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> | |
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 | * | |
f259d9bd ML |
76 | * tgt_lock is held to serialize reading and writing req_vq. Reading req_vq |
77 | * could be done locklessly, but we do not do it yet. | |
9141a4ca | 78 | * |
f259d9bd ML |
79 | * Decrements of reqs are never concurrent with writes of req_vq: before the |
80 | * decrement reqs will be != 0; after the decrement the virtqueue completion | |
81 | * routine will not use the req_vq so it can be changed by a new request. | |
9141a4ca PB |
82 | * Thus they can happen outside the tgt_lock, provided of course we make reqs |
83 | * an atomic_t. | |
84 | */ | |
2bd37f0f | 85 | struct virtio_scsi_target_state { |
9141a4ca | 86 | /* This spinlock never held at the same time as vq_lock. */ |
2bd37f0f | 87 | spinlock_t tgt_lock; |
9141a4ca PB |
88 | |
89 | /* Count of outstanding requests. */ | |
90 | atomic_t reqs; | |
91 | ||
92 | /* Currently active virtqueue for requests sent to this target. */ | |
93 | struct virtio_scsi_vq *req_vq; | |
2bd37f0f PB |
94 | }; |
95 | ||
4fe74b1c PB |
96 | /* Driver instance state */ |
97 | struct virtio_scsi { | |
4fe74b1c | 98 | struct virtio_device *vdev; |
2bd37f0f | 99 | |
365a7150 CM |
100 | /* Get some buffers ready for event vq */ |
101 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
9141a4ca PB |
102 | |
103 | u32 num_queues; | |
104 | ||
105 | /* If the affinity hint is set for virtqueues */ | |
106 | bool affinity_hint_set; | |
107 | ||
285e71ea WG |
108 | /* CPU hotplug notifier */ |
109 | struct notifier_block nb; | |
110 | ||
9141a4ca PB |
111 | struct virtio_scsi_vq ctrl_vq; |
112 | struct virtio_scsi_vq event_vq; | |
113 | struct virtio_scsi_vq req_vqs[]; | |
4fe74b1c PB |
114 | }; |
115 | ||
116 | static struct kmem_cache *virtscsi_cmd_cache; | |
117 | static mempool_t *virtscsi_cmd_pool; | |
118 | ||
119 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
120 | { | |
121 | return vdev->priv; | |
122 | } | |
123 | ||
124 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
125 | { | |
126 | if (!resid) | |
127 | return; | |
128 | ||
129 | if (!scsi_bidi_cmnd(sc)) { | |
130 | scsi_set_resid(sc, resid); | |
131 | return; | |
132 | } | |
133 | ||
134 | scsi_in(sc)->resid = min(resid, scsi_in(sc)->length); | |
135 | scsi_out(sc)->resid = resid - scsi_in(sc)->resid; | |
136 | } | |
137 | ||
138 | /** | |
139 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
140 | * | |
141 | * Called with vq_lock held. | |
142 | */ | |
7f82b3c9 | 143 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
144 | { |
145 | struct virtio_scsi_cmd *cmd = buf; | |
146 | struct scsi_cmnd *sc = cmd->sc; | |
147 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
9141a4ca PB |
148 | struct virtio_scsi_target_state *tgt = |
149 | scsi_target(sc->device)->hostdata; | |
4fe74b1c PB |
150 | |
151 | dev_dbg(&sc->device->sdev_gendev, | |
152 | "cmd %p response %u status %#02x sense_len %u\n", | |
153 | sc, resp->response, resp->status, resp->sense_len); | |
154 | ||
155 | sc->result = resp->status; | |
156 | virtscsi_compute_resid(sc, resp->resid); | |
157 | switch (resp->response) { | |
158 | case VIRTIO_SCSI_S_OK: | |
159 | set_host_byte(sc, DID_OK); | |
160 | break; | |
161 | case VIRTIO_SCSI_S_OVERRUN: | |
162 | set_host_byte(sc, DID_ERROR); | |
163 | break; | |
164 | case VIRTIO_SCSI_S_ABORTED: | |
165 | set_host_byte(sc, DID_ABORT); | |
166 | break; | |
167 | case VIRTIO_SCSI_S_BAD_TARGET: | |
168 | set_host_byte(sc, DID_BAD_TARGET); | |
169 | break; | |
170 | case VIRTIO_SCSI_S_RESET: | |
171 | set_host_byte(sc, DID_RESET); | |
172 | break; | |
173 | case VIRTIO_SCSI_S_BUSY: | |
174 | set_host_byte(sc, DID_BUS_BUSY); | |
175 | break; | |
176 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
177 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
178 | break; | |
179 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
180 | set_host_byte(sc, DID_TARGET_FAILURE); | |
181 | break; | |
182 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
183 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
184 | break; | |
185 | default: | |
186 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
187 | resp->response); | |
188 | /* fall through */ | |
189 | case VIRTIO_SCSI_S_FAILURE: | |
190 | set_host_byte(sc, DID_ERROR); | |
191 | break; | |
192 | } | |
193 | ||
194 | WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE); | |
195 | if (sc->sense_buffer) { | |
196 | memcpy(sc->sense_buffer, resp->sense, | |
197 | min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE)); | |
198 | if (resp->sense_len) | |
199 | set_driver_byte(sc, DRIVER_SENSE); | |
200 | } | |
201 | ||
4fe74b1c | 202 | sc->scsi_done(sc); |
9141a4ca PB |
203 | |
204 | atomic_dec(&tgt->reqs); | |
4fe74b1c PB |
205 | } |
206 | ||
10f34f64 PB |
207 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
208 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 209 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 210 | { |
4fe74b1c | 211 | void *buf; |
4fe74b1c | 212 | unsigned int len; |
10f34f64 PB |
213 | unsigned long flags; |
214 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 215 | |
10f34f64 | 216 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
217 | do { |
218 | virtqueue_disable_cb(vq); | |
219 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 220 | fn(vscsi, buf); |
2bf4fd31 HG |
221 | |
222 | if (unlikely(virtqueue_is_broken(vq))) | |
223 | break; | |
4fe74b1c | 224 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 225 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
226 | } |
227 | ||
228 | static void virtscsi_req_done(struct virtqueue *vq) | |
229 | { | |
139fe45a PB |
230 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
231 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
232 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
233 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
234 | ||
9141a4ca | 235 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); |
4fe74b1c PB |
236 | }; |
237 | ||
7f82b3c9 | 238 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
239 | { |
240 | struct virtio_scsi_cmd *cmd = buf; | |
241 | ||
242 | if (cmd->comp) | |
243 | complete_all(cmd->comp); | |
4fe74b1c PB |
244 | } |
245 | ||
246 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
247 | { | |
139fe45a PB |
248 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
249 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 250 | |
10f34f64 | 251 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
252 | }; |
253 | ||
365a7150 CM |
254 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
255 | struct virtio_scsi_event_node *event_node) | |
256 | { | |
4614e51c | 257 | int err; |
365a7150 CM |
258 | struct scatterlist sg; |
259 | unsigned long flags; | |
260 | ||
2e9c9dfd | 261 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
262 | |
263 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
264 | ||
bf958291 RR |
265 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
266 | GFP_ATOMIC); | |
4614e51c | 267 | if (!err) |
365a7150 CM |
268 | virtqueue_kick(vscsi->event_vq.vq); |
269 | ||
270 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
271 | ||
4614e51c | 272 | return err; |
365a7150 CM |
273 | } |
274 | ||
275 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
276 | { | |
277 | int i; | |
278 | ||
279 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
280 | vscsi->event_list[i].vscsi = vscsi; | |
281 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
288 | { | |
289 | int i; | |
290 | ||
291 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) | |
292 | cancel_work_sync(&vscsi->event_list[i].work); | |
293 | } | |
294 | ||
295 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 296 | struct virtio_scsi_event *event) |
365a7150 CM |
297 | { |
298 | struct scsi_device *sdev; | |
299 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
300 | unsigned int target = event->lun[1]; | |
301 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
302 | ||
303 | switch (event->reason) { | |
304 | case VIRTIO_SCSI_EVT_RESET_RESCAN: | |
305 | scsi_add_device(shost, 0, target, lun); | |
306 | break; | |
307 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
308 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
309 | if (sdev) { | |
310 | scsi_remove_device(sdev); | |
311 | scsi_device_put(sdev); | |
312 | } else { | |
313 | pr_err("SCSI device %d 0 %d %d not found\n", | |
314 | shost->host_no, target, lun); | |
315 | } | |
316 | break; | |
317 | default: | |
318 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
319 | } | |
320 | } | |
321 | ||
865b58c0 PB |
322 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
323 | struct virtio_scsi_event *event) | |
324 | { | |
325 | struct scsi_device *sdev; | |
326 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
327 | unsigned int target = event->lun[1]; | |
328 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
329 | u8 asc = event->reason & 255; | |
330 | u8 ascq = event->reason >> 8; | |
331 | ||
332 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
333 | if (!sdev) { | |
334 | pr_err("SCSI device %d 0 %d %d not found\n", | |
335 | shost->host_no, target, lun); | |
336 | return; | |
337 | } | |
338 | ||
339 | /* Handle "Parameters changed", "Mode parameters changed", and | |
340 | "Capacity data has changed". */ | |
341 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
342 | scsi_rescan_device(&sdev->sdev_gendev); | |
343 | ||
344 | scsi_device_put(sdev); | |
345 | } | |
346 | ||
365a7150 CM |
347 | static void virtscsi_handle_event(struct work_struct *work) |
348 | { | |
349 | struct virtio_scsi_event_node *event_node = | |
350 | container_of(work, struct virtio_scsi_event_node, work); | |
351 | struct virtio_scsi *vscsi = event_node->vscsi; | |
352 | struct virtio_scsi_event *event = &event_node->event; | |
353 | ||
354 | if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) { | |
355 | event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED; | |
356 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); | |
357 | } | |
358 | ||
359 | switch (event->event) { | |
360 | case VIRTIO_SCSI_T_NO_EVENT: | |
361 | break; | |
362 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
363 | virtscsi_handle_transport_reset(vscsi, event); | |
364 | break; | |
865b58c0 PB |
365 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
366 | virtscsi_handle_param_change(vscsi, event); | |
367 | break; | |
365a7150 CM |
368 | default: |
369 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
370 | } | |
371 | virtscsi_kick_event(vscsi, event_node); | |
372 | } | |
373 | ||
7f82b3c9 | 374 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
375 | { |
376 | struct virtio_scsi_event_node *event_node = buf; | |
377 | ||
378 | INIT_WORK(&event_node->work, virtscsi_handle_event); | |
379 | schedule_work(&event_node->work); | |
380 | } | |
381 | ||
4fe74b1c PB |
382 | static void virtscsi_event_done(struct virtqueue *vq) |
383 | { | |
139fe45a PB |
384 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
385 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 386 | |
10f34f64 | 387 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
388 | }; |
389 | ||
4fe74b1c | 390 | /** |
682993b4 WG |
391 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue |
392 | * @vq : the struct virtqueue we're talking about | |
4fe74b1c | 393 | * @cmd : command structure |
4fe74b1c PB |
394 | * @req_size : size of the request buffer |
395 | * @resp_size : size of the response buffer | |
682993b4 | 396 | * @gfp : flags to use for memory allocations |
4fe74b1c | 397 | */ |
682993b4 WG |
398 | static int virtscsi_add_cmd(struct virtqueue *vq, |
399 | struct virtio_scsi_cmd *cmd, | |
400 | size_t req_size, size_t resp_size, gfp_t gfp) | |
4fe74b1c PB |
401 | { |
402 | struct scsi_cmnd *sc = cmd->sc; | |
682993b4 WG |
403 | struct scatterlist *sgs[4], req, resp; |
404 | struct sg_table *out, *in; | |
405 | unsigned out_num = 0, in_num = 0; | |
406 | ||
407 | out = in = NULL; | |
408 | ||
409 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
410 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
411 | out = &scsi_out(sc)->table; | |
412 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
413 | in = &scsi_in(sc)->table; | |
414 | } | |
4fe74b1c | 415 | |
4fe74b1c | 416 | /* Request header. */ |
682993b4 WG |
417 | sg_init_one(&req, &cmd->req, req_size); |
418 | sgs[out_num++] = &req; | |
4fe74b1c PB |
419 | |
420 | /* Data-out buffer. */ | |
682993b4 WG |
421 | if (out) |
422 | sgs[out_num++] = out->sgl; | |
4fe74b1c PB |
423 | |
424 | /* Response header. */ | |
682993b4 WG |
425 | sg_init_one(&resp, &cmd->resp, resp_size); |
426 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
427 | |
428 | /* Data-in buffer */ | |
682993b4 WG |
429 | if (in) |
430 | sgs[out_num + in_num++] = in->sgl; | |
4fe74b1c | 431 | |
682993b4 | 432 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, gfp); |
4fe74b1c PB |
433 | } |
434 | ||
682993b4 | 435 | static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, |
4fe74b1c PB |
436 | struct virtio_scsi_cmd *cmd, |
437 | size_t req_size, size_t resp_size, gfp_t gfp) | |
438 | { | |
4fe74b1c | 439 | unsigned long flags; |
4614e51c RR |
440 | int err; |
441 | bool needs_kick = false; | |
4fe74b1c | 442 | |
682993b4 WG |
443 | spin_lock_irqsave(&vq->vq_lock, flags); |
444 | err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size, gfp); | |
4614e51c RR |
445 | if (!err) |
446 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 447 | |
bce750b1 | 448 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 449 | |
4614e51c | 450 | if (needs_kick) |
139fe45a | 451 | virtqueue_notify(vq->vq); |
4614e51c | 452 | return err; |
4fe74b1c PB |
453 | } |
454 | ||
9141a4ca PB |
455 | static int virtscsi_queuecommand(struct virtio_scsi *vscsi, |
456 | struct virtio_scsi_vq *req_vq, | |
457 | struct scsi_cmnd *sc) | |
4fe74b1c | 458 | { |
2bd37f0f | 459 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
b54197c4 CH |
460 | struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc); |
461 | ||
2bd37f0f PB |
462 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
463 | ||
464 | /* TODO: check feature bit and fail if unsupported? */ | |
465 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
466 | ||
4fe74b1c PB |
467 | dev_dbg(&sc->device->sdev_gendev, |
468 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
469 | ||
4fe74b1c PB |
470 | memset(cmd, 0, sizeof(*cmd)); |
471 | cmd->sc = sc; | |
472 | cmd->req.cmd = (struct virtio_scsi_cmd_req){ | |
473 | .lun[0] = 1, | |
474 | .lun[1] = sc->device->id, | |
475 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
476 | .lun[3] = sc->device->lun & 0xff, | |
477 | .tag = (unsigned long)sc, | |
478 | .task_attr = VIRTIO_SCSI_S_SIMPLE, | |
479 | .prio = 0, | |
480 | .crn = 0, | |
481 | }; | |
482 | ||
483 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
484 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); | |
485 | ||
9141a4ca | 486 | if (virtscsi_kick_cmd(req_vq, cmd, |
4fe74b1c | 487 | sizeof cmd->req.cmd, sizeof cmd->resp.cmd, |
b54197c4 CH |
488 | GFP_ATOMIC) != 0) |
489 | return SCSI_MLQUEUE_HOST_BUSY; | |
490 | return 0; | |
4fe74b1c PB |
491 | } |
492 | ||
9141a4ca PB |
493 | static int virtscsi_queuecommand_single(struct Scsi_Host *sh, |
494 | struct scsi_cmnd *sc) | |
495 | { | |
496 | struct virtio_scsi *vscsi = shost_priv(sh); | |
497 | struct virtio_scsi_target_state *tgt = | |
498 | scsi_target(sc->device)->hostdata; | |
499 | ||
500 | atomic_inc(&tgt->reqs); | |
501 | return virtscsi_queuecommand(vscsi, &vscsi->req_vqs[0], sc); | |
502 | } | |
503 | ||
504 | static struct virtio_scsi_vq *virtscsi_pick_vq(struct virtio_scsi *vscsi, | |
505 | struct virtio_scsi_target_state *tgt) | |
506 | { | |
507 | struct virtio_scsi_vq *vq; | |
508 | unsigned long flags; | |
509 | u32 queue_num; | |
510 | ||
511 | spin_lock_irqsave(&tgt->tgt_lock, flags); | |
512 | ||
9141a4ca | 513 | if (atomic_inc_return(&tgt->reqs) > 1) |
f259d9bd | 514 | vq = tgt->req_vq; |
9141a4ca PB |
515 | else { |
516 | queue_num = smp_processor_id(); | |
517 | while (unlikely(queue_num >= vscsi->num_queues)) | |
518 | queue_num -= vscsi->num_queues; | |
519 | ||
520 | tgt->req_vq = vq = &vscsi->req_vqs[queue_num]; | |
521 | } | |
522 | ||
523 | spin_unlock_irqrestore(&tgt->tgt_lock, flags); | |
524 | return vq; | |
525 | } | |
526 | ||
527 | static int virtscsi_queuecommand_multi(struct Scsi_Host *sh, | |
528 | struct scsi_cmnd *sc) | |
529 | { | |
530 | struct virtio_scsi *vscsi = shost_priv(sh); | |
531 | struct virtio_scsi_target_state *tgt = | |
532 | scsi_target(sc->device)->hostdata; | |
533 | struct virtio_scsi_vq *req_vq = virtscsi_pick_vq(vscsi, tgt); | |
534 | ||
535 | return virtscsi_queuecommand(vscsi, req_vq, sc); | |
536 | } | |
537 | ||
4fe74b1c PB |
538 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) |
539 | { | |
540 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 541 | int ret = FAILED; |
4fe74b1c PB |
542 | |
543 | cmd->comp = ∁ | |
682993b4 | 544 | if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd, |
e4594bb5 PB |
545 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf, |
546 | GFP_NOIO) < 0) | |
547 | goto out; | |
4fe74b1c PB |
548 | |
549 | wait_for_completion(&comp); | |
e4594bb5 PB |
550 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
551 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
552 | ret = SUCCESS; | |
4fe74b1c | 553 | |
e4594bb5 PB |
554 | out: |
555 | mempool_free(cmd, virtscsi_cmd_pool); | |
556 | return ret; | |
4fe74b1c PB |
557 | } |
558 | ||
559 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
560 | { | |
561 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
562 | struct virtio_scsi_cmd *cmd; | |
563 | ||
564 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
565 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
566 | if (!cmd) | |
567 | return FAILED; | |
568 | ||
569 | memset(cmd, 0, sizeof(*cmd)); | |
570 | cmd->sc = sc; | |
571 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
572 | .type = VIRTIO_SCSI_T_TMF, | |
573 | .subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET, | |
574 | .lun[0] = 1, | |
575 | .lun[1] = sc->device->id, | |
576 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
577 | .lun[3] = sc->device->lun & 0xff, | |
578 | }; | |
579 | return virtscsi_tmf(vscsi, cmd); | |
580 | } | |
581 | ||
582 | static int virtscsi_abort(struct scsi_cmnd *sc) | |
583 | { | |
584 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
585 | struct virtio_scsi_cmd *cmd; | |
586 | ||
587 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
588 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
589 | if (!cmd) | |
590 | return FAILED; | |
591 | ||
592 | memset(cmd, 0, sizeof(*cmd)); | |
593 | cmd->sc = sc; | |
594 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
595 | .type = VIRTIO_SCSI_T_TMF, | |
596 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
597 | .lun[0] = 1, | |
598 | .lun[1] = sc->device->id, | |
599 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
600 | .lun[3] = sc->device->lun & 0xff, | |
601 | .tag = (unsigned long)sc, | |
602 | }; | |
603 | return virtscsi_tmf(vscsi, cmd); | |
604 | } | |
605 | ||
5c370194 WG |
606 | static int virtscsi_target_alloc(struct scsi_target *starget) |
607 | { | |
608 | struct virtio_scsi_target_state *tgt = | |
609 | kmalloc(sizeof(*tgt), GFP_KERNEL); | |
610 | if (!tgt) | |
611 | return -ENOMEM; | |
612 | ||
613 | spin_lock_init(&tgt->tgt_lock); | |
9141a4ca PB |
614 | atomic_set(&tgt->reqs, 0); |
615 | tgt->req_vq = NULL; | |
5c370194 WG |
616 | |
617 | starget->hostdata = tgt; | |
618 | return 0; | |
619 | } | |
620 | ||
621 | static void virtscsi_target_destroy(struct scsi_target *starget) | |
622 | { | |
623 | struct virtio_scsi_target_state *tgt = starget->hostdata; | |
624 | kfree(tgt); | |
625 | } | |
626 | ||
9141a4ca PB |
627 | static struct scsi_host_template virtscsi_host_template_single = { |
628 | .module = THIS_MODULE, | |
629 | .name = "Virtio SCSI HBA", | |
630 | .proc_name = "virtio_scsi", | |
631 | .this_id = -1, | |
b54197c4 | 632 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca PB |
633 | .queuecommand = virtscsi_queuecommand_single, |
634 | .eh_abort_handler = virtscsi_abort, | |
635 | .eh_device_reset_handler = virtscsi_device_reset, | |
636 | ||
637 | .can_queue = 1024, | |
638 | .dma_boundary = UINT_MAX, | |
639 | .use_clustering = ENABLE_CLUSTERING, | |
640 | .target_alloc = virtscsi_target_alloc, | |
641 | .target_destroy = virtscsi_target_destroy, | |
642 | }; | |
643 | ||
644 | static struct scsi_host_template virtscsi_host_template_multi = { | |
4fe74b1c PB |
645 | .module = THIS_MODULE, |
646 | .name = "Virtio SCSI HBA", | |
647 | .proc_name = "virtio_scsi", | |
4fe74b1c | 648 | .this_id = -1, |
b54197c4 | 649 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca | 650 | .queuecommand = virtscsi_queuecommand_multi, |
4fe74b1c PB |
651 | .eh_abort_handler = virtscsi_abort, |
652 | .eh_device_reset_handler = virtscsi_device_reset, | |
653 | ||
654 | .can_queue = 1024, | |
655 | .dma_boundary = UINT_MAX, | |
656 | .use_clustering = ENABLE_CLUSTERING, | |
5c370194 WG |
657 | .target_alloc = virtscsi_target_alloc, |
658 | .target_destroy = virtscsi_target_destroy, | |
4fe74b1c PB |
659 | }; |
660 | ||
661 | #define virtscsi_config_get(vdev, fld) \ | |
662 | ({ \ | |
663 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
855e0c52 | 664 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
665 | __val; \ |
666 | }) | |
667 | ||
668 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 669 | do { \ |
4fe74b1c | 670 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ |
855e0c52 RR |
671 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
672 | } while(0) | |
4fe74b1c | 673 | |
9141a4ca PB |
674 | static void __virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) |
675 | { | |
676 | int i; | |
677 | int cpu; | |
678 | ||
679 | /* In multiqueue mode, when the number of cpu is equal | |
680 | * to the number of request queues, we let the qeueues | |
681 | * to be private to one cpu by setting the affinity hint | |
682 | * to eliminate the contention. | |
683 | */ | |
684 | if ((vscsi->num_queues == 1 || | |
685 | vscsi->num_queues != num_online_cpus()) && affinity) { | |
686 | if (vscsi->affinity_hint_set) | |
687 | affinity = false; | |
688 | else | |
689 | return; | |
690 | } | |
691 | ||
692 | if (affinity) { | |
693 | i = 0; | |
694 | for_each_online_cpu(cpu) { | |
695 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, cpu); | |
696 | i++; | |
697 | } | |
698 | ||
699 | vscsi->affinity_hint_set = true; | |
700 | } else { | |
0c8482ac FZ |
701 | for (i = 0; i < vscsi->num_queues; i++) { |
702 | if (!vscsi->req_vqs[i].vq) | |
703 | continue; | |
704 | ||
9141a4ca | 705 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, -1); |
0c8482ac | 706 | } |
9141a4ca PB |
707 | |
708 | vscsi->affinity_hint_set = false; | |
709 | } | |
710 | } | |
711 | ||
712 | static void virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) | |
713 | { | |
714 | get_online_cpus(); | |
715 | __virtscsi_set_affinity(vscsi, affinity); | |
716 | put_online_cpus(); | |
717 | } | |
718 | ||
285e71ea WG |
719 | static int virtscsi_cpu_callback(struct notifier_block *nfb, |
720 | unsigned long action, void *hcpu) | |
721 | { | |
722 | struct virtio_scsi *vscsi = container_of(nfb, struct virtio_scsi, nb); | |
723 | switch(action) { | |
724 | case CPU_ONLINE: | |
725 | case CPU_ONLINE_FROZEN: | |
726 | case CPU_DEAD: | |
727 | case CPU_DEAD_FROZEN: | |
728 | __virtscsi_set_affinity(vscsi, true); | |
729 | break; | |
730 | default: | |
731 | break; | |
732 | } | |
733 | return NOTIFY_OK; | |
734 | } | |
735 | ||
139fe45a PB |
736 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
737 | struct virtqueue *vq) | |
738 | { | |
739 | spin_lock_init(&virtscsi_vq->vq_lock); | |
740 | virtscsi_vq->vq = vq; | |
741 | } | |
742 | ||
59057fbc NB |
743 | static void virtscsi_scan(struct virtio_device *vdev) |
744 | { | |
745 | struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv; | |
746 | ||
747 | scsi_scan_host(shost); | |
748 | } | |
749 | ||
2bd37f0f PB |
750 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
751 | { | |
9141a4ca PB |
752 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
753 | struct virtio_scsi *vscsi = shost_priv(sh); | |
754 | ||
755 | virtscsi_set_affinity(vscsi, false); | |
756 | ||
2bd37f0f PB |
757 | /* Stop all the virtqueues. */ |
758 | vdev->config->reset(vdev); | |
759 | ||
2bd37f0f PB |
760 | vdev->config->del_vqs(vdev); |
761 | } | |
762 | ||
4fe74b1c | 763 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 764 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
765 | { |
766 | int err; | |
9141a4ca PB |
767 | u32 i; |
768 | u32 num_vqs; | |
769 | vq_callback_t **callbacks; | |
770 | const char **names; | |
771 | struct virtqueue **vqs; | |
772 | ||
773 | num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE; | |
774 | vqs = kmalloc(num_vqs * sizeof(struct virtqueue *), GFP_KERNEL); | |
775 | callbacks = kmalloc(num_vqs * sizeof(vq_callback_t *), GFP_KERNEL); | |
776 | names = kmalloc(num_vqs * sizeof(char *), GFP_KERNEL); | |
777 | ||
778 | if (!callbacks || !vqs || !names) { | |
779 | err = -ENOMEM; | |
780 | goto out; | |
781 | } | |
2bd37f0f | 782 | |
9141a4ca PB |
783 | callbacks[0] = virtscsi_ctrl_done; |
784 | callbacks[1] = virtscsi_event_done; | |
785 | names[0] = "control"; | |
786 | names[1] = "event"; | |
787 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) { | |
788 | callbacks[i] = virtscsi_req_done; | |
789 | names[i] = "request"; | |
790 | } | |
4fe74b1c PB |
791 | |
792 | /* Discover virtqueues and write information to configuration. */ | |
9141a4ca | 793 | err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names); |
4fe74b1c | 794 | if (err) |
9141a4ca | 795 | goto out; |
4fe74b1c | 796 | |
139fe45a PB |
797 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
798 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
799 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
800 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
801 | vqs[i]); | |
802 | ||
803 | virtscsi_set_affinity(vscsi, true); | |
4fe74b1c PB |
804 | |
805 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); | |
806 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 807 | |
365a7150 CM |
808 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
809 | virtscsi_kick_event_all(vscsi); | |
810 | ||
9141a4ca PB |
811 | err = 0; |
812 | ||
813 | out: | |
814 | kfree(names); | |
815 | kfree(callbacks); | |
816 | kfree(vqs); | |
817 | if (err) | |
818 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 819 | return err; |
4fe74b1c PB |
820 | } |
821 | ||
6f039790 | 822 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
823 | { |
824 | struct Scsi_Host *shost; | |
825 | struct virtio_scsi *vscsi; | |
826 | int err; | |
2bd37f0f | 827 | u32 sg_elems, num_targets; |
4fe74b1c | 828 | u32 cmd_per_lun; |
9141a4ca PB |
829 | u32 num_queues; |
830 | struct scsi_host_template *hostt; | |
831 | ||
832 | /* We need to know how many queues before we allocate. */ | |
833 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
4fe74b1c | 834 | |
2bd37f0f | 835 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 836 | |
9141a4ca PB |
837 | if (num_queues == 1) |
838 | hostt = &virtscsi_host_template_single; | |
839 | else | |
840 | hostt = &virtscsi_host_template_multi; | |
841 | ||
842 | shost = scsi_host_alloc(hostt, | |
843 | sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues); | |
4fe74b1c PB |
844 | if (!shost) |
845 | return -ENOMEM; | |
846 | ||
2bd37f0f | 847 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
848 | shost->sg_tablesize = sg_elems; |
849 | vscsi = shost_priv(shost); | |
850 | vscsi->vdev = vdev; | |
9141a4ca | 851 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
852 | vdev->priv = shost; |
853 | ||
5c370194 | 854 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
855 | if (err) |
856 | goto virtscsi_init_failed; | |
857 | ||
285e71ea WG |
858 | vscsi->nb.notifier_call = &virtscsi_cpu_callback; |
859 | err = register_hotcpu_notifier(&vscsi->nb); | |
860 | if (err) { | |
861 | pr_err("registering cpu notifier failed\n"); | |
862 | goto scsi_add_host_failed; | |
863 | } | |
864 | ||
4fe74b1c PB |
865 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
866 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
867 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
868 | |
869 | /* LUNs > 256 are reported with format 1, so they go in the range | |
870 | * 16640-32767. | |
871 | */ | |
872 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 873 | shost->max_id = num_targets; |
4fe74b1c PB |
874 | shost->max_channel = 0; |
875 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
876 | err = scsi_add_host(shost, &vdev->dev); | |
877 | if (err) | |
878 | goto scsi_add_host_failed; | |
59057fbc NB |
879 | /* |
880 | * scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan() | |
881 | * after VIRTIO_CONFIG_S_DRIVER_OK has been set.. | |
882 | */ | |
4fe74b1c PB |
883 | return 0; |
884 | ||
885 | scsi_add_host_failed: | |
886 | vdev->config->del_vqs(vdev); | |
887 | virtscsi_init_failed: | |
888 | scsi_host_put(shost); | |
889 | return err; | |
890 | } | |
891 | ||
6f039790 | 892 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
893 | { |
894 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
895 | struct virtio_scsi *vscsi = shost_priv(shost); |
896 | ||
897 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
898 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
899 | |
900 | scsi_remove_host(shost); | |
901 | ||
285e71ea WG |
902 | unregister_hotcpu_notifier(&vscsi->nb); |
903 | ||
4fe74b1c PB |
904 | virtscsi_remove_vqs(vdev); |
905 | scsi_host_put(shost); | |
906 | } | |
907 | ||
89107000 | 908 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
909 | static int virtscsi_freeze(struct virtio_device *vdev) |
910 | { | |
f466f753 AH |
911 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
912 | struct virtio_scsi *vscsi = shost_priv(sh); | |
913 | ||
914 | unregister_hotcpu_notifier(&vscsi->nb); | |
4fe74b1c PB |
915 | virtscsi_remove_vqs(vdev); |
916 | return 0; | |
917 | } | |
918 | ||
919 | static int virtscsi_restore(struct virtio_device *vdev) | |
920 | { | |
921 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
922 | struct virtio_scsi *vscsi = shost_priv(sh); | |
f466f753 AH |
923 | int err; |
924 | ||
925 | err = virtscsi_init(vdev, vscsi); | |
926 | if (err) | |
927 | return err; | |
928 | ||
929 | err = register_hotcpu_notifier(&vscsi->nb); | |
930 | if (err) | |
931 | vdev->config->del_vqs(vdev); | |
4fe74b1c | 932 | |
f466f753 | 933 | return err; |
4fe74b1c PB |
934 | } |
935 | #endif | |
936 | ||
937 | static struct virtio_device_id id_table[] = { | |
938 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
939 | { 0 }, | |
940 | }; | |
941 | ||
365a7150 | 942 | static unsigned int features[] = { |
865b58c0 PB |
943 | VIRTIO_SCSI_F_HOTPLUG, |
944 | VIRTIO_SCSI_F_CHANGE, | |
365a7150 CM |
945 | }; |
946 | ||
4fe74b1c | 947 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
948 | .feature_table = features, |
949 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
950 | .driver.name = KBUILD_MODNAME, |
951 | .driver.owner = THIS_MODULE, | |
952 | .id_table = id_table, | |
953 | .probe = virtscsi_probe, | |
59057fbc | 954 | .scan = virtscsi_scan, |
89107000 | 955 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
956 | .freeze = virtscsi_freeze, |
957 | .restore = virtscsi_restore, | |
958 | #endif | |
6f039790 | 959 | .remove = virtscsi_remove, |
4fe74b1c PB |
960 | }; |
961 | ||
962 | static int __init init(void) | |
963 | { | |
964 | int ret = -ENOMEM; | |
965 | ||
966 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
967 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 968 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
969 | goto error; |
970 | } | |
971 | ||
972 | ||
973 | virtscsi_cmd_pool = | |
974 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
975 | virtscsi_cmd_cache); | |
976 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 977 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
978 | goto error; |
979 | } | |
980 | ret = register_virtio_driver(&virtio_scsi_driver); | |
981 | if (ret < 0) | |
982 | goto error; | |
983 | ||
984 | return 0; | |
985 | ||
986 | error: | |
987 | if (virtscsi_cmd_pool) { | |
988 | mempool_destroy(virtscsi_cmd_pool); | |
989 | virtscsi_cmd_pool = NULL; | |
990 | } | |
991 | if (virtscsi_cmd_cache) { | |
992 | kmem_cache_destroy(virtscsi_cmd_cache); | |
993 | virtscsi_cmd_cache = NULL; | |
994 | } | |
995 | return ret; | |
996 | } | |
997 | ||
998 | static void __exit fini(void) | |
999 | { | |
1000 | unregister_virtio_driver(&virtio_scsi_driver); | |
1001 | mempool_destroy(virtscsi_cmd_pool); | |
1002 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1003 | } | |
1004 | module_init(init); | |
1005 | module_exit(fini); | |
1006 | ||
1007 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1008 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
1009 | MODULE_LICENSE("GPL"); |