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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> | |
0d9f0a52 | 21 | #include <linux/interrupt.h> |
4fe74b1c PB |
22 | #include <linux/virtio.h> |
23 | #include <linux/virtio_ids.h> | |
24 | #include <linux/virtio_config.h> | |
25 | #include <linux/virtio_scsi.h> | |
9141a4ca | 26 | #include <linux/cpu.h> |
e6dc783a | 27 | #include <linux/blkdev.h> |
4fe74b1c PB |
28 | #include <scsi/scsi_host.h> |
29 | #include <scsi/scsi_device.h> | |
30 | #include <scsi/scsi_cmnd.h> | |
761f1193 | 31 | #include <scsi/scsi_tcq.h> |
25d1d50e | 32 | #include <scsi/scsi_devinfo.h> |
938ece71 | 33 | #include <linux/seqlock.h> |
0d9f0a52 | 34 | #include <linux/blk-mq-virtio.h> |
4fe74b1c PB |
35 | |
36 | #define VIRTIO_SCSI_MEMPOOL_SZ 64 | |
365a7150 | 37 | #define VIRTIO_SCSI_EVENT_LEN 8 |
9141a4ca | 38 | #define VIRTIO_SCSI_VQ_BASE 2 |
4fe74b1c PB |
39 | |
40 | /* Command queue element */ | |
41 | struct virtio_scsi_cmd { | |
42 | struct scsi_cmnd *sc; | |
43 | struct completion *comp; | |
44 | union { | |
45 | struct virtio_scsi_cmd_req cmd; | |
e6dc783a | 46 | struct virtio_scsi_cmd_req_pi cmd_pi; |
4fe74b1c PB |
47 | struct virtio_scsi_ctrl_tmf_req tmf; |
48 | struct virtio_scsi_ctrl_an_req an; | |
49 | } req; | |
50 | union { | |
51 | struct virtio_scsi_cmd_resp cmd; | |
52 | struct virtio_scsi_ctrl_tmf_resp tmf; | |
53 | struct virtio_scsi_ctrl_an_resp an; | |
54 | struct virtio_scsi_event evt; | |
55 | } resp; | |
56 | } ____cacheline_aligned_in_smp; | |
57 | ||
365a7150 CM |
58 | struct virtio_scsi_event_node { |
59 | struct virtio_scsi *vscsi; | |
60 | struct virtio_scsi_event event; | |
61 | struct work_struct work; | |
62 | }; | |
63 | ||
139fe45a PB |
64 | struct virtio_scsi_vq { |
65 | /* Protects vq */ | |
66 | spinlock_t vq_lock; | |
67 | ||
68 | struct virtqueue *vq; | |
69 | }; | |
70 | ||
9141a4ca PB |
71 | /* |
72 | * Per-target queue state. | |
73 | * | |
74 | * This struct holds the data needed by the queue steering policy. When a | |
75 | * target is sent multiple requests, we need to drive them to the same queue so | |
76 | * that FIFO processing order is kept. However, if a target was idle, we can | |
77 | * choose a queue arbitrarily. In this case the queue is chosen according to | |
78 | * the current VCPU, so the driver expects the number of request queues to be | |
79 | * equal to the number of VCPUs. This makes it easy and fast to select the | |
80 | * queue, and also lets the driver optimize the IRQ affinity for the virtqueues | |
81 | * (each virtqueue's affinity is set to the CPU that "owns" the queue). | |
82 | * | |
938ece71 | 83 | * tgt_seq is held to serialize reading and writing req_vq. |
9141a4ca | 84 | * |
f259d9bd ML |
85 | * Decrements of reqs are never concurrent with writes of req_vq: before the |
86 | * decrement reqs will be != 0; after the decrement the virtqueue completion | |
87 | * routine will not use the req_vq so it can be changed by a new request. | |
938ece71 | 88 | * Thus they can happen outside the tgt_seq, provided of course we make reqs |
9141a4ca PB |
89 | * an atomic_t. |
90 | */ | |
2bd37f0f | 91 | struct virtio_scsi_target_state { |
938ece71 | 92 | seqcount_t tgt_seq; |
9141a4ca PB |
93 | |
94 | /* Count of outstanding requests. */ | |
95 | atomic_t reqs; | |
96 | ||
97 | /* Currently active virtqueue for requests sent to this target. */ | |
98 | struct virtio_scsi_vq *req_vq; | |
2bd37f0f PB |
99 | }; |
100 | ||
4fe74b1c PB |
101 | /* Driver instance state */ |
102 | struct virtio_scsi { | |
4fe74b1c | 103 | struct virtio_device *vdev; |
2bd37f0f | 104 | |
365a7150 CM |
105 | /* Get some buffers ready for event vq */ |
106 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
9141a4ca PB |
107 | |
108 | u32 num_queues; | |
109 | ||
110 | /* If the affinity hint is set for virtqueues */ | |
111 | bool affinity_hint_set; | |
112 | ||
8904f5a5 | 113 | struct hlist_node node; |
285e71ea | 114 | |
e67423c7 MT |
115 | /* Protected by event_vq lock */ |
116 | bool stop_events; | |
117 | ||
9141a4ca PB |
118 | struct virtio_scsi_vq ctrl_vq; |
119 | struct virtio_scsi_vq event_vq; | |
120 | struct virtio_scsi_vq req_vqs[]; | |
4fe74b1c PB |
121 | }; |
122 | ||
123 | static struct kmem_cache *virtscsi_cmd_cache; | |
124 | static mempool_t *virtscsi_cmd_pool; | |
125 | ||
126 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
127 | { | |
128 | return vdev->priv; | |
129 | } | |
130 | ||
131 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
132 | { | |
133 | if (!resid) | |
134 | return; | |
135 | ||
136 | if (!scsi_bidi_cmnd(sc)) { | |
137 | scsi_set_resid(sc, resid); | |
138 | return; | |
139 | } | |
140 | ||
141 | scsi_in(sc)->resid = min(resid, scsi_in(sc)->length); | |
142 | scsi_out(sc)->resid = resid - scsi_in(sc)->resid; | |
143 | } | |
144 | ||
145 | /** | |
146 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
147 | * | |
148 | * Called with vq_lock held. | |
149 | */ | |
7f82b3c9 | 150 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
151 | { |
152 | struct virtio_scsi_cmd *cmd = buf; | |
153 | struct scsi_cmnd *sc = cmd->sc; | |
154 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
9141a4ca PB |
155 | struct virtio_scsi_target_state *tgt = |
156 | scsi_target(sc->device)->hostdata; | |
4fe74b1c PB |
157 | |
158 | dev_dbg(&sc->device->sdev_gendev, | |
159 | "cmd %p response %u status %#02x sense_len %u\n", | |
160 | sc, resp->response, resp->status, resp->sense_len); | |
161 | ||
162 | sc->result = resp->status; | |
d75dff39 | 163 | virtscsi_compute_resid(sc, virtio32_to_cpu(vscsi->vdev, resp->resid)); |
4fe74b1c PB |
164 | switch (resp->response) { |
165 | case VIRTIO_SCSI_S_OK: | |
166 | set_host_byte(sc, DID_OK); | |
167 | break; | |
168 | case VIRTIO_SCSI_S_OVERRUN: | |
169 | set_host_byte(sc, DID_ERROR); | |
170 | break; | |
171 | case VIRTIO_SCSI_S_ABORTED: | |
172 | set_host_byte(sc, DID_ABORT); | |
173 | break; | |
174 | case VIRTIO_SCSI_S_BAD_TARGET: | |
175 | set_host_byte(sc, DID_BAD_TARGET); | |
176 | break; | |
177 | case VIRTIO_SCSI_S_RESET: | |
178 | set_host_byte(sc, DID_RESET); | |
179 | break; | |
180 | case VIRTIO_SCSI_S_BUSY: | |
181 | set_host_byte(sc, DID_BUS_BUSY); | |
182 | break; | |
183 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
184 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
185 | break; | |
186 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
187 | set_host_byte(sc, DID_TARGET_FAILURE); | |
188 | break; | |
189 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
190 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
191 | break; | |
192 | default: | |
193 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
194 | resp->response); | |
195 | /* fall through */ | |
196 | case VIRTIO_SCSI_S_FAILURE: | |
197 | set_host_byte(sc, DID_ERROR); | |
198 | break; | |
199 | } | |
200 | ||
d75dff39 MT |
201 | WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) > |
202 | VIRTIO_SCSI_SENSE_SIZE); | |
4fe74b1c PB |
203 | if (sc->sense_buffer) { |
204 | memcpy(sc->sense_buffer, resp->sense, | |
d75dff39 MT |
205 | min_t(u32, |
206 | virtio32_to_cpu(vscsi->vdev, resp->sense_len), | |
207 | VIRTIO_SCSI_SENSE_SIZE)); | |
4fe74b1c PB |
208 | if (resp->sense_len) |
209 | set_driver_byte(sc, DRIVER_SENSE); | |
210 | } | |
211 | ||
4fe74b1c | 212 | sc->scsi_done(sc); |
9141a4ca PB |
213 | |
214 | atomic_dec(&tgt->reqs); | |
4fe74b1c PB |
215 | } |
216 | ||
10f34f64 PB |
217 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
218 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 219 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 220 | { |
4fe74b1c | 221 | void *buf; |
4fe74b1c | 222 | unsigned int len; |
10f34f64 PB |
223 | unsigned long flags; |
224 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 225 | |
10f34f64 | 226 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
227 | do { |
228 | virtqueue_disable_cb(vq); | |
229 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 230 | fn(vscsi, buf); |
2bf4fd31 HG |
231 | |
232 | if (unlikely(virtqueue_is_broken(vq))) | |
233 | break; | |
4fe74b1c | 234 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 235 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
236 | } |
237 | ||
238 | static void virtscsi_req_done(struct virtqueue *vq) | |
239 | { | |
139fe45a PB |
240 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
241 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
242 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
243 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
244 | ||
9141a4ca | 245 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); |
4fe74b1c PB |
246 | }; |
247 | ||
8faeb529 PB |
248 | static void virtscsi_poll_requests(struct virtio_scsi *vscsi) |
249 | { | |
250 | int i, num_vqs; | |
251 | ||
252 | num_vqs = vscsi->num_queues; | |
253 | for (i = 0; i < num_vqs; i++) | |
254 | virtscsi_vq_done(vscsi, &vscsi->req_vqs[i], | |
255 | virtscsi_complete_cmd); | |
256 | } | |
257 | ||
7f82b3c9 | 258 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
259 | { |
260 | struct virtio_scsi_cmd *cmd = buf; | |
261 | ||
262 | if (cmd->comp) | |
e8f81420 | 263 | complete(cmd->comp); |
4fe74b1c PB |
264 | } |
265 | ||
266 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
267 | { | |
139fe45a PB |
268 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
269 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 270 | |
10f34f64 | 271 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
272 | }; |
273 | ||
cdda0e5a PB |
274 | static void virtscsi_handle_event(struct work_struct *work); |
275 | ||
365a7150 CM |
276 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
277 | struct virtio_scsi_event_node *event_node) | |
278 | { | |
4614e51c | 279 | int err; |
365a7150 CM |
280 | struct scatterlist sg; |
281 | unsigned long flags; | |
282 | ||
cdda0e5a | 283 | INIT_WORK(&event_node->work, virtscsi_handle_event); |
2e9c9dfd | 284 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
285 | |
286 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
287 | ||
bf958291 RR |
288 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
289 | GFP_ATOMIC); | |
4614e51c | 290 | if (!err) |
365a7150 CM |
291 | virtqueue_kick(vscsi->event_vq.vq); |
292 | ||
293 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
294 | ||
4614e51c | 295 | return err; |
365a7150 CM |
296 | } |
297 | ||
298 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
299 | { | |
300 | int i; | |
301 | ||
302 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
303 | vscsi->event_list[i].vscsi = vscsi; | |
304 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
311 | { | |
312 | int i; | |
313 | ||
e67423c7 MT |
314 | /* Stop scheduling work before calling cancel_work_sync. */ |
315 | spin_lock_irq(&vscsi->event_vq.vq_lock); | |
316 | vscsi->stop_events = true; | |
317 | spin_unlock_irq(&vscsi->event_vq.vq_lock); | |
318 | ||
365a7150 CM |
319 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) |
320 | cancel_work_sync(&vscsi->event_list[i].work); | |
321 | } | |
322 | ||
323 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 324 | struct virtio_scsi_event *event) |
365a7150 CM |
325 | { |
326 | struct scsi_device *sdev; | |
327 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
328 | unsigned int target = event->lun[1]; | |
329 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
330 | ||
d75dff39 | 331 | switch (virtio32_to_cpu(vscsi->vdev, event->reason)) { |
365a7150 CM |
332 | case VIRTIO_SCSI_EVT_RESET_RESCAN: |
333 | scsi_add_device(shost, 0, target, lun); | |
334 | break; | |
335 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
336 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
337 | if (sdev) { | |
338 | scsi_remove_device(sdev); | |
339 | scsi_device_put(sdev); | |
340 | } else { | |
341 | pr_err("SCSI device %d 0 %d %d not found\n", | |
342 | shost->host_no, target, lun); | |
343 | } | |
344 | break; | |
345 | default: | |
346 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
347 | } | |
348 | } | |
349 | ||
865b58c0 PB |
350 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
351 | struct virtio_scsi_event *event) | |
352 | { | |
353 | struct scsi_device *sdev; | |
354 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
355 | unsigned int target = event->lun[1]; | |
356 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
d75dff39 MT |
357 | u8 asc = virtio32_to_cpu(vscsi->vdev, event->reason) & 255; |
358 | u8 ascq = virtio32_to_cpu(vscsi->vdev, event->reason) >> 8; | |
865b58c0 PB |
359 | |
360 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
361 | if (!sdev) { | |
362 | pr_err("SCSI device %d 0 %d %d not found\n", | |
363 | shost->host_no, target, lun); | |
364 | return; | |
365 | } | |
366 | ||
367 | /* Handle "Parameters changed", "Mode parameters changed", and | |
368 | "Capacity data has changed". */ | |
369 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
370 | scsi_rescan_device(&sdev->sdev_gendev); | |
371 | ||
372 | scsi_device_put(sdev); | |
373 | } | |
374 | ||
365a7150 CM |
375 | static void virtscsi_handle_event(struct work_struct *work) |
376 | { | |
377 | struct virtio_scsi_event_node *event_node = | |
378 | container_of(work, struct virtio_scsi_event_node, work); | |
379 | struct virtio_scsi *vscsi = event_node->vscsi; | |
380 | struct virtio_scsi_event *event = &event_node->event; | |
381 | ||
d75dff39 MT |
382 | if (event->event & |
383 | cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) { | |
384 | event->event &= ~cpu_to_virtio32(vscsi->vdev, | |
385 | VIRTIO_SCSI_T_EVENTS_MISSED); | |
365a7150 CM |
386 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); |
387 | } | |
388 | ||
d75dff39 | 389 | switch (virtio32_to_cpu(vscsi->vdev, event->event)) { |
365a7150 CM |
390 | case VIRTIO_SCSI_T_NO_EVENT: |
391 | break; | |
392 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
393 | virtscsi_handle_transport_reset(vscsi, event); | |
394 | break; | |
865b58c0 PB |
395 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
396 | virtscsi_handle_param_change(vscsi, event); | |
397 | break; | |
365a7150 CM |
398 | default: |
399 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
400 | } | |
401 | virtscsi_kick_event(vscsi, event_node); | |
402 | } | |
403 | ||
7f82b3c9 | 404 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
405 | { |
406 | struct virtio_scsi_event_node *event_node = buf; | |
407 | ||
e67423c7 MT |
408 | if (!vscsi->stop_events) |
409 | queue_work(system_freezable_wq, &event_node->work); | |
365a7150 CM |
410 | } |
411 | ||
4fe74b1c PB |
412 | static void virtscsi_event_done(struct virtqueue *vq) |
413 | { | |
139fe45a PB |
414 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
415 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 416 | |
10f34f64 | 417 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
418 | }; |
419 | ||
4fe74b1c | 420 | /** |
682993b4 WG |
421 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue |
422 | * @vq : the struct virtqueue we're talking about | |
4fe74b1c | 423 | * @cmd : command structure |
4fe74b1c PB |
424 | * @req_size : size of the request buffer |
425 | * @resp_size : size of the response buffer | |
4fe74b1c | 426 | */ |
682993b4 WG |
427 | static int virtscsi_add_cmd(struct virtqueue *vq, |
428 | struct virtio_scsi_cmd *cmd, | |
c77fba9a | 429 | size_t req_size, size_t resp_size) |
4fe74b1c PB |
430 | { |
431 | struct scsi_cmnd *sc = cmd->sc; | |
e6dc783a | 432 | struct scatterlist *sgs[6], req, resp; |
682993b4 WG |
433 | struct sg_table *out, *in; |
434 | unsigned out_num = 0, in_num = 0; | |
435 | ||
436 | out = in = NULL; | |
437 | ||
438 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
439 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
440 | out = &scsi_out(sc)->table; | |
441 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
442 | in = &scsi_in(sc)->table; | |
443 | } | |
4fe74b1c | 444 | |
4fe74b1c | 445 | /* Request header. */ |
682993b4 WG |
446 | sg_init_one(&req, &cmd->req, req_size); |
447 | sgs[out_num++] = &req; | |
4fe74b1c PB |
448 | |
449 | /* Data-out buffer. */ | |
e6dc783a NB |
450 | if (out) { |
451 | /* Place WRITE protection SGLs before Data OUT payload */ | |
452 | if (scsi_prot_sg_count(sc)) | |
453 | sgs[out_num++] = scsi_prot_sglist(sc); | |
682993b4 | 454 | sgs[out_num++] = out->sgl; |
e6dc783a | 455 | } |
4fe74b1c PB |
456 | |
457 | /* Response header. */ | |
682993b4 WG |
458 | sg_init_one(&resp, &cmd->resp, resp_size); |
459 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
460 | |
461 | /* Data-in buffer */ | |
e6dc783a NB |
462 | if (in) { |
463 | /* Place READ protection SGLs before Data IN payload */ | |
464 | if (scsi_prot_sg_count(sc)) | |
465 | sgs[out_num + in_num++] = scsi_prot_sglist(sc); | |
682993b4 | 466 | sgs[out_num + in_num++] = in->sgl; |
e6dc783a | 467 | } |
4fe74b1c | 468 | |
c77fba9a | 469 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC); |
4fe74b1c PB |
470 | } |
471 | ||
682993b4 | 472 | static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, |
4fe74b1c | 473 | struct virtio_scsi_cmd *cmd, |
c77fba9a | 474 | size_t req_size, size_t resp_size) |
4fe74b1c | 475 | { |
4fe74b1c | 476 | unsigned long flags; |
4614e51c RR |
477 | int err; |
478 | bool needs_kick = false; | |
4fe74b1c | 479 | |
682993b4 | 480 | spin_lock_irqsave(&vq->vq_lock, flags); |
c77fba9a | 481 | err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size); |
4614e51c RR |
482 | if (!err) |
483 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 484 | |
bce750b1 | 485 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 486 | |
4614e51c | 487 | if (needs_kick) |
139fe45a | 488 | virtqueue_notify(vq->vq); |
4614e51c | 489 | return err; |
4fe74b1c PB |
490 | } |
491 | ||
d75dff39 MT |
492 | static void virtio_scsi_init_hdr(struct virtio_device *vdev, |
493 | struct virtio_scsi_cmd_req *cmd, | |
e6dc783a NB |
494 | struct scsi_cmnd *sc) |
495 | { | |
496 | cmd->lun[0] = 1; | |
497 | cmd->lun[1] = sc->device->id; | |
498 | cmd->lun[2] = (sc->device->lun >> 8) | 0x40; | |
499 | cmd->lun[3] = sc->device->lun & 0xff; | |
d75dff39 | 500 | cmd->tag = cpu_to_virtio64(vdev, (unsigned long)sc); |
e6dc783a NB |
501 | cmd->task_attr = VIRTIO_SCSI_S_SIMPLE; |
502 | cmd->prio = 0; | |
503 | cmd->crn = 0; | |
504 | } | |
505 | ||
c5c2567f | 506 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
d75dff39 MT |
507 | static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev, |
508 | struct virtio_scsi_cmd_req_pi *cmd_pi, | |
e6dc783a NB |
509 | struct scsi_cmnd *sc) |
510 | { | |
511 | struct request *rq = sc->request; | |
512 | struct blk_integrity *bi; | |
513 | ||
d75dff39 | 514 | virtio_scsi_init_hdr(vdev, (struct virtio_scsi_cmd_req *)cmd_pi, sc); |
e6dc783a NB |
515 | |
516 | if (!rq || !scsi_prot_sg_count(sc)) | |
517 | return; | |
518 | ||
519 | bi = blk_get_integrity(rq->rq_disk); | |
520 | ||
521 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
d75dff39 MT |
522 | cmd_pi->pi_bytesout = cpu_to_virtio32(vdev, |
523 | blk_rq_sectors(rq) * | |
524 | bi->tuple_size); | |
e6dc783a | 525 | else if (sc->sc_data_direction == DMA_FROM_DEVICE) |
d75dff39 MT |
526 | cmd_pi->pi_bytesin = cpu_to_virtio32(vdev, |
527 | blk_rq_sectors(rq) * | |
528 | bi->tuple_size); | |
e6dc783a | 529 | } |
c5c2567f | 530 | #endif |
e6dc783a | 531 | |
9141a4ca PB |
532 | static int virtscsi_queuecommand(struct virtio_scsi *vscsi, |
533 | struct virtio_scsi_vq *req_vq, | |
534 | struct scsi_cmnd *sc) | |
4fe74b1c | 535 | { |
2bd37f0f | 536 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
b54197c4 | 537 | struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc); |
773c7220 | 538 | unsigned long flags; |
ed9ea4ed | 539 | int req_size; |
773c7220 | 540 | int ret; |
b54197c4 | 541 | |
2bd37f0f PB |
542 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
543 | ||
544 | /* TODO: check feature bit and fail if unsupported? */ | |
545 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
546 | ||
4fe74b1c PB |
547 | dev_dbg(&sc->device->sdev_gendev, |
548 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
549 | ||
4fe74b1c PB |
550 | memset(cmd, 0, sizeof(*cmd)); |
551 | cmd->sc = sc; | |
4fe74b1c PB |
552 | |
553 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
4fe74b1c | 554 | |
c5c2567f | 555 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 556 | if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) { |
d75dff39 | 557 | virtio_scsi_init_hdr_pi(vscsi->vdev, &cmd->req.cmd_pi, sc); |
e6dc783a NB |
558 | memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len); |
559 | req_size = sizeof(cmd->req.cmd_pi); | |
c5c2567f CH |
560 | } else |
561 | #endif | |
562 | { | |
d75dff39 | 563 | virtio_scsi_init_hdr(vscsi->vdev, &cmd->req.cmd, sc); |
e6dc783a NB |
564 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); |
565 | req_size = sizeof(cmd->req.cmd); | |
566 | } | |
567 | ||
773c7220 EF |
568 | ret = virtscsi_kick_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd)); |
569 | if (ret == -EIO) { | |
570 | cmd->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; | |
571 | spin_lock_irqsave(&req_vq->vq_lock, flags); | |
572 | virtscsi_complete_cmd(vscsi, cmd); | |
573 | spin_unlock_irqrestore(&req_vq->vq_lock, flags); | |
574 | } else if (ret != 0) { | |
b54197c4 | 575 | return SCSI_MLQUEUE_HOST_BUSY; |
773c7220 | 576 | } |
b54197c4 | 577 | return 0; |
4fe74b1c PB |
578 | } |
579 | ||
9141a4ca PB |
580 | static int virtscsi_queuecommand_single(struct Scsi_Host *sh, |
581 | struct scsi_cmnd *sc) | |
582 | { | |
583 | struct virtio_scsi *vscsi = shost_priv(sh); | |
584 | struct virtio_scsi_target_state *tgt = | |
585 | scsi_target(sc->device)->hostdata; | |
586 | ||
587 | atomic_inc(&tgt->reqs); | |
588 | return virtscsi_queuecommand(vscsi, &vscsi->req_vqs[0], sc); | |
589 | } | |
590 | ||
ccbedf11 ML |
591 | static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi, |
592 | struct scsi_cmnd *sc) | |
593 | { | |
594 | u32 tag = blk_mq_unique_tag(sc->request); | |
595 | u16 hwq = blk_mq_unique_tag_to_hwq(tag); | |
596 | ||
597 | return &vscsi->req_vqs[hwq]; | |
598 | } | |
599 | ||
9141a4ca PB |
600 | static struct virtio_scsi_vq *virtscsi_pick_vq(struct virtio_scsi *vscsi, |
601 | struct virtio_scsi_target_state *tgt) | |
602 | { | |
603 | struct virtio_scsi_vq *vq; | |
604 | unsigned long flags; | |
605 | u32 queue_num; | |
606 | ||
938ece71 ML |
607 | local_irq_save(flags); |
608 | if (atomic_inc_return(&tgt->reqs) > 1) { | |
609 | unsigned long seq; | |
610 | ||
611 | do { | |
612 | seq = read_seqcount_begin(&tgt->tgt_seq); | |
613 | vq = tgt->req_vq; | |
614 | } while (read_seqcount_retry(&tgt->tgt_seq, seq)); | |
615 | } else { | |
616 | /* no writes can be concurrent because of atomic_t */ | |
617 | write_seqcount_begin(&tgt->tgt_seq); | |
618 | ||
619 | /* keep previous req_vq if a reader just arrived */ | |
620 | if (unlikely(atomic_read(&tgt->reqs) > 1)) { | |
621 | vq = tgt->req_vq; | |
622 | goto unlock; | |
623 | } | |
9141a4ca | 624 | |
9141a4ca PB |
625 | queue_num = smp_processor_id(); |
626 | while (unlikely(queue_num >= vscsi->num_queues)) | |
627 | queue_num -= vscsi->num_queues; | |
9141a4ca | 628 | tgt->req_vq = vq = &vscsi->req_vqs[queue_num]; |
938ece71 ML |
629 | unlock: |
630 | write_seqcount_end(&tgt->tgt_seq); | |
9141a4ca | 631 | } |
938ece71 | 632 | local_irq_restore(flags); |
9141a4ca | 633 | |
9141a4ca PB |
634 | return vq; |
635 | } | |
636 | ||
637 | static int virtscsi_queuecommand_multi(struct Scsi_Host *sh, | |
638 | struct scsi_cmnd *sc) | |
639 | { | |
640 | struct virtio_scsi *vscsi = shost_priv(sh); | |
641 | struct virtio_scsi_target_state *tgt = | |
642 | scsi_target(sc->device)->hostdata; | |
ccbedf11 ML |
643 | struct virtio_scsi_vq *req_vq; |
644 | ||
645 | if (shost_use_blk_mq(sh)) | |
646 | req_vq = virtscsi_pick_vq_mq(vscsi, sc); | |
647 | else | |
648 | req_vq = virtscsi_pick_vq(vscsi, tgt); | |
9141a4ca PB |
649 | |
650 | return virtscsi_queuecommand(vscsi, req_vq, sc); | |
651 | } | |
652 | ||
4fe74b1c PB |
653 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) |
654 | { | |
655 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 656 | int ret = FAILED; |
4fe74b1c PB |
657 | |
658 | cmd->comp = ∁ | |
682993b4 | 659 | if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd, |
c77fba9a | 660 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf) < 0) |
e4594bb5 | 661 | goto out; |
4fe74b1c PB |
662 | |
663 | wait_for_completion(&comp); | |
e4594bb5 PB |
664 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
665 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
666 | ret = SUCCESS; | |
4fe74b1c | 667 | |
8faeb529 PB |
668 | /* |
669 | * The spec guarantees that all requests related to the TMF have | |
670 | * been completed, but the callback might not have run yet if | |
671 | * we're using independent interrupts (e.g. MSI). Poll the | |
672 | * virtqueues once. | |
673 | * | |
674 | * In the abort case, sc->scsi_done will do nothing, because | |
675 | * the block layer must have detected a timeout and as a result | |
676 | * REQ_ATOM_COMPLETE has been set. | |
677 | */ | |
678 | virtscsi_poll_requests(vscsi); | |
679 | ||
e4594bb5 PB |
680 | out: |
681 | mempool_free(cmd, virtscsi_cmd_pool); | |
682 | return ret; | |
4fe74b1c PB |
683 | } |
684 | ||
685 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
686 | { | |
687 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
688 | struct virtio_scsi_cmd *cmd; | |
689 | ||
690 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
691 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
692 | if (!cmd) | |
693 | return FAILED; | |
694 | ||
695 | memset(cmd, 0, sizeof(*cmd)); | |
696 | cmd->sc = sc; | |
697 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
698 | .type = VIRTIO_SCSI_T_TMF, | |
d75dff39 MT |
699 | .subtype = cpu_to_virtio32(vscsi->vdev, |
700 | VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET), | |
4fe74b1c PB |
701 | .lun[0] = 1, |
702 | .lun[1] = sc->device->id, | |
703 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
704 | .lun[3] = sc->device->lun & 0xff, | |
705 | }; | |
706 | return virtscsi_tmf(vscsi, cmd); | |
707 | } | |
708 | ||
25d1d50e DG |
709 | static int virtscsi_device_alloc(struct scsi_device *sdevice) |
710 | { | |
711 | /* | |
712 | * Passed through SCSI targets (e.g. with qemu's 'scsi-block') | |
713 | * may have transfer limits which come from the host SCSI | |
714 | * controller or something on the host side other than the | |
715 | * target itself. | |
716 | * | |
717 | * To make this work properly, the hypervisor can adjust the | |
718 | * target's VPD information to advertise these limits. But | |
719 | * for that to work, the guest has to look at the VPD pages, | |
720 | * which we won't do by default if it is an SPC-2 device, even | |
721 | * if it does actually support it. | |
722 | * | |
723 | * So, set the blist to always try to read the VPD pages. | |
724 | */ | |
725 | sdevice->sdev_bflags = BLIST_TRY_VPD_PAGES; | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | ||
761f1193 VS |
731 | /** |
732 | * virtscsi_change_queue_depth() - Change a virtscsi target's queue depth | |
733 | * @sdev: Virtscsi target whose queue depth to change | |
734 | * @qdepth: New queue depth | |
761f1193 | 735 | */ |
db5ed4df | 736 | static int virtscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
761f1193 VS |
737 | { |
738 | struct Scsi_Host *shost = sdev->host; | |
739 | int max_depth = shost->cmd_per_lun; | |
740 | ||
db5ed4df | 741 | return scsi_change_queue_depth(sdev, min(max_depth, qdepth)); |
761f1193 VS |
742 | } |
743 | ||
4fe74b1c PB |
744 | static int virtscsi_abort(struct scsi_cmnd *sc) |
745 | { | |
746 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
747 | struct virtio_scsi_cmd *cmd; | |
748 | ||
749 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
750 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
751 | if (!cmd) | |
752 | return FAILED; | |
753 | ||
754 | memset(cmd, 0, sizeof(*cmd)); | |
755 | cmd->sc = sc; | |
756 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
757 | .type = VIRTIO_SCSI_T_TMF, | |
758 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
759 | .lun[0] = 1, | |
760 | .lun[1] = sc->device->id, | |
761 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
762 | .lun[3] = sc->device->lun & 0xff, | |
d75dff39 | 763 | .tag = cpu_to_virtio64(vscsi->vdev, (unsigned long)sc), |
4fe74b1c PB |
764 | }; |
765 | return virtscsi_tmf(vscsi, cmd); | |
766 | } | |
767 | ||
5c370194 WG |
768 | static int virtscsi_target_alloc(struct scsi_target *starget) |
769 | { | |
938ece71 ML |
770 | struct Scsi_Host *sh = dev_to_shost(starget->dev.parent); |
771 | struct virtio_scsi *vscsi = shost_priv(sh); | |
772 | ||
5c370194 WG |
773 | struct virtio_scsi_target_state *tgt = |
774 | kmalloc(sizeof(*tgt), GFP_KERNEL); | |
775 | if (!tgt) | |
776 | return -ENOMEM; | |
777 | ||
938ece71 | 778 | seqcount_init(&tgt->tgt_seq); |
9141a4ca | 779 | atomic_set(&tgt->reqs, 0); |
938ece71 | 780 | tgt->req_vq = &vscsi->req_vqs[0]; |
5c370194 WG |
781 | |
782 | starget->hostdata = tgt; | |
783 | return 0; | |
784 | } | |
785 | ||
786 | static void virtscsi_target_destroy(struct scsi_target *starget) | |
787 | { | |
788 | struct virtio_scsi_target_state *tgt = starget->hostdata; | |
789 | kfree(tgt); | |
790 | } | |
791 | ||
0d9f0a52 CH |
792 | static int virtscsi_map_queues(struct Scsi_Host *shost) |
793 | { | |
794 | struct virtio_scsi *vscsi = shost_priv(shost); | |
795 | ||
796 | return blk_mq_virtio_map_queues(&shost->tag_set, vscsi->vdev, 2); | |
797 | } | |
798 | ||
9141a4ca PB |
799 | static struct scsi_host_template virtscsi_host_template_single = { |
800 | .module = THIS_MODULE, | |
801 | .name = "Virtio SCSI HBA", | |
802 | .proc_name = "virtio_scsi", | |
803 | .this_id = -1, | |
b54197c4 | 804 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca | 805 | .queuecommand = virtscsi_queuecommand_single, |
761f1193 | 806 | .change_queue_depth = virtscsi_change_queue_depth, |
9141a4ca PB |
807 | .eh_abort_handler = virtscsi_abort, |
808 | .eh_device_reset_handler = virtscsi_device_reset, | |
25d1d50e | 809 | .slave_alloc = virtscsi_device_alloc, |
9141a4ca PB |
810 | |
811 | .can_queue = 1024, | |
812 | .dma_boundary = UINT_MAX, | |
813 | .use_clustering = ENABLE_CLUSTERING, | |
814 | .target_alloc = virtscsi_target_alloc, | |
815 | .target_destroy = virtscsi_target_destroy, | |
c40ecc12 | 816 | .track_queue_depth = 1, |
9141a4ca PB |
817 | }; |
818 | ||
819 | static struct scsi_host_template virtscsi_host_template_multi = { | |
4fe74b1c PB |
820 | .module = THIS_MODULE, |
821 | .name = "Virtio SCSI HBA", | |
822 | .proc_name = "virtio_scsi", | |
4fe74b1c | 823 | .this_id = -1, |
b54197c4 | 824 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca | 825 | .queuecommand = virtscsi_queuecommand_multi, |
761f1193 | 826 | .change_queue_depth = virtscsi_change_queue_depth, |
4fe74b1c PB |
827 | .eh_abort_handler = virtscsi_abort, |
828 | .eh_device_reset_handler = virtscsi_device_reset, | |
829 | ||
830 | .can_queue = 1024, | |
831 | .dma_boundary = UINT_MAX, | |
832 | .use_clustering = ENABLE_CLUSTERING, | |
5c370194 WG |
833 | .target_alloc = virtscsi_target_alloc, |
834 | .target_destroy = virtscsi_target_destroy, | |
0d9f0a52 | 835 | .map_queues = virtscsi_map_queues, |
c40ecc12 | 836 | .track_queue_depth = 1, |
4fe74b1c PB |
837 | }; |
838 | ||
839 | #define virtscsi_config_get(vdev, fld) \ | |
840 | ({ \ | |
841 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
855e0c52 | 842 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
843 | __val; \ |
844 | }) | |
845 | ||
846 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 847 | do { \ |
4fe74b1c | 848 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ |
855e0c52 RR |
849 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
850 | } while(0) | |
4fe74b1c | 851 | |
139fe45a PB |
852 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
853 | struct virtqueue *vq) | |
854 | { | |
855 | spin_lock_init(&virtscsi_vq->vq_lock); | |
856 | virtscsi_vq->vq = vq; | |
857 | } | |
858 | ||
2bd37f0f PB |
859 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
860 | { | |
2bd37f0f PB |
861 | /* Stop all the virtqueues. */ |
862 | vdev->config->reset(vdev); | |
2bd37f0f PB |
863 | vdev->config->del_vqs(vdev); |
864 | } | |
865 | ||
4fe74b1c | 866 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 867 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
868 | { |
869 | int err; | |
9141a4ca PB |
870 | u32 i; |
871 | u32 num_vqs; | |
872 | vq_callback_t **callbacks; | |
873 | const char **names; | |
874 | struct virtqueue **vqs; | |
0d9f0a52 | 875 | struct irq_affinity desc = { .pre_vectors = 2 }; |
9141a4ca PB |
876 | |
877 | num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE; | |
878 | vqs = kmalloc(num_vqs * sizeof(struct virtqueue *), GFP_KERNEL); | |
879 | callbacks = kmalloc(num_vqs * sizeof(vq_callback_t *), GFP_KERNEL); | |
880 | names = kmalloc(num_vqs * sizeof(char *), GFP_KERNEL); | |
881 | ||
882 | if (!callbacks || !vqs || !names) { | |
883 | err = -ENOMEM; | |
884 | goto out; | |
885 | } | |
2bd37f0f | 886 | |
9141a4ca PB |
887 | callbacks[0] = virtscsi_ctrl_done; |
888 | callbacks[1] = virtscsi_event_done; | |
889 | names[0] = "control"; | |
890 | names[1] = "event"; | |
891 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) { | |
892 | callbacks[i] = virtscsi_req_done; | |
893 | names[i] = "request"; | |
894 | } | |
4fe74b1c PB |
895 | |
896 | /* Discover virtqueues and write information to configuration. */ | |
9b2bbdb2 | 897 | err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc); |
4fe74b1c | 898 | if (err) |
9141a4ca | 899 | goto out; |
4fe74b1c | 900 | |
139fe45a PB |
901 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
902 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
903 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
904 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
905 | vqs[i]); | |
906 | ||
4fe74b1c PB |
907 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); |
908 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 909 | |
9141a4ca PB |
910 | err = 0; |
911 | ||
912 | out: | |
913 | kfree(names); | |
914 | kfree(callbacks); | |
915 | kfree(vqs); | |
916 | if (err) | |
917 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 918 | return err; |
4fe74b1c PB |
919 | } |
920 | ||
6f039790 | 921 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
922 | { |
923 | struct Scsi_Host *shost; | |
924 | struct virtio_scsi *vscsi; | |
908a5544 | 925 | int err; |
2bd37f0f | 926 | u32 sg_elems, num_targets; |
4fe74b1c | 927 | u32 cmd_per_lun; |
9141a4ca PB |
928 | u32 num_queues; |
929 | struct scsi_host_template *hostt; | |
930 | ||
8cab3cd6 MT |
931 | if (!vdev->config->get) { |
932 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
933 | __func__); | |
934 | return -EINVAL; | |
935 | } | |
936 | ||
9141a4ca PB |
937 | /* We need to know how many queues before we allocate. */ |
938 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
4fe74b1c | 939 | |
2bd37f0f | 940 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 941 | |
9141a4ca PB |
942 | if (num_queues == 1) |
943 | hostt = &virtscsi_host_template_single; | |
944 | else | |
945 | hostt = &virtscsi_host_template_multi; | |
946 | ||
947 | shost = scsi_host_alloc(hostt, | |
948 | sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues); | |
4fe74b1c PB |
949 | if (!shost) |
950 | return -ENOMEM; | |
951 | ||
2bd37f0f | 952 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
953 | shost->sg_tablesize = sg_elems; |
954 | vscsi = shost_priv(shost); | |
955 | vscsi->vdev = vdev; | |
9141a4ca | 956 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
957 | vdev->priv = shost; |
958 | ||
5c370194 | 959 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
960 | if (err) |
961 | goto virtscsi_init_failed; | |
962 | ||
963 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; | |
964 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
965 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
966 | |
967 | /* LUNs > 256 are reported with format 1, so they go in the range | |
968 | * 16640-32767. | |
969 | */ | |
970 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 971 | shost->max_id = num_targets; |
4fe74b1c PB |
972 | shost->max_channel = 0; |
973 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
ccbedf11 | 974 | shost->nr_hw_queues = num_queues; |
e6dc783a | 975 | |
c5c2567f | 976 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 977 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) { |
908a5544 SR |
978 | int host_prot; |
979 | ||
e6dc783a NB |
980 | host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | |
981 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | | |
982 | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; | |
983 | ||
984 | scsi_host_set_prot(shost, host_prot); | |
985 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
986 | } | |
c5c2567f | 987 | #endif |
e6dc783a | 988 | |
4fe74b1c PB |
989 | err = scsi_add_host(shost, &vdev->dev); |
990 | if (err) | |
991 | goto scsi_add_host_failed; | |
5d8f16d0 MT |
992 | |
993 | virtio_device_ready(vdev); | |
994 | ||
995 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
996 | virtscsi_kick_event_all(vscsi); | |
997 | ||
998 | scsi_scan_host(shost); | |
4fe74b1c PB |
999 | return 0; |
1000 | ||
1001 | scsi_add_host_failed: | |
1002 | vdev->config->del_vqs(vdev); | |
1003 | virtscsi_init_failed: | |
1004 | scsi_host_put(shost); | |
1005 | return err; | |
1006 | } | |
1007 | ||
6f039790 | 1008 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
1009 | { |
1010 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
1011 | struct virtio_scsi *vscsi = shost_priv(shost); |
1012 | ||
1013 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
1014 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
1015 | |
1016 | scsi_remove_host(shost); | |
4fe74b1c PB |
1017 | virtscsi_remove_vqs(vdev); |
1018 | scsi_host_put(shost); | |
1019 | } | |
1020 | ||
89107000 | 1021 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1022 | static int virtscsi_freeze(struct virtio_device *vdev) |
1023 | { | |
1024 | virtscsi_remove_vqs(vdev); | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | static int virtscsi_restore(struct virtio_device *vdev) | |
1029 | { | |
1030 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
1031 | struct virtio_scsi *vscsi = shost_priv(sh); | |
f466f753 AH |
1032 | int err; |
1033 | ||
1034 | err = virtscsi_init(vdev, vscsi); | |
1035 | if (err) | |
1036 | return err; | |
1037 | ||
52c9cf1a MT |
1038 | virtio_device_ready(vdev); |
1039 | ||
cd679048 MT |
1040 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
1041 | virtscsi_kick_event_all(vscsi); | |
4fe74b1c | 1042 | |
f466f753 | 1043 | return err; |
4fe74b1c PB |
1044 | } |
1045 | #endif | |
1046 | ||
1047 | static struct virtio_device_id id_table[] = { | |
1048 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
1049 | { 0 }, | |
1050 | }; | |
1051 | ||
365a7150 | 1052 | static unsigned int features[] = { |
865b58c0 PB |
1053 | VIRTIO_SCSI_F_HOTPLUG, |
1054 | VIRTIO_SCSI_F_CHANGE, | |
c5c2567f | 1055 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 1056 | VIRTIO_SCSI_F_T10_PI, |
c5c2567f | 1057 | #endif |
365a7150 CM |
1058 | }; |
1059 | ||
4fe74b1c | 1060 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
1061 | .feature_table = features, |
1062 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
1063 | .driver.name = KBUILD_MODNAME, |
1064 | .driver.owner = THIS_MODULE, | |
1065 | .id_table = id_table, | |
1066 | .probe = virtscsi_probe, | |
89107000 | 1067 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1068 | .freeze = virtscsi_freeze, |
1069 | .restore = virtscsi_restore, | |
1070 | #endif | |
6f039790 | 1071 | .remove = virtscsi_remove, |
4fe74b1c PB |
1072 | }; |
1073 | ||
1074 | static int __init init(void) | |
1075 | { | |
1076 | int ret = -ENOMEM; | |
1077 | ||
1078 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
1079 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 1080 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
1081 | goto error; |
1082 | } | |
1083 | ||
1084 | ||
1085 | virtscsi_cmd_pool = | |
1086 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
1087 | virtscsi_cmd_cache); | |
1088 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 1089 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
1090 | goto error; |
1091 | } | |
1092 | ret = register_virtio_driver(&virtio_scsi_driver); | |
1093 | if (ret < 0) | |
1094 | goto error; | |
1095 | ||
1096 | return 0; | |
1097 | ||
1098 | error: | |
1099 | if (virtscsi_cmd_pool) { | |
1100 | mempool_destroy(virtscsi_cmd_pool); | |
1101 | virtscsi_cmd_pool = NULL; | |
1102 | } | |
1103 | if (virtscsi_cmd_cache) { | |
1104 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1105 | virtscsi_cmd_cache = NULL; | |
1106 | } | |
1107 | return ret; | |
1108 | } | |
1109 | ||
1110 | static void __exit fini(void) | |
1111 | { | |
1112 | unregister_virtio_driver(&virtio_scsi_driver); | |
1113 | mempool_destroy(virtscsi_cmd_pool); | |
1114 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1115 | } | |
1116 | module_init(init); | |
1117 | module_exit(fini); | |
1118 | ||
1119 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1120 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
1121 | MODULE_LICENSE("GPL"); |