstor_packet->vm_srb.sense_data,
1108 vstor_packet->vm_srb.sense_info_length);
1113 stor_pkt->vm_srb.data_transfer_length =
1114 vstor_packet->vm_srb.data_transfer_length;
1116 storvsc_command_completion(request, stor_device);
1118 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
1119 stor_device->drain_notify)
1120 wake_up(&stor_device->waiting_to_drain);
1125 static void storvsc_on_receive(struct storvsc_device *stor_device,
1126 struct vstor_packet *vstor_packet,
1127 struct storvsc_cmd_request *request)
1129 struct storvsc_scan_work *work;
1131 switch (vstor_packet->operation) {
1132 case VSTOR_OPERATION_COMPLETE_IO:
1133 storvsc_on_io_completion(stor_device, vstor_packet, request);
1136 case VSTOR_OPERATION_REMOVE_DEVICE:
1137 case VSTOR_OPERATION_ENUMERATE_BUS:
1138 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1142 INIT_WORK(&work->work, storvsc_host_scan);
1143 work->host = stor_device->host;
1144 schedule_work(&work->work);
1147 case VSTOR_OPERATION_FCHBA_DATA:
1148 cache_wwn(stor_device, vstor_packet);
1149 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1150 fc_host_node_name(stor_device->host) = stor_device->node_name;
1151 fc_host_port_name(stor_device->host) = stor_device->port_name;
1159 static void storvsc_on_channel_callback(void *context)
1161 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1162 const struct vmpacket_descriptor *desc;
1163 struct hv_device *device;
1164 struct storvsc_device *stor_device;
1166 if (channel->primary_channel != NULL)
1167 device = channel->primary_channel->device_obj;
1169 device = channel->device_obj;
1171 stor_device = get_in_stor_device(device);
1175 foreach_vmbus_pkt(desc, channel) {
1176 void *packet = hv_pkt_data(desc);
1177 struct storvsc_cmd_request *request;
1179 request = (struct storvsc_cmd_request *)
1180 ((unsigned long)desc->trans_id);
1182 if (request == &stor_device->init_request ||
1183 request == &stor_device->reset_request) {
1184 memcpy(&request->vstor_packet, packet,
1185 (sizeof(struct vstor_packet) - vmscsi_size_delta));
1186 complete(&request->wait_event);
1188 storvsc_on_receive(stor_device, packet, request);
1193 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size,
1196 struct vmstorage_channel_properties props;
1199 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
1201 ret = vmbus_open(device->channel,
1205 sizeof(struct vmstorage_channel_properties),
1206 storvsc_on_channel_callback, device->channel);
1211 ret = storvsc_channel_init(device, is_fc);
1216 static int storvsc_dev_remove(struct hv_device *device)
1218 struct storvsc_device *stor_device;
1220 stor_device = hv_get_drvdata(device);
1222 stor_device->destroy = true;
1224 /* Make sure flag is set before waiting */
1228 * At this point, all outbound traffic should be disable. We
1229 * only allow inbound traffic (responses) to proceed so that
1230 * outstanding requests can be completed.
1233 storvsc_wait_to_drain(stor_device);
1236 * Since we have already drained, we don't need to busy wait
1237 * as was done in final_release_stor_device()
1238 * Note that we cannot set the ext pointer to NULL until
1239 * we have drained - to drain the outgoing packets, we need to
1240 * allow incoming packets.
1242 hv_set_drvdata(device, NULL);
1244 /* Close the channel */
1245 vmbus_close(device->channel);
1247 kfree(stor_device->stor_chns);
1252 static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device,
1257 struct cpumask alloced_mask;
1258 int num_channels, tgt_cpu;
1260 if (stor_device->num_sc == 0)
1261 return stor_device->device->channel;
1264 * Our channel array is sparsley populated and we
1265 * initiated I/O on a processor/hw-q that does not
1266 * currently have a designated channel. Fix this.
1267 * The strategy is simple:
1268 * I. Ensure NUMA locality
1269 * II. Distribute evenly (best effort)
1270 * III. Mapping is persistent.
1273 cpumask_and(&alloced_mask, &stor_device->alloced_cpus,
1274 cpumask_of_node(cpu_to_node(q_num)));
1276 num_channels = cpumask_weight(&alloced_mask);
1277 if (num_channels == 0)
1278 return stor_device->device->channel;
1281 while (hash_qnum >= num_channels)
1282 hash_qnum -= num_channels;
1284 for_each_cpu(tgt_cpu, &alloced_mask) {
1285 if (slot == hash_qnum)
1290 stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu];
1292 return stor_device->stor_chns[q_num];
1296 static int storvsc_do_io(struct hv_device *device,
1297 struct storvsc_cmd_request *request, u16 q_num)
1299 struct storvsc_device *stor_device;
1300 struct vstor_packet *vstor_packet;
1301 struct vmbus_channel *outgoing_channel;
1303 struct cpumask alloced_mask;
1306 vstor_packet = &request->vstor_packet;
1307 stor_device = get_out_stor_device(device);
1313 request->device = device;
1315 * Select an an appropriate channel to send the request out.
1318 if (stor_device->stor_chns[q_num] != NULL) {
1319 outgoing_channel = stor_device->stor_chns[q_num];
1320 if (outgoing_channel->target_cpu == smp_processor_id()) {
1322 * Ideally, we want to pick a different channel if
1323 * available on the same NUMA node.
1325 cpumask_and(&alloced_mask, &stor_device->alloced_cpus,
1326 cpumask_of_node(cpu_to_node(q_num)));
1327 for_each_cpu(tgt_cpu, &alloced_mask) {
1328 if (tgt_cpu != outgoing_channel->target_cpu) {
1330 stor_device->stor_chns[tgt_cpu];
1336 outgoing_channel = get_og_chn(stor_device, q_num);
1340 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
1342 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
1346 vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
1349 vstor_packet->vm_srb.data_transfer_length =
1350 request->payload->range.len;
1352 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
1354 if (request->payload->range.len) {
1356 ret = vmbus_sendpacket_mpb_desc(outgoing_channel,
1357 request->payload, request->payload_sz,
1359 (sizeof(struct vstor_packet) -
1361 (unsigned long)request);
1363 ret = vmbus_sendpacket(outgoing_channel, vstor_packet,
1364 (sizeof(struct vstor_packet) -
1366 (unsigned long)request,
1368 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1374 atomic_inc(&stor_device->num_outstanding_req);
1379 static int storvsc_device_alloc(struct scsi_device *sdevice)
1382 * Set blist flag to permit the reading of the VPD pages even when
1383 * the target may claim SPC-2 compliance. MSFT targets currently
1384 * claim SPC-2 compliance while they implement post SPC-2 features.
1385 * With this flag we can correctly handle WRITE_SAME_16 issues.
1387 * Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but
1388 * still supports REPORT LUN.
1390 sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES;
1395 static int storvsc_device_configure(struct scsi_device *sdevice)
1398 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
1400 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
1402 /* Ensure there are no gaps in presented sgls */
1403 blk_queue_virt_boundary(sdevice->request_queue, PAGE_SIZE - 1);
1405 sdevice->no_write_same = 1;
1408 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
1409 * if the device is a MSFT virtual device. If the host is
1410 * WIN10 or newer, allow write_same.
1412 if (!strncmp(sdevice->vendor, "Msft", 4)) {
1413 switch (vmstor_proto_version) {
1414 case VMSTOR_PROTO_VERSION_WIN8:
1415 case VMSTOR_PROTO_VERSION_WIN8_1:
1416 sdevice->scsi_level = SCSI_SPC_3;
1420 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10)
1421 sdevice->no_write_same = 0;
1427 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1428 sector_t capacity, int *info)
1430 sector_t nsect = capacity;
1431 sector_t cylinders = nsect;
1432 int heads, sectors_pt;
1435 * We are making up these values; let us keep it simple.
1438 sectors_pt = 0x3f; /* Sectors per track */
1439 sector_div(cylinders, heads * sectors_pt);
1440 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1444 info[1] = sectors_pt;
1445 info[2] = (int)cylinders;
1450 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
1452 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1453 struct hv_device *device = host_dev->dev;
1455 struct storvsc_device *stor_device;
1456 struct storvsc_cmd_request *request;
1457 struct vstor_packet *vstor_packet;
1461 stor_device = get_out_stor_device(device);
1465 request = &stor_device->reset_request;
1466 vstor_packet = &request->vstor_packet;
1468 init_completion(&request->wait_event);
1470 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1471 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1472 vstor_packet->vm_srb.path_id = stor_device->path_id;
1474 ret = vmbus_sendpacket(device->channel, vstor_packet,
1475 (sizeof(struct vstor_packet) -
1477 (unsigned long)&stor_device->reset_request,
1479 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1483 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
1485 return TIMEOUT_ERROR;
1489 * At this point, all outstanding requests in the adapter
1490 * should have been flushed out and return to us
1491 * There is a potential race here where the host may be in
1492 * the process of responding when we return from here.
1493 * Just wait for all in-transit packets to be accounted for
1494 * before we return from here.
1496 storvsc_wait_to_drain(stor_device);
1502 * The host guarantees to respond to each command, although I/O latencies might
1503 * be unbounded on Azure. Reset the timer unconditionally to give the host a
1504 * chance to perform EH.
1506 static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
1508 return BLK_EH_RESET_TIMER;
1511 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
1513 bool allowed = true;
1514 u8 scsi_op = scmnd->cmnd[0];
1517 /* the host does not handle WRITE_SAME, log accident usage */
1520 * smartd sends this command and the host does not handle
1521 * this. So, don't send it.
1524 scmnd->result = ILLEGAL_REQUEST << 16;
1533 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
1536 struct hv_host_device *host_dev = shost_priv(host);
1537 struct hv_device *dev = host_dev->dev;
1538 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd);
1540 struct scatterlist *sgl;
1541 unsigned int sg_count = 0;
1542 struct vmscsi_request *vm_srb;
1543 struct scatterlist *cur_sgl;
1544 struct vmbus_packet_mpb_array *payload;
1548 if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) {
1550 * On legacy hosts filter unimplemented commands.
1551 * Future hosts are expected to correctly handle
1552 * unsupported commands. Furthermore, it is
1553 * possible that some of the currently
1554 * unsupported commands maybe supported in
1555 * future versions of the host.
1557 if (!storvsc_scsi_cmd_ok(scmnd)) {
1558 scmnd->scsi_done(scmnd);
1563 /* Setup the cmd request */
1564 cmd_request->cmd = scmnd;
1566 vm_srb = &cmd_request->vstor_packet.vm_srb;
1567 vm_srb->win8_extension.time_out_value = 60;
1569 vm_srb->win8_extension.srb_flags |=
1570 SRB_FLAGS_DISABLE_SYNCH_TRANSFER;
1572 if (scmnd->device->tagged_supported) {
1573 vm_srb->win8_extension.srb_flags |=
1574 (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE);
1575 vm_srb->win8_extension.queue_tag = SP_UNTAGGED;
1576 vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST;
1580 switch (scmnd->sc_data_direction) {
1582 vm_srb->data_in = WRITE_TYPE;
1583 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
1585 case DMA_FROM_DEVICE:
1586 vm_srb->data_in = READ_TYPE;
1587 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
1590 vm_srb->data_in = UNKNOWN_TYPE;
1591 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER;
1595 * This is DMA_BIDIRECTIONAL or something else we are never
1596 * supposed to see here.
1598 WARN(1, "Unexpected data direction: %d\n",
1599 scmnd->sc_data_direction);
1604 vm_srb->port_number = host_dev->port;
1605 vm_srb->path_id = scmnd->device->channel;
1606 vm_srb->target_id = scmnd->device->id;
1607 vm_srb->lun = scmnd->device->lun;
1609 vm_srb->cdb_length = scmnd->cmd_len;
1611 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1613 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1614 sg_count = scsi_sg_count(scmnd);
1616 length = scsi_bufflen(scmnd);
1617 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb;
1618 payload_sz = sizeof(cmd_request->mpb);
1621 if (sg_count > MAX_PAGE_BUFFER_COUNT) {
1623 payload_sz = (sg_count * sizeof(u64) +
1624 sizeof(struct vmbus_packet_mpb_array));
1625 payload = kzalloc(payload_sz, GFP_ATOMIC);
1627 return SCSI_MLQUEUE_DEVICE_BUSY;
1630 payload->range.len = length;
1631 payload->range.offset = sgl[0].offset;
1634 for (i = 0; i < sg_count; i++) {
1635 payload->range.pfn_array[i] =
1636 page_to_pfn(sg_page((cur_sgl)));
1637 cur_sgl = sg_next(cur_sgl);
1641 cmd_request->payload = payload;
1642 cmd_request->payload_sz = payload_sz;
1644 /* Invokes the vsc to start an IO */
1645 ret = storvsc_do_io(dev, cmd_request, get_cpu());
1648 if (ret == -EAGAIN) {
1649 if (payload_sz > sizeof(cmd_request->mpb))
1652 return SCSI_MLQUEUE_DEVICE_BUSY;
1658 static struct scsi_host_template scsi_driver = {
1659 .module = THIS_MODULE,
1660 .name = "storvsc_host_t",
1661 .cmd_size = sizeof(struct storvsc_cmd_request),
1662 .bios_param = storvsc_get_chs,
1663 .queuecommand = storvsc_queuecommand,
1664 .eh_host_reset_handler = storvsc_host_reset_handler,
1665 .proc_name = "storvsc_host",
1666 .eh_timed_out = storvsc_eh_timed_out,
1667 .slave_alloc = storvsc_device_alloc,
1668 .slave_configure = storvsc_device_configure,
1669 .cmd_per_lun = 2048,
1671 .use_clustering = ENABLE_CLUSTERING,
1672 /* Make sure we dont get a sg segment crosses a page boundary */
1673 .dma_boundary = PAGE_SIZE-1,
1675 .track_queue_depth = 1,
1684 static const struct hv_vmbus_device_id id_table[] = {
1687 .driver_data = SCSI_GUID
1691 .driver_data = IDE_GUID
1693 /* Fibre Channel GUID */
1696 .driver_data = SFC_GUID
1701 MODULE_DEVICE_TABLE(vmbus, id_table);
1703 static int storvsc_probe(struct hv_device *device,
1704 const struct hv_vmbus_device_id *dev_id)
1707 int num_cpus = num_online_cpus();
1708 struct Scsi_Host *host;
1709 struct hv_host_device *host_dev;
1710 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
1711 bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false);
1713 struct storvsc_device *stor_device;
1714 int max_luns_per_target;
1717 int max_sub_channels = 0;
1720 * Based on the windows host we are running on,
1721 * set state to properly communicate with the host.
1724 if (vmbus_proto_version < VERSION_WIN8) {
1725 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET;
1726 max_targets = STORVSC_IDE_MAX_TARGETS;
1727 max_channels = STORVSC_IDE_MAX_CHANNELS;
1729 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET;
1730 max_targets = STORVSC_MAX_TARGETS;
1731 max_channels = STORVSC_MAX_CHANNELS;
1733 * On Windows8 and above, we support sub-channels for storage
1734 * on SCSI and FC controllers.
1735 * The number of sub-channels offerred is based on the number of
1736 * VCPUs in the guest.
1740 (num_cpus - 1) / storvsc_vcpus_per_sub_channel;
1743 scsi_driver.can_queue = (max_outstanding_req_per_channel *
1744 (max_sub_channels + 1));
1746 host = scsi_host_alloc(&scsi_driver,
1747 sizeof(struct hv_host_device));
1751 host_dev = shost_priv(host);
1752 memset(host_dev, 0, sizeof(struct hv_host_device));
1754 host_dev->port = host->host_no;
1755 host_dev->dev = device;
1758 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
1764 stor_device->destroy = false;
1765 stor_device->open_sub_channel = false;
1766 init_waitqueue_head(&stor_device->waiting_to_drain);
1767 stor_device->device = device;
1768 stor_device->host = host;
1769 hv_set_drvdata(device, stor_device);
1771 stor_device->port_number = host->host_no;
1772 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc);
1776 host_dev->path = stor_device->path_id;
1777 host_dev->target = stor_device->target_id;
1779 switch (dev_id->driver_data) {
1781 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET;
1782 host->max_id = STORVSC_FC_MAX_TARGETS;
1783 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1;
1784 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1785 host->transportt = fc_transport_template;
1790 host->max_lun = max_luns_per_target;
1791 host->max_id = max_targets;
1792 host->max_channel = max_channels - 1;
1796 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET;
1797 host->max_id = STORVSC_IDE_MAX_TARGETS;
1798 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1;
1801 /* max cmd length */
1802 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
1805 * set the table size based on the info we got
1808 host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT);
1810 * Set the number of HW queues we are supporting.
1812 if (stor_device->num_sc != 0)
1813 host->nr_hw_queues = stor_device->num_sc + 1;
1815 /* Register the HBA and start the scsi bus scan */
1816 ret = scsi_add_host(host, &device->device);
1821 scsi_scan_host(host);
1823 target = (device->dev_instance.b[5] << 8 |
1824 device->dev_instance.b[4]);
1825 ret = scsi_add_device(host, 0, target, 0);
1829 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1830 if (host->transportt == fc_transport_template) {
1831 struct fc_rport_identifiers ids = {
1832 .roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR,
1835 fc_host_node_name(host) = stor_device->node_name;
1836 fc_host_port_name(host) = stor_device->port_name;
1837 stor_device->rport = fc_remote_port_add(host, 0, &ids);
1838 if (!stor_device->rport) {
1847 scsi_remove_host(host);
1851 * Once we have connected with the host, we would need to
1852 * to invoke storvsc_dev_remove() to rollback this state and
1853 * this call also frees up the stor_device; hence the jump around
1856 storvsc_dev_remove(device);
1860 kfree(stor_device->stor_chns);
1864 scsi_host_put(host);
1868 static int storvsc_remove(struct hv_device *dev)
1870 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1871 struct Scsi_Host *host = stor_device->host;
1873 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1874 if (host->transportt == fc_transport_template) {
1875 fc_remote_port_delete(stor_device->rport);
1876 fc_remove_host(host);
1879 scsi_remove_host(host);
1880 storvsc_dev_remove(dev);
1881 scsi_host_put(host);
1886 static struct hv_driver storvsc_drv = {
1887 .name = KBUILD_MODNAME,
1888 .id_table = id_table,
1889 .probe = storvsc_probe,
1890 .remove = storvsc_remove,
1893 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1894 static struct fc_function_template fc_transport_functions = {
1895 .show_host_node_name = 1,
1896 .show_host_port_name = 1,
1900 static int __init storvsc_drv_init(void)
1905 * Divide the ring buffer data size (which is 1 page less
1906 * than the ring buffer size since that page is reserved for
1907 * the ring buffer indices) by the max request size (which is
1908 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1910 max_outstanding_req_per_channel =
1911 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1912 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
1913 sizeof(struct vstor_packet) + sizeof(u64) -
1917 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1918 fc_transport_template = fc_attach_transport(&fc_transport_functions);
1919 if (!fc_transport_template)
1923 ret = vmbus_driver_register(&storvsc_drv);
1925 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1927 fc_release_transport(fc_transport_template);
1933 static void __exit storvsc_drv_exit(void)
1935 vmbus_driver_unregister(&storvsc_drv);
1936 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
1937 fc_release_transport(fc_transport_template);
1941 MODULE_LICENSE("GPL");
1942 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
1943 module_init(storvsc_drv_init);
1944 module_exit(storvsc_drv_exit);