1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
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.
7 *
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
11 * more details.
12 *
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.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 * K. Y. Srinivasan <kys@microsoft.com>
21 */
22
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 #define STORVSC_MIN_BUF_NR 64
47 #define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE)
48 static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;
49
50 module_param(storvsc_ringbuffer_size, int, S_IRUGO);
51 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
52
53 /* to alert the user that structure sizes may be mismatched even though the */
54 /* protocol versions match. */
55
56
57 #define REVISION_STRING(REVISION_) #REVISION_
58 #define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \
59 do { \
60 char *revision_string \
61 = REVISION_STRING($Rev : 6 $) + 6; \
62 RESULT_LVALUE_ = 0; \
63 while (*revision_string >= '0' \
64 && *revision_string <= '9') { \
65 RESULT_LVALUE_ *= 10; \
66 RESULT_LVALUE_ += *revision_string - '0'; \
67 revision_string++; \
68 } \
69 } while (0)
70
71 /* Major/minor macros. Minor version is in LSB, meaning that earlier flat */
72 /* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). */
73 #define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff)
74 #define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff)
75 #define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
76 (((MINOR_) & 0xff)))
77 #define VMSTOR_INVALID_PROTOCOL_VERSION (-1)
78
79 /* Version history: */
80 /* V1 Beta 0.1 */
81 /* V1 RC < 2008/1/31 1.0 */
82 /* V1 RC > 2008/1/31 2.0 */
83 #define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(4, 2)
84
85
86
87
88 /* This will get replaced with the max transfer length that is possible on */
89 /* the host adapter. */
90 /* The max transfer length will be published when we offer a vmbus channel. */
91 #define MAX_TRANSFER_LENGTH 0x40000
92 #define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \
93 sizeof(struct vstor_packet) + \
94 sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE)))
95
96
97 /* Packet structure describing virtual storage requests. */
98 enum vstor_packet_operation {
99 VSTOR_OPERATION_COMPLETE_IO = 1,
100 VSTOR_OPERATION_REMOVE_DEVICE = 2,
101 VSTOR_OPERATION_EXECUTE_SRB = 3,
102 VSTOR_OPERATION_RESET_LUN = 4,
103 VSTOR_OPERATION_RESET_ADAPTER = 5,
104 VSTOR_OPERATION_RESET_BUS = 6,
105 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
106 VSTOR_OPERATION_END_INITIALIZATION = 8,
107 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
108 VSTOR_OPERATION_QUERY_PROPERTIES = 10,
109 VSTOR_OPERATION_ENUMERATE_BUS = 11,
110 VSTOR_OPERATION_MAXIMUM = 11
111 };
112
113 /*
114 * Platform neutral description of a scsi request -
115 * this remains the same across the write regardless of 32/64 bit
116 * note: it's patterned off the SCSI_PASS_THROUGH structure
117 */
118 #define CDB16GENERIC_LENGTH 0x10
119
120 #ifndef SENSE_BUFFER_SIZE
121 #define SENSE_BUFFER_SIZE 0x12
122 #endif
123
124 #define MAX_DATA_BUF_LEN_WITH_PADDING 0x14
125
126 struct vmscsi_request {
127 unsigned short length;
128 unsigned char srb_status;
129 unsigned char scsi_status;
130
131 unsigned char port_number;
132 unsigned char path_id;
133 unsigned char target_id;
134 unsigned char lun;
135
136 unsigned char cdb_length;
137 unsigned char sense_info_length;
138 unsigned char data_in;
139 unsigned char reserved;
140
141 unsigned int data_transfer_length;
142
143 union {
144 unsigned char cdb[CDB16GENERIC_LENGTH];
145 unsigned char sense_data[SENSE_BUFFER_SIZE];
146 unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING];
147 };
148 } __attribute((packed));
149
150
151 /*
152 * This structure is sent during the intialization phase to get the different
153 * properties of the channel.
154 */
155 struct vmstorage_channel_properties {
156 unsigned short protocol_version;
157 unsigned char path_id;
158 unsigned char target_id;
159
160 /* Note: port number is only really known on the client side */
161 unsigned int port_number;
162 unsigned int flags;
163 unsigned int max_transfer_bytes;
164
165 /* This id is unique for each channel and will correspond with */
166 /* vendor specific data in the inquirydata */
167 unsigned long long unique_id;
168 } __packed;
169
170 /* This structure is sent during the storage protocol negotiations. */
171 struct vmstorage_protocol_version {
172 /* Major (MSW) and minor (LSW) version numbers. */
173 unsigned short major_minor;
174
175 /*
176 * Revision number is auto-incremented whenever this file is changed
177 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
178 * definitely indicate incompatibility--but it does indicate mismatched
179 * builds.
180 */
181 unsigned short revision;
182 } __packed;
183
184 /* Channel Property Flags */
185 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
186 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
187
188 struct vstor_packet {
189 /* Requested operation type */
190 enum vstor_packet_operation operation;
191
192 /* Flags - see below for values */
193 unsigned int flags;
194
195 /* Status of the request returned from the server side. */
196 unsigned int status;
197
198 /* Data payload area */
199 union {
200 /*
201 * Structure used to forward SCSI commands from the
202 * client to the server.
203 */
204 struct vmscsi_request vm_srb;
205
206 /* Structure used to query channel properties. */
207 struct vmstorage_channel_properties storage_channel_properties;
208
209 /* Used during version negotiations. */
210 struct vmstorage_protocol_version version;
211 };
212 } __packed;
213
214 /* Packet flags */
215 /*
216 * This flag indicates that the server should send back a completion for this
217 * packet.
218 */
219 #define REQUEST_COMPLETION_FLAG 0x1
220
221 /* This is the set of flags that the vsc can set in any packets it sends */
222 #define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG)
223
224
225 /* Defines */
226
227 #define STORVSC_MAX_IO_REQUESTS 128
228
229 /*
230 * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
231 * reality, the path/target is not used (ie always set to 0) so our
232 * scsi host adapter essentially has 1 bus with 1 target that contains
233 * up to 256 luns.
234 */
235 #define STORVSC_MAX_LUNS_PER_TARGET 64
236 #define STORVSC_MAX_TARGETS 1
237 #define STORVSC_MAX_CHANNELS 1
238 #define STORVSC_MAX_CMD_LEN 16
239
240 /* Matches Windows-end */
241 enum storvsc_request_type {
242 WRITE_TYPE,
243 READ_TYPE,
244 UNKNOWN_TYPE,
245 };
246
247
248 struct hv_storvsc_request {
249 struct hv_device *device;
250
251 /* Synchronize the request/response if needed */
252 struct completion wait_event;
253
254 unsigned char *sense_buffer;
255 void *context;
256 void (*on_io_completion)(struct hv_storvsc_request *request);
257 struct hv_multipage_buffer data_buffer;
258
259 struct vstor_packet vstor_packet;
260 };
261
262
263 /* A storvsc device is a device object that contains a vmbus channel */
264 struct storvsc_device {
265 struct hv_device *device;
266
267 bool destroy;
268 bool drain_notify;
269 atomic_t num_outstanding_req;
270 struct Scsi_Host *host;
271
272 wait_queue_head_t waiting_to_drain;
273
274 /*
275 * Each unique Port/Path/Target represents 1 channel ie scsi
276 * controller. In reality, the pathid, targetid is always 0
277 * and the port is set by us
278 */
279 unsigned int port_number;
280 unsigned char path_id;
281 unsigned char target_id;
282
283 /* Used for vsc/vsp channel reset process */
284 struct hv_storvsc_request init_request;
285 struct hv_storvsc_request reset_request;
286 };
287
288 struct stor_mem_pools {
289 struct kmem_cache *request_pool;
290 mempool_t *request_mempool;
291 };
292
293 struct hv_host_device {
294 struct hv_device *dev;
295 unsigned int port;
296 unsigned char path;
297 unsigned char target;
298 };
299
300 struct storvsc_cmd_request {
301 struct list_head entry;
302 struct scsi_cmnd *cmd;
303
304 unsigned int bounce_sgl_count;
305 struct scatterlist *bounce_sgl;
306
307 struct hv_storvsc_request request;
308 };
309
310 struct storvsc_scan_work {
311 struct work_struct work;
312 struct Scsi_Host *host;
313 uint lun;
314 };
315
storvsc_bus_scan(struct work_struct * work)316 static void storvsc_bus_scan(struct work_struct *work)
317 {
318 struct storvsc_scan_work *wrk;
319 int id, order_id;
320
321 wrk = container_of(work, struct storvsc_scan_work, work);
322 for (id = 0; id < wrk->host->max_id; ++id) {
323 if (wrk->host->reverse_ordering)
324 order_id = wrk->host->max_id - id - 1;
325 else
326 order_id = id;
327
328 scsi_scan_target(&wrk->host->shost_gendev, 0,
329 order_id, SCAN_WILD_CARD, 1);
330 }
331 kfree(wrk);
332 }
333
storvsc_remove_lun(struct work_struct * work)334 static void storvsc_remove_lun(struct work_struct *work)
335 {
336 struct storvsc_scan_work *wrk;
337 struct scsi_device *sdev;
338
339 wrk = container_of(work, struct storvsc_scan_work, work);
340 if (!scsi_host_get(wrk->host))
341 goto done;
342
343 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
344
345 if (sdev) {
346 scsi_remove_device(sdev);
347 scsi_device_put(sdev);
348 }
349 scsi_host_put(wrk->host);
350
351 done:
352 kfree(wrk);
353 }
354
get_out_stor_device(struct hv_device * device)355 static inline struct storvsc_device *get_out_stor_device(
356 struct hv_device *device)
357 {
358 struct storvsc_device *stor_device;
359
360 stor_device = hv_get_drvdata(device);
361
362 if (stor_device && stor_device->destroy)
363 stor_device = NULL;
364
365 return stor_device;
366 }
367
368
storvsc_wait_to_drain(struct storvsc_device * dev)369 static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
370 {
371 dev->drain_notify = true;
372 wait_event(dev->waiting_to_drain,
373 atomic_read(&dev->num_outstanding_req) == 0);
374 dev->drain_notify = false;
375 }
376
get_in_stor_device(struct hv_device * device)377 static inline struct storvsc_device *get_in_stor_device(
378 struct hv_device *device)
379 {
380 struct storvsc_device *stor_device;
381
382 stor_device = hv_get_drvdata(device);
383
384 if (!stor_device)
385 goto get_in_err;
386
387 /*
388 * If the device is being destroyed; allow incoming
389 * traffic only to cleanup outstanding requests.
390 */
391
392 if (stor_device->destroy &&
393 (atomic_read(&stor_device->num_outstanding_req) == 0))
394 stor_device = NULL;
395
396 get_in_err:
397 return stor_device;
398
399 }
400
storvsc_channel_init(struct hv_device * device)401 static int storvsc_channel_init(struct hv_device *device)
402 {
403 struct storvsc_device *stor_device;
404 struct hv_storvsc_request *request;
405 struct vstor_packet *vstor_packet;
406 int ret, t;
407
408 stor_device = get_out_stor_device(device);
409 if (!stor_device)
410 return -ENODEV;
411
412 request = &stor_device->init_request;
413 vstor_packet = &request->vstor_packet;
414
415 /*
416 * Now, initiate the vsc/vsp initialization protocol on the open
417 * channel
418 */
419 memset(request, 0, sizeof(struct hv_storvsc_request));
420 init_completion(&request->wait_event);
421 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
422 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
423
424 ret = vmbus_sendpacket(device->channel, vstor_packet,
425 sizeof(struct vstor_packet),
426 (unsigned long)request,
427 VM_PKT_DATA_INBAND,
428 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
429 if (ret != 0)
430 goto cleanup;
431
432 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
433 if (t == 0) {
434 ret = -ETIMEDOUT;
435 goto cleanup;
436 }
437
438 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
439 vstor_packet->status != 0)
440 goto cleanup;
441
442
443 /* reuse the packet for version range supported */
444 memset(vstor_packet, 0, sizeof(struct vstor_packet));
445 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
446 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
447
448 vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT;
449 FILL_VMSTOR_REVISION(vstor_packet->version.revision);
450
451 ret = vmbus_sendpacket(device->channel, vstor_packet,
452 sizeof(struct vstor_packet),
453 (unsigned long)request,
454 VM_PKT_DATA_INBAND,
455 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
456 if (ret != 0)
457 goto cleanup;
458
459 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
460 if (t == 0) {
461 ret = -ETIMEDOUT;
462 goto cleanup;
463 }
464
465 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
466 vstor_packet->status != 0)
467 goto cleanup;
468
469
470 memset(vstor_packet, 0, sizeof(struct vstor_packet));
471 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
472 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
473 vstor_packet->storage_channel_properties.port_number =
474 stor_device->port_number;
475
476 ret = vmbus_sendpacket(device->channel, vstor_packet,
477 sizeof(struct vstor_packet),
478 (unsigned long)request,
479 VM_PKT_DATA_INBAND,
480 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
481
482 if (ret != 0)
483 goto cleanup;
484
485 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
486 if (t == 0) {
487 ret = -ETIMEDOUT;
488 goto cleanup;
489 }
490
491 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
492 vstor_packet->status != 0)
493 goto cleanup;
494
495 stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
496 stor_device->target_id
497 = vstor_packet->storage_channel_properties.target_id;
498
499 memset(vstor_packet, 0, sizeof(struct vstor_packet));
500 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
501 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
502
503 ret = vmbus_sendpacket(device->channel, vstor_packet,
504 sizeof(struct vstor_packet),
505 (unsigned long)request,
506 VM_PKT_DATA_INBAND,
507 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
508
509 if (ret != 0)
510 goto cleanup;
511
512 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
513 if (t == 0) {
514 ret = -ETIMEDOUT;
515 goto cleanup;
516 }
517
518 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
519 vstor_packet->status != 0)
520 goto cleanup;
521
522
523 cleanup:
524 return ret;
525 }
526
storvsc_on_io_completion(struct hv_device * device,struct vstor_packet * vstor_packet,struct hv_storvsc_request * request)527 static void storvsc_on_io_completion(struct hv_device *device,
528 struct vstor_packet *vstor_packet,
529 struct hv_storvsc_request *request)
530 {
531 struct storvsc_device *stor_device;
532 struct vstor_packet *stor_pkt;
533
534 stor_device = hv_get_drvdata(device);
535 stor_pkt = &request->vstor_packet;
536
537 /*
538 * The current SCSI handling on the host side does
539 * not correctly handle:
540 * INQUIRY command with page code parameter set to 0x80
541 * MODE_SENSE command with cmd[2] == 0x1c
542 *
543 * Setup srb and scsi status so this won't be fatal.
544 * We do this so we can distinguish truly fatal failues
545 * (srb status == 0x4) and off-line the device in that case.
546 */
547
548 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
549 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
550 vstor_packet->vm_srb.scsi_status = 0;
551 vstor_packet->vm_srb.srb_status = 0x1;
552 }
553
554
555 /* Copy over the status...etc */
556 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
557 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
558 stor_pkt->vm_srb.sense_info_length =
559 vstor_packet->vm_srb.sense_info_length;
560
561 if (vstor_packet->vm_srb.scsi_status != 0 ||
562 vstor_packet->vm_srb.srb_status != 1){
563 dev_warn(&device->device,
564 "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
565 stor_pkt->vm_srb.cdb[0],
566 vstor_packet->vm_srb.scsi_status,
567 vstor_packet->vm_srb.srb_status);
568 }
569
570 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
571 /* CHECK_CONDITION */
572 if (vstor_packet->vm_srb.srb_status & 0x80) {
573 /* autosense data available */
574 dev_warn(&device->device,
575 "stor pkt %p autosense data valid - len %d\n",
576 request,
577 vstor_packet->vm_srb.sense_info_length);
578
579 memcpy(request->sense_buffer,
580 vstor_packet->vm_srb.sense_data,
581 vstor_packet->vm_srb.sense_info_length);
582
583 }
584 }
585
586 stor_pkt->vm_srb.data_transfer_length =
587 vstor_packet->vm_srb.data_transfer_length;
588
589 request->on_io_completion(request);
590
591 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
592 stor_device->drain_notify)
593 wake_up(&stor_device->waiting_to_drain);
594
595
596 }
597
storvsc_on_receive(struct hv_device * device,struct vstor_packet * vstor_packet,struct hv_storvsc_request * request)598 static void storvsc_on_receive(struct hv_device *device,
599 struct vstor_packet *vstor_packet,
600 struct hv_storvsc_request *request)
601 {
602 struct storvsc_scan_work *work;
603 struct storvsc_device *stor_device;
604
605 switch (vstor_packet->operation) {
606 case VSTOR_OPERATION_COMPLETE_IO:
607 storvsc_on_io_completion(device, vstor_packet, request);
608 break;
609
610 case VSTOR_OPERATION_REMOVE_DEVICE:
611 case VSTOR_OPERATION_ENUMERATE_BUS:
612 stor_device = get_in_stor_device(device);
613 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
614 if (!work)
615 return;
616
617 INIT_WORK(&work->work, storvsc_bus_scan);
618 work->host = stor_device->host;
619 schedule_work(&work->work);
620 break;
621
622 default:
623 break;
624 }
625 }
626
storvsc_on_channel_callback(void * context)627 static void storvsc_on_channel_callback(void *context)
628 {
629 struct hv_device *device = (struct hv_device *)context;
630 struct storvsc_device *stor_device;
631 u32 bytes_recvd;
632 u64 request_id;
633 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
634 struct hv_storvsc_request *request;
635 int ret;
636
637
638 stor_device = get_in_stor_device(device);
639 if (!stor_device)
640 return;
641
642 do {
643 ret = vmbus_recvpacket(device->channel, packet,
644 ALIGN(sizeof(struct vstor_packet), 8),
645 &bytes_recvd, &request_id);
646 if (ret == 0 && bytes_recvd > 0) {
647
648 request = (struct hv_storvsc_request *)
649 (unsigned long)request_id;
650
651 if ((request == &stor_device->init_request) ||
652 (request == &stor_device->reset_request)) {
653
654 memcpy(&request->vstor_packet, packet,
655 sizeof(struct vstor_packet));
656 complete(&request->wait_event);
657 } else {
658 storvsc_on_receive(device,
659 (struct vstor_packet *)packet,
660 request);
661 }
662 } else {
663 break;
664 }
665 } while (1);
666
667 return;
668 }
669
storvsc_connect_to_vsp(struct hv_device * device,u32 ring_size)670 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
671 {
672 struct vmstorage_channel_properties props;
673 int ret;
674
675 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
676
677 /* Open the channel */
678 ret = vmbus_open(device->channel,
679 ring_size,
680 ring_size,
681 (void *)&props,
682 sizeof(struct vmstorage_channel_properties),
683 storvsc_on_channel_callback, device);
684
685 if (ret != 0)
686 return ret;
687
688 ret = storvsc_channel_init(device);
689
690 return ret;
691 }
692
storvsc_dev_remove(struct hv_device * device)693 static int storvsc_dev_remove(struct hv_device *device)
694 {
695 struct storvsc_device *stor_device;
696 unsigned long flags;
697
698 stor_device = hv_get_drvdata(device);
699
700 spin_lock_irqsave(&device->channel->inbound_lock, flags);
701 stor_device->destroy = true;
702 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
703
704 /*
705 * At this point, all outbound traffic should be disable. We
706 * only allow inbound traffic (responses) to proceed so that
707 * outstanding requests can be completed.
708 */
709
710 storvsc_wait_to_drain(stor_device);
711
712 /*
713 * Since we have already drained, we don't need to busy wait
714 * as was done in final_release_stor_device()
715 * Note that we cannot set the ext pointer to NULL until
716 * we have drained - to drain the outgoing packets, we need to
717 * allow incoming packets.
718 */
719 spin_lock_irqsave(&device->channel->inbound_lock, flags);
720 hv_set_drvdata(device, NULL);
721 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
722
723 /* Close the channel */
724 vmbus_close(device->channel);
725
726 kfree(stor_device);
727 return 0;
728 }
729
storvsc_do_io(struct hv_device * device,struct hv_storvsc_request * request)730 static int storvsc_do_io(struct hv_device *device,
731 struct hv_storvsc_request *request)
732 {
733 struct storvsc_device *stor_device;
734 struct vstor_packet *vstor_packet;
735 int ret = 0;
736
737 vstor_packet = &request->vstor_packet;
738 stor_device = get_out_stor_device(device);
739
740 if (!stor_device)
741 return -ENODEV;
742
743
744 request->device = device;
745
746
747 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
748
749 vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
750
751
752 vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE;
753
754
755 vstor_packet->vm_srb.data_transfer_length =
756 request->data_buffer.len;
757
758 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
759
760 if (request->data_buffer.len) {
761 ret = vmbus_sendpacket_multipagebuffer(device->channel,
762 &request->data_buffer,
763 vstor_packet,
764 sizeof(struct vstor_packet),
765 (unsigned long)request);
766 } else {
767 ret = vmbus_sendpacket(device->channel, vstor_packet,
768 sizeof(struct vstor_packet),
769 (unsigned long)request,
770 VM_PKT_DATA_INBAND,
771 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
772 }
773
774 if (ret != 0)
775 return ret;
776
777 atomic_inc(&stor_device->num_outstanding_req);
778
779 return ret;
780 }
781
storvsc_get_ide_info(struct hv_device * dev,int * target,int * path)782 static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path)
783 {
784 *target =
785 dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4];
786
787 *path =
788 dev->dev_instance.b[3] << 24 |
789 dev->dev_instance.b[2] << 16 |
790 dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0];
791 }
792
793
storvsc_device_alloc(struct scsi_device * sdevice)794 static int storvsc_device_alloc(struct scsi_device *sdevice)
795 {
796 struct stor_mem_pools *memp;
797 int number = STORVSC_MIN_BUF_NR;
798
799 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
800 if (!memp)
801 return -ENOMEM;
802
803 memp->request_pool =
804 kmem_cache_create(dev_name(&sdevice->sdev_dev),
805 sizeof(struct storvsc_cmd_request), 0,
806 SLAB_HWCACHE_ALIGN, NULL);
807
808 if (!memp->request_pool)
809 goto err0;
810
811 memp->request_mempool = mempool_create(number, mempool_alloc_slab,
812 mempool_free_slab,
813 memp->request_pool);
814
815 if (!memp->request_mempool)
816 goto err1;
817
818 sdevice->hostdata = memp;
819
820 return 0;
821
822 err1:
823 kmem_cache_destroy(memp->request_pool);
824
825 err0:
826 kfree(memp);
827 return -ENOMEM;
828 }
829
storvsc_device_destroy(struct scsi_device * sdevice)830 static void storvsc_device_destroy(struct scsi_device *sdevice)
831 {
832 struct stor_mem_pools *memp = sdevice->hostdata;
833
834 mempool_destroy(memp->request_mempool);
835 kmem_cache_destroy(memp->request_pool);
836 kfree(memp);
837 sdevice->hostdata = NULL;
838 }
839
storvsc_device_configure(struct scsi_device * sdevice)840 static int storvsc_device_configure(struct scsi_device *sdevice)
841 {
842 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
843 STORVSC_MAX_IO_REQUESTS);
844
845 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
846
847 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
848
849 return 0;
850 }
851
destroy_bounce_buffer(struct scatterlist * sgl,unsigned int sg_count)852 static void destroy_bounce_buffer(struct scatterlist *sgl,
853 unsigned int sg_count)
854 {
855 int i;
856 struct page *page_buf;
857
858 for (i = 0; i < sg_count; i++) {
859 page_buf = sg_page((&sgl[i]));
860 if (page_buf != NULL)
861 __free_page(page_buf);
862 }
863
864 kfree(sgl);
865 }
866
do_bounce_buffer(struct scatterlist * sgl,unsigned int sg_count)867 static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
868 {
869 int i;
870
871 /* No need to check */
872 if (sg_count < 2)
873 return -1;
874
875 /* We have at least 2 sg entries */
876 for (i = 0; i < sg_count; i++) {
877 if (i == 0) {
878 /* make sure 1st one does not have hole */
879 if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
880 return i;
881 } else if (i == sg_count - 1) {
882 /* make sure last one does not have hole */
883 if (sgl[i].offset != 0)
884 return i;
885 } else {
886 /* make sure no hole in the middle */
887 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
888 return i;
889 }
890 }
891 return -1;
892 }
893
create_bounce_buffer(struct scatterlist * sgl,unsigned int sg_count,unsigned int len,int write)894 static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
895 unsigned int sg_count,
896 unsigned int len,
897 int write)
898 {
899 int i;
900 int num_pages;
901 struct scatterlist *bounce_sgl;
902 struct page *page_buf;
903 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
904
905 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
906
907 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
908 if (!bounce_sgl)
909 return NULL;
910
911 for (i = 0; i < num_pages; i++) {
912 page_buf = alloc_page(GFP_ATOMIC);
913 if (!page_buf)
914 goto cleanup;
915 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
916 }
917
918 return bounce_sgl;
919
920 cleanup:
921 destroy_bounce_buffer(bounce_sgl, num_pages);
922 return NULL;
923 }
924
925
926 /* Assume the original sgl has enough room */
copy_from_bounce_buffer(struct scatterlist * orig_sgl,struct scatterlist * bounce_sgl,unsigned int orig_sgl_count,unsigned int bounce_sgl_count)927 static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
928 struct scatterlist *bounce_sgl,
929 unsigned int orig_sgl_count,
930 unsigned int bounce_sgl_count)
931 {
932 int i;
933 int j = 0;
934 unsigned long src, dest;
935 unsigned int srclen, destlen, copylen;
936 unsigned int total_copied = 0;
937 unsigned long bounce_addr = 0;
938 unsigned long dest_addr = 0;
939 unsigned long flags;
940
941 local_irq_save(flags);
942
943 for (i = 0; i < orig_sgl_count; i++) {
944 dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
945 KM_IRQ0) + orig_sgl[i].offset;
946 dest = dest_addr;
947 destlen = orig_sgl[i].length;
948
949 if (bounce_addr == 0)
950 bounce_addr =
951 (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
952 KM_IRQ0);
953
954 while (destlen) {
955 src = bounce_addr + bounce_sgl[j].offset;
956 srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
957
958 copylen = min(srclen, destlen);
959 memcpy((void *)dest, (void *)src, copylen);
960
961 total_copied += copylen;
962 bounce_sgl[j].offset += copylen;
963 destlen -= copylen;
964 dest += copylen;
965
966 if (bounce_sgl[j].offset == bounce_sgl[j].length) {
967 /* full */
968 kunmap_atomic((void *)bounce_addr, KM_IRQ0);
969 j++;
970
971 /*
972 * It is possible that the number of elements
973 * in the bounce buffer may not be equal to
974 * the number of elements in the original
975 * scatter list. Handle this correctly.
976 */
977
978 if (j == bounce_sgl_count) {
979 /*
980 * We are done; cleanup and return.
981 */
982 kunmap_atomic((void *)(dest_addr -
983 orig_sgl[i].offset),
984 KM_IRQ0);
985 local_irq_restore(flags);
986 return total_copied;
987 }
988
989 /* if we need to use another bounce buffer */
990 if (destlen || i != orig_sgl_count - 1)
991 bounce_addr =
992 (unsigned long)kmap_atomic(
993 sg_page((&bounce_sgl[j])), KM_IRQ0);
994 } else if (destlen == 0 && i == orig_sgl_count - 1) {
995 /* unmap the last bounce that is < PAGE_SIZE */
996 kunmap_atomic((void *)bounce_addr, KM_IRQ0);
997 }
998 }
999
1000 kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset),
1001 KM_IRQ0);
1002 }
1003
1004 local_irq_restore(flags);
1005
1006 return total_copied;
1007 }
1008
1009
1010 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
copy_to_bounce_buffer(struct scatterlist * orig_sgl,struct scatterlist * bounce_sgl,unsigned int orig_sgl_count)1011 static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
1012 struct scatterlist *bounce_sgl,
1013 unsigned int orig_sgl_count)
1014 {
1015 int i;
1016 int j = 0;
1017 unsigned long src, dest;
1018 unsigned int srclen, destlen, copylen;
1019 unsigned int total_copied = 0;
1020 unsigned long bounce_addr = 0;
1021 unsigned long src_addr = 0;
1022 unsigned long flags;
1023
1024 local_irq_save(flags);
1025
1026 for (i = 0; i < orig_sgl_count; i++) {
1027 src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
1028 KM_IRQ0) + orig_sgl[i].offset;
1029 src = src_addr;
1030 srclen = orig_sgl[i].length;
1031
1032 if (bounce_addr == 0)
1033 bounce_addr =
1034 (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
1035 KM_IRQ0);
1036
1037 while (srclen) {
1038 /* assume bounce offset always == 0 */
1039 dest = bounce_addr + bounce_sgl[j].length;
1040 destlen = PAGE_SIZE - bounce_sgl[j].length;
1041
1042 copylen = min(srclen, destlen);
1043 memcpy((void *)dest, (void *)src, copylen);
1044
1045 total_copied += copylen;
1046 bounce_sgl[j].length += copylen;
1047 srclen -= copylen;
1048 src += copylen;
1049
1050 if (bounce_sgl[j].length == PAGE_SIZE) {
1051 /* full..move to next entry */
1052 kunmap_atomic((void *)bounce_addr, KM_IRQ0);
1053 j++;
1054
1055 /* if we need to use another bounce buffer */
1056 if (srclen || i != orig_sgl_count - 1)
1057 bounce_addr =
1058 (unsigned long)kmap_atomic(
1059 sg_page((&bounce_sgl[j])), KM_IRQ0);
1060
1061 } else if (srclen == 0 && i == orig_sgl_count - 1) {
1062 /* unmap the last bounce that is < PAGE_SIZE */
1063 kunmap_atomic((void *)bounce_addr, KM_IRQ0);
1064 }
1065 }
1066
1067 kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0);
1068 }
1069
1070 local_irq_restore(flags);
1071
1072 return total_copied;
1073 }
1074
1075
storvsc_remove(struct hv_device * dev)1076 static int storvsc_remove(struct hv_device *dev)
1077 {
1078 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1079 struct Scsi_Host *host = stor_device->host;
1080
1081 scsi_remove_host(host);
1082
1083 scsi_host_put(host);
1084
1085 storvsc_dev_remove(dev);
1086
1087 return 0;
1088 }
1089
1090
storvsc_get_chs(struct scsi_device * sdev,struct block_device * bdev,sector_t capacity,int * info)1091 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1092 sector_t capacity, int *info)
1093 {
1094 sector_t nsect = capacity;
1095 sector_t cylinders = nsect;
1096 int heads, sectors_pt;
1097
1098 /*
1099 * We are making up these values; let us keep it simple.
1100 */
1101 heads = 0xff;
1102 sectors_pt = 0x3f; /* Sectors per track */
1103 sector_div(cylinders, heads * sectors_pt);
1104 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1105 cylinders = 0xffff;
1106
1107 info[0] = heads;
1108 info[1] = sectors_pt;
1109 info[2] = (int)cylinders;
1110
1111 return 0;
1112 }
1113
storvsc_host_reset(struct hv_device * device)1114 static int storvsc_host_reset(struct hv_device *device)
1115 {
1116 struct storvsc_device *stor_device;
1117 struct hv_storvsc_request *request;
1118 struct vstor_packet *vstor_packet;
1119 int ret, t;
1120
1121
1122 stor_device = get_out_stor_device(device);
1123 if (!stor_device)
1124 return FAILED;
1125
1126 request = &stor_device->reset_request;
1127 vstor_packet = &request->vstor_packet;
1128
1129 init_completion(&request->wait_event);
1130
1131 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1132 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1133 vstor_packet->vm_srb.path_id = stor_device->path_id;
1134
1135 ret = vmbus_sendpacket(device->channel, vstor_packet,
1136 sizeof(struct vstor_packet),
1137 (unsigned long)&stor_device->reset_request,
1138 VM_PKT_DATA_INBAND,
1139 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1140 if (ret != 0)
1141 return FAILED;
1142
1143 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
1144 if (t == 0)
1145 return TIMEOUT_ERROR;
1146
1147
1148 /*
1149 * At this point, all outstanding requests in the adapter
1150 * should have been flushed out and return to us
1151 */
1152
1153 return SUCCESS;
1154 }
1155
1156
1157 /*
1158 * storvsc_host_reset_handler - Reset the scsi HBA
1159 */
storvsc_host_reset_handler(struct scsi_cmnd * scmnd)1160 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
1161 {
1162 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1163 struct hv_device *dev = host_dev->dev;
1164
1165 return storvsc_host_reset(dev);
1166 }
1167
1168
1169 /*
1170 * storvsc_command_completion - Command completion processing
1171 */
storvsc_command_completion(struct hv_storvsc_request * request)1172 static void storvsc_command_completion(struct hv_storvsc_request *request)
1173 {
1174 struct storvsc_cmd_request *cmd_request =
1175 (struct storvsc_cmd_request *)request->context;
1176 struct scsi_cmnd *scmnd = cmd_request->cmd;
1177 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1178 void (*scsi_done_fn)(struct scsi_cmnd *);
1179 struct scsi_sense_hdr sense_hdr;
1180 struct vmscsi_request *vm_srb;
1181 struct storvsc_scan_work *wrk;
1182 struct stor_mem_pools *memp = scmnd->device->hostdata;
1183
1184 vm_srb = &request->vstor_packet.vm_srb;
1185 if (cmd_request->bounce_sgl_count) {
1186 if (vm_srb->data_in == READ_TYPE)
1187 copy_from_bounce_buffer(scsi_sglist(scmnd),
1188 cmd_request->bounce_sgl,
1189 scsi_sg_count(scmnd),
1190 cmd_request->bounce_sgl_count);
1191 destroy_bounce_buffer(cmd_request->bounce_sgl,
1192 cmd_request->bounce_sgl_count);
1193 }
1194
1195 /*
1196 * If there is an error; offline the device since all
1197 * error recovery strategies would have already been
1198 * deployed on the host side.
1199 */
1200 if (vm_srb->srb_status == 0x4)
1201 scmnd->result = DID_TARGET_FAILURE << 16;
1202 else
1203 scmnd->result = vm_srb->scsi_status;
1204
1205 /*
1206 * If the LUN is invalid; remove the device.
1207 */
1208 if (vm_srb->srb_status == 0x20) {
1209 struct storvsc_device *stor_dev;
1210 struct hv_device *dev = host_dev->dev;
1211 struct Scsi_Host *host;
1212
1213 stor_dev = get_in_stor_device(dev);
1214 host = stor_dev->host;
1215
1216 wrk = kmalloc(sizeof(struct storvsc_scan_work),
1217 GFP_ATOMIC);
1218 if (!wrk) {
1219 scmnd->result = DID_TARGET_FAILURE << 16;
1220 } else {
1221 wrk->host = host;
1222 wrk->lun = vm_srb->lun;
1223 INIT_WORK(&wrk->work, storvsc_remove_lun);
1224 schedule_work(&wrk->work);
1225 }
1226 }
1227
1228 if (scmnd->result) {
1229 if (scsi_normalize_sense(scmnd->sense_buffer,
1230 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
1231 scsi_print_sense_hdr("storvsc", &sense_hdr);
1232 }
1233
1234 scsi_set_resid(scmnd,
1235 request->data_buffer.len -
1236 vm_srb->data_transfer_length);
1237
1238 scsi_done_fn = scmnd->scsi_done;
1239
1240 scmnd->host_scribble = NULL;
1241 scmnd->scsi_done = NULL;
1242
1243 scsi_done_fn(scmnd);
1244
1245 mempool_free(cmd_request, memp->request_mempool);
1246 }
1247
storvsc_check_scsi_cmd(struct scsi_cmnd * scmnd)1248 static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd)
1249 {
1250 bool allowed = true;
1251 u8 scsi_op = scmnd->cmnd[0];
1252
1253 switch (scsi_op) {
1254 /* smartd sends this command, which will offline the device */
1255 case SET_WINDOW:
1256 scmnd->result = ILLEGAL_REQUEST << 16;
1257 allowed = false;
1258 break;
1259 default:
1260 break;
1261 }
1262 return allowed;
1263 }
1264
1265 /*
1266 * storvsc_queuecommand - Initiate command processing
1267 */
storvsc_queuecommand(struct Scsi_Host * host,struct scsi_cmnd * scmnd)1268 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
1269 {
1270 int ret;
1271 struct hv_host_device *host_dev = shost_priv(host);
1272 struct hv_device *dev = host_dev->dev;
1273 struct hv_storvsc_request *request;
1274 struct storvsc_cmd_request *cmd_request;
1275 unsigned int request_size = 0;
1276 int i;
1277 struct scatterlist *sgl;
1278 unsigned int sg_count = 0;
1279 struct vmscsi_request *vm_srb;
1280 struct stor_mem_pools *memp = scmnd->device->hostdata;
1281
1282 if (storvsc_check_scsi_cmd(scmnd) == false) {
1283 scmnd->scsi_done(scmnd);
1284 return 0;
1285 }
1286
1287 /* If retrying, no need to prep the cmd */
1288 if (scmnd->host_scribble) {
1289
1290 cmd_request =
1291 (struct storvsc_cmd_request *)scmnd->host_scribble;
1292
1293 goto retry_request;
1294 }
1295
1296 request_size = sizeof(struct storvsc_cmd_request);
1297
1298 cmd_request = mempool_alloc(memp->request_mempool,
1299 GFP_ATOMIC);
1300 if (!cmd_request)
1301 return SCSI_MLQUEUE_DEVICE_BUSY;
1302
1303 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
1304
1305 /* Setup the cmd request */
1306 cmd_request->bounce_sgl_count = 0;
1307 cmd_request->bounce_sgl = NULL;
1308 cmd_request->cmd = scmnd;
1309
1310 scmnd->host_scribble = (unsigned char *)cmd_request;
1311
1312 request = &cmd_request->request;
1313 vm_srb = &request->vstor_packet.vm_srb;
1314
1315
1316 /* Build the SRB */
1317 switch (scmnd->sc_data_direction) {
1318 case DMA_TO_DEVICE:
1319 vm_srb->data_in = WRITE_TYPE;
1320 break;
1321 case DMA_FROM_DEVICE:
1322 vm_srb->data_in = READ_TYPE;
1323 break;
1324 default:
1325 vm_srb->data_in = UNKNOWN_TYPE;
1326 break;
1327 }
1328
1329 request->on_io_completion = storvsc_command_completion;
1330 request->context = cmd_request;/* scmnd; */
1331
1332 vm_srb->port_number = host_dev->port;
1333 vm_srb->path_id = scmnd->device->channel;
1334 vm_srb->target_id = scmnd->device->id;
1335 vm_srb->lun = scmnd->device->lun;
1336
1337 vm_srb->cdb_length = scmnd->cmd_len;
1338
1339 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1340
1341 request->sense_buffer = scmnd->sense_buffer;
1342
1343
1344 request->data_buffer.len = scsi_bufflen(scmnd);
1345 if (scsi_sg_count(scmnd)) {
1346 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1347 sg_count = scsi_sg_count(scmnd);
1348
1349 /* check if we need to bounce the sgl */
1350 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
1351 cmd_request->bounce_sgl =
1352 create_bounce_buffer(sgl, scsi_sg_count(scmnd),
1353 scsi_bufflen(scmnd),
1354 vm_srb->data_in);
1355 if (!cmd_request->bounce_sgl) {
1356 scmnd->host_scribble = NULL;
1357 mempool_free(cmd_request,
1358 memp->request_mempool);
1359
1360 return SCSI_MLQUEUE_HOST_BUSY;
1361 }
1362
1363 cmd_request->bounce_sgl_count =
1364 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
1365 PAGE_SHIFT;
1366
1367 if (vm_srb->data_in == WRITE_TYPE)
1368 copy_to_bounce_buffer(sgl,
1369 cmd_request->bounce_sgl,
1370 scsi_sg_count(scmnd));
1371
1372 sgl = cmd_request->bounce_sgl;
1373 sg_count = cmd_request->bounce_sgl_count;
1374 }
1375
1376 request->data_buffer.offset = sgl[0].offset;
1377
1378 for (i = 0; i < sg_count; i++)
1379 request->data_buffer.pfn_array[i] =
1380 page_to_pfn(sg_page((&sgl[i])));
1381
1382 } else if (scsi_sglist(scmnd)) {
1383 request->data_buffer.offset =
1384 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
1385 request->data_buffer.pfn_array[0] =
1386 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1387 }
1388
1389 retry_request:
1390 /* Invokes the vsc to start an IO */
1391 ret = storvsc_do_io(dev, &cmd_request->request);
1392
1393 if (ret == -EAGAIN) {
1394 /* no more space */
1395
1396 if (cmd_request->bounce_sgl_count)
1397 destroy_bounce_buffer(cmd_request->bounce_sgl,
1398 cmd_request->bounce_sgl_count);
1399
1400 mempool_free(cmd_request, memp->request_mempool);
1401
1402 scmnd->host_scribble = NULL;
1403
1404 ret = SCSI_MLQUEUE_DEVICE_BUSY;
1405 }
1406
1407 return ret;
1408 }
1409
1410 /* Scsi driver */
1411 static struct scsi_host_template scsi_driver = {
1412 .module = THIS_MODULE,
1413 .name = "storvsc_host_t",
1414 .bios_param = storvsc_get_chs,
1415 .queuecommand = storvsc_queuecommand,
1416 .eh_host_reset_handler = storvsc_host_reset_handler,
1417 .slave_alloc = storvsc_device_alloc,
1418 .slave_destroy = storvsc_device_destroy,
1419 .slave_configure = storvsc_device_configure,
1420 .cmd_per_lun = 1,
1421 /* 64 max_queue * 1 target */
1422 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
1423 .this_id = -1,
1424 /* no use setting to 0 since ll_blk_rw reset it to 1 */
1425 /* currently 32 */
1426 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
1427 .use_clustering = DISABLE_CLUSTERING,
1428 /* Make sure we dont get a sg segment crosses a page boundary */
1429 .dma_boundary = PAGE_SIZE-1,
1430 };
1431
1432 enum {
1433 SCSI_GUID,
1434 IDE_GUID,
1435 };
1436
1437 static const struct hv_vmbus_device_id id_table[] = {
1438 /* SCSI guid */
1439 { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
1440 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
1441 .driver_data = SCSI_GUID },
1442 /* IDE guid */
1443 { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
1444 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
1445 .driver_data = IDE_GUID },
1446 { },
1447 };
1448
1449 MODULE_DEVICE_TABLE(vmbus, id_table);
1450
1451
1452 /*
1453 * storvsc_probe - Add a new device for this driver
1454 */
1455
storvsc_probe(struct hv_device * device,const struct hv_vmbus_device_id * dev_id)1456 static int storvsc_probe(struct hv_device *device,
1457 const struct hv_vmbus_device_id *dev_id)
1458 {
1459 int ret;
1460 struct Scsi_Host *host;
1461 struct hv_host_device *host_dev;
1462 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
1463 int path = 0;
1464 int target = 0;
1465 struct storvsc_device *stor_device;
1466
1467 host = scsi_host_alloc(&scsi_driver,
1468 sizeof(struct hv_host_device));
1469 if (!host)
1470 return -ENOMEM;
1471
1472 host_dev = shost_priv(host);
1473 memset(host_dev, 0, sizeof(struct hv_host_device));
1474
1475 host_dev->port = host->host_no;
1476 host_dev->dev = device;
1477
1478
1479 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
1480 if (!stor_device) {
1481 ret = -ENOMEM;
1482 goto err_out0;
1483 }
1484
1485 stor_device->destroy = false;
1486 init_waitqueue_head(&stor_device->waiting_to_drain);
1487 stor_device->device = device;
1488 stor_device->host = host;
1489 hv_set_drvdata(device, stor_device);
1490
1491 stor_device->port_number = host->host_no;
1492 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
1493 if (ret)
1494 goto err_out1;
1495
1496 if (dev_is_ide)
1497 storvsc_get_ide_info(device, &target, &path);
1498
1499 host_dev->path = stor_device->path_id;
1500 host_dev->target = stor_device->target_id;
1501
1502 /* max # of devices per target */
1503 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
1504 /* max # of targets per channel */
1505 host->max_id = STORVSC_MAX_TARGETS;
1506 /* max # of channels */
1507 host->max_channel = STORVSC_MAX_CHANNELS - 1;
1508 /* max cmd length */
1509 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
1510
1511 /* Register the HBA and start the scsi bus scan */
1512 ret = scsi_add_host(host, &device->device);
1513 if (ret != 0)
1514 goto err_out2;
1515
1516 if (!dev_is_ide) {
1517 scsi_scan_host(host);
1518 return 0;
1519 }
1520 ret = scsi_add_device(host, 0, target, 0);
1521 if (ret) {
1522 scsi_remove_host(host);
1523 goto err_out2;
1524 }
1525 return 0;
1526
1527 err_out2:
1528 /*
1529 * Once we have connected with the host, we would need to
1530 * to invoke storvsc_dev_remove() to rollback this state and
1531 * this call also frees up the stor_device; hence the jump around
1532 * err_out1 label.
1533 */
1534 storvsc_dev_remove(device);
1535 goto err_out0;
1536
1537 err_out1:
1538 kfree(stor_device);
1539
1540 err_out0:
1541 scsi_host_put(host);
1542 return ret;
1543 }
1544
1545 /* The one and only one */
1546
1547 static struct hv_driver storvsc_drv = {
1548 .name = KBUILD_MODNAME,
1549 .id_table = id_table,
1550 .probe = storvsc_probe,
1551 .remove = storvsc_remove,
1552 };
1553
storvsc_drv_init(void)1554 static int __init storvsc_drv_init(void)
1555 {
1556 u32 max_outstanding_req_per_channel;
1557
1558 /*
1559 * Divide the ring buffer data size (which is 1 page less
1560 * than the ring buffer size since that page is reserved for
1561 * the ring buffer indices) by the max request size (which is
1562 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1563 */
1564 max_outstanding_req_per_channel =
1565 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1566 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
1567 sizeof(struct vstor_packet) + sizeof(u64),
1568 sizeof(u64)));
1569
1570 if (max_outstanding_req_per_channel <
1571 STORVSC_MAX_IO_REQUESTS)
1572 return -EINVAL;
1573
1574 return vmbus_driver_register(&storvsc_drv);
1575 }
1576
storvsc_drv_exit(void)1577 static void __exit storvsc_drv_exit(void)
1578 {
1579 vmbus_driver_unregister(&storvsc_drv);
1580 }
1581
1582 MODULE_LICENSE("GPL");
1583 MODULE_VERSION(HV_DRV_VERSION);
1584 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
1585 module_init(storvsc_drv_init);
1586 module_exit(storvsc_drv_exit);
1587