Commit | Line | Data |
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f33f5fe2 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
4fe74b1c PB |
2 | /* |
3 | * Virtio SCSI HBA driver | |
4 | * | |
5 | * Copyright IBM Corp. 2010 | |
6 | * Copyright Red Hat, Inc. 2011 | |
7 | * | |
8 | * Authors: | |
9 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | |
10 | * Paolo Bonzini <pbonzini@redhat.com> | |
4fe74b1c PB |
11 | */ |
12 | ||
ba06d1e1 WG |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
4fe74b1c PB |
15 | #include <linux/module.h> |
16 | #include <linux/slab.h> | |
17 | #include <linux/mempool.h> | |
0d9f0a52 | 18 | #include <linux/interrupt.h> |
4fe74b1c PB |
19 | #include <linux/virtio.h> |
20 | #include <linux/virtio_ids.h> | |
21 | #include <linux/virtio_config.h> | |
22 | #include <linux/virtio_scsi.h> | |
9141a4ca | 23 | #include <linux/cpu.h> |
e6dc783a | 24 | #include <linux/blkdev.h> |
fe45e630 | 25 | #include <linux/blk-integrity.h> |
4fe74b1c PB |
26 | #include <scsi/scsi_host.h> |
27 | #include <scsi/scsi_device.h> | |
28 | #include <scsi/scsi_cmnd.h> | |
761f1193 | 29 | #include <scsi/scsi_tcq.h> |
25d1d50e | 30 | #include <scsi/scsi_devinfo.h> |
938ece71 | 31 | #include <linux/seqlock.h> |
0d9f0a52 | 32 | #include <linux/blk-mq-virtio.h> |
4fe74b1c | 33 | |
5ff84372 ML |
34 | #include "sd.h" |
35 | ||
4fe74b1c | 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 | ||
4fe74b1c PB |
71 | /* Driver instance state */ |
72 | struct virtio_scsi { | |
4fe74b1c | 73 | struct virtio_device *vdev; |
2bd37f0f | 74 | |
365a7150 CM |
75 | /* Get some buffers ready for event vq */ |
76 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
9141a4ca PB |
77 | |
78 | u32 num_queues; | |
79 | ||
8904f5a5 | 80 | struct hlist_node node; |
285e71ea | 81 | |
e67423c7 MT |
82 | /* Protected by event_vq lock */ |
83 | bool stop_events; | |
84 | ||
9141a4ca PB |
85 | struct virtio_scsi_vq ctrl_vq; |
86 | struct virtio_scsi_vq event_vq; | |
87 | struct virtio_scsi_vq req_vqs[]; | |
4fe74b1c PB |
88 | }; |
89 | ||
90 | static struct kmem_cache *virtscsi_cmd_cache; | |
91 | static mempool_t *virtscsi_cmd_pool; | |
92 | ||
93 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
94 | { | |
95 | return vdev->priv; | |
96 | } | |
97 | ||
98 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
99 | { | |
ae3d56d8 | 100 | if (resid) |
5f638e5a | 101 | scsi_set_resid(sc, min(resid, scsi_bufflen(sc))); |
4fe74b1c PB |
102 | } |
103 | ||
e31f2661 | 104 | /* |
4fe74b1c PB |
105 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done |
106 | * | |
107 | * Called with vq_lock held. | |
108 | */ | |
7f82b3c9 | 109 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
110 | { |
111 | struct virtio_scsi_cmd *cmd = buf; | |
112 | struct scsi_cmnd *sc = cmd->sc; | |
113 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
114 | ||
115 | dev_dbg(&sc->device->sdev_gendev, | |
116 | "cmd %p response %u status %#02x sense_len %u\n", | |
117 | sc, resp->response, resp->status, resp->sense_len); | |
118 | ||
119 | sc->result = resp->status; | |
d75dff39 | 120 | virtscsi_compute_resid(sc, virtio32_to_cpu(vscsi->vdev, resp->resid)); |
4fe74b1c PB |
121 | switch (resp->response) { |
122 | case VIRTIO_SCSI_S_OK: | |
123 | set_host_byte(sc, DID_OK); | |
124 | break; | |
125 | case VIRTIO_SCSI_S_OVERRUN: | |
126 | set_host_byte(sc, DID_ERROR); | |
127 | break; | |
128 | case VIRTIO_SCSI_S_ABORTED: | |
129 | set_host_byte(sc, DID_ABORT); | |
130 | break; | |
131 | case VIRTIO_SCSI_S_BAD_TARGET: | |
132 | set_host_byte(sc, DID_BAD_TARGET); | |
133 | break; | |
134 | case VIRTIO_SCSI_S_RESET: | |
135 | set_host_byte(sc, DID_RESET); | |
136 | break; | |
137 | case VIRTIO_SCSI_S_BUSY: | |
138 | set_host_byte(sc, DID_BUS_BUSY); | |
139 | break; | |
140 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
141 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
142 | break; | |
143 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
beb4dac8 | 144 | set_host_byte(sc, DID_BAD_TARGET); |
4fe74b1c PB |
145 | break; |
146 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
377a7b0b | 147 | set_status_byte(sc, SAM_STAT_RESERVATION_CONFLICT); |
4fe74b1c PB |
148 | break; |
149 | default: | |
150 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
151 | resp->response); | |
df561f66 | 152 | fallthrough; |
4fe74b1c PB |
153 | case VIRTIO_SCSI_S_FAILURE: |
154 | set_host_byte(sc, DID_ERROR); | |
155 | break; | |
156 | } | |
157 | ||
d75dff39 MT |
158 | WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) > |
159 | VIRTIO_SCSI_SENSE_SIZE); | |
c43ddbf9 | 160 | if (resp->sense_len) { |
4fe74b1c | 161 | memcpy(sc->sense_buffer, resp->sense, |
d75dff39 MT |
162 | min_t(u32, |
163 | virtio32_to_cpu(vscsi->vdev, resp->sense_len), | |
164 | VIRTIO_SCSI_SENSE_SIZE)); | |
4fe74b1c PB |
165 | } |
166 | ||
b4194fcb | 167 | scsi_done(sc); |
4fe74b1c PB |
168 | } |
169 | ||
10f34f64 PB |
170 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
171 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 172 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 173 | { |
4fe74b1c | 174 | void *buf; |
4fe74b1c | 175 | unsigned int len; |
10f34f64 PB |
176 | unsigned long flags; |
177 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 178 | |
10f34f64 | 179 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
180 | do { |
181 | virtqueue_disable_cb(vq); | |
182 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 183 | fn(vscsi, buf); |
2bf4fd31 HG |
184 | |
185 | if (unlikely(virtqueue_is_broken(vq))) | |
186 | break; | |
4fe74b1c | 187 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 188 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
189 | } |
190 | ||
191 | static void virtscsi_req_done(struct virtqueue *vq) | |
192 | { | |
139fe45a PB |
193 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
194 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
195 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
196 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
197 | ||
9141a4ca | 198 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); |
4fe74b1c PB |
199 | }; |
200 | ||
8faeb529 PB |
201 | static void virtscsi_poll_requests(struct virtio_scsi *vscsi) |
202 | { | |
203 | int i, num_vqs; | |
204 | ||
205 | num_vqs = vscsi->num_queues; | |
206 | for (i = 0; i < num_vqs; i++) | |
207 | virtscsi_vq_done(vscsi, &vscsi->req_vqs[i], | |
208 | virtscsi_complete_cmd); | |
209 | } | |
210 | ||
7f82b3c9 | 211 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
212 | { |
213 | struct virtio_scsi_cmd *cmd = buf; | |
214 | ||
215 | if (cmd->comp) | |
e8f81420 | 216 | complete(cmd->comp); |
4fe74b1c PB |
217 | } |
218 | ||
219 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
220 | { | |
139fe45a PB |
221 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
222 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 223 | |
10f34f64 | 224 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
225 | }; |
226 | ||
cdda0e5a PB |
227 | static void virtscsi_handle_event(struct work_struct *work); |
228 | ||
365a7150 CM |
229 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
230 | struct virtio_scsi_event_node *event_node) | |
231 | { | |
4614e51c | 232 | int err; |
365a7150 CM |
233 | struct scatterlist sg; |
234 | unsigned long flags; | |
235 | ||
cdda0e5a | 236 | INIT_WORK(&event_node->work, virtscsi_handle_event); |
2e9c9dfd | 237 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
238 | |
239 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
240 | ||
bf958291 RR |
241 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
242 | GFP_ATOMIC); | |
4614e51c | 243 | if (!err) |
365a7150 CM |
244 | virtqueue_kick(vscsi->event_vq.vq); |
245 | ||
246 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
247 | ||
4614e51c | 248 | return err; |
365a7150 CM |
249 | } |
250 | ||
251 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
252 | { | |
253 | int i; | |
254 | ||
255 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
256 | vscsi->event_list[i].vscsi = vscsi; | |
257 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
258 | } | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
264 | { | |
265 | int i; | |
266 | ||
e67423c7 MT |
267 | /* Stop scheduling work before calling cancel_work_sync. */ |
268 | spin_lock_irq(&vscsi->event_vq.vq_lock); | |
269 | vscsi->stop_events = true; | |
270 | spin_unlock_irq(&vscsi->event_vq.vq_lock); | |
271 | ||
365a7150 CM |
272 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) |
273 | cancel_work_sync(&vscsi->event_list[i].work); | |
274 | } | |
275 | ||
276 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 277 | struct virtio_scsi_event *event) |
365a7150 CM |
278 | { |
279 | struct scsi_device *sdev; | |
280 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
281 | unsigned int target = event->lun[1]; | |
282 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
283 | ||
d75dff39 | 284 | switch (virtio32_to_cpu(vscsi->vdev, event->reason)) { |
365a7150 | 285 | case VIRTIO_SCSI_EVT_RESET_RESCAN: |
beef6fd0 MG |
286 | if (lun == 0) { |
287 | scsi_scan_target(&shost->shost_gendev, 0, target, | |
288 | SCAN_WILD_CARD, SCSI_SCAN_INITIAL); | |
289 | } else { | |
290 | scsi_add_device(shost, 0, target, lun); | |
291 | } | |
365a7150 CM |
292 | break; |
293 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
294 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
295 | if (sdev) { | |
296 | scsi_remove_device(sdev); | |
297 | scsi_device_put(sdev); | |
298 | } else { | |
299 | pr_err("SCSI device %d 0 %d %d not found\n", | |
300 | shost->host_no, target, lun); | |
301 | } | |
302 | break; | |
303 | default: | |
cced4c0e | 304 | pr_info("Unsupported virtio scsi event reason %x\n", event->reason); |
365a7150 CM |
305 | } |
306 | } | |
307 | ||
865b58c0 PB |
308 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
309 | struct virtio_scsi_event *event) | |
310 | { | |
311 | struct scsi_device *sdev; | |
312 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
313 | unsigned int target = event->lun[1]; | |
314 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
d75dff39 MT |
315 | u8 asc = virtio32_to_cpu(vscsi->vdev, event->reason) & 255; |
316 | u8 ascq = virtio32_to_cpu(vscsi->vdev, event->reason) >> 8; | |
865b58c0 PB |
317 | |
318 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
319 | if (!sdev) { | |
320 | pr_err("SCSI device %d 0 %d %d not found\n", | |
321 | shost->host_no, target, lun); | |
322 | return; | |
323 | } | |
324 | ||
325 | /* Handle "Parameters changed", "Mode parameters changed", and | |
326 | "Capacity data has changed". */ | |
327 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
328 | scsi_rescan_device(&sdev->sdev_gendev); | |
329 | ||
330 | scsi_device_put(sdev); | |
331 | } | |
332 | ||
08707b5c | 333 | static int virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi) |
5ff84372 ML |
334 | { |
335 | struct scsi_device *sdev; | |
336 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
337 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
338 | int result, inquiry_len, inq_result_len = 256; | |
339 | char *inq_result = kmalloc(inq_result_len, GFP_KERNEL); | |
340 | ||
0e5e41ee | 341 | if (!inq_result) |
08707b5c | 342 | return -ENOMEM; |
08707b5c | 343 | |
5ff84372 ML |
344 | shost_for_each_device(sdev, shost) { |
345 | inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
346 | ||
347 | memset(scsi_cmd, 0, sizeof(scsi_cmd)); | |
348 | scsi_cmd[0] = INQUIRY; | |
349 | scsi_cmd[4] = (unsigned char) inquiry_len; | |
350 | ||
351 | memset(inq_result, 0, inq_result_len); | |
352 | ||
5314ce76 MC |
353 | result = scsi_execute_cmd(sdev, scsi_cmd, REQ_OP_DRV_IN, |
354 | inq_result, inquiry_len, | |
5ff84372 ML |
355 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
356 | ||
357 | if (result == 0 && inq_result[0] >> 5) { | |
358 | /* PQ indicates the LUN is not attached */ | |
359 | scsi_remove_device(sdev); | |
ced202f7 | 360 | } else if (result > 0 && host_byte(result) == DID_BAD_TARGET) { |
bb2e3314 ML |
361 | /* |
362 | * If all LUNs of a virtio-scsi device are unplugged | |
363 | * it will respond with BAD TARGET on any INQUIRY | |
364 | * command. | |
365 | * Remove the device in this case as well. | |
366 | */ | |
367 | scsi_remove_device(sdev); | |
5ff84372 ML |
368 | } |
369 | } | |
370 | ||
371 | kfree(inq_result); | |
08707b5c | 372 | return 0; |
5ff84372 ML |
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)) { | |
08707b5c ZW |
384 | int ret; |
385 | ||
d75dff39 MT |
386 | event->event &= ~cpu_to_virtio32(vscsi->vdev, |
387 | VIRTIO_SCSI_T_EVENTS_MISSED); | |
08707b5c ZW |
388 | ret = virtscsi_rescan_hotunplug(vscsi); |
389 | if (ret) | |
390 | return; | |
365a7150 CM |
391 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); |
392 | } | |
393 | ||
d75dff39 | 394 | switch (virtio32_to_cpu(vscsi->vdev, event->event)) { |
365a7150 CM |
395 | case VIRTIO_SCSI_T_NO_EVENT: |
396 | break; | |
397 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
398 | virtscsi_handle_transport_reset(vscsi, event); | |
399 | break; | |
865b58c0 PB |
400 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
401 | virtscsi_handle_param_change(vscsi, event); | |
402 | break; | |
365a7150 | 403 | default: |
cced4c0e | 404 | pr_err("Unsupported virtio scsi event %x\n", event->event); |
365a7150 CM |
405 | } |
406 | virtscsi_kick_event(vscsi, event_node); | |
407 | } | |
408 | ||
7f82b3c9 | 409 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
410 | { |
411 | struct virtio_scsi_event_node *event_node = buf; | |
412 | ||
e67423c7 MT |
413 | if (!vscsi->stop_events) |
414 | queue_work(system_freezable_wq, &event_node->work); | |
365a7150 CM |
415 | } |
416 | ||
4fe74b1c PB |
417 | static void virtscsi_event_done(struct virtqueue *vq) |
418 | { | |
139fe45a PB |
419 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
420 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 421 | |
10f34f64 | 422 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
423 | }; |
424 | ||
9e5470fe | 425 | static int __virtscsi_add_cmd(struct virtqueue *vq, |
682993b4 | 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) | |
ae3d56d8 | 438 | out = &sc->sdb.table; |
682993b4 | 439 | if (sc->sc_data_direction != DMA_TO_DEVICE) |
ae3d56d8 | 440 | in = &sc->sdb.table; |
682993b4 | 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 | ||
9e5470fe PB |
470 | static void virtscsi_kick_vq(struct virtio_scsi_vq *vq) |
471 | { | |
472 | bool needs_kick; | |
473 | unsigned long flags; | |
474 | ||
475 | spin_lock_irqsave(&vq->vq_lock, flags); | |
476 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
477 | spin_unlock_irqrestore(&vq->vq_lock, flags); | |
478 | ||
479 | if (needs_kick) | |
480 | virtqueue_notify(vq->vq); | |
481 | } | |
482 | ||
483 | /** | |
484 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue, optionally kick it | |
485 | * @vq : the struct virtqueue we're talking about | |
486 | * @cmd : command structure | |
487 | * @req_size : size of the request buffer | |
488 | * @resp_size : size of the response buffer | |
489 | * @kick : whether to kick the virtqueue immediately | |
490 | */ | |
491 | static int virtscsi_add_cmd(struct virtio_scsi_vq *vq, | |
4fe74b1c | 492 | struct virtio_scsi_cmd *cmd, |
9e5470fe PB |
493 | size_t req_size, size_t resp_size, |
494 | bool kick) | |
4fe74b1c | 495 | { |
4fe74b1c | 496 | unsigned long flags; |
4614e51c RR |
497 | int err; |
498 | bool needs_kick = false; | |
4fe74b1c | 499 | |
682993b4 | 500 | spin_lock_irqsave(&vq->vq_lock, flags); |
9e5470fe PB |
501 | err = __virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size); |
502 | if (!err && kick) | |
4614e51c | 503 | needs_kick = virtqueue_kick_prepare(vq->vq); |
139fe45a | 504 | |
bce750b1 | 505 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 506 | |
4614e51c | 507 | if (needs_kick) |
139fe45a | 508 | virtqueue_notify(vq->vq); |
4614e51c | 509 | return err; |
4fe74b1c PB |
510 | } |
511 | ||
d75dff39 MT |
512 | static void virtio_scsi_init_hdr(struct virtio_device *vdev, |
513 | struct virtio_scsi_cmd_req *cmd, | |
e6dc783a NB |
514 | struct scsi_cmnd *sc) |
515 | { | |
516 | cmd->lun[0] = 1; | |
517 | cmd->lun[1] = sc->device->id; | |
518 | cmd->lun[2] = (sc->device->lun >> 8) | 0x40; | |
519 | cmd->lun[3] = sc->device->lun & 0xff; | |
d75dff39 | 520 | cmd->tag = cpu_to_virtio64(vdev, (unsigned long)sc); |
e6dc783a NB |
521 | cmd->task_attr = VIRTIO_SCSI_S_SIMPLE; |
522 | cmd->prio = 0; | |
523 | cmd->crn = 0; | |
524 | } | |
525 | ||
c5c2567f | 526 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
d75dff39 MT |
527 | static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev, |
528 | struct virtio_scsi_cmd_req_pi *cmd_pi, | |
e6dc783a NB |
529 | struct scsi_cmnd *sc) |
530 | { | |
7cc4554e | 531 | struct request *rq = scsi_cmd_to_rq(sc); |
e6dc783a NB |
532 | struct blk_integrity *bi; |
533 | ||
d75dff39 | 534 | virtio_scsi_init_hdr(vdev, (struct virtio_scsi_cmd_req *)cmd_pi, sc); |
e6dc783a NB |
535 | |
536 | if (!rq || !scsi_prot_sg_count(sc)) | |
537 | return; | |
538 | ||
f3fa33ac | 539 | bi = blk_get_integrity(rq->q->disk); |
e6dc783a NB |
540 | |
541 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
d75dff39 | 542 | cmd_pi->pi_bytesout = cpu_to_virtio32(vdev, |
cdcdcaae GE |
543 | bio_integrity_bytes(bi, |
544 | blk_rq_sectors(rq))); | |
e6dc783a | 545 | else if (sc->sc_data_direction == DMA_FROM_DEVICE) |
d75dff39 | 546 | cmd_pi->pi_bytesin = cpu_to_virtio32(vdev, |
cdcdcaae GE |
547 | bio_integrity_bytes(bi, |
548 | blk_rq_sectors(rq))); | |
e6dc783a | 549 | } |
c5c2567f | 550 | #endif |
e6dc783a | 551 | |
c3506df8 ML |
552 | static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi, |
553 | struct scsi_cmnd *sc) | |
554 | { | |
7cc4554e | 555 | u32 tag = blk_mq_unique_tag(scsi_cmd_to_rq(sc)); |
c3506df8 ML |
556 | u16 hwq = blk_mq_unique_tag_to_hwq(tag); |
557 | ||
558 | return &vscsi->req_vqs[hwq]; | |
559 | } | |
560 | ||
561 | static int virtscsi_queuecommand(struct Scsi_Host *shost, | |
9141a4ca | 562 | struct scsi_cmnd *sc) |
4fe74b1c | 563 | { |
c3506df8 ML |
564 | struct virtio_scsi *vscsi = shost_priv(shost); |
565 | struct virtio_scsi_vq *req_vq = virtscsi_pick_vq_mq(vscsi, sc); | |
b54197c4 | 566 | struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc); |
9e5470fe | 567 | bool kick; |
773c7220 | 568 | unsigned long flags; |
ed9ea4ed | 569 | int req_size; |
773c7220 | 570 | int ret; |
b54197c4 | 571 | |
2bd37f0f PB |
572 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
573 | ||
574 | /* TODO: check feature bit and fail if unsupported? */ | |
575 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
576 | ||
4fe74b1c PB |
577 | dev_dbg(&sc->device->sdev_gendev, |
578 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
579 | ||
4fe74b1c | 580 | cmd->sc = sc; |
4fe74b1c PB |
581 | |
582 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
4fe74b1c | 583 | |
c5c2567f | 584 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 585 | if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) { |
d75dff39 | 586 | virtio_scsi_init_hdr_pi(vscsi->vdev, &cmd->req.cmd_pi, sc); |
e6dc783a NB |
587 | memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len); |
588 | req_size = sizeof(cmd->req.cmd_pi); | |
c5c2567f CH |
589 | } else |
590 | #endif | |
591 | { | |
d75dff39 | 592 | virtio_scsi_init_hdr(vscsi->vdev, &cmd->req.cmd, sc); |
e6dc783a NB |
593 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); |
594 | req_size = sizeof(cmd->req.cmd); | |
595 | } | |
596 | ||
9e5470fe PB |
597 | kick = (sc->flags & SCMD_LAST) != 0; |
598 | ret = virtscsi_add_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd), kick); | |
773c7220 EF |
599 | if (ret == -EIO) { |
600 | cmd->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; | |
601 | spin_lock_irqsave(&req_vq->vq_lock, flags); | |
602 | virtscsi_complete_cmd(vscsi, cmd); | |
603 | spin_unlock_irqrestore(&req_vq->vq_lock, flags); | |
604 | } else if (ret != 0) { | |
b54197c4 | 605 | return SCSI_MLQUEUE_HOST_BUSY; |
773c7220 | 606 | } |
b54197c4 | 607 | return 0; |
4fe74b1c PB |
608 | } |
609 | ||
610 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) | |
611 | { | |
612 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 613 | int ret = FAILED; |
4fe74b1c PB |
614 | |
615 | cmd->comp = ∁ | |
9e5470fe PB |
616 | if (virtscsi_add_cmd(&vscsi->ctrl_vq, cmd, |
617 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf, true) < 0) | |
e4594bb5 | 618 | goto out; |
4fe74b1c PB |
619 | |
620 | wait_for_completion(&comp); | |
e4594bb5 PB |
621 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
622 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
623 | ret = SUCCESS; | |
4fe74b1c | 624 | |
8faeb529 PB |
625 | /* |
626 | * The spec guarantees that all requests related to the TMF have | |
627 | * been completed, but the callback might not have run yet if | |
628 | * we're using independent interrupts (e.g. MSI). Poll the | |
629 | * virtqueues once. | |
630 | * | |
b4194fcb BVA |
631 | * In the abort case, scsi_done() will do nothing, because the |
632 | * command timed out and hence SCMD_STATE_COMPLETE has been set. | |
8faeb529 PB |
633 | */ |
634 | virtscsi_poll_requests(vscsi); | |
635 | ||
e4594bb5 PB |
636 | out: |
637 | mempool_free(cmd, virtscsi_cmd_pool); | |
638 | return ret; | |
4fe74b1c PB |
639 | } |
640 | ||
641 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
642 | { | |
643 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
644 | struct virtio_scsi_cmd *cmd; | |
645 | ||
646 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
647 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
648 | if (!cmd) | |
649 | return FAILED; | |
650 | ||
651 | memset(cmd, 0, sizeof(*cmd)); | |
4fe74b1c PB |
652 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
653 | .type = VIRTIO_SCSI_T_TMF, | |
d75dff39 MT |
654 | .subtype = cpu_to_virtio32(vscsi->vdev, |
655 | VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET), | |
4fe74b1c PB |
656 | .lun[0] = 1, |
657 | .lun[1] = sc->device->id, | |
658 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
659 | .lun[3] = sc->device->lun & 0xff, | |
660 | }; | |
661 | return virtscsi_tmf(vscsi, cmd); | |
662 | } | |
663 | ||
25d1d50e DG |
664 | static int virtscsi_device_alloc(struct scsi_device *sdevice) |
665 | { | |
666 | /* | |
667 | * Passed through SCSI targets (e.g. with qemu's 'scsi-block') | |
668 | * may have transfer limits which come from the host SCSI | |
669 | * controller or something on the host side other than the | |
670 | * target itself. | |
671 | * | |
672 | * To make this work properly, the hypervisor can adjust the | |
673 | * target's VPD information to advertise these limits. But | |
674 | * for that to work, the guest has to look at the VPD pages, | |
675 | * which we won't do by default if it is an SPC-2 device, even | |
676 | * if it does actually support it. | |
677 | * | |
678 | * So, set the blist to always try to read the VPD pages. | |
679 | */ | |
680 | sdevice->sdev_bflags = BLIST_TRY_VPD_PAGES; | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
685 | ||
761f1193 VS |
686 | /** |
687 | * virtscsi_change_queue_depth() - Change a virtscsi target's queue depth | |
688 | * @sdev: Virtscsi target whose queue depth to change | |
689 | * @qdepth: New queue depth | |
761f1193 | 690 | */ |
db5ed4df | 691 | static int virtscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
761f1193 VS |
692 | { |
693 | struct Scsi_Host *shost = sdev->host; | |
694 | int max_depth = shost->cmd_per_lun; | |
695 | ||
db5ed4df | 696 | return scsi_change_queue_depth(sdev, min(max_depth, qdepth)); |
761f1193 VS |
697 | } |
698 | ||
4fe74b1c PB |
699 | static int virtscsi_abort(struct scsi_cmnd *sc) |
700 | { | |
701 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
702 | struct virtio_scsi_cmd *cmd; | |
703 | ||
704 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
705 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
706 | if (!cmd) | |
707 | return FAILED; | |
708 | ||
709 | memset(cmd, 0, sizeof(*cmd)); | |
4fe74b1c PB |
710 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
711 | .type = VIRTIO_SCSI_T_TMF, | |
712 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
713 | .lun[0] = 1, | |
714 | .lun[1] = sc->device->id, | |
715 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
716 | .lun[3] = sc->device->lun & 0xff, | |
d75dff39 | 717 | .tag = cpu_to_virtio64(vscsi->vdev, (unsigned long)sc), |
4fe74b1c PB |
718 | }; |
719 | return virtscsi_tmf(vscsi, cmd); | |
720 | } | |
721 | ||
a4e1d0b7 | 722 | static void virtscsi_map_queues(struct Scsi_Host *shost) |
0d9f0a52 CH |
723 | { |
724 | struct virtio_scsi *vscsi = shost_priv(shost); | |
6343e3ef | 725 | struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT]; |
0d9f0a52 | 726 | |
a4e1d0b7 | 727 | blk_mq_virtio_map_queues(qmap, vscsi->vdev, 2); |
0d9f0a52 CH |
728 | } |
729 | ||
9e5470fe PB |
730 | static void virtscsi_commit_rqs(struct Scsi_Host *shost, u16 hwq) |
731 | { | |
732 | struct virtio_scsi *vscsi = shost_priv(shost); | |
733 | ||
734 | virtscsi_kick_vq(&vscsi->req_vqs[hwq]); | |
735 | } | |
736 | ||
e72c9a2a PB |
737 | /* |
738 | * The host guarantees to respond to each command, although I/O | |
739 | * latencies might be higher than on bare metal. Reset the timer | |
740 | * unconditionally to give the host a chance to perform EH. | |
741 | */ | |
dee7121e | 742 | static enum scsi_timeout_action virtscsi_eh_timed_out(struct scsi_cmnd *scmnd) |
e72c9a2a | 743 | { |
dee7121e | 744 | return SCSI_EH_RESET_TIMER; |
e72c9a2a PB |
745 | } |
746 | ||
273ab251 | 747 | static const struct scsi_host_template virtscsi_host_template = { |
4fe74b1c PB |
748 | .module = THIS_MODULE, |
749 | .name = "Virtio SCSI HBA", | |
750 | .proc_name = "virtio_scsi", | |
4fe74b1c | 751 | .this_id = -1, |
b54197c4 | 752 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
c3506df8 | 753 | .queuecommand = virtscsi_queuecommand, |
9e5470fe | 754 | .commit_rqs = virtscsi_commit_rqs, |
761f1193 | 755 | .change_queue_depth = virtscsi_change_queue_depth, |
4fe74b1c PB |
756 | .eh_abort_handler = virtscsi_abort, |
757 | .eh_device_reset_handler = virtscsi_device_reset, | |
e72c9a2a | 758 | .eh_timed_out = virtscsi_eh_timed_out, |
a680f1d4 | 759 | .slave_alloc = virtscsi_device_alloc, |
4fe74b1c | 760 | |
4fe74b1c | 761 | .dma_boundary = UINT_MAX, |
0d9f0a52 | 762 | .map_queues = virtscsi_map_queues, |
c40ecc12 | 763 | .track_queue_depth = 1, |
4fe74b1c PB |
764 | }; |
765 | ||
766 | #define virtscsi_config_get(vdev, fld) \ | |
767 | ({ \ | |
965b5350 | 768 | __virtio_native_type(struct virtio_scsi_config, fld) __val; \ |
855e0c52 | 769 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
770 | __val; \ |
771 | }) | |
772 | ||
773 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 774 | do { \ |
965b5350 | 775 | __virtio_native_type(struct virtio_scsi_config, fld) __val = (val); \ |
855e0c52 RR |
776 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
777 | } while(0) | |
4fe74b1c | 778 | |
139fe45a PB |
779 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
780 | struct virtqueue *vq) | |
781 | { | |
782 | spin_lock_init(&virtscsi_vq->vq_lock); | |
783 | virtscsi_vq->vq = vq; | |
784 | } | |
785 | ||
2bd37f0f PB |
786 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
787 | { | |
2bd37f0f | 788 | /* Stop all the virtqueues. */ |
d9679d00 | 789 | virtio_reset_device(vdev); |
2bd37f0f PB |
790 | vdev->config->del_vqs(vdev); |
791 | } | |
792 | ||
4fe74b1c | 793 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 794 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
795 | { |
796 | int err; | |
9141a4ca PB |
797 | u32 i; |
798 | u32 num_vqs; | |
799 | vq_callback_t **callbacks; | |
800 | const char **names; | |
801 | struct virtqueue **vqs; | |
0d9f0a52 | 802 | struct irq_affinity desc = { .pre_vectors = 2 }; |
9141a4ca PB |
803 | |
804 | num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE; | |
6da2ec56 KC |
805 | vqs = kmalloc_array(num_vqs, sizeof(struct virtqueue *), GFP_KERNEL); |
806 | callbacks = kmalloc_array(num_vqs, sizeof(vq_callback_t *), | |
807 | GFP_KERNEL); | |
808 | names = kmalloc_array(num_vqs, sizeof(char *), GFP_KERNEL); | |
9141a4ca PB |
809 | |
810 | if (!callbacks || !vqs || !names) { | |
811 | err = -ENOMEM; | |
812 | goto out; | |
813 | } | |
2bd37f0f | 814 | |
9141a4ca PB |
815 | callbacks[0] = virtscsi_ctrl_done; |
816 | callbacks[1] = virtscsi_event_done; | |
817 | names[0] = "control"; | |
818 | names[1] = "event"; | |
819 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) { | |
820 | callbacks[i] = virtscsi_req_done; | |
821 | names[i] = "request"; | |
822 | } | |
4fe74b1c PB |
823 | |
824 | /* Discover virtqueues and write information to configuration. */ | |
9b2bbdb2 | 825 | err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc); |
4fe74b1c | 826 | if (err) |
9141a4ca | 827 | goto out; |
4fe74b1c | 828 | |
139fe45a PB |
829 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
830 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
831 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
832 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
833 | vqs[i]); | |
834 | ||
4fe74b1c PB |
835 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); |
836 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 837 | |
9141a4ca PB |
838 | err = 0; |
839 | ||
840 | out: | |
841 | kfree(names); | |
842 | kfree(callbacks); | |
843 | kfree(vqs); | |
844 | if (err) | |
845 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 846 | return err; |
4fe74b1c PB |
847 | } |
848 | ||
6f039790 | 849 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
850 | { |
851 | struct Scsi_Host *shost; | |
852 | struct virtio_scsi *vscsi; | |
908a5544 | 853 | int err; |
2bd37f0f | 854 | u32 sg_elems, num_targets; |
4fe74b1c | 855 | u32 cmd_per_lun; |
9141a4ca | 856 | u32 num_queues; |
9141a4ca | 857 | |
8cab3cd6 MT |
858 | if (!vdev->config->get) { |
859 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
860 | __func__); | |
861 | return -EINVAL; | |
862 | } | |
863 | ||
9141a4ca PB |
864 | /* We need to know how many queues before we allocate. */ |
865 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
1978f30a | 866 | num_queues = min_t(unsigned int, nr_cpu_ids, num_queues); |
4fe74b1c | 867 | |
2bd37f0f | 868 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 869 | |
c3506df8 | 870 | shost = scsi_host_alloc(&virtscsi_host_template, |
211f70ff | 871 | struct_size(vscsi, req_vqs, num_queues)); |
4fe74b1c PB |
872 | if (!shost) |
873 | return -ENOMEM; | |
874 | ||
2bd37f0f | 875 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c PB |
876 | shost->sg_tablesize = sg_elems; |
877 | vscsi = shost_priv(shost); | |
878 | vscsi->vdev = vdev; | |
9141a4ca | 879 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
880 | vdev->priv = shost; |
881 | ||
5c370194 | 882 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
883 | if (err) |
884 | goto virtscsi_init_failed; | |
885 | ||
582b0ab2 RJ |
886 | shost->can_queue = virtqueue_get_vring_size(vscsi->req_vqs[0].vq); |
887 | ||
4fe74b1c PB |
888 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
889 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
890 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
891 | |
892 | /* LUNs > 256 are reported with format 1, so they go in the range | |
893 | * 16640-32767. | |
894 | */ | |
895 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 896 | shost->max_id = num_targets; |
4fe74b1c PB |
897 | shost->max_channel = 0; |
898 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
ccbedf11 | 899 | shost->nr_hw_queues = num_queues; |
e6dc783a | 900 | |
c5c2567f | 901 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 902 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) { |
908a5544 SR |
903 | int host_prot; |
904 | ||
e6dc783a NB |
905 | host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | |
906 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | | |
907 | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; | |
908 | ||
909 | scsi_host_set_prot(shost, host_prot); | |
910 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
911 | } | |
c5c2567f | 912 | #endif |
e6dc783a | 913 | |
4fe74b1c PB |
914 | err = scsi_add_host(shost, &vdev->dev); |
915 | if (err) | |
916 | goto scsi_add_host_failed; | |
5d8f16d0 MT |
917 | |
918 | virtio_device_ready(vdev); | |
919 | ||
920 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
921 | virtscsi_kick_event_all(vscsi); | |
922 | ||
923 | scsi_scan_host(shost); | |
4fe74b1c PB |
924 | return 0; |
925 | ||
926 | scsi_add_host_failed: | |
927 | vdev->config->del_vqs(vdev); | |
928 | virtscsi_init_failed: | |
929 | scsi_host_put(shost); | |
930 | return err; | |
931 | } | |
932 | ||
6f039790 | 933 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
934 | { |
935 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
936 | struct virtio_scsi *vscsi = shost_priv(shost); |
937 | ||
938 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
939 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
940 | |
941 | scsi_remove_host(shost); | |
4fe74b1c PB |
942 | virtscsi_remove_vqs(vdev); |
943 | scsi_host_put(shost); | |
944 | } | |
945 | ||
89107000 | 946 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
947 | static int virtscsi_freeze(struct virtio_device *vdev) |
948 | { | |
949 | virtscsi_remove_vqs(vdev); | |
950 | return 0; | |
951 | } | |
952 | ||
953 | static int virtscsi_restore(struct virtio_device *vdev) | |
954 | { | |
955 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
956 | struct virtio_scsi *vscsi = shost_priv(sh); | |
f466f753 AH |
957 | int err; |
958 | ||
959 | err = virtscsi_init(vdev, vscsi); | |
960 | if (err) | |
961 | return err; | |
962 | ||
52c9cf1a MT |
963 | virtio_device_ready(vdev); |
964 | ||
cd679048 MT |
965 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
966 | virtscsi_kick_event_all(vscsi); | |
4fe74b1c | 967 | |
f466f753 | 968 | return err; |
4fe74b1c PB |
969 | } |
970 | #endif | |
971 | ||
972 | static struct virtio_device_id id_table[] = { | |
973 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
974 | { 0 }, | |
975 | }; | |
976 | ||
365a7150 | 977 | static unsigned int features[] = { |
865b58c0 PB |
978 | VIRTIO_SCSI_F_HOTPLUG, |
979 | VIRTIO_SCSI_F_CHANGE, | |
c5c2567f | 980 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 981 | VIRTIO_SCSI_F_T10_PI, |
c5c2567f | 982 | #endif |
365a7150 CM |
983 | }; |
984 | ||
4fe74b1c | 985 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
986 | .feature_table = features, |
987 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c PB |
988 | .driver.name = KBUILD_MODNAME, |
989 | .driver.owner = THIS_MODULE, | |
990 | .id_table = id_table, | |
991 | .probe = virtscsi_probe, | |
89107000 | 992 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
993 | .freeze = virtscsi_freeze, |
994 | .restore = virtscsi_restore, | |
995 | #endif | |
6f039790 | 996 | .remove = virtscsi_remove, |
4fe74b1c PB |
997 | }; |
998 | ||
41b8c2a3 | 999 | static int __init virtio_scsi_init(void) |
4fe74b1c PB |
1000 | { |
1001 | int ret = -ENOMEM; | |
1002 | ||
1003 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
1004 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 1005 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
1006 | goto error; |
1007 | } | |
1008 | ||
1009 | ||
1010 | virtscsi_cmd_pool = | |
1011 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
1012 | virtscsi_cmd_cache); | |
1013 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 1014 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
1015 | goto error; |
1016 | } | |
1017 | ret = register_virtio_driver(&virtio_scsi_driver); | |
1018 | if (ret < 0) | |
1019 | goto error; | |
1020 | ||
1021 | return 0; | |
1022 | ||
1023 | error: | |
92e8d032 XT |
1024 | mempool_destroy(virtscsi_cmd_pool); |
1025 | virtscsi_cmd_pool = NULL; | |
1026 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1027 | virtscsi_cmd_cache = NULL; | |
4fe74b1c PB |
1028 | return ret; |
1029 | } | |
1030 | ||
41b8c2a3 | 1031 | static void __exit virtio_scsi_fini(void) |
4fe74b1c PB |
1032 | { |
1033 | unregister_virtio_driver(&virtio_scsi_driver); | |
1034 | mempool_destroy(virtscsi_cmd_pool); | |
1035 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1036 | } | |
41b8c2a3 RD |
1037 | module_init(virtio_scsi_init); |
1038 | module_exit(virtio_scsi_fini); | |
4fe74b1c PB |
1039 | |
1040 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1041 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
1042 | MODULE_LICENSE("GPL"); |