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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 | 39 | |
95e72496 MC |
40 | static unsigned int virtscsi_poll_queues; |
41 | module_param(virtscsi_poll_queues, uint, 0644); | |
42 | MODULE_PARM_DESC(virtscsi_poll_queues, | |
43 | "The number of dedicated virtqueues for polling I/O"); | |
44 | ||
4fe74b1c PB |
45 | /* Command queue element */ |
46 | struct virtio_scsi_cmd { | |
47 | struct scsi_cmnd *sc; | |
48 | struct completion *comp; | |
49 | union { | |
50 | struct virtio_scsi_cmd_req cmd; | |
e6dc783a | 51 | struct virtio_scsi_cmd_req_pi cmd_pi; |
4fe74b1c PB |
52 | struct virtio_scsi_ctrl_tmf_req tmf; |
53 | struct virtio_scsi_ctrl_an_req an; | |
54 | } req; | |
55 | union { | |
56 | struct virtio_scsi_cmd_resp cmd; | |
57 | struct virtio_scsi_ctrl_tmf_resp tmf; | |
58 | struct virtio_scsi_ctrl_an_resp an; | |
59 | struct virtio_scsi_event evt; | |
60 | } resp; | |
61 | } ____cacheline_aligned_in_smp; | |
62 | ||
365a7150 CM |
63 | struct virtio_scsi_event_node { |
64 | struct virtio_scsi *vscsi; | |
65 | struct virtio_scsi_event event; | |
66 | struct work_struct work; | |
67 | }; | |
68 | ||
139fe45a PB |
69 | struct virtio_scsi_vq { |
70 | /* Protects vq */ | |
71 | spinlock_t vq_lock; | |
72 | ||
73 | struct virtqueue *vq; | |
74 | }; | |
75 | ||
4fe74b1c PB |
76 | /* Driver instance state */ |
77 | struct virtio_scsi { | |
4fe74b1c | 78 | struct virtio_device *vdev; |
2bd37f0f | 79 | |
365a7150 CM |
80 | /* Get some buffers ready for event vq */ |
81 | struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN]; | |
9141a4ca PB |
82 | |
83 | u32 num_queues; | |
95e72496 | 84 | int io_queues[HCTX_MAX_TYPES]; |
9141a4ca | 85 | |
8904f5a5 | 86 | struct hlist_node node; |
285e71ea | 87 | |
e67423c7 MT |
88 | /* Protected by event_vq lock */ |
89 | bool stop_events; | |
90 | ||
9141a4ca PB |
91 | struct virtio_scsi_vq ctrl_vq; |
92 | struct virtio_scsi_vq event_vq; | |
93 | struct virtio_scsi_vq req_vqs[]; | |
4fe74b1c PB |
94 | }; |
95 | ||
96 | static struct kmem_cache *virtscsi_cmd_cache; | |
97 | static mempool_t *virtscsi_cmd_pool; | |
98 | ||
99 | static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev) | |
100 | { | |
101 | return vdev->priv; | |
102 | } | |
103 | ||
104 | static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid) | |
105 | { | |
ae3d56d8 | 106 | if (resid) |
5f638e5a | 107 | scsi_set_resid(sc, min(resid, scsi_bufflen(sc))); |
4fe74b1c PB |
108 | } |
109 | ||
e31f2661 | 110 | /* |
4fe74b1c PB |
111 | * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done |
112 | * | |
113 | * Called with vq_lock held. | |
114 | */ | |
7f82b3c9 | 115 | static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
116 | { |
117 | struct virtio_scsi_cmd *cmd = buf; | |
118 | struct scsi_cmnd *sc = cmd->sc; | |
119 | struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd; | |
120 | ||
121 | dev_dbg(&sc->device->sdev_gendev, | |
122 | "cmd %p response %u status %#02x sense_len %u\n", | |
123 | sc, resp->response, resp->status, resp->sense_len); | |
124 | ||
125 | sc->result = resp->status; | |
d75dff39 | 126 | virtscsi_compute_resid(sc, virtio32_to_cpu(vscsi->vdev, resp->resid)); |
4fe74b1c PB |
127 | switch (resp->response) { |
128 | case VIRTIO_SCSI_S_OK: | |
129 | set_host_byte(sc, DID_OK); | |
130 | break; | |
131 | case VIRTIO_SCSI_S_OVERRUN: | |
132 | set_host_byte(sc, DID_ERROR); | |
133 | break; | |
134 | case VIRTIO_SCSI_S_ABORTED: | |
135 | set_host_byte(sc, DID_ABORT); | |
136 | break; | |
137 | case VIRTIO_SCSI_S_BAD_TARGET: | |
138 | set_host_byte(sc, DID_BAD_TARGET); | |
139 | break; | |
140 | case VIRTIO_SCSI_S_RESET: | |
141 | set_host_byte(sc, DID_RESET); | |
142 | break; | |
143 | case VIRTIO_SCSI_S_BUSY: | |
144 | set_host_byte(sc, DID_BUS_BUSY); | |
145 | break; | |
146 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE: | |
147 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
148 | break; | |
149 | case VIRTIO_SCSI_S_TARGET_FAILURE: | |
beb4dac8 | 150 | set_host_byte(sc, DID_BAD_TARGET); |
4fe74b1c PB |
151 | break; |
152 | case VIRTIO_SCSI_S_NEXUS_FAILURE: | |
377a7b0b | 153 | set_status_byte(sc, SAM_STAT_RESERVATION_CONFLICT); |
4fe74b1c PB |
154 | break; |
155 | default: | |
156 | scmd_printk(KERN_WARNING, sc, "Unknown response %d", | |
157 | resp->response); | |
df561f66 | 158 | fallthrough; |
4fe74b1c PB |
159 | case VIRTIO_SCSI_S_FAILURE: |
160 | set_host_byte(sc, DID_ERROR); | |
161 | break; | |
162 | } | |
163 | ||
d75dff39 MT |
164 | WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) > |
165 | VIRTIO_SCSI_SENSE_SIZE); | |
c43ddbf9 | 166 | if (resp->sense_len) { |
4fe74b1c | 167 | memcpy(sc->sense_buffer, resp->sense, |
d75dff39 MT |
168 | min_t(u32, |
169 | virtio32_to_cpu(vscsi->vdev, resp->sense_len), | |
170 | VIRTIO_SCSI_SENSE_SIZE)); | |
4fe74b1c PB |
171 | } |
172 | ||
b4194fcb | 173 | scsi_done(sc); |
4fe74b1c PB |
174 | } |
175 | ||
10f34f64 PB |
176 | static void virtscsi_vq_done(struct virtio_scsi *vscsi, |
177 | struct virtio_scsi_vq *virtscsi_vq, | |
7f82b3c9 | 178 | void (*fn)(struct virtio_scsi *vscsi, void *buf)) |
4fe74b1c | 179 | { |
4fe74b1c | 180 | void *buf; |
4fe74b1c | 181 | unsigned int len; |
10f34f64 PB |
182 | unsigned long flags; |
183 | struct virtqueue *vq = virtscsi_vq->vq; | |
4fe74b1c | 184 | |
10f34f64 | 185 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
186 | do { |
187 | virtqueue_disable_cb(vq); | |
188 | while ((buf = virtqueue_get_buf(vq, &len)) != NULL) | |
7f82b3c9 | 189 | fn(vscsi, buf); |
2bf4fd31 | 190 | |
4fe74b1c | 191 | } while (!virtqueue_enable_cb(vq)); |
10f34f64 | 192 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); |
4fe74b1c PB |
193 | } |
194 | ||
195 | static void virtscsi_req_done(struct virtqueue *vq) | |
196 | { | |
139fe45a PB |
197 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
198 | struct virtio_scsi *vscsi = shost_priv(sh); | |
9141a4ca PB |
199 | int index = vq->index - VIRTIO_SCSI_VQ_BASE; |
200 | struct virtio_scsi_vq *req_vq = &vscsi->req_vqs[index]; | |
201 | ||
9141a4ca | 202 | virtscsi_vq_done(vscsi, req_vq, virtscsi_complete_cmd); |
4fe74b1c PB |
203 | }; |
204 | ||
8faeb529 PB |
205 | static void virtscsi_poll_requests(struct virtio_scsi *vscsi) |
206 | { | |
207 | int i, num_vqs; | |
208 | ||
209 | num_vqs = vscsi->num_queues; | |
210 | for (i = 0; i < num_vqs; i++) | |
211 | virtscsi_vq_done(vscsi, &vscsi->req_vqs[i], | |
212 | virtscsi_complete_cmd); | |
213 | } | |
214 | ||
7f82b3c9 | 215 | static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) |
4fe74b1c PB |
216 | { |
217 | struct virtio_scsi_cmd *cmd = buf; | |
218 | ||
219 | if (cmd->comp) | |
e8f81420 | 220 | complete(cmd->comp); |
4fe74b1c PB |
221 | } |
222 | ||
223 | static void virtscsi_ctrl_done(struct virtqueue *vq) | |
224 | { | |
139fe45a PB |
225 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
226 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 227 | |
10f34f64 | 228 | virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free); |
4fe74b1c PB |
229 | }; |
230 | ||
cdda0e5a PB |
231 | static void virtscsi_handle_event(struct work_struct *work); |
232 | ||
365a7150 CM |
233 | static int virtscsi_kick_event(struct virtio_scsi *vscsi, |
234 | struct virtio_scsi_event_node *event_node) | |
235 | { | |
4614e51c | 236 | int err; |
365a7150 CM |
237 | struct scatterlist sg; |
238 | unsigned long flags; | |
239 | ||
cdda0e5a | 240 | INIT_WORK(&event_node->work, virtscsi_handle_event); |
2e9c9dfd | 241 | sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event)); |
365a7150 CM |
242 | |
243 | spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags); | |
244 | ||
bf958291 RR |
245 | err = virtqueue_add_inbuf(vscsi->event_vq.vq, &sg, 1, event_node, |
246 | GFP_ATOMIC); | |
4614e51c | 247 | if (!err) |
365a7150 CM |
248 | virtqueue_kick(vscsi->event_vq.vq); |
249 | ||
250 | spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags); | |
251 | ||
4614e51c | 252 | return err; |
365a7150 CM |
253 | } |
254 | ||
255 | static int virtscsi_kick_event_all(struct virtio_scsi *vscsi) | |
256 | { | |
257 | int i; | |
258 | ||
259 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) { | |
260 | vscsi->event_list[i].vscsi = vscsi; | |
261 | virtscsi_kick_event(vscsi, &vscsi->event_list[i]); | |
262 | } | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi) | |
268 | { | |
269 | int i; | |
270 | ||
e67423c7 MT |
271 | /* Stop scheduling work before calling cancel_work_sync. */ |
272 | spin_lock_irq(&vscsi->event_vq.vq_lock); | |
273 | vscsi->stop_events = true; | |
274 | spin_unlock_irq(&vscsi->event_vq.vq_lock); | |
275 | ||
365a7150 CM |
276 | for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) |
277 | cancel_work_sync(&vscsi->event_list[i].work); | |
278 | } | |
279 | ||
280 | static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi, | |
9141a4ca | 281 | struct virtio_scsi_event *event) |
365a7150 CM |
282 | { |
283 | struct scsi_device *sdev; | |
284 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
285 | unsigned int target = event->lun[1]; | |
286 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
287 | ||
d75dff39 | 288 | switch (virtio32_to_cpu(vscsi->vdev, event->reason)) { |
365a7150 | 289 | case VIRTIO_SCSI_EVT_RESET_RESCAN: |
beef6fd0 MG |
290 | if (lun == 0) { |
291 | scsi_scan_target(&shost->shost_gendev, 0, target, | |
292 | SCAN_WILD_CARD, SCSI_SCAN_INITIAL); | |
293 | } else { | |
294 | scsi_add_device(shost, 0, target, lun); | |
295 | } | |
365a7150 CM |
296 | break; |
297 | case VIRTIO_SCSI_EVT_RESET_REMOVED: | |
298 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
299 | if (sdev) { | |
300 | scsi_remove_device(sdev); | |
301 | scsi_device_put(sdev); | |
302 | } else { | |
303 | pr_err("SCSI device %d 0 %d %d not found\n", | |
304 | shost->host_no, target, lun); | |
305 | } | |
306 | break; | |
307 | default: | |
cced4c0e | 308 | pr_info("Unsupported virtio scsi event reason %x\n", event->reason); |
365a7150 CM |
309 | } |
310 | } | |
311 | ||
865b58c0 PB |
312 | static void virtscsi_handle_param_change(struct virtio_scsi *vscsi, |
313 | struct virtio_scsi_event *event) | |
314 | { | |
315 | struct scsi_device *sdev; | |
316 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
317 | unsigned int target = event->lun[1]; | |
318 | unsigned int lun = (event->lun[2] << 8) | event->lun[3]; | |
d75dff39 MT |
319 | u8 asc = virtio32_to_cpu(vscsi->vdev, event->reason) & 255; |
320 | u8 ascq = virtio32_to_cpu(vscsi->vdev, event->reason) >> 8; | |
865b58c0 PB |
321 | |
322 | sdev = scsi_device_lookup(shost, 0, target, lun); | |
323 | if (!sdev) { | |
324 | pr_err("SCSI device %d 0 %d %d not found\n", | |
325 | shost->host_no, target, lun); | |
326 | return; | |
327 | } | |
328 | ||
329 | /* Handle "Parameters changed", "Mode parameters changed", and | |
330 | "Capacity data has changed". */ | |
331 | if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09)) | |
79519528 | 332 | scsi_rescan_device(sdev); |
865b58c0 PB |
333 | |
334 | scsi_device_put(sdev); | |
335 | } | |
336 | ||
08707b5c | 337 | static int virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi) |
5ff84372 ML |
338 | { |
339 | struct scsi_device *sdev; | |
340 | struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev); | |
341 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
342 | int result, inquiry_len, inq_result_len = 256; | |
343 | char *inq_result = kmalloc(inq_result_len, GFP_KERNEL); | |
344 | ||
0e5e41ee | 345 | if (!inq_result) |
08707b5c | 346 | return -ENOMEM; |
08707b5c | 347 | |
5ff84372 ML |
348 | shost_for_each_device(sdev, shost) { |
349 | inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
350 | ||
351 | memset(scsi_cmd, 0, sizeof(scsi_cmd)); | |
352 | scsi_cmd[0] = INQUIRY; | |
353 | scsi_cmd[4] = (unsigned char) inquiry_len; | |
354 | ||
355 | memset(inq_result, 0, inq_result_len); | |
356 | ||
5314ce76 MC |
357 | result = scsi_execute_cmd(sdev, scsi_cmd, REQ_OP_DRV_IN, |
358 | inq_result, inquiry_len, | |
5ff84372 ML |
359 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
360 | ||
361 | if (result == 0 && inq_result[0] >> 5) { | |
362 | /* PQ indicates the LUN is not attached */ | |
363 | scsi_remove_device(sdev); | |
ced202f7 | 364 | } else if (result > 0 && host_byte(result) == DID_BAD_TARGET) { |
bb2e3314 ML |
365 | /* |
366 | * If all LUNs of a virtio-scsi device are unplugged | |
367 | * it will respond with BAD TARGET on any INQUIRY | |
368 | * command. | |
369 | * Remove the device in this case as well. | |
370 | */ | |
371 | scsi_remove_device(sdev); | |
5ff84372 ML |
372 | } |
373 | } | |
374 | ||
375 | kfree(inq_result); | |
08707b5c | 376 | return 0; |
5ff84372 ML |
377 | } |
378 | ||
365a7150 CM |
379 | static void virtscsi_handle_event(struct work_struct *work) |
380 | { | |
381 | struct virtio_scsi_event_node *event_node = | |
382 | container_of(work, struct virtio_scsi_event_node, work); | |
383 | struct virtio_scsi *vscsi = event_node->vscsi; | |
384 | struct virtio_scsi_event *event = &event_node->event; | |
385 | ||
d75dff39 MT |
386 | if (event->event & |
387 | cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) { | |
08707b5c ZW |
388 | int ret; |
389 | ||
d75dff39 MT |
390 | event->event &= ~cpu_to_virtio32(vscsi->vdev, |
391 | VIRTIO_SCSI_T_EVENTS_MISSED); | |
08707b5c ZW |
392 | ret = virtscsi_rescan_hotunplug(vscsi); |
393 | if (ret) | |
394 | return; | |
365a7150 CM |
395 | scsi_scan_host(virtio_scsi_host(vscsi->vdev)); |
396 | } | |
397 | ||
d75dff39 | 398 | switch (virtio32_to_cpu(vscsi->vdev, event->event)) { |
365a7150 CM |
399 | case VIRTIO_SCSI_T_NO_EVENT: |
400 | break; | |
401 | case VIRTIO_SCSI_T_TRANSPORT_RESET: | |
402 | virtscsi_handle_transport_reset(vscsi, event); | |
403 | break; | |
865b58c0 PB |
404 | case VIRTIO_SCSI_T_PARAM_CHANGE: |
405 | virtscsi_handle_param_change(vscsi, event); | |
406 | break; | |
365a7150 | 407 | default: |
cced4c0e | 408 | pr_err("Unsupported virtio scsi event %x\n", event->event); |
365a7150 CM |
409 | } |
410 | virtscsi_kick_event(vscsi, event_node); | |
411 | } | |
412 | ||
7f82b3c9 | 413 | static void virtscsi_complete_event(struct virtio_scsi *vscsi, void *buf) |
365a7150 CM |
414 | { |
415 | struct virtio_scsi_event_node *event_node = buf; | |
416 | ||
e67423c7 MT |
417 | if (!vscsi->stop_events) |
418 | queue_work(system_freezable_wq, &event_node->work); | |
365a7150 CM |
419 | } |
420 | ||
4fe74b1c PB |
421 | static void virtscsi_event_done(struct virtqueue *vq) |
422 | { | |
139fe45a PB |
423 | struct Scsi_Host *sh = virtio_scsi_host(vq->vdev); |
424 | struct virtio_scsi *vscsi = shost_priv(sh); | |
139fe45a | 425 | |
10f34f64 | 426 | virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event); |
4fe74b1c PB |
427 | }; |
428 | ||
9e5470fe | 429 | static int __virtscsi_add_cmd(struct virtqueue *vq, |
682993b4 | 430 | struct virtio_scsi_cmd *cmd, |
c77fba9a | 431 | size_t req_size, size_t resp_size) |
4fe74b1c PB |
432 | { |
433 | struct scsi_cmnd *sc = cmd->sc; | |
e6dc783a | 434 | struct scatterlist *sgs[6], req, resp; |
682993b4 WG |
435 | struct sg_table *out, *in; |
436 | unsigned out_num = 0, in_num = 0; | |
437 | ||
438 | out = in = NULL; | |
439 | ||
440 | if (sc && sc->sc_data_direction != DMA_NONE) { | |
441 | if (sc->sc_data_direction != DMA_FROM_DEVICE) | |
ae3d56d8 | 442 | out = &sc->sdb.table; |
682993b4 | 443 | if (sc->sc_data_direction != DMA_TO_DEVICE) |
ae3d56d8 | 444 | in = &sc->sdb.table; |
682993b4 | 445 | } |
4fe74b1c | 446 | |
4fe74b1c | 447 | /* Request header. */ |
682993b4 WG |
448 | sg_init_one(&req, &cmd->req, req_size); |
449 | sgs[out_num++] = &req; | |
4fe74b1c PB |
450 | |
451 | /* Data-out buffer. */ | |
e6dc783a NB |
452 | if (out) { |
453 | /* Place WRITE protection SGLs before Data OUT payload */ | |
454 | if (scsi_prot_sg_count(sc)) | |
455 | sgs[out_num++] = scsi_prot_sglist(sc); | |
682993b4 | 456 | sgs[out_num++] = out->sgl; |
e6dc783a | 457 | } |
4fe74b1c PB |
458 | |
459 | /* Response header. */ | |
682993b4 WG |
460 | sg_init_one(&resp, &cmd->resp, resp_size); |
461 | sgs[out_num + in_num++] = &resp; | |
4fe74b1c PB |
462 | |
463 | /* Data-in buffer */ | |
e6dc783a NB |
464 | if (in) { |
465 | /* Place READ protection SGLs before Data IN payload */ | |
466 | if (scsi_prot_sg_count(sc)) | |
467 | sgs[out_num + in_num++] = scsi_prot_sglist(sc); | |
682993b4 | 468 | sgs[out_num + in_num++] = in->sgl; |
e6dc783a | 469 | } |
4fe74b1c | 470 | |
c77fba9a | 471 | return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC); |
4fe74b1c PB |
472 | } |
473 | ||
9e5470fe PB |
474 | static void virtscsi_kick_vq(struct virtio_scsi_vq *vq) |
475 | { | |
476 | bool needs_kick; | |
477 | unsigned long flags; | |
478 | ||
479 | spin_lock_irqsave(&vq->vq_lock, flags); | |
480 | needs_kick = virtqueue_kick_prepare(vq->vq); | |
481 | spin_unlock_irqrestore(&vq->vq_lock, flags); | |
482 | ||
483 | if (needs_kick) | |
484 | virtqueue_notify(vq->vq); | |
485 | } | |
486 | ||
487 | /** | |
488 | * virtscsi_add_cmd - add a virtio_scsi_cmd to a virtqueue, optionally kick it | |
489 | * @vq : the struct virtqueue we're talking about | |
490 | * @cmd : command structure | |
491 | * @req_size : size of the request buffer | |
492 | * @resp_size : size of the response buffer | |
493 | * @kick : whether to kick the virtqueue immediately | |
494 | */ | |
495 | static int virtscsi_add_cmd(struct virtio_scsi_vq *vq, | |
4fe74b1c | 496 | struct virtio_scsi_cmd *cmd, |
9e5470fe PB |
497 | size_t req_size, size_t resp_size, |
498 | bool kick) | |
4fe74b1c | 499 | { |
4fe74b1c | 500 | unsigned long flags; |
4614e51c RR |
501 | int err; |
502 | bool needs_kick = false; | |
4fe74b1c | 503 | |
682993b4 | 504 | spin_lock_irqsave(&vq->vq_lock, flags); |
9e5470fe PB |
505 | err = __virtscsi_add_cmd(vq->vq, cmd, req_size, resp_size); |
506 | if (!err && kick) | |
4614e51c | 507 | needs_kick = virtqueue_kick_prepare(vq->vq); |
139fe45a | 508 | |
bce750b1 | 509 | spin_unlock_irqrestore(&vq->vq_lock, flags); |
4fe74b1c | 510 | |
4614e51c | 511 | if (needs_kick) |
139fe45a | 512 | virtqueue_notify(vq->vq); |
4614e51c | 513 | return err; |
4fe74b1c PB |
514 | } |
515 | ||
d75dff39 MT |
516 | static void virtio_scsi_init_hdr(struct virtio_device *vdev, |
517 | struct virtio_scsi_cmd_req *cmd, | |
e6dc783a NB |
518 | struct scsi_cmnd *sc) |
519 | { | |
520 | cmd->lun[0] = 1; | |
521 | cmd->lun[1] = sc->device->id; | |
522 | cmd->lun[2] = (sc->device->lun >> 8) | 0x40; | |
523 | cmd->lun[3] = sc->device->lun & 0xff; | |
d75dff39 | 524 | cmd->tag = cpu_to_virtio64(vdev, (unsigned long)sc); |
e6dc783a NB |
525 | cmd->task_attr = VIRTIO_SCSI_S_SIMPLE; |
526 | cmd->prio = 0; | |
527 | cmd->crn = 0; | |
528 | } | |
529 | ||
c5c2567f | 530 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
d75dff39 MT |
531 | static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev, |
532 | struct virtio_scsi_cmd_req_pi *cmd_pi, | |
e6dc783a NB |
533 | struct scsi_cmnd *sc) |
534 | { | |
7cc4554e | 535 | struct request *rq = scsi_cmd_to_rq(sc); |
e6dc783a NB |
536 | struct blk_integrity *bi; |
537 | ||
d75dff39 | 538 | virtio_scsi_init_hdr(vdev, (struct virtio_scsi_cmd_req *)cmd_pi, sc); |
e6dc783a NB |
539 | |
540 | if (!rq || !scsi_prot_sg_count(sc)) | |
541 | return; | |
542 | ||
f3fa33ac | 543 | bi = blk_get_integrity(rq->q->disk); |
e6dc783a NB |
544 | |
545 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
d75dff39 | 546 | cmd_pi->pi_bytesout = cpu_to_virtio32(vdev, |
cdcdcaae GE |
547 | bio_integrity_bytes(bi, |
548 | blk_rq_sectors(rq))); | |
e6dc783a | 549 | else if (sc->sc_data_direction == DMA_FROM_DEVICE) |
d75dff39 | 550 | cmd_pi->pi_bytesin = cpu_to_virtio32(vdev, |
cdcdcaae GE |
551 | bio_integrity_bytes(bi, |
552 | blk_rq_sectors(rq))); | |
e6dc783a | 553 | } |
c5c2567f | 554 | #endif |
e6dc783a | 555 | |
c3506df8 ML |
556 | static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi, |
557 | struct scsi_cmnd *sc) | |
558 | { | |
7cc4554e | 559 | u32 tag = blk_mq_unique_tag(scsi_cmd_to_rq(sc)); |
c3506df8 ML |
560 | u16 hwq = blk_mq_unique_tag_to_hwq(tag); |
561 | ||
562 | return &vscsi->req_vqs[hwq]; | |
563 | } | |
564 | ||
565 | static int virtscsi_queuecommand(struct Scsi_Host *shost, | |
9141a4ca | 566 | struct scsi_cmnd *sc) |
4fe74b1c | 567 | { |
c3506df8 ML |
568 | struct virtio_scsi *vscsi = shost_priv(shost); |
569 | struct virtio_scsi_vq *req_vq = virtscsi_pick_vq_mq(vscsi, sc); | |
b54197c4 | 570 | struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc); |
9e5470fe | 571 | bool kick; |
773c7220 | 572 | unsigned long flags; |
ed9ea4ed | 573 | int req_size; |
773c7220 | 574 | int ret; |
b54197c4 | 575 | |
2bd37f0f PB |
576 | BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize); |
577 | ||
578 | /* TODO: check feature bit and fail if unsupported? */ | |
579 | BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL); | |
580 | ||
4fe74b1c PB |
581 | dev_dbg(&sc->device->sdev_gendev, |
582 | "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]); | |
583 | ||
4fe74b1c | 584 | cmd->sc = sc; |
4fe74b1c PB |
585 | |
586 | BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE); | |
4fe74b1c | 587 | |
c5c2567f | 588 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 589 | if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) { |
d75dff39 | 590 | virtio_scsi_init_hdr_pi(vscsi->vdev, &cmd->req.cmd_pi, sc); |
e6dc783a NB |
591 | memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len); |
592 | req_size = sizeof(cmd->req.cmd_pi); | |
c5c2567f CH |
593 | } else |
594 | #endif | |
595 | { | |
d75dff39 | 596 | virtio_scsi_init_hdr(vscsi->vdev, &cmd->req.cmd, sc); |
e6dc783a NB |
597 | memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len); |
598 | req_size = sizeof(cmd->req.cmd); | |
599 | } | |
600 | ||
9e5470fe PB |
601 | kick = (sc->flags & SCMD_LAST) != 0; |
602 | ret = virtscsi_add_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd), kick); | |
773c7220 EF |
603 | if (ret == -EIO) { |
604 | cmd->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; | |
605 | spin_lock_irqsave(&req_vq->vq_lock, flags); | |
606 | virtscsi_complete_cmd(vscsi, cmd); | |
607 | spin_unlock_irqrestore(&req_vq->vq_lock, flags); | |
608 | } else if (ret != 0) { | |
b54197c4 | 609 | return SCSI_MLQUEUE_HOST_BUSY; |
773c7220 | 610 | } |
b54197c4 | 611 | return 0; |
4fe74b1c PB |
612 | } |
613 | ||
614 | static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd) | |
615 | { | |
616 | DECLARE_COMPLETION_ONSTACK(comp); | |
e4594bb5 | 617 | int ret = FAILED; |
4fe74b1c PB |
618 | |
619 | cmd->comp = ∁ | |
9e5470fe PB |
620 | if (virtscsi_add_cmd(&vscsi->ctrl_vq, cmd, |
621 | sizeof cmd->req.tmf, sizeof cmd->resp.tmf, true) < 0) | |
e4594bb5 | 622 | goto out; |
4fe74b1c PB |
623 | |
624 | wait_for_completion(&comp); | |
e4594bb5 PB |
625 | if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK || |
626 | cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED) | |
627 | ret = SUCCESS; | |
4fe74b1c | 628 | |
8faeb529 PB |
629 | /* |
630 | * The spec guarantees that all requests related to the TMF have | |
631 | * been completed, but the callback might not have run yet if | |
632 | * we're using independent interrupts (e.g. MSI). Poll the | |
633 | * virtqueues once. | |
634 | * | |
b4194fcb BVA |
635 | * In the abort case, scsi_done() will do nothing, because the |
636 | * command timed out and hence SCMD_STATE_COMPLETE has been set. | |
8faeb529 PB |
637 | */ |
638 | virtscsi_poll_requests(vscsi); | |
639 | ||
e4594bb5 PB |
640 | out: |
641 | mempool_free(cmd, virtscsi_cmd_pool); | |
642 | return ret; | |
4fe74b1c PB |
643 | } |
644 | ||
645 | static int virtscsi_device_reset(struct scsi_cmnd *sc) | |
646 | { | |
647 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
648 | struct virtio_scsi_cmd *cmd; | |
649 | ||
650 | sdev_printk(KERN_INFO, sc->device, "device reset\n"); | |
651 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
652 | if (!cmd) | |
653 | return FAILED; | |
654 | ||
655 | memset(cmd, 0, sizeof(*cmd)); | |
4fe74b1c PB |
656 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
657 | .type = VIRTIO_SCSI_T_TMF, | |
d75dff39 MT |
658 | .subtype = cpu_to_virtio32(vscsi->vdev, |
659 | VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET), | |
4fe74b1c PB |
660 | .lun[0] = 1, |
661 | .lun[1] = sc->device->id, | |
662 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
663 | .lun[3] = sc->device->lun & 0xff, | |
664 | }; | |
665 | return virtscsi_tmf(vscsi, cmd); | |
666 | } | |
667 | ||
25d1d50e DG |
668 | static int virtscsi_device_alloc(struct scsi_device *sdevice) |
669 | { | |
670 | /* | |
671 | * Passed through SCSI targets (e.g. with qemu's 'scsi-block') | |
672 | * may have transfer limits which come from the host SCSI | |
673 | * controller or something on the host side other than the | |
674 | * target itself. | |
675 | * | |
676 | * To make this work properly, the hypervisor can adjust the | |
677 | * target's VPD information to advertise these limits. But | |
678 | * for that to work, the guest has to look at the VPD pages, | |
679 | * which we won't do by default if it is an SPC-2 device, even | |
680 | * if it does actually support it. | |
681 | * | |
682 | * So, set the blist to always try to read the VPD pages. | |
683 | */ | |
684 | sdevice->sdev_bflags = BLIST_TRY_VPD_PAGES; | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | ||
761f1193 VS |
690 | /** |
691 | * virtscsi_change_queue_depth() - Change a virtscsi target's queue depth | |
692 | * @sdev: Virtscsi target whose queue depth to change | |
693 | * @qdepth: New queue depth | |
761f1193 | 694 | */ |
db5ed4df | 695 | static int virtscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
761f1193 VS |
696 | { |
697 | struct Scsi_Host *shost = sdev->host; | |
698 | int max_depth = shost->cmd_per_lun; | |
699 | ||
db5ed4df | 700 | return scsi_change_queue_depth(sdev, min(max_depth, qdepth)); |
761f1193 VS |
701 | } |
702 | ||
4fe74b1c PB |
703 | static int virtscsi_abort(struct scsi_cmnd *sc) |
704 | { | |
705 | struct virtio_scsi *vscsi = shost_priv(sc->device->host); | |
706 | struct virtio_scsi_cmd *cmd; | |
707 | ||
708 | scmd_printk(KERN_INFO, sc, "abort\n"); | |
709 | cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO); | |
710 | if (!cmd) | |
711 | return FAILED; | |
712 | ||
713 | memset(cmd, 0, sizeof(*cmd)); | |
4fe74b1c PB |
714 | cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){ |
715 | .type = VIRTIO_SCSI_T_TMF, | |
716 | .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK, | |
717 | .lun[0] = 1, | |
718 | .lun[1] = sc->device->id, | |
719 | .lun[2] = (sc->device->lun >> 8) | 0x40, | |
720 | .lun[3] = sc->device->lun & 0xff, | |
d75dff39 | 721 | .tag = cpu_to_virtio64(vscsi->vdev, (unsigned long)sc), |
4fe74b1c PB |
722 | }; |
723 | return virtscsi_tmf(vscsi, cmd); | |
724 | } | |
725 | ||
a4e1d0b7 | 726 | static void virtscsi_map_queues(struct Scsi_Host *shost) |
0d9f0a52 CH |
727 | { |
728 | struct virtio_scsi *vscsi = shost_priv(shost); | |
95e72496 MC |
729 | int i, qoff; |
730 | ||
731 | for (i = 0, qoff = 0; i < shost->nr_maps; i++) { | |
732 | struct blk_mq_queue_map *map = &shost->tag_set.map[i]; | |
733 | ||
734 | map->nr_queues = vscsi->io_queues[i]; | |
735 | map->queue_offset = qoff; | |
736 | qoff += map->nr_queues; | |
737 | ||
738 | if (map->nr_queues == 0) | |
739 | continue; | |
740 | ||
741 | /* | |
742 | * Regular queues have interrupts and hence CPU affinity is | |
743 | * defined by the core virtio code, but polling queues have | |
744 | * no interrupts so we let the block layer assign CPU affinity. | |
745 | */ | |
746 | if (i == HCTX_TYPE_POLL) | |
747 | blk_mq_map_queues(map); | |
748 | else | |
749 | blk_mq_virtio_map_queues(map, vscsi->vdev, 2); | |
750 | } | |
751 | } | |
752 | ||
753 | static int virtscsi_mq_poll(struct Scsi_Host *shost, unsigned int queue_num) | |
754 | { | |
755 | struct virtio_scsi *vscsi = shost_priv(shost); | |
756 | struct virtio_scsi_vq *virtscsi_vq = &vscsi->req_vqs[queue_num]; | |
757 | unsigned long flags; | |
758 | unsigned int len; | |
759 | int found = 0; | |
760 | void *buf; | |
761 | ||
762 | spin_lock_irqsave(&virtscsi_vq->vq_lock, flags); | |
763 | ||
764 | while ((buf = virtqueue_get_buf(virtscsi_vq->vq, &len)) != NULL) { | |
765 | virtscsi_complete_cmd(vscsi, buf); | |
766 | found++; | |
767 | } | |
768 | ||
769 | spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); | |
0d9f0a52 | 770 | |
95e72496 | 771 | return found; |
0d9f0a52 CH |
772 | } |
773 | ||
9e5470fe PB |
774 | static void virtscsi_commit_rqs(struct Scsi_Host *shost, u16 hwq) |
775 | { | |
776 | struct virtio_scsi *vscsi = shost_priv(shost); | |
777 | ||
778 | virtscsi_kick_vq(&vscsi->req_vqs[hwq]); | |
779 | } | |
780 | ||
e72c9a2a PB |
781 | /* |
782 | * The host guarantees to respond to each command, although I/O | |
783 | * latencies might be higher than on bare metal. Reset the timer | |
784 | * unconditionally to give the host a chance to perform EH. | |
785 | */ | |
dee7121e | 786 | static enum scsi_timeout_action virtscsi_eh_timed_out(struct scsi_cmnd *scmnd) |
e72c9a2a | 787 | { |
dee7121e | 788 | return SCSI_EH_RESET_TIMER; |
e72c9a2a PB |
789 | } |
790 | ||
273ab251 | 791 | static const struct scsi_host_template virtscsi_host_template = { |
4fe74b1c PB |
792 | .module = THIS_MODULE, |
793 | .name = "Virtio SCSI HBA", | |
794 | .proc_name = "virtio_scsi", | |
4fe74b1c | 795 | .this_id = -1, |
b54197c4 | 796 | .cmd_size = sizeof(struct virtio_scsi_cmd), |
c3506df8 | 797 | .queuecommand = virtscsi_queuecommand, |
95e72496 | 798 | .mq_poll = virtscsi_mq_poll, |
9e5470fe | 799 | .commit_rqs = virtscsi_commit_rqs, |
761f1193 | 800 | .change_queue_depth = virtscsi_change_queue_depth, |
4fe74b1c PB |
801 | .eh_abort_handler = virtscsi_abort, |
802 | .eh_device_reset_handler = virtscsi_device_reset, | |
e72c9a2a | 803 | .eh_timed_out = virtscsi_eh_timed_out, |
a680f1d4 | 804 | .slave_alloc = virtscsi_device_alloc, |
4fe74b1c | 805 | |
4fe74b1c | 806 | .dma_boundary = UINT_MAX, |
0d9f0a52 | 807 | .map_queues = virtscsi_map_queues, |
c40ecc12 | 808 | .track_queue_depth = 1, |
4fe74b1c PB |
809 | }; |
810 | ||
811 | #define virtscsi_config_get(vdev, fld) \ | |
812 | ({ \ | |
965b5350 | 813 | __virtio_native_type(struct virtio_scsi_config, fld) __val; \ |
855e0c52 | 814 | virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \ |
4fe74b1c PB |
815 | __val; \ |
816 | }) | |
817 | ||
818 | #define virtscsi_config_set(vdev, fld, val) \ | |
855e0c52 | 819 | do { \ |
965b5350 | 820 | __virtio_native_type(struct virtio_scsi_config, fld) __val = (val); \ |
855e0c52 RR |
821 | virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \ |
822 | } while(0) | |
4fe74b1c | 823 | |
139fe45a PB |
824 | static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, |
825 | struct virtqueue *vq) | |
826 | { | |
827 | spin_lock_init(&virtscsi_vq->vq_lock); | |
828 | virtscsi_vq->vq = vq; | |
829 | } | |
830 | ||
2bd37f0f PB |
831 | static void virtscsi_remove_vqs(struct virtio_device *vdev) |
832 | { | |
2bd37f0f | 833 | /* Stop all the virtqueues. */ |
d9679d00 | 834 | virtio_reset_device(vdev); |
2bd37f0f PB |
835 | vdev->config->del_vqs(vdev); |
836 | } | |
837 | ||
4fe74b1c | 838 | static int virtscsi_init(struct virtio_device *vdev, |
5c370194 | 839 | struct virtio_scsi *vscsi) |
4fe74b1c PB |
840 | { |
841 | int err; | |
9141a4ca | 842 | u32 i; |
95e72496 | 843 | u32 num_vqs, num_poll_vqs, num_req_vqs; |
9141a4ca PB |
844 | vq_callback_t **callbacks; |
845 | const char **names; | |
846 | struct virtqueue **vqs; | |
0d9f0a52 | 847 | struct irq_affinity desc = { .pre_vectors = 2 }; |
9141a4ca | 848 | |
95e72496 MC |
849 | num_req_vqs = vscsi->num_queues; |
850 | num_vqs = num_req_vqs + VIRTIO_SCSI_VQ_BASE; | |
6da2ec56 KC |
851 | vqs = kmalloc_array(num_vqs, sizeof(struct virtqueue *), GFP_KERNEL); |
852 | callbacks = kmalloc_array(num_vqs, sizeof(vq_callback_t *), | |
853 | GFP_KERNEL); | |
854 | names = kmalloc_array(num_vqs, sizeof(char *), GFP_KERNEL); | |
9141a4ca PB |
855 | |
856 | if (!callbacks || !vqs || !names) { | |
857 | err = -ENOMEM; | |
858 | goto out; | |
859 | } | |
2bd37f0f | 860 | |
95e72496 MC |
861 | num_poll_vqs = min_t(unsigned int, virtscsi_poll_queues, |
862 | num_req_vqs - 1); | |
863 | vscsi->io_queues[HCTX_TYPE_DEFAULT] = num_req_vqs - num_poll_vqs; | |
864 | vscsi->io_queues[HCTX_TYPE_READ] = 0; | |
865 | vscsi->io_queues[HCTX_TYPE_POLL] = num_poll_vqs; | |
866 | ||
867 | dev_info(&vdev->dev, "%d/%d/%d default/read/poll queues\n", | |
868 | vscsi->io_queues[HCTX_TYPE_DEFAULT], | |
869 | vscsi->io_queues[HCTX_TYPE_READ], | |
870 | vscsi->io_queues[HCTX_TYPE_POLL]); | |
871 | ||
9141a4ca PB |
872 | callbacks[0] = virtscsi_ctrl_done; |
873 | callbacks[1] = virtscsi_event_done; | |
874 | names[0] = "control"; | |
875 | names[1] = "event"; | |
95e72496 | 876 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs - num_poll_vqs; i++) { |
9141a4ca PB |
877 | callbacks[i] = virtscsi_req_done; |
878 | names[i] = "request"; | |
879 | } | |
4fe74b1c | 880 | |
95e72496 MC |
881 | for (; i < num_vqs; i++) { |
882 | callbacks[i] = NULL; | |
883 | names[i] = "request_poll"; | |
884 | } | |
885 | ||
4fe74b1c | 886 | /* Discover virtqueues and write information to configuration. */ |
9b2bbdb2 | 887 | err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc); |
4fe74b1c | 888 | if (err) |
9141a4ca | 889 | goto out; |
4fe74b1c | 890 | |
139fe45a PB |
891 | virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]); |
892 | virtscsi_init_vq(&vscsi->event_vq, vqs[1]); | |
9141a4ca PB |
893 | for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++) |
894 | virtscsi_init_vq(&vscsi->req_vqs[i - VIRTIO_SCSI_VQ_BASE], | |
895 | vqs[i]); | |
896 | ||
4fe74b1c PB |
897 | virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE); |
898 | virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE); | |
2bd37f0f | 899 | |
9141a4ca PB |
900 | err = 0; |
901 | ||
902 | out: | |
903 | kfree(names); | |
904 | kfree(callbacks); | |
905 | kfree(vqs); | |
906 | if (err) | |
907 | virtscsi_remove_vqs(vdev); | |
2bd37f0f | 908 | return err; |
4fe74b1c PB |
909 | } |
910 | ||
6f039790 | 911 | static int virtscsi_probe(struct virtio_device *vdev) |
4fe74b1c PB |
912 | { |
913 | struct Scsi_Host *shost; | |
914 | struct virtio_scsi *vscsi; | |
908a5544 | 915 | int err; |
2bd37f0f | 916 | u32 sg_elems, num_targets; |
4fe74b1c | 917 | u32 cmd_per_lun; |
9141a4ca | 918 | u32 num_queues; |
9141a4ca | 919 | |
8cab3cd6 MT |
920 | if (!vdev->config->get) { |
921 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
922 | __func__); | |
923 | return -EINVAL; | |
924 | } | |
925 | ||
9141a4ca PB |
926 | /* We need to know how many queues before we allocate. */ |
927 | num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; | |
1978f30a | 928 | num_queues = min_t(unsigned int, nr_cpu_ids, num_queues); |
4fe74b1c | 929 | |
2bd37f0f | 930 | num_targets = virtscsi_config_get(vdev, max_target) + 1; |
4fe74b1c | 931 | |
c3506df8 | 932 | shost = scsi_host_alloc(&virtscsi_host_template, |
211f70ff | 933 | struct_size(vscsi, req_vqs, num_queues)); |
4fe74b1c PB |
934 | if (!shost) |
935 | return -ENOMEM; | |
936 | ||
2bd37f0f | 937 | sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1; |
4fe74b1c | 938 | shost->sg_tablesize = sg_elems; |
95e72496 | 939 | shost->nr_maps = 1; |
4fe74b1c PB |
940 | vscsi = shost_priv(shost); |
941 | vscsi->vdev = vdev; | |
9141a4ca | 942 | vscsi->num_queues = num_queues; |
4fe74b1c PB |
943 | vdev->priv = shost; |
944 | ||
5c370194 | 945 | err = virtscsi_init(vdev, vscsi); |
4fe74b1c PB |
946 | if (err) |
947 | goto virtscsi_init_failed; | |
948 | ||
95e72496 MC |
949 | if (vscsi->io_queues[HCTX_TYPE_POLL]) |
950 | shost->nr_maps = HCTX_TYPE_POLL + 1; | |
951 | ||
582b0ab2 RJ |
952 | shost->can_queue = virtqueue_get_vring_size(vscsi->req_vqs[0].vq); |
953 | ||
4fe74b1c PB |
954 | cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; |
955 | shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); | |
956 | shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; | |
9da5f5ac PB |
957 | |
958 | /* LUNs > 256 are reported with format 1, so they go in the range | |
959 | * 16640-32767. | |
960 | */ | |
961 | shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000; | |
2bd37f0f | 962 | shost->max_id = num_targets; |
4fe74b1c PB |
963 | shost->max_channel = 0; |
964 | shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; | |
ccbedf11 | 965 | shost->nr_hw_queues = num_queues; |
e6dc783a | 966 | |
c5c2567f | 967 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 968 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) { |
908a5544 SR |
969 | int host_prot; |
970 | ||
e6dc783a NB |
971 | host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | |
972 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | | |
973 | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; | |
974 | ||
975 | scsi_host_set_prot(shost, host_prot); | |
976 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
977 | } | |
c5c2567f | 978 | #endif |
e6dc783a | 979 | |
4fe74b1c PB |
980 | err = scsi_add_host(shost, &vdev->dev); |
981 | if (err) | |
982 | goto scsi_add_host_failed; | |
5d8f16d0 MT |
983 | |
984 | virtio_device_ready(vdev); | |
985 | ||
986 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
987 | virtscsi_kick_event_all(vscsi); | |
988 | ||
989 | scsi_scan_host(shost); | |
4fe74b1c PB |
990 | return 0; |
991 | ||
992 | scsi_add_host_failed: | |
993 | vdev->config->del_vqs(vdev); | |
994 | virtscsi_init_failed: | |
995 | scsi_host_put(shost); | |
996 | return err; | |
997 | } | |
998 | ||
6f039790 | 999 | static void virtscsi_remove(struct virtio_device *vdev) |
4fe74b1c PB |
1000 | { |
1001 | struct Scsi_Host *shost = virtio_scsi_host(vdev); | |
365a7150 CM |
1002 | struct virtio_scsi *vscsi = shost_priv(shost); |
1003 | ||
1004 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) | |
1005 | virtscsi_cancel_event_work(vscsi); | |
4fe74b1c PB |
1006 | |
1007 | scsi_remove_host(shost); | |
4fe74b1c PB |
1008 | virtscsi_remove_vqs(vdev); |
1009 | scsi_host_put(shost); | |
1010 | } | |
1011 | ||
89107000 | 1012 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1013 | static int virtscsi_freeze(struct virtio_device *vdev) |
1014 | { | |
1015 | virtscsi_remove_vqs(vdev); | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | static int virtscsi_restore(struct virtio_device *vdev) | |
1020 | { | |
1021 | struct Scsi_Host *sh = virtio_scsi_host(vdev); | |
1022 | struct virtio_scsi *vscsi = shost_priv(sh); | |
f466f753 AH |
1023 | int err; |
1024 | ||
1025 | err = virtscsi_init(vdev, vscsi); | |
1026 | if (err) | |
1027 | return err; | |
1028 | ||
52c9cf1a MT |
1029 | virtio_device_ready(vdev); |
1030 | ||
cd679048 MT |
1031 | if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) |
1032 | virtscsi_kick_event_all(vscsi); | |
4fe74b1c | 1033 | |
f466f753 | 1034 | return err; |
4fe74b1c PB |
1035 | } |
1036 | #endif | |
1037 | ||
1038 | static struct virtio_device_id id_table[] = { | |
1039 | { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID }, | |
1040 | { 0 }, | |
1041 | }; | |
1042 | ||
365a7150 | 1043 | static unsigned int features[] = { |
865b58c0 PB |
1044 | VIRTIO_SCSI_F_HOTPLUG, |
1045 | VIRTIO_SCSI_F_CHANGE, | |
c5c2567f | 1046 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e6dc783a | 1047 | VIRTIO_SCSI_F_T10_PI, |
c5c2567f | 1048 | #endif |
365a7150 CM |
1049 | }; |
1050 | ||
4fe74b1c | 1051 | static struct virtio_driver virtio_scsi_driver = { |
365a7150 CM |
1052 | .feature_table = features, |
1053 | .feature_table_size = ARRAY_SIZE(features), | |
4fe74b1c | 1054 | .driver.name = KBUILD_MODNAME, |
4fe74b1c PB |
1055 | .id_table = id_table, |
1056 | .probe = virtscsi_probe, | |
89107000 | 1057 | #ifdef CONFIG_PM_SLEEP |
4fe74b1c PB |
1058 | .freeze = virtscsi_freeze, |
1059 | .restore = virtscsi_restore, | |
1060 | #endif | |
6f039790 | 1061 | .remove = virtscsi_remove, |
4fe74b1c PB |
1062 | }; |
1063 | ||
41b8c2a3 | 1064 | static int __init virtio_scsi_init(void) |
4fe74b1c PB |
1065 | { |
1066 | int ret = -ENOMEM; | |
1067 | ||
1068 | virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0); | |
1069 | if (!virtscsi_cmd_cache) { | |
ba06d1e1 | 1070 | pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n"); |
4fe74b1c PB |
1071 | goto error; |
1072 | } | |
1073 | ||
1074 | ||
1075 | virtscsi_cmd_pool = | |
1076 | mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ, | |
1077 | virtscsi_cmd_cache); | |
1078 | if (!virtscsi_cmd_pool) { | |
ba06d1e1 | 1079 | pr_err("mempool_create() for virtscsi_cmd_pool failed\n"); |
4fe74b1c PB |
1080 | goto error; |
1081 | } | |
1082 | ret = register_virtio_driver(&virtio_scsi_driver); | |
1083 | if (ret < 0) | |
1084 | goto error; | |
1085 | ||
1086 | return 0; | |
1087 | ||
1088 | error: | |
92e8d032 XT |
1089 | mempool_destroy(virtscsi_cmd_pool); |
1090 | virtscsi_cmd_pool = NULL; | |
1091 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1092 | virtscsi_cmd_cache = NULL; | |
4fe74b1c PB |
1093 | return ret; |
1094 | } | |
1095 | ||
41b8c2a3 | 1096 | static void __exit virtio_scsi_fini(void) |
4fe74b1c PB |
1097 | { |
1098 | unregister_virtio_driver(&virtio_scsi_driver); | |
1099 | mempool_destroy(virtscsi_cmd_pool); | |
1100 | kmem_cache_destroy(virtscsi_cmd_cache); | |
1101 | } | |
41b8c2a3 RD |
1102 | module_init(virtio_scsi_init); |
1103 | module_exit(virtio_scsi_fini); | |
4fe74b1c PB |
1104 | |
1105 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1106 | MODULE_DESCRIPTION("Virtio SCSI HBA driver"); | |
1107 | MODULE_LICENSE("GPL"); |