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/mempool.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.
313 * We setup a mempool to allocate request structures for this driver
314 * on a per-lun basis. The following define specifies the number of
315 * elements in the pool.
318 #define STORVSC_MIN_BUF_NR 64
319 static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
321 module_param(storvsc_ringbuffer_size, int, S_IRUGO);
322 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
325 * Timeout in seconds for all devices managed by this driver.
327 static int storvsc_timeout = 180;
329 #define STORVSC_MAX_IO_REQUESTS 200
331 static void storvsc_on_channel_callback(void *context);
333 #define STORVSC_MAX_LUNS_PER_TARGET 255
334 #define STORVSC_MAX_TARGETS 2
335 #define STORVSC_MAX_CHANNELS 8
337 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255
338 #define STORVSC_FC_MAX_TARGETS 128
339 #define STORVSC_FC_MAX_CHANNELS 8
341 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
342 #define STORVSC_IDE_MAX_TARGETS 1
343 #define STORVSC_IDE_MAX_CHANNELS 1
345 struct storvsc_cmd_request {
346 struct list_head entry;
347 struct scsi_cmnd *cmd;
349 unsigned int bounce_sgl_count;
350 struct scatterlist *bounce_sgl;
352 struct hv_device *device;
354 /* Synchronize the request/response if needed */
355 struct completion wait_event;
357 unsigned char *sense_buffer;
358 struct hv_multipage_buffer data_buffer;
359 struct vstor_packet vstor_packet;
363 /* A storvsc device is a device object that contains a vmbus channel */
364 struct storvsc_device {
365 struct hv_device *device;
369 bool open_sub_channel;
370 atomic_t num_outstanding_req;
371 struct Scsi_Host *host;
373 wait_queue_head_t waiting_to_drain;
376 * Each unique Port/Path/Target represents 1 channel ie scsi
377 * controller. In reality, the pathid, targetid is always 0
378 * and the port is set by us
380 unsigned int port_number;
381 unsigned char path_id;
382 unsigned char target_id;
384 /* Used for vsc/vsp channel reset process */
385 struct storvsc_cmd_request init_request;
386 struct storvsc_cmd_request reset_request;
389 struct stor_mem_pools {
390 struct kmem_cache *request_pool;
391 mempool_t *request_mempool;
394 struct hv_host_device {
395 struct hv_device *dev;
398 unsigned char target;
401 struct storvsc_scan_work {
402 struct work_struct work;
403 struct Scsi_Host *host;
407 static void storvsc_device_scan(struct work_struct *work)
409 struct storvsc_scan_work *wrk;
411 struct scsi_device *sdev;
413 wrk = container_of(work, struct storvsc_scan_work, work);
416 sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
419 scsi_rescan_device(&sdev->sdev_gendev);
420 scsi_device_put(sdev);
426 static void storvsc_bus_scan(struct work_struct *work)
428 struct storvsc_scan_work *wrk;
431 wrk = container_of(work, struct storvsc_scan_work, work);
432 for (id = 0; id < wrk->host->max_id; ++id) {
433 if (wrk->host->reverse_ordering)
434 order_id = wrk->host->max_id - id - 1;
438 scsi_scan_target(&wrk->host->shost_gendev, 0,
439 order_id, SCAN_WILD_CARD, 1);
444 static void storvsc_remove_lun(struct work_struct *work)
446 struct storvsc_scan_work *wrk;
447 struct scsi_device *sdev;
449 wrk = container_of(work, struct storvsc_scan_work, work);
450 if (!scsi_host_get(wrk->host))
453 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
456 scsi_remove_device(sdev);
457 scsi_device_put(sdev);
459 scsi_host_put(wrk->host);
466 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
467 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
470 static inline u16 storvsc_get_version(u8 major, u8 minor)
474 version = ((major << 8) | minor);
479 * We can get incoming messages from the host that are not in response to
480 * messages that we have sent out. An example of this would be messages
481 * received by the guest to notify dynamic addition/removal of LUNs. To
482 * deal with potential race conditions where the driver may be in the
483 * midst of being unloaded when we might receive an unsolicited message
484 * from the host, we have implemented a mechanism to gurantee sequential
487 * 1) Once the device is marked as being destroyed, we will fail all
489 * 2) We permit incoming messages when the device is being destroyed,
490 * only to properly account for messages already sent out.
493 static inline struct storvsc_device *get_out_stor_device(
494 struct hv_device *device)
496 struct storvsc_device *stor_device;
498 stor_device = hv_get_drvdata(device);
500 if (stor_device && stor_device->destroy)
507 static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
509 dev->drain_notify = true;
510 wait_event(dev->waiting_to_drain,
511 atomic_read(&dev->num_outstanding_req) == 0);
512 dev->drain_notify = false;
515 static inline struct storvsc_device *get_in_stor_device(
516 struct hv_device *device)
518 struct storvsc_device *stor_device;
520 stor_device = hv_get_drvdata(device);
526 * If the device is being destroyed; allow incoming
527 * traffic only to cleanup outstanding requests.
530 if (stor_device->destroy &&
531 (atomic_read(&stor_device->num_outstanding_req) == 0))
539 static void destroy_bounce_buffer(struct scatterlist *sgl,
540 unsigned int sg_count)
543 struct page *page_buf;
545 for (i = 0; i < sg_count; i++) {
546 page_buf = sg_page((&sgl[i]));
547 if (page_buf != NULL)
548 __free_page(page_buf);
554 static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
558 /* No need to check */
562 /* We have at least 2 sg entries */
563 for (i = 0; i < sg_count; i++) {
565 /* make sure 1st one does not have hole */
566 if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
568 } else if (i == sg_count - 1) {
569 /* make sure last one does not have hole */
570 if (sgl[i].offset != 0)
573 /* make sure no hole in the middle */
574 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
581 static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
582 unsigned int sg_count,
588 struct scatterlist *bounce_sgl;
589 struct page *page_buf;
590 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
592 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
594 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
598 sg_init_table(bounce_sgl, num_pages);
599 for (i = 0; i < num_pages; i++) {
600 page_buf = alloc_page(GFP_ATOMIC);
603 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
609 destroy_bounce_buffer(bounce_sgl, num_pages);
613 /* Disgusting wrapper functions */
614 static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx)
616 void *addr = kmap_atomic(sg_page(sgl + idx));
617 return (unsigned long)addr;
620 static inline void sg_kunmap_atomic(unsigned long addr)
622 kunmap_atomic((void *)addr);
626 /* Assume the original sgl has enough room */
627 static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
628 struct scatterlist *bounce_sgl,
629 unsigned int orig_sgl_count,
630 unsigned int bounce_sgl_count)
634 unsigned long src, dest;
635 unsigned int srclen, destlen, copylen;
636 unsigned int total_copied = 0;
637 unsigned long bounce_addr = 0;
638 unsigned long dest_addr = 0;
641 local_irq_save(flags);
643 for (i = 0; i < orig_sgl_count; i++) {
644 dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
646 destlen = orig_sgl[i].length;
648 if (bounce_addr == 0)
649 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
652 src = bounce_addr + bounce_sgl[j].offset;
653 srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
655 copylen = min(srclen, destlen);
656 memcpy((void *)dest, (void *)src, copylen);
658 total_copied += copylen;
659 bounce_sgl[j].offset += copylen;
663 if (bounce_sgl[j].offset == bounce_sgl[j].length) {
665 sg_kunmap_atomic(bounce_addr);
669 * It is possible that the number of elements
670 * in the bounce buffer may not be equal to
671 * the number of elements in the original
672 * scatter list. Handle this correctly.
675 if (j == bounce_sgl_count) {
677 * We are done; cleanup and return.
679 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
680 local_irq_restore(flags);
684 /* if we need to use another bounce buffer */
685 if (destlen || i != orig_sgl_count - 1)
686 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
687 } else if (destlen == 0 && i == orig_sgl_count - 1) {
688 /* unmap the last bounce that is < PAGE_SIZE */
689 sg_kunmap_atomic(bounce_addr);
693 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
696 local_irq_restore(flags);
701 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
702 static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
703 struct scatterlist *bounce_sgl,
704 unsigned int orig_sgl_count)
708 unsigned long src, dest;
709 unsigned int srclen, destlen, copylen;
710 unsigned int total_copied = 0;
711 unsigned long bounce_addr = 0;
712 unsigned long src_addr = 0;
715 local_irq_save(flags);
717 for (i = 0; i < orig_sgl_count; i++) {
718 src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
720 srclen = orig_sgl[i].length;
722 if (bounce_addr == 0)
723 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
726 /* assume bounce offset always == 0 */
727 dest = bounce_addr + bounce_sgl[j].length;
728 destlen = PAGE_SIZE - bounce_sgl[j].length;
730 copylen = min(srclen, destlen);
731 memcpy((void *)dest, (void *)src, copylen);
733 total_copied += copylen;
734 bounce_sgl[j].length += copylen;
738 if (bounce_sgl[j].length == PAGE_SIZE) {
739 /* full..move to next entry */
740 sg_kunmap_atomic(bounce_addr);
743 /* if we need to use another bounce buffer */
744 if (srclen || i != orig_sgl_count - 1)
745 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
747 } else if (srclen == 0 && i == orig_sgl_count - 1) {
748 /* unmap the last bounce that is < PAGE_SIZE */
749 sg_kunmap_atomic(bounce_addr);
753 sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
756 local_irq_restore(flags);
761 static void handle_sc_creation(struct vmbus_channel *new_sc)
763 struct hv_device *device = new_sc->primary_channel->device_obj;
764 struct storvsc_device *stor_device;
765 struct vmstorage_channel_properties props;
767 stor_device = get_out_stor_device(device);
771 if (stor_device->open_sub_channel == false)
774 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
777 storvsc_ringbuffer_size,
778 storvsc_ringbuffer_size,
780 sizeof(struct vmstorage_channel_properties),
781 storvsc_on_channel_callback, new_sc);
784 static void handle_multichannel_storage(struct hv_device *device, int max_chns)
786 struct storvsc_device *stor_device;
787 int num_cpus = num_online_cpus();
789 struct storvsc_cmd_request *request;
790 struct vstor_packet *vstor_packet;
793 num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns);
794 stor_device = get_out_stor_device(device);
798 request = &stor_device->init_request;
799 vstor_packet = &request->vstor_packet;
801 stor_device->open_sub_channel = true;
803 * Establish a handler for dealing with subchannels.
805 vmbus_set_sc_create_callback(device->channel, handle_sc_creation);
808 * Check to see if sub-channels have already been created. This
809 * can happen when this driver is re-loaded after unloading.
812 if (vmbus_are_subchannels_present(device->channel))
815 stor_device->open_sub_channel = false;
817 * Request the host to create sub-channels.
819 memset(request, 0, sizeof(struct storvsc_cmd_request));
820 init_completion(&request->wait_event);
821 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS;
822 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
823 vstor_packet->sub_channel_count = num_sc;
825 ret = vmbus_sendpacket(device->channel, vstor_packet,
826 (sizeof(struct vstor_packet) -
828 (unsigned long)request,
830 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
835 t = wait_for_completion_timeout(&request->wait_event, 10*HZ);
839 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
840 vstor_packet->status != 0)
844 * Now that we created the sub-channels, invoke the check; this
845 * may trigger the callback.
847 stor_device->open_sub_channel = true;
848 vmbus_are_subchannels_present(device->channel);
851 static int storvsc_channel_init(struct hv_device *device)
853 struct storvsc_device *stor_device;
854 struct storvsc_cmd_request *request;
855 struct vstor_packet *vstor_packet;
858 bool process_sub_channels = false;
860 stor_device = get_out_stor_device(device);
864 request = &stor_device->init_request;
865 vstor_packet = &request->vstor_packet;
868 * Now, initiate the vsc/vsp initialization protocol on the open
871 memset(request, 0, sizeof(struct storvsc_cmd_request));
872 init_completion(&request->wait_event);
873 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
874 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
876 ret = vmbus_sendpacket(device->channel, vstor_packet,
877 (sizeof(struct vstor_packet) -
879 (unsigned long)request,
881 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
885 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
891 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
892 vstor_packet->status != 0)
896 /* reuse the packet for version range supported */
897 memset(vstor_packet, 0, sizeof(struct vstor_packet));
898 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
899 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
901 vstor_packet->version.major_minor =
902 storvsc_get_version(vmstor_current_major, vmstor_current_minor);
905 * The revision number is only used in Windows; set it to 0.
907 vstor_packet->version.revision = 0;
909 ret = vmbus_sendpacket(device->channel, vstor_packet,
910 (sizeof(struct vstor_packet) -
912 (unsigned long)request,
914 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
918 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
924 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
925 vstor_packet->status != 0)
929 memset(vstor_packet, 0, sizeof(struct vstor_packet));
930 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
931 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
933 ret = vmbus_sendpacket(device->channel, vstor_packet,
934 (sizeof(struct vstor_packet) -
936 (unsigned long)request,
938 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
943 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
949 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
950 vstor_packet->status != 0)
954 * Check to see if multi-channel support is there.
955 * Hosts that implement protocol version of 5.1 and above
956 * support multi-channel.
958 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
959 if ((vmbus_proto_version != VERSION_WIN7) &&
960 (vmbus_proto_version != VERSION_WS2008)) {
961 if (vstor_packet->storage_channel_properties.flags &
962 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
963 process_sub_channels = true;
966 memset(vstor_packet, 0, sizeof(struct vstor_packet));
967 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
968 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
970 ret = vmbus_sendpacket(device->channel, vstor_packet,
971 (sizeof(struct vstor_packet) -
973 (unsigned long)request,
975 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
980 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
986 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
987 vstor_packet->status != 0)
990 if (process_sub_channels)
991 handle_multichannel_storage(device, max_chns);
998 static void storvsc_handle_error(struct vmscsi_request *vm_srb,
999 struct scsi_cmnd *scmnd,
1000 struct Scsi_Host *host,
1003 struct storvsc_scan_work *wrk;
1004 void (*process_err_fn)(struct work_struct *work);
1005 bool do_work = false;
1007 switch (vm_srb->srb_status) {
1008 case SRB_STATUS_ERROR:
1010 * If there is an error; offline the device since all
1011 * error recovery strategies would have already been
1012 * deployed on the host side. However, if the command
1013 * were a pass-through command deal with it appropriately.
1015 switch (scmnd->cmnd[0]) {
1018 set_host_byte(scmnd, DID_PASSTHROUGH);
1021 set_host_byte(scmnd, DID_TARGET_FAILURE);
1024 case SRB_STATUS_INVALID_LUN:
1026 process_err_fn = storvsc_remove_lun;
1028 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
1029 if ((asc == 0x2a) && (ascq == 0x9)) {
1031 process_err_fn = storvsc_device_scan;
1033 * Retry the I/O that trigerred this.
1035 set_host_byte(scmnd, DID_REQUEUE);
1044 * We need to schedule work to process this error; schedule it.
1046 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1048 set_host_byte(scmnd, DID_TARGET_FAILURE);
1053 wrk->lun = vm_srb->lun;
1054 INIT_WORK(&wrk->work, process_err_fn);
1055 schedule_work(&wrk->work);
1059 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
1061 struct scsi_cmnd *scmnd = cmd_request->cmd;
1062 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1063 void (*scsi_done_fn)(struct scsi_cmnd *);
1064 struct scsi_sense_hdr sense_hdr;
1065 struct vmscsi_request *vm_srb;
1066 struct stor_mem_pools *memp = scmnd->device->hostdata;
1067 struct Scsi_Host *host;
1068 struct storvsc_device *stor_dev;
1069 struct hv_device *dev = host_dev->dev;
1071 stor_dev = get_in_stor_device(dev);
1072 host = stor_dev->host;
1074 vm_srb = &cmd_request->vstor_packet.vm_srb;
1075 if (cmd_request->bounce_sgl_count) {
1076 if (vm_srb->data_in == READ_TYPE)
1077 copy_from_bounce_buffer(scsi_sglist(scmnd),
1078 cmd_request->bounce_sgl,
1079 scsi_sg_count(scmnd),
1080 cmd_request->bounce_sgl_count);
1081 destroy_bounce_buffer(cmd_request->bounce_sgl,
1082 cmd_request->bounce_sgl_count);
1085 scmnd->result = vm_srb->scsi_status;
1087 if (scmnd->result) {
1088 if (scsi_normalize_sense(scmnd->sense_buffer,
1089 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
1090 scsi_print_sense_hdr("storvsc", &sense_hdr);
1093 if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
1094 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
1097 scsi_set_resid(scmnd,
1098 cmd_request->data_buffer.len -
1099 vm_srb->data_transfer_length);
1101 scsi_done_fn = scmnd->scsi_done;
1103 scmnd->host_scribble = NULL;
1104 scmnd->scsi_done = NULL;
1106 scsi_done_fn(scmnd);
1108 mempool_free(cmd_request, memp->request_mempool);
1111 static void storvsc_on_io_completion(struct hv_device *device,
1112 struct vstor_packet *vstor_packet,
1113 struct storvsc_cmd_request *request)
1115 struct storvsc_device *stor_device;
1116 struct vstor_packet *stor_pkt;
1118 stor_device = hv_get_drvdata(device);
1119 stor_pkt = &request->vstor_packet;
1122 * The current SCSI handling on the host side does
1123 * not correctly handle:
1124 * INQUIRY command with page code parameter set to 0x80
1125 * MODE_SENSE command with cmd[2] == 0x1c
1127 * Setup srb and scsi status so this won't be fatal.
1128 * We do this so we can distinguish truly fatal failues
1129 * (srb status == 0x4) and off-line the device in that case.
1132 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
1133 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
1134 vstor_packet->vm_srb.scsi_status = 0;
1135 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
1139 /* Copy over the status...etc */
1140 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
1141 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
1142 stor_pkt->vm_srb.sense_info_length =
1143 vstor_packet->vm_srb.sense_info_length;
1145 if (vstor_packet->vm_srb.scsi_status != 0 ||
1146 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){
1147 dev_warn(&device->device,
1148 "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
1149 stor_pkt->vm_srb.cdb[0],
1150 vstor_packet->vm_srb.scsi_status,
1151 vstor_packet->vm_srb.srb_status);
1154 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
1155 /* CHECK_CONDITION */
1156 if (vstor_packet->vm_srb.srb_status &
1157 SRB_STATUS_AUTOSENSE_VALID) {
1158 /* autosense data available */
1159 dev_warn(&device->device,
1160 "stor pkt %p autosense data valid - len %d\n",
1162 vstor_packet->vm_srb.sense_info_length);
1164 memcpy(request->sense_buffer,
1165 vstor_packet->vm_srb.sense_data,
1166 vstor_packet->vm_srb.sense_info_length);
1171 stor_pkt->vm_srb.data_transfer_length =
1172 vstor_packet->vm_srb.data_transfer_length;
1174 storvsc_command_completion(request);
1176 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
1177 stor_device->drain_notify)
1178 wake_up(&stor_device->waiting_to_drain);
1183 static void storvsc_on_receive(struct hv_device *device,
1184 struct vstor_packet *vstor_packet,
1185 struct storvsc_cmd_request *request)
1187 struct storvsc_scan_work *work;
1188 struct storvsc_device *stor_device;
1190 switch (vstor_packet->operation) {
1191 case VSTOR_OPERATION_COMPLETE_IO:
1192 storvsc_on_io_completion(device, vstor_packet, request);
1195 case VSTOR_OPERATION_REMOVE_DEVICE:
1196 case VSTOR_OPERATION_ENUMERATE_BUS:
1197 stor_device = get_in_stor_device(device);
1198 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1202 INIT_WORK(&work->work, storvsc_bus_scan);
1203 work->host = stor_device->host;
1204 schedule_work(&work->work);
1212 static void storvsc_on_channel_callback(void *context)
1214 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1215 struct hv_device *device;
1216 struct storvsc_device *stor_device;
1219 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
1220 struct storvsc_cmd_request *request;
1223 if (channel->primary_channel != NULL)
1224 device = channel->primary_channel->device_obj;
1226 device = channel->device_obj;
1228 stor_device = get_in_stor_device(device);
1233 ret = vmbus_recvpacket(channel, packet,
1234 ALIGN((sizeof(struct vstor_packet) -
1235 vmscsi_size_delta), 8),
1236 &bytes_recvd, &request_id);
1237 if (ret == 0 && bytes_recvd > 0) {
1239 request = (struct storvsc_cmd_request *)
1240 (unsigned long)request_id;
1242 if ((request == &stor_device->init_request) ||
1243 (request == &stor_device->reset_request)) {
1245 memcpy(&request->vstor_packet, packet,
1246 (sizeof(struct vstor_packet) -
1247 vmscsi_size_delta));
1248 complete(&request->wait_event);
1250 storvsc_on_receive(device,
1251 (struct vstor_packet *)packet,
1262 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
1264 struct vmstorage_channel_properties props;
1267 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
1269 ret = vmbus_open(device->channel,
1273 sizeof(struct vmstorage_channel_properties),
1274 storvsc_on_channel_callback, device->channel);
1279 ret = storvsc_channel_init(device);
1284 static int storvsc_dev_remove(struct hv_device *device)
1286 struct storvsc_device *stor_device;
1287 unsigned long flags;
1289 stor_device = hv_get_drvdata(device);
1291 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1292 stor_device->destroy = true;
1293 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1296 * At this point, all outbound traffic should be disable. We
1297 * only allow inbound traffic (responses) to proceed so that
1298 * outstanding requests can be completed.
1301 storvsc_wait_to_drain(stor_device);
1304 * Since we have already drained, we don't need to busy wait
1305 * as was done in final_release_stor_device()
1306 * Note that we cannot set the ext pointer to NULL until
1307 * we have drained - to drain the outgoing packets, we need to
1308 * allow incoming packets.
1310 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1311 hv_set_drvdata(device, NULL);
1312 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1314 /* Close the channel */
1315 vmbus_close(device->channel);
1321 static int storvsc_do_io(struct hv_device *device,
1322 struct storvsc_cmd_request *request)
1324 struct storvsc_device *stor_device;
1325 struct vstor_packet *vstor_packet;
1326 struct vmbus_channel *outgoing_channel;
1329 vstor_packet = &request->vstor_packet;
1330 stor_device = get_out_stor_device(device);
1336 request->device = device;
1338 * Select an an appropriate channel to send the request out.
1341 outgoing_channel = vmbus_get_outgoing_channel(device->channel);
1344 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
1346 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
1350 vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
1353 vstor_packet->vm_srb.data_transfer_length =
1354 request->data_buffer.len;
1356 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
1358 if (request->data_buffer.len) {
1359 ret = vmbus_sendpacket_multipagebuffer(outgoing_channel,
1360 &request->data_buffer,
1362 (sizeof(struct vstor_packet) -
1364 (unsigned long)request);
1366 ret = vmbus_sendpacket(device->channel, vstor_packet,
1367 (sizeof(struct vstor_packet) -
1369 (unsigned long)request,
1371 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1377 atomic_inc(&stor_device->num_outstanding_req);
1382 static int storvsc_device_alloc(struct scsi_device *sdevice)
1384 struct stor_mem_pools *memp;
1385 int number = STORVSC_MIN_BUF_NR;
1387 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
1391 memp->request_pool =
1392 kmem_cache_create(dev_name(&sdevice->sdev_dev),
1393 sizeof(struct storvsc_cmd_request), 0,
1394 SLAB_HWCACHE_ALIGN, NULL);
1396 if (!memp->request_pool)
1399 memp->request_mempool = mempool_create(number, mempool_alloc_slab,
1401 memp->request_pool);
1403 if (!memp->request_mempool)
1406 sdevice->hostdata = memp;
1411 kmem_cache_destroy(memp->request_pool);
1418 static void storvsc_device_destroy(struct scsi_device *sdevice)
1420 struct stor_mem_pools *memp = sdevice->hostdata;
1425 mempool_destroy(memp->request_mempool);
1426 kmem_cache_destroy(memp->request_pool);
1428 sdevice->hostdata = NULL;
1431 static int storvsc_device_configure(struct scsi_device *sdevice)
1433 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
1434 STORVSC_MAX_IO_REQUESTS);
1436 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
1438 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
1440 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
1442 sdevice->no_write_same = 1;
1447 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1448 sector_t capacity, int *info)
1450 sector_t nsect = capacity;
1451 sector_t cylinders = nsect;
1452 int heads, sectors_pt;
1455 * We are making up these values; let us keep it simple.
1458 sectors_pt = 0x3f; /* Sectors per track */
1459 sector_div(cylinders, heads * sectors_pt);
1460 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1464 info[1] = sectors_pt;
1465 info[2] = (int)cylinders;
1470 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
1472 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1473 struct hv_device *device = host_dev->dev;
1475 struct storvsc_device *stor_device;
1476 struct storvsc_cmd_request *request;
1477 struct vstor_packet *vstor_packet;
1481 stor_device = get_out_stor_device(device);
1485 request = &stor_device->reset_request;
1486 vstor_packet = &request->vstor_packet;
1488 init_completion(&request->wait_event);
1490 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1491 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1492 vstor_packet->vm_srb.path_id = stor_device->path_id;
1494 ret = vmbus_sendpacket(device->channel, vstor_packet,
1495 (sizeof(struct vstor_packet) -
1497 (unsigned long)&stor_device->reset_request,
1499 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1503 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
1505 return TIMEOUT_ERROR;
1509 * At this point, all outstanding requests in the adapter
1510 * should have been flushed out and return to us
1511 * There is a potential race here where the host may be in
1512 * the process of responding when we return from here.
1513 * Just wait for all in-transit packets to be accounted for
1514 * before we return from here.
1516 storvsc_wait_to_drain(stor_device);
1521 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
1523 bool allowed = true;
1524 u8 scsi_op = scmnd->cmnd[0];
1527 /* the host does not handle WRITE_SAME, log accident usage */
1530 * smartd sends this command and the host does not handle
1531 * this. So, don't send it.
1534 scmnd->result = ILLEGAL_REQUEST << 16;
1543 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
1546 struct hv_host_device *host_dev = shost_priv(host);
1547 struct hv_device *dev = host_dev->dev;
1548 struct storvsc_cmd_request *cmd_request;
1549 unsigned int request_size = 0;
1551 struct scatterlist *sgl;
1552 unsigned int sg_count = 0;
1553 struct vmscsi_request *vm_srb;
1554 struct stor_mem_pools *memp = scmnd->device->hostdata;
1556 if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
1558 * On legacy hosts filter unimplemented commands.
1559 * Future hosts are expected to correctly handle
1560 * unsupported commands. Furthermore, it is
1561 * possible that some of the currently
1562 * unsupported commands maybe supported in
1563 * future versions of the host.
1565 if (!storvsc_scsi_cmd_ok(scmnd)) {
1566 scmnd->scsi_done(scmnd);
1571 request_size = sizeof(struct storvsc_cmd_request);
1573 cmd_request = mempool_alloc(memp->request_mempool,
1577 * We might be invoked in an interrupt context; hence
1578 * mempool_alloc() can fail.
1581 return SCSI_MLQUEUE_DEVICE_BUSY;
1583 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
1585 /* Setup the cmd request */
1586 cmd_request->cmd = scmnd;
1588 scmnd->host_scribble = (unsigned char *)cmd_request;
1590 vm_srb = &cmd_request->vstor_packet.vm_srb;
1591 vm_srb->win8_extension.time_out_value = 60;
1595 switch (scmnd->sc_data_direction) {
1597 vm_srb->data_in = WRITE_TYPE;
1598 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
1599 vm_srb->win8_extension.srb_flags |=
1600 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1601 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
1603 case DMA_FROM_DEVICE:
1604 vm_srb->data_in = READ_TYPE;
1605 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
1606 vm_srb->win8_extension.srb_flags |=
1607 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1608 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
1611 vm_srb->data_in = UNKNOWN_TYPE;
1612 vm_srb->win8_extension.srb_flags = 0;
1617 vm_srb->port_number = host_dev->port;
1618 vm_srb->path_id = scmnd->device->channel;
1619 vm_srb->target_id = scmnd->device->id;
1620 vm_srb->lun = scmnd->device->lun;
1622 vm_srb->cdb_length = scmnd->cmd_len;
1624 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1626 cmd_request->sense_buffer = scmnd->sense_buffer;
1629 cmd_request->data_buffer.len = scsi_bufflen(scmnd);
1630 if (scsi_sg_count(scmnd)) {
1631 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1632 sg_count = scsi_sg_count(scmnd);
1634 /* check if we need to bounce the sgl */
1635 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
1636 cmd_request->bounce_sgl =
1637 create_bounce_buffer(sgl, scsi_sg_count(scmnd),
1638 scsi_bufflen(scmnd),
1640 if (!cmd_request->bounce_sgl) {
1641 ret = SCSI_MLQUEUE_HOST_BUSY;
1645 cmd_request->bounce_sgl_count =
1646 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
1649 if (vm_srb->data_in == WRITE_TYPE)
1650 copy_to_bounce_buffer(sgl,
1651 cmd_request->bounce_sgl,
1652 scsi_sg_count(scmnd));
1654 sgl = cmd_request->bounce_sgl;
1655 sg_count = cmd_request->bounce_sgl_count;
1658 cmd_request->data_buffer.offset = sgl[0].offset;
1660 for (i = 0; i < sg_count; i++)
1661 cmd_request->data_buffer.pfn_array[i] =
1662 page_to_pfn(sg_page((&sgl[i])));
1664 } else if (scsi_sglist(scmnd)) {
1665 cmd_request->data_buffer.offset =
1666 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
1667 cmd_request->data_buffer.pfn_array[0] =
1668 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1671 /* Invokes the vsc to start an IO */
1672 ret = storvsc_do_io(dev, cmd_request);
1674 if (ret == -EAGAIN) {
1677 if (cmd_request->bounce_sgl_count) {
1678 destroy_bounce_buffer(cmd_request->bounce_sgl,
1679 cmd_request->bounce_sgl_count);
1681 ret = SCSI_MLQUEUE_DEVICE_BUSY;
1689 mempool_free(cmd_request, memp->request_mempool);
1690 scmnd->host_scribble = NULL;
1694 static struct scsi_host_template scsi_driver = {
1695 .module = THIS_MODULE,
1696 .name = "storvsc_host_t",
1697 .bios_param = storvsc_get_chs,
1698 .queuecommand = storvsc_queuecommand,
1699 .eh_host_reset_handler = storvsc_host_reset_handler,
1700 .slave_alloc = storvsc_device_alloc,
1701 .slave_destroy = storvsc_device_destroy,
1702 .slave_configure = storvsc_device_configure,
1704 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
1706 /* no use setting to 0 since ll_blk_rw reset it to 1 */
1708 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
1709 .use_clustering = DISABLE_CLUSTERING,
1710 /* Make sure we dont get a sg segment crosses a page boundary */
1711 .dma_boundary = PAGE_SIZE-1,
1721 static const struct hv_vmbus_device_id id_table[] = {
1724 .driver_data = SCSI_GUID
1728 .driver_data = IDE_GUID
1730 /* Fibre Channel GUID */
1733 .driver_data = SFC_GUID
1738 MODULE_DEVICE_TABLE(vmbus, id_table);
1740 static int storvsc_probe(struct hv_device *device,
1741 const struct hv_vmbus_device_id *dev_id)
1744 struct Scsi_Host *host;
1745 struct hv_host_device *host_dev;
1746 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
1748 struct storvsc_device *stor_device;
1751 * Based on the windows host we are running on,
1752 * set state to properly communicate with the host.
1755 if (vmbus_proto_version == VERSION_WIN8) {
1756 sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
1757 vmscsi_size_delta = 0;
1758 vmstor_current_major = VMSTOR_WIN8_MAJOR;
1759 vmstor_current_minor = VMSTOR_WIN8_MINOR;
1761 sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
1762 vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
1763 vmstor_current_major = VMSTOR_WIN7_MAJOR;
1764 vmstor_current_minor = VMSTOR_WIN7_MINOR;
1768 if (dev_id->driver_data == SFC_GUID)
1769 scsi_driver.can_queue = (STORVSC_MAX_IO_REQUESTS *
1770 STORVSC_FC_MAX_TARGETS);
1771 host = scsi_host_alloc(&scsi_driver,
1772 sizeof(struct hv_host_device));
1776 host_dev = shost_priv(host);
1777 memset(host_dev, 0, sizeof(struct hv_host_device));
1779 host_dev->port = host->host_no;
1780 host_dev->dev = device;
1783 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
1789 stor_device->destroy = false;
1790 stor_device->open_sub_channel = false;
1791 init_waitqueue_head(&stor_device->waiting_to_drain);
1792 stor_device->device = device;
1793 stor_device->host = host;
1794 hv_set_drvdata(device, stor_device);
1796 stor_device->port_number = host->host_no;
1797 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
1801 host_dev->path = stor_device->path_id;
1802 host_dev->target = stor_device->target_id;
1804 switch (dev_id->driver_data) {
1806 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET;
1807 host->max_id = STORVSC_FC_MAX_TARGETS;
1808 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1;
1812 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
1813 host->max_id = STORVSC_MAX_TARGETS;
1814 host->max_channel = STORVSC_MAX_CHANNELS - 1;
1818 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET;
1819 host->max_id = STORVSC_IDE_MAX_TARGETS;
1820 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1;
1823 /* max cmd length */
1824 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
1826 /* Register the HBA and start the scsi bus scan */
1827 ret = scsi_add_host(host, &device->device);
1832 scsi_scan_host(host);
1834 target = (device->dev_instance.b[5] << 8 |
1835 device->dev_instance.b[4]);
1836 ret = scsi_add_device(host, 0, target, 0);
1838 scsi_remove_host(host);
1846 * Once we have connected with the host, we would need to
1847 * to invoke storvsc_dev_remove() to rollback this state and
1848 * this call also frees up the stor_device; hence the jump around
1851 storvsc_dev_remove(device);
1858 scsi_host_put(host);
1862 static int storvsc_remove(struct hv_device *dev)
1864 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1865 struct Scsi_Host *host = stor_device->host;
1867 scsi_remove_host(host);
1868 storvsc_dev_remove(dev);
1869 scsi_host_put(host);
1874 static struct hv_driver storvsc_drv = {
1875 .name = KBUILD_MODNAME,
1876 .id_table = id_table,
1877 .probe = storvsc_probe,
1878 .remove = storvsc_remove,
1881 static int __init storvsc_drv_init(void)
1883 u32 max_outstanding_req_per_channel;
1886 * Divide the ring buffer data size (which is 1 page less
1887 * than the ring buffer size since that page is reserved for
1888 * the ring buffer indices) by the max request size (which is
1889 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1891 max_outstanding_req_per_channel =
1892 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1893 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
1894 sizeof(struct vstor_packet) + sizeof(u64) -
1898 if (max_outstanding_req_per_channel <
1899 STORVSC_MAX_IO_REQUESTS)
1902 return vmbus_driver_register(&storvsc_drv);
1905 static void __exit storvsc_drv_exit(void)
1907 vmbus_driver_unregister(&storvsc_drv);
1910 MODULE_LICENSE("GPL");
1911 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
1912 module_init(storvsc_drv_init);
1913 module_exit(storvsc_drv_exit);