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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>
28#include <linux/mm.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>
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62#define VMSTOR_WIN7_MAJOR 4
63#define VMSTOR_WIN7_MINOR 2
64
65#define VMSTOR_WIN8_MAJOR 5
66#define VMSTOR_WIN8_MINOR 1
67
68
69
70enum 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
85};
86
87
88
89
90
91struct hv_fc_wwn_packet {
92 bool primary_active;
93 u8 reserved1;
94 u8 reserved2;
95 u8 primary_port_wwn[8];
96 u8 primary_node_wwn[8];
97 u8 secondary_port_wwn[8];
98 u8 secondary_node_wwn[8];
99};
100
101
102
103
104
105
106
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
119
120
121
122
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
134
135
136
137
138
139
140
141#define STORVSC_MAX_CMD_LEN 0x10
142
143#define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
144#define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
145
146#define STORVSC_SENSE_BUFFER_SIZE 0x14
147#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
148
149
150
151
152
153static int sense_buffer_size;
154
155
156
157
158
159
160
161
162
163static int vmscsi_size_delta;
164static int vmstor_current_major;
165static int vmstor_current_minor;
166
167struct vmscsi_win8_extension {
168
169
170
171 u16 reserve;
172 u8 queue_tag;
173 u8 queue_action;
174 u32 srb_flags;
175 u32 time_out_value;
176 u32 queue_sort_ey;
177} __packed;
178
179struct vmscsi_request {
180 u16 length;
181 u8 srb_status;
182 u8 scsi_status;
183
184 u8 port_number;
185 u8 path_id;
186 u8 target_id;
187 u8 lun;
188
189 u8 cdb_length;
190 u8 sense_info_length;
191 u8 data_in;
192 u8 reserved;
193
194 u32 data_transfer_length;
195
196 union {
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];
200 };
201
202
203
204 struct vmscsi_win8_extension win8_extension;
205
206} __attribute((packed));
207
208
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210
211
212
213
214#define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
215
216struct vmstorage_channel_properties {
217 u32 reserved;
218 u16 max_channel_cnt;
219 u16 reserved1;
220
221 u32 flags;
222 u32 max_transfer_bytes;
223
224 u64 reserved2;
225} __packed;
226
227
228struct vmstorage_protocol_version {
229
230 u16 major_minor;
231
232
233
234
235
236
237
238
239 u16 revision;
240} __packed;
241
242
243#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
244#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
245
246struct vstor_packet {
247
248 enum vstor_packet_operation operation;
249
250
251 u32 flags;
252
253
254 u32 status;
255
256
257 union {
258
259
260
261
262 struct vmscsi_request vm_srb;
263
264
265 struct vmstorage_channel_properties storage_channel_properties;
266
267
268 struct vmstorage_protocol_version version;
269
270
271 struct hv_fc_wwn_packet wwn_packet;
272
273
274 u16 sub_channel_count;
275
276
277 u8 buffer[0x34];
278 };
279} __packed;
280
281
282
283
284
285
286
287
288#define REQUEST_COMPLETION_FLAG 0x1
289
290
291enum storvsc_request_type {
292 WRITE_TYPE = 0,
293 READ_TYPE,
294 UNKNOWN_TYPE,
295};
296
297
298
299
300
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
306
307
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313
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315
316
317
318#define STORVSC_MIN_BUF_NR 64
319static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
320
321module_param(storvsc_ringbuffer_size, int, S_IRUGO);
322MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
323
324
325
326
327static int storvsc_timeout = 180;
328
329#define STORVSC_MAX_IO_REQUESTS 200
330
331static void storvsc_on_channel_callback(void *context);
332
333
334
335
336
337
338
339#define STORVSC_MAX_LUNS_PER_TARGET 64
340#define STORVSC_MAX_TARGETS 1
341#define STORVSC_MAX_CHANNELS 1
342
343
344
345struct storvsc_cmd_request {
346 struct list_head entry;
347 struct scsi_cmnd *cmd;
348
349 unsigned int bounce_sgl_count;
350 struct scatterlist *bounce_sgl;
351
352 struct hv_device *device;
353
354
355 struct completion wait_event;
356
357 unsigned char *sense_buffer;
358 struct hv_multipage_buffer data_buffer;
359 struct vstor_packet vstor_packet;
360};
361
362
363
364struct storvsc_device {
365 struct hv_device *device;
366
367 bool destroy;
368 bool drain_notify;
369 bool open_sub_channel;
370 atomic_t num_outstanding_req;
371 struct Scsi_Host *host;
372
373 wait_queue_head_t waiting_to_drain;
374
375
376
377
378
379
380 unsigned int port_number;
381 unsigned char path_id;
382 unsigned char target_id;
383
384
385 struct storvsc_cmd_request init_request;
386 struct storvsc_cmd_request reset_request;
387};
388
389struct stor_mem_pools {
390 struct kmem_cache *request_pool;
391 mempool_t *request_mempool;
392};
393
394struct hv_host_device {
395 struct hv_device *dev;
396 unsigned int port;
397 unsigned char path;
398 unsigned char target;
399};
400
401struct storvsc_scan_work {
402 struct work_struct work;
403 struct Scsi_Host *host;
404 uint lun;
405};
406
407static void storvsc_device_scan(struct work_struct *work)
408{
409 struct storvsc_scan_work *wrk;
410 uint lun;
411 struct scsi_device *sdev;
412
413 wrk = container_of(work, struct storvsc_scan_work, work);
414 lun = wrk->lun;
415
416 sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
417 if (!sdev)
418 goto done;
419 scsi_rescan_device(&sdev->sdev_gendev);
420 scsi_device_put(sdev);
421
422done:
423 kfree(wrk);
424}
425
426static void storvsc_bus_scan(struct work_struct *work)
427{
428 struct storvsc_scan_work *wrk;
429 int id, order_id;
430
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;
435 else
436 order_id = id;
437
438 scsi_scan_target(&wrk->host->shost_gendev, 0,
439 order_id, SCAN_WILD_CARD, 1);
440 }
441 kfree(wrk);
442}
443
444static void storvsc_remove_lun(struct work_struct *work)
445{
446 struct storvsc_scan_work *wrk;
447 struct scsi_device *sdev;
448
449 wrk = container_of(work, struct storvsc_scan_work, work);
450 if (!scsi_host_get(wrk->host))
451 goto done;
452
453 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
454
455 if (sdev) {
456 scsi_remove_device(sdev);
457 scsi_device_put(sdev);
458 }
459 scsi_host_put(wrk->host);
460
461done:
462 kfree(wrk);
463}
464
465
466
467
468
469
470static inline u16 storvsc_get_version(u8 major, u8 minor)
471{
472 u16 version;
473
474 version = ((major << 8) | minor);
475 return version;
476}
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493static inline struct storvsc_device *get_out_stor_device(
494 struct hv_device *device)
495{
496 struct storvsc_device *stor_device;
497
498 stor_device = hv_get_drvdata(device);
499
500 if (stor_device && stor_device->destroy)
501 stor_device = NULL;
502
503 return stor_device;
504}
505
506
507static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
508{
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;
513}
514
515static inline struct storvsc_device *get_in_stor_device(
516 struct hv_device *device)
517{
518 struct storvsc_device *stor_device;
519
520 stor_device = hv_get_drvdata(device);
521
522 if (!stor_device)
523 goto get_in_err;
524
525
526
527
528
529
530 if (stor_device->destroy &&
531 (atomic_read(&stor_device->num_outstanding_req) == 0))
532 stor_device = NULL;
533
534get_in_err:
535 return stor_device;
536
537}
538
539static void destroy_bounce_buffer(struct scatterlist *sgl,
540 unsigned int sg_count)
541{
542 int i;
543 struct page *page_buf;
544
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);
549 }
550
551 kfree(sgl);
552}
553
554static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
555{
556 int i;
557
558
559 if (sg_count < 2)
560 return -1;
561
562
563 for (i = 0; i < sg_count; i++) {
564 if (i == 0) {
565
566 if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
567 return i;
568 } else if (i == sg_count - 1) {
569
570 if (sgl[i].offset != 0)
571 return i;
572 } else {
573
574 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
575 return i;
576 }
577 }
578 return -1;
579}
580
581static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
582 unsigned int sg_count,
583 unsigned int len,
584 int write)
585{
586 int i;
587 int num_pages;
588 struct scatterlist *bounce_sgl;
589 struct page *page_buf;
590 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
591
592 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
593
594 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
595 if (!bounce_sgl)
596 return NULL;
597
598 sg_init_table(bounce_sgl, num_pages);
599 for (i = 0; i < num_pages; i++) {
600 page_buf = alloc_page(GFP_ATOMIC);
601 if (!page_buf)
602 goto cleanup;
603 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
604 }
605
606 return bounce_sgl;
607
608cleanup:
609 destroy_bounce_buffer(bounce_sgl, num_pages);
610 return NULL;
611}
612
613
614static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx)
615{
616 void *addr = kmap_atomic(sg_page(sgl + idx));
617 return (unsigned long)addr;
618}
619
620static inline void sg_kunmap_atomic(unsigned long addr)
621{
622 kunmap_atomic((void *)addr);
623}
624
625
626
627static 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)
631{
632 int i;
633 int j = 0;
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;
639 unsigned long flags;
640
641 local_irq_save(flags);
642
643 for (i = 0; i < orig_sgl_count; i++) {
644 dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
645 dest = dest_addr;
646 destlen = orig_sgl[i].length;
647
648 if (bounce_addr == 0)
649 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
650
651 while (destlen) {
652 src = bounce_addr + bounce_sgl[j].offset;
653 srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
654
655 copylen = min(srclen, destlen);
656 memcpy((void *)dest, (void *)src, copylen);
657
658 total_copied += copylen;
659 bounce_sgl[j].offset += copylen;
660 destlen -= copylen;
661 dest += copylen;
662
663 if (bounce_sgl[j].offset == bounce_sgl[j].length) {
664
665 sg_kunmap_atomic(bounce_addr);
666 j++;
667
668
669
670
671
672
673
674
675 if (j == bounce_sgl_count) {
676
677
678
679 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
680 local_irq_restore(flags);
681 return total_copied;
682 }
683
684
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
689 sg_kunmap_atomic(bounce_addr);
690 }
691 }
692
693 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
694 }
695
696 local_irq_restore(flags);
697
698 return total_copied;
699}
700
701
702static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
703 struct scatterlist *bounce_sgl,
704 unsigned int orig_sgl_count)
705{
706 int i;
707 int j = 0;
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;
713 unsigned long flags;
714
715 local_irq_save(flags);
716
717 for (i = 0; i < orig_sgl_count; i++) {
718 src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
719 src = src_addr;
720 srclen = orig_sgl[i].length;
721
722 if (bounce_addr == 0)
723 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
724
725 while (srclen) {
726
727 dest = bounce_addr + bounce_sgl[j].length;
728 destlen = PAGE_SIZE - bounce_sgl[j].length;
729
730 copylen = min(srclen, destlen);
731 memcpy((void *)dest, (void *)src, copylen);
732
733 total_copied += copylen;
734 bounce_sgl[j].length += copylen;
735 srclen -= copylen;
736 src += copylen;
737
738 if (bounce_sgl[j].length == PAGE_SIZE) {
739
740 sg_kunmap_atomic(bounce_addr);
741 j++;
742
743
744 if (srclen || i != orig_sgl_count - 1)
745 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
746
747 } else if (srclen == 0 && i == orig_sgl_count - 1) {
748
749 sg_kunmap_atomic(bounce_addr);
750 }
751 }
752
753 sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
754 }
755
756 local_irq_restore(flags);
757
758 return total_copied;
759}
760
761static void handle_sc_creation(struct vmbus_channel *new_sc)
762{
763 struct hv_device *device = new_sc->primary_channel->device_obj;
764 struct storvsc_device *stor_device;
765 struct vmstorage_channel_properties props;
766
767 stor_device = get_out_stor_device(device);
768 if (!stor_device)
769 return;
770
771 if (stor_device->open_sub_channel == false)
772 return;
773
774 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
775
776 vmbus_open(new_sc,
777 storvsc_ringbuffer_size,
778 storvsc_ringbuffer_size,
779 (void *)&props,
780 sizeof(struct vmstorage_channel_properties),
781 storvsc_on_channel_callback, new_sc);
782}
783
784static void handle_multichannel_storage(struct hv_device *device, int max_chns)
785{
786 struct storvsc_device *stor_device;
787 int num_cpus = num_online_cpus();
788 int num_sc;
789 struct storvsc_cmd_request *request;
790 struct vstor_packet *vstor_packet;
791 int ret, t;
792
793 num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns);
794 stor_device = get_out_stor_device(device);
795 if (!stor_device)
796 return;
797
798 request = &stor_device->init_request;
799 vstor_packet = &request->vstor_packet;
800
801 stor_device->open_sub_channel = true;
802
803
804
805 vmbus_set_sc_create_callback(device->channel, handle_sc_creation);
806
807
808
809
810
811
812 if (vmbus_are_subchannels_present(device->channel))
813 return;
814
815 stor_device->open_sub_channel = false;
816
817
818
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;
824
825 ret = vmbus_sendpacket(device->channel, vstor_packet,
826 (sizeof(struct vstor_packet) -
827 vmscsi_size_delta),
828 (unsigned long)request,
829 VM_PKT_DATA_INBAND,
830 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
831
832 if (ret != 0)
833 return;
834
835 t = wait_for_completion_timeout(&request->wait_event, 10*HZ);
836 if (t == 0)
837 return;
838
839 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
840 vstor_packet->status != 0)
841 return;
842
843
844
845
846
847 stor_device->open_sub_channel = true;
848 vmbus_are_subchannels_present(device->channel);
849}
850
851static int storvsc_channel_init(struct hv_device *device)
852{
853 struct storvsc_device *stor_device;
854 struct storvsc_cmd_request *request;
855 struct vstor_packet *vstor_packet;
856 int ret, t;
857 int max_chns;
858 bool process_sub_channels = false;
859
860 stor_device = get_out_stor_device(device);
861 if (!stor_device)
862 return -ENODEV;
863
864 request = &stor_device->init_request;
865 vstor_packet = &request->vstor_packet;
866
867
868
869
870
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;
875
876 ret = vmbus_sendpacket(device->channel, vstor_packet,
877 (sizeof(struct vstor_packet) -
878 vmscsi_size_delta),
879 (unsigned long)request,
880 VM_PKT_DATA_INBAND,
881 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
882 if (ret != 0)
883 goto cleanup;
884
885 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
886 if (t == 0) {
887 ret = -ETIMEDOUT;
888 goto cleanup;
889 }
890
891 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
892 vstor_packet->status != 0)
893 goto cleanup;
894
895
896
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;
900
901 vstor_packet->version.major_minor =
902 storvsc_get_version(vmstor_current_major, vmstor_current_minor);
903
904
905
906
907 vstor_packet->version.revision = 0;
908
909 ret = vmbus_sendpacket(device->channel, vstor_packet,
910 (sizeof(struct vstor_packet) -
911 vmscsi_size_delta),
912 (unsigned long)request,
913 VM_PKT_DATA_INBAND,
914 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
915 if (ret != 0)
916 goto cleanup;
917
918 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
919 if (t == 0) {
920 ret = -ETIMEDOUT;
921 goto cleanup;
922 }
923
924 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
925 vstor_packet->status != 0)
926 goto cleanup;
927
928
929 memset(vstor_packet, 0, sizeof(struct vstor_packet));
930 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
931 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
932
933 ret = vmbus_sendpacket(device->channel, vstor_packet,
934 (sizeof(struct vstor_packet) -
935 vmscsi_size_delta),
936 (unsigned long)request,
937 VM_PKT_DATA_INBAND,
938 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
939
940 if (ret != 0)
941 goto cleanup;
942
943 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
944 if (t == 0) {
945 ret = -ETIMEDOUT;
946 goto cleanup;
947 }
948
949 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
950 vstor_packet->status != 0)
951 goto cleanup;
952
953
954
955
956
957
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;
964 }
965
966 memset(vstor_packet, 0, sizeof(struct vstor_packet));
967 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
968 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
969
970 ret = vmbus_sendpacket(device->channel, vstor_packet,
971 (sizeof(struct vstor_packet) -
972 vmscsi_size_delta),
973 (unsigned long)request,
974 VM_PKT_DATA_INBAND,
975 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
976
977 if (ret != 0)
978 goto cleanup;
979
980 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
981 if (t == 0) {
982 ret = -ETIMEDOUT;
983 goto cleanup;
984 }
985
986 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
987 vstor_packet->status != 0)
988 goto cleanup;
989
990 if (process_sub_channels)
991 handle_multichannel_storage(device, max_chns);
992
993
994cleanup:
995 return ret;
996}
997
998static void storvsc_handle_error(struct vmscsi_request *vm_srb,
999 struct scsi_cmnd *scmnd,
1000 struct Scsi_Host *host,
1001 u8 asc, u8 ascq)
1002{
1003 struct storvsc_scan_work *wrk;
1004 void (*process_err_fn)(struct work_struct *work);
1005 bool do_work = false;
1006
1007 switch (vm_srb->srb_status) {
1008 case SRB_STATUS_ERROR:
1009
1010
1011
1012
1013
1014
1015 switch (scmnd->cmnd[0]) {
1016 case ATA_16:
1017 case ATA_12:
1018 set_host_byte(scmnd, DID_PASSTHROUGH);
1019 break;
1020 default:
1021 set_host_byte(scmnd, DID_TARGET_FAILURE);
1022 }
1023 break;
1024 case SRB_STATUS_INVALID_LUN:
1025 do_work = true;
1026 process_err_fn = storvsc_remove_lun;
1027 break;
1028 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
1029 if ((asc == 0x2a) && (ascq == 0x9)) {
1030 do_work = true;
1031 process_err_fn = storvsc_device_scan;
1032
1033
1034
1035 set_host_byte(scmnd, DID_REQUEUE);
1036 }
1037 break;
1038 }
1039
1040 if (!do_work)
1041 return;
1042
1043
1044
1045
1046 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1047 if (!wrk) {
1048 set_host_byte(scmnd, DID_TARGET_FAILURE);
1049 return;
1050 }
1051
1052 wrk->host = host;
1053 wrk->lun = vm_srb->lun;
1054 INIT_WORK(&wrk->work, process_err_fn);
1055 schedule_work(&wrk->work);
1056}
1057
1058
1059static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
1060{
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;
1070
1071 stor_dev = get_in_stor_device(dev);
1072 host = stor_dev->host;
1073
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);
1083 }
1084
1085 scmnd->result = vm_srb->scsi_status;
1086
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);
1091 }
1092
1093 if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
1094 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
1095 sense_hdr.ascq);
1096
1097 scsi_set_resid(scmnd,
1098 cmd_request->data_buffer.len -
1099 vm_srb->data_transfer_length);
1100
1101 scsi_done_fn = scmnd->scsi_done;
1102
1103 scmnd->host_scribble = NULL;
1104 scmnd->scsi_done = NULL;
1105
1106 scsi_done_fn(scmnd);
1107
1108 mempool_free(cmd_request, memp->request_mempool);
1109}
1110
1111static void storvsc_on_io_completion(struct hv_device *device,
1112 struct vstor_packet *vstor_packet,
1113 struct storvsc_cmd_request *request)
1114{
1115 struct storvsc_device *stor_device;
1116 struct vstor_packet *stor_pkt;
1117
1118 stor_device = hv_get_drvdata(device);
1119 stor_pkt = &request->vstor_packet;
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
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;
1136 }
1137
1138
1139
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;
1144
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);
1152 }
1153
1154 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
1155
1156 if (vstor_packet->vm_srb.srb_status &
1157 SRB_STATUS_AUTOSENSE_VALID) {
1158
1159 dev_warn(&device->device,
1160 "stor pkt %p autosense data valid - len %d\n",
1161 request,
1162 vstor_packet->vm_srb.sense_info_length);
1163
1164 memcpy(request->sense_buffer,
1165 vstor_packet->vm_srb.sense_data,
1166 vstor_packet->vm_srb.sense_info_length);
1167
1168 }
1169 }
1170
1171 stor_pkt->vm_srb.data_transfer_length =
1172 vstor_packet->vm_srb.data_transfer_length;
1173
1174 storvsc_command_completion(request);
1175
1176 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
1177 stor_device->drain_notify)
1178 wake_up(&stor_device->waiting_to_drain);
1179
1180
1181}
1182
1183static void storvsc_on_receive(struct hv_device *device,
1184 struct vstor_packet *vstor_packet,
1185 struct storvsc_cmd_request *request)
1186{
1187 struct storvsc_scan_work *work;
1188 struct storvsc_device *stor_device;
1189
1190 switch (vstor_packet->operation) {
1191 case VSTOR_OPERATION_COMPLETE_IO:
1192 storvsc_on_io_completion(device, vstor_packet, request);
1193 break;
1194
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);
1199 if (!work)
1200 return;
1201
1202 INIT_WORK(&work->work, storvsc_bus_scan);
1203 work->host = stor_device->host;
1204 schedule_work(&work->work);
1205 break;
1206
1207 default:
1208 break;
1209 }
1210}
1211
1212static void storvsc_on_channel_callback(void *context)
1213{
1214 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1215 struct hv_device *device;
1216 struct storvsc_device *stor_device;
1217 u32 bytes_recvd;
1218 u64 request_id;
1219 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
1220 struct storvsc_cmd_request *request;
1221 int ret;
1222
1223 if (channel->primary_channel != NULL)
1224 device = channel->primary_channel->device_obj;
1225 else
1226 device = channel->device_obj;
1227
1228 stor_device = get_in_stor_device(device);
1229 if (!stor_device)
1230 return;
1231
1232 do {
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) {
1238
1239 request = (struct storvsc_cmd_request *)
1240 (unsigned long)request_id;
1241
1242 if ((request == &stor_device->init_request) ||
1243 (request == &stor_device->reset_request)) {
1244
1245 memcpy(&request->vstor_packet, packet,
1246 (sizeof(struct vstor_packet) -
1247 vmscsi_size_delta));
1248 complete(&request->wait_event);
1249 } else {
1250 storvsc_on_receive(device,
1251 (struct vstor_packet *)packet,
1252 request);
1253 }
1254 } else {
1255 break;
1256 }
1257 } while (1);
1258
1259 return;
1260}
1261
1262static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
1263{
1264 struct vmstorage_channel_properties props;
1265 int ret;
1266
1267 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
1268
1269 ret = vmbus_open(device->channel,
1270 ring_size,
1271 ring_size,
1272 (void *)&props,
1273 sizeof(struct vmstorage_channel_properties),
1274 storvsc_on_channel_callback, device->channel);
1275
1276 if (ret != 0)
1277 return ret;
1278
1279 ret = storvsc_channel_init(device);
1280
1281 return ret;
1282}
1283
1284static int storvsc_dev_remove(struct hv_device *device)
1285{
1286 struct storvsc_device *stor_device;
1287 unsigned long flags;
1288
1289 stor_device = hv_get_drvdata(device);
1290
1291 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1292 stor_device->destroy = true;
1293 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1294
1295
1296
1297
1298
1299
1300
1301 storvsc_wait_to_drain(stor_device);
1302
1303
1304
1305
1306
1307
1308
1309
1310 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1311 hv_set_drvdata(device, NULL);
1312 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1313
1314
1315 vmbus_close(device->channel);
1316
1317 kfree(stor_device);
1318 return 0;
1319}
1320
1321static int storvsc_do_io(struct hv_device *device,
1322 struct storvsc_cmd_request *request)
1323{
1324 struct storvsc_device *stor_device;
1325 struct vstor_packet *vstor_packet;
1326 struct vmbus_channel *outgoing_channel;
1327 int ret = 0;
1328
1329 vstor_packet = &request->vstor_packet;
1330 stor_device = get_out_stor_device(device);
1331
1332 if (!stor_device)
1333 return -ENODEV;
1334
1335
1336 request->device = device;
1337
1338
1339
1340
1341 outgoing_channel = vmbus_get_outgoing_channel(device->channel);
1342
1343
1344 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
1345
1346 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
1347 vmscsi_size_delta);
1348
1349
1350 vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
1351
1352
1353 vstor_packet->vm_srb.data_transfer_length =
1354 request->data_buffer.len;
1355
1356 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
1357
1358 if (request->data_buffer.len) {
1359 ret = vmbus_sendpacket_multipagebuffer(outgoing_channel,
1360 &request->data_buffer,
1361 vstor_packet,
1362 (sizeof(struct vstor_packet) -
1363 vmscsi_size_delta),
1364 (unsigned long)request);
1365 } else {
1366 ret = vmbus_sendpacket(device->channel, vstor_packet,
1367 (sizeof(struct vstor_packet) -
1368 vmscsi_size_delta),
1369 (unsigned long)request,
1370 VM_PKT_DATA_INBAND,
1371 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1372 }
1373
1374 if (ret != 0)
1375 return ret;
1376
1377 atomic_inc(&stor_device->num_outstanding_req);
1378
1379 return ret;
1380}
1381
1382static int storvsc_device_alloc(struct scsi_device *sdevice)
1383{
1384 struct stor_mem_pools *memp;
1385 int number = STORVSC_MIN_BUF_NR;
1386
1387 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
1388 if (!memp)
1389 return -ENOMEM;
1390
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);
1395
1396 if (!memp->request_pool)
1397 goto err0;
1398
1399 memp->request_mempool = mempool_create(number, mempool_alloc_slab,
1400 mempool_free_slab,
1401 memp->request_pool);
1402
1403 if (!memp->request_mempool)
1404 goto err1;
1405
1406 sdevice->hostdata = memp;
1407
1408 return 0;
1409
1410err1:
1411 kmem_cache_destroy(memp->request_pool);
1412
1413err0:
1414 kfree(memp);
1415 return -ENOMEM;
1416}
1417
1418static void storvsc_device_destroy(struct scsi_device *sdevice)
1419{
1420 struct stor_mem_pools *memp = sdevice->hostdata;
1421
1422 mempool_destroy(memp->request_mempool);
1423 kmem_cache_destroy(memp->request_pool);
1424 kfree(memp);
1425 sdevice->hostdata = NULL;
1426}
1427
1428static int storvsc_device_configure(struct scsi_device *sdevice)
1429{
1430 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
1431 STORVSC_MAX_IO_REQUESTS);
1432
1433 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
1434
1435 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
1436
1437 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
1438
1439 sdevice->no_write_same = 1;
1440
1441 return 0;
1442}
1443
1444static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1445 sector_t capacity, int *info)
1446{
1447 sector_t nsect = capacity;
1448 sector_t cylinders = nsect;
1449 int heads, sectors_pt;
1450
1451
1452
1453
1454 heads = 0xff;
1455 sectors_pt = 0x3f;
1456 sector_div(cylinders, heads * sectors_pt);
1457 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1458 cylinders = 0xffff;
1459
1460 info[0] = heads;
1461 info[1] = sectors_pt;
1462 info[2] = (int)cylinders;
1463
1464 return 0;
1465}
1466
1467static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
1468{
1469 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1470 struct hv_device *device = host_dev->dev;
1471
1472 struct storvsc_device *stor_device;
1473 struct storvsc_cmd_request *request;
1474 struct vstor_packet *vstor_packet;
1475 int ret, t;
1476
1477
1478 stor_device = get_out_stor_device(device);
1479 if (!stor_device)
1480 return FAILED;
1481
1482 request = &stor_device->reset_request;
1483 vstor_packet = &request->vstor_packet;
1484
1485 init_completion(&request->wait_event);
1486
1487 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1488 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1489 vstor_packet->vm_srb.path_id = stor_device->path_id;
1490
1491 ret = vmbus_sendpacket(device->channel, vstor_packet,
1492 (sizeof(struct vstor_packet) -
1493 vmscsi_size_delta),
1494 (unsigned long)&stor_device->reset_request,
1495 VM_PKT_DATA_INBAND,
1496 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1497 if (ret != 0)
1498 return FAILED;
1499
1500 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
1501 if (t == 0)
1502 return TIMEOUT_ERROR;
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513 storvsc_wait_to_drain(stor_device);
1514
1515 return SUCCESS;
1516}
1517
1518static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
1519{
1520 bool allowed = true;
1521 u8 scsi_op = scmnd->cmnd[0];
1522
1523 switch (scsi_op) {
1524
1525 case WRITE_SAME:
1526
1527
1528
1529
1530 case SET_WINDOW:
1531 scmnd->result = ILLEGAL_REQUEST << 16;
1532 allowed = false;
1533 break;
1534 default:
1535 break;
1536 }
1537 return allowed;
1538}
1539
1540static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
1541{
1542 int ret;
1543 struct hv_host_device *host_dev = shost_priv(host);
1544 struct hv_device *dev = host_dev->dev;
1545 struct storvsc_cmd_request *cmd_request;
1546 unsigned int request_size = 0;
1547 int i;
1548 struct scatterlist *sgl;
1549 unsigned int sg_count = 0;
1550 struct vmscsi_request *vm_srb;
1551 struct stor_mem_pools *memp = scmnd->device->hostdata;
1552
1553 if (!storvsc_scsi_cmd_ok(scmnd)) {
1554 scmnd->scsi_done(scmnd);
1555 return 0;
1556 }
1557
1558 request_size = sizeof(struct storvsc_cmd_request);
1559
1560 cmd_request = mempool_alloc(memp->request_mempool,
1561 GFP_ATOMIC);
1562
1563
1564
1565
1566
1567 if (!cmd_request)
1568 return SCSI_MLQUEUE_DEVICE_BUSY;
1569
1570 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
1571
1572
1573 cmd_request->cmd = scmnd;
1574
1575 scmnd->host_scribble = (unsigned char *)cmd_request;
1576
1577 vm_srb = &cmd_request->vstor_packet.vm_srb;
1578 vm_srb->win8_extension.time_out_value = 60;
1579
1580
1581
1582 switch (scmnd->sc_data_direction) {
1583 case DMA_TO_DEVICE:
1584 vm_srb->data_in = WRITE_TYPE;
1585 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
1586 vm_srb->win8_extension.srb_flags |=
1587 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1588 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
1589 break;
1590 case DMA_FROM_DEVICE:
1591 vm_srb->data_in = READ_TYPE;
1592 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
1593 vm_srb->win8_extension.srb_flags |=
1594 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1595 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
1596 break;
1597 default:
1598 vm_srb->data_in = UNKNOWN_TYPE;
1599 vm_srb->win8_extension.srb_flags = 0;
1600 break;
1601 }
1602
1603
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;
1608
1609 vm_srb->cdb_length = scmnd->cmd_len;
1610
1611 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1612
1613 cmd_request->sense_buffer = scmnd->sense_buffer;
1614
1615
1616 cmd_request->data_buffer.len = scsi_bufflen(scmnd);
1617 if (scsi_sg_count(scmnd)) {
1618 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1619 sg_count = scsi_sg_count(scmnd);
1620
1621
1622 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
1623 cmd_request->bounce_sgl =
1624 create_bounce_buffer(sgl, scsi_sg_count(scmnd),
1625 scsi_bufflen(scmnd),
1626 vm_srb->data_in);
1627 if (!cmd_request->bounce_sgl) {
1628 ret = SCSI_MLQUEUE_HOST_BUSY;
1629 goto queue_error;
1630 }
1631
1632 cmd_request->bounce_sgl_count =
1633 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
1634 PAGE_SHIFT;
1635
1636 if (vm_srb->data_in == WRITE_TYPE)
1637 copy_to_bounce_buffer(sgl,
1638 cmd_request->bounce_sgl,
1639 scsi_sg_count(scmnd));
1640
1641 sgl = cmd_request->bounce_sgl;
1642 sg_count = cmd_request->bounce_sgl_count;
1643 }
1644
1645 cmd_request->data_buffer.offset = sgl[0].offset;
1646
1647 for (i = 0; i < sg_count; i++)
1648 cmd_request->data_buffer.pfn_array[i] =
1649 page_to_pfn(sg_page((&sgl[i])));
1650
1651 } else if (scsi_sglist(scmnd)) {
1652 cmd_request->data_buffer.offset =
1653 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
1654 cmd_request->data_buffer.pfn_array[0] =
1655 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1656 }
1657
1658
1659 ret = storvsc_do_io(dev, cmd_request);
1660
1661 if (ret == -EAGAIN) {
1662
1663
1664 if (cmd_request->bounce_sgl_count) {
1665 destroy_bounce_buffer(cmd_request->bounce_sgl,
1666 cmd_request->bounce_sgl_count);
1667
1668 ret = SCSI_MLQUEUE_DEVICE_BUSY;
1669 goto queue_error;
1670 }
1671 }
1672
1673 return 0;
1674
1675queue_error:
1676 mempool_free(cmd_request, memp->request_mempool);
1677 scmnd->host_scribble = NULL;
1678 return ret;
1679}
1680
1681static struct scsi_host_template scsi_driver = {
1682 .module = THIS_MODULE,
1683 .name = "storvsc_host_t",
1684 .bios_param = storvsc_get_chs,
1685 .queuecommand = storvsc_queuecommand,
1686 .eh_host_reset_handler = storvsc_host_reset_handler,
1687 .slave_alloc = storvsc_device_alloc,
1688 .slave_destroy = storvsc_device_destroy,
1689 .slave_configure = storvsc_device_configure,
1690 .cmd_per_lun = 1,
1691
1692 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
1693 .this_id = -1,
1694
1695
1696 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
1697 .use_clustering = DISABLE_CLUSTERING,
1698
1699 .dma_boundary = PAGE_SIZE-1,
1700};
1701
1702enum {
1703 SCSI_GUID,
1704 IDE_GUID,
1705 SFC_GUID,
1706};
1707
1708static const struct hv_vmbus_device_id id_table[] = {
1709
1710 { HV_SCSI_GUID,
1711 .driver_data = SCSI_GUID
1712 },
1713
1714 { HV_IDE_GUID,
1715 .driver_data = IDE_GUID
1716 },
1717
1718 {
1719 HV_SYNTHFC_GUID,
1720 .driver_data = SFC_GUID
1721 },
1722 { },
1723};
1724
1725MODULE_DEVICE_TABLE(vmbus, id_table);
1726
1727static int storvsc_probe(struct hv_device *device,
1728 const struct hv_vmbus_device_id *dev_id)
1729{
1730 int ret;
1731 struct Scsi_Host *host;
1732 struct hv_host_device *host_dev;
1733 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
1734 int target = 0;
1735 struct storvsc_device *stor_device;
1736
1737
1738
1739
1740
1741
1742 if (vmbus_proto_version == VERSION_WIN8) {
1743 sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
1744 vmscsi_size_delta = 0;
1745 vmstor_current_major = VMSTOR_WIN8_MAJOR;
1746 vmstor_current_minor = VMSTOR_WIN8_MINOR;
1747 } else {
1748 sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
1749 vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
1750 vmstor_current_major = VMSTOR_WIN7_MAJOR;
1751 vmstor_current_minor = VMSTOR_WIN7_MINOR;
1752 }
1753
1754
1755 host = scsi_host_alloc(&scsi_driver,
1756 sizeof(struct hv_host_device));
1757 if (!host)
1758 return -ENOMEM;
1759
1760 host_dev = shost_priv(host);
1761 memset(host_dev, 0, sizeof(struct hv_host_device));
1762
1763 host_dev->port = host->host_no;
1764 host_dev->dev = device;
1765
1766
1767 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
1768 if (!stor_device) {
1769 ret = -ENOMEM;
1770 goto err_out0;
1771 }
1772
1773 stor_device->destroy = false;
1774 stor_device->open_sub_channel = false;
1775 init_waitqueue_head(&stor_device->waiting_to_drain);
1776 stor_device->device = device;
1777 stor_device->host = host;
1778 hv_set_drvdata(device, stor_device);
1779
1780 stor_device->port_number = host->host_no;
1781 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
1782 if (ret)
1783 goto err_out1;
1784
1785 host_dev->path = stor_device->path_id;
1786 host_dev->target = stor_device->target_id;
1787
1788
1789 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
1790
1791 host->max_id = STORVSC_MAX_TARGETS;
1792
1793 host->max_channel = STORVSC_MAX_CHANNELS - 1;
1794
1795 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
1796
1797
1798 ret = scsi_add_host(host, &device->device);
1799 if (ret != 0)
1800 goto err_out2;
1801
1802 if (!dev_is_ide) {
1803 scsi_scan_host(host);
1804 } else {
1805 target = (device->dev_instance.b[5] << 8 |
1806 device->dev_instance.b[4]);
1807 ret = scsi_add_device(host, 0, target, 0);
1808 if (ret) {
1809 scsi_remove_host(host);
1810 goto err_out2;
1811 }
1812 }
1813 return 0;
1814
1815err_out2:
1816
1817
1818
1819
1820
1821
1822 storvsc_dev_remove(device);
1823 goto err_out0;
1824
1825err_out1:
1826 kfree(stor_device);
1827
1828err_out0:
1829 scsi_host_put(host);
1830 return ret;
1831}
1832
1833static int storvsc_remove(struct hv_device *dev)
1834{
1835 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1836 struct Scsi_Host *host = stor_device->host;
1837
1838 scsi_remove_host(host);
1839 storvsc_dev_remove(dev);
1840 scsi_host_put(host);
1841
1842 return 0;
1843}
1844
1845static struct hv_driver storvsc_drv = {
1846 .name = KBUILD_MODNAME,
1847 .id_table = id_table,
1848 .probe = storvsc_probe,
1849 .remove = storvsc_remove,
1850};
1851
1852static int __init storvsc_drv_init(void)
1853{
1854 u32 max_outstanding_req_per_channel;
1855
1856
1857
1858
1859
1860
1861
1862 max_outstanding_req_per_channel =
1863 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1864 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
1865 sizeof(struct vstor_packet) + sizeof(u64) -
1866 vmscsi_size_delta,
1867 sizeof(u64)));
1868
1869 if (max_outstanding_req_per_channel <
1870 STORVSC_MAX_IO_REQUESTS)
1871 return -EINVAL;
1872
1873 return vmbus_driver_register(&storvsc_drv);
1874}
1875
1876static void __exit storvsc_drv_exit(void)
1877{
1878 vmbus_driver_unregister(&storvsc_drv);
1879}
1880
1881MODULE_LICENSE("GPL");
1882MODULE_VERSION(HV_DRV_VERSION);
1883MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
1884module_init(storvsc_drv_init);
1885module_exit(storvsc_drv_exit);
1886