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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 { | |
682993b4 | 64 | /* Never held at the same time as vq_lock. */ |
2bd37f0f | 65 | spinlock_t tgt_lock; |
2bd37f0f PB |
66 | }; |
67 | ||
4fe74b1c PB |
68 | /* Driver instance state */ |
69 | struct virtio_scsi { | |
4fe74b1c | 70 | struct virtio_device *vdev; |
2bd37f0f | 71 | |
139fe45a PB |
72 | struct virtio_scsi_vq ctrl_vq; |
73 | struct virtio_scsi_vq event_vq; | |
74 | struct virtio_scsi_vq req_vq; | |
4fe74b1c | 75 | |
365a7150 CM |
76 | /* Get some buffers ready for event vq */ |
77 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
78 | ||
2bd37f0f | 79 | struct virtio_scsi_target_state *tgt[]; |
4fe74b1c PB |
80 | }; |
81 | ||
82 | static struct kmem_cache *virtscsi_cmd_cache; | |
83 | static mempool_t *virtscsi_cmd_pool; | |
84 | ||
85 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
86 | { | |
87 | return vdev->priv; | |
88 | } | |
89 | ||
90 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
91 | { | |
92 | if (!resid) | |
93 | return; | |
94 | ||
95 | if (!scsi_bidi_cmnd(sc)) { | |
96 | scsi_set_resid(sc, resid); | |
97 | return; | |
98 | } | |
99 | ||
100 | scsi_in(sc)->resid = min(resid, scsi_in(sc)->length); | |
101 | scsi_out(sc)->resid = resid - scsi_in(sc)->resid; | |
102 | } | |
103 | ||
104 | /** | |
105 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
106 | * | |
107 | * Called with vq_lock held. | |
108 | */ | |
109 | static void virtscsi_complete_cmd(void *buf) | |
110 | { | |
111 | struct virtio_scsi_cmd *cmd = buf; | |
112 | struct scsi_cmnd *sc = cmd->sc; | |
113 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
114 | ||
115 | dev_dbg(&sc->device->sdev_gendev, | |
116 | "cmd %p response %u status %#02x sense_len %u\n", | |
117 | sc, resp->response, resp->status, resp->sense_len); | |
118 | ||
119 | sc->result = resp->status; | |
120 | virtscsi_compute_resid(sc, resp->resid); | |
121 | switch (resp->response) { | |
122 | case VIRTIO_SCSI_S_OK: | |
123 | set_host_byte(sc, DID_OK); | |
124 | break; | |
125 | case VIRTIO_SCSI_S_OVERRUN: | |
126 | set_host_byte(sc, DID_ERROR); | |
127 | break; | |
128 | case VIRTIO_SCSI_S_ABORTED: | |
129 | set_host_byte(sc, DID_ABORT); | |
130 | break; | |
131 | case VIRTIO_SCSI_S_BAD_TARGET: | |
132 | set_host_byte(sc, DID_BAD_TARGET); | |
133 | break; | |
134 | case VIRTIO_SCSI_S_RESET: | |
135 | set_host_byte(sc, DID_RESET); | |
136 | break; | |
137 | case VIRTIO_SCSI_S_BUSY: | |
138 | set_host_byte(sc, DID_BUS_BUSY); | |
139 | break; | |
140 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
141 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
142 | break; | |
143 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
144 | set_host_byte(sc, DID_TARGET_FAILURE); | |
145 | break; | |
146 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
147 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
148 | break; | |
149 | default: | |
150 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
151 | resp->response); | |
152 | /* fall through */ | |
153 | case VIRTIO_SCSI_S_FAILURE: | |
154 | set_host_byte(sc, DID_ERROR); | |
155 | break; | |
156 | } | |
157 | ||
158 | WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE); | |
159 | if (sc->sense_buffer) { | |
160 | memcpy(sc->sense_buffer, resp->sense, | |
161 | min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE)); | |
162 | if (resp->sense_len) | |
163 | set_driver_byte(sc, DRIVER_SENSE); | |
164 | } | |
165 | ||
166 | mempool_free(cmd, virtscsi_cmd_pool); | |
167 | sc->scsi_done(sc); | |
168 | } | |
169 | ||
170 | static void virtscsi_vq_done(struct virtqueue *vq, void (*fn)(void *buf)) | |
171 | { | |
4fe74b1c | 172 | void *buf; |
4fe74b1c PB |
173 | unsigned int len; |
174 | ||
4fe74b1c PB |
175 | do { |
176 | virtqueue_disable_cb(vq); | |
177 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
178 | fn(buf); | |
179 | } while (!virtqueue_enable_cb(vq)); | |
4fe74b1c PB |
180 | } |
181 | ||
182 | static void virtscsi_req_done(struct virtqueue *vq) | |
183 | { | |
139fe45a PB |
184 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
185 | struct virtio_scsi *vscsi = shost_priv(sh); | |
186 | unsigned long flags; | |
187 | ||
188 | spin_lock_irqsave(&vscsi->req_vq.vq_lock, flags); | |
4fe74b1c | 189 | virtscsi_vq_done(vq, virtscsi_complete_cmd); |
139fe45a | 190 | spin_unlock_irqrestore(&vscsi->req_vq.vq_lock, flags); |
4fe74b1c PB |
191 | }; |
192 | ||
193 | static void virtscsi_complete_free(void *buf) | |
194 | { | |
195 | struct virtio_scsi_cmd *cmd = buf; | |
196 | ||
197 | if (cmd->comp) | |
198 | complete_all(cmd->comp); | |
e4594bb5 PB |
199 | else |
200 | mempool_free(cmd, virtscsi_cmd_pool); | |
4fe74b1c PB |
201 | } |
202 | ||
203 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
204 | { | |
139fe45a PB |
205 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
206 | struct virtio_scsi *vscsi = shost_priv(sh); | |
207 | unsigned long flags; | |
208 | ||
209 | spin_lock_irqsave(&vscsi->ctrl_vq.vq_lock, flags); | |
4fe74b1c | 210 | virtscsi_vq_done(vq, virtscsi_complete_free); |
139fe45a | 211 | spin_unlock_irqrestore(&vscsi->ctrl_vq.vq_lock, flags); |
4fe74b1c PB |
212 | }; |
213 | ||
365a7150 CM |
214 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
215 | struct virtio_scsi_event_node *event_node) | |
216 | { | |
4614e51c | 217 | int err; |
365a7150 CM |
218 | struct scatterlist sg; |
219 | unsigned long flags; | |
220 | ||
2e9c9dfd | 221 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
222 | |
223 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
224 | ||
bf958291 RR |
225 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
226 | GFP_ATOMIC); | |
4614e51c | 227 | if (!err) |
365a7150 CM |
228 | virtqueue_kick(vscsi->event_vq.vq); |
229 | ||
230 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
231 | ||
4614e51c | 232 | return err; |
365a7150 CM |
233 | } |
234 | ||
235 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
236 | { | |
237 | int i; | |
238 | ||
239 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
240 | vscsi->event_list[i].vscsi = vscsi; | |
241 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
242 | } | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
248 | { | |
249 | int i; | |
250 | ||
251 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) | |
252 | cancel_work_sync(&vscsi->event_list[i].work); | |
253 | } | |
254 | ||
255 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
256 | struct virtio_scsi_event *event) | |
257 | { | |
258 | struct scsi_device *sdev; | |
259 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
260 | unsigned int target = event->lun[1]; | |
261 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
262 | ||
263 | switch (event->reason) { | |
264 | case VIRTIO_SCSI_EVT_RESET_RESCAN: | |
265 | scsi_add_device(shost, 0, target, lun); | |
266 | break; | |
267 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
268 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
269 | if (sdev) { | |
270 | scsi_remove_device(sdev); | |
271 | scsi_device_put(sdev); | |
272 | } else { | |
273 | pr_err("SCSI device %d 0 %d %d not found\n", | |
274 | shost->host_no, target, lun); | |
275 | } | |
276 | break; | |
277 | default: | |
278 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
279 | } | |
280 | } | |
281 | ||
865b58c0 PB |
282 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
283 | struct virtio_scsi_event *event) | |
284 | { | |
285 | struct scsi_device *sdev; | |
286 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
287 | unsigned int target = event->lun[1]; | |
288 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
289 | u8 asc = event->reason & 255; | |
290 | u8 ascq = event->reason >> 8; | |
291 | ||
292 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
293 | if (!sdev) { | |
294 | pr_err("SCSI device %d 0 %d %d not found\n", | |
295 | shost->host_no, target, lun); | |
296 | return; | |
297 | } | |
298 | ||
299 | /* Handle "Parameters changed", "Mode parameters changed", and | |
300 | "Capacity data has changed". */ | |
301 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
302 | scsi_rescan_device(&sdev->sdev_gendev); | |
303 | ||
304 | scsi_device_put(sdev); | |
305 | } | |
306 | ||
365a7150 CM |
307 | static void virtscsi_handle_event(struct work_struct *work) |
308 | { | |
309 | struct virtio_scsi_event_node *event_node = | |
310 | container_of(work, struct virtio_scsi_event_node, work); | |
311 | struct virtio_scsi *vscsi = event_node->vscsi; | |
312 | struct virtio_scsi_event *event = &event_node->event; | |
313 | ||
314 | if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) { | |
315 | event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED; | |
316 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); | |
317 | } | |
318 | ||
319 | switch (event->event) { | |
320 | case VIRTIO_SCSI_T_NO_EVENT: | |
321 | break; | |
322 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
323 | virtscsi_handle_transport_reset(vscsi, event); | |
324 | break; | |
865b58c0 PB |
325 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
326 | virtscsi_handle_param_change(vscsi, event); | |
327 | break; | |
365a7150 CM |
328 | default: |
329 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
330 | } | |
331 | virtscsi_kick_event(vscsi, event_node); | |
332 | } | |
333 | ||
334 | static void virtscsi_complete_event(void *buf) | |
335 | { | |
336 | struct virtio_scsi_event_node *event_node = buf; | |
337 | ||
338 | INIT_WORK(&event_node->work, virtscsi_handle_event); | |
339 | schedule_work(&event_node->work); | |
340 | } | |
341 | ||
4fe74b1c PB |
342 | static void virtscsi_event_done(struct virtqueue *vq) |
343 | { | |
139fe45a PB |
344 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
345 | struct virtio_scsi *vscsi = shost_priv(sh); | |
346 | unsigned long flags; | |
347 | ||
348 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
365a7150 | 349 | virtscsi_vq_done(vq, virtscsi_complete_event); |
139fe45a | 350 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); |
4fe74b1c PB |
351 | }; |
352 | ||
4fe74b1c | 353 | /** |
682993b4 WG |
354 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue |
355 | * @vq : the struct virtqueue we're talking about | |
4fe74b1c | 356 | * @cmd : command structure |
4fe74b1c PB |
357 | * @req_size : size of the request buffer |
358 | * @resp_size : size of the response buffer | |
682993b4 | 359 | * @gfp : flags to use for memory allocations |
4fe74b1c | 360 | */ |
682993b4 WG |
361 | static int virtscsi_add_cmd(struct virtqueue *vq, |
362 | struct virtio_scsi_cmd *cmd, | |
363 | size_t req_size, size_t resp_size, gfp_t gfp) | |
4fe74b1c PB |
364 | { |
365 | struct scsi_cmnd *sc = cmd->sc; | |
682993b4 WG |
366 | struct scatterlist *sgs[4], req, resp; |
367 | struct sg_table *out, *in; | |
368 | unsigned out_num = 0, in_num = 0; | |
369 | ||
370 | out = in = NULL; | |
371 | ||
372 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
373 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
374 | out = &scsi_out(sc)->table; | |
375 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
376 | in = &scsi_in(sc)->table; | |
377 | } | |
4fe74b1c | 378 | |
4fe74b1c | 379 | /* Request header. */ |
682993b4 WG |
380 | sg_init_one(&req, &cmd->req, req_size); |
381 | sgs[out_num++] = &req; | |
4fe74b1c PB |
382 | |
383 | /* Data-out buffer. */ | |
682993b4 WG |
384 | if (out) |
385 | sgs[out_num++] = out->sgl; | |
4fe74b1c PB |
386 | |
387 | /* Response header. */ | |
682993b4 WG |
388 | sg_init_one(&resp, &cmd->resp, resp_size); |
389 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
390 | |
391 | /* Data-in buffer */ | |
682993b4 WG |
392 | if (in) |
393 | sgs[out_num + in_num++] = in->sgl; | |
4fe74b1c | 394 | |
682993b4 | 395 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, gfp); |
4fe74b1c PB |
396 | } |
397 | ||
682993b4 | 398 | static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, |
4fe74b1c PB |
399 | struct virtio_scsi_cmd *cmd, |
400 | size_t req_size, size_t resp_size, gfp_t gfp) | |
401 | { | |
4fe74b1c | 402 | unsigned long flags; |
4614e51c RR |
403 | int err; |
404 | bool needs_kick = false; | |
4fe74b1c | 405 | |
682993b4 WG |
406 | spin_lock_irqsave(&vq->vq_lock, flags); |
407 | err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size, gfp); | |
4614e51c RR |
408 | if (!err) |
409 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 410 | |
bce750b1 | 411 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 412 | |
4614e51c | 413 | if (needs_kick) |
139fe45a | 414 | virtqueue_notify(vq->vq); |
4614e51c | 415 | return err; |
4fe74b1c PB |
416 | } |
417 | ||
418 | static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) | |
419 | { | |
420 | struct virtio_scsi *vscsi = shost_priv(sh); | |
421 | struct virtio_scsi_cmd *cmd; | |
422 | int ret; | |
423 | ||
2bd37f0f PB |
424 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
425 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); | |
426 | ||
427 | /* TODO: check feature bit and fail if unsupported? */ | |
428 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
429 | ||
4fe74b1c PB |
430 | dev_dbg(&sc->device->sdev_gendev, |
431 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
432 | ||
433 | ret = SCSI_MLQUEUE_HOST_BUSY; | |
434 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_ATOMIC); | |
435 | if (!cmd) | |
436 | goto out; | |
437 | ||
438 | memset(cmd, 0, sizeof(*cmd)); | |
439 | cmd->sc = sc; | |
440 | cmd->req.cmd = (struct virtio_scsi_cmd_req){ | |
441 | .lun[0] = 1, | |
442 | .lun[1] = sc->device->id, | |
443 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
444 | .lun[3] = sc->device->lun & 0xff, | |
445 | .tag = (unsigned long)sc, | |
446 | .task_attr = VIRTIO_SCSI_S_SIMPLE, | |
447 | .prio = 0, | |
448 | .crn = 0, | |
449 | }; | |
450 | ||
451 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
452 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); | |
453 | ||
682993b4 | 454 | if (virtscsi_kick_cmd(&vscsi->req_vq, cmd, |
4fe74b1c | 455 | sizeof cmd->req.cmd, sizeof cmd->resp.cmd, |
4614e51c | 456 | GFP_ATOMIC) == 0) |
4fe74b1c | 457 | ret = 0; |
b56d1003 EN |
458 | else |
459 | mempool_free(cmd, virtscsi_cmd_pool); | |
4fe74b1c PB |
460 | |
461 | out: | |
462 | return ret; | |
463 | } | |
464 | ||
465 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) | |
466 | { | |
467 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 468 | int ret = FAILED; |
4fe74b1c PB |
469 | |
470 | cmd->comp = ∁ | |
682993b4 | 471 | if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd, |
e4594bb5 PB |
472 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf, |
473 | GFP_NOIO) < 0) | |
474 | goto out; | |
4fe74b1c PB |
475 | |
476 | wait_for_completion(&comp); | |
e4594bb5 PB |
477 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
478 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
479 | ret = SUCCESS; | |
4fe74b1c | 480 | |
e4594bb5 PB |
481 | out: |
482 | mempool_free(cmd, virtscsi_cmd_pool); | |
483 | return ret; | |
4fe74b1c PB |
484 | } |
485 | ||
486 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
487 | { | |
488 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
489 | struct virtio_scsi_cmd *cmd; | |
490 | ||
491 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
492 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
493 | if (!cmd) | |
494 | return FAILED; | |
495 | ||
496 | memset(cmd, 0, sizeof(*cmd)); | |
497 | cmd->sc = sc; | |
498 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
499 | .type = VIRTIO_SCSI_T_TMF, | |
500 | .subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET, | |
501 | .lun[0] = 1, | |
502 | .lun[1] = sc->device->id, | |
503 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
504 | .lun[3] = sc->device->lun & 0xff, | |
505 | }; | |
506 | return virtscsi_tmf(vscsi, cmd); | |
507 | } | |
508 | ||
509 | static int virtscsi_abort(struct scsi_cmnd *sc) | |
510 | { | |
511 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
512 | struct virtio_scsi_cmd *cmd; | |
513 | ||
514 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
515 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
516 | if (!cmd) | |
517 | return FAILED; | |
518 | ||
519 | memset(cmd, 0, sizeof(*cmd)); | |
520 | cmd->sc = sc; | |
521 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
522 | .type = VIRTIO_SCSI_T_TMF, | |
523 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
524 | .lun[0] = 1, | |
525 | .lun[1] = sc->device->id, | |
526 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
527 | .lun[3] = sc->device->lun & 0xff, | |
528 | .tag = (unsigned long)sc, | |
529 | }; | |
530 | return virtscsi_tmf(vscsi, cmd); | |
531 | } | |
532 | ||
533 | static struct scsi_host_template virtscsi_host_template = { | |
534 | .module = THIS_MODULE, | |
535 | .name = "Virtio SCSI HBA", | |
536 | .proc_name = "virtio_scsi", | |
537 | .queuecommand = virtscsi_queuecommand, | |
538 | .this_id = -1, | |
539 | .eh_abort_handler = virtscsi_abort, | |
540 | .eh_device_reset_handler = virtscsi_device_reset, | |
541 | ||
542 | .can_queue = 1024, | |
543 | .dma_boundary = UINT_MAX, | |
544 | .use_clustering = ENABLE_CLUSTERING, | |
545 | }; | |
546 | ||
547 | #define virtscsi_config_get(vdev, fld) \ | |
548 | ({ \ | |
549 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
550 | vdev->config->get(vdev, \ | |
551 | offsetof(struct virtio_scsi_config, fld), \ | |
552 | &__val, sizeof(__val)); \ | |
553 | __val; \ | |
554 | }) | |
555 | ||
556 | #define virtscsi_config_set(vdev, fld, val) \ | |
557 | (void)({ \ | |
558 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ | |
559 | vdev->config->set(vdev, \ | |
560 | offsetof(struct virtio_scsi_config, fld), \ | |
561 | &__val, sizeof(__val)); \ | |
562 | }) | |
563 | ||
139fe45a PB |
564 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
565 | struct virtqueue *vq) | |
566 | { | |
567 | spin_lock_init(&virtscsi_vq->vq_lock); | |
568 | virtscsi_vq->vq = vq; | |
569 | } | |
570 | ||
2bd37f0f | 571 | static struct virtio_scsi_target_state *virtscsi_alloc_tgt( |
682993b4 | 572 | struct virtio_device *vdev) |
2bd37f0f PB |
573 | { |
574 | struct virtio_scsi_target_state *tgt; | |
575 | gfp_t gfp_mask = GFP_KERNEL; | |
576 | ||
682993b4 | 577 | tgt = kmalloc(sizeof(*tgt), gfp_mask); |
2bd37f0f PB |
578 | if (!tgt) |
579 | return NULL; | |
580 | ||
581 | spin_lock_init(&tgt->tgt_lock); | |
2bd37f0f PB |
582 | return tgt; |
583 | } | |
584 | ||
59057fbc NB |
585 | static void virtscsi_scan(struct virtio_device *vdev) |
586 | { | |
587 | struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv; | |
588 | ||
589 | scsi_scan_host(shost); | |
590 | } | |
591 | ||
2bd37f0f PB |
592 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
593 | { | |
594 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
595 | struct virtio_scsi *vscsi = shost_priv(sh); | |
596 | u32 i, num_targets; | |
597 | ||
598 | /* Stop all the virtqueues. */ | |
599 | vdev->config->reset(vdev); | |
600 | ||
601 | num_targets = sh->max_id; | |
602 | for (i = 0; i < num_targets; i++) { | |
603 | kfree(vscsi->tgt[i]); | |
604 | vscsi->tgt[i] = NULL; | |
605 | } | |
606 | ||
607 | vdev->config->del_vqs(vdev); | |
608 | } | |
609 | ||
4fe74b1c | 610 | static int virtscsi_init(struct virtio_device *vdev, |
2bd37f0f | 611 | struct virtio_scsi *vscsi, int num_targets) |
4fe74b1c PB |
612 | { |
613 | int err; | |
614 | struct virtqueue *vqs[3]; | |
682993b4 | 615 | u32 i; |
2bd37f0f | 616 | |
4fe74b1c PB |
617 | vq_callback_t *callbacks[] = { |
618 | virtscsi_ctrl_done, | |
619 | virtscsi_event_done, | |
620 | virtscsi_req_done | |
621 | }; | |
622 | const char *names[] = { | |
623 | "control", | |
624 | "event", | |
625 | "request" | |
626 | }; | |
627 | ||
628 | /* Discover virtqueues and write information to configuration. */ | |
629 | err = vdev->config->find_vqs(vdev, 3, vqs, callbacks, names); | |
630 | if (err) | |
631 | return err; | |
632 | ||
139fe45a PB |
633 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
634 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
635 | virtscsi_init_vq(&vscsi->req_vq, vqs[2]); | |
4fe74b1c PB |
636 | |
637 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); | |
638 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 639 | |
365a7150 CM |
640 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
641 | virtscsi_kick_event_all(vscsi); | |
642 | ||
2bd37f0f | 643 | for (i = 0; i < num_targets; i++) { |
682993b4 | 644 | vscsi->tgt[i] = virtscsi_alloc_tgt(vdev); |
2bd37f0f PB |
645 | if (!vscsi->tgt[i]) { |
646 | err = -ENOMEM; | |
647 | goto out; | |
648 | } | |
649 | } | |
650 | err = 0; | |
651 | ||
652 | out: | |
653 | if (err) | |
654 | virtscsi_remove_vqs(vdev); | |
655 | return err; | |
4fe74b1c PB |
656 | } |
657 | ||
6f039790 | 658 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
659 | { |
660 | struct Scsi_Host *shost; | |
661 | struct virtio_scsi *vscsi; | |
662 | int err; | |
2bd37f0f | 663 | u32 sg_elems, num_targets; |
4fe74b1c PB |
664 | u32 cmd_per_lun; |
665 | ||
4fe74b1c | 666 | /* Allocate memory and link the structs together. */ |
2bd37f0f | 667 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 668 | shost = scsi_host_alloc(&virtscsi_host_template, |
2bd37f0f PB |
669 | sizeof(*vscsi) |
670 | + num_targets * sizeof(struct virtio_scsi_target_state)); | |
4fe74b1c PB |
671 | |
672 | if (!shost) | |
673 | return -ENOMEM; | |
674 | ||
2bd37f0f | 675 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
676 | shost->sg_tablesize = sg_elems; |
677 | vscsi = shost_priv(shost); | |
678 | vscsi->vdev = vdev; | |
679 | vdev->priv = shost; | |
680 | ||
2bd37f0f | 681 | err = virtscsi_init(vdev, vscsi, num_targets); |
4fe74b1c PB |
682 | if (err) |
683 | goto virtscsi_init_failed; | |
684 | ||
685 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; | |
686 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
687 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
688 | |
689 | /* LUNs > 256 are reported with format 1, so they go in the range | |
690 | * 16640-32767. | |
691 | */ | |
692 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 693 | shost->max_id = num_targets; |
4fe74b1c PB |
694 | shost->max_channel = 0; |
695 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
696 | err = scsi_add_host(shost, &vdev->dev); | |
697 | if (err) | |
698 | goto scsi_add_host_failed; | |
59057fbc NB |
699 | /* |
700 | * scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan() | |
701 | * after VIRTIO_CONFIG_S_DRIVER_OK has been set.. | |
702 | */ | |
4fe74b1c PB |
703 | return 0; |
704 | ||
705 | scsi_add_host_failed: | |
706 | vdev->config->del_vqs(vdev); | |
707 | virtscsi_init_failed: | |
708 | scsi_host_put(shost); | |
709 | return err; | |
710 | } | |
711 | ||
6f039790 | 712 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
713 | { |
714 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
715 | struct virtio_scsi *vscsi = shost_priv(shost); |
716 | ||
717 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
718 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
719 | |
720 | scsi_remove_host(shost); | |
721 | ||
722 | virtscsi_remove_vqs(vdev); | |
723 | scsi_host_put(shost); | |
724 | } | |
725 | ||
726 | #ifdef CONFIG_PM | |
727 | static int virtscsi_freeze(struct virtio_device *vdev) | |
728 | { | |
729 | virtscsi_remove_vqs(vdev); | |
730 | return 0; | |
731 | } | |
732 | ||
733 | static int virtscsi_restore(struct virtio_device *vdev) | |
734 | { | |
735 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
736 | struct virtio_scsi *vscsi = shost_priv(sh); | |
737 | ||
2bd37f0f | 738 | return virtscsi_init(vdev, vscsi, sh->max_id); |
4fe74b1c PB |
739 | } |
740 | #endif | |
741 | ||
742 | static struct virtio_device_id id_table[] = { | |
743 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
744 | { 0 }, | |
745 | }; | |
746 | ||
365a7150 | 747 | static unsigned int features[] = { |
865b58c0 PB |
748 | VIRTIO_SCSI_F_HOTPLUG, |
749 | VIRTIO_SCSI_F_CHANGE, | |
365a7150 CM |
750 | }; |
751 | ||
4fe74b1c | 752 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
753 | .feature_table = features, |
754 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
755 | .driver.name = KBUILD_MODNAME, |
756 | .driver.owner = THIS_MODULE, | |
757 | .id_table = id_table, | |
758 | .probe = virtscsi_probe, | |
59057fbc | 759 | .scan = virtscsi_scan, |
4fe74b1c PB |
760 | #ifdef CONFIG_PM |
761 | .freeze = virtscsi_freeze, | |
762 | .restore = virtscsi_restore, | |
763 | #endif | |
6f039790 | 764 | .remove = virtscsi_remove, |
4fe74b1c PB |
765 | }; |
766 | ||
767 | static int __init init(void) | |
768 | { | |
769 | int ret = -ENOMEM; | |
770 | ||
771 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
772 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 773 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
774 | goto error; |
775 | } | |
776 | ||
777 | ||
778 | virtscsi_cmd_pool = | |
779 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
780 | virtscsi_cmd_cache); | |
781 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 782 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
783 | goto error; |
784 | } | |
785 | ret = register_virtio_driver(&virtio_scsi_driver); | |
786 | if (ret < 0) | |
787 | goto error; | |
788 | ||
789 | return 0; | |
790 | ||
791 | error: | |
792 | if (virtscsi_cmd_pool) { | |
793 | mempool_destroy(virtscsi_cmd_pool); | |
794 | virtscsi_cmd_pool = NULL; | |
795 | } | |
796 | if (virtscsi_cmd_cache) { | |
797 | kmem_cache_destroy(virtscsi_cmd_cache); | |
798 | virtscsi_cmd_cache = NULL; | |
799 | } | |
800 | return ret; | |
801 | } | |
802 | ||
803 | static void __exit fini(void) | |
804 | { | |
805 | unregister_virtio_driver(&virtio_scsi_driver); | |
806 | mempool_destroy(virtscsi_cmd_pool); | |
807 | kmem_cache_destroy(virtscsi_cmd_cache); | |
808 | } | |
809 | module_init(init); | |
810 | module_exit(fini); | |
811 | ||
812 | MODULE_DEVICE_TABLE(virtio, id_table); | |
813 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
814 | MODULE_LICENSE("GPL"); |