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13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/mempool.h>
18#include <linux/interrupt.h>
19#include <linux/virtio.h>
20#include <linux/virtio_ids.h>
21#include <linux/virtio_config.h>
22#include <linux/virtio_scsi.h>
23#include <linux/cpu.h>
24#include <linux/blkdev.h>
25#include <scsi/scsi_host.h>
26#include <scsi/scsi_device.h>
27#include <scsi/scsi_cmnd.h>
28#include <scsi/scsi_tcq.h>
29#include <scsi/scsi_devinfo.h>
30#include <linux/seqlock.h>
31#include <linux/blk-mq-virtio.h>
32
33#include "sd.h"
34
35#define VIRTIO_SCSI_MEMPOOL_SZ 64
36#define VIRTIO_SCSI_EVENT_LEN 8
37#define VIRTIO_SCSI_VQ_BASE 2
38
39
40struct virtio_scsi_cmd {
41 struct scsi_cmnd *sc;
42 struct completion *comp;
43 union {
44 struct virtio_scsi_cmd_req cmd;
45 struct virtio_scsi_cmd_req_pi cmd_pi;
46 struct virtio_scsi_ctrl_tmf_req tmf;
47 struct virtio_scsi_ctrl_an_req an;
48 } req;
49 union {
50 struct virtio_scsi_cmd_resp cmd;
51 struct virtio_scsi_ctrl_tmf_resp tmf;
52 struct virtio_scsi_ctrl_an_resp an;
53 struct virtio_scsi_event evt;
54 } resp;
55} ____cacheline_aligned_in_smp;
56
57struct virtio_scsi_event_node {
58 struct virtio_scsi *vscsi;
59 struct virtio_scsi_event event;
60 struct work_struct work;
61};
62
63struct virtio_scsi_vq {
64
65 spinlock_t vq_lock;
66
67 struct virtqueue *vq;
68};
69
70
71struct virtio_scsi {
72 struct virtio_device *vdev;
73
74
75 struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN];
76
77 u32 num_queues;
78
79 struct hlist_node node;
80
81
82 bool stop_events;
83
84 struct virtio_scsi_vq ctrl_vq;
85 struct virtio_scsi_vq event_vq;
86 struct virtio_scsi_vq req_vqs[];
87};
88
89static struct kmem_cache *virtscsi_cmd_cache;
90static mempool_t *virtscsi_cmd_pool;
91
92static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev)
93{
94 return vdev->priv;
95}
96
97static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid)
98{
99 if (resid)
100 scsi_set_resid(sc, resid);
101}
102
103
104
105
106
107
108static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
109{
110 struct virtio_scsi_cmd *cmd = buf;
111 struct scsi_cmnd *sc = cmd->sc;
112 struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd;
113
114 dev_dbg(&sc->device->sdev_gendev,
115 "cmd %p response %u status %#02x sense_len %u\n",
116 sc, resp->response, resp->status, resp->sense_len);
117
118 sc->result = resp->status;
119 virtscsi_compute_resid(sc, virtio32_to_cpu(vscsi->vdev, resp->resid));
120 switch (resp->response) {
121 case VIRTIO_SCSI_S_OK:
122 set_host_byte(sc, DID_OK);
123 break;
124 case VIRTIO_SCSI_S_OVERRUN:
125 set_host_byte(sc, DID_ERROR);
126 break;
127 case VIRTIO_SCSI_S_ABORTED:
128 set_host_byte(sc, DID_ABORT);
129 break;
130 case VIRTIO_SCSI_S_BAD_TARGET:
131 set_host_byte(sc, DID_BAD_TARGET);
132 break;
133 case VIRTIO_SCSI_S_RESET:
134 set_host_byte(sc, DID_RESET);
135 break;
136 case VIRTIO_SCSI_S_BUSY:
137 set_host_byte(sc, DID_BUS_BUSY);
138 break;
139 case VIRTIO_SCSI_S_TRANSPORT_FAILURE:
140 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
141 break;
142 case VIRTIO_SCSI_S_TARGET_FAILURE:
143 set_host_byte(sc, DID_TARGET_FAILURE);
144 break;
145 case VIRTIO_SCSI_S_NEXUS_FAILURE:
146 set_host_byte(sc, DID_NEXUS_FAILURE);
147 break;
148 default:
149 scmd_printk(KERN_WARNING, sc, "Unknown response %d",
150 resp->response);
151
152 case VIRTIO_SCSI_S_FAILURE:
153 set_host_byte(sc, DID_ERROR);
154 break;
155 }
156
157 WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) >
158 VIRTIO_SCSI_SENSE_SIZE);
159 if (sc->sense_buffer) {
160 memcpy(sc->sense_buffer, resp->sense,
161 min_t(u32,
162 virtio32_to_cpu(vscsi->vdev, resp->sense_len),
163 VIRTIO_SCSI_SENSE_SIZE));
164 if (resp->sense_len)
165 set_driver_byte(sc, DRIVER_SENSE);
166 }
167
168 sc->scsi_done(sc);
169}
170
171static void virtscsi_vq_done(struct virtio_scsi *vscsi,
172 struct virtio_scsi_vq *virtscsi_vq,
173 void (*fn)(struct virtio_scsi *vscsi, void *buf))
174{
175 void *buf;
176 unsigned int len;
177 unsigned long flags;
178 struct virtqueue *vq = virtscsi_vq->vq;
179
180 spin_lock_irqsave(&virtscsi_vq->vq_lock, flags);
181 do {
182 virtqueue_disable_cb(vq);
183 while ((buf = virtqueue_get_buf(vq, &len)) != NULL)
184 fn(vscsi, buf);
185
186 if (unlikely(virtqueue_is_broken(vq)))
187 break;
188 } while (!virtqueue_enable_cb(vq));
189 spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags);
190}
191
192static void virtscsi_req_done(struct virtqueue *vq)
193{
194 struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
195 struct virtio_scsi *vscsi = shost_priv(sh);
196 int index = vq->index - VIRTIO_SCSI_VQ_BASE;
197 struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index];
198
199 virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd);
200};
201
202static void virtscsi_poll_requests(struct virtio_scsi *vscsi)
203{
204 int i, num_vqs;
205
206 num_vqs = vscsi->num_queues;
207 for (i = 0; i < num_vqs; i++)
208 virtscsi_vq_done(vscsi, &vscsi->req_vqs[i],
209 virtscsi_complete_cmd);
210}
211
212static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf)
213{
214 struct virtio_scsi_cmd *cmd = buf;
215
216 if (cmd->comp)
217 complete(cmd->comp);
218}
219
220static void virtscsi_ctrl_done(struct virtqueue *vq)
221{
222 struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
223 struct virtio_scsi *vscsi = shost_priv(sh);
224
225 virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free);
226};
227
228static void virtscsi_handle_event(struct work_struct *work);
229
230static int virtscsi_kick_event(struct virtio_scsi *vscsi,
231 struct virtio_scsi_event_node *event_node)
232{
233 int err;
234 struct scatterlist sg;
235 unsigned long flags;
236
237 INIT_WORK(&event_node->work, virtscsi_handle_event);
238 sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event));
239
240 spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags);
241
242 err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node,
243 GFP_ATOMIC);
244 if (!err)
245 virtqueue_kick(vscsi->event_vq.vq);
246
247 spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags);
248
249 return err;
250}
251
252static int virtscsi_kick_event_all(struct virtio_scsi *vscsi)
253{
254 int i;
255
256 for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) {
257 vscsi->event_list[i].vscsi = vscsi;
258 virtscsi_kick_event(vscsi, &vscsi->event_list[i]);
259 }
260
261 return 0;
262}
263
264static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi)
265{
266 int i;
267
268
269 spin_lock_irq(&vscsi->event_vq.vq_lock);
270 vscsi->stop_events = true;
271 spin_unlock_irq(&vscsi->event_vq.vq_lock);
272
273 for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++)
274 cancel_work_sync(&vscsi->event_list[i].work);
275}
276
277static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi,
278 struct virtio_scsi_event *event)
279{
280 struct scsi_device *sdev;
281 struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
282 unsigned int target = event->lun[1];
283 unsigned int lun = (event->lun[2] << 8) | event->lun[3];
284
285 switch (virtio32_to_cpu(vscsi->vdev, event->reason)) {
286 case VIRTIO_SCSI_EVT_RESET_RESCAN:
287 scsi_add_device(shost, 0, target, lun);
288 break;
289 case VIRTIO_SCSI_EVT_RESET_REMOVED:
290 sdev = scsi_device_lookup(shost, 0, target, lun);
291 if (sdev) {
292 scsi_remove_device(sdev);
293 scsi_device_put(sdev);
294 } else {
295 pr_err("SCSI device %d 0 %d %d not found\n",
296 shost->host_no, target, lun);
297 }
298 break;
299 default:
300 pr_info("Unsupport virtio scsi event reason %x\n", event->reason);
301 }
302}
303
304static void virtscsi_handle_param_change(struct virtio_scsi *vscsi,
305 struct virtio_scsi_event *event)
306{
307 struct scsi_device *sdev;
308 struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
309 unsigned int target = event->lun[1];
310 unsigned int lun = (event->lun[2] << 8) | event->lun[3];
311 u8 asc = virtio32_to_cpu(vscsi->vdev, event->reason) & 255;
312 u8 ascq = virtio32_to_cpu(vscsi->vdev, event->reason) >> 8;
313
314 sdev = scsi_device_lookup(shost, 0, target, lun);
315 if (!sdev) {
316 pr_err("SCSI device %d 0 %d %d not found\n",
317 shost->host_no, target, lun);
318 return;
319 }
320
321
322
323 if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09))
324 scsi_rescan_device(&sdev->sdev_gendev);
325
326 scsi_device_put(sdev);
327}
328
329static void virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi)
330{
331 struct scsi_device *sdev;
332 struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
333 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
334 int result, inquiry_len, inq_result_len = 256;
335 char *inq_result = kmalloc(inq_result_len, GFP_KERNEL);
336
337 shost_for_each_device(sdev, shost) {
338 inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
339
340 memset(scsi_cmd, 0, sizeof(scsi_cmd));
341 scsi_cmd[0] = INQUIRY;
342 scsi_cmd[4] = (unsigned char) inquiry_len;
343
344 memset(inq_result, 0, inq_result_len);
345
346 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
347 inq_result, inquiry_len, NULL,
348 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
349
350 if (result == 0 && inq_result[0] >> 5) {
351
352 scsi_remove_device(sdev);
353 }
354 }
355
356 kfree(inq_result);
357}
358
359static void virtscsi_handle_event(struct work_struct *work)
360{
361 struct virtio_scsi_event_node *event_node =
362 container_of(work, struct virtio_scsi_event_node, work);
363 struct virtio_scsi *vscsi = event_node->vscsi;
364 struct virtio_scsi_event *event = &event_node->event;
365
366 if (event->event &
367 cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) {
368 event->event &= ~cpu_to_virtio32(vscsi->vdev,
369 VIRTIO_SCSI_T_EVENTS_MISSED);
370 virtscsi_rescan_hotunplug(vscsi);
371 scsi_scan_host(virtio_scsi_host(vscsi->vdev));
372 }
373
374 switch (virtio32_to_cpu(vscsi->vdev, event->event)) {
375 case VIRTIO_SCSI_T_NO_EVENT:
376 break;
377 case VIRTIO_SCSI_T_TRANSPORT_RESET:
378 virtscsi_handle_transport_reset(vscsi, event);
379 break;
380 case VIRTIO_SCSI_T_PARAM_CHANGE:
381 virtscsi_handle_param_change(vscsi, event);
382 break;
383 default:
384 pr_err("Unsupport virtio scsi event %x\n", event->event);
385 }
386 virtscsi_kick_event(vscsi, event_node);
387}
388
389static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf)
390{
391 struct virtio_scsi_event_node *event_node = buf;
392
393 if (!vscsi->stop_events)
394 queue_work(system_freezable_wq, &event_node->work);
395}
396
397static void virtscsi_event_done(struct virtqueue *vq)
398{
399 struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
400 struct virtio_scsi *vscsi = shost_priv(sh);
401
402 virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event);
403};
404
405static int __virtscsi_add_cmd(struct virtqueue *vq,
406 struct virtio_scsi_cmd *cmd,
407 size_t req_size, size_t resp_size)
408{
409 struct scsi_cmnd *sc = cmd->sc;
410 struct scatterlist *sgs[6], req, resp;
411 struct sg_table *out, *in;
412 unsigned out_num = 0, in_num = 0;
413
414 out = in = NULL;
415
416 if (sc && sc->sc_data_direction != DMA_NONE) {
417 if (sc->sc_data_direction != DMA_FROM_DEVICE)
418 out = &sc->sdb.table;
419 if (sc->sc_data_direction != DMA_TO_DEVICE)
420 in = &sc->sdb.table;
421 }
422
423
424 sg_init_one(&req, &cmd->req, req_size);
425 sgs[out_num++] = &req;
426
427
428 if (out) {
429
430 if (scsi_prot_sg_count(sc))
431 sgs[out_num++] = scsi_prot_sglist(sc);
432 sgs[out_num++] = out->sgl;
433 }
434
435
436 sg_init_one(&resp, &cmd->resp, resp_size);
437 sgs[out_num + in_num++] = &resp;
438
439
440 if (in) {
441
442 if (scsi_prot_sg_count(sc))
443 sgs[out_num + in_num++] = scsi_prot_sglist(sc);
444 sgs[out_num + in_num++] = in->sgl;
445 }
446
447 return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC);
448}
449
450static void virtscsi_kick_vq(struct virtio_scsi_vq *vq)
451{
452 bool needs_kick;
453 unsigned long flags;
454
455 spin_lock_irqsave(&vq->vq_lock, flags);
456 needs_kick = virtqueue_kick_prepare(vq->vq);
457 spin_unlock_irqrestore(&vq->vq_lock, flags);
458
459 if (needs_kick)
460 virtqueue_notify(vq->vq);
461}
462
463
464
465
466
467
468
469
470
471static int virtscsi_add_cmd(struct virtio_scsi_vq *vq,
472 struct virtio_scsi_cmd *cmd,
473 size_t req_size, size_t resp_size,
474 bool kick)
475{
476 unsigned long flags;
477 int err;
478 bool needs_kick = false;
479
480 spin_lock_irqsave(&vq->vq_lock, flags);
481 err = __virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size);
482 if (!err && kick)
483 needs_kick = virtqueue_kick_prepare(vq->vq);
484
485 spin_unlock_irqrestore(&vq->vq_lock, flags);
486
487 if (needs_kick)
488 virtqueue_notify(vq->vq);
489 return err;
490}
491
492static void virtio_scsi_init_hdr(struct virtio_device *vdev,
493 struct virtio_scsi_cmd_req *cmd,
494 struct scsi_cmnd *sc)
495{
496 cmd->lun[0] = 1;
497 cmd->lun[1] = sc->device->id;
498 cmd->lun[2] = (sc->device->lun >> 8) | 0x40;
499 cmd->lun[3] = sc->device->lun & 0xff;
500 cmd->tag = cpu_to_virtio64(vdev, (unsigned long)sc);
501 cmd->task_attr = VIRTIO_SCSI_S_SIMPLE;
502 cmd->prio = 0;
503 cmd->crn = 0;
504}
505
506#ifdef CONFIG_BLK_DEV_INTEGRITY
507static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev,
508 struct virtio_scsi_cmd_req_pi *cmd_pi,
509 struct scsi_cmnd *sc)
510{
511 struct request *rq = sc->request;
512 struct blk_integrity *bi;
513
514 virtio_scsi_init_hdr(vdev, (struct virtio_scsi_cmd_req *)cmd_pi, sc);
515
516 if (!rq || !scsi_prot_sg_count(sc))
517 return;
518
519 bi = blk_get_integrity(rq->rq_disk);
520
521 if (sc->sc_data_direction == DMA_TO_DEVICE)
522 cmd_pi->pi_bytesout = cpu_to_virtio32(vdev,
523 bio_integrity_bytes(bi,
524 blk_rq_sectors(rq)));
525 else if (sc->sc_data_direction == DMA_FROM_DEVICE)
526 cmd_pi->pi_bytesin = cpu_to_virtio32(vdev,
527 bio_integrity_bytes(bi,
528 blk_rq_sectors(rq)));
529}
530#endif
531
532static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi,
533 struct scsi_cmnd *sc)
534{
535 u32 tag = blk_mq_unique_tag(sc->request);
536 u16 hwq = blk_mq_unique_tag_to_hwq(tag);
537
538 return &vscsi->req_vqs[hwq];
539}
540
541static int virtscsi_queuecommand(struct Scsi_Host *shost,
542 struct scsi_cmnd *sc)
543{
544 struct virtio_scsi *vscsi = shost_priv(shost);
545 struct virtio_scsi_vq *req_vq = virtscsi_pick_vq_mq(vscsi, sc);
546 struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc);
547 bool kick;
548 unsigned long flags;
549 int req_size;
550 int ret;
551
552 BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize);
553
554
555 BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL);
556
557 dev_dbg(&sc->device->sdev_gendev,
558 "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]);
559
560 cmd->sc = sc;
561
562 BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE);
563
564#ifdef CONFIG_BLK_DEV_INTEGRITY
565 if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) {
566 virtio_scsi_init_hdr_pi(vscsi->vdev, &cmd->req.cmd_pi, sc);
567 memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len);
568 req_size = sizeof(cmd->req.cmd_pi);
569 } else
570#endif
571 {
572 virtio_scsi_init_hdr(vscsi->vdev, &cmd->req.cmd, sc);
573 memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len);
574 req_size = sizeof(cmd->req.cmd);
575 }
576
577 kick = (sc->flags & SCMD_LAST) != 0;
578 ret = virtscsi_add_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd), kick);
579 if (ret == -EIO) {
580 cmd->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
581 spin_lock_irqsave(&req_vq->vq_lock, flags);
582 virtscsi_complete_cmd(vscsi, cmd);
583 spin_unlock_irqrestore(&req_vq->vq_lock, flags);
584 } else if (ret != 0) {
585 return SCSI_MLQUEUE_HOST_BUSY;
586 }
587 return 0;
588}
589
590static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd)
591{
592 DECLARE_COMPLETION_ONSTACK(comp);
593 int ret = FAILED;
594
595 cmd->comp = ∁
596 if (virtscsi_add_cmd(&vscsi->ctrl_vq, cmd,
597 sizeof cmd->req.tmf, sizeof cmd->resp.tmf, true) < 0)
598 goto out;
599
600 wait_for_completion(&comp);
601 if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK ||
602 cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED)
603 ret = SUCCESS;
604
605
606
607
608
609
610
611
612
613
614
615 virtscsi_poll_requests(vscsi);
616
617out:
618 mempool_free(cmd, virtscsi_cmd_pool);
619 return ret;
620}
621
622static int virtscsi_device_reset(struct scsi_cmnd *sc)
623{
624 struct virtio_scsi *vscsi = shost_priv(sc->device->host);
625 struct virtio_scsi_cmd *cmd;
626
627 sdev_printk(KERN_INFO, sc->device, "device reset\n");
628 cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO);
629 if (!cmd)
630 return FAILED;
631
632 memset(cmd, 0, sizeof(*cmd));
633 cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
634 .type = VIRTIO_SCSI_T_TMF,
635 .subtype = cpu_to_virtio32(vscsi->vdev,
636 VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET),
637 .lun[0] = 1,
638 .lun[1] = sc->device->id,
639 .lun[2] = (sc->device->lun >> 8) | 0x40,
640 .lun[3] = sc->device->lun & 0xff,
641 };
642 return virtscsi_tmf(vscsi, cmd);
643}
644
645static int virtscsi_device_alloc(struct scsi_device *sdevice)
646{
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661 sdevice->sdev_bflags = BLIST_TRY_VPD_PAGES;
662
663 return 0;
664}
665
666
667
668
669
670
671
672static int virtscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
673{
674 struct Scsi_Host *shost = sdev->host;
675 int max_depth = shost->cmd_per_lun;
676
677 return scsi_change_queue_depth(sdev, min(max_depth, qdepth));
678}
679
680static int virtscsi_abort(struct scsi_cmnd *sc)
681{
682 struct virtio_scsi *vscsi = shost_priv(sc->device->host);
683 struct virtio_scsi_cmd *cmd;
684
685 scmd_printk(KERN_INFO, sc, "abort\n");
686 cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO);
687 if (!cmd)
688 return FAILED;
689
690 memset(cmd, 0, sizeof(*cmd));
691 cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
692 .type = VIRTIO_SCSI_T_TMF,
693 .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK,
694 .lun[0] = 1,
695 .lun[1] = sc->device->id,
696 .lun[2] = (sc->device->lun >> 8) | 0x40,
697 .lun[3] = sc->device->lun & 0xff,
698 .tag = cpu_to_virtio64(vscsi->vdev, (unsigned long)sc),
699 };
700 return virtscsi_tmf(vscsi, cmd);
701}
702
703static int virtscsi_map_queues(struct Scsi_Host *shost)
704{
705 struct virtio_scsi *vscsi = shost_priv(shost);
706 struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT];
707
708 return blk_mq_virtio_map_queues(qmap, vscsi->vdev, 2);
709}
710
711static void virtscsi_commit_rqs(struct Scsi_Host *shost, u16 hwq)
712{
713 struct virtio_scsi *vscsi = shost_priv(shost);
714
715 virtscsi_kick_vq(&vscsi->req_vqs[hwq]);
716}
717
718
719
720
721
722
723static enum blk_eh_timer_return virtscsi_eh_timed_out(struct scsi_cmnd *scmnd)
724{
725 return BLK_EH_RESET_TIMER;
726}
727
728static struct scsi_host_template virtscsi_host_template = {
729 .module = THIS_MODULE,
730 .name = "Virtio SCSI HBA",
731 .proc_name = "virtio_scsi",
732 .this_id = -1,
733 .cmd_size = sizeof(struct virtio_scsi_cmd),
734 .queuecommand = virtscsi_queuecommand,
735 .commit_rqs = virtscsi_commit_rqs,
736 .change_queue_depth = virtscsi_change_queue_depth,
737 .eh_abort_handler = virtscsi_abort,
738 .eh_device_reset_handler = virtscsi_device_reset,
739 .eh_timed_out = virtscsi_eh_timed_out,
740 .slave_alloc = virtscsi_device_alloc,
741
742 .dma_boundary = UINT_MAX,
743 .map_queues = virtscsi_map_queues,
744 .track_queue_depth = 1,
745};
746
747#define virtscsi_config_get(vdev, fld) \
748 ({ \
749 typeof(((struct virtio_scsi_config *)0)->fld) __val; \
750 virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \
751 __val; \
752 })
753
754#define virtscsi_config_set(vdev, fld, val) \
755 do { \
756 typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \
757 virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \
758 } while(0)
759
760static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq,
761 struct virtqueue *vq)
762{
763 spin_lock_init(&virtscsi_vq->vq_lock);
764 virtscsi_vq->vq = vq;
765}
766
767static void virtscsi_remove_vqs(struct virtio_device *vdev)
768{
769
770 vdev->config->reset(vdev);
771 vdev->config->del_vqs(vdev);
772}
773
774static int virtscsi_init(struct virtio_device *vdev,
775 struct virtio_scsi *vscsi)
776{
777 int err;
778 u32 i;
779 u32 num_vqs;
780 vq_callback_t **callbacks;
781 const char **names;
782 struct virtqueue **vqs;
783 struct irq_affinity desc = { .pre_vectors = 2 };
784
785 num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE;
786 vqs = kmalloc_array(num_vqs, sizeof(struct virtqueue *), GFP_KERNEL);
787 callbacks = kmalloc_array(num_vqs, sizeof(vq_callback_t *),
788 GFP_KERNEL);
789 names = kmalloc_array(num_vqs, sizeof(char *), GFP_KERNEL);
790
791 if (!callbacks || !vqs || !names) {
792 err = -ENOMEM;
793 goto out;
794 }
795
796 callbacks[0] = virtscsi_ctrl_done;
797 callbacks[1] = virtscsi_event_done;
798 names[0] = "control";
799 names[1] = "event";
800 for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) {
801 callbacks[i] = virtscsi_req_done;
802 names[i] = "request";
803 }
804
805
806 err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc);
807 if (err)
808 goto out;
809
810 virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]);
811 virtscsi_init_vq(&vscsi->event_vq, vqs[1]);
812 for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++)
813 virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE],
814 vqs[i]);
815
816 virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE);
817 virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE);
818
819 err = 0;
820
821out:
822 kfree(names);
823 kfree(callbacks);
824 kfree(vqs);
825 if (err)
826 virtscsi_remove_vqs(vdev);
827 return err;
828}
829
830static int virtscsi_probe(struct virtio_device *vdev)
831{
832 struct Scsi_Host *shost;
833 struct virtio_scsi *vscsi;
834 int err;
835 u32 sg_elems, num_targets;
836 u32 cmd_per_lun;
837 u32 num_queues;
838
839 if (!vdev->config->get) {
840 dev_err(&vdev->dev, "%s failure: config access disabled\n",
841 __func__);
842 return -EINVAL;
843 }
844
845
846 num_queues = virtscsi_config_get(vdev, num_queues) ? : 1;
847 num_queues = min_t(unsigned int, nr_cpu_ids, num_queues);
848
849 num_targets = virtscsi_config_get(vdev, max_target) + 1;
850
851 shost = scsi_host_alloc(&virtscsi_host_template,
852 struct_size(vscsi, req_vqs, num_queues));
853 if (!shost)
854 return -ENOMEM;
855
856 sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
857 shost->sg_tablesize = sg_elems;
858 vscsi = shost_priv(shost);
859 vscsi->vdev = vdev;
860 vscsi->num_queues = num_queues;
861 vdev->priv = shost;
862
863 err = virtscsi_init(vdev, vscsi);
864 if (err)
865 goto virtscsi_init_failed;
866
867 shost->can_queue = virtqueue_get_vring_size(vscsi->req_vqs[0].vq);
868
869 cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1;
870 shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue);
871 shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF;
872
873
874
875
876 shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000;
877 shost->max_id = num_targets;
878 shost->max_channel = 0;
879 shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE;
880 shost->nr_hw_queues = num_queues;
881
882#ifdef CONFIG_BLK_DEV_INTEGRITY
883 if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) {
884 int host_prot;
885
886 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
887 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
888 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
889
890 scsi_host_set_prot(shost, host_prot);
891 scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);
892 }
893#endif
894
895 err = scsi_add_host(shost, &vdev->dev);
896 if (err)
897 goto scsi_add_host_failed;
898
899 virtio_device_ready(vdev);
900
901 if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
902 virtscsi_kick_event_all(vscsi);
903
904 scsi_scan_host(shost);
905 return 0;
906
907scsi_add_host_failed:
908 vdev->config->del_vqs(vdev);
909virtscsi_init_failed:
910 scsi_host_put(shost);
911 return err;
912}
913
914static void virtscsi_remove(struct virtio_device *vdev)
915{
916 struct Scsi_Host *shost = virtio_scsi_host(vdev);
917 struct virtio_scsi *vscsi = shost_priv(shost);
918
919 if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
920 virtscsi_cancel_event_work(vscsi);
921
922 scsi_remove_host(shost);
923 virtscsi_remove_vqs(vdev);
924 scsi_host_put(shost);
925}
926
927#ifdef CONFIG_PM_SLEEP
928static int virtscsi_freeze(struct virtio_device *vdev)
929{
930 virtscsi_remove_vqs(vdev);
931 return 0;
932}
933
934static int virtscsi_restore(struct virtio_device *vdev)
935{
936 struct Scsi_Host *sh = virtio_scsi_host(vdev);
937 struct virtio_scsi *vscsi = shost_priv(sh);
938 int err;
939
940 err = virtscsi_init(vdev, vscsi);
941 if (err)
942 return err;
943
944 virtio_device_ready(vdev);
945
946 if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
947 virtscsi_kick_event_all(vscsi);
948
949 return err;
950}
951#endif
952
953static struct virtio_device_id id_table[] = {
954 { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID },
955 { 0 },
956};
957
958static unsigned int features[] = {
959 VIRTIO_SCSI_F_HOTPLUG,
960 VIRTIO_SCSI_F_CHANGE,
961#ifdef CONFIG_BLK_DEV_INTEGRITY
962 VIRTIO_SCSI_F_T10_PI,
963#endif
964};
965
966static struct virtio_driver virtio_scsi_driver = {
967 .feature_table = features,
968 .feature_table_size = ARRAY_SIZE(features),
969 .driver.name = KBUILD_MODNAME,
970 .driver.owner = THIS_MODULE,
971 .id_table = id_table,
972 .probe = virtscsi_probe,
973#ifdef CONFIG_PM_SLEEP
974 .freeze = virtscsi_freeze,
975 .restore = virtscsi_restore,
976#endif
977 .remove = virtscsi_remove,
978};
979
980static int __init init(void)
981{
982 int ret = -ENOMEM;
983
984 virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0);
985 if (!virtscsi_cmd_cache) {
986 pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n");
987 goto error;
988 }
989
990
991 virtscsi_cmd_pool =
992 mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ,
993 virtscsi_cmd_cache);
994 if (!virtscsi_cmd_pool) {
995 pr_err("mempool_create() for virtscsi_cmd_pool failed\n");
996 goto error;
997 }
998 ret = register_virtio_driver(&virtio_scsi_driver);
999 if (ret < 0)
1000 goto error;
1001
1002 return 0;
1003
1004error:
1005 if (virtscsi_cmd_pool) {
1006 mempool_destroy(virtscsi_cmd_pool);
1007 virtscsi_cmd_pool = NULL;
1008 }
1009 if (virtscsi_cmd_cache) {
1010 kmem_cache_destroy(virtscsi_cmd_cache);
1011 virtscsi_cmd_cache = NULL;
1012 }
1013 return ret;
1014}
1015
1016static void __exit fini(void)
1017{
1018 unregister_virtio_driver(&virtio_scsi_driver);
1019 mempool_destroy(virtscsi_cmd_pool);
1020 kmem_cache_destroy(virtscsi_cmd_cache);
1021}
1022module_init(init);
1023module_exit(fini);
1024
1025MODULE_DEVICE_TABLE(virtio, id_table);
1026MODULE_DESCRIPTION("Virtio SCSI HBA driver");
1027MODULE_LICENSE("GPL");
1028
