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f33f5fe2 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
4fe74b1c PB |
2 | /* |
3 | * Virtio SCSI HBA driver | |
4 | * | |
5 | * Copyright IBM Corp. 2010 | |
6 | * Copyright Red Hat, Inc. 2011 | |
7 | * | |
8 | * Authors: | |
9 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | |
10 | * Paolo Bonzini <pbonzini@redhat.com> | |
4fe74b1c PB |
11 | */ |
12 | ||
ba06d1e1 WG |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
4fe74b1c PB |
15 | #include <linux/module.h> |
16 | #include <linux/slab.h> | |
17 | #include <linux/mempool.h> | |
0d9f0a52 | 18 | #include <linux/interrupt.h> |
4fe74b1c PB |
19 | #include <linux/virtio.h> |
20 | #include <linux/virtio_ids.h> | |
21 | #include <linux/virtio_config.h> | |
22 | #include <linux/virtio_scsi.h> | |
9141a4ca | 23 | #include <linux/cpu.h> |
e6dc783a | 24 | #include <linux/blkdev.h> |
4fe74b1c PB |
25 | #include <scsi/scsi_host.h> |
26 | #include <scsi/scsi_device.h> | |
27 | #include <scsi/scsi_cmnd.h> | |
761f1193 | 28 | #include <scsi/scsi_tcq.h> |
25d1d50e | 29 | #include <scsi/scsi_devinfo.h> |
938ece71 | 30 | #include <linux/seqlock.h> |
0d9f0a52 | 31 | #include <linux/blk-mq-virtio.h> |
4fe74b1c PB |
32 | |
33 | #define VIRTIO_SCSI_MEMPOOL_SZ 64 | |
365a7150 | 34 | #define VIRTIO_SCSI_EVENT_LEN 8 |
9141a4ca | 35 | #define VIRTIO_SCSI_VQ_BASE 2 |
4fe74b1c PB |
36 | |
37 | /* Command queue element */ | |
38 | struct virtio_scsi_cmd { | |
39 | struct scsi_cmnd *sc; | |
40 | struct completion *comp; | |
41 | union { | |
42 | struct virtio_scsi_cmd_req cmd; | |
e6dc783a | 43 | struct virtio_scsi_cmd_req_pi cmd_pi; |
4fe74b1c PB |
44 | struct virtio_scsi_ctrl_tmf_req tmf; |
45 | struct virtio_scsi_ctrl_an_req an; | |
46 | } req; | |
47 | union { | |
48 | struct virtio_scsi_cmd_resp cmd; | |
49 | struct virtio_scsi_ctrl_tmf_resp tmf; | |
50 | struct virtio_scsi_ctrl_an_resp an; | |
51 | struct virtio_scsi_event evt; | |
52 | } resp; | |
53 | } ____cacheline_aligned_in_smp; | |
54 | ||
365a7150 CM |
55 | struct virtio_scsi_event_node { |
56 | struct virtio_scsi *vscsi; | |
57 | struct virtio_scsi_event event; | |
58 | struct work_struct work; | |
59 | }; | |
60 | ||
139fe45a PB |
61 | struct virtio_scsi_vq { |
62 | /* Protects vq */ | |
63 | spinlock_t vq_lock; | |
64 | ||
65 | struct virtqueue *vq; | |
66 | }; | |
67 | ||
4fe74b1c PB |
68 | /* Driver instance state */ |
69 | struct virtio_scsi { | |
4fe74b1c | 70 | struct virtio_device *vdev; |
2bd37f0f | 71 | |
365a7150 CM |
72 | /* Get some buffers ready for event vq */ |
73 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
9141a4ca PB |
74 | |
75 | u32 num_queues; | |
76 | ||
77 | /* If the affinity hint is set for virtqueues */ | |
78 | bool affinity_hint_set; | |
79 | ||
8904f5a5 | 80 | struct hlist_node node; |
285e71ea | 81 | |
e67423c7 MT |
82 | /* Protected by event_vq lock */ |
83 | bool stop_events; | |
84 | ||
9141a4ca PB |
85 | struct virtio_scsi_vq ctrl_vq; |
86 | struct virtio_scsi_vq event_vq; | |
87 | struct virtio_scsi_vq req_vqs[]; | |
4fe74b1c PB |
88 | }; |
89 | ||
90 | static struct kmem_cache *virtscsi_cmd_cache; | |
91 | static mempool_t *virtscsi_cmd_pool; | |
92 | ||
93 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
94 | { | |
95 | return vdev->priv; | |
96 | } | |
97 | ||
98 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
99 | { | |
ae3d56d8 | 100 | if (resid) |
4fe74b1c | 101 | scsi_set_resid(sc, resid); |
4fe74b1c PB |
102 | } |
103 | ||
104 | /** | |
105 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
106 | * | |
107 | * Called with vq_lock held. | |
108 | */ | |
7f82b3c9 | 109 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
110 | { |
111 | struct virtio_scsi_cmd *cmd = buf; | |
112 | struct scsi_cmnd *sc = cmd->sc; | |
113 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
114 | ||
115 | dev_dbg(&sc->device->sdev_gendev, | |
116 | "cmd %p response %u status %#02x sense_len %u\n", | |
117 | sc, resp->response, resp->status, resp->sense_len); | |
118 | ||
119 | sc->result = resp->status; | |
d75dff39 | 120 | virtscsi_compute_resid(sc, virtio32_to_cpu(vscsi->vdev, resp->resid)); |
4fe74b1c PB |
121 | switch (resp->response) { |
122 | case VIRTIO_SCSI_S_OK: | |
123 | set_host_byte(sc, DID_OK); | |
124 | break; | |
125 | case VIRTIO_SCSI_S_OVERRUN: | |
126 | set_host_byte(sc, DID_ERROR); | |
127 | break; | |
128 | case VIRTIO_SCSI_S_ABORTED: | |
129 | set_host_byte(sc, DID_ABORT); | |
130 | break; | |
131 | case VIRTIO_SCSI_S_BAD_TARGET: | |
132 | set_host_byte(sc, DID_BAD_TARGET); | |
133 | break; | |
134 | case VIRTIO_SCSI_S_RESET: | |
135 | set_host_byte(sc, DID_RESET); | |
136 | break; | |
137 | case VIRTIO_SCSI_S_BUSY: | |
138 | set_host_byte(sc, DID_BUS_BUSY); | |
139 | break; | |
140 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
141 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
142 | break; | |
143 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
144 | set_host_byte(sc, DID_TARGET_FAILURE); | |
145 | break; | |
146 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
147 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
148 | break; | |
149 | default: | |
150 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
151 | resp->response); | |
152 | /* fall through */ | |
153 | case VIRTIO_SCSI_S_FAILURE: | |
154 | set_host_byte(sc, DID_ERROR); | |
155 | break; | |
156 | } | |
157 | ||
d75dff39 MT |
158 | WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) > |
159 | VIRTIO_SCSI_SENSE_SIZE); | |
4fe74b1c PB |
160 | if (sc->sense_buffer) { |
161 | memcpy(sc->sense_buffer, resp->sense, | |
d75dff39 MT |
162 | min_t(u32, |
163 | virtio32_to_cpu(vscsi->vdev, resp->sense_len), | |
164 | VIRTIO_SCSI_SENSE_SIZE)); | |
4fe74b1c PB |
165 | if (resp->sense_len) |
166 | set_driver_byte(sc, DRIVER_SENSE); | |
167 | } | |
168 | ||
4fe74b1c PB |
169 | sc->scsi_done(sc); |
170 | } | |
171 | ||
10f34f64 PB |
172 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
173 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 174 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 175 | { |
4fe74b1c | 176 | void *buf; |
4fe74b1c | 177 | unsigned int len; |
10f34f64 PB |
178 | unsigned long flags; |
179 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 180 | |
10f34f64 | 181 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
182 | do { |
183 | virtqueue_disable_cb(vq); | |
184 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 185 | fn(vscsi, buf); |
2bf4fd31 HG |
186 | |
187 | if (unlikely(virtqueue_is_broken(vq))) | |
188 | break; | |
4fe74b1c | 189 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 190 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
191 | } |
192 | ||
193 | static void virtscsi_req_done(struct virtqueue *vq) | |
194 | { | |
139fe45a PB |
195 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
196 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
197 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
198 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
199 | ||
9141a4ca | 200 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); |
4fe74b1c PB |
201 | }; |
202 | ||
8faeb529 PB |
203 | static void virtscsi_poll_requests(struct virtio_scsi *vscsi) |
204 | { | |
205 | int i, num_vqs; | |
206 | ||
207 | num_vqs = vscsi->num_queues; | |
208 | for (i = 0; i < num_vqs; i++) | |
209 | virtscsi_vq_done(vscsi, &vscsi->req_vqs[i], | |
210 | virtscsi_complete_cmd); | |
211 | } | |
212 | ||
7f82b3c9 | 213 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
214 | { |
215 | struct virtio_scsi_cmd *cmd = buf; | |
216 | ||
217 | if (cmd->comp) | |
e8f81420 | 218 | complete(cmd->comp); |
4fe74b1c PB |
219 | } |
220 | ||
221 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
222 | { | |
139fe45a PB |
223 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
224 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 225 | |
10f34f64 | 226 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
227 | }; |
228 | ||
cdda0e5a PB |
229 | static void virtscsi_handle_event(struct work_struct *work); |
230 | ||
365a7150 CM |
231 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
232 | struct virtio_scsi_event_node *event_node) | |
233 | { | |
4614e51c | 234 | int err; |
365a7150 CM |
235 | struct scatterlist sg; |
236 | unsigned long flags; | |
237 | ||
cdda0e5a | 238 | INIT_WORK(&event_node->work, virtscsi_handle_event); |
2e9c9dfd | 239 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
240 | |
241 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
242 | ||
bf958291 RR |
243 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
244 | GFP_ATOMIC); | |
4614e51c | 245 | if (!err) |
365a7150 CM |
246 | virtqueue_kick(vscsi->event_vq.vq); |
247 | ||
248 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
249 | ||
4614e51c | 250 | return err; |
365a7150 CM |
251 | } |
252 | ||
253 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
254 | { | |
255 | int i; | |
256 | ||
257 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
258 | vscsi->event_list[i].vscsi = vscsi; | |
259 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
260 | } | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
266 | { | |
267 | int i; | |
268 | ||
e67423c7 MT |
269 | /* Stop scheduling work before calling cancel_work_sync. */ |
270 | spin_lock_irq(&vscsi->event_vq.vq_lock); | |
271 | vscsi->stop_events = true; | |
272 | spin_unlock_irq(&vscsi->event_vq.vq_lock); | |
273 | ||
365a7150 CM |
274 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) |
275 | cancel_work_sync(&vscsi->event_list[i].work); | |
276 | } | |
277 | ||
278 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 279 | struct virtio_scsi_event *event) |
365a7150 CM |
280 | { |
281 | struct scsi_device *sdev; | |
282 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
283 | unsigned int target = event->lun[1]; | |
284 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
285 | ||
d75dff39 | 286 | switch (virtio32_to_cpu(vscsi->vdev, event->reason)) { |
365a7150 CM |
287 | case VIRTIO_SCSI_EVT_RESET_RESCAN: |
288 | scsi_add_device(shost, 0, target, lun); | |
289 | break; | |
290 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
291 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
292 | if (sdev) { | |
293 | scsi_remove_device(sdev); | |
294 | scsi_device_put(sdev); | |
295 | } else { | |
296 | pr_err("SCSI device %d 0 %d %d not found\n", | |
297 | shost->host_no, target, lun); | |
298 | } | |
299 | break; | |
300 | default: | |
301 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
302 | } | |
303 | } | |
304 | ||
865b58c0 PB |
305 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
306 | struct virtio_scsi_event *event) | |
307 | { | |
308 | struct scsi_device *sdev; | |
309 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
310 | unsigned int target = event->lun[1]; | |
311 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
d75dff39 MT |
312 | u8 asc = virtio32_to_cpu(vscsi->vdev, event->reason) & 255; |
313 | u8 ascq = virtio32_to_cpu(vscsi->vdev, event->reason) >> 8; | |
865b58c0 PB |
314 | |
315 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
316 | if (!sdev) { | |
317 | pr_err("SCSI device %d 0 %d %d not found\n", | |
318 | shost->host_no, target, lun); | |
319 | return; | |
320 | } | |
321 | ||
322 | /* Handle "Parameters changed", "Mode parameters changed", and | |
323 | "Capacity data has changed". */ | |
324 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
325 | scsi_rescan_device(&sdev->sdev_gendev); | |
326 | ||
327 | scsi_device_put(sdev); | |
328 | } | |
329 | ||
365a7150 CM |
330 | static void virtscsi_handle_event(struct work_struct *work) |
331 | { | |
332 | struct virtio_scsi_event_node *event_node = | |
333 | container_of(work, struct virtio_scsi_event_node, work); | |
334 | struct virtio_scsi *vscsi = event_node->vscsi; | |
335 | struct virtio_scsi_event *event = &event_node->event; | |
336 | ||
d75dff39 MT |
337 | if (event->event & |
338 | cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) { | |
339 | event->event &= ~cpu_to_virtio32(vscsi->vdev, | |
340 | VIRTIO_SCSI_T_EVENTS_MISSED); | |
365a7150 CM |
341 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); |
342 | } | |
343 | ||
d75dff39 | 344 | switch (virtio32_to_cpu(vscsi->vdev, event->event)) { |
365a7150 CM |
345 | case VIRTIO_SCSI_T_NO_EVENT: |
346 | break; | |
347 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
348 | virtscsi_handle_transport_reset(vscsi, event); | |
349 | break; | |
865b58c0 PB |
350 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
351 | virtscsi_handle_param_change(vscsi, event); | |
352 | break; | |
365a7150 CM |
353 | default: |
354 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
355 | } | |
356 | virtscsi_kick_event(vscsi, event_node); | |
357 | } | |
358 | ||
7f82b3c9 | 359 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
360 | { |
361 | struct virtio_scsi_event_node *event_node = buf; | |
362 | ||
e67423c7 MT |
363 | if (!vscsi->stop_events) |
364 | queue_work(system_freezable_wq, &event_node->work); | |
365a7150 CM |
365 | } |
366 | ||
4fe74b1c PB |
367 | static void virtscsi_event_done(struct virtqueue *vq) |
368 | { | |
139fe45a PB |
369 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
370 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 371 | |
10f34f64 | 372 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
373 | }; |
374 | ||
4fe74b1c | 375 | /** |
682993b4 WG |
376 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue |
377 | * @vq : the struct virtqueue we're talking about | |
4fe74b1c | 378 | * @cmd : command structure |
4fe74b1c PB |
379 | * @req_size : size of the request buffer |
380 | * @resp_size : size of the response buffer | |
4fe74b1c | 381 | */ |
682993b4 WG |
382 | static int virtscsi_add_cmd(struct virtqueue *vq, |
383 | struct virtio_scsi_cmd *cmd, | |
c77fba9a | 384 | size_t req_size, size_t resp_size) |
4fe74b1c PB |
385 | { |
386 | struct scsi_cmnd *sc = cmd->sc; | |
e6dc783a | 387 | struct scatterlist *sgs[6], req, resp; |
682993b4 WG |
388 | struct sg_table *out, *in; |
389 | unsigned out_num = 0, in_num = 0; | |
390 | ||
391 | out = in = NULL; | |
392 | ||
393 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
394 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
ae3d56d8 | 395 | out = &sc->sdb.table; |
682993b4 | 396 | if (sc->sc_data_direction != DMA_TO_DEVICE) |
ae3d56d8 | 397 | in = &sc->sdb.table; |
682993b4 | 398 | } |
4fe74b1c | 399 | |
4fe74b1c | 400 | /* Request header. */ |
682993b4 WG |
401 | sg_init_one(&req, &cmd->req, req_size); |
402 | sgs[out_num++] = &req; | |
4fe74b1c PB |
403 | |
404 | /* Data-out buffer. */ | |
e6dc783a NB |
405 | if (out) { |
406 | /* Place WRITE protection SGLs before Data OUT payload */ | |
407 | if (scsi_prot_sg_count(sc)) | |
408 | sgs[out_num++] = scsi_prot_sglist(sc); | |
682993b4 | 409 | sgs[out_num++] = out->sgl; |
e6dc783a | 410 | } |
4fe74b1c PB |
411 | |
412 | /* Response header. */ | |
682993b4 WG |
413 | sg_init_one(&resp, &cmd->resp, resp_size); |
414 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
415 | |
416 | /* Data-in buffer */ | |
e6dc783a NB |
417 | if (in) { |
418 | /* Place READ protection SGLs before Data IN payload */ | |
419 | if (scsi_prot_sg_count(sc)) | |
420 | sgs[out_num + in_num++] = scsi_prot_sglist(sc); | |
682993b4 | 421 | sgs[out_num + in_num++] = in->sgl; |
e6dc783a | 422 | } |
4fe74b1c | 423 | |
c77fba9a | 424 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC); |
4fe74b1c PB |
425 | } |
426 | ||
682993b4 | 427 | static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, |
4fe74b1c | 428 | struct virtio_scsi_cmd *cmd, |
c77fba9a | 429 | size_t req_size, size_t resp_size) |
4fe74b1c | 430 | { |
4fe74b1c | 431 | unsigned long flags; |
4614e51c RR |
432 | int err; |
433 | bool needs_kick = false; | |
4fe74b1c | 434 | |
682993b4 | 435 | spin_lock_irqsave(&vq->vq_lock, flags); |
c77fba9a | 436 | err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size); |
4614e51c RR |
437 | if (!err) |
438 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 439 | |
bce750b1 | 440 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 441 | |
4614e51c | 442 | if (needs_kick) |
139fe45a | 443 | virtqueue_notify(vq->vq); |
4614e51c | 444 | return err; |
4fe74b1c PB |
445 | } |
446 | ||
d75dff39 MT |
447 | static void virtio_scsi_init_hdr(struct virtio_device *vdev, |
448 | struct virtio_scsi_cmd_req *cmd, | |
e6dc783a NB |
449 | struct scsi_cmnd *sc) |
450 | { | |
451 | cmd->lun[0] = 1; | |
452 | cmd->lun[1] = sc->device->id; | |
453 | cmd->lun[2] = (sc->device->lun >> 8) | 0x40; | |
454 | cmd->lun[3] = sc->device->lun & 0xff; | |
d75dff39 | 455 | cmd->tag = cpu_to_virtio64(vdev, (unsigned long)sc); |
e6dc783a NB |
456 | cmd->task_attr = VIRTIO_SCSI_S_SIMPLE; |
457 | cmd->prio = 0; | |
458 | cmd->crn = 0; | |
459 | } | |
460 | ||
c5c2567f | 461 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
d75dff39 MT |
462 | static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev, |
463 | struct virtio_scsi_cmd_req_pi *cmd_pi, | |
e6dc783a NB |
464 | struct scsi_cmnd *sc) |
465 | { | |
466 | struct request *rq = sc->request; | |
467 | struct blk_integrity *bi; | |
468 | ||
d75dff39 | 469 | virtio_scsi_init_hdr(vdev, (struct virtio_scsi_cmd_req *)cmd_pi, sc); |
e6dc783a NB |
470 | |
471 | if (!rq || !scsi_prot_sg_count(sc)) | |
472 | return; | |
473 | ||
474 | bi = blk_get_integrity(rq->rq_disk); | |
475 | ||
476 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
d75dff39 | 477 | cmd_pi->pi_bytesout = cpu_to_virtio32(vdev, |
cdcdcaae GE |
478 | bio_integrity_bytes(bi, |
479 | blk_rq_sectors(rq))); | |
e6dc783a | 480 | else if (sc->sc_data_direction == DMA_FROM_DEVICE) |
d75dff39 | 481 | cmd_pi->pi_bytesin = cpu_to_virtio32(vdev, |
cdcdcaae GE |
482 | bio_integrity_bytes(bi, |
483 | blk_rq_sectors(rq))); | |
e6dc783a | 484 | } |
c5c2567f | 485 | #endif |
e6dc783a | 486 | |
c3506df8 ML |
487 | static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi, |
488 | struct scsi_cmnd *sc) | |
489 | { | |
490 | u32 tag = blk_mq_unique_tag(sc->request); | |
491 | u16 hwq = blk_mq_unique_tag_to_hwq(tag); | |
492 | ||
493 | return &vscsi->req_vqs[hwq]; | |
494 | } | |
495 | ||
496 | static int virtscsi_queuecommand(struct Scsi_Host *shost, | |
9141a4ca | 497 | struct scsi_cmnd *sc) |
4fe74b1c | 498 | { |
c3506df8 ML |
499 | struct virtio_scsi *vscsi = shost_priv(shost); |
500 | struct virtio_scsi_vq *req_vq = virtscsi_pick_vq_mq(vscsi, sc); | |
b54197c4 | 501 | struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc); |
773c7220 | 502 | unsigned long flags; |
ed9ea4ed | 503 | int req_size; |
773c7220 | 504 | int ret; |
b54197c4 | 505 | |
2bd37f0f PB |
506 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
507 | ||
508 | /* TODO: check feature bit and fail if unsupported? */ | |
509 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
510 | ||
4fe74b1c PB |
511 | dev_dbg(&sc->device->sdev_gendev, |
512 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
513 | ||
4fe74b1c | 514 | cmd->sc = sc; |
4fe74b1c PB |
515 | |
516 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
4fe74b1c | 517 | |
c5c2567f | 518 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 519 | if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) { |
d75dff39 | 520 | virtio_scsi_init_hdr_pi(vscsi->vdev, &cmd->req.cmd_pi, sc); |
e6dc783a NB |
521 | memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len); |
522 | req_size = sizeof(cmd->req.cmd_pi); | |
c5c2567f CH |
523 | } else |
524 | #endif | |
525 | { | |
d75dff39 | 526 | virtio_scsi_init_hdr(vscsi->vdev, &cmd->req.cmd, sc); |
e6dc783a NB |
527 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); |
528 | req_size = sizeof(cmd->req.cmd); | |
529 | } | |
530 | ||
773c7220 EF |
531 | ret = virtscsi_kick_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd)); |
532 | if (ret == -EIO) { | |
533 | cmd->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; | |
534 | spin_lock_irqsave(&req_vq->vq_lock, flags); | |
535 | virtscsi_complete_cmd(vscsi, cmd); | |
536 | spin_unlock_irqrestore(&req_vq->vq_lock, flags); | |
537 | } else if (ret != 0) { | |
b54197c4 | 538 | return SCSI_MLQUEUE_HOST_BUSY; |
773c7220 | 539 | } |
b54197c4 | 540 | return 0; |
4fe74b1c PB |
541 | } |
542 | ||
543 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) | |
544 | { | |
545 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 546 | int ret = FAILED; |
4fe74b1c PB |
547 | |
548 | cmd->comp = ∁ | |
682993b4 | 549 | if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd, |
c77fba9a | 550 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf) < 0) |
e4594bb5 | 551 | goto out; |
4fe74b1c PB |
552 | |
553 | wait_for_completion(&comp); | |
e4594bb5 PB |
554 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
555 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
556 | ret = SUCCESS; | |
4fe74b1c | 557 | |
8faeb529 PB |
558 | /* |
559 | * The spec guarantees that all requests related to the TMF have | |
560 | * been completed, but the callback might not have run yet if | |
561 | * we're using independent interrupts (e.g. MSI). Poll the | |
562 | * virtqueues once. | |
563 | * | |
564 | * In the abort case, sc->scsi_done will do nothing, because | |
565 | * the block layer must have detected a timeout and as a result | |
566 | * REQ_ATOM_COMPLETE has been set. | |
567 | */ | |
568 | virtscsi_poll_requests(vscsi); | |
569 | ||
e4594bb5 PB |
570 | out: |
571 | mempool_free(cmd, virtscsi_cmd_pool); | |
572 | return ret; | |
4fe74b1c PB |
573 | } |
574 | ||
575 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
576 | { | |
577 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
578 | struct virtio_scsi_cmd *cmd; | |
579 | ||
580 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
581 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
582 | if (!cmd) | |
583 | return FAILED; | |
584 | ||
585 | memset(cmd, 0, sizeof(*cmd)); | |
4fe74b1c PB |
586 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
587 | .type = VIRTIO_SCSI_T_TMF, | |
d75dff39 MT |
588 | .subtype = cpu_to_virtio32(vscsi->vdev, |
589 | VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET), | |
4fe74b1c PB |
590 | .lun[0] = 1, |
591 | .lun[1] = sc->device->id, | |
592 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
593 | .lun[3] = sc->device->lun & 0xff, | |
594 | }; | |
595 | return virtscsi_tmf(vscsi, cmd); | |
596 | } | |
597 | ||
25d1d50e DG |
598 | static int virtscsi_device_alloc(struct scsi_device *sdevice) |
599 | { | |
600 | /* | |
601 | * Passed through SCSI targets (e.g. with qemu's 'scsi-block') | |
602 | * may have transfer limits which come from the host SCSI | |
603 | * controller or something on the host side other than the | |
604 | * target itself. | |
605 | * | |
606 | * To make this work properly, the hypervisor can adjust the | |
607 | * target's VPD information to advertise these limits. But | |
608 | * for that to work, the guest has to look at the VPD pages, | |
609 | * which we won't do by default if it is an SPC-2 device, even | |
610 | * if it does actually support it. | |
611 | * | |
612 | * So, set the blist to always try to read the VPD pages. | |
613 | */ | |
614 | sdevice->sdev_bflags = BLIST_TRY_VPD_PAGES; | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
619 | ||
761f1193 VS |
620 | /** |
621 | * virtscsi_change_queue_depth() - Change a virtscsi target's queue depth | |
622 | * @sdev: Virtscsi target whose queue depth to change | |
623 | * @qdepth: New queue depth | |
761f1193 | 624 | */ |
db5ed4df | 625 | static int virtscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
761f1193 VS |
626 | { |
627 | struct Scsi_Host *shost = sdev->host; | |
628 | int max_depth = shost->cmd_per_lun; | |
629 | ||
db5ed4df | 630 | return scsi_change_queue_depth(sdev, min(max_depth, qdepth)); |
761f1193 VS |
631 | } |
632 | ||
4fe74b1c PB |
633 | static int virtscsi_abort(struct scsi_cmnd *sc) |
634 | { | |
635 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
636 | struct virtio_scsi_cmd *cmd; | |
637 | ||
638 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
639 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
640 | if (!cmd) | |
641 | return FAILED; | |
642 | ||
643 | memset(cmd, 0, sizeof(*cmd)); | |
4fe74b1c PB |
644 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
645 | .type = VIRTIO_SCSI_T_TMF, | |
646 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
647 | .lun[0] = 1, | |
648 | .lun[1] = sc->device->id, | |
649 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
650 | .lun[3] = sc->device->lun & 0xff, | |
d75dff39 | 651 | .tag = cpu_to_virtio64(vscsi->vdev, (unsigned long)sc), |
4fe74b1c PB |
652 | }; |
653 | return virtscsi_tmf(vscsi, cmd); | |
654 | } | |
655 | ||
0d9f0a52 CH |
656 | static int virtscsi_map_queues(struct Scsi_Host *shost) |
657 | { | |
658 | struct virtio_scsi *vscsi = shost_priv(shost); | |
6343e3ef | 659 | struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT]; |
0d9f0a52 | 660 | |
ed76e329 | 661 | return blk_mq_virtio_map_queues(qmap, vscsi->vdev, 2); |
0d9f0a52 CH |
662 | } |
663 | ||
e72c9a2a PB |
664 | /* |
665 | * The host guarantees to respond to each command, although I/O | |
666 | * latencies might be higher than on bare metal. Reset the timer | |
667 | * unconditionally to give the host a chance to perform EH. | |
668 | */ | |
669 | static enum blk_eh_timer_return virtscsi_eh_timed_out(struct scsi_cmnd *scmnd) | |
670 | { | |
671 | return BLK_EH_RESET_TIMER; | |
672 | } | |
673 | ||
c3506df8 | 674 | static struct scsi_host_template virtscsi_host_template = { |
4fe74b1c PB |
675 | .module = THIS_MODULE, |
676 | .name = "Virtio SCSI HBA", | |
677 | .proc_name = "virtio_scsi", | |
4fe74b1c | 678 | .this_id = -1, |
b54197c4 | 679 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
c3506df8 | 680 | .queuecommand = virtscsi_queuecommand, |
761f1193 | 681 | .change_queue_depth = virtscsi_change_queue_depth, |
4fe74b1c PB |
682 | .eh_abort_handler = virtscsi_abort, |
683 | .eh_device_reset_handler = virtscsi_device_reset, | |
e72c9a2a | 684 | .eh_timed_out = virtscsi_eh_timed_out, |
a680f1d4 | 685 | .slave_alloc = virtscsi_device_alloc, |
4fe74b1c | 686 | |
4fe74b1c | 687 | .dma_boundary = UINT_MAX, |
0d9f0a52 | 688 | .map_queues = virtscsi_map_queues, |
c40ecc12 | 689 | .track_queue_depth = 1, |
b5b6e8c8 | 690 | .force_blk_mq = 1, |
4fe74b1c PB |
691 | }; |
692 | ||
693 | #define virtscsi_config_get(vdev, fld) \ | |
694 | ({ \ | |
695 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
855e0c52 | 696 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
697 | __val; \ |
698 | }) | |
699 | ||
700 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 701 | do { \ |
4fe74b1c | 702 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ |
855e0c52 RR |
703 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
704 | } while(0) | |
4fe74b1c | 705 | |
139fe45a PB |
706 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
707 | struct virtqueue *vq) | |
708 | { | |
709 | spin_lock_init(&virtscsi_vq->vq_lock); | |
710 | virtscsi_vq->vq = vq; | |
711 | } | |
712 | ||
2bd37f0f PB |
713 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
714 | { | |
2bd37f0f PB |
715 | /* Stop all the virtqueues. */ |
716 | vdev->config->reset(vdev); | |
2bd37f0f PB |
717 | vdev->config->del_vqs(vdev); |
718 | } | |
719 | ||
4fe74b1c | 720 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 721 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
722 | { |
723 | int err; | |
9141a4ca PB |
724 | u32 i; |
725 | u32 num_vqs; | |
726 | vq_callback_t **callbacks; | |
727 | const char **names; | |
728 | struct virtqueue **vqs; | |
0d9f0a52 | 729 | struct irq_affinity desc = { .pre_vectors = 2 }; |
9141a4ca PB |
730 | |
731 | num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE; | |
6da2ec56 KC |
732 | vqs = kmalloc_array(num_vqs, sizeof(struct virtqueue *), GFP_KERNEL); |
733 | callbacks = kmalloc_array(num_vqs, sizeof(vq_callback_t *), | |
734 | GFP_KERNEL); | |
735 | names = kmalloc_array(num_vqs, sizeof(char *), GFP_KERNEL); | |
9141a4ca PB |
736 | |
737 | if (!callbacks || !vqs || !names) { | |
738 | err = -ENOMEM; | |
739 | goto out; | |
740 | } | |
2bd37f0f | 741 | |
9141a4ca PB |
742 | callbacks[0] = virtscsi_ctrl_done; |
743 | callbacks[1] = virtscsi_event_done; | |
744 | names[0] = "control"; | |
745 | names[1] = "event"; | |
746 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) { | |
747 | callbacks[i] = virtscsi_req_done; | |
748 | names[i] = "request"; | |
749 | } | |
4fe74b1c PB |
750 | |
751 | /* Discover virtqueues and write information to configuration. */ | |
9b2bbdb2 | 752 | err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc); |
4fe74b1c | 753 | if (err) |
9141a4ca | 754 | goto out; |
4fe74b1c | 755 | |
139fe45a PB |
756 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
757 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
758 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
759 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
760 | vqs[i]); | |
761 | ||
4fe74b1c PB |
762 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); |
763 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 764 | |
9141a4ca PB |
765 | err = 0; |
766 | ||
767 | out: | |
768 | kfree(names); | |
769 | kfree(callbacks); | |
770 | kfree(vqs); | |
771 | if (err) | |
772 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 773 | return err; |
4fe74b1c PB |
774 | } |
775 | ||
6f039790 | 776 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
777 | { |
778 | struct Scsi_Host *shost; | |
779 | struct virtio_scsi *vscsi; | |
908a5544 | 780 | int err; |
2bd37f0f | 781 | u32 sg_elems, num_targets; |
4fe74b1c | 782 | u32 cmd_per_lun; |
9141a4ca | 783 | u32 num_queues; |
9141a4ca | 784 | |
8cab3cd6 MT |
785 | if (!vdev->config->get) { |
786 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
787 | __func__); | |
788 | return -EINVAL; | |
789 | } | |
790 | ||
9141a4ca PB |
791 | /* We need to know how many queues before we allocate. */ |
792 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
1978f30a | 793 | num_queues = min_t(unsigned int, nr_cpu_ids, num_queues); |
4fe74b1c | 794 | |
2bd37f0f | 795 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 796 | |
c3506df8 | 797 | shost = scsi_host_alloc(&virtscsi_host_template, |
9141a4ca | 798 | sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues); |
4fe74b1c PB |
799 | if (!shost) |
800 | return -ENOMEM; | |
801 | ||
2bd37f0f | 802 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
803 | shost->sg_tablesize = sg_elems; |
804 | vscsi = shost_priv(shost); | |
805 | vscsi->vdev = vdev; | |
9141a4ca | 806 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
807 | vdev->priv = shost; |
808 | ||
5c370194 | 809 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
810 | if (err) |
811 | goto virtscsi_init_failed; | |
812 | ||
582b0ab2 RJ |
813 | shost->can_queue = virtqueue_get_vring_size(vscsi->req_vqs[0].vq); |
814 | ||
4fe74b1c PB |
815 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
816 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
817 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
818 | |
819 | /* LUNs > 256 are reported with format 1, so they go in the range | |
820 | * 16640-32767. | |
821 | */ | |
822 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 823 | shost->max_id = num_targets; |
4fe74b1c PB |
824 | shost->max_channel = 0; |
825 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
ccbedf11 | 826 | shost->nr_hw_queues = num_queues; |
e6dc783a | 827 | |
c5c2567f | 828 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 829 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) { |
908a5544 SR |
830 | int host_prot; |
831 | ||
e6dc783a NB |
832 | host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | |
833 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | | |
834 | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; | |
835 | ||
836 | scsi_host_set_prot(shost, host_prot); | |
837 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
838 | } | |
c5c2567f | 839 | #endif |
e6dc783a | 840 | |
4fe74b1c PB |
841 | err = scsi_add_host(shost, &vdev->dev); |
842 | if (err) | |
843 | goto scsi_add_host_failed; | |
5d8f16d0 MT |
844 | |
845 | virtio_device_ready(vdev); | |
846 | ||
847 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
848 | virtscsi_kick_event_all(vscsi); | |
849 | ||
850 | scsi_scan_host(shost); | |
4fe74b1c PB |
851 | return 0; |
852 | ||
853 | scsi_add_host_failed: | |
854 | vdev->config->del_vqs(vdev); | |
855 | virtscsi_init_failed: | |
856 | scsi_host_put(shost); | |
857 | return err; | |
858 | } | |
859 | ||
6f039790 | 860 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
861 | { |
862 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
863 | struct virtio_scsi *vscsi = shost_priv(shost); |
864 | ||
865 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
866 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
867 | |
868 | scsi_remove_host(shost); | |
4fe74b1c PB |
869 | virtscsi_remove_vqs(vdev); |
870 | scsi_host_put(shost); | |
871 | } | |
872 | ||
89107000 | 873 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
874 | static int virtscsi_freeze(struct virtio_device *vdev) |
875 | { | |
876 | virtscsi_remove_vqs(vdev); | |
877 | return 0; | |
878 | } | |
879 | ||
880 | static int virtscsi_restore(struct virtio_device *vdev) | |
881 | { | |
882 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
883 | struct virtio_scsi *vscsi = shost_priv(sh); | |
f466f753 AH |
884 | int err; |
885 | ||
886 | err = virtscsi_init(vdev, vscsi); | |
887 | if (err) | |
888 | return err; | |
889 | ||
52c9cf1a MT |
890 | virtio_device_ready(vdev); |
891 | ||
cd679048 MT |
892 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
893 | virtscsi_kick_event_all(vscsi); | |
4fe74b1c | 894 | |
f466f753 | 895 | return err; |
4fe74b1c PB |
896 | } |
897 | #endif | |
898 | ||
899 | static struct virtio_device_id id_table[] = { | |
900 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
901 | { 0 }, | |
902 | }; | |
903 | ||
365a7150 | 904 | static unsigned int features[] = { |
865b58c0 PB |
905 | VIRTIO_SCSI_F_HOTPLUG, |
906 | VIRTIO_SCSI_F_CHANGE, | |
c5c2567f | 907 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 908 | VIRTIO_SCSI_F_T10_PI, |
c5c2567f | 909 | #endif |
365a7150 CM |
910 | }; |
911 | ||
4fe74b1c | 912 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
913 | .feature_table = features, |
914 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
915 | .driver.name = KBUILD_MODNAME, |
916 | .driver.owner = THIS_MODULE, | |
917 | .id_table = id_table, | |
918 | .probe = virtscsi_probe, | |
89107000 | 919 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
920 | .freeze = virtscsi_freeze, |
921 | .restore = virtscsi_restore, | |
922 | #endif | |
6f039790 | 923 | .remove = virtscsi_remove, |
4fe74b1c PB |
924 | }; |
925 | ||
926 | static int __init init(void) | |
927 | { | |
928 | int ret = -ENOMEM; | |
929 | ||
930 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
931 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 932 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
933 | goto error; |
934 | } | |
935 | ||
936 | ||
937 | virtscsi_cmd_pool = | |
938 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
939 | virtscsi_cmd_cache); | |
940 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 941 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
942 | goto error; |
943 | } | |
944 | ret = register_virtio_driver(&virtio_scsi_driver); | |
945 | if (ret < 0) | |
946 | goto error; | |
947 | ||
948 | return 0; | |
949 | ||
950 | error: | |
951 | if (virtscsi_cmd_pool) { | |
952 | mempool_destroy(virtscsi_cmd_pool); | |
953 | virtscsi_cmd_pool = NULL; | |
954 | } | |
955 | if (virtscsi_cmd_cache) { | |
956 | kmem_cache_destroy(virtscsi_cmd_cache); | |
957 | virtscsi_cmd_cache = NULL; | |
958 | } | |
959 | return ret; | |
960 | } | |
961 | ||
962 | static void __exit fini(void) | |
963 | { | |
964 | unregister_virtio_driver(&virtio_scsi_driver); | |
965 | mempool_destroy(virtscsi_cmd_pool); | |
966 | kmem_cache_destroy(virtscsi_cmd_cache); | |
967 | } | |
968 | module_init(init); | |
969 | module_exit(fini); | |
970 | ||
971 | MODULE_DEVICE_TABLE(virtio, id_table); | |
972 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
973 | MODULE_LICENSE("GPL"); |