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> |
e6dc783a | 26 | #include <linux/blkdev.h> |
4fe74b1c PB |
27 | #include <scsi/scsi_host.h> |
28 | #include <scsi/scsi_device.h> | |
29 | #include <scsi/scsi_cmnd.h> | |
761f1193 | 30 | #include <scsi/scsi_tcq.h> |
938ece71 | 31 | #include <linux/seqlock.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 | ||
9141a4ca PB |
68 | /* |
69 | * Per-target queue state. | |
70 | * | |
71 | * This struct holds the data needed by the queue steering policy. When a | |
72 | * target is sent multiple requests, we need to drive them to the same queue so | |
73 | * that FIFO processing order is kept. However, if a target was idle, we can | |
74 | * choose a queue arbitrarily. In this case the queue is chosen according to | |
75 | * the current VCPU, so the driver expects the number of request queues to be | |
76 | * equal to the number of VCPUs. This makes it easy and fast to select the | |
77 | * queue, and also lets the driver optimize the IRQ affinity for the virtqueues | |
78 | * (each virtqueue's affinity is set to the CPU that "owns" the queue). | |
79 | * | |
938ece71 | 80 | * tgt_seq is held to serialize reading and writing req_vq. |
9141a4ca | 81 | * |
f259d9bd ML |
82 | * Decrements of reqs are never concurrent with writes of req_vq: before the |
83 | * decrement reqs will be != 0; after the decrement the virtqueue completion | |
84 | * routine will not use the req_vq so it can be changed by a new request. | |
938ece71 | 85 | * Thus they can happen outside the tgt_seq, provided of course we make reqs |
9141a4ca PB |
86 | * an atomic_t. |
87 | */ | |
2bd37f0f | 88 | struct virtio_scsi_target_state { |
938ece71 | 89 | seqcount_t tgt_seq; |
9141a4ca PB |
90 | |
91 | /* Count of outstanding requests. */ | |
92 | atomic_t reqs; | |
93 | ||
94 | /* Currently active virtqueue for requests sent to this target. */ | |
95 | struct virtio_scsi_vq *req_vq; | |
2bd37f0f PB |
96 | }; |
97 | ||
4fe74b1c PB |
98 | /* Driver instance state */ |
99 | struct virtio_scsi { | |
4fe74b1c | 100 | struct virtio_device *vdev; |
2bd37f0f | 101 | |
365a7150 CM |
102 | /* Get some buffers ready for event vq */ |
103 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
9141a4ca PB |
104 | |
105 | u32 num_queues; | |
106 | ||
107 | /* If the affinity hint is set for virtqueues */ | |
108 | bool affinity_hint_set; | |
109 | ||
285e71ea WG |
110 | /* CPU hotplug notifier */ |
111 | struct notifier_block nb; | |
112 | ||
e67423c7 MT |
113 | /* Protected by event_vq lock */ |
114 | bool stop_events; | |
115 | ||
9141a4ca PB |
116 | struct virtio_scsi_vq ctrl_vq; |
117 | struct virtio_scsi_vq event_vq; | |
118 | struct virtio_scsi_vq req_vqs[]; | |
4fe74b1c PB |
119 | }; |
120 | ||
121 | static struct kmem_cache *virtscsi_cmd_cache; | |
122 | static mempool_t *virtscsi_cmd_pool; | |
123 | ||
124 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
125 | { | |
126 | return vdev->priv; | |
127 | } | |
128 | ||
129 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
130 | { | |
131 | if (!resid) | |
132 | return; | |
133 | ||
134 | if (!scsi_bidi_cmnd(sc)) { | |
135 | scsi_set_resid(sc, resid); | |
136 | return; | |
137 | } | |
138 | ||
139 | scsi_in(sc)->resid = min(resid, scsi_in(sc)->length); | |
140 | scsi_out(sc)->resid = resid - scsi_in(sc)->resid; | |
141 | } | |
142 | ||
143 | /** | |
144 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
145 | * | |
146 | * Called with vq_lock held. | |
147 | */ | |
7f82b3c9 | 148 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
149 | { |
150 | struct virtio_scsi_cmd *cmd = buf; | |
151 | struct scsi_cmnd *sc = cmd->sc; | |
152 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
9141a4ca PB |
153 | struct virtio_scsi_target_state *tgt = |
154 | scsi_target(sc->device)->hostdata; | |
4fe74b1c PB |
155 | |
156 | dev_dbg(&sc->device->sdev_gendev, | |
157 | "cmd %p response %u status %#02x sense_len %u\n", | |
158 | sc, resp->response, resp->status, resp->sense_len); | |
159 | ||
160 | sc->result = resp->status; | |
161 | virtscsi_compute_resid(sc, resp->resid); | |
162 | switch (resp->response) { | |
163 | case VIRTIO_SCSI_S_OK: | |
164 | set_host_byte(sc, DID_OK); | |
165 | break; | |
166 | case VIRTIO_SCSI_S_OVERRUN: | |
167 | set_host_byte(sc, DID_ERROR); | |
168 | break; | |
169 | case VIRTIO_SCSI_S_ABORTED: | |
170 | set_host_byte(sc, DID_ABORT); | |
171 | break; | |
172 | case VIRTIO_SCSI_S_BAD_TARGET: | |
173 | set_host_byte(sc, DID_BAD_TARGET); | |
174 | break; | |
175 | case VIRTIO_SCSI_S_RESET: | |
176 | set_host_byte(sc, DID_RESET); | |
177 | break; | |
178 | case VIRTIO_SCSI_S_BUSY: | |
179 | set_host_byte(sc, DID_BUS_BUSY); | |
180 | break; | |
181 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
182 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
183 | break; | |
184 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
185 | set_host_byte(sc, DID_TARGET_FAILURE); | |
186 | break; | |
187 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
188 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
189 | break; | |
190 | default: | |
191 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
192 | resp->response); | |
193 | /* fall through */ | |
194 | case VIRTIO_SCSI_S_FAILURE: | |
195 | set_host_byte(sc, DID_ERROR); | |
196 | break; | |
197 | } | |
198 | ||
199 | WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE); | |
200 | if (sc->sense_buffer) { | |
201 | memcpy(sc->sense_buffer, resp->sense, | |
202 | min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE)); | |
203 | if (resp->sense_len) | |
204 | set_driver_byte(sc, DRIVER_SENSE); | |
205 | } | |
206 | ||
4fe74b1c | 207 | sc->scsi_done(sc); |
9141a4ca PB |
208 | |
209 | atomic_dec(&tgt->reqs); | |
4fe74b1c PB |
210 | } |
211 | ||
10f34f64 PB |
212 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
213 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 214 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 215 | { |
4fe74b1c | 216 | void *buf; |
4fe74b1c | 217 | unsigned int len; |
10f34f64 PB |
218 | unsigned long flags; |
219 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 220 | |
10f34f64 | 221 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
222 | do { |
223 | virtqueue_disable_cb(vq); | |
224 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 225 | fn(vscsi, buf); |
2bf4fd31 HG |
226 | |
227 | if (unlikely(virtqueue_is_broken(vq))) | |
228 | break; | |
4fe74b1c | 229 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 230 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
231 | } |
232 | ||
233 | static void virtscsi_req_done(struct virtqueue *vq) | |
234 | { | |
139fe45a PB |
235 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
236 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
237 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
238 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
239 | ||
9141a4ca | 240 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); |
4fe74b1c PB |
241 | }; |
242 | ||
8faeb529 PB |
243 | static void virtscsi_poll_requests(struct virtio_scsi *vscsi) |
244 | { | |
245 | int i, num_vqs; | |
246 | ||
247 | num_vqs = vscsi->num_queues; | |
248 | for (i = 0; i < num_vqs; i++) | |
249 | virtscsi_vq_done(vscsi, &vscsi->req_vqs[i], | |
250 | virtscsi_complete_cmd); | |
251 | } | |
252 | ||
7f82b3c9 | 253 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
254 | { |
255 | struct virtio_scsi_cmd *cmd = buf; | |
256 | ||
257 | if (cmd->comp) | |
258 | complete_all(cmd->comp); | |
4fe74b1c PB |
259 | } |
260 | ||
261 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
262 | { | |
139fe45a PB |
263 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
264 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 265 | |
10f34f64 | 266 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
267 | }; |
268 | ||
cdda0e5a PB |
269 | static void virtscsi_handle_event(struct work_struct *work); |
270 | ||
365a7150 CM |
271 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
272 | struct virtio_scsi_event_node *event_node) | |
273 | { | |
4614e51c | 274 | int err; |
365a7150 CM |
275 | struct scatterlist sg; |
276 | unsigned long flags; | |
277 | ||
cdda0e5a | 278 | INIT_WORK(&event_node->work, virtscsi_handle_event); |
2e9c9dfd | 279 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
280 | |
281 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
282 | ||
bf958291 RR |
283 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
284 | GFP_ATOMIC); | |
4614e51c | 285 | if (!err) |
365a7150 CM |
286 | virtqueue_kick(vscsi->event_vq.vq); |
287 | ||
288 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
289 | ||
4614e51c | 290 | return err; |
365a7150 CM |
291 | } |
292 | ||
293 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
294 | { | |
295 | int i; | |
296 | ||
297 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
298 | vscsi->event_list[i].vscsi = vscsi; | |
299 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
300 | } | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
306 | { | |
307 | int i; | |
308 | ||
e67423c7 MT |
309 | /* Stop scheduling work before calling cancel_work_sync. */ |
310 | spin_lock_irq(&vscsi->event_vq.vq_lock); | |
311 | vscsi->stop_events = true; | |
312 | spin_unlock_irq(&vscsi->event_vq.vq_lock); | |
313 | ||
365a7150 CM |
314 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) |
315 | cancel_work_sync(&vscsi->event_list[i].work); | |
316 | } | |
317 | ||
318 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 319 | struct virtio_scsi_event *event) |
365a7150 CM |
320 | { |
321 | struct scsi_device *sdev; | |
322 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
323 | unsigned int target = event->lun[1]; | |
324 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
325 | ||
326 | switch (event->reason) { | |
327 | case VIRTIO_SCSI_EVT_RESET_RESCAN: | |
328 | scsi_add_device(shost, 0, target, lun); | |
329 | break; | |
330 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
331 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
332 | if (sdev) { | |
333 | scsi_remove_device(sdev); | |
334 | scsi_device_put(sdev); | |
335 | } else { | |
336 | pr_err("SCSI device %d 0 %d %d not found\n", | |
337 | shost->host_no, target, lun); | |
338 | } | |
339 | break; | |
340 | default: | |
341 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
342 | } | |
343 | } | |
344 | ||
865b58c0 PB |
345 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
346 | struct virtio_scsi_event *event) | |
347 | { | |
348 | struct scsi_device *sdev; | |
349 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
350 | unsigned int target = event->lun[1]; | |
351 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
352 | u8 asc = event->reason & 255; | |
353 | u8 ascq = event->reason >> 8; | |
354 | ||
355 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
356 | if (!sdev) { | |
357 | pr_err("SCSI device %d 0 %d %d not found\n", | |
358 | shost->host_no, target, lun); | |
359 | return; | |
360 | } | |
361 | ||
362 | /* Handle "Parameters changed", "Mode parameters changed", and | |
363 | "Capacity data has changed". */ | |
364 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
365 | scsi_rescan_device(&sdev->sdev_gendev); | |
366 | ||
367 | scsi_device_put(sdev); | |
368 | } | |
369 | ||
365a7150 CM |
370 | static void virtscsi_handle_event(struct work_struct *work) |
371 | { | |
372 | struct virtio_scsi_event_node *event_node = | |
373 | container_of(work, struct virtio_scsi_event_node, work); | |
374 | struct virtio_scsi *vscsi = event_node->vscsi; | |
375 | struct virtio_scsi_event *event = &event_node->event; | |
376 | ||
377 | if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) { | |
378 | event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED; | |
379 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); | |
380 | } | |
381 | ||
382 | switch (event->event) { | |
383 | case VIRTIO_SCSI_T_NO_EVENT: | |
384 | break; | |
385 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
386 | virtscsi_handle_transport_reset(vscsi, event); | |
387 | break; | |
865b58c0 PB |
388 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
389 | virtscsi_handle_param_change(vscsi, event); | |
390 | break; | |
365a7150 CM |
391 | default: |
392 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
393 | } | |
394 | virtscsi_kick_event(vscsi, event_node); | |
395 | } | |
396 | ||
7f82b3c9 | 397 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
398 | { |
399 | struct virtio_scsi_event_node *event_node = buf; | |
400 | ||
e67423c7 MT |
401 | if (!vscsi->stop_events) |
402 | queue_work(system_freezable_wq, &event_node->work); | |
365a7150 CM |
403 | } |
404 | ||
4fe74b1c PB |
405 | static void virtscsi_event_done(struct virtqueue *vq) |
406 | { | |
139fe45a PB |
407 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
408 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 409 | |
10f34f64 | 410 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
411 | }; |
412 | ||
4fe74b1c | 413 | /** |
682993b4 WG |
414 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue |
415 | * @vq : the struct virtqueue we're talking about | |
4fe74b1c | 416 | * @cmd : command structure |
4fe74b1c PB |
417 | * @req_size : size of the request buffer |
418 | * @resp_size : size of the response buffer | |
4fe74b1c | 419 | */ |
682993b4 WG |
420 | static int virtscsi_add_cmd(struct virtqueue *vq, |
421 | struct virtio_scsi_cmd *cmd, | |
c77fba9a | 422 | size_t req_size, size_t resp_size) |
4fe74b1c PB |
423 | { |
424 | struct scsi_cmnd *sc = cmd->sc; | |
e6dc783a | 425 | struct scatterlist *sgs[6], req, resp; |
682993b4 WG |
426 | struct sg_table *out, *in; |
427 | unsigned out_num = 0, in_num = 0; | |
428 | ||
429 | out = in = NULL; | |
430 | ||
431 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
432 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
433 | out = &scsi_out(sc)->table; | |
434 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
435 | in = &scsi_in(sc)->table; | |
436 | } | |
4fe74b1c | 437 | |
4fe74b1c | 438 | /* Request header. */ |
682993b4 WG |
439 | sg_init_one(&req, &cmd->req, req_size); |
440 | sgs[out_num++] = &req; | |
4fe74b1c PB |
441 | |
442 | /* Data-out buffer. */ | |
e6dc783a NB |
443 | if (out) { |
444 | /* Place WRITE protection SGLs before Data OUT payload */ | |
445 | if (scsi_prot_sg_count(sc)) | |
446 | sgs[out_num++] = scsi_prot_sglist(sc); | |
682993b4 | 447 | sgs[out_num++] = out->sgl; |
e6dc783a | 448 | } |
4fe74b1c PB |
449 | |
450 | /* Response header. */ | |
682993b4 WG |
451 | sg_init_one(&resp, &cmd->resp, resp_size); |
452 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
453 | |
454 | /* Data-in buffer */ | |
e6dc783a NB |
455 | if (in) { |
456 | /* Place READ protection SGLs before Data IN payload */ | |
457 | if (scsi_prot_sg_count(sc)) | |
458 | sgs[out_num + in_num++] = scsi_prot_sglist(sc); | |
682993b4 | 459 | sgs[out_num + in_num++] = in->sgl; |
e6dc783a | 460 | } |
4fe74b1c | 461 | |
c77fba9a | 462 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC); |
4fe74b1c PB |
463 | } |
464 | ||
682993b4 | 465 | static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, |
4fe74b1c | 466 | struct virtio_scsi_cmd *cmd, |
c77fba9a | 467 | size_t req_size, size_t resp_size) |
4fe74b1c | 468 | { |
4fe74b1c | 469 | unsigned long flags; |
4614e51c RR |
470 | int err; |
471 | bool needs_kick = false; | |
4fe74b1c | 472 | |
682993b4 | 473 | spin_lock_irqsave(&vq->vq_lock, flags); |
c77fba9a | 474 | err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size); |
4614e51c RR |
475 | if (!err) |
476 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 477 | |
bce750b1 | 478 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 479 | |
4614e51c | 480 | if (needs_kick) |
139fe45a | 481 | virtqueue_notify(vq->vq); |
4614e51c | 482 | return err; |
4fe74b1c PB |
483 | } |
484 | ||
e6dc783a NB |
485 | static void virtio_scsi_init_hdr(struct virtio_scsi_cmd_req *cmd, |
486 | struct scsi_cmnd *sc) | |
487 | { | |
488 | cmd->lun[0] = 1; | |
489 | cmd->lun[1] = sc->device->id; | |
490 | cmd->lun[2] = (sc->device->lun >> 8) | 0x40; | |
491 | cmd->lun[3] = sc->device->lun & 0xff; | |
492 | cmd->tag = (unsigned long)sc; | |
493 | cmd->task_attr = VIRTIO_SCSI_S_SIMPLE; | |
494 | cmd->prio = 0; | |
495 | cmd->crn = 0; | |
496 | } | |
497 | ||
498 | static void virtio_scsi_init_hdr_pi(struct virtio_scsi_cmd_req_pi *cmd_pi, | |
499 | struct scsi_cmnd *sc) | |
500 | { | |
501 | struct request *rq = sc->request; | |
502 | struct blk_integrity *bi; | |
503 | ||
504 | virtio_scsi_init_hdr((struct virtio_scsi_cmd_req *)cmd_pi, sc); | |
505 | ||
506 | if (!rq || !scsi_prot_sg_count(sc)) | |
507 | return; | |
508 | ||
509 | bi = blk_get_integrity(rq->rq_disk); | |
510 | ||
511 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
512 | cmd_pi->pi_bytesout = blk_rq_sectors(rq) * bi->tuple_size; | |
513 | else if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
514 | cmd_pi->pi_bytesin = blk_rq_sectors(rq) * bi->tuple_size; | |
515 | } | |
516 | ||
9141a4ca PB |
517 | static int virtscsi_queuecommand(struct virtio_scsi *vscsi, |
518 | struct virtio_scsi_vq *req_vq, | |
519 | struct scsi_cmnd *sc) | |
4fe74b1c | 520 | { |
2bd37f0f | 521 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
b54197c4 | 522 | struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc); |
ed9ea4ed | 523 | int req_size; |
b54197c4 | 524 | |
2bd37f0f PB |
525 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
526 | ||
527 | /* TODO: check feature bit and fail if unsupported? */ | |
528 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
529 | ||
4fe74b1c PB |
530 | dev_dbg(&sc->device->sdev_gendev, |
531 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
532 | ||
4fe74b1c PB |
533 | memset(cmd, 0, sizeof(*cmd)); |
534 | cmd->sc = sc; | |
4fe74b1c PB |
535 | |
536 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
4fe74b1c | 537 | |
e6dc783a NB |
538 | if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) { |
539 | virtio_scsi_init_hdr_pi(&cmd->req.cmd_pi, sc); | |
540 | memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len); | |
541 | req_size = sizeof(cmd->req.cmd_pi); | |
542 | } else { | |
543 | virtio_scsi_init_hdr(&cmd->req.cmd, sc); | |
544 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); | |
545 | req_size = sizeof(cmd->req.cmd); | |
546 | } | |
547 | ||
ed9ea4ed | 548 | if (virtscsi_kick_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd)) != 0) |
b54197c4 CH |
549 | return SCSI_MLQUEUE_HOST_BUSY; |
550 | return 0; | |
4fe74b1c PB |
551 | } |
552 | ||
9141a4ca PB |
553 | static int virtscsi_queuecommand_single(struct Scsi_Host *sh, |
554 | struct scsi_cmnd *sc) | |
555 | { | |
556 | struct virtio_scsi *vscsi = shost_priv(sh); | |
557 | struct virtio_scsi_target_state *tgt = | |
558 | scsi_target(sc->device)->hostdata; | |
559 | ||
560 | atomic_inc(&tgt->reqs); | |
561 | return virtscsi_queuecommand(vscsi, &vscsi->req_vqs[0], sc); | |
562 | } | |
563 | ||
ccbedf11 ML |
564 | static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi, |
565 | struct scsi_cmnd *sc) | |
566 | { | |
567 | u32 tag = blk_mq_unique_tag(sc->request); | |
568 | u16 hwq = blk_mq_unique_tag_to_hwq(tag); | |
569 | ||
570 | return &vscsi->req_vqs[hwq]; | |
571 | } | |
572 | ||
9141a4ca PB |
573 | static struct virtio_scsi_vq *virtscsi_pick_vq(struct virtio_scsi *vscsi, |
574 | struct virtio_scsi_target_state *tgt) | |
575 | { | |
576 | struct virtio_scsi_vq *vq; | |
577 | unsigned long flags; | |
578 | u32 queue_num; | |
579 | ||
938ece71 ML |
580 | local_irq_save(flags); |
581 | if (atomic_inc_return(&tgt->reqs) > 1) { | |
582 | unsigned long seq; | |
583 | ||
584 | do { | |
585 | seq = read_seqcount_begin(&tgt->tgt_seq); | |
586 | vq = tgt->req_vq; | |
587 | } while (read_seqcount_retry(&tgt->tgt_seq, seq)); | |
588 | } else { | |
589 | /* no writes can be concurrent because of atomic_t */ | |
590 | write_seqcount_begin(&tgt->tgt_seq); | |
591 | ||
592 | /* keep previous req_vq if a reader just arrived */ | |
593 | if (unlikely(atomic_read(&tgt->reqs) > 1)) { | |
594 | vq = tgt->req_vq; | |
595 | goto unlock; | |
596 | } | |
9141a4ca | 597 | |
9141a4ca PB |
598 | queue_num = smp_processor_id(); |
599 | while (unlikely(queue_num >= vscsi->num_queues)) | |
600 | queue_num -= vscsi->num_queues; | |
9141a4ca | 601 | tgt->req_vq = vq = &vscsi->req_vqs[queue_num]; |
938ece71 ML |
602 | unlock: |
603 | write_seqcount_end(&tgt->tgt_seq); | |
9141a4ca | 604 | } |
938ece71 | 605 | local_irq_restore(flags); |
9141a4ca | 606 | |
9141a4ca PB |
607 | return vq; |
608 | } | |
609 | ||
610 | static int virtscsi_queuecommand_multi(struct Scsi_Host *sh, | |
611 | struct scsi_cmnd *sc) | |
612 | { | |
613 | struct virtio_scsi *vscsi = shost_priv(sh); | |
614 | struct virtio_scsi_target_state *tgt = | |
615 | scsi_target(sc->device)->hostdata; | |
ccbedf11 ML |
616 | struct virtio_scsi_vq *req_vq; |
617 | ||
618 | if (shost_use_blk_mq(sh)) | |
619 | req_vq = virtscsi_pick_vq_mq(vscsi, sc); | |
620 | else | |
621 | req_vq = virtscsi_pick_vq(vscsi, tgt); | |
9141a4ca PB |
622 | |
623 | return virtscsi_queuecommand(vscsi, req_vq, sc); | |
624 | } | |
625 | ||
4fe74b1c PB |
626 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) |
627 | { | |
628 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 629 | int ret = FAILED; |
4fe74b1c PB |
630 | |
631 | cmd->comp = ∁ | |
682993b4 | 632 | if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd, |
c77fba9a | 633 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf) < 0) |
e4594bb5 | 634 | goto out; |
4fe74b1c PB |
635 | |
636 | wait_for_completion(&comp); | |
e4594bb5 PB |
637 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
638 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
639 | ret = SUCCESS; | |
4fe74b1c | 640 | |
8faeb529 PB |
641 | /* |
642 | * The spec guarantees that all requests related to the TMF have | |
643 | * been completed, but the callback might not have run yet if | |
644 | * we're using independent interrupts (e.g. MSI). Poll the | |
645 | * virtqueues once. | |
646 | * | |
647 | * In the abort case, sc->scsi_done will do nothing, because | |
648 | * the block layer must have detected a timeout and as a result | |
649 | * REQ_ATOM_COMPLETE has been set. | |
650 | */ | |
651 | virtscsi_poll_requests(vscsi); | |
652 | ||
e4594bb5 PB |
653 | out: |
654 | mempool_free(cmd, virtscsi_cmd_pool); | |
655 | return ret; | |
4fe74b1c PB |
656 | } |
657 | ||
658 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
659 | { | |
660 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
661 | struct virtio_scsi_cmd *cmd; | |
662 | ||
663 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
664 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
665 | if (!cmd) | |
666 | return FAILED; | |
667 | ||
668 | memset(cmd, 0, sizeof(*cmd)); | |
669 | cmd->sc = sc; | |
670 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
671 | .type = VIRTIO_SCSI_T_TMF, | |
672 | .subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET, | |
673 | .lun[0] = 1, | |
674 | .lun[1] = sc->device->id, | |
675 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
676 | .lun[3] = sc->device->lun & 0xff, | |
677 | }; | |
678 | return virtscsi_tmf(vscsi, cmd); | |
679 | } | |
680 | ||
761f1193 VS |
681 | /** |
682 | * virtscsi_change_queue_depth() - Change a virtscsi target's queue depth | |
683 | * @sdev: Virtscsi target whose queue depth to change | |
684 | * @qdepth: New queue depth | |
685 | * @reason: Reason for the queue depth change. | |
686 | */ | |
687 | static int virtscsi_change_queue_depth(struct scsi_device *sdev, | |
688 | int qdepth, | |
689 | int reason) | |
690 | { | |
691 | struct Scsi_Host *shost = sdev->host; | |
692 | int max_depth = shost->cmd_per_lun; | |
693 | ||
c40ecc12 | 694 | scsi_adjust_queue_depth(sdev, min(max_depth, qdepth)); |
761f1193 VS |
695 | return sdev->queue_depth; |
696 | } | |
697 | ||
4fe74b1c PB |
698 | static int virtscsi_abort(struct scsi_cmnd *sc) |
699 | { | |
700 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
701 | struct virtio_scsi_cmd *cmd; | |
702 | ||
703 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
704 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
705 | if (!cmd) | |
706 | return FAILED; | |
707 | ||
708 | memset(cmd, 0, sizeof(*cmd)); | |
709 | cmd->sc = sc; | |
710 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
711 | .type = VIRTIO_SCSI_T_TMF, | |
712 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
713 | .lun[0] = 1, | |
714 | .lun[1] = sc->device->id, | |
715 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
716 | .lun[3] = sc->device->lun & 0xff, | |
717 | .tag = (unsigned long)sc, | |
718 | }; | |
719 | return virtscsi_tmf(vscsi, cmd); | |
720 | } | |
721 | ||
5c370194 WG |
722 | static int virtscsi_target_alloc(struct scsi_target *starget) |
723 | { | |
938ece71 ML |
724 | struct Scsi_Host *sh = dev_to_shost(starget->dev.parent); |
725 | struct virtio_scsi *vscsi = shost_priv(sh); | |
726 | ||
5c370194 WG |
727 | struct virtio_scsi_target_state *tgt = |
728 | kmalloc(sizeof(*tgt), GFP_KERNEL); | |
729 | if (!tgt) | |
730 | return -ENOMEM; | |
731 | ||
938ece71 | 732 | seqcount_init(&tgt->tgt_seq); |
9141a4ca | 733 | atomic_set(&tgt->reqs, 0); |
938ece71 | 734 | tgt->req_vq = &vscsi->req_vqs[0]; |
5c370194 WG |
735 | |
736 | starget->hostdata = tgt; | |
737 | return 0; | |
738 | } | |
739 | ||
740 | static void virtscsi_target_destroy(struct scsi_target *starget) | |
741 | { | |
742 | struct virtio_scsi_target_state *tgt = starget->hostdata; | |
743 | kfree(tgt); | |
744 | } | |
745 | ||
9141a4ca PB |
746 | static struct scsi_host_template virtscsi_host_template_single = { |
747 | .module = THIS_MODULE, | |
748 | .name = "Virtio SCSI HBA", | |
749 | .proc_name = "virtio_scsi", | |
750 | .this_id = -1, | |
b54197c4 | 751 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca | 752 | .queuecommand = virtscsi_queuecommand_single, |
761f1193 | 753 | .change_queue_depth = virtscsi_change_queue_depth, |
9141a4ca PB |
754 | .eh_abort_handler = virtscsi_abort, |
755 | .eh_device_reset_handler = virtscsi_device_reset, | |
756 | ||
757 | .can_queue = 1024, | |
758 | .dma_boundary = UINT_MAX, | |
759 | .use_clustering = ENABLE_CLUSTERING, | |
760 | .target_alloc = virtscsi_target_alloc, | |
761 | .target_destroy = virtscsi_target_destroy, | |
c40ecc12 | 762 | .track_queue_depth = 1, |
9141a4ca PB |
763 | }; |
764 | ||
765 | static struct scsi_host_template virtscsi_host_template_multi = { | |
4fe74b1c PB |
766 | .module = THIS_MODULE, |
767 | .name = "Virtio SCSI HBA", | |
768 | .proc_name = "virtio_scsi", | |
4fe74b1c | 769 | .this_id = -1, |
b54197c4 | 770 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca | 771 | .queuecommand = virtscsi_queuecommand_multi, |
761f1193 | 772 | .change_queue_depth = virtscsi_change_queue_depth, |
4fe74b1c PB |
773 | .eh_abort_handler = virtscsi_abort, |
774 | .eh_device_reset_handler = virtscsi_device_reset, | |
775 | ||
776 | .can_queue = 1024, | |
777 | .dma_boundary = UINT_MAX, | |
778 | .use_clustering = ENABLE_CLUSTERING, | |
5c370194 WG |
779 | .target_alloc = virtscsi_target_alloc, |
780 | .target_destroy = virtscsi_target_destroy, | |
c40ecc12 | 781 | .track_queue_depth = 1, |
4fe74b1c PB |
782 | }; |
783 | ||
784 | #define virtscsi_config_get(vdev, fld) \ | |
785 | ({ \ | |
786 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
855e0c52 | 787 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
788 | __val; \ |
789 | }) | |
790 | ||
791 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 792 | do { \ |
4fe74b1c | 793 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ |
855e0c52 RR |
794 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
795 | } while(0) | |
4fe74b1c | 796 | |
9141a4ca PB |
797 | static void __virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) |
798 | { | |
799 | int i; | |
800 | int cpu; | |
801 | ||
802 | /* In multiqueue mode, when the number of cpu is equal | |
803 | * to the number of request queues, we let the qeueues | |
804 | * to be private to one cpu by setting the affinity hint | |
805 | * to eliminate the contention. | |
806 | */ | |
807 | if ((vscsi->num_queues == 1 || | |
808 | vscsi->num_queues != num_online_cpus()) && affinity) { | |
809 | if (vscsi->affinity_hint_set) | |
810 | affinity = false; | |
811 | else | |
812 | return; | |
813 | } | |
814 | ||
815 | if (affinity) { | |
816 | i = 0; | |
817 | for_each_online_cpu(cpu) { | |
818 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, cpu); | |
819 | i++; | |
820 | } | |
821 | ||
822 | vscsi->affinity_hint_set = true; | |
823 | } else { | |
0c8482ac FZ |
824 | for (i = 0; i < vscsi->num_queues; i++) { |
825 | if (!vscsi->req_vqs[i].vq) | |
826 | continue; | |
827 | ||
9141a4ca | 828 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, -1); |
0c8482ac | 829 | } |
9141a4ca PB |
830 | |
831 | vscsi->affinity_hint_set = false; | |
832 | } | |
833 | } | |
834 | ||
835 | static void virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) | |
836 | { | |
837 | get_online_cpus(); | |
838 | __virtscsi_set_affinity(vscsi, affinity); | |
839 | put_online_cpus(); | |
840 | } | |
841 | ||
285e71ea WG |
842 | static int virtscsi_cpu_callback(struct notifier_block *nfb, |
843 | unsigned long action, void *hcpu) | |
844 | { | |
845 | struct virtio_scsi *vscsi = container_of(nfb, struct virtio_scsi, nb); | |
846 | switch(action) { | |
847 | case CPU_ONLINE: | |
848 | case CPU_ONLINE_FROZEN: | |
849 | case CPU_DEAD: | |
850 | case CPU_DEAD_FROZEN: | |
851 | __virtscsi_set_affinity(vscsi, true); | |
852 | break; | |
853 | default: | |
854 | break; | |
855 | } | |
856 | return NOTIFY_OK; | |
857 | } | |
858 | ||
139fe45a PB |
859 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
860 | struct virtqueue *vq) | |
861 | { | |
862 | spin_lock_init(&virtscsi_vq->vq_lock); | |
863 | virtscsi_vq->vq = vq; | |
864 | } | |
865 | ||
2bd37f0f PB |
866 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
867 | { | |
9141a4ca PB |
868 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
869 | struct virtio_scsi *vscsi = shost_priv(sh); | |
870 | ||
871 | virtscsi_set_affinity(vscsi, false); | |
872 | ||
2bd37f0f PB |
873 | /* Stop all the virtqueues. */ |
874 | vdev->config->reset(vdev); | |
875 | ||
2bd37f0f PB |
876 | vdev->config->del_vqs(vdev); |
877 | } | |
878 | ||
4fe74b1c | 879 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 880 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
881 | { |
882 | int err; | |
9141a4ca PB |
883 | u32 i; |
884 | u32 num_vqs; | |
885 | vq_callback_t **callbacks; | |
886 | const char **names; | |
887 | struct virtqueue **vqs; | |
888 | ||
889 | num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE; | |
890 | vqs = kmalloc(num_vqs * sizeof(struct virtqueue *), GFP_KERNEL); | |
891 | callbacks = kmalloc(num_vqs * sizeof(vq_callback_t *), GFP_KERNEL); | |
892 | names = kmalloc(num_vqs * sizeof(char *), GFP_KERNEL); | |
893 | ||
894 | if (!callbacks || !vqs || !names) { | |
895 | err = -ENOMEM; | |
896 | goto out; | |
897 | } | |
2bd37f0f | 898 | |
9141a4ca PB |
899 | callbacks[0] = virtscsi_ctrl_done; |
900 | callbacks[1] = virtscsi_event_done; | |
901 | names[0] = "control"; | |
902 | names[1] = "event"; | |
903 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) { | |
904 | callbacks[i] = virtscsi_req_done; | |
905 | names[i] = "request"; | |
906 | } | |
4fe74b1c PB |
907 | |
908 | /* Discover virtqueues and write information to configuration. */ | |
9141a4ca | 909 | err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names); |
4fe74b1c | 910 | if (err) |
9141a4ca | 911 | goto out; |
4fe74b1c | 912 | |
139fe45a PB |
913 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
914 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
915 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
916 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
917 | vqs[i]); | |
918 | ||
919 | virtscsi_set_affinity(vscsi, true); | |
4fe74b1c PB |
920 | |
921 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); | |
922 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 923 | |
9141a4ca PB |
924 | err = 0; |
925 | ||
926 | out: | |
927 | kfree(names); | |
928 | kfree(callbacks); | |
929 | kfree(vqs); | |
930 | if (err) | |
931 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 932 | return err; |
4fe74b1c PB |
933 | } |
934 | ||
6f039790 | 935 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
936 | { |
937 | struct Scsi_Host *shost; | |
938 | struct virtio_scsi *vscsi; | |
e6dc783a | 939 | int err, host_prot; |
2bd37f0f | 940 | u32 sg_elems, num_targets; |
4fe74b1c | 941 | u32 cmd_per_lun; |
9141a4ca PB |
942 | u32 num_queues; |
943 | struct scsi_host_template *hostt; | |
944 | ||
945 | /* We need to know how many queues before we allocate. */ | |
946 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
4fe74b1c | 947 | |
2bd37f0f | 948 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 949 | |
9141a4ca PB |
950 | if (num_queues == 1) |
951 | hostt = &virtscsi_host_template_single; | |
952 | else | |
953 | hostt = &virtscsi_host_template_multi; | |
954 | ||
955 | shost = scsi_host_alloc(hostt, | |
956 | sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues); | |
4fe74b1c PB |
957 | if (!shost) |
958 | return -ENOMEM; | |
959 | ||
2bd37f0f | 960 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
961 | shost->sg_tablesize = sg_elems; |
962 | vscsi = shost_priv(shost); | |
963 | vscsi->vdev = vdev; | |
9141a4ca | 964 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
965 | vdev->priv = shost; |
966 | ||
5c370194 | 967 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
968 | if (err) |
969 | goto virtscsi_init_failed; | |
970 | ||
285e71ea WG |
971 | vscsi->nb.notifier_call = &virtscsi_cpu_callback; |
972 | err = register_hotcpu_notifier(&vscsi->nb); | |
973 | if (err) { | |
974 | pr_err("registering cpu notifier failed\n"); | |
975 | goto scsi_add_host_failed; | |
976 | } | |
977 | ||
4fe74b1c PB |
978 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
979 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
980 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
981 | |
982 | /* LUNs > 256 are reported with format 1, so they go in the range | |
983 | * 16640-32767. | |
984 | */ | |
985 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 986 | shost->max_id = num_targets; |
4fe74b1c PB |
987 | shost->max_channel = 0; |
988 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
ccbedf11 | 989 | shost->nr_hw_queues = num_queues; |
e6dc783a NB |
990 | |
991 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) { | |
992 | host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | | |
993 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | | |
994 | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; | |
995 | ||
996 | scsi_host_set_prot(shost, host_prot); | |
997 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
998 | } | |
999 | ||
4fe74b1c PB |
1000 | err = scsi_add_host(shost, &vdev->dev); |
1001 | if (err) | |
1002 | goto scsi_add_host_failed; | |
5d8f16d0 MT |
1003 | |
1004 | virtio_device_ready(vdev); | |
1005 | ||
1006 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
1007 | virtscsi_kick_event_all(vscsi); | |
1008 | ||
1009 | scsi_scan_host(shost); | |
4fe74b1c PB |
1010 | return 0; |
1011 | ||
1012 | scsi_add_host_failed: | |
1013 | vdev->config->del_vqs(vdev); | |
1014 | virtscsi_init_failed: | |
1015 | scsi_host_put(shost); | |
1016 | return err; | |
1017 | } | |
1018 | ||
6f039790 | 1019 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
1020 | { |
1021 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
1022 | struct virtio_scsi *vscsi = shost_priv(shost); |
1023 | ||
1024 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
1025 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
1026 | |
1027 | scsi_remove_host(shost); | |
1028 | ||
285e71ea WG |
1029 | unregister_hotcpu_notifier(&vscsi->nb); |
1030 | ||
4fe74b1c PB |
1031 | virtscsi_remove_vqs(vdev); |
1032 | scsi_host_put(shost); | |
1033 | } | |
1034 | ||
89107000 | 1035 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1036 | static int virtscsi_freeze(struct virtio_device *vdev) |
1037 | { | |
f466f753 AH |
1038 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
1039 | struct virtio_scsi *vscsi = shost_priv(sh); | |
1040 | ||
1041 | unregister_hotcpu_notifier(&vscsi->nb); | |
4fe74b1c PB |
1042 | virtscsi_remove_vqs(vdev); |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | static int virtscsi_restore(struct virtio_device *vdev) | |
1047 | { | |
1048 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
1049 | struct virtio_scsi *vscsi = shost_priv(sh); | |
f466f753 AH |
1050 | int err; |
1051 | ||
1052 | err = virtscsi_init(vdev, vscsi); | |
1053 | if (err) | |
1054 | return err; | |
1055 | ||
1056 | err = register_hotcpu_notifier(&vscsi->nb); | |
cd679048 | 1057 | if (err) { |
f466f753 | 1058 | vdev->config->del_vqs(vdev); |
cd679048 MT |
1059 | return err; |
1060 | } | |
1061 | ||
52c9cf1a MT |
1062 | virtio_device_ready(vdev); |
1063 | ||
cd679048 MT |
1064 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
1065 | virtscsi_kick_event_all(vscsi); | |
4fe74b1c | 1066 | |
f466f753 | 1067 | return err; |
4fe74b1c PB |
1068 | } |
1069 | #endif | |
1070 | ||
1071 | static struct virtio_device_id id_table[] = { | |
1072 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
1073 | { 0 }, | |
1074 | }; | |
1075 | ||
365a7150 | 1076 | static unsigned int features[] = { |
865b58c0 PB |
1077 | VIRTIO_SCSI_F_HOTPLUG, |
1078 | VIRTIO_SCSI_F_CHANGE, | |
e6dc783a | 1079 | VIRTIO_SCSI_F_T10_PI, |
365a7150 CM |
1080 | }; |
1081 | ||
4fe74b1c | 1082 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
1083 | .feature_table = features, |
1084 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
1085 | .driver.name = KBUILD_MODNAME, |
1086 | .driver.owner = THIS_MODULE, | |
1087 | .id_table = id_table, | |
1088 | .probe = virtscsi_probe, | |
89107000 | 1089 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1090 | .freeze = virtscsi_freeze, |
1091 | .restore = virtscsi_restore, | |
1092 | #endif | |
6f039790 | 1093 | .remove = virtscsi_remove, |
4fe74b1c PB |
1094 | }; |
1095 | ||
1096 | static int __init init(void) | |
1097 | { | |
1098 | int ret = -ENOMEM; | |
1099 | ||
1100 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
1101 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 1102 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
1103 | goto error; |
1104 | } | |
1105 | ||
1106 | ||
1107 | virtscsi_cmd_pool = | |
1108 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
1109 | virtscsi_cmd_cache); | |
1110 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 1111 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
1112 | goto error; |
1113 | } | |
1114 | ret = register_virtio_driver(&virtio_scsi_driver); | |
1115 | if (ret < 0) | |
1116 | goto error; | |
1117 | ||
1118 | return 0; | |
1119 | ||
1120 | error: | |
1121 | if (virtscsi_cmd_pool) { | |
1122 | mempool_destroy(virtscsi_cmd_pool); | |
1123 | virtscsi_cmd_pool = NULL; | |
1124 | } | |
1125 | if (virtscsi_cmd_cache) { | |
1126 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1127 | virtscsi_cmd_cache = NULL; | |
1128 | } | |
1129 | return ret; | |
1130 | } | |
1131 | ||
1132 | static void __exit fini(void) | |
1133 | { | |
1134 | unregister_virtio_driver(&virtio_scsi_driver); | |
1135 | mempool_destroy(virtscsi_cmd_pool); | |
1136 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1137 | } | |
1138 | module_init(init); | |
1139 | module_exit(fini); | |
1140 | ||
1141 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1142 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
1143 | MODULE_LICENSE("GPL"); |