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