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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 | ||
8904f5a5 SAS |
110 | struct hlist_node node; |
111 | struct hlist_node node_dead; | |
285e71ea | 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 | ||
8904f5a5 | 121 | static enum cpuhp_state virtioscsi_online; |
4fe74b1c PB |
122 | static struct kmem_cache *virtscsi_cmd_cache; |
123 | static mempool_t *virtscsi_cmd_pool; | |
124 | ||
125 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
126 | { | |
127 | return vdev->priv; | |
128 | } | |
129 | ||
130 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
131 | { | |
132 | if (!resid) | |
133 | return; | |
134 | ||
135 | if (!scsi_bidi_cmnd(sc)) { | |
136 | scsi_set_resid(sc, resid); | |
137 | return; | |
138 | } | |
139 | ||
140 | scsi_in(sc)->resid = min(resid, scsi_in(sc)->length); | |
141 | scsi_out(sc)->resid = resid - scsi_in(sc)->resid; | |
142 | } | |
143 | ||
144 | /** | |
145 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
146 | * | |
147 | * Called with vq_lock held. | |
148 | */ | |
7f82b3c9 | 149 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
150 | { |
151 | struct virtio_scsi_cmd *cmd = buf; | |
152 | struct scsi_cmnd *sc = cmd->sc; | |
153 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
9141a4ca PB |
154 | struct virtio_scsi_target_state *tgt = |
155 | scsi_target(sc->device)->hostdata; | |
4fe74b1c PB |
156 | |
157 | dev_dbg(&sc->device->sdev_gendev, | |
158 | "cmd %p response %u status %#02x sense_len %u\n", | |
159 | sc, resp->response, resp->status, resp->sense_len); | |
160 | ||
161 | sc->result = resp->status; | |
d75dff39 | 162 | virtscsi_compute_resid(sc, virtio32_to_cpu(vscsi->vdev, resp->resid)); |
4fe74b1c PB |
163 | switch (resp->response) { |
164 | case VIRTIO_SCSI_S_OK: | |
165 | set_host_byte(sc, DID_OK); | |
166 | break; | |
167 | case VIRTIO_SCSI_S_OVERRUN: | |
168 | set_host_byte(sc, DID_ERROR); | |
169 | break; | |
170 | case VIRTIO_SCSI_S_ABORTED: | |
171 | set_host_byte(sc, DID_ABORT); | |
172 | break; | |
173 | case VIRTIO_SCSI_S_BAD_TARGET: | |
174 | set_host_byte(sc, DID_BAD_TARGET); | |
175 | break; | |
176 | case VIRTIO_SCSI_S_RESET: | |
177 | set_host_byte(sc, DID_RESET); | |
178 | break; | |
179 | case VIRTIO_SCSI_S_BUSY: | |
180 | set_host_byte(sc, DID_BUS_BUSY); | |
181 | break; | |
182 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
183 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
184 | break; | |
185 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
186 | set_host_byte(sc, DID_TARGET_FAILURE); | |
187 | break; | |
188 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
189 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
190 | break; | |
191 | default: | |
192 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
193 | resp->response); | |
194 | /* fall through */ | |
195 | case VIRTIO_SCSI_S_FAILURE: | |
196 | set_host_byte(sc, DID_ERROR); | |
197 | break; | |
198 | } | |
199 | ||
d75dff39 MT |
200 | WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) > |
201 | VIRTIO_SCSI_SENSE_SIZE); | |
4fe74b1c PB |
202 | if (sc->sense_buffer) { |
203 | memcpy(sc->sense_buffer, resp->sense, | |
d75dff39 MT |
204 | min_t(u32, |
205 | virtio32_to_cpu(vscsi->vdev, resp->sense_len), | |
206 | VIRTIO_SCSI_SENSE_SIZE)); | |
4fe74b1c PB |
207 | if (resp->sense_len) |
208 | set_driver_byte(sc, DRIVER_SENSE); | |
209 | } | |
210 | ||
4fe74b1c | 211 | sc->scsi_done(sc); |
9141a4ca PB |
212 | |
213 | atomic_dec(&tgt->reqs); | |
4fe74b1c PB |
214 | } |
215 | ||
10f34f64 PB |
216 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
217 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 218 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 219 | { |
4fe74b1c | 220 | void *buf; |
4fe74b1c | 221 | unsigned int len; |
10f34f64 PB |
222 | unsigned long flags; |
223 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 224 | |
10f34f64 | 225 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
226 | do { |
227 | virtqueue_disable_cb(vq); | |
228 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 229 | fn(vscsi, buf); |
2bf4fd31 HG |
230 | |
231 | if (unlikely(virtqueue_is_broken(vq))) | |
232 | break; | |
4fe74b1c | 233 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 234 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
235 | } |
236 | ||
237 | static void virtscsi_req_done(struct virtqueue *vq) | |
238 | { | |
139fe45a PB |
239 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
240 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
241 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
242 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
243 | ||
9141a4ca | 244 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); |
4fe74b1c PB |
245 | }; |
246 | ||
8faeb529 PB |
247 | static void virtscsi_poll_requests(struct virtio_scsi *vscsi) |
248 | { | |
249 | int i, num_vqs; | |
250 | ||
251 | num_vqs = vscsi->num_queues; | |
252 | for (i = 0; i < num_vqs; i++) | |
253 | virtscsi_vq_done(vscsi, &vscsi->req_vqs[i], | |
254 | virtscsi_complete_cmd); | |
255 | } | |
256 | ||
7f82b3c9 | 257 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
258 | { |
259 | struct virtio_scsi_cmd *cmd = buf; | |
260 | ||
261 | if (cmd->comp) | |
e8f81420 | 262 | complete(cmd->comp); |
4fe74b1c PB |
263 | } |
264 | ||
265 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
266 | { | |
139fe45a PB |
267 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
268 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 269 | |
10f34f64 | 270 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
271 | }; |
272 | ||
cdda0e5a PB |
273 | static void virtscsi_handle_event(struct work_struct *work); |
274 | ||
365a7150 CM |
275 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
276 | struct virtio_scsi_event_node *event_node) | |
277 | { | |
4614e51c | 278 | int err; |
365a7150 CM |
279 | struct scatterlist sg; |
280 | unsigned long flags; | |
281 | ||
cdda0e5a | 282 | INIT_WORK(&event_node->work, virtscsi_handle_event); |
2e9c9dfd | 283 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
284 | |
285 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
286 | ||
bf958291 RR |
287 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
288 | GFP_ATOMIC); | |
4614e51c | 289 | if (!err) |
365a7150 CM |
290 | virtqueue_kick(vscsi->event_vq.vq); |
291 | ||
292 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
293 | ||
4614e51c | 294 | return err; |
365a7150 CM |
295 | } |
296 | ||
297 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
298 | { | |
299 | int i; | |
300 | ||
301 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
302 | vscsi->event_list[i].vscsi = vscsi; | |
303 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
304 | } | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
310 | { | |
311 | int i; | |
312 | ||
e67423c7 MT |
313 | /* Stop scheduling work before calling cancel_work_sync. */ |
314 | spin_lock_irq(&vscsi->event_vq.vq_lock); | |
315 | vscsi->stop_events = true; | |
316 | spin_unlock_irq(&vscsi->event_vq.vq_lock); | |
317 | ||
365a7150 CM |
318 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) |
319 | cancel_work_sync(&vscsi->event_list[i].work); | |
320 | } | |
321 | ||
322 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 323 | struct virtio_scsi_event *event) |
365a7150 CM |
324 | { |
325 | struct scsi_device *sdev; | |
326 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
327 | unsigned int target = event->lun[1]; | |
328 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
329 | ||
d75dff39 | 330 | switch (virtio32_to_cpu(vscsi->vdev, event->reason)) { |
365a7150 CM |
331 | case VIRTIO_SCSI_EVT_RESET_RESCAN: |
332 | scsi_add_device(shost, 0, target, lun); | |
333 | break; | |
334 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
335 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
336 | if (sdev) { | |
337 | scsi_remove_device(sdev); | |
338 | scsi_device_put(sdev); | |
339 | } else { | |
340 | pr_err("SCSI device %d 0 %d %d not found\n", | |
341 | shost->host_no, target, lun); | |
342 | } | |
343 | break; | |
344 | default: | |
345 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
346 | } | |
347 | } | |
348 | ||
865b58c0 PB |
349 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
350 | struct virtio_scsi_event *event) | |
351 | { | |
352 | struct scsi_device *sdev; | |
353 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
354 | unsigned int target = event->lun[1]; | |
355 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
d75dff39 MT |
356 | u8 asc = virtio32_to_cpu(vscsi->vdev, event->reason) & 255; |
357 | u8 ascq = virtio32_to_cpu(vscsi->vdev, event->reason) >> 8; | |
865b58c0 PB |
358 | |
359 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
360 | if (!sdev) { | |
361 | pr_err("SCSI device %d 0 %d %d not found\n", | |
362 | shost->host_no, target, lun); | |
363 | return; | |
364 | } | |
365 | ||
366 | /* Handle "Parameters changed", "Mode parameters changed", and | |
367 | "Capacity data has changed". */ | |
368 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
369 | scsi_rescan_device(&sdev->sdev_gendev); | |
370 | ||
371 | scsi_device_put(sdev); | |
372 | } | |
373 | ||
365a7150 CM |
374 | static void virtscsi_handle_event(struct work_struct *work) |
375 | { | |
376 | struct virtio_scsi_event_node *event_node = | |
377 | container_of(work, struct virtio_scsi_event_node, work); | |
378 | struct virtio_scsi *vscsi = event_node->vscsi; | |
379 | struct virtio_scsi_event *event = &event_node->event; | |
380 | ||
d75dff39 MT |
381 | if (event->event & |
382 | cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) { | |
383 | event->event &= ~cpu_to_virtio32(vscsi->vdev, | |
384 | VIRTIO_SCSI_T_EVENTS_MISSED); | |
365a7150 CM |
385 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); |
386 | } | |
387 | ||
d75dff39 | 388 | switch (virtio32_to_cpu(vscsi->vdev, event->event)) { |
365a7150 CM |
389 | case VIRTIO_SCSI_T_NO_EVENT: |
390 | break; | |
391 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
392 | virtscsi_handle_transport_reset(vscsi, event); | |
393 | break; | |
865b58c0 PB |
394 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
395 | virtscsi_handle_param_change(vscsi, event); | |
396 | break; | |
365a7150 CM |
397 | default: |
398 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
399 | } | |
400 | virtscsi_kick_event(vscsi, event_node); | |
401 | } | |
402 | ||
7f82b3c9 | 403 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
404 | { |
405 | struct virtio_scsi_event_node *event_node = buf; | |
406 | ||
e67423c7 MT |
407 | if (!vscsi->stop_events) |
408 | queue_work(system_freezable_wq, &event_node->work); | |
365a7150 CM |
409 | } |
410 | ||
4fe74b1c PB |
411 | static void virtscsi_event_done(struct virtqueue *vq) |
412 | { | |
139fe45a PB |
413 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
414 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 415 | |
10f34f64 | 416 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
417 | }; |
418 | ||
4fe74b1c | 419 | /** |
682993b4 WG |
420 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue |
421 | * @vq : the struct virtqueue we're talking about | |
4fe74b1c | 422 | * @cmd : command structure |
4fe74b1c PB |
423 | * @req_size : size of the request buffer |
424 | * @resp_size : size of the response buffer | |
4fe74b1c | 425 | */ |
682993b4 WG |
426 | static int virtscsi_add_cmd(struct virtqueue *vq, |
427 | struct virtio_scsi_cmd *cmd, | |
c77fba9a | 428 | size_t req_size, size_t resp_size) |
4fe74b1c PB |
429 | { |
430 | struct scsi_cmnd *sc = cmd->sc; | |
e6dc783a | 431 | struct scatterlist *sgs[6], req, resp; |
682993b4 WG |
432 | struct sg_table *out, *in; |
433 | unsigned out_num = 0, in_num = 0; | |
434 | ||
435 | out = in = NULL; | |
436 | ||
437 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
438 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
439 | out = &scsi_out(sc)->table; | |
440 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
441 | in = &scsi_in(sc)->table; | |
442 | } | |
4fe74b1c | 443 | |
4fe74b1c | 444 | /* Request header. */ |
682993b4 WG |
445 | sg_init_one(&req, &cmd->req, req_size); |
446 | sgs[out_num++] = &req; | |
4fe74b1c PB |
447 | |
448 | /* Data-out buffer. */ | |
e6dc783a NB |
449 | if (out) { |
450 | /* Place WRITE protection SGLs before Data OUT payload */ | |
451 | if (scsi_prot_sg_count(sc)) | |
452 | sgs[out_num++] = scsi_prot_sglist(sc); | |
682993b4 | 453 | sgs[out_num++] = out->sgl; |
e6dc783a | 454 | } |
4fe74b1c PB |
455 | |
456 | /* Response header. */ | |
682993b4 WG |
457 | sg_init_one(&resp, &cmd->resp, resp_size); |
458 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
459 | |
460 | /* Data-in buffer */ | |
e6dc783a NB |
461 | if (in) { |
462 | /* Place READ protection SGLs before Data IN payload */ | |
463 | if (scsi_prot_sg_count(sc)) | |
464 | sgs[out_num + in_num++] = scsi_prot_sglist(sc); | |
682993b4 | 465 | sgs[out_num + in_num++] = in->sgl; |
e6dc783a | 466 | } |
4fe74b1c | 467 | |
c77fba9a | 468 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC); |
4fe74b1c PB |
469 | } |
470 | ||
682993b4 | 471 | static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, |
4fe74b1c | 472 | struct virtio_scsi_cmd *cmd, |
c77fba9a | 473 | size_t req_size, size_t resp_size) |
4fe74b1c | 474 | { |
4fe74b1c | 475 | unsigned long flags; |
4614e51c RR |
476 | int err; |
477 | bool needs_kick = false; | |
4fe74b1c | 478 | |
682993b4 | 479 | spin_lock_irqsave(&vq->vq_lock, flags); |
c77fba9a | 480 | err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size); |
4614e51c RR |
481 | if (!err) |
482 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 483 | |
bce750b1 | 484 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 485 | |
4614e51c | 486 | if (needs_kick) |
139fe45a | 487 | virtqueue_notify(vq->vq); |
4614e51c | 488 | return err; |
4fe74b1c PB |
489 | } |
490 | ||
d75dff39 MT |
491 | static void virtio_scsi_init_hdr(struct virtio_device *vdev, |
492 | struct virtio_scsi_cmd_req *cmd, | |
e6dc783a NB |
493 | struct scsi_cmnd *sc) |
494 | { | |
495 | cmd->lun[0] = 1; | |
496 | cmd->lun[1] = sc->device->id; | |
497 | cmd->lun[2] = (sc->device->lun >> 8) | 0x40; | |
498 | cmd->lun[3] = sc->device->lun & 0xff; | |
d75dff39 | 499 | cmd->tag = cpu_to_virtio64(vdev, (unsigned long)sc); |
e6dc783a NB |
500 | cmd->task_attr = VIRTIO_SCSI_S_SIMPLE; |
501 | cmd->prio = 0; | |
502 | cmd->crn = 0; | |
503 | } | |
504 | ||
c5c2567f | 505 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
d75dff39 MT |
506 | static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev, |
507 | struct virtio_scsi_cmd_req_pi *cmd_pi, | |
e6dc783a NB |
508 | struct scsi_cmnd *sc) |
509 | { | |
510 | struct request *rq = sc->request; | |
511 | struct blk_integrity *bi; | |
512 | ||
d75dff39 | 513 | virtio_scsi_init_hdr(vdev, (struct virtio_scsi_cmd_req *)cmd_pi, sc); |
e6dc783a NB |
514 | |
515 | if (!rq || !scsi_prot_sg_count(sc)) | |
516 | return; | |
517 | ||
518 | bi = blk_get_integrity(rq->rq_disk); | |
519 | ||
520 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
d75dff39 MT |
521 | cmd_pi->pi_bytesout = cpu_to_virtio32(vdev, |
522 | blk_rq_sectors(rq) * | |
523 | bi->tuple_size); | |
e6dc783a | 524 | else if (sc->sc_data_direction == DMA_FROM_DEVICE) |
d75dff39 MT |
525 | cmd_pi->pi_bytesin = cpu_to_virtio32(vdev, |
526 | blk_rq_sectors(rq) * | |
527 | bi->tuple_size); | |
e6dc783a | 528 | } |
c5c2567f | 529 | #endif |
e6dc783a | 530 | |
9141a4ca PB |
531 | static int virtscsi_queuecommand(struct virtio_scsi *vscsi, |
532 | struct virtio_scsi_vq *req_vq, | |
533 | struct scsi_cmnd *sc) | |
4fe74b1c | 534 | { |
2bd37f0f | 535 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
b54197c4 | 536 | struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc); |
773c7220 | 537 | unsigned long flags; |
ed9ea4ed | 538 | int req_size; |
773c7220 | 539 | int ret; |
b54197c4 | 540 | |
2bd37f0f PB |
541 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
542 | ||
543 | /* TODO: check feature bit and fail if unsupported? */ | |
544 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
545 | ||
4fe74b1c PB |
546 | dev_dbg(&sc->device->sdev_gendev, |
547 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
548 | ||
4fe74b1c PB |
549 | memset(cmd, 0, sizeof(*cmd)); |
550 | cmd->sc = sc; | |
4fe74b1c PB |
551 | |
552 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
4fe74b1c | 553 | |
c5c2567f | 554 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 555 | if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) { |
d75dff39 | 556 | virtio_scsi_init_hdr_pi(vscsi->vdev, &cmd->req.cmd_pi, sc); |
e6dc783a NB |
557 | memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len); |
558 | req_size = sizeof(cmd->req.cmd_pi); | |
c5c2567f CH |
559 | } else |
560 | #endif | |
561 | { | |
d75dff39 | 562 | virtio_scsi_init_hdr(vscsi->vdev, &cmd->req.cmd, sc); |
e6dc783a NB |
563 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); |
564 | req_size = sizeof(cmd->req.cmd); | |
565 | } | |
566 | ||
773c7220 EF |
567 | ret = virtscsi_kick_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd)); |
568 | if (ret == -EIO) { | |
569 | cmd->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; | |
570 | spin_lock_irqsave(&req_vq->vq_lock, flags); | |
571 | virtscsi_complete_cmd(vscsi, cmd); | |
572 | spin_unlock_irqrestore(&req_vq->vq_lock, flags); | |
573 | } else if (ret != 0) { | |
b54197c4 | 574 | return SCSI_MLQUEUE_HOST_BUSY; |
773c7220 | 575 | } |
b54197c4 | 576 | return 0; |
4fe74b1c PB |
577 | } |
578 | ||
9141a4ca PB |
579 | static int virtscsi_queuecommand_single(struct Scsi_Host *sh, |
580 | struct scsi_cmnd *sc) | |
581 | { | |
582 | struct virtio_scsi *vscsi = shost_priv(sh); | |
583 | struct virtio_scsi_target_state *tgt = | |
584 | scsi_target(sc->device)->hostdata; | |
585 | ||
586 | atomic_inc(&tgt->reqs); | |
587 | return virtscsi_queuecommand(vscsi, &vscsi->req_vqs[0], sc); | |
588 | } | |
589 | ||
ccbedf11 ML |
590 | static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi, |
591 | struct scsi_cmnd *sc) | |
592 | { | |
593 | u32 tag = blk_mq_unique_tag(sc->request); | |
594 | u16 hwq = blk_mq_unique_tag_to_hwq(tag); | |
595 | ||
596 | return &vscsi->req_vqs[hwq]; | |
597 | } | |
598 | ||
9141a4ca PB |
599 | static struct virtio_scsi_vq *virtscsi_pick_vq(struct virtio_scsi *vscsi, |
600 | struct virtio_scsi_target_state *tgt) | |
601 | { | |
602 | struct virtio_scsi_vq *vq; | |
603 | unsigned long flags; | |
604 | u32 queue_num; | |
605 | ||
938ece71 ML |
606 | local_irq_save(flags); |
607 | if (atomic_inc_return(&tgt->reqs) > 1) { | |
608 | unsigned long seq; | |
609 | ||
610 | do { | |
611 | seq = read_seqcount_begin(&tgt->tgt_seq); | |
612 | vq = tgt->req_vq; | |
613 | } while (read_seqcount_retry(&tgt->tgt_seq, seq)); | |
614 | } else { | |
615 | /* no writes can be concurrent because of atomic_t */ | |
616 | write_seqcount_begin(&tgt->tgt_seq); | |
617 | ||
618 | /* keep previous req_vq if a reader just arrived */ | |
619 | if (unlikely(atomic_read(&tgt->reqs) > 1)) { | |
620 | vq = tgt->req_vq; | |
621 | goto unlock; | |
622 | } | |
9141a4ca | 623 | |
9141a4ca PB |
624 | queue_num = smp_processor_id(); |
625 | while (unlikely(queue_num >= vscsi->num_queues)) | |
626 | queue_num -= vscsi->num_queues; | |
9141a4ca | 627 | tgt->req_vq = vq = &vscsi->req_vqs[queue_num]; |
938ece71 ML |
628 | unlock: |
629 | write_seqcount_end(&tgt->tgt_seq); | |
9141a4ca | 630 | } |
938ece71 | 631 | local_irq_restore(flags); |
9141a4ca | 632 | |
9141a4ca PB |
633 | return vq; |
634 | } | |
635 | ||
636 | static int virtscsi_queuecommand_multi(struct Scsi_Host *sh, | |
637 | struct scsi_cmnd *sc) | |
638 | { | |
639 | struct virtio_scsi *vscsi = shost_priv(sh); | |
640 | struct virtio_scsi_target_state *tgt = | |
641 | scsi_target(sc->device)->hostdata; | |
ccbedf11 ML |
642 | struct virtio_scsi_vq *req_vq; |
643 | ||
644 | if (shost_use_blk_mq(sh)) | |
645 | req_vq = virtscsi_pick_vq_mq(vscsi, sc); | |
646 | else | |
647 | req_vq = virtscsi_pick_vq(vscsi, tgt); | |
9141a4ca PB |
648 | |
649 | return virtscsi_queuecommand(vscsi, req_vq, sc); | |
650 | } | |
651 | ||
4fe74b1c PB |
652 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) |
653 | { | |
654 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 655 | int ret = FAILED; |
4fe74b1c PB |
656 | |
657 | cmd->comp = ∁ | |
682993b4 | 658 | if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd, |
c77fba9a | 659 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf) < 0) |
e4594bb5 | 660 | goto out; |
4fe74b1c PB |
661 | |
662 | wait_for_completion(&comp); | |
e4594bb5 PB |
663 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
664 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
665 | ret = SUCCESS; | |
4fe74b1c | 666 | |
8faeb529 PB |
667 | /* |
668 | * The spec guarantees that all requests related to the TMF have | |
669 | * been completed, but the callback might not have run yet if | |
670 | * we're using independent interrupts (e.g. MSI). Poll the | |
671 | * virtqueues once. | |
672 | * | |
673 | * In the abort case, sc->scsi_done will do nothing, because | |
674 | * the block layer must have detected a timeout and as a result | |
675 | * REQ_ATOM_COMPLETE has been set. | |
676 | */ | |
677 | virtscsi_poll_requests(vscsi); | |
678 | ||
e4594bb5 PB |
679 | out: |
680 | mempool_free(cmd, virtscsi_cmd_pool); | |
681 | return ret; | |
4fe74b1c PB |
682 | } |
683 | ||
684 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
685 | { | |
686 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
687 | struct virtio_scsi_cmd *cmd; | |
688 | ||
689 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
690 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
691 | if (!cmd) | |
692 | return FAILED; | |
693 | ||
694 | memset(cmd, 0, sizeof(*cmd)); | |
695 | cmd->sc = sc; | |
696 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
697 | .type = VIRTIO_SCSI_T_TMF, | |
d75dff39 MT |
698 | .subtype = cpu_to_virtio32(vscsi->vdev, |
699 | VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET), | |
4fe74b1c PB |
700 | .lun[0] = 1, |
701 | .lun[1] = sc->device->id, | |
702 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
703 | .lun[3] = sc->device->lun & 0xff, | |
704 | }; | |
705 | return virtscsi_tmf(vscsi, cmd); | |
706 | } | |
707 | ||
761f1193 VS |
708 | /** |
709 | * virtscsi_change_queue_depth() - Change a virtscsi target's queue depth | |
710 | * @sdev: Virtscsi target whose queue depth to change | |
711 | * @qdepth: New queue depth | |
761f1193 | 712 | */ |
db5ed4df | 713 | static int virtscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
761f1193 VS |
714 | { |
715 | struct Scsi_Host *shost = sdev->host; | |
716 | int max_depth = shost->cmd_per_lun; | |
717 | ||
db5ed4df | 718 | return scsi_change_queue_depth(sdev, min(max_depth, qdepth)); |
761f1193 VS |
719 | } |
720 | ||
4fe74b1c PB |
721 | static int virtscsi_abort(struct scsi_cmnd *sc) |
722 | { | |
723 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
724 | struct virtio_scsi_cmd *cmd; | |
725 | ||
726 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
727 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
728 | if (!cmd) | |
729 | return FAILED; | |
730 | ||
731 | memset(cmd, 0, sizeof(*cmd)); | |
732 | cmd->sc = sc; | |
733 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
734 | .type = VIRTIO_SCSI_T_TMF, | |
735 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
736 | .lun[0] = 1, | |
737 | .lun[1] = sc->device->id, | |
738 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
739 | .lun[3] = sc->device->lun & 0xff, | |
d75dff39 | 740 | .tag = cpu_to_virtio64(vscsi->vdev, (unsigned long)sc), |
4fe74b1c PB |
741 | }; |
742 | return virtscsi_tmf(vscsi, cmd); | |
743 | } | |
744 | ||
5c370194 WG |
745 | static int virtscsi_target_alloc(struct scsi_target *starget) |
746 | { | |
938ece71 ML |
747 | struct Scsi_Host *sh = dev_to_shost(starget->dev.parent); |
748 | struct virtio_scsi *vscsi = shost_priv(sh); | |
749 | ||
5c370194 WG |
750 | struct virtio_scsi_target_state *tgt = |
751 | kmalloc(sizeof(*tgt), GFP_KERNEL); | |
752 | if (!tgt) | |
753 | return -ENOMEM; | |
754 | ||
938ece71 | 755 | seqcount_init(&tgt->tgt_seq); |
9141a4ca | 756 | atomic_set(&tgt->reqs, 0); |
938ece71 | 757 | tgt->req_vq = &vscsi->req_vqs[0]; |
5c370194 WG |
758 | |
759 | starget->hostdata = tgt; | |
760 | return 0; | |
761 | } | |
762 | ||
763 | static void virtscsi_target_destroy(struct scsi_target *starget) | |
764 | { | |
765 | struct virtio_scsi_target_state *tgt = starget->hostdata; | |
766 | kfree(tgt); | |
767 | } | |
768 | ||
9141a4ca PB |
769 | static struct scsi_host_template virtscsi_host_template_single = { |
770 | .module = THIS_MODULE, | |
771 | .name = "Virtio SCSI HBA", | |
772 | .proc_name = "virtio_scsi", | |
773 | .this_id = -1, | |
b54197c4 | 774 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca | 775 | .queuecommand = virtscsi_queuecommand_single, |
761f1193 | 776 | .change_queue_depth = virtscsi_change_queue_depth, |
9141a4ca PB |
777 | .eh_abort_handler = virtscsi_abort, |
778 | .eh_device_reset_handler = virtscsi_device_reset, | |
779 | ||
780 | .can_queue = 1024, | |
781 | .dma_boundary = UINT_MAX, | |
782 | .use_clustering = ENABLE_CLUSTERING, | |
783 | .target_alloc = virtscsi_target_alloc, | |
784 | .target_destroy = virtscsi_target_destroy, | |
c40ecc12 | 785 | .track_queue_depth = 1, |
9141a4ca PB |
786 | }; |
787 | ||
788 | static struct scsi_host_template virtscsi_host_template_multi = { | |
4fe74b1c PB |
789 | .module = THIS_MODULE, |
790 | .name = "Virtio SCSI HBA", | |
791 | .proc_name = "virtio_scsi", | |
4fe74b1c | 792 | .this_id = -1, |
b54197c4 | 793 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca | 794 | .queuecommand = virtscsi_queuecommand_multi, |
761f1193 | 795 | .change_queue_depth = virtscsi_change_queue_depth, |
4fe74b1c PB |
796 | .eh_abort_handler = virtscsi_abort, |
797 | .eh_device_reset_handler = virtscsi_device_reset, | |
798 | ||
799 | .can_queue = 1024, | |
800 | .dma_boundary = UINT_MAX, | |
801 | .use_clustering = ENABLE_CLUSTERING, | |
5c370194 WG |
802 | .target_alloc = virtscsi_target_alloc, |
803 | .target_destroy = virtscsi_target_destroy, | |
c40ecc12 | 804 | .track_queue_depth = 1, |
4fe74b1c PB |
805 | }; |
806 | ||
807 | #define virtscsi_config_get(vdev, fld) \ | |
808 | ({ \ | |
809 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
855e0c52 | 810 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
811 | __val; \ |
812 | }) | |
813 | ||
814 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 815 | do { \ |
4fe74b1c | 816 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ |
855e0c52 RR |
817 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
818 | } while(0) | |
4fe74b1c | 819 | |
9141a4ca PB |
820 | static void __virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) |
821 | { | |
822 | int i; | |
823 | int cpu; | |
824 | ||
825 | /* In multiqueue mode, when the number of cpu is equal | |
826 | * to the number of request queues, we let the qeueues | |
827 | * to be private to one cpu by setting the affinity hint | |
828 | * to eliminate the contention. | |
829 | */ | |
830 | if ((vscsi->num_queues == 1 || | |
831 | vscsi->num_queues != num_online_cpus()) && affinity) { | |
832 | if (vscsi->affinity_hint_set) | |
833 | affinity = false; | |
834 | else | |
835 | return; | |
836 | } | |
837 | ||
838 | if (affinity) { | |
839 | i = 0; | |
840 | for_each_online_cpu(cpu) { | |
841 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, cpu); | |
842 | i++; | |
843 | } | |
844 | ||
845 | vscsi->affinity_hint_set = true; | |
846 | } else { | |
0c8482ac FZ |
847 | for (i = 0; i < vscsi->num_queues; i++) { |
848 | if (!vscsi->req_vqs[i].vq) | |
849 | continue; | |
850 | ||
9141a4ca | 851 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, -1); |
0c8482ac | 852 | } |
9141a4ca PB |
853 | |
854 | vscsi->affinity_hint_set = false; | |
855 | } | |
856 | } | |
857 | ||
858 | static void virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) | |
859 | { | |
860 | get_online_cpus(); | |
861 | __virtscsi_set_affinity(vscsi, affinity); | |
862 | put_online_cpus(); | |
863 | } | |
864 | ||
8904f5a5 | 865 | static int virtscsi_cpu_online(unsigned int cpu, struct hlist_node *node) |
285e71ea | 866 | { |
8904f5a5 SAS |
867 | struct virtio_scsi *vscsi = hlist_entry_safe(node, struct virtio_scsi, |
868 | node); | |
869 | __virtscsi_set_affinity(vscsi, true); | |
870 | return 0; | |
871 | } | |
872 | ||
873 | static int virtscsi_cpu_notif_add(struct virtio_scsi *vi) | |
874 | { | |
875 | int ret; | |
876 | ||
877 | ret = cpuhp_state_add_instance(virtioscsi_online, &vi->node); | |
878 | if (ret) | |
879 | return ret; | |
880 | ||
881 | ret = cpuhp_state_add_instance(CPUHP_VIRT_SCSI_DEAD, &vi->node_dead); | |
882 | if (ret) | |
883 | cpuhp_state_remove_instance(virtioscsi_online, &vi->node); | |
884 | return ret; | |
885 | } | |
886 | ||
887 | static void virtscsi_cpu_notif_remove(struct virtio_scsi *vi) | |
888 | { | |
889 | cpuhp_state_remove_instance_nocalls(virtioscsi_online, &vi->node); | |
890 | cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_SCSI_DEAD, | |
891 | &vi->node_dead); | |
285e71ea WG |
892 | } |
893 | ||
139fe45a PB |
894 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
895 | struct virtqueue *vq) | |
896 | { | |
897 | spin_lock_init(&virtscsi_vq->vq_lock); | |
898 | virtscsi_vq->vq = vq; | |
899 | } | |
900 | ||
2bd37f0f PB |
901 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
902 | { | |
9141a4ca PB |
903 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
904 | struct virtio_scsi *vscsi = shost_priv(sh); | |
905 | ||
906 | virtscsi_set_affinity(vscsi, false); | |
907 | ||
2bd37f0f PB |
908 | /* Stop all the virtqueues. */ |
909 | vdev->config->reset(vdev); | |
910 | ||
2bd37f0f PB |
911 | vdev->config->del_vqs(vdev); |
912 | } | |
913 | ||
4fe74b1c | 914 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 915 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
916 | { |
917 | int err; | |
9141a4ca PB |
918 | u32 i; |
919 | u32 num_vqs; | |
920 | vq_callback_t **callbacks; | |
921 | const char **names; | |
922 | struct virtqueue **vqs; | |
923 | ||
924 | num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE; | |
925 | vqs = kmalloc(num_vqs * sizeof(struct virtqueue *), GFP_KERNEL); | |
926 | callbacks = kmalloc(num_vqs * sizeof(vq_callback_t *), GFP_KERNEL); | |
927 | names = kmalloc(num_vqs * sizeof(char *), GFP_KERNEL); | |
928 | ||
929 | if (!callbacks || !vqs || !names) { | |
930 | err = -ENOMEM; | |
931 | goto out; | |
932 | } | |
2bd37f0f | 933 | |
9141a4ca PB |
934 | callbacks[0] = virtscsi_ctrl_done; |
935 | callbacks[1] = virtscsi_event_done; | |
936 | names[0] = "control"; | |
937 | names[1] = "event"; | |
938 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) { | |
939 | callbacks[i] = virtscsi_req_done; | |
940 | names[i] = "request"; | |
941 | } | |
4fe74b1c PB |
942 | |
943 | /* Discover virtqueues and write information to configuration. */ | |
9141a4ca | 944 | err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names); |
4fe74b1c | 945 | if (err) |
9141a4ca | 946 | goto out; |
4fe74b1c | 947 | |
139fe45a PB |
948 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
949 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
950 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
951 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
952 | vqs[i]); | |
953 | ||
4fe74b1c PB |
954 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); |
955 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 956 | |
9141a4ca PB |
957 | err = 0; |
958 | ||
959 | out: | |
960 | kfree(names); | |
961 | kfree(callbacks); | |
962 | kfree(vqs); | |
963 | if (err) | |
964 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 965 | return err; |
4fe74b1c PB |
966 | } |
967 | ||
6f039790 | 968 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
969 | { |
970 | struct Scsi_Host *shost; | |
971 | struct virtio_scsi *vscsi; | |
908a5544 | 972 | int err; |
2bd37f0f | 973 | u32 sg_elems, num_targets; |
4fe74b1c | 974 | u32 cmd_per_lun; |
9141a4ca PB |
975 | u32 num_queues; |
976 | struct scsi_host_template *hostt; | |
977 | ||
8cab3cd6 MT |
978 | if (!vdev->config->get) { |
979 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
980 | __func__); | |
981 | return -EINVAL; | |
982 | } | |
983 | ||
9141a4ca PB |
984 | /* We need to know how many queues before we allocate. */ |
985 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
4fe74b1c | 986 | |
2bd37f0f | 987 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 988 | |
9141a4ca PB |
989 | if (num_queues == 1) |
990 | hostt = &virtscsi_host_template_single; | |
991 | else | |
992 | hostt = &virtscsi_host_template_multi; | |
993 | ||
994 | shost = scsi_host_alloc(hostt, | |
995 | sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues); | |
4fe74b1c PB |
996 | if (!shost) |
997 | return -ENOMEM; | |
998 | ||
2bd37f0f | 999 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
1000 | shost->sg_tablesize = sg_elems; |
1001 | vscsi = shost_priv(shost); | |
1002 | vscsi->vdev = vdev; | |
9141a4ca | 1003 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
1004 | vdev->priv = shost; |
1005 | ||
5c370194 | 1006 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
1007 | if (err) |
1008 | goto virtscsi_init_failed; | |
1009 | ||
8904f5a5 SAS |
1010 | err = virtscsi_cpu_notif_add(vscsi); |
1011 | if (err) | |
285e71ea | 1012 | goto scsi_add_host_failed; |
285e71ea | 1013 | |
4fe74b1c PB |
1014 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
1015 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
1016 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
1017 | |
1018 | /* LUNs > 256 are reported with format 1, so they go in the range | |
1019 | * 16640-32767. | |
1020 | */ | |
1021 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 1022 | shost->max_id = num_targets; |
4fe74b1c PB |
1023 | shost->max_channel = 0; |
1024 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
ccbedf11 | 1025 | shost->nr_hw_queues = num_queues; |
e6dc783a | 1026 | |
c5c2567f | 1027 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 1028 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) { |
908a5544 SR |
1029 | int host_prot; |
1030 | ||
e6dc783a NB |
1031 | host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | |
1032 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | | |
1033 | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; | |
1034 | ||
1035 | scsi_host_set_prot(shost, host_prot); | |
1036 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
1037 | } | |
c5c2567f | 1038 | #endif |
e6dc783a | 1039 | |
4fe74b1c PB |
1040 | err = scsi_add_host(shost, &vdev->dev); |
1041 | if (err) | |
1042 | goto scsi_add_host_failed; | |
5d8f16d0 MT |
1043 | |
1044 | virtio_device_ready(vdev); | |
1045 | ||
1046 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
1047 | virtscsi_kick_event_all(vscsi); | |
1048 | ||
1049 | scsi_scan_host(shost); | |
4fe74b1c PB |
1050 | return 0; |
1051 | ||
1052 | scsi_add_host_failed: | |
1053 | vdev->config->del_vqs(vdev); | |
1054 | virtscsi_init_failed: | |
1055 | scsi_host_put(shost); | |
1056 | return err; | |
1057 | } | |
1058 | ||
6f039790 | 1059 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
1060 | { |
1061 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
1062 | struct virtio_scsi *vscsi = shost_priv(shost); |
1063 | ||
1064 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
1065 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
1066 | |
1067 | scsi_remove_host(shost); | |
1068 | ||
8904f5a5 | 1069 | virtscsi_cpu_notif_remove(vscsi); |
285e71ea | 1070 | |
4fe74b1c PB |
1071 | virtscsi_remove_vqs(vdev); |
1072 | scsi_host_put(shost); | |
1073 | } | |
1074 | ||
89107000 | 1075 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1076 | static int virtscsi_freeze(struct virtio_device *vdev) |
1077 | { | |
f466f753 AH |
1078 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
1079 | struct virtio_scsi *vscsi = shost_priv(sh); | |
1080 | ||
8904f5a5 | 1081 | virtscsi_cpu_notif_remove(vscsi); |
4fe74b1c PB |
1082 | virtscsi_remove_vqs(vdev); |
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | static int virtscsi_restore(struct virtio_device *vdev) | |
1087 | { | |
1088 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
1089 | struct virtio_scsi *vscsi = shost_priv(sh); | |
f466f753 AH |
1090 | int err; |
1091 | ||
1092 | err = virtscsi_init(vdev, vscsi); | |
1093 | if (err) | |
1094 | return err; | |
1095 | ||
8904f5a5 | 1096 | err = virtscsi_cpu_notif_add(vscsi); |
cd679048 | 1097 | if (err) { |
f466f753 | 1098 | vdev->config->del_vqs(vdev); |
cd679048 MT |
1099 | return err; |
1100 | } | |
52c9cf1a MT |
1101 | virtio_device_ready(vdev); |
1102 | ||
cd679048 MT |
1103 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
1104 | virtscsi_kick_event_all(vscsi); | |
4fe74b1c | 1105 | |
f466f753 | 1106 | return err; |
4fe74b1c PB |
1107 | } |
1108 | #endif | |
1109 | ||
1110 | static struct virtio_device_id id_table[] = { | |
1111 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
1112 | { 0 }, | |
1113 | }; | |
1114 | ||
365a7150 | 1115 | static unsigned int features[] = { |
865b58c0 PB |
1116 | VIRTIO_SCSI_F_HOTPLUG, |
1117 | VIRTIO_SCSI_F_CHANGE, | |
c5c2567f | 1118 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 1119 | VIRTIO_SCSI_F_T10_PI, |
c5c2567f | 1120 | #endif |
365a7150 CM |
1121 | }; |
1122 | ||
4fe74b1c | 1123 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
1124 | .feature_table = features, |
1125 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
1126 | .driver.name = KBUILD_MODNAME, |
1127 | .driver.owner = THIS_MODULE, | |
1128 | .id_table = id_table, | |
1129 | .probe = virtscsi_probe, | |
89107000 | 1130 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1131 | .freeze = virtscsi_freeze, |
1132 | .restore = virtscsi_restore, | |
1133 | #endif | |
6f039790 | 1134 | .remove = virtscsi_remove, |
4fe74b1c PB |
1135 | }; |
1136 | ||
1137 | static int __init init(void) | |
1138 | { | |
1139 | int ret = -ENOMEM; | |
1140 | ||
1141 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
1142 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 1143 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
1144 | goto error; |
1145 | } | |
1146 | ||
1147 | ||
1148 | virtscsi_cmd_pool = | |
1149 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
1150 | virtscsi_cmd_cache); | |
1151 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 1152 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
1153 | goto error; |
1154 | } | |
8904f5a5 SAS |
1155 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, |
1156 | "scsi/virtio:online", | |
1157 | virtscsi_cpu_online, NULL); | |
1158 | if (ret < 0) | |
1159 | goto error; | |
1160 | virtioscsi_online = ret; | |
1161 | ret = cpuhp_setup_state_multi(CPUHP_VIRT_SCSI_DEAD, "scsi/virtio:dead", | |
1162 | NULL, virtscsi_cpu_online); | |
1163 | if (ret) | |
1164 | goto error; | |
4fe74b1c PB |
1165 | ret = register_virtio_driver(&virtio_scsi_driver); |
1166 | if (ret < 0) | |
1167 | goto error; | |
1168 | ||
1169 | return 0; | |
1170 | ||
1171 | error: | |
1172 | if (virtscsi_cmd_pool) { | |
1173 | mempool_destroy(virtscsi_cmd_pool); | |
1174 | virtscsi_cmd_pool = NULL; | |
1175 | } | |
1176 | if (virtscsi_cmd_cache) { | |
1177 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1178 | virtscsi_cmd_cache = NULL; | |
1179 | } | |
8904f5a5 SAS |
1180 | if (virtioscsi_online) |
1181 | cpuhp_remove_multi_state(virtioscsi_online); | |
1182 | cpuhp_remove_multi_state(CPUHP_VIRT_SCSI_DEAD); | |
4fe74b1c PB |
1183 | return ret; |
1184 | } | |
1185 | ||
1186 | static void __exit fini(void) | |
1187 | { | |
1188 | unregister_virtio_driver(&virtio_scsi_driver); | |
8904f5a5 SAS |
1189 | cpuhp_remove_multi_state(virtioscsi_online); |
1190 | cpuhp_remove_multi_state(CPUHP_VIRT_SCSI_DEAD); | |
4fe74b1c PB |
1191 | mempool_destroy(virtscsi_cmd_pool); |
1192 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1193 | } | |
1194 | module_init(init); | |
1195 | module_exit(fini); | |
1196 | ||
1197 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1198 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
1199 | MODULE_LICENSE("GPL"); |