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 | ||
ba06d1e1 WG |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | ||
4fe74b1c PB |
18 | #include <linux/module.h> |
19 | #include <linux/slab.h> | |
20 | #include <linux/mempool.h> | |
21 | #include <linux/virtio.h> | |
22 | #include <linux/virtio_ids.h> | |
23 | #include <linux/virtio_config.h> | |
24 | #include <linux/virtio_scsi.h> | |
25 | #include <scsi/scsi_host.h> | |
26 | #include <scsi/scsi_device.h> | |
27 | #include <scsi/scsi_cmnd.h> | |
28 | ||
29 | #define VIRTIO_SCSI_MEMPOOL_SZ 64 | |
365a7150 | 30 | #define VIRTIO_SCSI_EVENT_LEN 8 |
4fe74b1c PB |
31 | |
32 | /* Command queue element */ | |
33 | struct virtio_scsi_cmd { | |
34 | struct scsi_cmnd *sc; | |
35 | struct completion *comp; | |
36 | union { | |
37 | struct virtio_scsi_cmd_req cmd; | |
38 | struct virtio_scsi_ctrl_tmf_req tmf; | |
39 | struct virtio_scsi_ctrl_an_req an; | |
40 | } req; | |
41 | union { | |
42 | struct virtio_scsi_cmd_resp cmd; | |
43 | struct virtio_scsi_ctrl_tmf_resp tmf; | |
44 | struct virtio_scsi_ctrl_an_resp an; | |
45 | struct virtio_scsi_event evt; | |
46 | } resp; | |
47 | } ____cacheline_aligned_in_smp; | |
48 | ||
365a7150 CM |
49 | struct virtio_scsi_event_node { |
50 | struct virtio_scsi *vscsi; | |
51 | struct virtio_scsi_event event; | |
52 | struct work_struct work; | |
53 | }; | |
54 | ||
139fe45a PB |
55 | struct virtio_scsi_vq { |
56 | /* Protects vq */ | |
57 | spinlock_t vq_lock; | |
58 | ||
59 | struct virtqueue *vq; | |
60 | }; | |
61 | ||
2bd37f0f PB |
62 | /* Per-target queue state */ |
63 | struct virtio_scsi_target_state { | |
64 | /* Protects sg. Lock hierarchy is tgt_lock -> vq_lock. */ | |
65 | spinlock_t tgt_lock; | |
66 | ||
67 | /* For sglist construction when adding commands to the virtqueue. */ | |
68 | struct scatterlist sg[]; | |
69 | }; | |
70 | ||
4fe74b1c PB |
71 | /* Driver instance state */ |
72 | struct virtio_scsi { | |
4fe74b1c | 73 | struct virtio_device *vdev; |
2bd37f0f | 74 | |
139fe45a PB |
75 | struct virtio_scsi_vq ctrl_vq; |
76 | struct virtio_scsi_vq event_vq; | |
77 | struct virtio_scsi_vq req_vq; | |
4fe74b1c | 78 | |
365a7150 CM |
79 | /* Get some buffers ready for event vq */ |
80 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
81 | ||
2bd37f0f | 82 | struct virtio_scsi_target_state *tgt[]; |
4fe74b1c PB |
83 | }; |
84 | ||
85 | static struct kmem_cache *virtscsi_cmd_cache; | |
86 | static mempool_t *virtscsi_cmd_pool; | |
87 | ||
88 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
89 | { | |
90 | return vdev->priv; | |
91 | } | |
92 | ||
93 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
94 | { | |
95 | if (!resid) | |
96 | return; | |
97 | ||
98 | if (!scsi_bidi_cmnd(sc)) { | |
99 | scsi_set_resid(sc, resid); | |
100 | return; | |
101 | } | |
102 | ||
103 | scsi_in(sc)->resid = min(resid, scsi_in(sc)->length); | |
104 | scsi_out(sc)->resid = resid - scsi_in(sc)->resid; | |
105 | } | |
106 | ||
107 | /** | |
108 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
109 | * | |
110 | * Called with vq_lock held. | |
111 | */ | |
112 | static void virtscsi_complete_cmd(void *buf) | |
113 | { | |
114 | struct virtio_scsi_cmd *cmd = buf; | |
115 | struct scsi_cmnd *sc = cmd->sc; | |
116 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
117 | ||
118 | dev_dbg(&sc->device->sdev_gendev, | |
119 | "cmd %p response %u status %#02x sense_len %u\n", | |
120 | sc, resp->response, resp->status, resp->sense_len); | |
121 | ||
122 | sc->result = resp->status; | |
123 | virtscsi_compute_resid(sc, resp->resid); | |
124 | switch (resp->response) { | |
125 | case VIRTIO_SCSI_S_OK: | |
126 | set_host_byte(sc, DID_OK); | |
127 | break; | |
128 | case VIRTIO_SCSI_S_OVERRUN: | |
129 | set_host_byte(sc, DID_ERROR); | |
130 | break; | |
131 | case VIRTIO_SCSI_S_ABORTED: | |
132 | set_host_byte(sc, DID_ABORT); | |
133 | break; | |
134 | case VIRTIO_SCSI_S_BAD_TARGET: | |
135 | set_host_byte(sc, DID_BAD_TARGET); | |
136 | break; | |
137 | case VIRTIO_SCSI_S_RESET: | |
138 | set_host_byte(sc, DID_RESET); | |
139 | break; | |
140 | case VIRTIO_SCSI_S_BUSY: | |
141 | set_host_byte(sc, DID_BUS_BUSY); | |
142 | break; | |
143 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
144 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
145 | break; | |
146 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
147 | set_host_byte(sc, DID_TARGET_FAILURE); | |
148 | break; | |
149 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
150 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
151 | break; | |
152 | default: | |
153 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
154 | resp->response); | |
155 | /* fall through */ | |
156 | case VIRTIO_SCSI_S_FAILURE: | |
157 | set_host_byte(sc, DID_ERROR); | |
158 | break; | |
159 | } | |
160 | ||
161 | WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE); | |
162 | if (sc->sense_buffer) { | |
163 | memcpy(sc->sense_buffer, resp->sense, | |
164 | min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE)); | |
165 | if (resp->sense_len) | |
166 | set_driver_byte(sc, DRIVER_SENSE); | |
167 | } | |
168 | ||
169 | mempool_free(cmd, virtscsi_cmd_pool); | |
170 | sc->scsi_done(sc); | |
171 | } | |
172 | ||
173 | static void virtscsi_vq_done(struct virtqueue *vq, void (*fn)(void *buf)) | |
174 | { | |
4fe74b1c | 175 | void *buf; |
4fe74b1c PB |
176 | unsigned int len; |
177 | ||
4fe74b1c PB |
178 | do { |
179 | virtqueue_disable_cb(vq); | |
180 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
181 | fn(buf); | |
182 | } while (!virtqueue_enable_cb(vq)); | |
4fe74b1c PB |
183 | } |
184 | ||
185 | static void virtscsi_req_done(struct virtqueue *vq) | |
186 | { | |
139fe45a PB |
187 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
188 | struct virtio_scsi *vscsi = shost_priv(sh); | |
189 | unsigned long flags; | |
190 | ||
191 | spin_lock_irqsave(&vscsi->req_vq.vq_lock, flags); | |
4fe74b1c | 192 | virtscsi_vq_done(vq, virtscsi_complete_cmd); |
139fe45a | 193 | spin_unlock_irqrestore(&vscsi->req_vq.vq_lock, flags); |
4fe74b1c PB |
194 | }; |
195 | ||
196 | static void virtscsi_complete_free(void *buf) | |
197 | { | |
198 | struct virtio_scsi_cmd *cmd = buf; | |
199 | ||
200 | if (cmd->comp) | |
201 | complete_all(cmd->comp); | |
e4594bb5 PB |
202 | else |
203 | mempool_free(cmd, virtscsi_cmd_pool); | |
4fe74b1c PB |
204 | } |
205 | ||
206 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
207 | { | |
139fe45a PB |
208 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
209 | struct virtio_scsi *vscsi = shost_priv(sh); | |
210 | unsigned long flags; | |
211 | ||
212 | spin_lock_irqsave(&vscsi->ctrl_vq.vq_lock, flags); | |
4fe74b1c | 213 | virtscsi_vq_done(vq, virtscsi_complete_free); |
139fe45a | 214 | spin_unlock_irqrestore(&vscsi->ctrl_vq.vq_lock, flags); |
4fe74b1c PB |
215 | }; |
216 | ||
365a7150 CM |
217 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
218 | struct virtio_scsi_event_node *event_node) | |
219 | { | |
4614e51c | 220 | int err; |
365a7150 CM |
221 | struct scatterlist sg; |
222 | unsigned long flags; | |
223 | ||
2e9c9dfd | 224 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
225 | |
226 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
227 | ||
4614e51c RR |
228 | err = virtqueue_add_buf(vscsi->event_vq.vq, &sg, 0, 1, event_node, |
229 | GFP_ATOMIC); | |
230 | if (!err) | |
365a7150 CM |
231 | virtqueue_kick(vscsi->event_vq.vq); |
232 | ||
233 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
234 | ||
4614e51c | 235 | return err; |
365a7150 CM |
236 | } |
237 | ||
238 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
239 | { | |
240 | int i; | |
241 | ||
242 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
243 | vscsi->event_list[i].vscsi = vscsi; | |
244 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
245 | } | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
251 | { | |
252 | int i; | |
253 | ||
254 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) | |
255 | cancel_work_sync(&vscsi->event_list[i].work); | |
256 | } | |
257 | ||
258 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
259 | struct virtio_scsi_event *event) | |
260 | { | |
261 | struct scsi_device *sdev; | |
262 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
263 | unsigned int target = event->lun[1]; | |
264 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
265 | ||
266 | switch (event->reason) { | |
267 | case VIRTIO_SCSI_EVT_RESET_RESCAN: | |
268 | scsi_add_device(shost, 0, target, lun); | |
269 | break; | |
270 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
271 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
272 | if (sdev) { | |
273 | scsi_remove_device(sdev); | |
274 | scsi_device_put(sdev); | |
275 | } else { | |
276 | pr_err("SCSI device %d 0 %d %d not found\n", | |
277 | shost->host_no, target, lun); | |
278 | } | |
279 | break; | |
280 | default: | |
281 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
282 | } | |
283 | } | |
284 | ||
865b58c0 PB |
285 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
286 | struct virtio_scsi_event *event) | |
287 | { | |
288 | struct scsi_device *sdev; | |
289 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
290 | unsigned int target = event->lun[1]; | |
291 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
292 | u8 asc = event->reason & 255; | |
293 | u8 ascq = event->reason >> 8; | |
294 | ||
295 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
296 | if (!sdev) { | |
297 | pr_err("SCSI device %d 0 %d %d not found\n", | |
298 | shost->host_no, target, lun); | |
299 | return; | |
300 | } | |
301 | ||
302 | /* Handle "Parameters changed", "Mode parameters changed", and | |
303 | "Capacity data has changed". */ | |
304 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
305 | scsi_rescan_device(&sdev->sdev_gendev); | |
306 | ||
307 | scsi_device_put(sdev); | |
308 | } | |
309 | ||
365a7150 CM |
310 | static void virtscsi_handle_event(struct work_struct *work) |
311 | { | |
312 | struct virtio_scsi_event_node *event_node = | |
313 | container_of(work, struct virtio_scsi_event_node, work); | |
314 | struct virtio_scsi *vscsi = event_node->vscsi; | |
315 | struct virtio_scsi_event *event = &event_node->event; | |
316 | ||
317 | if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) { | |
318 | event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED; | |
319 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); | |
320 | } | |
321 | ||
322 | switch (event->event) { | |
323 | case VIRTIO_SCSI_T_NO_EVENT: | |
324 | break; | |
325 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
326 | virtscsi_handle_transport_reset(vscsi, event); | |
327 | break; | |
865b58c0 PB |
328 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
329 | virtscsi_handle_param_change(vscsi, event); | |
330 | break; | |
365a7150 CM |
331 | default: |
332 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
333 | } | |
334 | virtscsi_kick_event(vscsi, event_node); | |
335 | } | |
336 | ||
337 | static void virtscsi_complete_event(void *buf) | |
338 | { | |
339 | struct virtio_scsi_event_node *event_node = buf; | |
340 | ||
341 | INIT_WORK(&event_node->work, virtscsi_handle_event); | |
342 | schedule_work(&event_node->work); | |
343 | } | |
344 | ||
4fe74b1c PB |
345 | static void virtscsi_event_done(struct virtqueue *vq) |
346 | { | |
139fe45a PB |
347 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
348 | struct virtio_scsi *vscsi = shost_priv(sh); | |
349 | unsigned long flags; | |
350 | ||
351 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
365a7150 | 352 | virtscsi_vq_done(vq, virtscsi_complete_event); |
139fe45a | 353 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); |
4fe74b1c PB |
354 | }; |
355 | ||
356 | static void virtscsi_map_sgl(struct scatterlist *sg, unsigned int *p_idx, | |
357 | struct scsi_data_buffer *sdb) | |
358 | { | |
359 | struct sg_table *table = &sdb->table; | |
360 | struct scatterlist *sg_elem; | |
361 | unsigned int idx = *p_idx; | |
362 | int i; | |
363 | ||
364 | for_each_sg(table->sgl, sg_elem, table->nents, i) | |
27e99ade | 365 | sg[idx++] = *sg_elem; |
4fe74b1c PB |
366 | |
367 | *p_idx = idx; | |
368 | } | |
369 | ||
370 | /** | |
371 | * virtscsi_map_cmd - map a scsi_cmd to a virtqueue scatterlist | |
372 | * @vscsi : virtio_scsi state | |
373 | * @cmd : command structure | |
374 | * @out_num : number of read-only elements | |
375 | * @in_num : number of write-only elements | |
376 | * @req_size : size of the request buffer | |
377 | * @resp_size : size of the response buffer | |
378 | * | |
2bd37f0f | 379 | * Called with tgt_lock held. |
4fe74b1c | 380 | */ |
2bd37f0f | 381 | static void virtscsi_map_cmd(struct virtio_scsi_target_state *tgt, |
4fe74b1c PB |
382 | struct virtio_scsi_cmd *cmd, |
383 | unsigned *out_num, unsigned *in_num, | |
384 | size_t req_size, size_t resp_size) | |
385 | { | |
386 | struct scsi_cmnd *sc = cmd->sc; | |
2bd37f0f | 387 | struct scatterlist *sg = tgt->sg; |
4fe74b1c PB |
388 | unsigned int idx = 0; |
389 | ||
4fe74b1c PB |
390 | /* Request header. */ |
391 | sg_set_buf(&sg[idx++], &cmd->req, req_size); | |
392 | ||
393 | /* Data-out buffer. */ | |
394 | if (sc && sc->sc_data_direction != DMA_FROM_DEVICE) | |
395 | virtscsi_map_sgl(sg, &idx, scsi_out(sc)); | |
396 | ||
397 | *out_num = idx; | |
398 | ||
399 | /* Response header. */ | |
400 | sg_set_buf(&sg[idx++], &cmd->resp, resp_size); | |
401 | ||
402 | /* Data-in buffer */ | |
403 | if (sc && sc->sc_data_direction != DMA_TO_DEVICE) | |
404 | virtscsi_map_sgl(sg, &idx, scsi_in(sc)); | |
405 | ||
406 | *in_num = idx - *out_num; | |
407 | } | |
408 | ||
2bd37f0f PB |
409 | static int virtscsi_kick_cmd(struct virtio_scsi_target_state *tgt, |
410 | struct virtio_scsi_vq *vq, | |
4fe74b1c PB |
411 | struct virtio_scsi_cmd *cmd, |
412 | size_t req_size, size_t resp_size, gfp_t gfp) | |
413 | { | |
414 | unsigned int out_num, in_num; | |
415 | unsigned long flags; | |
4614e51c RR |
416 | int err; |
417 | bool needs_kick = false; | |
4fe74b1c | 418 | |
2bd37f0f PB |
419 | spin_lock_irqsave(&tgt->tgt_lock, flags); |
420 | virtscsi_map_cmd(tgt, cmd, &out_num, &in_num, req_size, resp_size); | |
4fe74b1c | 421 | |
139fe45a | 422 | spin_lock(&vq->vq_lock); |
4614e51c | 423 | err = virtqueue_add_buf(vq->vq, tgt->sg, out_num, in_num, cmd, gfp); |
2bd37f0f | 424 | spin_unlock(&tgt->tgt_lock); |
4614e51c RR |
425 | if (!err) |
426 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 427 | |
bce750b1 | 428 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 429 | |
4614e51c | 430 | if (needs_kick) |
139fe45a | 431 | virtqueue_notify(vq->vq); |
4614e51c | 432 | return err; |
4fe74b1c PB |
433 | } |
434 | ||
435 | static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) | |
436 | { | |
437 | struct virtio_scsi *vscsi = shost_priv(sh); | |
2bd37f0f | 438 | struct virtio_scsi_target_state *tgt = vscsi->tgt[sc->device->id]; |
4fe74b1c PB |
439 | struct virtio_scsi_cmd *cmd; |
440 | int ret; | |
441 | ||
2bd37f0f PB |
442 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
443 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); | |
444 | ||
445 | /* TODO: check feature bit and fail if unsupported? */ | |
446 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
447 | ||
4fe74b1c PB |
448 | dev_dbg(&sc->device->sdev_gendev, |
449 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
450 | ||
451 | ret = SCSI_MLQUEUE_HOST_BUSY; | |
452 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_ATOMIC); | |
453 | if (!cmd) | |
454 | goto out; | |
455 | ||
456 | memset(cmd, 0, sizeof(*cmd)); | |
457 | cmd->sc = sc; | |
458 | cmd->req.cmd = (struct virtio_scsi_cmd_req){ | |
459 | .lun[0] = 1, | |
460 | .lun[1] = sc->device->id, | |
461 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
462 | .lun[3] = sc->device->lun & 0xff, | |
463 | .tag = (unsigned long)sc, | |
464 | .task_attr = VIRTIO_SCSI_S_SIMPLE, | |
465 | .prio = 0, | |
466 | .crn = 0, | |
467 | }; | |
468 | ||
469 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
470 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); | |
471 | ||
2bd37f0f | 472 | if (virtscsi_kick_cmd(tgt, &vscsi->req_vq, cmd, |
4fe74b1c | 473 | sizeof cmd->req.cmd, sizeof cmd->resp.cmd, |
4614e51c | 474 | GFP_ATOMIC) == 0) |
4fe74b1c | 475 | ret = 0; |
b56d1003 EN |
476 | else |
477 | mempool_free(cmd, virtscsi_cmd_pool); | |
4fe74b1c PB |
478 | |
479 | out: | |
480 | return ret; | |
481 | } | |
482 | ||
483 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) | |
484 | { | |
485 | DECLARE_COMPLETION_ONSTACK(comp); | |
2bd37f0f | 486 | struct virtio_scsi_target_state *tgt = vscsi->tgt[cmd->sc->device->id]; |
e4594bb5 | 487 | int ret = FAILED; |
4fe74b1c PB |
488 | |
489 | cmd->comp = ∁ | |
2bd37f0f | 490 | if (virtscsi_kick_cmd(tgt, &vscsi->ctrl_vq, cmd, |
e4594bb5 PB |
491 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf, |
492 | GFP_NOIO) < 0) | |
493 | goto out; | |
4fe74b1c PB |
494 | |
495 | wait_for_completion(&comp); | |
e4594bb5 PB |
496 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
497 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
498 | ret = SUCCESS; | |
4fe74b1c | 499 | |
e4594bb5 PB |
500 | out: |
501 | mempool_free(cmd, virtscsi_cmd_pool); | |
502 | return ret; | |
4fe74b1c PB |
503 | } |
504 | ||
505 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
506 | { | |
507 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
508 | struct virtio_scsi_cmd *cmd; | |
509 | ||
510 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
511 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
512 | if (!cmd) | |
513 | return FAILED; | |
514 | ||
515 | memset(cmd, 0, sizeof(*cmd)); | |
516 | cmd->sc = sc; | |
517 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
518 | .type = VIRTIO_SCSI_T_TMF, | |
519 | .subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET, | |
520 | .lun[0] = 1, | |
521 | .lun[1] = sc->device->id, | |
522 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
523 | .lun[3] = sc->device->lun & 0xff, | |
524 | }; | |
525 | return virtscsi_tmf(vscsi, cmd); | |
526 | } | |
527 | ||
528 | static int virtscsi_abort(struct scsi_cmnd *sc) | |
529 | { | |
530 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
531 | struct virtio_scsi_cmd *cmd; | |
532 | ||
533 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
534 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
535 | if (!cmd) | |
536 | return FAILED; | |
537 | ||
538 | memset(cmd, 0, sizeof(*cmd)); | |
539 | cmd->sc = sc; | |
540 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
541 | .type = VIRTIO_SCSI_T_TMF, | |
542 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
543 | .lun[0] = 1, | |
544 | .lun[1] = sc->device->id, | |
545 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
546 | .lun[3] = sc->device->lun & 0xff, | |
547 | .tag = (unsigned long)sc, | |
548 | }; | |
549 | return virtscsi_tmf(vscsi, cmd); | |
550 | } | |
551 | ||
552 | static struct scsi_host_template virtscsi_host_template = { | |
553 | .module = THIS_MODULE, | |
554 | .name = "Virtio SCSI HBA", | |
555 | .proc_name = "virtio_scsi", | |
556 | .queuecommand = virtscsi_queuecommand, | |
557 | .this_id = -1, | |
558 | .eh_abort_handler = virtscsi_abort, | |
559 | .eh_device_reset_handler = virtscsi_device_reset, | |
560 | ||
561 | .can_queue = 1024, | |
562 | .dma_boundary = UINT_MAX, | |
563 | .use_clustering = ENABLE_CLUSTERING, | |
564 | }; | |
565 | ||
566 | #define virtscsi_config_get(vdev, fld) \ | |
567 | ({ \ | |
568 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
569 | vdev->config->get(vdev, \ | |
570 | offsetof(struct virtio_scsi_config, fld), \ | |
571 | &__val, sizeof(__val)); \ | |
572 | __val; \ | |
573 | }) | |
574 | ||
575 | #define virtscsi_config_set(vdev, fld, val) \ | |
576 | (void)({ \ | |
577 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ | |
578 | vdev->config->set(vdev, \ | |
579 | offsetof(struct virtio_scsi_config, fld), \ | |
580 | &__val, sizeof(__val)); \ | |
581 | }) | |
582 | ||
139fe45a PB |
583 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
584 | struct virtqueue *vq) | |
585 | { | |
586 | spin_lock_init(&virtscsi_vq->vq_lock); | |
587 | virtscsi_vq->vq = vq; | |
588 | } | |
589 | ||
2bd37f0f PB |
590 | static struct virtio_scsi_target_state *virtscsi_alloc_tgt( |
591 | struct virtio_device *vdev, int sg_elems) | |
592 | { | |
593 | struct virtio_scsi_target_state *tgt; | |
594 | gfp_t gfp_mask = GFP_KERNEL; | |
595 | ||
596 | /* We need extra sg elements at head and tail. */ | |
597 | tgt = kmalloc(sizeof(*tgt) + sizeof(tgt->sg[0]) * (sg_elems + 2), | |
598 | gfp_mask); | |
599 | ||
600 | if (!tgt) | |
601 | return NULL; | |
602 | ||
603 | spin_lock_init(&tgt->tgt_lock); | |
604 | sg_init_table(tgt->sg, sg_elems + 2); | |
605 | return tgt; | |
606 | } | |
607 | ||
59057fbc NB |
608 | static void virtscsi_scan(struct virtio_device *vdev) |
609 | { | |
610 | struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv; | |
611 | ||
612 | scsi_scan_host(shost); | |
613 | } | |
614 | ||
2bd37f0f PB |
615 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
616 | { | |
617 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
618 | struct virtio_scsi *vscsi = shost_priv(sh); | |
619 | u32 i, num_targets; | |
620 | ||
621 | /* Stop all the virtqueues. */ | |
622 | vdev->config->reset(vdev); | |
623 | ||
624 | num_targets = sh->max_id; | |
625 | for (i = 0; i < num_targets; i++) { | |
626 | kfree(vscsi->tgt[i]); | |
627 | vscsi->tgt[i] = NULL; | |
628 | } | |
629 | ||
630 | vdev->config->del_vqs(vdev); | |
631 | } | |
632 | ||
4fe74b1c | 633 | static int virtscsi_init(struct virtio_device *vdev, |
2bd37f0f | 634 | struct virtio_scsi *vscsi, int num_targets) |
4fe74b1c PB |
635 | { |
636 | int err; | |
637 | struct virtqueue *vqs[3]; | |
2bd37f0f PB |
638 | u32 i, sg_elems; |
639 | ||
4fe74b1c PB |
640 | vq_callback_t *callbacks[] = { |
641 | virtscsi_ctrl_done, | |
642 | virtscsi_event_done, | |
643 | virtscsi_req_done | |
644 | }; | |
645 | const char *names[] = { | |
646 | "control", | |
647 | "event", | |
648 | "request" | |
649 | }; | |
650 | ||
651 | /* Discover virtqueues and write information to configuration. */ | |
652 | err = vdev->config->find_vqs(vdev, 3, vqs, callbacks, names); | |
653 | if (err) | |
654 | return err; | |
655 | ||
139fe45a PB |
656 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
657 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
658 | virtscsi_init_vq(&vscsi->req_vq, vqs[2]); | |
4fe74b1c PB |
659 | |
660 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); | |
661 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 662 | |
365a7150 CM |
663 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
664 | virtscsi_kick_event_all(vscsi); | |
665 | ||
2bd37f0f PB |
666 | /* We need to know how many segments before we allocate. */ |
667 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; | |
668 | ||
669 | for (i = 0; i < num_targets; i++) { | |
670 | vscsi->tgt[i] = virtscsi_alloc_tgt(vdev, sg_elems); | |
671 | if (!vscsi->tgt[i]) { | |
672 | err = -ENOMEM; | |
673 | goto out; | |
674 | } | |
675 | } | |
676 | err = 0; | |
677 | ||
678 | out: | |
679 | if (err) | |
680 | virtscsi_remove_vqs(vdev); | |
681 | return err; | |
4fe74b1c PB |
682 | } |
683 | ||
6f039790 | 684 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
685 | { |
686 | struct Scsi_Host *shost; | |
687 | struct virtio_scsi *vscsi; | |
688 | int err; | |
2bd37f0f | 689 | u32 sg_elems, num_targets; |
4fe74b1c PB |
690 | u32 cmd_per_lun; |
691 | ||
4fe74b1c | 692 | /* Allocate memory and link the structs together. */ |
2bd37f0f | 693 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 694 | shost = scsi_host_alloc(&virtscsi_host_template, |
2bd37f0f PB |
695 | sizeof(*vscsi) |
696 | + num_targets * sizeof(struct virtio_scsi_target_state)); | |
4fe74b1c PB |
697 | |
698 | if (!shost) | |
699 | return -ENOMEM; | |
700 | ||
2bd37f0f | 701 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
702 | shost->sg_tablesize = sg_elems; |
703 | vscsi = shost_priv(shost); | |
704 | vscsi->vdev = vdev; | |
705 | vdev->priv = shost; | |
706 | ||
2bd37f0f | 707 | err = virtscsi_init(vdev, vscsi, num_targets); |
4fe74b1c PB |
708 | if (err) |
709 | goto virtscsi_init_failed; | |
710 | ||
711 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; | |
712 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
713 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
714 | |
715 | /* LUNs > 256 are reported with format 1, so they go in the range | |
716 | * 16640-32767. | |
717 | */ | |
718 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 719 | shost->max_id = num_targets; |
4fe74b1c PB |
720 | shost->max_channel = 0; |
721 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
722 | err = scsi_add_host(shost, &vdev->dev); | |
723 | if (err) | |
724 | goto scsi_add_host_failed; | |
59057fbc NB |
725 | /* |
726 | * scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan() | |
727 | * after VIRTIO_CONFIG_S_DRIVER_OK has been set.. | |
728 | */ | |
4fe74b1c PB |
729 | return 0; |
730 | ||
731 | scsi_add_host_failed: | |
732 | vdev->config->del_vqs(vdev); | |
733 | virtscsi_init_failed: | |
734 | scsi_host_put(shost); | |
735 | return err; | |
736 | } | |
737 | ||
6f039790 | 738 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
739 | { |
740 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
741 | struct virtio_scsi *vscsi = shost_priv(shost); |
742 | ||
743 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
744 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
745 | |
746 | scsi_remove_host(shost); | |
747 | ||
748 | virtscsi_remove_vqs(vdev); | |
749 | scsi_host_put(shost); | |
750 | } | |
751 | ||
752 | #ifdef CONFIG_PM | |
753 | static int virtscsi_freeze(struct virtio_device *vdev) | |
754 | { | |
755 | virtscsi_remove_vqs(vdev); | |
756 | return 0; | |
757 | } | |
758 | ||
759 | static int virtscsi_restore(struct virtio_device *vdev) | |
760 | { | |
761 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
762 | struct virtio_scsi *vscsi = shost_priv(sh); | |
763 | ||
2bd37f0f | 764 | return virtscsi_init(vdev, vscsi, sh->max_id); |
4fe74b1c PB |
765 | } |
766 | #endif | |
767 | ||
768 | static struct virtio_device_id id_table[] = { | |
769 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
770 | { 0 }, | |
771 | }; | |
772 | ||
365a7150 | 773 | static unsigned int features[] = { |
865b58c0 PB |
774 | VIRTIO_SCSI_F_HOTPLUG, |
775 | VIRTIO_SCSI_F_CHANGE, | |
365a7150 CM |
776 | }; |
777 | ||
4fe74b1c | 778 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
779 | .feature_table = features, |
780 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
781 | .driver.name = KBUILD_MODNAME, |
782 | .driver.owner = THIS_MODULE, | |
783 | .id_table = id_table, | |
784 | .probe = virtscsi_probe, | |
59057fbc | 785 | .scan = virtscsi_scan, |
4fe74b1c PB |
786 | #ifdef CONFIG_PM |
787 | .freeze = virtscsi_freeze, | |
788 | .restore = virtscsi_restore, | |
789 | #endif | |
6f039790 | 790 | .remove = virtscsi_remove, |
4fe74b1c PB |
791 | }; |
792 | ||
793 | static int __init init(void) | |
794 | { | |
795 | int ret = -ENOMEM; | |
796 | ||
797 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
798 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 799 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
800 | goto error; |
801 | } | |
802 | ||
803 | ||
804 | virtscsi_cmd_pool = | |
805 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
806 | virtscsi_cmd_cache); | |
807 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 808 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
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"); |