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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> | |
9141a4ca | 25 | #include <linux/cpu.h> |
4fe74b1c PB |
26 | #include <scsi/scsi_host.h> |
27 | #include <scsi/scsi_device.h> | |
28 | #include <scsi/scsi_cmnd.h> | |
29 | ||
30 | #define VIRTIO_SCSI_MEMPOOL_SZ 64 | |
365a7150 | 31 | #define VIRTIO_SCSI_EVENT_LEN 8 |
9141a4ca | 32 | #define VIRTIO_SCSI_VQ_BASE 2 |
4fe74b1c PB |
33 | |
34 | /* Command queue element */ | |
35 | struct virtio_scsi_cmd { | |
36 | struct scsi_cmnd *sc; | |
37 | struct completion *comp; | |
38 | union { | |
39 | struct virtio_scsi_cmd_req cmd; | |
40 | struct virtio_scsi_ctrl_tmf_req tmf; | |
41 | struct virtio_scsi_ctrl_an_req an; | |
42 | } req; | |
43 | union { | |
44 | struct virtio_scsi_cmd_resp cmd; | |
45 | struct virtio_scsi_ctrl_tmf_resp tmf; | |
46 | struct virtio_scsi_ctrl_an_resp an; | |
47 | struct virtio_scsi_event evt; | |
48 | } resp; | |
49 | } ____cacheline_aligned_in_smp; | |
50 | ||
365a7150 CM |
51 | struct virtio_scsi_event_node { |
52 | struct virtio_scsi *vscsi; | |
53 | struct virtio_scsi_event event; | |
54 | struct work_struct work; | |
55 | }; | |
56 | ||
139fe45a PB |
57 | struct virtio_scsi_vq { |
58 | /* Protects vq */ | |
59 | spinlock_t vq_lock; | |
60 | ||
61 | struct virtqueue *vq; | |
62 | }; | |
63 | ||
9141a4ca PB |
64 | /* |
65 | * Per-target queue state. | |
66 | * | |
67 | * This struct holds the data needed by the queue steering policy. When a | |
68 | * target is sent multiple requests, we need to drive them to the same queue so | |
69 | * that FIFO processing order is kept. However, if a target was idle, we can | |
70 | * choose a queue arbitrarily. In this case the queue is chosen according to | |
71 | * the current VCPU, so the driver expects the number of request queues to be | |
72 | * equal to the number of VCPUs. This makes it easy and fast to select the | |
73 | * queue, and also lets the driver optimize the IRQ affinity for the virtqueues | |
74 | * (each virtqueue's affinity is set to the CPU that "owns" the queue). | |
75 | * | |
76 | * An interesting effect of this policy is that only writes to req_vq need to | |
77 | * take the tgt_lock. Read can be done outside the lock because: | |
78 | * | |
79 | * - writes of req_vq only occur when atomic_inc_return(&tgt->reqs) returns 1. | |
80 | * In that case, no other CPU is reading req_vq: even if they were in | |
81 | * virtscsi_queuecommand_multi, they would be spinning on tgt_lock. | |
82 | * | |
83 | * - reads of req_vq only occur when the target is not idle (reqs != 0). | |
84 | * A CPU that enters virtscsi_queuecommand_multi will not modify req_vq. | |
85 | * | |
86 | * Similarly, decrements of reqs are never concurrent with writes of req_vq. | |
87 | * Thus they can happen outside the tgt_lock, provided of course we make reqs | |
88 | * an atomic_t. | |
89 | */ | |
2bd37f0f | 90 | struct virtio_scsi_target_state { |
9141a4ca | 91 | /* This spinlock never held at the same time as vq_lock. */ |
2bd37f0f | 92 | spinlock_t tgt_lock; |
9141a4ca PB |
93 | |
94 | /* Count of outstanding requests. */ | |
95 | atomic_t reqs; | |
96 | ||
97 | /* Currently active virtqueue for requests sent to this target. */ | |
98 | struct virtio_scsi_vq *req_vq; | |
2bd37f0f PB |
99 | }; |
100 | ||
4fe74b1c PB |
101 | /* Driver instance state */ |
102 | struct virtio_scsi { | |
4fe74b1c | 103 | struct virtio_device *vdev; |
2bd37f0f | 104 | |
365a7150 CM |
105 | /* Get some buffers ready for event vq */ |
106 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
9141a4ca PB |
107 | |
108 | u32 num_queues; | |
109 | ||
110 | /* If the affinity hint is set for virtqueues */ | |
111 | bool affinity_hint_set; | |
112 | ||
285e71ea WG |
113 | /* CPU hotplug notifier */ |
114 | struct notifier_block nb; | |
115 | ||
9141a4ca PB |
116 | struct virtio_scsi_vq ctrl_vq; |
117 | struct virtio_scsi_vq event_vq; | |
118 | struct virtio_scsi_vq req_vqs[]; | |
4fe74b1c PB |
119 | }; |
120 | ||
121 | static struct kmem_cache *virtscsi_cmd_cache; | |
122 | static mempool_t *virtscsi_cmd_pool; | |
123 | ||
124 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
125 | { | |
126 | return vdev->priv; | |
127 | } | |
128 | ||
129 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
130 | { | |
131 | if (!resid) | |
132 | return; | |
133 | ||
134 | if (!scsi_bidi_cmnd(sc)) { | |
135 | scsi_set_resid(sc, resid); | |
136 | return; | |
137 | } | |
138 | ||
139 | scsi_in(sc)->resid = min(resid, scsi_in(sc)->length); | |
140 | scsi_out(sc)->resid = resid - scsi_in(sc)->resid; | |
141 | } | |
142 | ||
143 | /** | |
144 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
145 | * | |
146 | * Called with vq_lock held. | |
147 | */ | |
7f82b3c9 | 148 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
149 | { |
150 | struct virtio_scsi_cmd *cmd = buf; | |
151 | struct scsi_cmnd *sc = cmd->sc; | |
152 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
9141a4ca PB |
153 | struct virtio_scsi_target_state *tgt = |
154 | scsi_target(sc->device)->hostdata; | |
4fe74b1c PB |
155 | |
156 | dev_dbg(&sc->device->sdev_gendev, | |
157 | "cmd %p response %u status %#02x sense_len %u\n", | |
158 | sc, resp->response, resp->status, resp->sense_len); | |
159 | ||
160 | sc->result = resp->status; | |
161 | virtscsi_compute_resid(sc, resp->resid); | |
162 | switch (resp->response) { | |
163 | case VIRTIO_SCSI_S_OK: | |
164 | set_host_byte(sc, DID_OK); | |
165 | break; | |
166 | case VIRTIO_SCSI_S_OVERRUN: | |
167 | set_host_byte(sc, DID_ERROR); | |
168 | break; | |
169 | case VIRTIO_SCSI_S_ABORTED: | |
170 | set_host_byte(sc, DID_ABORT); | |
171 | break; | |
172 | case VIRTIO_SCSI_S_BAD_TARGET: | |
173 | set_host_byte(sc, DID_BAD_TARGET); | |
174 | break; | |
175 | case VIRTIO_SCSI_S_RESET: | |
176 | set_host_byte(sc, DID_RESET); | |
177 | break; | |
178 | case VIRTIO_SCSI_S_BUSY: | |
179 | set_host_byte(sc, DID_BUS_BUSY); | |
180 | break; | |
181 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
182 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
183 | break; | |
184 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
185 | set_host_byte(sc, DID_TARGET_FAILURE); | |
186 | break; | |
187 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
188 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
189 | break; | |
190 | default: | |
191 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
192 | resp->response); | |
193 | /* fall through */ | |
194 | case VIRTIO_SCSI_S_FAILURE: | |
195 | set_host_byte(sc, DID_ERROR); | |
196 | break; | |
197 | } | |
198 | ||
199 | WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE); | |
200 | if (sc->sense_buffer) { | |
201 | memcpy(sc->sense_buffer, resp->sense, | |
202 | min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE)); | |
203 | if (resp->sense_len) | |
204 | set_driver_byte(sc, DRIVER_SENSE); | |
205 | } | |
206 | ||
207 | mempool_free(cmd, virtscsi_cmd_pool); | |
208 | sc->scsi_done(sc); | |
9141a4ca PB |
209 | |
210 | atomic_dec(&tgt->reqs); | |
4fe74b1c PB |
211 | } |
212 | ||
10f34f64 PB |
213 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
214 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 215 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 216 | { |
4fe74b1c | 217 | void *buf; |
4fe74b1c | 218 | unsigned int len; |
10f34f64 PB |
219 | unsigned long flags; |
220 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 221 | |
10f34f64 | 222 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
223 | do { |
224 | virtqueue_disable_cb(vq); | |
225 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 226 | fn(vscsi, buf); |
2bf4fd31 HG |
227 | |
228 | if (unlikely(virtqueue_is_broken(vq))) | |
229 | break; | |
4fe74b1c | 230 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 231 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
232 | } |
233 | ||
234 | static void virtscsi_req_done(struct virtqueue *vq) | |
235 | { | |
139fe45a PB |
236 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
237 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
238 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
239 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
240 | ||
241 | /* | |
242 | * Read req_vq before decrementing the reqs field in | |
243 | * virtscsi_complete_cmd. | |
244 | * | |
245 | * With barriers: | |
246 | * | |
247 | * CPU #0 virtscsi_queuecommand_multi (CPU #1) | |
248 | * ------------------------------------------------------------ | |
249 | * lock vq_lock | |
250 | * read req_vq | |
251 | * read reqs (reqs = 1) | |
252 | * write reqs (reqs = 0) | |
253 | * increment reqs (reqs = 1) | |
254 | * write req_vq | |
255 | * | |
256 | * Possible reordering without barriers: | |
257 | * | |
258 | * CPU #0 virtscsi_queuecommand_multi (CPU #1) | |
259 | * ------------------------------------------------------------ | |
260 | * lock vq_lock | |
261 | * read reqs (reqs = 1) | |
262 | * write reqs (reqs = 0) | |
263 | * increment reqs (reqs = 1) | |
264 | * write req_vq | |
265 | * read (wrong) req_vq | |
266 | * | |
267 | * We do not need a full smp_rmb, because req_vq is required to get | |
268 | * to tgt->reqs: tgt is &vscsi->tgt[sc->device->id], where sc is stored | |
269 | * in the virtqueue as the user token. | |
270 | */ | |
271 | smp_read_barrier_depends(); | |
272 | ||
273 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); | |
4fe74b1c PB |
274 | }; |
275 | ||
7f82b3c9 | 276 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
277 | { |
278 | struct virtio_scsi_cmd *cmd = buf; | |
279 | ||
280 | if (cmd->comp) | |
281 | complete_all(cmd->comp); | |
e4594bb5 PB |
282 | else |
283 | mempool_free(cmd, virtscsi_cmd_pool); | |
4fe74b1c PB |
284 | } |
285 | ||
286 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
287 | { | |
139fe45a PB |
288 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
289 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 290 | |
10f34f64 | 291 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
292 | }; |
293 | ||
365a7150 CM |
294 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
295 | struct virtio_scsi_event_node *event_node) | |
296 | { | |
4614e51c | 297 | int err; |
365a7150 CM |
298 | struct scatterlist sg; |
299 | unsigned long flags; | |
300 | ||
2e9c9dfd | 301 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
302 | |
303 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
304 | ||
bf958291 RR |
305 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
306 | GFP_ATOMIC); | |
4614e51c | 307 | if (!err) |
365a7150 CM |
308 | virtqueue_kick(vscsi->event_vq.vq); |
309 | ||
310 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
311 | ||
4614e51c | 312 | return err; |
365a7150 CM |
313 | } |
314 | ||
315 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
316 | { | |
317 | int i; | |
318 | ||
319 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
320 | vscsi->event_list[i].vscsi = vscsi; | |
321 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
322 | } | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
328 | { | |
329 | int i; | |
330 | ||
331 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) | |
332 | cancel_work_sync(&vscsi->event_list[i].work); | |
333 | } | |
334 | ||
335 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 336 | struct virtio_scsi_event *event) |
365a7150 CM |
337 | { |
338 | struct scsi_device *sdev; | |
339 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
340 | unsigned int target = event->lun[1]; | |
341 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
342 | ||
343 | switch (event->reason) { | |
344 | case VIRTIO_SCSI_EVT_RESET_RESCAN: | |
345 | scsi_add_device(shost, 0, target, lun); | |
346 | break; | |
347 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
348 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
349 | if (sdev) { | |
350 | scsi_remove_device(sdev); | |
351 | scsi_device_put(sdev); | |
352 | } else { | |
353 | pr_err("SCSI device %d 0 %d %d not found\n", | |
354 | shost->host_no, target, lun); | |
355 | } | |
356 | break; | |
357 | default: | |
358 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
359 | } | |
360 | } | |
361 | ||
865b58c0 PB |
362 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
363 | struct virtio_scsi_event *event) | |
364 | { | |
365 | struct scsi_device *sdev; | |
366 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
367 | unsigned int target = event->lun[1]; | |
368 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
369 | u8 asc = event->reason & 255; | |
370 | u8 ascq = event->reason >> 8; | |
371 | ||
372 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
373 | if (!sdev) { | |
374 | pr_err("SCSI device %d 0 %d %d not found\n", | |
375 | shost->host_no, target, lun); | |
376 | return; | |
377 | } | |
378 | ||
379 | /* Handle "Parameters changed", "Mode parameters changed", and | |
380 | "Capacity data has changed". */ | |
381 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
382 | scsi_rescan_device(&sdev->sdev_gendev); | |
383 | ||
384 | scsi_device_put(sdev); | |
385 | } | |
386 | ||
365a7150 CM |
387 | static void virtscsi_handle_event(struct work_struct *work) |
388 | { | |
389 | struct virtio_scsi_event_node *event_node = | |
390 | container_of(work, struct virtio_scsi_event_node, work); | |
391 | struct virtio_scsi *vscsi = event_node->vscsi; | |
392 | struct virtio_scsi_event *event = &event_node->event; | |
393 | ||
394 | if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) { | |
395 | event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED; | |
396 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); | |
397 | } | |
398 | ||
399 | switch (event->event) { | |
400 | case VIRTIO_SCSI_T_NO_EVENT: | |
401 | break; | |
402 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
403 | virtscsi_handle_transport_reset(vscsi, event); | |
404 | break; | |
865b58c0 PB |
405 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
406 | virtscsi_handle_param_change(vscsi, event); | |
407 | break; | |
365a7150 CM |
408 | default: |
409 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
410 | } | |
411 | virtscsi_kick_event(vscsi, event_node); | |
412 | } | |
413 | ||
7f82b3c9 | 414 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
415 | { |
416 | struct virtio_scsi_event_node *event_node = buf; | |
417 | ||
418 | INIT_WORK(&event_node->work, virtscsi_handle_event); | |
419 | schedule_work(&event_node->work); | |
420 | } | |
421 | ||
4fe74b1c PB |
422 | static void virtscsi_event_done(struct virtqueue *vq) |
423 | { | |
139fe45a PB |
424 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
425 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 426 | |
10f34f64 | 427 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
428 | }; |
429 | ||
4fe74b1c | 430 | /** |
682993b4 WG |
431 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue |
432 | * @vq : the struct virtqueue we're talking about | |
4fe74b1c | 433 | * @cmd : command structure |
4fe74b1c PB |
434 | * @req_size : size of the request buffer |
435 | * @resp_size : size of the response buffer | |
682993b4 | 436 | * @gfp : flags to use for memory allocations |
4fe74b1c | 437 | */ |
682993b4 WG |
438 | static int virtscsi_add_cmd(struct virtqueue *vq, |
439 | struct virtio_scsi_cmd *cmd, | |
440 | size_t req_size, size_t resp_size, gfp_t gfp) | |
4fe74b1c PB |
441 | { |
442 | struct scsi_cmnd *sc = cmd->sc; | |
682993b4 WG |
443 | struct scatterlist *sgs[4], req, resp; |
444 | struct sg_table *out, *in; | |
445 | unsigned out_num = 0, in_num = 0; | |
446 | ||
447 | out = in = NULL; | |
448 | ||
449 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
450 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
451 | out = &scsi_out(sc)->table; | |
452 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
453 | in = &scsi_in(sc)->table; | |
454 | } | |
4fe74b1c | 455 | |
4fe74b1c | 456 | /* Request header. */ |
682993b4 WG |
457 | sg_init_one(&req, &cmd->req, req_size); |
458 | sgs[out_num++] = &req; | |
4fe74b1c PB |
459 | |
460 | /* Data-out buffer. */ | |
682993b4 WG |
461 | if (out) |
462 | sgs[out_num++] = out->sgl; | |
4fe74b1c PB |
463 | |
464 | /* Response header. */ | |
682993b4 WG |
465 | sg_init_one(&resp, &cmd->resp, resp_size); |
466 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
467 | |
468 | /* Data-in buffer */ | |
682993b4 WG |
469 | if (in) |
470 | sgs[out_num + in_num++] = in->sgl; | |
4fe74b1c | 471 | |
682993b4 | 472 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, gfp); |
4fe74b1c PB |
473 | } |
474 | ||
682993b4 | 475 | static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, |
4fe74b1c PB |
476 | struct virtio_scsi_cmd *cmd, |
477 | size_t req_size, size_t resp_size, gfp_t gfp) | |
478 | { | |
4fe74b1c | 479 | unsigned long flags; |
4614e51c RR |
480 | int err; |
481 | bool needs_kick = false; | |
4fe74b1c | 482 | |
682993b4 WG |
483 | spin_lock_irqsave(&vq->vq_lock, flags); |
484 | err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size, gfp); | |
4614e51c RR |
485 | if (!err) |
486 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 487 | |
bce750b1 | 488 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 489 | |
4614e51c | 490 | if (needs_kick) |
139fe45a | 491 | virtqueue_notify(vq->vq); |
4614e51c | 492 | return err; |
4fe74b1c PB |
493 | } |
494 | ||
9141a4ca PB |
495 | static int virtscsi_queuecommand(struct virtio_scsi *vscsi, |
496 | struct virtio_scsi_vq *req_vq, | |
497 | struct scsi_cmnd *sc) | |
4fe74b1c | 498 | { |
4fe74b1c PB |
499 | struct virtio_scsi_cmd *cmd; |
500 | int ret; | |
501 | ||
2bd37f0f PB |
502 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
503 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); | |
504 | ||
505 | /* TODO: check feature bit and fail if unsupported? */ | |
506 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
507 | ||
4fe74b1c PB |
508 | dev_dbg(&sc->device->sdev_gendev, |
509 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
510 | ||
511 | ret = SCSI_MLQUEUE_HOST_BUSY; | |
512 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_ATOMIC); | |
513 | if (!cmd) | |
514 | goto out; | |
515 | ||
516 | memset(cmd, 0, sizeof(*cmd)); | |
517 | cmd->sc = sc; | |
518 | cmd->req.cmd = (struct virtio_scsi_cmd_req){ | |
519 | .lun[0] = 1, | |
520 | .lun[1] = sc->device->id, | |
521 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
522 | .lun[3] = sc->device->lun & 0xff, | |
523 | .tag = (unsigned long)sc, | |
524 | .task_attr = VIRTIO_SCSI_S_SIMPLE, | |
525 | .prio = 0, | |
526 | .crn = 0, | |
527 | }; | |
528 | ||
529 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
530 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); | |
531 | ||
9141a4ca | 532 | if (virtscsi_kick_cmd(req_vq, cmd, |
4fe74b1c | 533 | sizeof cmd->req.cmd, sizeof cmd->resp.cmd, |
4614e51c | 534 | GFP_ATOMIC) == 0) |
4fe74b1c | 535 | ret = 0; |
b56d1003 EN |
536 | else |
537 | mempool_free(cmd, virtscsi_cmd_pool); | |
4fe74b1c PB |
538 | |
539 | out: | |
540 | return ret; | |
541 | } | |
542 | ||
9141a4ca PB |
543 | static int virtscsi_queuecommand_single(struct Scsi_Host *sh, |
544 | struct scsi_cmnd *sc) | |
545 | { | |
546 | struct virtio_scsi *vscsi = shost_priv(sh); | |
547 | struct virtio_scsi_target_state *tgt = | |
548 | scsi_target(sc->device)->hostdata; | |
549 | ||
550 | atomic_inc(&tgt->reqs); | |
551 | return virtscsi_queuecommand(vscsi, &vscsi->req_vqs[0], sc); | |
552 | } | |
553 | ||
554 | static struct virtio_scsi_vq *virtscsi_pick_vq(struct virtio_scsi *vscsi, | |
555 | struct virtio_scsi_target_state *tgt) | |
556 | { | |
557 | struct virtio_scsi_vq *vq; | |
558 | unsigned long flags; | |
559 | u32 queue_num; | |
560 | ||
561 | spin_lock_irqsave(&tgt->tgt_lock, flags); | |
562 | ||
563 | /* | |
564 | * The memory barrier after atomic_inc_return matches | |
565 | * the smp_read_barrier_depends() in virtscsi_req_done. | |
566 | */ | |
567 | if (atomic_inc_return(&tgt->reqs) > 1) | |
568 | vq = ACCESS_ONCE(tgt->req_vq); | |
569 | else { | |
570 | queue_num = smp_processor_id(); | |
571 | while (unlikely(queue_num >= vscsi->num_queues)) | |
572 | queue_num -= vscsi->num_queues; | |
573 | ||
574 | tgt->req_vq = vq = &vscsi->req_vqs[queue_num]; | |
575 | } | |
576 | ||
577 | spin_unlock_irqrestore(&tgt->tgt_lock, flags); | |
578 | return vq; | |
579 | } | |
580 | ||
581 | static int virtscsi_queuecommand_multi(struct Scsi_Host *sh, | |
582 | struct scsi_cmnd *sc) | |
583 | { | |
584 | struct virtio_scsi *vscsi = shost_priv(sh); | |
585 | struct virtio_scsi_target_state *tgt = | |
586 | scsi_target(sc->device)->hostdata; | |
587 | struct virtio_scsi_vq *req_vq = virtscsi_pick_vq(vscsi, tgt); | |
588 | ||
589 | return virtscsi_queuecommand(vscsi, req_vq, sc); | |
590 | } | |
591 | ||
4fe74b1c PB |
592 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) |
593 | { | |
594 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 595 | int ret = FAILED; |
4fe74b1c PB |
596 | |
597 | cmd->comp = ∁ | |
682993b4 | 598 | if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd, |
e4594bb5 PB |
599 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf, |
600 | GFP_NOIO) < 0) | |
601 | goto out; | |
4fe74b1c PB |
602 | |
603 | wait_for_completion(&comp); | |
e4594bb5 PB |
604 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
605 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
606 | ret = SUCCESS; | |
4fe74b1c | 607 | |
e4594bb5 PB |
608 | out: |
609 | mempool_free(cmd, virtscsi_cmd_pool); | |
610 | return ret; | |
4fe74b1c PB |
611 | } |
612 | ||
613 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
614 | { | |
615 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
616 | struct virtio_scsi_cmd *cmd; | |
617 | ||
618 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
619 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
620 | if (!cmd) | |
621 | return FAILED; | |
622 | ||
623 | memset(cmd, 0, sizeof(*cmd)); | |
624 | cmd->sc = sc; | |
625 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
626 | .type = VIRTIO_SCSI_T_TMF, | |
627 | .subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET, | |
628 | .lun[0] = 1, | |
629 | .lun[1] = sc->device->id, | |
630 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
631 | .lun[3] = sc->device->lun & 0xff, | |
632 | }; | |
633 | return virtscsi_tmf(vscsi, cmd); | |
634 | } | |
635 | ||
636 | static int virtscsi_abort(struct scsi_cmnd *sc) | |
637 | { | |
638 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
639 | struct virtio_scsi_cmd *cmd; | |
640 | ||
641 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
642 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
643 | if (!cmd) | |
644 | return FAILED; | |
645 | ||
646 | memset(cmd, 0, sizeof(*cmd)); | |
647 | cmd->sc = sc; | |
648 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
649 | .type = VIRTIO_SCSI_T_TMF, | |
650 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
651 | .lun[0] = 1, | |
652 | .lun[1] = sc->device->id, | |
653 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
654 | .lun[3] = sc->device->lun & 0xff, | |
655 | .tag = (unsigned long)sc, | |
656 | }; | |
657 | return virtscsi_tmf(vscsi, cmd); | |
658 | } | |
659 | ||
5c370194 WG |
660 | static int virtscsi_target_alloc(struct scsi_target *starget) |
661 | { | |
662 | struct virtio_scsi_target_state *tgt = | |
663 | kmalloc(sizeof(*tgt), GFP_KERNEL); | |
664 | if (!tgt) | |
665 | return -ENOMEM; | |
666 | ||
667 | spin_lock_init(&tgt->tgt_lock); | |
9141a4ca PB |
668 | atomic_set(&tgt->reqs, 0); |
669 | tgt->req_vq = NULL; | |
5c370194 WG |
670 | |
671 | starget->hostdata = tgt; | |
672 | return 0; | |
673 | } | |
674 | ||
675 | static void virtscsi_target_destroy(struct scsi_target *starget) | |
676 | { | |
677 | struct virtio_scsi_target_state *tgt = starget->hostdata; | |
678 | kfree(tgt); | |
679 | } | |
680 | ||
9141a4ca PB |
681 | static struct scsi_host_template virtscsi_host_template_single = { |
682 | .module = THIS_MODULE, | |
683 | .name = "Virtio SCSI HBA", | |
684 | .proc_name = "virtio_scsi", | |
685 | .this_id = -1, | |
686 | .queuecommand = virtscsi_queuecommand_single, | |
687 | .eh_abort_handler = virtscsi_abort, | |
688 | .eh_device_reset_handler = virtscsi_device_reset, | |
689 | ||
690 | .can_queue = 1024, | |
691 | .dma_boundary = UINT_MAX, | |
692 | .use_clustering = ENABLE_CLUSTERING, | |
693 | .target_alloc = virtscsi_target_alloc, | |
694 | .target_destroy = virtscsi_target_destroy, | |
695 | }; | |
696 | ||
697 | static struct scsi_host_template virtscsi_host_template_multi = { | |
4fe74b1c PB |
698 | .module = THIS_MODULE, |
699 | .name = "Virtio SCSI HBA", | |
700 | .proc_name = "virtio_scsi", | |
4fe74b1c | 701 | .this_id = -1, |
9141a4ca | 702 | .queuecommand = virtscsi_queuecommand_multi, |
4fe74b1c PB |
703 | .eh_abort_handler = virtscsi_abort, |
704 | .eh_device_reset_handler = virtscsi_device_reset, | |
705 | ||
706 | .can_queue = 1024, | |
707 | .dma_boundary = UINT_MAX, | |
708 | .use_clustering = ENABLE_CLUSTERING, | |
5c370194 WG |
709 | .target_alloc = virtscsi_target_alloc, |
710 | .target_destroy = virtscsi_target_destroy, | |
4fe74b1c PB |
711 | }; |
712 | ||
713 | #define virtscsi_config_get(vdev, fld) \ | |
714 | ({ \ | |
715 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
855e0c52 | 716 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
717 | __val; \ |
718 | }) | |
719 | ||
720 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 721 | do { \ |
4fe74b1c | 722 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ |
855e0c52 RR |
723 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
724 | } while(0) | |
4fe74b1c | 725 | |
9141a4ca PB |
726 | static void __virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) |
727 | { | |
728 | int i; | |
729 | int cpu; | |
730 | ||
731 | /* In multiqueue mode, when the number of cpu is equal | |
732 | * to the number of request queues, we let the qeueues | |
733 | * to be private to one cpu by setting the affinity hint | |
734 | * to eliminate the contention. | |
735 | */ | |
736 | if ((vscsi->num_queues == 1 || | |
737 | vscsi->num_queues != num_online_cpus()) && affinity) { | |
738 | if (vscsi->affinity_hint_set) | |
739 | affinity = false; | |
740 | else | |
741 | return; | |
742 | } | |
743 | ||
744 | if (affinity) { | |
745 | i = 0; | |
746 | for_each_online_cpu(cpu) { | |
747 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, cpu); | |
748 | i++; | |
749 | } | |
750 | ||
751 | vscsi->affinity_hint_set = true; | |
752 | } else { | |
aa52aeea | 753 | for (i = 0; i < vscsi->num_queues; i++) |
9141a4ca PB |
754 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, -1); |
755 | ||
756 | vscsi->affinity_hint_set = false; | |
757 | } | |
758 | } | |
759 | ||
760 | static void virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) | |
761 | { | |
762 | get_online_cpus(); | |
763 | __virtscsi_set_affinity(vscsi, affinity); | |
764 | put_online_cpus(); | |
765 | } | |
766 | ||
285e71ea WG |
767 | static int virtscsi_cpu_callback(struct notifier_block *nfb, |
768 | unsigned long action, void *hcpu) | |
769 | { | |
770 | struct virtio_scsi *vscsi = container_of(nfb, struct virtio_scsi, nb); | |
771 | switch(action) { | |
772 | case CPU_ONLINE: | |
773 | case CPU_ONLINE_FROZEN: | |
774 | case CPU_DEAD: | |
775 | case CPU_DEAD_FROZEN: | |
776 | __virtscsi_set_affinity(vscsi, true); | |
777 | break; | |
778 | default: | |
779 | break; | |
780 | } | |
781 | return NOTIFY_OK; | |
782 | } | |
783 | ||
139fe45a PB |
784 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
785 | struct virtqueue *vq) | |
786 | { | |
787 | spin_lock_init(&virtscsi_vq->vq_lock); | |
788 | virtscsi_vq->vq = vq; | |
789 | } | |
790 | ||
59057fbc NB |
791 | static void virtscsi_scan(struct virtio_device *vdev) |
792 | { | |
793 | struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv; | |
794 | ||
795 | scsi_scan_host(shost); | |
796 | } | |
797 | ||
2bd37f0f PB |
798 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
799 | { | |
9141a4ca PB |
800 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
801 | struct virtio_scsi *vscsi = shost_priv(sh); | |
802 | ||
803 | virtscsi_set_affinity(vscsi, false); | |
804 | ||
2bd37f0f PB |
805 | /* Stop all the virtqueues. */ |
806 | vdev->config->reset(vdev); | |
807 | ||
2bd37f0f PB |
808 | vdev->config->del_vqs(vdev); |
809 | } | |
810 | ||
4fe74b1c | 811 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 812 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
813 | { |
814 | int err; | |
9141a4ca PB |
815 | u32 i; |
816 | u32 num_vqs; | |
817 | vq_callback_t **callbacks; | |
818 | const char **names; | |
819 | struct virtqueue **vqs; | |
820 | ||
821 | num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE; | |
822 | vqs = kmalloc(num_vqs * sizeof(struct virtqueue *), GFP_KERNEL); | |
823 | callbacks = kmalloc(num_vqs * sizeof(vq_callback_t *), GFP_KERNEL); | |
824 | names = kmalloc(num_vqs * sizeof(char *), GFP_KERNEL); | |
825 | ||
826 | if (!callbacks || !vqs || !names) { | |
827 | err = -ENOMEM; | |
828 | goto out; | |
829 | } | |
2bd37f0f | 830 | |
9141a4ca PB |
831 | callbacks[0] = virtscsi_ctrl_done; |
832 | callbacks[1] = virtscsi_event_done; | |
833 | names[0] = "control"; | |
834 | names[1] = "event"; | |
835 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) { | |
836 | callbacks[i] = virtscsi_req_done; | |
837 | names[i] = "request"; | |
838 | } | |
4fe74b1c PB |
839 | |
840 | /* Discover virtqueues and write information to configuration. */ | |
9141a4ca | 841 | err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names); |
4fe74b1c | 842 | if (err) |
9141a4ca | 843 | goto out; |
4fe74b1c | 844 | |
139fe45a PB |
845 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
846 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
847 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
848 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
849 | vqs[i]); | |
850 | ||
851 | virtscsi_set_affinity(vscsi, true); | |
4fe74b1c PB |
852 | |
853 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); | |
854 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 855 | |
365a7150 CM |
856 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
857 | virtscsi_kick_event_all(vscsi); | |
858 | ||
9141a4ca PB |
859 | err = 0; |
860 | ||
861 | out: | |
862 | kfree(names); | |
863 | kfree(callbacks); | |
864 | kfree(vqs); | |
865 | if (err) | |
866 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 867 | return err; |
4fe74b1c PB |
868 | } |
869 | ||
6f039790 | 870 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
871 | { |
872 | struct Scsi_Host *shost; | |
873 | struct virtio_scsi *vscsi; | |
874 | int err; | |
2bd37f0f | 875 | u32 sg_elems, num_targets; |
4fe74b1c | 876 | u32 cmd_per_lun; |
9141a4ca PB |
877 | u32 num_queues; |
878 | struct scsi_host_template *hostt; | |
879 | ||
880 | /* We need to know how many queues before we allocate. */ | |
881 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
4fe74b1c | 882 | |
2bd37f0f | 883 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 884 | |
9141a4ca PB |
885 | if (num_queues == 1) |
886 | hostt = &virtscsi_host_template_single; | |
887 | else | |
888 | hostt = &virtscsi_host_template_multi; | |
889 | ||
890 | shost = scsi_host_alloc(hostt, | |
891 | sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues); | |
4fe74b1c PB |
892 | if (!shost) |
893 | return -ENOMEM; | |
894 | ||
2bd37f0f | 895 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
896 | shost->sg_tablesize = sg_elems; |
897 | vscsi = shost_priv(shost); | |
898 | vscsi->vdev = vdev; | |
9141a4ca | 899 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
900 | vdev->priv = shost; |
901 | ||
5c370194 | 902 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
903 | if (err) |
904 | goto virtscsi_init_failed; | |
905 | ||
285e71ea WG |
906 | vscsi->nb.notifier_call = &virtscsi_cpu_callback; |
907 | err = register_hotcpu_notifier(&vscsi->nb); | |
908 | if (err) { | |
909 | pr_err("registering cpu notifier failed\n"); | |
910 | goto scsi_add_host_failed; | |
911 | } | |
912 | ||
4fe74b1c PB |
913 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
914 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
915 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
916 | |
917 | /* LUNs > 256 are reported with format 1, so they go in the range | |
918 | * 16640-32767. | |
919 | */ | |
920 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 921 | shost->max_id = num_targets; |
4fe74b1c PB |
922 | shost->max_channel = 0; |
923 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
924 | err = scsi_add_host(shost, &vdev->dev); | |
925 | if (err) | |
926 | goto scsi_add_host_failed; | |
59057fbc NB |
927 | /* |
928 | * scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan() | |
929 | * after VIRTIO_CONFIG_S_DRIVER_OK has been set.. | |
930 | */ | |
4fe74b1c PB |
931 | return 0; |
932 | ||
933 | scsi_add_host_failed: | |
934 | vdev->config->del_vqs(vdev); | |
935 | virtscsi_init_failed: | |
936 | scsi_host_put(shost); | |
937 | return err; | |
938 | } | |
939 | ||
6f039790 | 940 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
941 | { |
942 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
943 | struct virtio_scsi *vscsi = shost_priv(shost); |
944 | ||
945 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
946 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
947 | |
948 | scsi_remove_host(shost); | |
949 | ||
285e71ea WG |
950 | unregister_hotcpu_notifier(&vscsi->nb); |
951 | ||
4fe74b1c PB |
952 | virtscsi_remove_vqs(vdev); |
953 | scsi_host_put(shost); | |
954 | } | |
955 | ||
89107000 | 956 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
957 | static int virtscsi_freeze(struct virtio_device *vdev) |
958 | { | |
959 | virtscsi_remove_vqs(vdev); | |
960 | return 0; | |
961 | } | |
962 | ||
963 | static int virtscsi_restore(struct virtio_device *vdev) | |
964 | { | |
965 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
966 | struct virtio_scsi *vscsi = shost_priv(sh); | |
967 | ||
5c370194 | 968 | return virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
969 | } |
970 | #endif | |
971 | ||
972 | static struct virtio_device_id id_table[] = { | |
973 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
974 | { 0 }, | |
975 | }; | |
976 | ||
365a7150 | 977 | static unsigned int features[] = { |
865b58c0 PB |
978 | VIRTIO_SCSI_F_HOTPLUG, |
979 | VIRTIO_SCSI_F_CHANGE, | |
365a7150 CM |
980 | }; |
981 | ||
4fe74b1c | 982 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
983 | .feature_table = features, |
984 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
985 | .driver.name = KBUILD_MODNAME, |
986 | .driver.owner = THIS_MODULE, | |
987 | .id_table = id_table, | |
988 | .probe = virtscsi_probe, | |
59057fbc | 989 | .scan = virtscsi_scan, |
89107000 | 990 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
991 | .freeze = virtscsi_freeze, |
992 | .restore = virtscsi_restore, | |
993 | #endif | |
6f039790 | 994 | .remove = virtscsi_remove, |
4fe74b1c PB |
995 | }; |
996 | ||
997 | static int __init init(void) | |
998 | { | |
999 | int ret = -ENOMEM; | |
1000 | ||
1001 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
1002 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 1003 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
1004 | goto error; |
1005 | } | |
1006 | ||
1007 | ||
1008 | virtscsi_cmd_pool = | |
1009 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
1010 | virtscsi_cmd_cache); | |
1011 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 1012 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
1013 | goto error; |
1014 | } | |
1015 | ret = register_virtio_driver(&virtio_scsi_driver); | |
1016 | if (ret < 0) | |
1017 | goto error; | |
1018 | ||
1019 | return 0; | |
1020 | ||
1021 | error: | |
1022 | if (virtscsi_cmd_pool) { | |
1023 | mempool_destroy(virtscsi_cmd_pool); | |
1024 | virtscsi_cmd_pool = NULL; | |
1025 | } | |
1026 | if (virtscsi_cmd_cache) { | |
1027 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1028 | virtscsi_cmd_cache = NULL; | |
1029 | } | |
1030 | return ret; | |
1031 | } | |
1032 | ||
1033 | static void __exit fini(void) | |
1034 | { | |
1035 | unregister_virtio_driver(&virtio_scsi_driver); | |
1036 | mempool_destroy(virtscsi_cmd_pool); | |
1037 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1038 | } | |
1039 | module_init(init); | |
1040 | module_exit(fini); | |
1041 | ||
1042 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1043 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
1044 | MODULE_LICENSE("GPL"); |