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1 | /* |
2 | * Virtio SCSI HBA driver |
3 | * |
4 | * Copyright IBM Corp. 2010 |
5 | * Copyright Red Hat, Inc. 2011 |
6 | * |
7 | * Authors: |
8 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
9 | * Paolo Bonzini <pbonzini@redhat.com> |
10 | * |
11 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
12 | * See the COPYING file in the top-level directory. |
13 | * |
14 | */ |
15 | |
16 | #include <linux/module.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/mempool.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 <scsi/scsi_host.h> |
24 | #include <scsi/scsi_device.h> |
25 | #include <scsi/scsi_cmnd.h> |
26 | |
27 | #define VIRTIO_SCSI_MEMPOOL_SZ 64 |
28 | #define VIRTIO_SCSI_EVENT_LEN 8 |
29 | |
30 | /* Command queue element */ |
31 | struct virtio_scsi_cmd { |
32 | struct scsi_cmnd *sc; |
33 | struct completion *comp; |
34 | union { |
35 | struct virtio_scsi_cmd_req cmd; |
36 | struct virtio_scsi_ctrl_tmf_req tmf; |
37 | struct virtio_scsi_ctrl_an_req an; |
38 | } req; |
39 | union { |
40 | struct virtio_scsi_cmd_resp cmd; |
41 | struct virtio_scsi_ctrl_tmf_resp tmf; |
42 | struct virtio_scsi_ctrl_an_resp an; |
43 | struct virtio_scsi_event evt; |
44 | } resp; |
45 | } ____cacheline_aligned_in_smp; |
46 | |
47 | struct virtio_scsi_event_node { |
48 | struct virtio_scsi *vscsi; |
49 | struct virtio_scsi_event event; |
50 | struct work_struct work; |
51 | }; |
52 | |
53 | struct virtio_scsi_vq { |
54 | /* Protects vq */ |
55 | spinlock_t vq_lock; |
56 | |
57 | struct virtqueue *vq; |
58 | }; |
59 | |
60 | /* Per-target queue state */ |
61 | struct virtio_scsi_target_state { |
62 | /* Protects sg. Lock hierarchy is tgt_lock -> vq_lock. */ |
63 | spinlock_t tgt_lock; |
64 | |
65 | /* For sglist construction when adding commands to the virtqueue. */ |
66 | struct scatterlist sg[]; |
67 | }; |
68 | |
69 | /* Driver instance state */ |
70 | struct virtio_scsi { |
71 | struct virtio_device *vdev; |
72 | |
73 | struct virtio_scsi_vq ctrl_vq; |
74 | struct virtio_scsi_vq event_vq; |
75 | struct virtio_scsi_vq req_vq; |
76 | |
77 | /* Get some buffers ready for event vq */ |
78 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; |
79 | |
80 | struct virtio_scsi_target_state *tgt[]; |
81 | }; |
82 | |
83 | static struct kmem_cache *virtscsi_cmd_cache; |
84 | static mempool_t *virtscsi_cmd_pool; |
85 | |
86 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) |
87 | { |
88 | return vdev->priv; |
89 | } |
90 | |
91 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) |
92 | { |
93 | if (!resid) |
94 | return; |
95 | |
96 | if (!scsi_bidi_cmnd(sc)) { |
97 | scsi_set_resid(sc, resid); |
98 | return; |
99 | } |
100 | |
101 | scsi_in(sc)->resid = min(resid, scsi_in(sc)->length); |
102 | scsi_out(sc)->resid = resid - scsi_in(sc)->resid; |
103 | } |
104 | |
105 | /** |
106 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done |
107 | * |
108 | * Called with vq_lock held. |
109 | */ |
110 | static void virtscsi_complete_cmd(void *buf) |
111 | { |
112 | struct virtio_scsi_cmd *cmd = buf; |
113 | struct scsi_cmnd *sc = cmd->sc; |
114 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; |
115 | |
116 | dev_dbg(&sc->device->sdev_gendev, |
117 | "cmd %p response %u status %#02x sense_len %u\n", |
118 | sc, resp->response, resp->status, resp->sense_len); |
119 | |
120 | sc->result = resp->status; |
121 | virtscsi_compute_resid(sc, resp->resid); |
122 | switch (resp->response) { |
123 | case VIRTIO_SCSI_S_OK: |
124 | set_host_byte(sc, DID_OK); |
125 | break; |
126 | case VIRTIO_SCSI_S_OVERRUN: |
127 | set_host_byte(sc, DID_ERROR); |
128 | break; |
129 | case VIRTIO_SCSI_S_ABORTED: |
130 | set_host_byte(sc, DID_ABORT); |
131 | break; |
132 | case VIRTIO_SCSI_S_BAD_TARGET: |
133 | set_host_byte(sc, DID_BAD_TARGET); |
134 | break; |
135 | case VIRTIO_SCSI_S_RESET: |
136 | set_host_byte(sc, DID_RESET); |
137 | break; |
138 | case VIRTIO_SCSI_S_BUSY: |
139 | set_host_byte(sc, DID_BUS_BUSY); |
140 | break; |
141 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: |
142 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); |
143 | break; |
144 | case VIRTIO_SCSI_S_TARGET_FAILURE: |
145 | set_host_byte(sc, DID_TARGET_FAILURE); |
146 | break; |
147 | case VIRTIO_SCSI_S_NEXUS_FAILURE: |
148 | set_host_byte(sc, DID_NEXUS_FAILURE); |
149 | break; |
150 | default: |
151 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", |
152 | resp->response); |
153 | /* fall through */ |
154 | case VIRTIO_SCSI_S_FAILURE: |
155 | set_host_byte(sc, DID_ERROR); |
156 | break; |
157 | } |
158 | |
159 | WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE); |
160 | if (sc->sense_buffer) { |
161 | memcpy(sc->sense_buffer, resp->sense, |
162 | min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE)); |
163 | if (resp->sense_len) |
164 | set_driver_byte(sc, DRIVER_SENSE); |
165 | } |
166 | |
167 | mempool_free(cmd, virtscsi_cmd_pool); |
168 | sc->scsi_done(sc); |
169 | } |
170 | |
171 | static void virtscsi_vq_done(struct virtqueue *vq, void (*fn)(void *buf)) |
172 | { |
173 | void *buf; |
174 | unsigned int len; |
175 | |
176 | do { |
177 | virtqueue_disable_cb(vq); |
178 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) |
179 | fn(buf); |
180 | } while (!virtqueue_enable_cb(vq)); |
181 | } |
182 | |
183 | static void virtscsi_req_done(struct virtqueue *vq) |
184 | { |
185 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
186 | struct virtio_scsi *vscsi = shost_priv(sh); |
187 | unsigned long flags; |
188 | |
189 | spin_lock_irqsave(&vscsi->req_vq.vq_lock, flags); |
190 | virtscsi_vq_done(vq, virtscsi_complete_cmd); |
191 | spin_unlock_irqrestore(&vscsi->req_vq.vq_lock, flags); |
192 | }; |
193 | |
194 | static void virtscsi_complete_free(void *buf) |
195 | { |
196 | struct virtio_scsi_cmd *cmd = buf; |
197 | |
198 | if (cmd->comp) |
199 | complete_all(cmd->comp); |
200 | else |
201 | mempool_free(cmd, virtscsi_cmd_pool); |
202 | } |
203 | |
204 | static void virtscsi_ctrl_done(struct virtqueue *vq) |
205 | { |
206 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
207 | struct virtio_scsi *vscsi = shost_priv(sh); |
208 | unsigned long flags; |
209 | |
210 | spin_lock_irqsave(&vscsi->ctrl_vq.vq_lock, flags); |
211 | virtscsi_vq_done(vq, virtscsi_complete_free); |
212 | spin_unlock_irqrestore(&vscsi->ctrl_vq.vq_lock, flags); |
213 | }; |
214 | |
215 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
216 | struct virtio_scsi_event_node *event_node) |
217 | { |
218 | int err; |
219 | struct scatterlist sg; |
220 | unsigned long flags; |
221 | |
222 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
223 | |
224 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); |
225 | |
226 | err = virtqueue_add_buf(vscsi->event_vq.vq, &sg, 0, 1, event_node, |
227 | GFP_ATOMIC); |
228 | if (!err) |
229 | virtqueue_kick(vscsi->event_vq.vq); |
230 | |
231 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); |
232 | |
233 | return err; |
234 | } |
235 | |
236 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) |
237 | { |
238 | int i; |
239 | |
240 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { |
241 | vscsi->event_list[i].vscsi = vscsi; |
242 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); |
243 | } |
244 | |
245 | return 0; |
246 | } |
247 | |
248 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) |
249 | { |
250 | int i; |
251 | |
252 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) |
253 | cancel_work_sync(&vscsi->event_list[i].work); |
254 | } |
255 | |
256 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, |
257 | struct virtio_scsi_event *event) |
258 | { |
259 | struct scsi_device *sdev; |
260 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
261 | unsigned int target = event->lun[1]; |
262 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; |
263 | |
264 | switch (event->reason) { |
265 | case VIRTIO_SCSI_EVT_RESET_RESCAN: |
266 | scsi_add_device(shost, 0, target, lun); |
267 | break; |
268 | case VIRTIO_SCSI_EVT_RESET_REMOVED: |
269 | sdev = scsi_device_lookup(shost, 0, target, lun); |
270 | if (sdev) { |
271 | scsi_remove_device(sdev); |
272 | scsi_device_put(sdev); |
273 | } else { |
274 | pr_err("SCSI device %d 0 %d %d not found\n", |
275 | shost->host_no, target, lun); |
276 | } |
277 | break; |
278 | default: |
279 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); |
280 | } |
281 | } |
282 | |
283 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
284 | struct virtio_scsi_event *event) |
285 | { |
286 | struct scsi_device *sdev; |
287 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
288 | unsigned int target = event->lun[1]; |
289 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; |
290 | u8 asc = event->reason & 255; |
291 | u8 ascq = event->reason >> 8; |
292 | |
293 | sdev = scsi_device_lookup(shost, 0, target, lun); |
294 | if (!sdev) { |
295 | pr_err("SCSI device %d 0 %d %d not found\n", |
296 | shost->host_no, target, lun); |
297 | return; |
298 | } |
299 | |
300 | /* Handle "Parameters changed", "Mode parameters changed", and |
301 | "Capacity data has changed". */ |
302 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) |
303 | scsi_rescan_device(&sdev->sdev_gendev); |
304 | |
305 | scsi_device_put(sdev); |
306 | } |
307 | |
308 | static void virtscsi_handle_event(struct work_struct *work) |
309 | { |
310 | struct virtio_scsi_event_node *event_node = |
311 | container_of(work, struct virtio_scsi_event_node, work); |
312 | struct virtio_scsi *vscsi = event_node->vscsi; |
313 | struct virtio_scsi_event *event = &event_node->event; |
314 | |
315 | if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) { |
316 | event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED; |
317 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); |
318 | } |
319 | |
320 | switch (event->event) { |
321 | case VIRTIO_SCSI_T_NO_EVENT: |
322 | break; |
323 | case VIRTIO_SCSI_T_TRANSPORT_RESET: |
324 | virtscsi_handle_transport_reset(vscsi, event); |
325 | break; |
326 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
327 | virtscsi_handle_param_change(vscsi, event); |
328 | break; |
329 | default: |
330 | pr_err("Unsupport virtio scsi event %x\n", event->event); |
331 | } |
332 | virtscsi_kick_event(vscsi, event_node); |
333 | } |
334 | |
335 | static void virtscsi_complete_event(void *buf) |
336 | { |
337 | struct virtio_scsi_event_node *event_node = buf; |
338 | |
339 | INIT_WORK(&event_node->work, virtscsi_handle_event); |
340 | schedule_work(&event_node->work); |
341 | } |
342 | |
343 | static void virtscsi_event_done(struct virtqueue *vq) |
344 | { |
345 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
346 | struct virtio_scsi *vscsi = shost_priv(sh); |
347 | unsigned long flags; |
348 | |
349 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); |
350 | virtscsi_vq_done(vq, virtscsi_complete_event); |
351 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); |
352 | }; |
353 | |
354 | static void virtscsi_map_sgl(struct scatterlist *sg, unsigned int *p_idx, |
355 | struct scsi_data_buffer *sdb) |
356 | { |
357 | struct sg_table *table = &sdb->table; |
358 | struct scatterlist *sg_elem; |
359 | unsigned int idx = *p_idx; |
360 | int i; |
361 | |
362 | for_each_sg(table->sgl, sg_elem, table->nents, i) |
363 | sg[idx++] = *sg_elem; |
364 | |
365 | *p_idx = idx; |
366 | } |
367 | |
368 | /** |
369 | * virtscsi_map_cmd - map a scsi_cmd to a virtqueue scatterlist |
370 | * @vscsi : virtio_scsi state |
371 | * @cmd : command structure |
372 | * @out_num : number of read-only elements |
373 | * @in_num : number of write-only elements |
374 | * @req_size : size of the request buffer |
375 | * @resp_size : size of the response buffer |
376 | * |
377 | * Called with tgt_lock held. |
378 | */ |
379 | static void virtscsi_map_cmd(struct virtio_scsi_target_state *tgt, |
380 | struct virtio_scsi_cmd *cmd, |
381 | unsigned *out_num, unsigned *in_num, |
382 | size_t req_size, size_t resp_size) |
383 | { |
384 | struct scsi_cmnd *sc = cmd->sc; |
385 | struct scatterlist *sg = tgt->sg; |
386 | unsigned int idx = 0; |
387 | |
388 | /* Request header. */ |
389 | sg_set_buf(&sg[idx++], &cmd->req, req_size); |
390 | |
391 | /* Data-out buffer. */ |
392 | if (sc && sc->sc_data_direction != DMA_FROM_DEVICE) |
393 | virtscsi_map_sgl(sg, &idx, scsi_out(sc)); |
394 | |
395 | *out_num = idx; |
396 | |
397 | /* Response header. */ |
398 | sg_set_buf(&sg[idx++], &cmd->resp, resp_size); |
399 | |
400 | /* Data-in buffer */ |
401 | if (sc && sc->sc_data_direction != DMA_TO_DEVICE) |
402 | virtscsi_map_sgl(sg, &idx, scsi_in(sc)); |
403 | |
404 | *in_num = idx - *out_num; |
405 | } |
406 | |
407 | static int virtscsi_kick_cmd(struct virtio_scsi_target_state *tgt, |
408 | struct virtio_scsi_vq *vq, |
409 | struct virtio_scsi_cmd *cmd, |
410 | size_t req_size, size_t resp_size, gfp_t gfp) |
411 | { |
412 | unsigned int out_num, in_num; |
413 | unsigned long flags; |
414 | int err; |
415 | bool needs_kick = false; |
416 | |
417 | spin_lock_irqsave(&tgt->tgt_lock, flags); |
418 | virtscsi_map_cmd(tgt, cmd, &out_num, &in_num, req_size, resp_size); |
419 | |
420 | spin_lock(&vq->vq_lock); |
421 | err = virtqueue_add_buf(vq->vq, tgt->sg, out_num, in_num, cmd, gfp); |
422 | spin_unlock(&tgt->tgt_lock); |
423 | if (!err) |
424 | needs_kick = virtqueue_kick_prepare(vq->vq); |
425 | |
426 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
427 | |
428 | if (needs_kick) |
429 | virtqueue_notify(vq->vq); |
430 | return err; |
431 | } |
432 | |
433 | static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) |
434 | { |
435 | struct virtio_scsi *vscsi = shost_priv(sh); |
436 | struct virtio_scsi_target_state *tgt = vscsi->tgt[sc->device->id]; |
437 | struct virtio_scsi_cmd *cmd; |
438 | int ret; |
439 | |
440 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
441 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
442 | |
443 | /* TODO: check feature bit and fail if unsupported? */ |
444 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); |
445 | |
446 | dev_dbg(&sc->device->sdev_gendev, |
447 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); |
448 | |
449 | ret = SCSI_MLQUEUE_HOST_BUSY; |
450 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_ATOMIC); |
451 | if (!cmd) |
452 | goto out; |
453 | |
454 | memset(cmd, 0, sizeof(*cmd)); |
455 | cmd->sc = sc; |
456 | cmd->req.cmd = (struct virtio_scsi_cmd_req){ |
457 | .lun[0] = 1, |
458 | .lun[1] = sc->device->id, |
459 | .lun[2] = (sc->device->lun >> 8) | 0x40, |
460 | .lun[3] = sc->device->lun & 0xff, |
461 | .tag = (unsigned long)sc, |
462 | .task_attr = VIRTIO_SCSI_S_SIMPLE, |
463 | .prio = 0, |
464 | .crn = 0, |
465 | }; |
466 | |
467 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); |
468 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); |
469 | |
470 | if (virtscsi_kick_cmd(tgt, &vscsi->req_vq, cmd, |
471 | sizeof cmd->req.cmd, sizeof cmd->resp.cmd, |
472 | GFP_ATOMIC) == 0) |
473 | ret = 0; |
474 | else |
475 | mempool_free(cmd, virtscsi_cmd_pool); |
476 | |
477 | out: |
478 | return ret; |
479 | } |
480 | |
481 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) |
482 | { |
483 | DECLARE_COMPLETION_ONSTACK(comp); |
484 | struct virtio_scsi_target_state *tgt = vscsi->tgt[cmd->sc->device->id]; |
485 | int ret = FAILED; |
486 | |
487 | cmd->comp = ∁ |
488 | if (virtscsi_kick_cmd(tgt, &vscsi->ctrl_vq, cmd, |
489 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf, |
490 | GFP_NOIO) < 0) |
491 | goto out; |
492 | |
493 | wait_for_completion(&comp); |
494 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
495 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) |
496 | ret = SUCCESS; |
497 | |
498 | out: |
499 | mempool_free(cmd, virtscsi_cmd_pool); |
500 | return ret; |
501 | } |
502 | |
503 | static int virtscsi_device_reset(struct scsi_cmnd *sc) |
504 | { |
505 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); |
506 | struct virtio_scsi_cmd *cmd; |
507 | |
508 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); |
509 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); |
510 | if (!cmd) |
511 | return FAILED; |
512 | |
513 | memset(cmd, 0, sizeof(*cmd)); |
514 | cmd->sc = sc; |
515 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
516 | .type = VIRTIO_SCSI_T_TMF, |
517 | .subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET, |
518 | .lun[0] = 1, |
519 | .lun[1] = sc->device->id, |
520 | .lun[2] = (sc->device->lun >> 8) | 0x40, |
521 | .lun[3] = sc->device->lun & 0xff, |
522 | }; |
523 | return virtscsi_tmf(vscsi, cmd); |
524 | } |
525 | |
526 | static int virtscsi_abort(struct scsi_cmnd *sc) |
527 | { |
528 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); |
529 | struct virtio_scsi_cmd *cmd; |
530 | |
531 | scmd_printk(KERN_INFO, sc, "abort\n"); |
532 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); |
533 | if (!cmd) |
534 | return FAILED; |
535 | |
536 | memset(cmd, 0, sizeof(*cmd)); |
537 | cmd->sc = sc; |
538 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
539 | .type = VIRTIO_SCSI_T_TMF, |
540 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, |
541 | .lun[0] = 1, |
542 | .lun[1] = sc->device->id, |
543 | .lun[2] = (sc->device->lun >> 8) | 0x40, |
544 | .lun[3] = sc->device->lun & 0xff, |
545 | .tag = (unsigned long)sc, |
546 | }; |
547 | return virtscsi_tmf(vscsi, cmd); |
548 | } |
549 | |
550 | static struct scsi_host_template virtscsi_host_template = { |
551 | .module = THIS_MODULE, |
552 | .name = "Virtio SCSI HBA", |
553 | .proc_name = "virtio_scsi", |
554 | .queuecommand = virtscsi_queuecommand, |
555 | .this_id = -1, |
556 | .eh_abort_handler = virtscsi_abort, |
557 | .eh_device_reset_handler = virtscsi_device_reset, |
558 | |
559 | .can_queue = 1024, |
560 | .dma_boundary = UINT_MAX, |
561 | .use_clustering = ENABLE_CLUSTERING, |
562 | }; |
563 | |
564 | #define virtscsi_config_get(vdev, fld) \ |
565 | ({ \ |
566 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ |
567 | vdev->config->get(vdev, \ |
568 | offsetof(struct virtio_scsi_config, fld), \ |
569 | &__val, sizeof(__val)); \ |
570 | __val; \ |
571 | }) |
572 | |
573 | #define virtscsi_config_set(vdev, fld, val) \ |
574 | (void)({ \ |
575 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ |
576 | vdev->config->set(vdev, \ |
577 | offsetof(struct virtio_scsi_config, fld), \ |
578 | &__val, sizeof(__val)); \ |
579 | }) |
580 | |
581 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
582 | struct virtqueue *vq) |
583 | { |
584 | spin_lock_init(&virtscsi_vq->vq_lock); |
585 | virtscsi_vq->vq = vq; |
586 | } |
587 | |
588 | static struct virtio_scsi_target_state *virtscsi_alloc_tgt( |
589 | struct virtio_device *vdev, int sg_elems) |
590 | { |
591 | struct virtio_scsi_target_state *tgt; |
592 | gfp_t gfp_mask = GFP_KERNEL; |
593 | |
594 | /* We need extra sg elements at head and tail. */ |
595 | tgt = kmalloc(sizeof(*tgt) + sizeof(tgt->sg[0]) * (sg_elems + 2), |
596 | gfp_mask); |
597 | |
598 | if (!tgt) |
599 | return NULL; |
600 | |
601 | spin_lock_init(&tgt->tgt_lock); |
602 | sg_init_table(tgt->sg, sg_elems + 2); |
603 | return tgt; |
604 | } |
605 | |
606 | static void virtscsi_scan(struct virtio_device *vdev) |
607 | { |
608 | struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv; |
609 | |
610 | scsi_scan_host(shost); |
611 | } |
612 | |
613 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
614 | { |
615 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
616 | struct virtio_scsi *vscsi = shost_priv(sh); |
617 | u32 i, num_targets; |
618 | |
619 | /* Stop all the virtqueues. */ |
620 | vdev->config->reset(vdev); |
621 | |
622 | num_targets = sh->max_id; |
623 | for (i = 0; i < num_targets; i++) { |
624 | kfree(vscsi->tgt[i]); |
625 | vscsi->tgt[i] = NULL; |
626 | } |
627 | |
628 | vdev->config->del_vqs(vdev); |
629 | } |
630 | |
631 | static int virtscsi_init(struct virtio_device *vdev, |
632 | struct virtio_scsi *vscsi, int num_targets) |
633 | { |
634 | int err; |
635 | struct virtqueue *vqs[3]; |
636 | u32 i, sg_elems; |
637 | |
638 | vq_callback_t *callbacks[] = { |
639 | virtscsi_ctrl_done, |
640 | virtscsi_event_done, |
641 | virtscsi_req_done |
642 | }; |
643 | const char *names[] = { |
644 | "control", |
645 | "event", |
646 | "request" |
647 | }; |
648 | |
649 | /* Discover virtqueues and write information to configuration. */ |
650 | err = vdev->config->find_vqs(vdev, 3, vqs, callbacks, names); |
651 | if (err) |
652 | return err; |
653 | |
654 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
655 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); |
656 | virtscsi_init_vq(&vscsi->req_vq, vqs[2]); |
657 | |
658 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); |
659 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); |
660 | |
661 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
662 | virtscsi_kick_event_all(vscsi); |
663 | |
664 | /* We need to know how many segments before we allocate. */ |
665 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
666 | |
667 | for (i = 0; i < num_targets; i++) { |
668 | vscsi->tgt[i] = virtscsi_alloc_tgt(vdev, sg_elems); |
669 | if (!vscsi->tgt[i]) { |
670 | err = -ENOMEM; |
671 | goto out; |
672 | } |
673 | } |
674 | err = 0; |
675 | |
676 | out: |
677 | if (err) |
678 | virtscsi_remove_vqs(vdev); |
679 | return err; |
680 | } |
681 | |
682 | static int virtscsi_probe(struct virtio_device *vdev) |
683 | { |
684 | struct Scsi_Host *shost; |
685 | struct virtio_scsi *vscsi; |
686 | int err; |
687 | u32 sg_elems, num_targets; |
688 | u32 cmd_per_lun; |
689 | |
690 | /* Allocate memory and link the structs together. */ |
691 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
692 | shost = scsi_host_alloc(&virtscsi_host_template, |
693 | sizeof(*vscsi) |
694 | + num_targets * sizeof(struct virtio_scsi_target_state)); |
695 | |
696 | if (!shost) |
697 | return -ENOMEM; |
698 | |
699 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
700 | shost->sg_tablesize = sg_elems; |
701 | vscsi = shost_priv(shost); |
702 | vscsi->vdev = vdev; |
703 | vdev->priv = shost; |
704 | |
705 | err = virtscsi_init(vdev, vscsi, num_targets); |
706 | if (err) |
707 | goto virtscsi_init_failed; |
708 | |
709 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
710 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); |
711 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; |
712 | |
713 | /* LUNs > 256 are reported with format 1, so they go in the range |
714 | * 16640-32767. |
715 | */ |
716 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; |
717 | shost->max_id = num_targets; |
718 | shost->max_channel = 0; |
719 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; |
720 | err = scsi_add_host(shost, &vdev->dev); |
721 | if (err) |
722 | goto scsi_add_host_failed; |
723 | /* |
724 | * scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan() |
725 | * after VIRTIO_CONFIG_S_DRIVER_OK has been set.. |
726 | */ |
727 | return 0; |
728 | |
729 | scsi_add_host_failed: |
730 | vdev->config->del_vqs(vdev); |
731 | virtscsi_init_failed: |
732 | scsi_host_put(shost); |
733 | return err; |
734 | } |
735 | |
736 | static void virtscsi_remove(struct virtio_device *vdev) |
737 | { |
738 | struct Scsi_Host *shost = virtio_scsi_host(vdev); |
739 | struct virtio_scsi *vscsi = shost_priv(shost); |
740 | |
741 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
742 | virtscsi_cancel_event_work(vscsi); |
743 | |
744 | scsi_remove_host(shost); |
745 | |
746 | virtscsi_remove_vqs(vdev); |
747 | scsi_host_put(shost); |
748 | } |
749 | |
750 | #ifdef CONFIG_PM |
751 | static int virtscsi_freeze(struct virtio_device *vdev) |
752 | { |
753 | virtscsi_remove_vqs(vdev); |
754 | return 0; |
755 | } |
756 | |
757 | static int virtscsi_restore(struct virtio_device *vdev) |
758 | { |
759 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
760 | struct virtio_scsi *vscsi = shost_priv(sh); |
761 | |
762 | return virtscsi_init(vdev, vscsi, sh->max_id); |
763 | } |
764 | #endif |
765 | |
766 | static struct virtio_device_id id_table[] = { |
767 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, |
768 | { 0 }, |
769 | }; |
770 | |
771 | static unsigned int features[] = { |
772 | VIRTIO_SCSI_F_HOTPLUG, |
773 | VIRTIO_SCSI_F_CHANGE, |
774 | }; |
775 | |
776 | static struct virtio_driver virtio_scsi_driver = { |
777 | .feature_table = features, |
778 | .feature_table_size = ARRAY_SIZE(features), |
779 | .driver.name = KBUILD_MODNAME, |
780 | .driver.owner = THIS_MODULE, |
781 | .id_table = id_table, |
782 | .probe = virtscsi_probe, |
783 | .scan = virtscsi_scan, |
784 | #ifdef CONFIG_PM |
785 | .freeze = virtscsi_freeze, |
786 | .restore = virtscsi_restore, |
787 | #endif |
788 | .remove = virtscsi_remove, |
789 | }; |
790 | |
791 | static int __init init(void) |
792 | { |
793 | int ret = -ENOMEM; |
794 | |
795 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); |
796 | if (!virtscsi_cmd_cache) { |
797 | printk(KERN_ERR "kmem_cache_create() for " |
798 | "virtscsi_cmd_cache failed\n"); |
799 | goto error; |
800 | } |
801 | |
802 | |
803 | virtscsi_cmd_pool = |
804 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, |
805 | virtscsi_cmd_cache); |
806 | if (!virtscsi_cmd_pool) { |
807 | printk(KERN_ERR "mempool_create() for" |
808 | "virtscsi_cmd_pool failed\n"); |
809 | goto error; |
810 | } |
811 | ret = register_virtio_driver(&virtio_scsi_driver); |
812 | if (ret < 0) |
813 | goto error; |
814 | |
815 | return 0; |
816 | |
817 | error: |
818 | if (virtscsi_cmd_pool) { |
819 | mempool_destroy(virtscsi_cmd_pool); |
820 | virtscsi_cmd_pool = NULL; |
821 | } |
822 | if (virtscsi_cmd_cache) { |
823 | kmem_cache_destroy(virtscsi_cmd_cache); |
824 | virtscsi_cmd_cache = NULL; |
825 | } |
826 | return ret; |
827 | } |
828 | |
829 | static void __exit fini(void) |
830 | { |
831 | unregister_virtio_driver(&virtio_scsi_driver); |
832 | mempool_destroy(virtscsi_cmd_pool); |
833 | kmem_cache_destroy(virtscsi_cmd_cache); |
834 | } |
835 | module_init(init); |
836 | module_exit(fini); |
837 | |
838 | MODULE_DEVICE_TABLE(virtio, id_table); |
839 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); |
840 | MODULE_LICENSE("GPL"); |
841 |
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