Commit | Line | Data |
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4fe74b1c PB |
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 | |
365a7150 | 28 | #define VIRTIO_SCSI_EVENT_LEN 8 |
4fe74b1c PB |
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 | ||
365a7150 CM |
47 | struct virtio_scsi_event_node { |
48 | struct virtio_scsi *vscsi; | |
49 | struct virtio_scsi_event event; | |
50 | struct work_struct work; | |
51 | }; | |
52 | ||
139fe45a PB |
53 | struct virtio_scsi_vq { |
54 | /* Protects vq */ | |
55 | spinlock_t vq_lock; | |
56 | ||
57 | struct virtqueue *vq; | |
58 | }; | |
59 | ||
2bd37f0f PB |
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 | ||
4fe74b1c PB |
69 | /* Driver instance state */ |
70 | struct virtio_scsi { | |
4fe74b1c | 71 | struct virtio_device *vdev; |
2bd37f0f | 72 | |
139fe45a PB |
73 | struct virtio_scsi_vq ctrl_vq; |
74 | struct virtio_scsi_vq event_vq; | |
75 | struct virtio_scsi_vq req_vq; | |
4fe74b1c | 76 | |
365a7150 CM |
77 | /* Get some buffers ready for event vq */ |
78 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
79 | ||
2bd37f0f | 80 | struct virtio_scsi_target_state *tgt[]; |
4fe74b1c PB |
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 | { | |
4fe74b1c | 173 | void *buf; |
4fe74b1c PB |
174 | unsigned int len; |
175 | ||
4fe74b1c PB |
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)); | |
4fe74b1c PB |
181 | } |
182 | ||
183 | static void virtscsi_req_done(struct virtqueue *vq) | |
184 | { | |
139fe45a PB |
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); | |
4fe74b1c | 190 | virtscsi_vq_done(vq, virtscsi_complete_cmd); |
139fe45a | 191 | spin_unlock_irqrestore(&vscsi->req_vq.vq_lock, flags); |
4fe74b1c PB |
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); | |
e4594bb5 PB |
200 | else |
201 | mempool_free(cmd, virtscsi_cmd_pool); | |
4fe74b1c PB |
202 | } |
203 | ||
204 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
205 | { | |
139fe45a PB |
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); | |
4fe74b1c | 211 | virtscsi_vq_done(vq, virtscsi_complete_free); |
139fe45a | 212 | spin_unlock_irqrestore(&vscsi->ctrl_vq.vq_lock, flags); |
4fe74b1c PB |
213 | }; |
214 | ||
365a7150 CM |
215 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
216 | struct virtio_scsi_event_node *event_node) | |
217 | { | |
4614e51c | 218 | int err; |
365a7150 CM |
219 | struct scatterlist sg; |
220 | unsigned long flags; | |
221 | ||
2e9c9dfd | 222 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
223 | |
224 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
225 | ||
4614e51c RR |
226 | err = virtqueue_add_buf(vscsi->event_vq.vq, &sg, 0, 1, event_node, |
227 | GFP_ATOMIC); | |
228 | if (!err) | |
365a7150 CM |
229 | virtqueue_kick(vscsi->event_vq.vq); |
230 | ||
231 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
232 | ||
4614e51c | 233 | return err; |
365a7150 CM |
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 | ||
865b58c0 PB |
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 | ||
365a7150 CM |
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; | |
865b58c0 PB |
326 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
327 | virtscsi_handle_param_change(vscsi, event); | |
328 | break; | |
365a7150 CM |
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 | ||
4fe74b1c PB |
343 | static void virtscsi_event_done(struct virtqueue *vq) |
344 | { | |
139fe45a PB |
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); | |
365a7150 | 350 | virtscsi_vq_done(vq, virtscsi_complete_event); |
139fe45a | 351 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); |
4fe74b1c PB |
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) | |
27e99ade | 363 | sg[idx++] = *sg_elem; |
4fe74b1c PB |
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 | * | |
2bd37f0f | 377 | * Called with tgt_lock held. |
4fe74b1c | 378 | */ |
2bd37f0f | 379 | static void virtscsi_map_cmd(struct virtio_scsi_target_state *tgt, |
4fe74b1c PB |
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; | |
2bd37f0f | 385 | struct scatterlist *sg = tgt->sg; |
4fe74b1c PB |
386 | unsigned int idx = 0; |
387 | ||
4fe74b1c PB |
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 | ||
2bd37f0f PB |
407 | static int virtscsi_kick_cmd(struct virtio_scsi_target_state *tgt, |
408 | struct virtio_scsi_vq *vq, | |
4fe74b1c PB |
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; | |
4614e51c RR |
414 | int err; |
415 | bool needs_kick = false; | |
4fe74b1c | 416 | |
2bd37f0f PB |
417 | spin_lock_irqsave(&tgt->tgt_lock, flags); |
418 | virtscsi_map_cmd(tgt, cmd, &out_num, &in_num, req_size, resp_size); | |
4fe74b1c | 419 | |
139fe45a | 420 | spin_lock(&vq->vq_lock); |
4614e51c | 421 | err = virtqueue_add_buf(vq->vq, tgt->sg, out_num, in_num, cmd, gfp); |
2bd37f0f | 422 | spin_unlock(&tgt->tgt_lock); |
4614e51c RR |
423 | if (!err) |
424 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 425 | |
bce750b1 | 426 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 427 | |
4614e51c | 428 | if (needs_kick) |
139fe45a | 429 | virtqueue_notify(vq->vq); |
4614e51c | 430 | return err; |
4fe74b1c PB |
431 | } |
432 | ||
433 | static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) | |
434 | { | |
435 | struct virtio_scsi *vscsi = shost_priv(sh); | |
2bd37f0f | 436 | struct virtio_scsi_target_state *tgt = vscsi->tgt[sc->device->id]; |
4fe74b1c PB |
437 | struct virtio_scsi_cmd *cmd; |
438 | int ret; | |
439 | ||
2bd37f0f PB |
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 | ||
4fe74b1c PB |
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 | ||
2bd37f0f | 470 | if (virtscsi_kick_cmd(tgt, &vscsi->req_vq, cmd, |
4fe74b1c | 471 | sizeof cmd->req.cmd, sizeof cmd->resp.cmd, |
4614e51c | 472 | GFP_ATOMIC) == 0) |
4fe74b1c | 473 | ret = 0; |
b56d1003 EN |
474 | else |
475 | mempool_free(cmd, virtscsi_cmd_pool); | |
4fe74b1c PB |
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); | |
2bd37f0f | 484 | struct virtio_scsi_target_state *tgt = vscsi->tgt[cmd->sc->device->id]; |
e4594bb5 | 485 | int ret = FAILED; |
4fe74b1c PB |
486 | |
487 | cmd->comp = ∁ | |
2bd37f0f | 488 | if (virtscsi_kick_cmd(tgt, &vscsi->ctrl_vq, cmd, |
e4594bb5 PB |
489 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf, |
490 | GFP_NOIO) < 0) | |
491 | goto out; | |
4fe74b1c PB |
492 | |
493 | wait_for_completion(&comp); | |
e4594bb5 PB |
494 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
495 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
496 | ret = SUCCESS; | |
4fe74b1c | 497 | |
e4594bb5 PB |
498 | out: |
499 | mempool_free(cmd, virtscsi_cmd_pool); | |
500 | return ret; | |
4fe74b1c PB |
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 | ||
139fe45a PB |
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 | ||
2bd37f0f PB |
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 | ||
59057fbc NB |
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 | ||
2bd37f0f PB |
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 | ||
4fe74b1c | 631 | static int virtscsi_init(struct virtio_device *vdev, |
2bd37f0f | 632 | struct virtio_scsi *vscsi, int num_targets) |
4fe74b1c PB |
633 | { |
634 | int err; | |
635 | struct virtqueue *vqs[3]; | |
2bd37f0f PB |
636 | u32 i, sg_elems; |
637 | ||
4fe74b1c PB |
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 | ||
139fe45a PB |
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]); | |
4fe74b1c PB |
657 | |
658 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); | |
659 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 660 | |
365a7150 CM |
661 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
662 | virtscsi_kick_event_all(vscsi); | |
663 | ||
2bd37f0f PB |
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; | |
4fe74b1c PB |
680 | } |
681 | ||
6f039790 | 682 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
683 | { |
684 | struct Scsi_Host *shost; | |
685 | struct virtio_scsi *vscsi; | |
686 | int err; | |
2bd37f0f | 687 | u32 sg_elems, num_targets; |
4fe74b1c PB |
688 | u32 cmd_per_lun; |
689 | ||
4fe74b1c | 690 | /* Allocate memory and link the structs together. */ |
2bd37f0f | 691 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 692 | shost = scsi_host_alloc(&virtscsi_host_template, |
2bd37f0f PB |
693 | sizeof(*vscsi) |
694 | + num_targets * sizeof(struct virtio_scsi_target_state)); | |
4fe74b1c PB |
695 | |
696 | if (!shost) | |
697 | return -ENOMEM; | |
698 | ||
2bd37f0f | 699 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
700 | shost->sg_tablesize = sg_elems; |
701 | vscsi = shost_priv(shost); | |
702 | vscsi->vdev = vdev; | |
703 | vdev->priv = shost; | |
704 | ||
2bd37f0f | 705 | err = virtscsi_init(vdev, vscsi, num_targets); |
4fe74b1c PB |
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; | |
9da5f5ac PB |
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; | |
2bd37f0f | 717 | shost->max_id = num_targets; |
4fe74b1c PB |
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; | |
59057fbc NB |
723 | /* |
724 | * scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan() | |
725 | * after VIRTIO_CONFIG_S_DRIVER_OK has been set.. | |
726 | */ | |
4fe74b1c PB |
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 | ||
6f039790 | 736 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
737 | { |
738 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
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); | |
4fe74b1c PB |
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 | ||
2bd37f0f | 762 | return virtscsi_init(vdev, vscsi, sh->max_id); |
4fe74b1c PB |
763 | } |
764 | #endif | |
765 | ||
766 | static struct virtio_device_id id_table[] = { | |
767 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
768 | { 0 }, | |
769 | }; | |
770 | ||
365a7150 | 771 | static unsigned int features[] = { |
865b58c0 PB |
772 | VIRTIO_SCSI_F_HOTPLUG, |
773 | VIRTIO_SCSI_F_CHANGE, | |
365a7150 CM |
774 | }; |
775 | ||
4fe74b1c | 776 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
777 | .feature_table = features, |
778 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
779 | .driver.name = KBUILD_MODNAME, |
780 | .driver.owner = THIS_MODULE, | |
781 | .id_table = id_table, | |
782 | .probe = virtscsi_probe, | |
59057fbc | 783 | .scan = virtscsi_scan, |
4fe74b1c PB |
784 | #ifdef CONFIG_PM |
785 | .freeze = virtscsi_freeze, | |
786 | .restore = virtscsi_restore, | |
787 | #endif | |
6f039790 | 788 | .remove = virtscsi_remove, |
4fe74b1c PB |
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"); |