2 * Copyright (c) 2009, Microsoft Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 * K. Y. Srinivasan <kys@microsoft.com>
23 #include <linux/kernel.h>
24 #include <linux/wait.h>
25 #include <linux/sched.h>
26 #include <linux/completion.h>
27 #include <linux/string.h>
29 #include <linux/delay.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/module.h>
33 #include <linux/device.h>
34 #include <linux/hyperv.h>
35 #include <linux/blkdev.h>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <scsi/scsi_host.h>
39 #include <scsi/scsi_device.h>
40 #include <scsi/scsi_tcq.h>
41 #include <scsi/scsi_eh.h>
42 #include <scsi/scsi_devinfo.h>
43 #include <scsi/scsi_dbg.h>
46 * All wire protocol details (storage protocol between the guest and the host)
47 * are consolidated here.
49 * Begin protocol definitions.
55 * V1 RC < 2008/1/31: 1.0
56 * V1 RC > 2008/1/31: 2.0
62 #define VMSTOR_WIN7_MAJOR 4
63 #define VMSTOR_WIN7_MINOR 2
65 #define VMSTOR_WIN8_MAJOR 5
66 #define VMSTOR_WIN8_MINOR 1
69 /* Packet structure describing virtual storage requests. */
70 enum vstor_packet_operation {
71 VSTOR_OPERATION_COMPLETE_IO = 1,
72 VSTOR_OPERATION_REMOVE_DEVICE = 2,
73 VSTOR_OPERATION_EXECUTE_SRB = 3,
74 VSTOR_OPERATION_RESET_LUN = 4,
75 VSTOR_OPERATION_RESET_ADAPTER = 5,
76 VSTOR_OPERATION_RESET_BUS = 6,
77 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
78 VSTOR_OPERATION_END_INITIALIZATION = 8,
79 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
80 VSTOR_OPERATION_QUERY_PROPERTIES = 10,
81 VSTOR_OPERATION_ENUMERATE_BUS = 11,
82 VSTOR_OPERATION_FCHBA_DATA = 12,
83 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13,
84 VSTOR_OPERATION_MAXIMUM = 13
88 * WWN packet for Fibre Channel HBA
91 struct hv_fc_wwn_packet {
95 u8 primary_port_wwn[8];
96 u8 primary_node_wwn[8];
97 u8 secondary_port_wwn[8];
98 u8 secondary_node_wwn[8];
107 #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002
108 #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004
109 #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008
110 #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010
111 #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020
112 #define SRB_FLAGS_DATA_IN 0x00000040
113 #define SRB_FLAGS_DATA_OUT 0x00000080
114 #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000
115 #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)
116 #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100
117 #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200
118 #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400
121 * This flag indicates the request is part of the workflow for processing a D3.
123 #define SRB_FLAGS_D3_PROCESSING 0x00000800
124 #define SRB_FLAGS_IS_ACTIVE 0x00010000
125 #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000
126 #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000
127 #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000
128 #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000
129 #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000
130 #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000
131 #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000
132 #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000
133 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000
137 * Platform neutral description of a scsi request -
138 * this remains the same across the write regardless of 32/64 bit
139 * note: it's patterned off the SCSI_PASS_THROUGH structure
141 #define STORVSC_MAX_CMD_LEN 0x10
143 #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
144 #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
146 #define STORVSC_SENSE_BUFFER_SIZE 0x14
147 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
150 * Sense buffer size changed in win8; have a run-time
151 * variable to track the size we should use.
153 static int sense_buffer_size;
156 * The size of the vmscsi_request has changed in win8. The
157 * additional size is because of new elements added to the
158 * structure. These elements are valid only when we are talking
160 * Track the correction to size we need to apply.
163 static int vmscsi_size_delta;
164 static int vmstor_current_major;
165 static int vmstor_current_minor;
167 struct vmscsi_win8_extension {
169 * The following were added in Windows 8
179 struct vmscsi_request {
190 u8 sense_info_length;
194 u32 data_transfer_length;
197 u8 cdb[STORVSC_MAX_CMD_LEN];
198 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
199 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
202 * The following was added in win8.
204 struct vmscsi_win8_extension win8_extension;
206 } __attribute((packed));
210 * This structure is sent during the intialization phase to get the different
211 * properties of the channel.
214 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
216 struct vmstorage_channel_properties {
222 u32 max_transfer_bytes;
227 /* This structure is sent during the storage protocol negotiations. */
228 struct vmstorage_protocol_version {
229 /* Major (MSW) and minor (LSW) version numbers. */
233 * Revision number is auto-incremented whenever this file is changed
234 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
235 * definitely indicate incompatibility--but it does indicate mismatched
237 * This is only used on the windows side. Just set it to 0.
242 /* Channel Property Flags */
243 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
244 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
246 struct vstor_packet {
247 /* Requested operation type */
248 enum vstor_packet_operation operation;
250 /* Flags - see below for values */
253 /* Status of the request returned from the server side. */
256 /* Data payload area */
259 * Structure used to forward SCSI commands from the
260 * client to the server.
262 struct vmscsi_request vm_srb;
264 /* Structure used to query channel properties. */
265 struct vmstorage_channel_properties storage_channel_properties;
267 /* Used during version negotiations. */
268 struct vmstorage_protocol_version version;
270 /* Fibre channel address packet */
271 struct hv_fc_wwn_packet wwn_packet;
273 /* Number of sub-channels to create */
274 u16 sub_channel_count;
276 /* This will be the maximum of the union members */
284 * This flag indicates that the server should send back a completion for this
288 #define REQUEST_COMPLETION_FLAG 0x1
290 /* Matches Windows-end */
291 enum storvsc_request_type {
298 * SRB status codes and masks; a subset of the codes used here.
301 #define SRB_STATUS_AUTOSENSE_VALID 0x80
302 #define SRB_STATUS_INVALID_LUN 0x20
303 #define SRB_STATUS_SUCCESS 0x01
304 #define SRB_STATUS_ABORTED 0x02
305 #define SRB_STATUS_ERROR 0x04
308 * This is the end of Protocol specific defines.
311 static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
313 module_param(storvsc_ringbuffer_size, int, S_IRUGO);
314 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
317 * Timeout in seconds for all devices managed by this driver.
319 static int storvsc_timeout = 180;
321 static int msft_blist_flags = BLIST_TRY_VPD_PAGES;
323 #define STORVSC_MAX_IO_REQUESTS 200
325 static void storvsc_on_channel_callback(void *context);
327 #define STORVSC_MAX_LUNS_PER_TARGET 255
328 #define STORVSC_MAX_TARGETS 2
329 #define STORVSC_MAX_CHANNELS 8
331 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255
332 #define STORVSC_FC_MAX_TARGETS 128
333 #define STORVSC_FC_MAX_CHANNELS 8
335 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
336 #define STORVSC_IDE_MAX_TARGETS 1
337 #define STORVSC_IDE_MAX_CHANNELS 1
339 struct storvsc_cmd_request {
340 struct scsi_cmnd *cmd;
342 unsigned int bounce_sgl_count;
343 struct scatterlist *bounce_sgl;
345 struct hv_device *device;
347 /* Synchronize the request/response if needed */
348 struct completion wait_event;
350 struct hv_multipage_buffer data_buffer;
351 struct vstor_packet vstor_packet;
355 /* A storvsc device is a device object that contains a vmbus channel */
356 struct storvsc_device {
357 struct hv_device *device;
361 bool open_sub_channel;
362 atomic_t num_outstanding_req;
363 struct Scsi_Host *host;
365 wait_queue_head_t waiting_to_drain;
368 * Each unique Port/Path/Target represents 1 channel ie scsi
369 * controller. In reality, the pathid, targetid is always 0
370 * and the port is set by us
372 unsigned int port_number;
373 unsigned char path_id;
374 unsigned char target_id;
376 /* Used for vsc/vsp channel reset process */
377 struct storvsc_cmd_request init_request;
378 struct storvsc_cmd_request reset_request;
381 struct hv_host_device {
382 struct hv_device *dev;
385 unsigned char target;
388 struct storvsc_scan_work {
389 struct work_struct work;
390 struct Scsi_Host *host;
394 static void storvsc_device_scan(struct work_struct *work)
396 struct storvsc_scan_work *wrk;
398 struct scsi_device *sdev;
400 wrk = container_of(work, struct storvsc_scan_work, work);
403 sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
406 scsi_rescan_device(&sdev->sdev_gendev);
407 scsi_device_put(sdev);
413 static void storvsc_host_scan(struct work_struct *work)
415 struct storvsc_scan_work *wrk;
416 struct Scsi_Host *host;
417 struct scsi_device *sdev;
420 wrk = container_of(work, struct storvsc_scan_work, work);
424 * Before scanning the host, first check to see if any of the
425 * currrently known devices have been hot removed. We issue a
426 * "unit ready" command against all currently known devices.
427 * This I/O will result in an error for devices that have been
428 * removed. As part of handling the I/O error, we remove the device.
430 * When a LUN is added or removed, the host sends us a signal to
431 * scan the host. Thus we are forced to discover the LUNs that
432 * may have been removed this way.
434 mutex_lock(&host->scan_mutex);
435 spin_lock_irqsave(host->host_lock, flags);
436 list_for_each_entry(sdev, &host->__devices, siblings) {
437 spin_unlock_irqrestore(host->host_lock, flags);
438 scsi_test_unit_ready(sdev, 1, 1, NULL);
439 spin_lock_irqsave(host->host_lock, flags);
442 spin_unlock_irqrestore(host->host_lock, flags);
443 mutex_unlock(&host->scan_mutex);
445 * Now scan the host to discover LUNs that may have been added.
447 scsi_scan_host(host);
452 static void storvsc_remove_lun(struct work_struct *work)
454 struct storvsc_scan_work *wrk;
455 struct scsi_device *sdev;
457 wrk = container_of(work, struct storvsc_scan_work, work);
458 if (!scsi_host_get(wrk->host))
461 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
464 scsi_remove_device(sdev);
465 scsi_device_put(sdev);
467 scsi_host_put(wrk->host);
474 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
475 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
478 static inline u16 storvsc_get_version(u8 major, u8 minor)
482 version = ((major << 8) | minor);
487 * We can get incoming messages from the host that are not in response to
488 * messages that we have sent out. An example of this would be messages
489 * received by the guest to notify dynamic addition/removal of LUNs. To
490 * deal with potential race conditions where the driver may be in the
491 * midst of being unloaded when we might receive an unsolicited message
492 * from the host, we have implemented a mechanism to gurantee sequential
495 * 1) Once the device is marked as being destroyed, we will fail all
497 * 2) We permit incoming messages when the device is being destroyed,
498 * only to properly account for messages already sent out.
501 static inline struct storvsc_device *get_out_stor_device(
502 struct hv_device *device)
504 struct storvsc_device *stor_device;
506 stor_device = hv_get_drvdata(device);
508 if (stor_device && stor_device->destroy)
515 static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
517 dev->drain_notify = true;
518 wait_event(dev->waiting_to_drain,
519 atomic_read(&dev->num_outstanding_req) == 0);
520 dev->drain_notify = false;
523 static inline struct storvsc_device *get_in_stor_device(
524 struct hv_device *device)
526 struct storvsc_device *stor_device;
528 stor_device = hv_get_drvdata(device);
534 * If the device is being destroyed; allow incoming
535 * traffic only to cleanup outstanding requests.
538 if (stor_device->destroy &&
539 (atomic_read(&stor_device->num_outstanding_req) == 0))
547 static void destroy_bounce_buffer(struct scatterlist *sgl,
548 unsigned int sg_count)
551 struct page *page_buf;
553 for (i = 0; i < sg_count; i++) {
554 page_buf = sg_page((&sgl[i]));
555 if (page_buf != NULL)
556 __free_page(page_buf);
562 static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
566 /* No need to check */
570 /* We have at least 2 sg entries */
571 for (i = 0; i < sg_count; i++) {
573 /* make sure 1st one does not have hole */
574 if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
576 } else if (i == sg_count - 1) {
577 /* make sure last one does not have hole */
578 if (sgl[i].offset != 0)
581 /* make sure no hole in the middle */
582 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
589 static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
590 unsigned int sg_count,
596 struct scatterlist *bounce_sgl;
597 struct page *page_buf;
598 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
600 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
602 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
606 sg_init_table(bounce_sgl, num_pages);
607 for (i = 0; i < num_pages; i++) {
608 page_buf = alloc_page(GFP_ATOMIC);
611 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
617 destroy_bounce_buffer(bounce_sgl, num_pages);
621 /* Disgusting wrapper functions */
622 static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx)
624 void *addr = kmap_atomic(sg_page(sgl + idx));
625 return (unsigned long)addr;
628 static inline void sg_kunmap_atomic(unsigned long addr)
630 kunmap_atomic((void *)addr);
634 /* Assume the original sgl has enough room */
635 static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
636 struct scatterlist *bounce_sgl,
637 unsigned int orig_sgl_count,
638 unsigned int bounce_sgl_count)
642 unsigned long src, dest;
643 unsigned int srclen, destlen, copylen;
644 unsigned int total_copied = 0;
645 unsigned long bounce_addr = 0;
646 unsigned long dest_addr = 0;
649 local_irq_save(flags);
651 for (i = 0; i < orig_sgl_count; i++) {
652 dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
654 destlen = orig_sgl[i].length;
656 if (bounce_addr == 0)
657 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
660 src = bounce_addr + bounce_sgl[j].offset;
661 srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
663 copylen = min(srclen, destlen);
664 memcpy((void *)dest, (void *)src, copylen);
666 total_copied += copylen;
667 bounce_sgl[j].offset += copylen;
671 if (bounce_sgl[j].offset == bounce_sgl[j].length) {
673 sg_kunmap_atomic(bounce_addr);
677 * It is possible that the number of elements
678 * in the bounce buffer may not be equal to
679 * the number of elements in the original
680 * scatter list. Handle this correctly.
683 if (j == bounce_sgl_count) {
685 * We are done; cleanup and return.
687 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
688 local_irq_restore(flags);
692 /* if we need to use another bounce buffer */
693 if (destlen || i != orig_sgl_count - 1)
694 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
695 } else if (destlen == 0 && i == orig_sgl_count - 1) {
696 /* unmap the last bounce that is < PAGE_SIZE */
697 sg_kunmap_atomic(bounce_addr);
701 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
704 local_irq_restore(flags);
709 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
710 static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
711 struct scatterlist *bounce_sgl,
712 unsigned int orig_sgl_count)
716 unsigned long src, dest;
717 unsigned int srclen, destlen, copylen;
718 unsigned int total_copied = 0;
719 unsigned long bounce_addr = 0;
720 unsigned long src_addr = 0;
723 local_irq_save(flags);
725 for (i = 0; i < orig_sgl_count; i++) {
726 src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
728 srclen = orig_sgl[i].length;
730 if (bounce_addr == 0)
731 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
734 /* assume bounce offset always == 0 */
735 dest = bounce_addr + bounce_sgl[j].length;
736 destlen = PAGE_SIZE - bounce_sgl[j].length;
738 copylen = min(srclen, destlen);
739 memcpy((void *)dest, (void *)src, copylen);
741 total_copied += copylen;
742 bounce_sgl[j].length += copylen;
746 if (bounce_sgl[j].length == PAGE_SIZE) {
747 /* full..move to next entry */
748 sg_kunmap_atomic(bounce_addr);
751 /* if we need to use another bounce buffer */
752 if (srclen || i != orig_sgl_count - 1)
753 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
755 } else if (srclen == 0 && i == orig_sgl_count - 1) {
756 /* unmap the last bounce that is < PAGE_SIZE */
757 sg_kunmap_atomic(bounce_addr);
761 sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
764 local_irq_restore(flags);
769 static void handle_sc_creation(struct vmbus_channel *new_sc)
771 struct hv_device *device = new_sc->primary_channel->device_obj;
772 struct storvsc_device *stor_device;
773 struct vmstorage_channel_properties props;
775 stor_device = get_out_stor_device(device);
779 if (stor_device->open_sub_channel == false)
782 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
785 storvsc_ringbuffer_size,
786 storvsc_ringbuffer_size,
788 sizeof(struct vmstorage_channel_properties),
789 storvsc_on_channel_callback, new_sc);
792 static void handle_multichannel_storage(struct hv_device *device, int max_chns)
794 struct storvsc_device *stor_device;
795 int num_cpus = num_online_cpus();
797 struct storvsc_cmd_request *request;
798 struct vstor_packet *vstor_packet;
801 num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns);
802 stor_device = get_out_stor_device(device);
806 request = &stor_device->init_request;
807 vstor_packet = &request->vstor_packet;
809 stor_device->open_sub_channel = true;
811 * Establish a handler for dealing with subchannels.
813 vmbus_set_sc_create_callback(device->channel, handle_sc_creation);
816 * Check to see if sub-channels have already been created. This
817 * can happen when this driver is re-loaded after unloading.
820 if (vmbus_are_subchannels_present(device->channel))
823 stor_device->open_sub_channel = false;
825 * Request the host to create sub-channels.
827 memset(request, 0, sizeof(struct storvsc_cmd_request));
828 init_completion(&request->wait_event);
829 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS;
830 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
831 vstor_packet->sub_channel_count = num_sc;
833 ret = vmbus_sendpacket(device->channel, vstor_packet,
834 (sizeof(struct vstor_packet) -
836 (unsigned long)request,
838 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
843 t = wait_for_completion_timeout(&request->wait_event, 10*HZ);
847 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
848 vstor_packet->status != 0)
852 * Now that we created the sub-channels, invoke the check; this
853 * may trigger the callback.
855 stor_device->open_sub_channel = true;
856 vmbus_are_subchannels_present(device->channel);
859 static int storvsc_channel_init(struct hv_device *device)
861 struct storvsc_device *stor_device;
862 struct storvsc_cmd_request *request;
863 struct vstor_packet *vstor_packet;
866 bool process_sub_channels = false;
868 stor_device = get_out_stor_device(device);
872 request = &stor_device->init_request;
873 vstor_packet = &request->vstor_packet;
876 * Now, initiate the vsc/vsp initialization protocol on the open
879 memset(request, 0, sizeof(struct storvsc_cmd_request));
880 init_completion(&request->wait_event);
881 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
882 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
884 ret = vmbus_sendpacket(device->channel, vstor_packet,
885 (sizeof(struct vstor_packet) -
887 (unsigned long)request,
889 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
893 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
899 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
900 vstor_packet->status != 0)
904 /* reuse the packet for version range supported */
905 memset(vstor_packet, 0, sizeof(struct vstor_packet));
906 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
907 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
909 vstor_packet->version.major_minor =
910 storvsc_get_version(vmstor_current_major, vmstor_current_minor);
913 * The revision number is only used in Windows; set it to 0.
915 vstor_packet->version.revision = 0;
917 ret = vmbus_sendpacket(device->channel, vstor_packet,
918 (sizeof(struct vstor_packet) -
920 (unsigned long)request,
922 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
926 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
932 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
933 vstor_packet->status != 0)
937 memset(vstor_packet, 0, sizeof(struct vstor_packet));
938 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
939 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
941 ret = vmbus_sendpacket(device->channel, vstor_packet,
942 (sizeof(struct vstor_packet) -
944 (unsigned long)request,
946 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
951 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
957 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
958 vstor_packet->status != 0)
962 * Check to see if multi-channel support is there.
963 * Hosts that implement protocol version of 5.1 and above
964 * support multi-channel.
966 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
967 if ((vmbus_proto_version != VERSION_WIN7) &&
968 (vmbus_proto_version != VERSION_WS2008)) {
969 if (vstor_packet->storage_channel_properties.flags &
970 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
971 process_sub_channels = true;
974 memset(vstor_packet, 0, sizeof(struct vstor_packet));
975 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
976 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
978 ret = vmbus_sendpacket(device->channel, vstor_packet,
979 (sizeof(struct vstor_packet) -
981 (unsigned long)request,
983 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
988 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
994 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
995 vstor_packet->status != 0)
998 if (process_sub_channels)
999 handle_multichannel_storage(device, max_chns);
1006 static void storvsc_handle_error(struct vmscsi_request *vm_srb,
1007 struct scsi_cmnd *scmnd,
1008 struct Scsi_Host *host,
1011 struct storvsc_scan_work *wrk;
1012 void (*process_err_fn)(struct work_struct *work);
1013 bool do_work = false;
1015 switch (vm_srb->srb_status) {
1016 case SRB_STATUS_ERROR:
1018 * If there is an error; offline the device since all
1019 * error recovery strategies would have already been
1020 * deployed on the host side. However, if the command
1021 * were a pass-through command deal with it appropriately.
1023 switch (scmnd->cmnd[0]) {
1026 set_host_byte(scmnd, DID_PASSTHROUGH);
1029 * On Some Windows hosts TEST_UNIT_READY command can return
1030 * SRB_STATUS_ERROR, let the upper level code deal with it
1031 * based on the sense information.
1033 case TEST_UNIT_READY:
1036 set_host_byte(scmnd, DID_TARGET_FAILURE);
1039 case SRB_STATUS_INVALID_LUN:
1041 process_err_fn = storvsc_remove_lun;
1043 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
1044 if ((asc == 0x2a) && (ascq == 0x9)) {
1046 process_err_fn = storvsc_device_scan;
1048 * Retry the I/O that trigerred this.
1050 set_host_byte(scmnd, DID_REQUEUE);
1059 * We need to schedule work to process this error; schedule it.
1061 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1063 set_host_byte(scmnd, DID_TARGET_FAILURE);
1068 wrk->lun = vm_srb->lun;
1069 INIT_WORK(&wrk->work, process_err_fn);
1070 schedule_work(&wrk->work);
1074 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
1076 struct scsi_cmnd *scmnd = cmd_request->cmd;
1077 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1078 struct scsi_sense_hdr sense_hdr;
1079 struct vmscsi_request *vm_srb;
1080 struct Scsi_Host *host;
1081 struct storvsc_device *stor_dev;
1082 struct hv_device *dev = host_dev->dev;
1084 stor_dev = get_in_stor_device(dev);
1085 host = stor_dev->host;
1087 vm_srb = &cmd_request->vstor_packet.vm_srb;
1088 if (cmd_request->bounce_sgl_count) {
1089 if (vm_srb->data_in == READ_TYPE)
1090 copy_from_bounce_buffer(scsi_sglist(scmnd),
1091 cmd_request->bounce_sgl,
1092 scsi_sg_count(scmnd),
1093 cmd_request->bounce_sgl_count);
1094 destroy_bounce_buffer(cmd_request->bounce_sgl,
1095 cmd_request->bounce_sgl_count);
1098 scmnd->result = vm_srb->scsi_status;
1100 if (scmnd->result) {
1101 if (scsi_normalize_sense(scmnd->sense_buffer,
1102 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
1103 scsi_print_sense_hdr(scmnd->device, "storvsc",
1107 if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
1108 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
1111 scsi_set_resid(scmnd,
1112 cmd_request->data_buffer.len -
1113 vm_srb->data_transfer_length);
1115 scmnd->scsi_done(scmnd);
1118 static void storvsc_on_io_completion(struct hv_device *device,
1119 struct vstor_packet *vstor_packet,
1120 struct storvsc_cmd_request *request)
1122 struct storvsc_device *stor_device;
1123 struct vstor_packet *stor_pkt;
1125 stor_device = hv_get_drvdata(device);
1126 stor_pkt = &request->vstor_packet;
1129 * The current SCSI handling on the host side does
1130 * not correctly handle:
1131 * INQUIRY command with page code parameter set to 0x80
1132 * MODE_SENSE command with cmd[2] == 0x1c
1134 * Setup srb and scsi status so this won't be fatal.
1135 * We do this so we can distinguish truly fatal failues
1136 * (srb status == 0x4) and off-line the device in that case.
1139 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
1140 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
1141 vstor_packet->vm_srb.scsi_status = 0;
1142 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
1146 /* Copy over the status...etc */
1147 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
1148 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
1149 stor_pkt->vm_srb.sense_info_length =
1150 vstor_packet->vm_srb.sense_info_length;
1153 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
1154 /* CHECK_CONDITION */
1155 if (vstor_packet->vm_srb.srb_status &
1156 SRB_STATUS_AUTOSENSE_VALID) {
1157 /* autosense data available */
1159 memcpy(request->cmd->sense_buffer,
1160 vstor_packet->vm_srb.sense_data,
1161 vstor_packet->vm_srb.sense_info_length);
1166 stor_pkt->vm_srb.data_transfer_length =
1167 vstor_packet->vm_srb.data_transfer_length;
1169 storvsc_command_completion(request);
1171 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
1172 stor_device->drain_notify)
1173 wake_up(&stor_device->waiting_to_drain);
1178 static void storvsc_on_receive(struct hv_device *device,
1179 struct vstor_packet *vstor_packet,
1180 struct storvsc_cmd_request *request)
1182 struct storvsc_scan_work *work;
1183 struct storvsc_device *stor_device;
1185 switch (vstor_packet->operation) {
1186 case VSTOR_OPERATION_COMPLETE_IO:
1187 storvsc_on_io_completion(device, vstor_packet, request);
1190 case VSTOR_OPERATION_REMOVE_DEVICE:
1191 case VSTOR_OPERATION_ENUMERATE_BUS:
1192 stor_device = get_in_stor_device(device);
1193 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1197 INIT_WORK(&work->work, storvsc_host_scan);
1198 work->host = stor_device->host;
1199 schedule_work(&work->work);
1207 static void storvsc_on_channel_callback(void *context)
1209 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1210 struct hv_device *device;
1211 struct storvsc_device *stor_device;
1214 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
1215 struct storvsc_cmd_request *request;
1218 if (channel->primary_channel != NULL)
1219 device = channel->primary_channel->device_obj;
1221 device = channel->device_obj;
1223 stor_device = get_in_stor_device(device);
1228 ret = vmbus_recvpacket(channel, packet,
1229 ALIGN((sizeof(struct vstor_packet) -
1230 vmscsi_size_delta), 8),
1231 &bytes_recvd, &request_id);
1232 if (ret == 0 && bytes_recvd > 0) {
1234 request = (struct storvsc_cmd_request *)
1235 (unsigned long)request_id;
1237 if ((request == &stor_device->init_request) ||
1238 (request == &stor_device->reset_request)) {
1240 memcpy(&request->vstor_packet, packet,
1241 (sizeof(struct vstor_packet) -
1242 vmscsi_size_delta));
1243 complete(&request->wait_event);
1245 storvsc_on_receive(device,
1246 (struct vstor_packet *)packet,
1257 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
1259 struct vmstorage_channel_properties props;
1262 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
1264 ret = vmbus_open(device->channel,
1268 sizeof(struct vmstorage_channel_properties),
1269 storvsc_on_channel_callback, device->channel);
1274 ret = storvsc_channel_init(device);
1279 static int storvsc_dev_remove(struct hv_device *device)
1281 struct storvsc_device *stor_device;
1282 unsigned long flags;
1284 stor_device = hv_get_drvdata(device);
1286 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1287 stor_device->destroy = true;
1288 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1291 * At this point, all outbound traffic should be disable. We
1292 * only allow inbound traffic (responses) to proceed so that
1293 * outstanding requests can be completed.
1296 storvsc_wait_to_drain(stor_device);
1299 * Since we have already drained, we don't need to busy wait
1300 * as was done in final_release_stor_device()
1301 * Note that we cannot set the ext pointer to NULL until
1302 * we have drained - to drain the outgoing packets, we need to
1303 * allow incoming packets.
1305 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1306 hv_set_drvdata(device, NULL);
1307 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1309 /* Close the channel */
1310 vmbus_close(device->channel);
1316 static int storvsc_do_io(struct hv_device *device,
1317 struct storvsc_cmd_request *request)
1319 struct storvsc_device *stor_device;
1320 struct vstor_packet *vstor_packet;
1321 struct vmbus_channel *outgoing_channel;
1324 vstor_packet = &request->vstor_packet;
1325 stor_device = get_out_stor_device(device);
1331 request->device = device;
1333 * Select an an appropriate channel to send the request out.
1336 outgoing_channel = vmbus_get_outgoing_channel(device->channel);
1339 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
1341 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
1345 vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
1348 vstor_packet->vm_srb.data_transfer_length =
1349 request->data_buffer.len;
1351 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
1353 if (request->data_buffer.len) {
1354 ret = vmbus_sendpacket_multipagebuffer(outgoing_channel,
1355 &request->data_buffer,
1357 (sizeof(struct vstor_packet) -
1359 (unsigned long)request);
1361 ret = vmbus_sendpacket(device->channel, vstor_packet,
1362 (sizeof(struct vstor_packet) -
1364 (unsigned long)request,
1366 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1372 atomic_inc(&stor_device->num_outstanding_req);
1377 static int storvsc_device_configure(struct scsi_device *sdevice)
1379 scsi_change_queue_depth(sdevice, STORVSC_MAX_IO_REQUESTS);
1381 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
1383 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
1385 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
1387 sdevice->no_write_same = 1;
1390 * Add blist flags to permit the reading of the VPD pages even when
1391 * the target may claim SPC-2 compliance. MSFT targets currently
1392 * claim SPC-2 compliance while they implement post SPC-2 features.
1393 * With this patch we can correctly handle WRITE_SAME_16 issues.
1395 sdevice->sdev_bflags |= msft_blist_flags;
1398 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
1399 * if the device is a MSFT virtual device.
1401 if (!strncmp(sdevice->vendor, "Msft", 4)) {
1402 switch (vmbus_proto_version) {
1404 case VERSION_WIN8_1:
1405 sdevice->scsi_level = SCSI_SPC_3;
1413 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1414 sector_t capacity, int *info)
1416 sector_t nsect = capacity;
1417 sector_t cylinders = nsect;
1418 int heads, sectors_pt;
1421 * We are making up these values; let us keep it simple.
1424 sectors_pt = 0x3f; /* Sectors per track */
1425 sector_div(cylinders, heads * sectors_pt);
1426 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1430 info[1] = sectors_pt;
1431 info[2] = (int)cylinders;
1436 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
1438 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1439 struct hv_device *device = host_dev->dev;
1441 struct storvsc_device *stor_device;
1442 struct storvsc_cmd_request *request;
1443 struct vstor_packet *vstor_packet;
1447 stor_device = get_out_stor_device(device);
1451 request = &stor_device->reset_request;
1452 vstor_packet = &request->vstor_packet;
1454 init_completion(&request->wait_event);
1456 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1457 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1458 vstor_packet->vm_srb.path_id = stor_device->path_id;
1460 ret = vmbus_sendpacket(device->channel, vstor_packet,
1461 (sizeof(struct vstor_packet) -
1463 (unsigned long)&stor_device->reset_request,
1465 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1469 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
1471 return TIMEOUT_ERROR;
1475 * At this point, all outstanding requests in the adapter
1476 * should have been flushed out and return to us
1477 * There is a potential race here where the host may be in
1478 * the process of responding when we return from here.
1479 * Just wait for all in-transit packets to be accounted for
1480 * before we return from here.
1482 storvsc_wait_to_drain(stor_device);
1488 * The host guarantees to respond to each command, although I/O latencies might
1489 * be unbounded on Azure. Reset the timer unconditionally to give the host a
1490 * chance to perform EH.
1492 static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
1494 return BLK_EH_RESET_TIMER;
1497 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
1499 bool allowed = true;
1500 u8 scsi_op = scmnd->cmnd[0];
1503 /* the host does not handle WRITE_SAME, log accident usage */
1506 * smartd sends this command and the host does not handle
1507 * this. So, don't send it.
1510 scmnd->result = ILLEGAL_REQUEST << 16;
1519 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
1522 struct hv_host_device *host_dev = shost_priv(host);
1523 struct hv_device *dev = host_dev->dev;
1524 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd);
1526 struct scatterlist *sgl;
1527 unsigned int sg_count = 0;
1528 struct vmscsi_request *vm_srb;
1530 if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
1532 * On legacy hosts filter unimplemented commands.
1533 * Future hosts are expected to correctly handle
1534 * unsupported commands. Furthermore, it is
1535 * possible that some of the currently
1536 * unsupported commands maybe supported in
1537 * future versions of the host.
1539 if (!storvsc_scsi_cmd_ok(scmnd)) {
1540 scmnd->scsi_done(scmnd);
1545 /* Setup the cmd request */
1546 cmd_request->cmd = scmnd;
1548 vm_srb = &cmd_request->vstor_packet.vm_srb;
1549 vm_srb->win8_extension.time_out_value = 60;
1551 vm_srb->win8_extension.srb_flags |=
1552 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1553 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
1556 switch (scmnd->sc_data_direction) {
1558 vm_srb->data_in = WRITE_TYPE;
1559 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
1561 case DMA_FROM_DEVICE:
1562 vm_srb->data_in = READ_TYPE;
1563 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
1566 vm_srb->data_in = UNKNOWN_TYPE;
1567 vm_srb->win8_extension.srb_flags |= (SRB_FLAGS_DATA_IN |
1568 SRB_FLAGS_DATA_OUT);
1573 vm_srb->port_number = host_dev->port;
1574 vm_srb->path_id = scmnd->device->channel;
1575 vm_srb->target_id = scmnd->device->id;
1576 vm_srb->lun = scmnd->device->lun;
1578 vm_srb->cdb_length = scmnd->cmd_len;
1580 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1582 cmd_request->data_buffer.len = scsi_bufflen(scmnd);
1583 if (scsi_sg_count(scmnd)) {
1584 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1585 sg_count = scsi_sg_count(scmnd);
1587 /* check if we need to bounce the sgl */
1588 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
1589 cmd_request->bounce_sgl =
1590 create_bounce_buffer(sgl, scsi_sg_count(scmnd),
1591 scsi_bufflen(scmnd),
1593 if (!cmd_request->bounce_sgl)
1594 return SCSI_MLQUEUE_HOST_BUSY;
1596 cmd_request->bounce_sgl_count =
1597 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
1600 if (vm_srb->data_in == WRITE_TYPE)
1601 copy_to_bounce_buffer(sgl,
1602 cmd_request->bounce_sgl,
1603 scsi_sg_count(scmnd));
1605 sgl = cmd_request->bounce_sgl;
1606 sg_count = cmd_request->bounce_sgl_count;
1609 cmd_request->data_buffer.offset = sgl[0].offset;
1611 for (i = 0; i < sg_count; i++)
1612 cmd_request->data_buffer.pfn_array[i] =
1613 page_to_pfn(sg_page((&sgl[i])));
1615 } else if (scsi_sglist(scmnd)) {
1616 cmd_request->data_buffer.offset =
1617 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
1618 cmd_request->data_buffer.pfn_array[0] =
1619 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1622 /* Invokes the vsc to start an IO */
1623 ret = storvsc_do_io(dev, cmd_request);
1625 if (ret == -EAGAIN) {
1628 if (cmd_request->bounce_sgl_count)
1629 destroy_bounce_buffer(cmd_request->bounce_sgl,
1630 cmd_request->bounce_sgl_count);
1632 return SCSI_MLQUEUE_DEVICE_BUSY;
1638 static struct scsi_host_template scsi_driver = {
1639 .module = THIS_MODULE,
1640 .name = "storvsc_host_t",
1641 .cmd_size = sizeof(struct storvsc_cmd_request),
1642 .bios_param = storvsc_get_chs,
1643 .queuecommand = storvsc_queuecommand,
1644 .eh_host_reset_handler = storvsc_host_reset_handler,
1645 .proc_name = "storvsc_host",
1646 .eh_timed_out = storvsc_eh_timed_out,
1647 .slave_configure = storvsc_device_configure,
1649 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
1651 /* no use setting to 0 since ll_blk_rw reset it to 1 */
1653 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
1654 .use_clustering = DISABLE_CLUSTERING,
1655 /* Make sure we dont get a sg segment crosses a page boundary */
1656 .dma_boundary = PAGE_SIZE-1,
1666 static const struct hv_vmbus_device_id id_table[] = {
1669 .driver_data = SCSI_GUID
1673 .driver_data = IDE_GUID
1675 /* Fibre Channel GUID */
1678 .driver_data = SFC_GUID
1683 MODULE_DEVICE_TABLE(vmbus, id_table);
1685 static int storvsc_probe(struct hv_device *device,
1686 const struct hv_vmbus_device_id *dev_id)
1689 struct Scsi_Host *host;
1690 struct hv_host_device *host_dev;
1691 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
1693 struct storvsc_device *stor_device;
1694 int max_luns_per_target;
1699 * Based on the windows host we are running on,
1700 * set state to properly communicate with the host.
1703 switch (vmbus_proto_version) {
1704 case VERSION_WS2008:
1706 sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
1707 vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
1708 vmstor_current_major = VMSTOR_WIN7_MAJOR;
1709 vmstor_current_minor = VMSTOR_WIN7_MINOR;
1710 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET;
1711 max_targets = STORVSC_IDE_MAX_TARGETS;
1712 max_channels = STORVSC_IDE_MAX_CHANNELS;
1715 sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
1716 vmscsi_size_delta = 0;
1717 vmstor_current_major = VMSTOR_WIN8_MAJOR;
1718 vmstor_current_minor = VMSTOR_WIN8_MINOR;
1719 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET;
1720 max_targets = STORVSC_MAX_TARGETS;
1721 max_channels = STORVSC_MAX_CHANNELS;
1725 if (dev_id->driver_data == SFC_GUID)
1726 scsi_driver.can_queue = (STORVSC_MAX_IO_REQUESTS *
1727 STORVSC_FC_MAX_TARGETS);
1728 host = scsi_host_alloc(&scsi_driver,
1729 sizeof(struct hv_host_device));
1733 host_dev = shost_priv(host);
1734 memset(host_dev, 0, sizeof(struct hv_host_device));
1736 host_dev->port = host->host_no;
1737 host_dev->dev = device;
1740 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
1746 stor_device->destroy = false;
1747 stor_device->open_sub_channel = false;
1748 init_waitqueue_head(&stor_device->waiting_to_drain);
1749 stor_device->device = device;
1750 stor_device->host = host;
1751 hv_set_drvdata(device, stor_device);
1753 stor_device->port_number = host->host_no;
1754 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
1758 host_dev->path = stor_device->path_id;
1759 host_dev->target = stor_device->target_id;
1761 switch (dev_id->driver_data) {
1763 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET;
1764 host->max_id = STORVSC_FC_MAX_TARGETS;
1765 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1;
1769 host->max_lun = max_luns_per_target;
1770 host->max_id = max_targets;
1771 host->max_channel = max_channels - 1;
1775 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET;
1776 host->max_id = STORVSC_IDE_MAX_TARGETS;
1777 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1;
1780 /* max cmd length */
1781 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
1783 /* Register the HBA and start the scsi bus scan */
1784 ret = scsi_add_host(host, &device->device);
1789 scsi_scan_host(host);
1791 target = (device->dev_instance.b[5] << 8 |
1792 device->dev_instance.b[4]);
1793 ret = scsi_add_device(host, 0, target, 0);
1795 scsi_remove_host(host);
1803 * Once we have connected with the host, we would need to
1804 * to invoke storvsc_dev_remove() to rollback this state and
1805 * this call also frees up the stor_device; hence the jump around
1808 storvsc_dev_remove(device);
1815 scsi_host_put(host);
1819 static int storvsc_remove(struct hv_device *dev)
1821 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1822 struct Scsi_Host *host = stor_device->host;
1824 scsi_remove_host(host);
1825 storvsc_dev_remove(dev);
1826 scsi_host_put(host);
1831 static struct hv_driver storvsc_drv = {
1832 .name = KBUILD_MODNAME,
1833 .id_table = id_table,
1834 .probe = storvsc_probe,
1835 .remove = storvsc_remove,
1838 static int __init storvsc_drv_init(void)
1840 u32 max_outstanding_req_per_channel;
1843 * Divide the ring buffer data size (which is 1 page less
1844 * than the ring buffer size since that page is reserved for
1845 * the ring buffer indices) by the max request size (which is
1846 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1848 max_outstanding_req_per_channel =
1849 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1850 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
1851 sizeof(struct vstor_packet) + sizeof(u64) -
1855 if (max_outstanding_req_per_channel <
1856 STORVSC_MAX_IO_REQUESTS)
1859 return vmbus_driver_register(&storvsc_drv);
1862 static void __exit storvsc_drv_exit(void)
1864 vmbus_driver_unregister(&storvsc_drv);
1867 MODULE_LICENSE("GPL");
1868 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
1869 module_init(storvsc_drv_init);
1870 module_exit(storvsc_drv_exit);