]>
Commit | Line | Data |
---|---|---|
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> | |
0d9f0a52 | 21 | #include <linux/interrupt.h> |
4fe74b1c PB |
22 | #include <linux/virtio.h> |
23 | #include <linux/virtio_ids.h> | |
24 | #include <linux/virtio_config.h> | |
25 | #include <linux/virtio_scsi.h> | |
9141a4ca | 26 | #include <linux/cpu.h> |
e6dc783a | 27 | #include <linux/blkdev.h> |
4fe74b1c PB |
28 | #include <scsi/scsi_host.h> |
29 | #include <scsi/scsi_device.h> | |
30 | #include <scsi/scsi_cmnd.h> | |
761f1193 | 31 | #include <scsi/scsi_tcq.h> |
25d1d50e | 32 | #include <scsi/scsi_devinfo.h> |
938ece71 | 33 | #include <linux/seqlock.h> |
0d9f0a52 | 34 | #include <linux/blk-mq-virtio.h> |
4fe74b1c PB |
35 | |
36 | #define VIRTIO_SCSI_MEMPOOL_SZ 64 | |
365a7150 | 37 | #define VIRTIO_SCSI_EVENT_LEN 8 |
9141a4ca | 38 | #define VIRTIO_SCSI_VQ_BASE 2 |
4fe74b1c PB |
39 | |
40 | /* Command queue element */ | |
41 | struct virtio_scsi_cmd { | |
42 | struct scsi_cmnd *sc; | |
43 | struct completion *comp; | |
44 | union { | |
45 | struct virtio_scsi_cmd_req cmd; | |
e6dc783a | 46 | struct virtio_scsi_cmd_req_pi cmd_pi; |
4fe74b1c PB |
47 | struct virtio_scsi_ctrl_tmf_req tmf; |
48 | struct virtio_scsi_ctrl_an_req an; | |
49 | } req; | |
50 | union { | |
51 | struct virtio_scsi_cmd_resp cmd; | |
52 | struct virtio_scsi_ctrl_tmf_resp tmf; | |
53 | struct virtio_scsi_ctrl_an_resp an; | |
54 | struct virtio_scsi_event evt; | |
55 | } resp; | |
56 | } ____cacheline_aligned_in_smp; | |
57 | ||
365a7150 CM |
58 | struct virtio_scsi_event_node { |
59 | struct virtio_scsi *vscsi; | |
60 | struct virtio_scsi_event event; | |
61 | struct work_struct work; | |
62 | }; | |
63 | ||
139fe45a PB |
64 | struct virtio_scsi_vq { |
65 | /* Protects vq */ | |
66 | spinlock_t vq_lock; | |
67 | ||
68 | struct virtqueue *vq; | |
69 | }; | |
70 | ||
4fe74b1c PB |
71 | /* Driver instance state */ |
72 | struct virtio_scsi { | |
4fe74b1c | 73 | struct virtio_device *vdev; |
2bd37f0f | 74 | |
365a7150 CM |
75 | /* Get some buffers ready for event vq */ |
76 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
9141a4ca PB |
77 | |
78 | u32 num_queues; | |
79 | ||
80 | /* If the affinity hint is set for virtqueues */ | |
81 | bool affinity_hint_set; | |
82 | ||
8904f5a5 | 83 | struct hlist_node node; |
285e71ea | 84 | |
e67423c7 MT |
85 | /* Protected by event_vq lock */ |
86 | bool stop_events; | |
87 | ||
9141a4ca PB |
88 | struct virtio_scsi_vq ctrl_vq; |
89 | struct virtio_scsi_vq event_vq; | |
90 | struct virtio_scsi_vq req_vqs[]; | |
4fe74b1c PB |
91 | }; |
92 | ||
93 | static struct kmem_cache *virtscsi_cmd_cache; | |
94 | static mempool_t *virtscsi_cmd_pool; | |
95 | ||
96 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
97 | { | |
98 | return vdev->priv; | |
99 | } | |
100 | ||
101 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
102 | { | |
ae3d56d8 | 103 | if (resid) |
4fe74b1c | 104 | scsi_set_resid(sc, resid); |
4fe74b1c PB |
105 | } |
106 | ||
107 | /** | |
108 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
109 | * | |
110 | * Called with vq_lock held. | |
111 | */ | |
7f82b3c9 | 112 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
113 | { |
114 | struct virtio_scsi_cmd *cmd = buf; | |
115 | struct scsi_cmnd *sc = cmd->sc; | |
116 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
117 | ||
118 | dev_dbg(&sc->device->sdev_gendev, | |
119 | "cmd %p response %u status %#02x sense_len %u\n", | |
120 | sc, resp->response, resp->status, resp->sense_len); | |
121 | ||
122 | sc->result = resp->status; | |
d75dff39 | 123 | virtscsi_compute_resid(sc, virtio32_to_cpu(vscsi->vdev, resp->resid)); |
4fe74b1c PB |
124 | switch (resp->response) { |
125 | case VIRTIO_SCSI_S_OK: | |
126 | set_host_byte(sc, DID_OK); | |
127 | break; | |
128 | case VIRTIO_SCSI_S_OVERRUN: | |
129 | set_host_byte(sc, DID_ERROR); | |
130 | break; | |
131 | case VIRTIO_SCSI_S_ABORTED: | |
132 | set_host_byte(sc, DID_ABORT); | |
133 | break; | |
134 | case VIRTIO_SCSI_S_BAD_TARGET: | |
135 | set_host_byte(sc, DID_BAD_TARGET); | |
136 | break; | |
137 | case VIRTIO_SCSI_S_RESET: | |
138 | set_host_byte(sc, DID_RESET); | |
139 | break; | |
140 | case VIRTIO_SCSI_S_BUSY: | |
141 | set_host_byte(sc, DID_BUS_BUSY); | |
142 | break; | |
143 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
144 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
145 | break; | |
146 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
147 | set_host_byte(sc, DID_TARGET_FAILURE); | |
148 | break; | |
149 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
150 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
151 | break; | |
152 | default: | |
153 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
154 | resp->response); | |
155 | /* fall through */ | |
156 | case VIRTIO_SCSI_S_FAILURE: | |
157 | set_host_byte(sc, DID_ERROR); | |
158 | break; | |
159 | } | |
160 | ||
d75dff39 MT |
161 | WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) > |
162 | VIRTIO_SCSI_SENSE_SIZE); | |
4fe74b1c PB |
163 | if (sc->sense_buffer) { |
164 | memcpy(sc->sense_buffer, resp->sense, | |
d75dff39 MT |
165 | min_t(u32, |
166 | virtio32_to_cpu(vscsi->vdev, resp->sense_len), | |
167 | VIRTIO_SCSI_SENSE_SIZE)); | |
4fe74b1c PB |
168 | if (resp->sense_len) |
169 | set_driver_byte(sc, DRIVER_SENSE); | |
170 | } | |
171 | ||
4fe74b1c PB |
172 | sc->scsi_done(sc); |
173 | } | |
174 | ||
10f34f64 PB |
175 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
176 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 177 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 178 | { |
4fe74b1c | 179 | void *buf; |
4fe74b1c | 180 | unsigned int len; |
10f34f64 PB |
181 | unsigned long flags; |
182 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 183 | |
10f34f64 | 184 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
185 | do { |
186 | virtqueue_disable_cb(vq); | |
187 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 188 | fn(vscsi, buf); |
2bf4fd31 HG |
189 | |
190 | if (unlikely(virtqueue_is_broken(vq))) | |
191 | break; | |
4fe74b1c | 192 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 193 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
194 | } |
195 | ||
196 | static void virtscsi_req_done(struct virtqueue *vq) | |
197 | { | |
139fe45a PB |
198 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
199 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
200 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
201 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
202 | ||
9141a4ca | 203 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); |
4fe74b1c PB |
204 | }; |
205 | ||
8faeb529 PB |
206 | static void virtscsi_poll_requests(struct virtio_scsi *vscsi) |
207 | { | |
208 | int i, num_vqs; | |
209 | ||
210 | num_vqs = vscsi->num_queues; | |
211 | for (i = 0; i < num_vqs; i++) | |
212 | virtscsi_vq_done(vscsi, &vscsi->req_vqs[i], | |
213 | virtscsi_complete_cmd); | |
214 | } | |
215 | ||
7f82b3c9 | 216 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
217 | { |
218 | struct virtio_scsi_cmd *cmd = buf; | |
219 | ||
220 | if (cmd->comp) | |
e8f81420 | 221 | complete(cmd->comp); |
4fe74b1c PB |
222 | } |
223 | ||
224 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
225 | { | |
139fe45a PB |
226 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
227 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 228 | |
10f34f64 | 229 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
230 | }; |
231 | ||
cdda0e5a PB |
232 | static void virtscsi_handle_event(struct work_struct *work); |
233 | ||
365a7150 CM |
234 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
235 | struct virtio_scsi_event_node *event_node) | |
236 | { | |
4614e51c | 237 | int err; |
365a7150 CM |
238 | struct scatterlist sg; |
239 | unsigned long flags; | |
240 | ||
cdda0e5a | 241 | INIT_WORK(&event_node->work, virtscsi_handle_event); |
2e9c9dfd | 242 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
243 | |
244 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
245 | ||
bf958291 RR |
246 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
247 | GFP_ATOMIC); | |
4614e51c | 248 | if (!err) |
365a7150 CM |
249 | virtqueue_kick(vscsi->event_vq.vq); |
250 | ||
251 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
252 | ||
4614e51c | 253 | return err; |
365a7150 CM |
254 | } |
255 | ||
256 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
257 | { | |
258 | int i; | |
259 | ||
260 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
261 | vscsi->event_list[i].vscsi = vscsi; | |
262 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
263 | } | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
269 | { | |
270 | int i; | |
271 | ||
e67423c7 MT |
272 | /* Stop scheduling work before calling cancel_work_sync. */ |
273 | spin_lock_irq(&vscsi->event_vq.vq_lock); | |
274 | vscsi->stop_events = true; | |
275 | spin_unlock_irq(&vscsi->event_vq.vq_lock); | |
276 | ||
365a7150 CM |
277 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) |
278 | cancel_work_sync(&vscsi->event_list[i].work); | |
279 | } | |
280 | ||
281 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 282 | struct virtio_scsi_event *event) |
365a7150 CM |
283 | { |
284 | struct scsi_device *sdev; | |
285 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
286 | unsigned int target = event->lun[1]; | |
287 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
288 | ||
d75dff39 | 289 | switch (virtio32_to_cpu(vscsi->vdev, event->reason)) { |
365a7150 CM |
290 | case VIRTIO_SCSI_EVT_RESET_RESCAN: |
291 | scsi_add_device(shost, 0, target, lun); | |
292 | break; | |
293 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
294 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
295 | if (sdev) { | |
296 | scsi_remove_device(sdev); | |
297 | scsi_device_put(sdev); | |
298 | } else { | |
299 | pr_err("SCSI device %d 0 %d %d not found\n", | |
300 | shost->host_no, target, lun); | |
301 | } | |
302 | break; | |
303 | default: | |
304 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
305 | } | |
306 | } | |
307 | ||
865b58c0 PB |
308 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
309 | struct virtio_scsi_event *event) | |
310 | { | |
311 | struct scsi_device *sdev; | |
312 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
313 | unsigned int target = event->lun[1]; | |
314 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
d75dff39 MT |
315 | u8 asc = virtio32_to_cpu(vscsi->vdev, event->reason) & 255; |
316 | u8 ascq = virtio32_to_cpu(vscsi->vdev, event->reason) >> 8; | |
865b58c0 PB |
317 | |
318 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
319 | if (!sdev) { | |
320 | pr_err("SCSI device %d 0 %d %d not found\n", | |
321 | shost->host_no, target, lun); | |
322 | return; | |
323 | } | |
324 | ||
325 | /* Handle "Parameters changed", "Mode parameters changed", and | |
326 | "Capacity data has changed". */ | |
327 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
328 | scsi_rescan_device(&sdev->sdev_gendev); | |
329 | ||
330 | scsi_device_put(sdev); | |
331 | } | |
332 | ||
365a7150 CM |
333 | static void virtscsi_handle_event(struct work_struct *work) |
334 | { | |
335 | struct virtio_scsi_event_node *event_node = | |
336 | container_of(work, struct virtio_scsi_event_node, work); | |
337 | struct virtio_scsi *vscsi = event_node->vscsi; | |
338 | struct virtio_scsi_event *event = &event_node->event; | |
339 | ||
d75dff39 MT |
340 | if (event->event & |
341 | cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) { | |
342 | event->event &= ~cpu_to_virtio32(vscsi->vdev, | |
343 | VIRTIO_SCSI_T_EVENTS_MISSED); | |
365a7150 CM |
344 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); |
345 | } | |
346 | ||
d75dff39 | 347 | switch (virtio32_to_cpu(vscsi->vdev, event->event)) { |
365a7150 CM |
348 | case VIRTIO_SCSI_T_NO_EVENT: |
349 | break; | |
350 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
351 | virtscsi_handle_transport_reset(vscsi, event); | |
352 | break; | |
865b58c0 PB |
353 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
354 | virtscsi_handle_param_change(vscsi, event); | |
355 | break; | |
365a7150 CM |
356 | default: |
357 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
358 | } | |
359 | virtscsi_kick_event(vscsi, event_node); | |
360 | } | |
361 | ||
7f82b3c9 | 362 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
363 | { |
364 | struct virtio_scsi_event_node *event_node = buf; | |
365 | ||
e67423c7 MT |
366 | if (!vscsi->stop_events) |
367 | queue_work(system_freezable_wq, &event_node->work); | |
365a7150 CM |
368 | } |
369 | ||
4fe74b1c PB |
370 | static void virtscsi_event_done(struct virtqueue *vq) |
371 | { | |
139fe45a PB |
372 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
373 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 374 | |
10f34f64 | 375 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
376 | }; |
377 | ||
4fe74b1c | 378 | /** |
682993b4 WG |
379 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue |
380 | * @vq : the struct virtqueue we're talking about | |
4fe74b1c | 381 | * @cmd : command structure |
4fe74b1c PB |
382 | * @req_size : size of the request buffer |
383 | * @resp_size : size of the response buffer | |
4fe74b1c | 384 | */ |
682993b4 WG |
385 | static int virtscsi_add_cmd(struct virtqueue *vq, |
386 | struct virtio_scsi_cmd *cmd, | |
c77fba9a | 387 | size_t req_size, size_t resp_size) |
4fe74b1c PB |
388 | { |
389 | struct scsi_cmnd *sc = cmd->sc; | |
e6dc783a | 390 | struct scatterlist *sgs[6], req, resp; |
682993b4 WG |
391 | struct sg_table *out, *in; |
392 | unsigned out_num = 0, in_num = 0; | |
393 | ||
394 | out = in = NULL; | |
395 | ||
396 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
397 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
ae3d56d8 | 398 | out = &sc->sdb.table; |
682993b4 | 399 | if (sc->sc_data_direction != DMA_TO_DEVICE) |
ae3d56d8 | 400 | in = &sc->sdb.table; |
682993b4 | 401 | } |
4fe74b1c | 402 | |
4fe74b1c | 403 | /* Request header. */ |
682993b4 WG |
404 | sg_init_one(&req, &cmd->req, req_size); |
405 | sgs[out_num++] = &req; | |
4fe74b1c PB |
406 | |
407 | /* Data-out buffer. */ | |
e6dc783a NB |
408 | if (out) { |
409 | /* Place WRITE protection SGLs before Data OUT payload */ | |
410 | if (scsi_prot_sg_count(sc)) | |
411 | sgs[out_num++] = scsi_prot_sglist(sc); | |
682993b4 | 412 | sgs[out_num++] = out->sgl; |
e6dc783a | 413 | } |
4fe74b1c PB |
414 | |
415 | /* Response header. */ | |
682993b4 WG |
416 | sg_init_one(&resp, &cmd->resp, resp_size); |
417 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
418 | |
419 | /* Data-in buffer */ | |
e6dc783a NB |
420 | if (in) { |
421 | /* Place READ protection SGLs before Data IN payload */ | |
422 | if (scsi_prot_sg_count(sc)) | |
423 | sgs[out_num + in_num++] = scsi_prot_sglist(sc); | |
682993b4 | 424 | sgs[out_num + in_num++] = in->sgl; |
e6dc783a | 425 | } |
4fe74b1c | 426 | |
c77fba9a | 427 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC); |
4fe74b1c PB |
428 | } |
429 | ||
682993b4 | 430 | static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, |
4fe74b1c | 431 | struct virtio_scsi_cmd *cmd, |
c77fba9a | 432 | size_t req_size, size_t resp_size) |
4fe74b1c | 433 | { |
4fe74b1c | 434 | unsigned long flags; |
4614e51c RR |
435 | int err; |
436 | bool needs_kick = false; | |
4fe74b1c | 437 | |
682993b4 | 438 | spin_lock_irqsave(&vq->vq_lock, flags); |
c77fba9a | 439 | err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size); |
4614e51c RR |
440 | if (!err) |
441 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 442 | |
bce750b1 | 443 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 444 | |
4614e51c | 445 | if (needs_kick) |
139fe45a | 446 | virtqueue_notify(vq->vq); |
4614e51c | 447 | return err; |
4fe74b1c PB |
448 | } |
449 | ||
d75dff39 MT |
450 | static void virtio_scsi_init_hdr(struct virtio_device *vdev, |
451 | struct virtio_scsi_cmd_req *cmd, | |
e6dc783a NB |
452 | struct scsi_cmnd *sc) |
453 | { | |
454 | cmd->lun[0] = 1; | |
455 | cmd->lun[1] = sc->device->id; | |
456 | cmd->lun[2] = (sc->device->lun >> 8) | 0x40; | |
457 | cmd->lun[3] = sc->device->lun & 0xff; | |
d75dff39 | 458 | cmd->tag = cpu_to_virtio64(vdev, (unsigned long)sc); |
e6dc783a NB |
459 | cmd->task_attr = VIRTIO_SCSI_S_SIMPLE; |
460 | cmd->prio = 0; | |
461 | cmd->crn = 0; | |
462 | } | |
463 | ||
c5c2567f | 464 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
d75dff39 MT |
465 | static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev, |
466 | struct virtio_scsi_cmd_req_pi *cmd_pi, | |
e6dc783a NB |
467 | struct scsi_cmnd *sc) |
468 | { | |
469 | struct request *rq = sc->request; | |
470 | struct blk_integrity *bi; | |
471 | ||
d75dff39 | 472 | virtio_scsi_init_hdr(vdev, (struct virtio_scsi_cmd_req *)cmd_pi, sc); |
e6dc783a NB |
473 | |
474 | if (!rq || !scsi_prot_sg_count(sc)) | |
475 | return; | |
476 | ||
477 | bi = blk_get_integrity(rq->rq_disk); | |
478 | ||
479 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
d75dff39 | 480 | cmd_pi->pi_bytesout = cpu_to_virtio32(vdev, |
cdcdcaae GE |
481 | bio_integrity_bytes(bi, |
482 | blk_rq_sectors(rq))); | |
e6dc783a | 483 | else if (sc->sc_data_direction == DMA_FROM_DEVICE) |
d75dff39 | 484 | cmd_pi->pi_bytesin = cpu_to_virtio32(vdev, |
cdcdcaae GE |
485 | bio_integrity_bytes(bi, |
486 | blk_rq_sectors(rq))); | |
e6dc783a | 487 | } |
c5c2567f | 488 | #endif |
e6dc783a | 489 | |
c3506df8 ML |
490 | static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi, |
491 | struct scsi_cmnd *sc) | |
492 | { | |
493 | u32 tag = blk_mq_unique_tag(sc->request); | |
494 | u16 hwq = blk_mq_unique_tag_to_hwq(tag); | |
495 | ||
496 | return &vscsi->req_vqs[hwq]; | |
497 | } | |
498 | ||
499 | static int virtscsi_queuecommand(struct Scsi_Host *shost, | |
9141a4ca | 500 | struct scsi_cmnd *sc) |
4fe74b1c | 501 | { |
c3506df8 ML |
502 | struct virtio_scsi *vscsi = shost_priv(shost); |
503 | struct virtio_scsi_vq *req_vq = virtscsi_pick_vq_mq(vscsi, sc); | |
b54197c4 | 504 | struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc); |
773c7220 | 505 | unsigned long flags; |
ed9ea4ed | 506 | int req_size; |
773c7220 | 507 | int ret; |
b54197c4 | 508 | |
2bd37f0f PB |
509 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
510 | ||
511 | /* TODO: check feature bit and fail if unsupported? */ | |
512 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
513 | ||
4fe74b1c PB |
514 | dev_dbg(&sc->device->sdev_gendev, |
515 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
516 | ||
4fe74b1c | 517 | cmd->sc = sc; |
4fe74b1c PB |
518 | |
519 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
4fe74b1c | 520 | |
c5c2567f | 521 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 522 | if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) { |
d75dff39 | 523 | virtio_scsi_init_hdr_pi(vscsi->vdev, &cmd->req.cmd_pi, sc); |
e6dc783a NB |
524 | memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len); |
525 | req_size = sizeof(cmd->req.cmd_pi); | |
c5c2567f CH |
526 | } else |
527 | #endif | |
528 | { | |
d75dff39 | 529 | virtio_scsi_init_hdr(vscsi->vdev, &cmd->req.cmd, sc); |
e6dc783a NB |
530 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); |
531 | req_size = sizeof(cmd->req.cmd); | |
532 | } | |
533 | ||
773c7220 EF |
534 | ret = virtscsi_kick_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd)); |
535 | if (ret == -EIO) { | |
536 | cmd->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; | |
537 | spin_lock_irqsave(&req_vq->vq_lock, flags); | |
538 | virtscsi_complete_cmd(vscsi, cmd); | |
539 | spin_unlock_irqrestore(&req_vq->vq_lock, flags); | |
540 | } else if (ret != 0) { | |
b54197c4 | 541 | return SCSI_MLQUEUE_HOST_BUSY; |
773c7220 | 542 | } |
b54197c4 | 543 | return 0; |
4fe74b1c PB |
544 | } |
545 | ||
546 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) | |
547 | { | |
548 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 549 | int ret = FAILED; |
4fe74b1c PB |
550 | |
551 | cmd->comp = ∁ | |
682993b4 | 552 | if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd, |
c77fba9a | 553 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf) < 0) |
e4594bb5 | 554 | goto out; |
4fe74b1c PB |
555 | |
556 | wait_for_completion(&comp); | |
e4594bb5 PB |
557 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
558 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
559 | ret = SUCCESS; | |
4fe74b1c | 560 | |
8faeb529 PB |
561 | /* |
562 | * The spec guarantees that all requests related to the TMF have | |
563 | * been completed, but the callback might not have run yet if | |
564 | * we're using independent interrupts (e.g. MSI). Poll the | |
565 | * virtqueues once. | |
566 | * | |
567 | * In the abort case, sc->scsi_done will do nothing, because | |
568 | * the block layer must have detected a timeout and as a result | |
569 | * REQ_ATOM_COMPLETE has been set. | |
570 | */ | |
571 | virtscsi_poll_requests(vscsi); | |
572 | ||
e4594bb5 PB |
573 | out: |
574 | mempool_free(cmd, virtscsi_cmd_pool); | |
575 | return ret; | |
4fe74b1c PB |
576 | } |
577 | ||
578 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
579 | { | |
580 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
581 | struct virtio_scsi_cmd *cmd; | |
582 | ||
583 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
584 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
585 | if (!cmd) | |
586 | return FAILED; | |
587 | ||
588 | memset(cmd, 0, sizeof(*cmd)); | |
4fe74b1c PB |
589 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
590 | .type = VIRTIO_SCSI_T_TMF, | |
d75dff39 MT |
591 | .subtype = cpu_to_virtio32(vscsi->vdev, |
592 | VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET), | |
4fe74b1c PB |
593 | .lun[0] = 1, |
594 | .lun[1] = sc->device->id, | |
595 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
596 | .lun[3] = sc->device->lun & 0xff, | |
597 | }; | |
598 | return virtscsi_tmf(vscsi, cmd); | |
599 | } | |
600 | ||
25d1d50e DG |
601 | static int virtscsi_device_alloc(struct scsi_device *sdevice) |
602 | { | |
603 | /* | |
604 | * Passed through SCSI targets (e.g. with qemu's 'scsi-block') | |
605 | * may have transfer limits which come from the host SCSI | |
606 | * controller or something on the host side other than the | |
607 | * target itself. | |
608 | * | |
609 | * To make this work properly, the hypervisor can adjust the | |
610 | * target's VPD information to advertise these limits. But | |
611 | * for that to work, the guest has to look at the VPD pages, | |
612 | * which we won't do by default if it is an SPC-2 device, even | |
613 | * if it does actually support it. | |
614 | * | |
615 | * So, set the blist to always try to read the VPD pages. | |
616 | */ | |
617 | sdevice->sdev_bflags = BLIST_TRY_VPD_PAGES; | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | ||
761f1193 VS |
623 | /** |
624 | * virtscsi_change_queue_depth() - Change a virtscsi target's queue depth | |
625 | * @sdev: Virtscsi target whose queue depth to change | |
626 | * @qdepth: New queue depth | |
761f1193 | 627 | */ |
db5ed4df | 628 | static int virtscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
761f1193 VS |
629 | { |
630 | struct Scsi_Host *shost = sdev->host; | |
631 | int max_depth = shost->cmd_per_lun; | |
632 | ||
db5ed4df | 633 | return scsi_change_queue_depth(sdev, min(max_depth, qdepth)); |
761f1193 VS |
634 | } |
635 | ||
4fe74b1c PB |
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)); | |
4fe74b1c PB |
647 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
648 | .type = VIRTIO_SCSI_T_TMF, | |
649 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
650 | .lun[0] = 1, | |
651 | .lun[1] = sc->device->id, | |
652 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
653 | .lun[3] = sc->device->lun & 0xff, | |
d75dff39 | 654 | .tag = cpu_to_virtio64(vscsi->vdev, (unsigned long)sc), |
4fe74b1c PB |
655 | }; |
656 | return virtscsi_tmf(vscsi, cmd); | |
657 | } | |
658 | ||
0d9f0a52 CH |
659 | static int virtscsi_map_queues(struct Scsi_Host *shost) |
660 | { | |
661 | struct virtio_scsi *vscsi = shost_priv(shost); | |
ed76e329 | 662 | struct blk_mq_queue_map *qmap = &shost->tag_set.map[0]; |
0d9f0a52 | 663 | |
ed76e329 | 664 | return blk_mq_virtio_map_queues(qmap, vscsi->vdev, 2); |
0d9f0a52 CH |
665 | } |
666 | ||
e72c9a2a PB |
667 | /* |
668 | * The host guarantees to respond to each command, although I/O | |
669 | * latencies might be higher than on bare metal. Reset the timer | |
670 | * unconditionally to give the host a chance to perform EH. | |
671 | */ | |
672 | static enum blk_eh_timer_return virtscsi_eh_timed_out(struct scsi_cmnd *scmnd) | |
673 | { | |
674 | return BLK_EH_RESET_TIMER; | |
675 | } | |
676 | ||
c3506df8 | 677 | static struct scsi_host_template virtscsi_host_template = { |
4fe74b1c PB |
678 | .module = THIS_MODULE, |
679 | .name = "Virtio SCSI HBA", | |
680 | .proc_name = "virtio_scsi", | |
4fe74b1c | 681 | .this_id = -1, |
b54197c4 | 682 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
c3506df8 | 683 | .queuecommand = virtscsi_queuecommand, |
761f1193 | 684 | .change_queue_depth = virtscsi_change_queue_depth, |
4fe74b1c PB |
685 | .eh_abort_handler = virtscsi_abort, |
686 | .eh_device_reset_handler = virtscsi_device_reset, | |
e72c9a2a | 687 | .eh_timed_out = virtscsi_eh_timed_out, |
a680f1d4 | 688 | .slave_alloc = virtscsi_device_alloc, |
4fe74b1c | 689 | |
4fe74b1c | 690 | .dma_boundary = UINT_MAX, |
0d9f0a52 | 691 | .map_queues = virtscsi_map_queues, |
c40ecc12 | 692 | .track_queue_depth = 1, |
b5b6e8c8 | 693 | .force_blk_mq = 1, |
4fe74b1c PB |
694 | }; |
695 | ||
696 | #define virtscsi_config_get(vdev, fld) \ | |
697 | ({ \ | |
698 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
855e0c52 | 699 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
700 | __val; \ |
701 | }) | |
702 | ||
703 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 704 | do { \ |
4fe74b1c | 705 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ |
855e0c52 RR |
706 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
707 | } while(0) | |
4fe74b1c | 708 | |
139fe45a PB |
709 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
710 | struct virtqueue *vq) | |
711 | { | |
712 | spin_lock_init(&virtscsi_vq->vq_lock); | |
713 | virtscsi_vq->vq = vq; | |
714 | } | |
715 | ||
2bd37f0f PB |
716 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
717 | { | |
2bd37f0f PB |
718 | /* Stop all the virtqueues. */ |
719 | vdev->config->reset(vdev); | |
2bd37f0f PB |
720 | vdev->config->del_vqs(vdev); |
721 | } | |
722 | ||
4fe74b1c | 723 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 724 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
725 | { |
726 | int err; | |
9141a4ca PB |
727 | u32 i; |
728 | u32 num_vqs; | |
729 | vq_callback_t **callbacks; | |
730 | const char **names; | |
731 | struct virtqueue **vqs; | |
0d9f0a52 | 732 | struct irq_affinity desc = { .pre_vectors = 2 }; |
9141a4ca PB |
733 | |
734 | num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE; | |
6da2ec56 KC |
735 | vqs = kmalloc_array(num_vqs, sizeof(struct virtqueue *), GFP_KERNEL); |
736 | callbacks = kmalloc_array(num_vqs, sizeof(vq_callback_t *), | |
737 | GFP_KERNEL); | |
738 | names = kmalloc_array(num_vqs, sizeof(char *), GFP_KERNEL); | |
9141a4ca PB |
739 | |
740 | if (!callbacks || !vqs || !names) { | |
741 | err = -ENOMEM; | |
742 | goto out; | |
743 | } | |
2bd37f0f | 744 | |
9141a4ca PB |
745 | callbacks[0] = virtscsi_ctrl_done; |
746 | callbacks[1] = virtscsi_event_done; | |
747 | names[0] = "control"; | |
748 | names[1] = "event"; | |
749 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) { | |
750 | callbacks[i] = virtscsi_req_done; | |
751 | names[i] = "request"; | |
752 | } | |
4fe74b1c PB |
753 | |
754 | /* Discover virtqueues and write information to configuration. */ | |
9b2bbdb2 | 755 | err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc); |
4fe74b1c | 756 | if (err) |
9141a4ca | 757 | goto out; |
4fe74b1c | 758 | |
139fe45a PB |
759 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
760 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
761 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
762 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
763 | vqs[i]); | |
764 | ||
4fe74b1c PB |
765 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); |
766 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 767 | |
9141a4ca PB |
768 | err = 0; |
769 | ||
770 | out: | |
771 | kfree(names); | |
772 | kfree(callbacks); | |
773 | kfree(vqs); | |
774 | if (err) | |
775 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 776 | return err; |
4fe74b1c PB |
777 | } |
778 | ||
6f039790 | 779 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
780 | { |
781 | struct Scsi_Host *shost; | |
782 | struct virtio_scsi *vscsi; | |
908a5544 | 783 | int err; |
2bd37f0f | 784 | u32 sg_elems, num_targets; |
4fe74b1c | 785 | u32 cmd_per_lun; |
9141a4ca | 786 | u32 num_queues; |
9141a4ca | 787 | |
8cab3cd6 MT |
788 | if (!vdev->config->get) { |
789 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
790 | __func__); | |
791 | return -EINVAL; | |
792 | } | |
793 | ||
9141a4ca PB |
794 | /* We need to know how many queues before we allocate. */ |
795 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
4fe74b1c | 796 | |
2bd37f0f | 797 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 798 | |
c3506df8 | 799 | shost = scsi_host_alloc(&virtscsi_host_template, |
9141a4ca | 800 | sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues); |
4fe74b1c PB |
801 | if (!shost) |
802 | return -ENOMEM; | |
803 | ||
2bd37f0f | 804 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
805 | shost->sg_tablesize = sg_elems; |
806 | vscsi = shost_priv(shost); | |
807 | vscsi->vdev = vdev; | |
9141a4ca | 808 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
809 | vdev->priv = shost; |
810 | ||
5c370194 | 811 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
812 | if (err) |
813 | goto virtscsi_init_failed; | |
814 | ||
582b0ab2 RJ |
815 | shost->can_queue = virtqueue_get_vring_size(vscsi->req_vqs[0].vq); |
816 | ||
4fe74b1c PB |
817 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
818 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
819 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
820 | |
821 | /* LUNs > 256 are reported with format 1, so they go in the range | |
822 | * 16640-32767. | |
823 | */ | |
824 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 825 | shost->max_id = num_targets; |
4fe74b1c PB |
826 | shost->max_channel = 0; |
827 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
ccbedf11 | 828 | shost->nr_hw_queues = num_queues; |
e6dc783a | 829 | |
c5c2567f | 830 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 831 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) { |
908a5544 SR |
832 | int host_prot; |
833 | ||
e6dc783a NB |
834 | host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | |
835 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | | |
836 | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; | |
837 | ||
838 | scsi_host_set_prot(shost, host_prot); | |
839 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
840 | } | |
c5c2567f | 841 | #endif |
e6dc783a | 842 | |
4fe74b1c PB |
843 | err = scsi_add_host(shost, &vdev->dev); |
844 | if (err) | |
845 | goto scsi_add_host_failed; | |
5d8f16d0 MT |
846 | |
847 | virtio_device_ready(vdev); | |
848 | ||
849 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
850 | virtscsi_kick_event_all(vscsi); | |
851 | ||
852 | scsi_scan_host(shost); | |
4fe74b1c PB |
853 | return 0; |
854 | ||
855 | scsi_add_host_failed: | |
856 | vdev->config->del_vqs(vdev); | |
857 | virtscsi_init_failed: | |
858 | scsi_host_put(shost); | |
859 | return err; | |
860 | } | |
861 | ||
6f039790 | 862 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
863 | { |
864 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
865 | struct virtio_scsi *vscsi = shost_priv(shost); |
866 | ||
867 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
868 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
869 | |
870 | scsi_remove_host(shost); | |
4fe74b1c PB |
871 | virtscsi_remove_vqs(vdev); |
872 | scsi_host_put(shost); | |
873 | } | |
874 | ||
89107000 | 875 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
876 | static int virtscsi_freeze(struct virtio_device *vdev) |
877 | { | |
878 | virtscsi_remove_vqs(vdev); | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static int virtscsi_restore(struct virtio_device *vdev) | |
883 | { | |
884 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
885 | struct virtio_scsi *vscsi = shost_priv(sh); | |
f466f753 AH |
886 | int err; |
887 | ||
888 | err = virtscsi_init(vdev, vscsi); | |
889 | if (err) | |
890 | return err; | |
891 | ||
52c9cf1a MT |
892 | virtio_device_ready(vdev); |
893 | ||
cd679048 MT |
894 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
895 | virtscsi_kick_event_all(vscsi); | |
4fe74b1c | 896 | |
f466f753 | 897 | return err; |
4fe74b1c PB |
898 | } |
899 | #endif | |
900 | ||
901 | static struct virtio_device_id id_table[] = { | |
902 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
903 | { 0 }, | |
904 | }; | |
905 | ||
365a7150 | 906 | static unsigned int features[] = { |
865b58c0 PB |
907 | VIRTIO_SCSI_F_HOTPLUG, |
908 | VIRTIO_SCSI_F_CHANGE, | |
c5c2567f | 909 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 910 | VIRTIO_SCSI_F_T10_PI, |
c5c2567f | 911 | #endif |
365a7150 CM |
912 | }; |
913 | ||
4fe74b1c | 914 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
915 | .feature_table = features, |
916 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
917 | .driver.name = KBUILD_MODNAME, |
918 | .driver.owner = THIS_MODULE, | |
919 | .id_table = id_table, | |
920 | .probe = virtscsi_probe, | |
89107000 | 921 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
922 | .freeze = virtscsi_freeze, |
923 | .restore = virtscsi_restore, | |
924 | #endif | |
6f039790 | 925 | .remove = virtscsi_remove, |
4fe74b1c PB |
926 | }; |
927 | ||
928 | static int __init init(void) | |
929 | { | |
930 | int ret = -ENOMEM; | |
931 | ||
932 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
933 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 934 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
935 | goto error; |
936 | } | |
937 | ||
938 | ||
939 | virtscsi_cmd_pool = | |
940 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
941 | virtscsi_cmd_cache); | |
942 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 943 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
944 | goto error; |
945 | } | |
946 | ret = register_virtio_driver(&virtio_scsi_driver); | |
947 | if (ret < 0) | |
948 | goto error; | |
949 | ||
950 | return 0; | |
951 | ||
952 | error: | |
953 | if (virtscsi_cmd_pool) { | |
954 | mempool_destroy(virtscsi_cmd_pool); | |
955 | virtscsi_cmd_pool = NULL; | |
956 | } | |
957 | if (virtscsi_cmd_cache) { | |
958 | kmem_cache_destroy(virtscsi_cmd_cache); | |
959 | virtscsi_cmd_cache = NULL; | |
960 | } | |
961 | return ret; | |
962 | } | |
963 | ||
964 | static void __exit fini(void) | |
965 | { | |
966 | unregister_virtio_driver(&virtio_scsi_driver); | |
967 | mempool_destroy(virtscsi_cmd_pool); | |
968 | kmem_cache_destroy(virtscsi_cmd_cache); | |
969 | } | |
970 | module_init(init); | |
971 | module_exit(fini); | |
972 | ||
973 | MODULE_DEVICE_TABLE(virtio, id_table); | |
974 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
975 | MODULE_LICENSE("GPL"); |