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 | ||
9141a4ca PB |
113 | struct virtio_scsi_vq ctrl_vq; |
114 | struct virtio_scsi_vq event_vq; | |
115 | struct virtio_scsi_vq req_vqs[]; | |
4fe74b1c PB |
116 | }; |
117 | ||
118 | static struct kmem_cache *virtscsi_cmd_cache; | |
119 | static mempool_t *virtscsi_cmd_pool; | |
120 | ||
121 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
122 | { | |
123 | return vdev->priv; | |
124 | } | |
125 | ||
126 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
127 | { | |
128 | if (!resid) | |
129 | return; | |
130 | ||
131 | if (!scsi_bidi_cmnd(sc)) { | |
132 | scsi_set_resid(sc, resid); | |
133 | return; | |
134 | } | |
135 | ||
136 | scsi_in(sc)->resid = min(resid, scsi_in(sc)->length); | |
137 | scsi_out(sc)->resid = resid - scsi_in(sc)->resid; | |
138 | } | |
139 | ||
140 | /** | |
141 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done | |
142 | * | |
143 | * Called with vq_lock held. | |
144 | */ | |
7f82b3c9 | 145 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
146 | { |
147 | struct virtio_scsi_cmd *cmd = buf; | |
148 | struct scsi_cmnd *sc = cmd->sc; | |
149 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
9141a4ca PB |
150 | struct virtio_scsi_target_state *tgt = |
151 | scsi_target(sc->device)->hostdata; | |
4fe74b1c PB |
152 | |
153 | dev_dbg(&sc->device->sdev_gendev, | |
154 | "cmd %p response %u status %#02x sense_len %u\n", | |
155 | sc, resp->response, resp->status, resp->sense_len); | |
156 | ||
157 | sc->result = resp->status; | |
158 | virtscsi_compute_resid(sc, resp->resid); | |
159 | switch (resp->response) { | |
160 | case VIRTIO_SCSI_S_OK: | |
161 | set_host_byte(sc, DID_OK); | |
162 | break; | |
163 | case VIRTIO_SCSI_S_OVERRUN: | |
164 | set_host_byte(sc, DID_ERROR); | |
165 | break; | |
166 | case VIRTIO_SCSI_S_ABORTED: | |
167 | set_host_byte(sc, DID_ABORT); | |
168 | break; | |
169 | case VIRTIO_SCSI_S_BAD_TARGET: | |
170 | set_host_byte(sc, DID_BAD_TARGET); | |
171 | break; | |
172 | case VIRTIO_SCSI_S_RESET: | |
173 | set_host_byte(sc, DID_RESET); | |
174 | break; | |
175 | case VIRTIO_SCSI_S_BUSY: | |
176 | set_host_byte(sc, DID_BUS_BUSY); | |
177 | break; | |
178 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
179 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
180 | break; | |
181 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
182 | set_host_byte(sc, DID_TARGET_FAILURE); | |
183 | break; | |
184 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
185 | set_host_byte(sc, DID_NEXUS_FAILURE); | |
186 | break; | |
187 | default: | |
188 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
189 | resp->response); | |
190 | /* fall through */ | |
191 | case VIRTIO_SCSI_S_FAILURE: | |
192 | set_host_byte(sc, DID_ERROR); | |
193 | break; | |
194 | } | |
195 | ||
196 | WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE); | |
197 | if (sc->sense_buffer) { | |
198 | memcpy(sc->sense_buffer, resp->sense, | |
199 | min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE)); | |
200 | if (resp->sense_len) | |
201 | set_driver_byte(sc, DRIVER_SENSE); | |
202 | } | |
203 | ||
4fe74b1c | 204 | sc->scsi_done(sc); |
9141a4ca PB |
205 | |
206 | atomic_dec(&tgt->reqs); | |
4fe74b1c PB |
207 | } |
208 | ||
10f34f64 PB |
209 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
210 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 211 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 212 | { |
4fe74b1c | 213 | void *buf; |
4fe74b1c | 214 | unsigned int len; |
10f34f64 PB |
215 | unsigned long flags; |
216 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 217 | |
10f34f64 | 218 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
219 | do { |
220 | virtqueue_disable_cb(vq); | |
221 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 222 | fn(vscsi, buf); |
2bf4fd31 HG |
223 | |
224 | if (unlikely(virtqueue_is_broken(vq))) | |
225 | break; | |
4fe74b1c | 226 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 227 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
228 | } |
229 | ||
230 | static void virtscsi_req_done(struct virtqueue *vq) | |
231 | { | |
139fe45a PB |
232 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
233 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
234 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
235 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
236 | ||
9141a4ca | 237 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); |
4fe74b1c PB |
238 | }; |
239 | ||
8faeb529 PB |
240 | static void virtscsi_poll_requests(struct virtio_scsi *vscsi) |
241 | { | |
242 | int i, num_vqs; | |
243 | ||
244 | num_vqs = vscsi->num_queues; | |
245 | for (i = 0; i < num_vqs; i++) | |
246 | virtscsi_vq_done(vscsi, &vscsi->req_vqs[i], | |
247 | virtscsi_complete_cmd); | |
248 | } | |
249 | ||
7f82b3c9 | 250 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
251 | { |
252 | struct virtio_scsi_cmd *cmd = buf; | |
253 | ||
254 | if (cmd->comp) | |
255 | complete_all(cmd->comp); | |
4fe74b1c PB |
256 | } |
257 | ||
258 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
259 | { | |
139fe45a PB |
260 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
261 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 262 | |
10f34f64 | 263 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
264 | }; |
265 | ||
cdda0e5a PB |
266 | static void virtscsi_handle_event(struct work_struct *work); |
267 | ||
365a7150 CM |
268 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
269 | struct virtio_scsi_event_node *event_node) | |
270 | { | |
4614e51c | 271 | int err; |
365a7150 CM |
272 | struct scatterlist sg; |
273 | unsigned long flags; | |
274 | ||
cdda0e5a | 275 | INIT_WORK(&event_node->work, virtscsi_handle_event); |
2e9c9dfd | 276 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
277 | |
278 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
279 | ||
bf958291 RR |
280 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
281 | GFP_ATOMIC); | |
4614e51c | 282 | if (!err) |
365a7150 CM |
283 | virtqueue_kick(vscsi->event_vq.vq); |
284 | ||
285 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
286 | ||
4614e51c | 287 | return err; |
365a7150 CM |
288 | } |
289 | ||
290 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
291 | { | |
292 | int i; | |
293 | ||
294 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
295 | vscsi->event_list[i].vscsi = vscsi; | |
296 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
297 | } | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
303 | { | |
304 | int i; | |
305 | ||
306 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) | |
307 | cancel_work_sync(&vscsi->event_list[i].work); | |
308 | } | |
309 | ||
310 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 311 | struct virtio_scsi_event *event) |
365a7150 CM |
312 | { |
313 | struct scsi_device *sdev; | |
314 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
315 | unsigned int target = event->lun[1]; | |
316 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
317 | ||
318 | switch (event->reason) { | |
319 | case VIRTIO_SCSI_EVT_RESET_RESCAN: | |
320 | scsi_add_device(shost, 0, target, lun); | |
321 | break; | |
322 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
323 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
324 | if (sdev) { | |
325 | scsi_remove_device(sdev); | |
326 | scsi_device_put(sdev); | |
327 | } else { | |
328 | pr_err("SCSI device %d 0 %d %d not found\n", | |
329 | shost->host_no, target, lun); | |
330 | } | |
331 | break; | |
332 | default: | |
333 | pr_info("Unsupport virtio scsi event reason %x\n", event->reason); | |
334 | } | |
335 | } | |
336 | ||
865b58c0 PB |
337 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
338 | struct virtio_scsi_event *event) | |
339 | { | |
340 | struct scsi_device *sdev; | |
341 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
342 | unsigned int target = event->lun[1]; | |
343 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
344 | u8 asc = event->reason & 255; | |
345 | u8 ascq = event->reason >> 8; | |
346 | ||
347 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
348 | if (!sdev) { | |
349 | pr_err("SCSI device %d 0 %d %d not found\n", | |
350 | shost->host_no, target, lun); | |
351 | return; | |
352 | } | |
353 | ||
354 | /* Handle "Parameters changed", "Mode parameters changed", and | |
355 | "Capacity data has changed". */ | |
356 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
357 | scsi_rescan_device(&sdev->sdev_gendev); | |
358 | ||
359 | scsi_device_put(sdev); | |
360 | } | |
361 | ||
365a7150 CM |
362 | static void virtscsi_handle_event(struct work_struct *work) |
363 | { | |
364 | struct virtio_scsi_event_node *event_node = | |
365 | container_of(work, struct virtio_scsi_event_node, work); | |
366 | struct virtio_scsi *vscsi = event_node->vscsi; | |
367 | struct virtio_scsi_event *event = &event_node->event; | |
368 | ||
369 | if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) { | |
370 | event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED; | |
371 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); | |
372 | } | |
373 | ||
374 | switch (event->event) { | |
375 | case VIRTIO_SCSI_T_NO_EVENT: | |
376 | break; | |
377 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
378 | virtscsi_handle_transport_reset(vscsi, event); | |
379 | break; | |
865b58c0 PB |
380 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
381 | virtscsi_handle_param_change(vscsi, event); | |
382 | break; | |
365a7150 CM |
383 | default: |
384 | pr_err("Unsupport virtio scsi event %x\n", event->event); | |
385 | } | |
386 | virtscsi_kick_event(vscsi, event_node); | |
387 | } | |
388 | ||
7f82b3c9 | 389 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
390 | { |
391 | struct virtio_scsi_event_node *event_node = buf; | |
392 | ||
365a7150 CM |
393 | schedule_work(&event_node->work); |
394 | } | |
395 | ||
4fe74b1c PB |
396 | static void virtscsi_event_done(struct virtqueue *vq) |
397 | { | |
139fe45a PB |
398 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
399 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 400 | |
10f34f64 | 401 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
402 | }; |
403 | ||
4fe74b1c | 404 | /** |
682993b4 WG |
405 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue |
406 | * @vq : the struct virtqueue we're talking about | |
4fe74b1c | 407 | * @cmd : command structure |
4fe74b1c PB |
408 | * @req_size : size of the request buffer |
409 | * @resp_size : size of the response buffer | |
4fe74b1c | 410 | */ |
682993b4 WG |
411 | static int virtscsi_add_cmd(struct virtqueue *vq, |
412 | struct virtio_scsi_cmd *cmd, | |
c77fba9a | 413 | size_t req_size, size_t resp_size) |
4fe74b1c PB |
414 | { |
415 | struct scsi_cmnd *sc = cmd->sc; | |
e6dc783a | 416 | struct scatterlist *sgs[6], req, resp; |
682993b4 WG |
417 | struct sg_table *out, *in; |
418 | unsigned out_num = 0, in_num = 0; | |
419 | ||
420 | out = in = NULL; | |
421 | ||
422 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
423 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
424 | out = &scsi_out(sc)->table; | |
425 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
426 | in = &scsi_in(sc)->table; | |
427 | } | |
4fe74b1c | 428 | |
4fe74b1c | 429 | /* Request header. */ |
682993b4 WG |
430 | sg_init_one(&req, &cmd->req, req_size); |
431 | sgs[out_num++] = &req; | |
4fe74b1c PB |
432 | |
433 | /* Data-out buffer. */ | |
e6dc783a NB |
434 | if (out) { |
435 | /* Place WRITE protection SGLs before Data OUT payload */ | |
436 | if (scsi_prot_sg_count(sc)) | |
437 | sgs[out_num++] = scsi_prot_sglist(sc); | |
682993b4 | 438 | sgs[out_num++] = out->sgl; |
e6dc783a | 439 | } |
4fe74b1c PB |
440 | |
441 | /* Response header. */ | |
682993b4 WG |
442 | sg_init_one(&resp, &cmd->resp, resp_size); |
443 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
444 | |
445 | /* Data-in buffer */ | |
e6dc783a NB |
446 | if (in) { |
447 | /* Place READ protection SGLs before Data IN payload */ | |
448 | if (scsi_prot_sg_count(sc)) | |
449 | sgs[out_num + in_num++] = scsi_prot_sglist(sc); | |
682993b4 | 450 | sgs[out_num + in_num++] = in->sgl; |
e6dc783a | 451 | } |
4fe74b1c | 452 | |
c77fba9a | 453 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC); |
4fe74b1c PB |
454 | } |
455 | ||
682993b4 | 456 | static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, |
4fe74b1c | 457 | struct virtio_scsi_cmd *cmd, |
c77fba9a | 458 | size_t req_size, size_t resp_size) |
4fe74b1c | 459 | { |
4fe74b1c | 460 | unsigned long flags; |
4614e51c RR |
461 | int err; |
462 | bool needs_kick = false; | |
4fe74b1c | 463 | |
682993b4 | 464 | spin_lock_irqsave(&vq->vq_lock, flags); |
c77fba9a | 465 | err = virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size); |
4614e51c RR |
466 | if (!err) |
467 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
139fe45a | 468 | |
bce750b1 | 469 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 470 | |
4614e51c | 471 | if (needs_kick) |
139fe45a | 472 | virtqueue_notify(vq->vq); |
4614e51c | 473 | return err; |
4fe74b1c PB |
474 | } |
475 | ||
e6dc783a NB |
476 | static void virtio_scsi_init_hdr(struct virtio_scsi_cmd_req *cmd, |
477 | struct scsi_cmnd *sc) | |
478 | { | |
479 | cmd->lun[0] = 1; | |
480 | cmd->lun[1] = sc->device->id; | |
481 | cmd->lun[2] = (sc->device->lun >> 8) | 0x40; | |
482 | cmd->lun[3] = sc->device->lun & 0xff; | |
483 | cmd->tag = (unsigned long)sc; | |
484 | cmd->task_attr = VIRTIO_SCSI_S_SIMPLE; | |
485 | cmd->prio = 0; | |
486 | cmd->crn = 0; | |
487 | } | |
488 | ||
489 | static void virtio_scsi_init_hdr_pi(struct virtio_scsi_cmd_req_pi *cmd_pi, | |
490 | struct scsi_cmnd *sc) | |
491 | { | |
492 | struct request *rq = sc->request; | |
493 | struct blk_integrity *bi; | |
494 | ||
495 | virtio_scsi_init_hdr((struct virtio_scsi_cmd_req *)cmd_pi, sc); | |
496 | ||
497 | if (!rq || !scsi_prot_sg_count(sc)) | |
498 | return; | |
499 | ||
500 | bi = blk_get_integrity(rq->rq_disk); | |
501 | ||
502 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
503 | cmd_pi->pi_bytesout = blk_rq_sectors(rq) * bi->tuple_size; | |
504 | else if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
505 | cmd_pi->pi_bytesin = blk_rq_sectors(rq) * bi->tuple_size; | |
506 | } | |
507 | ||
9141a4ca PB |
508 | static int virtscsi_queuecommand(struct virtio_scsi *vscsi, |
509 | struct virtio_scsi_vq *req_vq, | |
510 | struct scsi_cmnd *sc) | |
4fe74b1c | 511 | { |
2bd37f0f | 512 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); |
b54197c4 | 513 | struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc); |
ed9ea4ed | 514 | int req_size; |
b54197c4 | 515 | |
2bd37f0f PB |
516 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
517 | ||
518 | /* TODO: check feature bit and fail if unsupported? */ | |
519 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
520 | ||
4fe74b1c PB |
521 | dev_dbg(&sc->device->sdev_gendev, |
522 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
523 | ||
4fe74b1c PB |
524 | memset(cmd, 0, sizeof(*cmd)); |
525 | cmd->sc = sc; | |
4fe74b1c PB |
526 | |
527 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
4fe74b1c | 528 | |
e6dc783a NB |
529 | if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) { |
530 | virtio_scsi_init_hdr_pi(&cmd->req.cmd_pi, sc); | |
531 | memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len); | |
532 | req_size = sizeof(cmd->req.cmd_pi); | |
533 | } else { | |
534 | virtio_scsi_init_hdr(&cmd->req.cmd, sc); | |
535 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); | |
536 | req_size = sizeof(cmd->req.cmd); | |
537 | } | |
538 | ||
ed9ea4ed | 539 | if (virtscsi_kick_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd)) != 0) |
b54197c4 CH |
540 | return SCSI_MLQUEUE_HOST_BUSY; |
541 | return 0; | |
4fe74b1c PB |
542 | } |
543 | ||
9141a4ca PB |
544 | static int virtscsi_queuecommand_single(struct Scsi_Host *sh, |
545 | struct scsi_cmnd *sc) | |
546 | { | |
547 | struct virtio_scsi *vscsi = shost_priv(sh); | |
548 | struct virtio_scsi_target_state *tgt = | |
549 | scsi_target(sc->device)->hostdata; | |
550 | ||
551 | atomic_inc(&tgt->reqs); | |
552 | return virtscsi_queuecommand(vscsi, &vscsi->req_vqs[0], sc); | |
553 | } | |
554 | ||
555 | static struct virtio_scsi_vq *virtscsi_pick_vq(struct virtio_scsi *vscsi, | |
556 | struct virtio_scsi_target_state *tgt) | |
557 | { | |
558 | struct virtio_scsi_vq *vq; | |
559 | unsigned long flags; | |
560 | u32 queue_num; | |
561 | ||
938ece71 ML |
562 | local_irq_save(flags); |
563 | if (atomic_inc_return(&tgt->reqs) > 1) { | |
564 | unsigned long seq; | |
565 | ||
566 | do { | |
567 | seq = read_seqcount_begin(&tgt->tgt_seq); | |
568 | vq = tgt->req_vq; | |
569 | } while (read_seqcount_retry(&tgt->tgt_seq, seq)); | |
570 | } else { | |
571 | /* no writes can be concurrent because of atomic_t */ | |
572 | write_seqcount_begin(&tgt->tgt_seq); | |
573 | ||
574 | /* keep previous req_vq if a reader just arrived */ | |
575 | if (unlikely(atomic_read(&tgt->reqs) > 1)) { | |
576 | vq = tgt->req_vq; | |
577 | goto unlock; | |
578 | } | |
9141a4ca | 579 | |
9141a4ca PB |
580 | queue_num = smp_processor_id(); |
581 | while (unlikely(queue_num >= vscsi->num_queues)) | |
582 | queue_num -= vscsi->num_queues; | |
9141a4ca | 583 | tgt->req_vq = vq = &vscsi->req_vqs[queue_num]; |
938ece71 ML |
584 | unlock: |
585 | write_seqcount_end(&tgt->tgt_seq); | |
9141a4ca | 586 | } |
938ece71 | 587 | local_irq_restore(flags); |
9141a4ca | 588 | |
9141a4ca PB |
589 | return vq; |
590 | } | |
591 | ||
592 | static int virtscsi_queuecommand_multi(struct Scsi_Host *sh, | |
593 | struct scsi_cmnd *sc) | |
594 | { | |
595 | struct virtio_scsi *vscsi = shost_priv(sh); | |
596 | struct virtio_scsi_target_state *tgt = | |
597 | scsi_target(sc->device)->hostdata; | |
598 | struct virtio_scsi_vq *req_vq = virtscsi_pick_vq(vscsi, tgt); | |
599 | ||
600 | return virtscsi_queuecommand(vscsi, req_vq, sc); | |
601 | } | |
602 | ||
4fe74b1c PB |
603 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) |
604 | { | |
605 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 606 | int ret = FAILED; |
4fe74b1c PB |
607 | |
608 | cmd->comp = ∁ | |
682993b4 | 609 | if (virtscsi_kick_cmd(&vscsi->ctrl_vq, cmd, |
c77fba9a | 610 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf) < 0) |
e4594bb5 | 611 | goto out; |
4fe74b1c PB |
612 | |
613 | wait_for_completion(&comp); | |
e4594bb5 PB |
614 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
615 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
616 | ret = SUCCESS; | |
4fe74b1c | 617 | |
8faeb529 PB |
618 | /* |
619 | * The spec guarantees that all requests related to the TMF have | |
620 | * been completed, but the callback might not have run yet if | |
621 | * we're using independent interrupts (e.g. MSI). Poll the | |
622 | * virtqueues once. | |
623 | * | |
624 | * In the abort case, sc->scsi_done will do nothing, because | |
625 | * the block layer must have detected a timeout and as a result | |
626 | * REQ_ATOM_COMPLETE has been set. | |
627 | */ | |
628 | virtscsi_poll_requests(vscsi); | |
629 | ||
e4594bb5 PB |
630 | out: |
631 | mempool_free(cmd, virtscsi_cmd_pool); | |
632 | return ret; | |
4fe74b1c PB |
633 | } |
634 | ||
635 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
636 | { | |
637 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
638 | struct virtio_scsi_cmd *cmd; | |
639 | ||
640 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
641 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
642 | if (!cmd) | |
643 | return FAILED; | |
644 | ||
645 | memset(cmd, 0, sizeof(*cmd)); | |
646 | cmd->sc = sc; | |
647 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
648 | .type = VIRTIO_SCSI_T_TMF, | |
649 | .subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET, | |
650 | .lun[0] = 1, | |
651 | .lun[1] = sc->device->id, | |
652 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
653 | .lun[3] = sc->device->lun & 0xff, | |
654 | }; | |
655 | return virtscsi_tmf(vscsi, cmd); | |
656 | } | |
657 | ||
761f1193 VS |
658 | /** |
659 | * virtscsi_change_queue_depth() - Change a virtscsi target's queue depth | |
660 | * @sdev: Virtscsi target whose queue depth to change | |
661 | * @qdepth: New queue depth | |
662 | * @reason: Reason for the queue depth change. | |
663 | */ | |
664 | static int virtscsi_change_queue_depth(struct scsi_device *sdev, | |
665 | int qdepth, | |
666 | int reason) | |
667 | { | |
668 | struct Scsi_Host *shost = sdev->host; | |
669 | int max_depth = shost->cmd_per_lun; | |
670 | ||
671 | switch (reason) { | |
672 | case SCSI_QDEPTH_QFULL: /* Drop qdepth in response to BUSY state */ | |
673 | scsi_track_queue_full(sdev, qdepth); | |
674 | break; | |
675 | case SCSI_QDEPTH_RAMP_UP: /* Raise qdepth after BUSY state resolved */ | |
676 | case SCSI_QDEPTH_DEFAULT: /* Manual change via sysfs */ | |
677 | scsi_adjust_queue_depth(sdev, | |
678 | scsi_get_tag_type(sdev), | |
679 | min(max_depth, qdepth)); | |
680 | break; | |
681 | default: | |
682 | return -EOPNOTSUPP; | |
683 | } | |
684 | ||
685 | return sdev->queue_depth; | |
686 | } | |
687 | ||
4fe74b1c PB |
688 | static int virtscsi_abort(struct scsi_cmnd *sc) |
689 | { | |
690 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
691 | struct virtio_scsi_cmd *cmd; | |
692 | ||
693 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
694 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
695 | if (!cmd) | |
696 | return FAILED; | |
697 | ||
698 | memset(cmd, 0, sizeof(*cmd)); | |
699 | cmd->sc = sc; | |
700 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ | |
701 | .type = VIRTIO_SCSI_T_TMF, | |
702 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
703 | .lun[0] = 1, | |
704 | .lun[1] = sc->device->id, | |
705 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
706 | .lun[3] = sc->device->lun & 0xff, | |
707 | .tag = (unsigned long)sc, | |
708 | }; | |
709 | return virtscsi_tmf(vscsi, cmd); | |
710 | } | |
711 | ||
5c370194 WG |
712 | static int virtscsi_target_alloc(struct scsi_target *starget) |
713 | { | |
938ece71 ML |
714 | struct Scsi_Host *sh = dev_to_shost(starget->dev.parent); |
715 | struct virtio_scsi *vscsi = shost_priv(sh); | |
716 | ||
5c370194 WG |
717 | struct virtio_scsi_target_state *tgt = |
718 | kmalloc(sizeof(*tgt), GFP_KERNEL); | |
719 | if (!tgt) | |
720 | return -ENOMEM; | |
721 | ||
938ece71 | 722 | seqcount_init(&tgt->tgt_seq); |
9141a4ca | 723 | atomic_set(&tgt->reqs, 0); |
938ece71 | 724 | tgt->req_vq = &vscsi->req_vqs[0]; |
5c370194 WG |
725 | |
726 | starget->hostdata = tgt; | |
727 | return 0; | |
728 | } | |
729 | ||
730 | static void virtscsi_target_destroy(struct scsi_target *starget) | |
731 | { | |
732 | struct virtio_scsi_target_state *tgt = starget->hostdata; | |
733 | kfree(tgt); | |
734 | } | |
735 | ||
9141a4ca PB |
736 | static struct scsi_host_template virtscsi_host_template_single = { |
737 | .module = THIS_MODULE, | |
738 | .name = "Virtio SCSI HBA", | |
739 | .proc_name = "virtio_scsi", | |
740 | .this_id = -1, | |
b54197c4 | 741 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca | 742 | .queuecommand = virtscsi_queuecommand_single, |
761f1193 | 743 | .change_queue_depth = virtscsi_change_queue_depth, |
9141a4ca PB |
744 | .eh_abort_handler = virtscsi_abort, |
745 | .eh_device_reset_handler = virtscsi_device_reset, | |
746 | ||
747 | .can_queue = 1024, | |
748 | .dma_boundary = UINT_MAX, | |
749 | .use_clustering = ENABLE_CLUSTERING, | |
750 | .target_alloc = virtscsi_target_alloc, | |
751 | .target_destroy = virtscsi_target_destroy, | |
752 | }; | |
753 | ||
754 | static struct scsi_host_template virtscsi_host_template_multi = { | |
4fe74b1c PB |
755 | .module = THIS_MODULE, |
756 | .name = "Virtio SCSI HBA", | |
757 | .proc_name = "virtio_scsi", | |
4fe74b1c | 758 | .this_id = -1, |
b54197c4 | 759 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
9141a4ca | 760 | .queuecommand = virtscsi_queuecommand_multi, |
761f1193 | 761 | .change_queue_depth = virtscsi_change_queue_depth, |
4fe74b1c 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, | |
5c370194 WG |
768 | .target_alloc = virtscsi_target_alloc, |
769 | .target_destroy = virtscsi_target_destroy, | |
4fe74b1c PB |
770 | }; |
771 | ||
772 | #define virtscsi_config_get(vdev, fld) \ | |
773 | ({ \ | |
774 | typeof(((struct virtio_scsi_config *)0)->fld) __val; \ | |
855e0c52 | 775 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
776 | __val; \ |
777 | }) | |
778 | ||
779 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 780 | do { \ |
4fe74b1c | 781 | typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \ |
855e0c52 RR |
782 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
783 | } while(0) | |
4fe74b1c | 784 | |
9141a4ca PB |
785 | static void __virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) |
786 | { | |
787 | int i; | |
788 | int cpu; | |
789 | ||
790 | /* In multiqueue mode, when the number of cpu is equal | |
791 | * to the number of request queues, we let the qeueues | |
792 | * to be private to one cpu by setting the affinity hint | |
793 | * to eliminate the contention. | |
794 | */ | |
795 | if ((vscsi->num_queues == 1 || | |
796 | vscsi->num_queues != num_online_cpus()) && affinity) { | |
797 | if (vscsi->affinity_hint_set) | |
798 | affinity = false; | |
799 | else | |
800 | return; | |
801 | } | |
802 | ||
803 | if (affinity) { | |
804 | i = 0; | |
805 | for_each_online_cpu(cpu) { | |
806 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, cpu); | |
807 | i++; | |
808 | } | |
809 | ||
810 | vscsi->affinity_hint_set = true; | |
811 | } else { | |
0c8482ac FZ |
812 | for (i = 0; i < vscsi->num_queues; i++) { |
813 | if (!vscsi->req_vqs[i].vq) | |
814 | continue; | |
815 | ||
9141a4ca | 816 | virtqueue_set_affinity(vscsi->req_vqs[i].vq, -1); |
0c8482ac | 817 | } |
9141a4ca PB |
818 | |
819 | vscsi->affinity_hint_set = false; | |
820 | } | |
821 | } | |
822 | ||
823 | static void virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) | |
824 | { | |
825 | get_online_cpus(); | |
826 | __virtscsi_set_affinity(vscsi, affinity); | |
827 | put_online_cpus(); | |
828 | } | |
829 | ||
285e71ea WG |
830 | static int virtscsi_cpu_callback(struct notifier_block *nfb, |
831 | unsigned long action, void *hcpu) | |
832 | { | |
833 | struct virtio_scsi *vscsi = container_of(nfb, struct virtio_scsi, nb); | |
834 | switch(action) { | |
835 | case CPU_ONLINE: | |
836 | case CPU_ONLINE_FROZEN: | |
837 | case CPU_DEAD: | |
838 | case CPU_DEAD_FROZEN: | |
839 | __virtscsi_set_affinity(vscsi, true); | |
840 | break; | |
841 | default: | |
842 | break; | |
843 | } | |
844 | return NOTIFY_OK; | |
845 | } | |
846 | ||
139fe45a PB |
847 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
848 | struct virtqueue *vq) | |
849 | { | |
850 | spin_lock_init(&virtscsi_vq->vq_lock); | |
851 | virtscsi_vq->vq = vq; | |
852 | } | |
853 | ||
59057fbc NB |
854 | static void virtscsi_scan(struct virtio_device *vdev) |
855 | { | |
cd679048 MT |
856 | struct Scsi_Host *shost = virtio_scsi_host(vdev); |
857 | struct virtio_scsi *vscsi = shost_priv(shost); | |
858 | ||
859 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
860 | virtscsi_kick_event_all(vscsi); | |
59057fbc NB |
861 | |
862 | scsi_scan_host(shost); | |
863 | } | |
864 | ||
2bd37f0f PB |
865 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
866 | { | |
9141a4ca PB |
867 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
868 | struct virtio_scsi *vscsi = shost_priv(sh); | |
869 | ||
870 | virtscsi_set_affinity(vscsi, false); | |
871 | ||
2bd37f0f PB |
872 | /* Stop all the virtqueues. */ |
873 | vdev->config->reset(vdev); | |
874 | ||
2bd37f0f PB |
875 | vdev->config->del_vqs(vdev); |
876 | } | |
877 | ||
4fe74b1c | 878 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 879 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
880 | { |
881 | int err; | |
9141a4ca PB |
882 | u32 i; |
883 | u32 num_vqs; | |
884 | vq_callback_t **callbacks; | |
885 | const char **names; | |
886 | struct virtqueue **vqs; | |
887 | ||
888 | num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE; | |
889 | vqs = kmalloc(num_vqs * sizeof(struct virtqueue *), GFP_KERNEL); | |
890 | callbacks = kmalloc(num_vqs * sizeof(vq_callback_t *), GFP_KERNEL); | |
891 | names = kmalloc(num_vqs * sizeof(char *), GFP_KERNEL); | |
892 | ||
893 | if (!callbacks || !vqs || !names) { | |
894 | err = -ENOMEM; | |
895 | goto out; | |
896 | } | |
2bd37f0f | 897 | |
9141a4ca PB |
898 | callbacks[0] = virtscsi_ctrl_done; |
899 | callbacks[1] = virtscsi_event_done; | |
900 | names[0] = "control"; | |
901 | names[1] = "event"; | |
902 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) { | |
903 | callbacks[i] = virtscsi_req_done; | |
904 | names[i] = "request"; | |
905 | } | |
4fe74b1c PB |
906 | |
907 | /* Discover virtqueues and write information to configuration. */ | |
9141a4ca | 908 | err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names); |
4fe74b1c | 909 | if (err) |
9141a4ca | 910 | goto out; |
4fe74b1c | 911 | |
139fe45a PB |
912 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
913 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
914 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
915 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
916 | vqs[i]); | |
917 | ||
918 | virtscsi_set_affinity(vscsi, true); | |
4fe74b1c PB |
919 | |
920 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); | |
921 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 922 | |
9141a4ca PB |
923 | err = 0; |
924 | ||
925 | out: | |
926 | kfree(names); | |
927 | kfree(callbacks); | |
928 | kfree(vqs); | |
929 | if (err) | |
930 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 931 | return err; |
4fe74b1c PB |
932 | } |
933 | ||
6f039790 | 934 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
935 | { |
936 | struct Scsi_Host *shost; | |
937 | struct virtio_scsi *vscsi; | |
e6dc783a | 938 | int err, host_prot; |
2bd37f0f | 939 | u32 sg_elems, num_targets; |
4fe74b1c | 940 | u32 cmd_per_lun; |
9141a4ca PB |
941 | u32 num_queues; |
942 | struct scsi_host_template *hostt; | |
943 | ||
944 | /* We need to know how many queues before we allocate. */ | |
945 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
4fe74b1c | 946 | |
2bd37f0f | 947 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 948 | |
9141a4ca PB |
949 | if (num_queues == 1) |
950 | hostt = &virtscsi_host_template_single; | |
951 | else | |
952 | hostt = &virtscsi_host_template_multi; | |
953 | ||
954 | shost = scsi_host_alloc(hostt, | |
955 | sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues); | |
4fe74b1c PB |
956 | if (!shost) |
957 | return -ENOMEM; | |
958 | ||
2bd37f0f | 959 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
960 | shost->sg_tablesize = sg_elems; |
961 | vscsi = shost_priv(shost); | |
962 | vscsi->vdev = vdev; | |
9141a4ca | 963 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
964 | vdev->priv = shost; |
965 | ||
5c370194 | 966 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
967 | if (err) |
968 | goto virtscsi_init_failed; | |
969 | ||
285e71ea WG |
970 | vscsi->nb.notifier_call = &virtscsi_cpu_callback; |
971 | err = register_hotcpu_notifier(&vscsi->nb); | |
972 | if (err) { | |
973 | pr_err("registering cpu notifier failed\n"); | |
974 | goto scsi_add_host_failed; | |
975 | } | |
976 | ||
4fe74b1c PB |
977 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
978 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
979 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
980 | |
981 | /* LUNs > 256 are reported with format 1, so they go in the range | |
982 | * 16640-32767. | |
983 | */ | |
984 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 985 | shost->max_id = num_targets; |
4fe74b1c PB |
986 | shost->max_channel = 0; |
987 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
e6dc783a NB |
988 | |
989 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) { | |
990 | host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | | |
991 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | | |
992 | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; | |
993 | ||
994 | scsi_host_set_prot(shost, host_prot); | |
995 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
996 | } | |
997 | ||
4fe74b1c PB |
998 | err = scsi_add_host(shost, &vdev->dev); |
999 | if (err) | |
1000 | goto scsi_add_host_failed; | |
59057fbc NB |
1001 | /* |
1002 | * scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan() | |
1003 | * after VIRTIO_CONFIG_S_DRIVER_OK has been set.. | |
1004 | */ | |
4fe74b1c PB |
1005 | return 0; |
1006 | ||
1007 | scsi_add_host_failed: | |
1008 | vdev->config->del_vqs(vdev); | |
1009 | virtscsi_init_failed: | |
1010 | scsi_host_put(shost); | |
1011 | return err; | |
1012 | } | |
1013 | ||
6f039790 | 1014 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
1015 | { |
1016 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
1017 | struct virtio_scsi *vscsi = shost_priv(shost); |
1018 | ||
1019 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
1020 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
1021 | |
1022 | scsi_remove_host(shost); | |
1023 | ||
285e71ea WG |
1024 | unregister_hotcpu_notifier(&vscsi->nb); |
1025 | ||
4fe74b1c PB |
1026 | virtscsi_remove_vqs(vdev); |
1027 | scsi_host_put(shost); | |
1028 | } | |
1029 | ||
89107000 | 1030 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1031 | static int virtscsi_freeze(struct virtio_device *vdev) |
1032 | { | |
f466f753 AH |
1033 | struct Scsi_Host *sh = virtio_scsi_host(vdev); |
1034 | struct virtio_scsi *vscsi = shost_priv(sh); | |
1035 | ||
1036 | unregister_hotcpu_notifier(&vscsi->nb); | |
4fe74b1c PB |
1037 | virtscsi_remove_vqs(vdev); |
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | static int virtscsi_restore(struct virtio_device *vdev) | |
1042 | { | |
1043 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
1044 | struct virtio_scsi *vscsi = shost_priv(sh); | |
f466f753 AH |
1045 | int err; |
1046 | ||
1047 | err = virtscsi_init(vdev, vscsi); | |
1048 | if (err) | |
1049 | return err; | |
1050 | ||
1051 | err = register_hotcpu_notifier(&vscsi->nb); | |
cd679048 | 1052 | if (err) { |
f466f753 | 1053 | vdev->config->del_vqs(vdev); |
cd679048 MT |
1054 | return err; |
1055 | } | |
1056 | ||
1057 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
1058 | virtscsi_kick_event_all(vscsi); | |
4fe74b1c | 1059 | |
f466f753 | 1060 | return err; |
4fe74b1c PB |
1061 | } |
1062 | #endif | |
1063 | ||
1064 | static struct virtio_device_id id_table[] = { | |
1065 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
1066 | { 0 }, | |
1067 | }; | |
1068 | ||
365a7150 | 1069 | static unsigned int features[] = { |
865b58c0 PB |
1070 | VIRTIO_SCSI_F_HOTPLUG, |
1071 | VIRTIO_SCSI_F_CHANGE, | |
e6dc783a | 1072 | VIRTIO_SCSI_F_T10_PI, |
365a7150 CM |
1073 | }; |
1074 | ||
4fe74b1c | 1075 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
1076 | .feature_table = features, |
1077 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
1078 | .driver.name = KBUILD_MODNAME, |
1079 | .driver.owner = THIS_MODULE, | |
1080 | .id_table = id_table, | |
1081 | .probe = virtscsi_probe, | |
59057fbc | 1082 | .scan = virtscsi_scan, |
89107000 | 1083 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1084 | .freeze = virtscsi_freeze, |
1085 | .restore = virtscsi_restore, | |
1086 | #endif | |
6f039790 | 1087 | .remove = virtscsi_remove, |
4fe74b1c PB |
1088 | }; |
1089 | ||
1090 | static int __init init(void) | |
1091 | { | |
1092 | int ret = -ENOMEM; | |
1093 | ||
1094 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
1095 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 1096 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
1097 | goto error; |
1098 | } | |
1099 | ||
1100 | ||
1101 | virtscsi_cmd_pool = | |
1102 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
1103 | virtscsi_cmd_cache); | |
1104 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 1105 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
1106 | goto error; |
1107 | } | |
1108 | ret = register_virtio_driver(&virtio_scsi_driver); | |
1109 | if (ret < 0) | |
1110 | goto error; | |
1111 | ||
1112 | return 0; | |
1113 | ||
1114 | error: | |
1115 | if (virtscsi_cmd_pool) { | |
1116 | mempool_destroy(virtscsi_cmd_pool); | |
1117 | virtscsi_cmd_pool = NULL; | |
1118 | } | |
1119 | if (virtscsi_cmd_cache) { | |
1120 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1121 | virtscsi_cmd_cache = NULL; | |
1122 | } | |
1123 | return ret; | |
1124 | } | |
1125 | ||
1126 | static void __exit fini(void) | |
1127 | { | |
1128 | unregister_virtio_driver(&virtio_scsi_driver); | |
1129 | mempool_destroy(virtscsi_cmd_pool); | |
1130 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1131 | } | |
1132 | module_init(init); | |
1133 | module_exit(fini); | |
1134 | ||
1135 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1136 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
1137 | MODULE_LICENSE("GPL"); |