]>
Commit | Line | Data |
---|---|---|
973abc7f SH |
1 | /* |
2 | * Virtio SCSI HBA | |
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 | ||
16 | #include "virtio-scsi.h" | |
17 | #include <hw/scsi.h> | |
18 | #include <hw/scsi-defs.h> | |
19 | ||
20 | #define VIRTIO_SCSI_VQ_SIZE 128 | |
21 | #define VIRTIO_SCSI_CDB_SIZE 32 | |
22 | #define VIRTIO_SCSI_SENSE_SIZE 96 | |
23 | #define VIRTIO_SCSI_MAX_CHANNEL 0 | |
24 | #define VIRTIO_SCSI_MAX_TARGET 255 | |
25 | #define VIRTIO_SCSI_MAX_LUN 16383 | |
26 | ||
b6866fee CM |
27 | /* Feature Bits */ |
28 | #define VIRTIO_SCSI_F_INOUT 0 | |
29 | #define VIRTIO_SCSI_F_HOTPLUG 1 | |
feda01e4 | 30 | #define VIRTIO_SCSI_F_CHANGE 2 |
b6866fee | 31 | |
973abc7f SH |
32 | /* Response codes */ |
33 | #define VIRTIO_SCSI_S_OK 0 | |
34 | #define VIRTIO_SCSI_S_OVERRUN 1 | |
35 | #define VIRTIO_SCSI_S_ABORTED 2 | |
36 | #define VIRTIO_SCSI_S_BAD_TARGET 3 | |
37 | #define VIRTIO_SCSI_S_RESET 4 | |
38 | #define VIRTIO_SCSI_S_BUSY 5 | |
39 | #define VIRTIO_SCSI_S_TRANSPORT_FAILURE 6 | |
40 | #define VIRTIO_SCSI_S_TARGET_FAILURE 7 | |
41 | #define VIRTIO_SCSI_S_NEXUS_FAILURE 8 | |
42 | #define VIRTIO_SCSI_S_FAILURE 9 | |
43 | #define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED 10 | |
44 | #define VIRTIO_SCSI_S_FUNCTION_REJECTED 11 | |
45 | #define VIRTIO_SCSI_S_INCORRECT_LUN 12 | |
46 | ||
47 | /* Controlq type codes. */ | |
48 | #define VIRTIO_SCSI_T_TMF 0 | |
49 | #define VIRTIO_SCSI_T_AN_QUERY 1 | |
50 | #define VIRTIO_SCSI_T_AN_SUBSCRIBE 2 | |
51 | ||
52 | /* Valid TMF subtypes. */ | |
53 | #define VIRTIO_SCSI_T_TMF_ABORT_TASK 0 | |
54 | #define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET 1 | |
55 | #define VIRTIO_SCSI_T_TMF_CLEAR_ACA 2 | |
56 | #define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET 3 | |
57 | #define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET 4 | |
58 | #define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET 5 | |
59 | #define VIRTIO_SCSI_T_TMF_QUERY_TASK 6 | |
60 | #define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET 7 | |
61 | ||
62 | /* Events. */ | |
63 | #define VIRTIO_SCSI_T_EVENTS_MISSED 0x80000000 | |
64 | #define VIRTIO_SCSI_T_NO_EVENT 0 | |
65 | #define VIRTIO_SCSI_T_TRANSPORT_RESET 1 | |
66 | #define VIRTIO_SCSI_T_ASYNC_NOTIFY 2 | |
feda01e4 | 67 | #define VIRTIO_SCSI_T_PARAM_CHANGE 3 |
973abc7f | 68 | |
b6866fee CM |
69 | /* Reasons for transport reset event */ |
70 | #define VIRTIO_SCSI_EVT_RESET_HARD 0 | |
71 | #define VIRTIO_SCSI_EVT_RESET_RESCAN 1 | |
72 | #define VIRTIO_SCSI_EVT_RESET_REMOVED 2 | |
73 | ||
973abc7f SH |
74 | /* SCSI command request, followed by data-out */ |
75 | typedef struct { | |
76 | uint8_t lun[8]; /* Logical Unit Number */ | |
77 | uint64_t tag; /* Command identifier */ | |
78 | uint8_t task_attr; /* Task attribute */ | |
79 | uint8_t prio; | |
80 | uint8_t crn; | |
81 | uint8_t cdb[]; | |
82 | } QEMU_PACKED VirtIOSCSICmdReq; | |
83 | ||
84 | /* Response, followed by sense data and data-in */ | |
85 | typedef struct { | |
86 | uint32_t sense_len; /* Sense data length */ | |
87 | uint32_t resid; /* Residual bytes in data buffer */ | |
88 | uint16_t status_qualifier; /* Status qualifier */ | |
89 | uint8_t status; /* Command completion status */ | |
90 | uint8_t response; /* Response values */ | |
91 | uint8_t sense[]; | |
92 | } QEMU_PACKED VirtIOSCSICmdResp; | |
93 | ||
94 | /* Task Management Request */ | |
95 | typedef struct { | |
96 | uint32_t type; | |
97 | uint32_t subtype; | |
98 | uint8_t lun[8]; | |
99 | uint64_t tag; | |
100 | } QEMU_PACKED VirtIOSCSICtrlTMFReq; | |
101 | ||
102 | typedef struct { | |
103 | uint8_t response; | |
104 | } QEMU_PACKED VirtIOSCSICtrlTMFResp; | |
105 | ||
106 | /* Asynchronous notification query/subscription */ | |
107 | typedef struct { | |
108 | uint32_t type; | |
109 | uint8_t lun[8]; | |
110 | uint32_t event_requested; | |
111 | } QEMU_PACKED VirtIOSCSICtrlANReq; | |
112 | ||
113 | typedef struct { | |
114 | uint32_t event_actual; | |
115 | uint8_t response; | |
116 | } QEMU_PACKED VirtIOSCSICtrlANResp; | |
117 | ||
118 | typedef struct { | |
119 | uint32_t event; | |
120 | uint8_t lun[8]; | |
121 | uint32_t reason; | |
122 | } QEMU_PACKED VirtIOSCSIEvent; | |
123 | ||
124 | typedef struct { | |
125 | uint32_t num_queues; | |
126 | uint32_t seg_max; | |
127 | uint32_t max_sectors; | |
128 | uint32_t cmd_per_lun; | |
129 | uint32_t event_info_size; | |
130 | uint32_t sense_size; | |
131 | uint32_t cdb_size; | |
132 | uint16_t max_channel; | |
133 | uint16_t max_target; | |
134 | uint32_t max_lun; | |
135 | } QEMU_PACKED VirtIOSCSIConfig; | |
136 | ||
137 | typedef struct { | |
138 | VirtIODevice vdev; | |
139 | DeviceState *qdev; | |
140 | VirtIOSCSIConf *conf; | |
141 | ||
2ccdcd8d | 142 | SCSIBus bus; |
973abc7f SH |
143 | uint32_t sense_size; |
144 | uint32_t cdb_size; | |
06114d72 | 145 | int resetting; |
64f64855 | 146 | bool events_dropped; |
d2ad7dd4 PB |
147 | VirtQueue *ctrl_vq; |
148 | VirtQueue *event_vq; | |
149 | VirtQueue *cmd_vqs[0]; | |
973abc7f SH |
150 | } VirtIOSCSI; |
151 | ||
326799c0 SH |
152 | typedef struct VirtIOSCSIReq { |
153 | VirtIOSCSI *dev; | |
154 | VirtQueue *vq; | |
155 | VirtQueueElement elem; | |
156 | QEMUSGList qsgl; | |
157 | SCSIRequest *sreq; | |
158 | union { | |
159 | char *buf; | |
160 | VirtIOSCSICmdReq *cmd; | |
161 | VirtIOSCSICtrlTMFReq *tmf; | |
162 | VirtIOSCSICtrlANReq *an; | |
163 | } req; | |
164 | union { | |
165 | char *buf; | |
166 | VirtIOSCSICmdResp *cmd; | |
167 | VirtIOSCSICtrlTMFResp *tmf; | |
168 | VirtIOSCSICtrlANResp *an; | |
169 | VirtIOSCSIEvent *event; | |
170 | } resp; | |
171 | } VirtIOSCSIReq; | |
172 | ||
2ccdcd8d PB |
173 | static inline int virtio_scsi_get_lun(uint8_t *lun) |
174 | { | |
175 | return ((lun[2] << 8) | lun[3]) & 0x3FFF; | |
176 | } | |
177 | ||
178 | static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun) | |
179 | { | |
180 | if (lun[0] != 1) { | |
181 | return NULL; | |
182 | } | |
183 | if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) { | |
184 | return NULL; | |
185 | } | |
186 | return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); | |
187 | } | |
188 | ||
326799c0 SH |
189 | static void virtio_scsi_complete_req(VirtIOSCSIReq *req) |
190 | { | |
191 | VirtIOSCSI *s = req->dev; | |
192 | VirtQueue *vq = req->vq; | |
193 | virtqueue_push(vq, &req->elem, req->qsgl.size + req->elem.in_sg[0].iov_len); | |
194 | qemu_sglist_destroy(&req->qsgl); | |
195 | if (req->sreq) { | |
196 | req->sreq->hba_private = NULL; | |
197 | scsi_req_unref(req->sreq); | |
198 | } | |
199 | g_free(req); | |
200 | virtio_notify(&s->vdev, vq); | |
201 | } | |
202 | ||
203 | static void virtio_scsi_bad_req(void) | |
204 | { | |
205 | error_report("wrong size for virtio-scsi headers"); | |
206 | exit(1); | |
207 | } | |
208 | ||
209 | static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg, | |
210 | target_phys_addr_t *addr, int num) | |
211 | { | |
212 | memset(qsgl, 0, sizeof(*qsgl)); | |
213 | while (num--) { | |
214 | qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len); | |
215 | } | |
216 | } | |
217 | ||
218 | static void virtio_scsi_parse_req(VirtIOSCSI *s, VirtQueue *vq, | |
219 | VirtIOSCSIReq *req) | |
220 | { | |
b6866fee | 221 | assert(req->elem.in_num); |
326799c0 SH |
222 | req->vq = vq; |
223 | req->dev = s; | |
224 | req->sreq = NULL; | |
b6866fee CM |
225 | if (req->elem.out_num) { |
226 | req->req.buf = req->elem.out_sg[0].iov_base; | |
227 | } | |
326799c0 SH |
228 | req->resp.buf = req->elem.in_sg[0].iov_base; |
229 | ||
230 | if (req->elem.out_num > 1) { | |
231 | qemu_sgl_init_external(&req->qsgl, &req->elem.out_sg[1], | |
232 | &req->elem.out_addr[1], | |
233 | req->elem.out_num - 1); | |
234 | } else { | |
235 | qemu_sgl_init_external(&req->qsgl, &req->elem.in_sg[1], | |
236 | &req->elem.in_addr[1], | |
237 | req->elem.in_num - 1); | |
238 | } | |
239 | } | |
240 | ||
241 | static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq) | |
242 | { | |
243 | VirtIOSCSIReq *req; | |
244 | req = g_malloc(sizeof(*req)); | |
245 | if (!virtqueue_pop(vq, &req->elem)) { | |
246 | g_free(req); | |
247 | return NULL; | |
248 | } | |
249 | ||
250 | virtio_scsi_parse_req(s, vq, req); | |
251 | return req; | |
252 | } | |
253 | ||
5db1764c PB |
254 | static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq) |
255 | { | |
256 | VirtIOSCSIReq *req = sreq->hba_private; | |
d2ad7dd4 | 257 | uint32_t n = virtio_queue_get_id(req->vq) - 2; |
5db1764c | 258 | |
d2ad7dd4 | 259 | assert(n < req->dev->conf->num_queues); |
fcf104a7 | 260 | qemu_put_be32s(f, &n); |
5db1764c PB |
261 | qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem)); |
262 | } | |
263 | ||
264 | static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq) | |
265 | { | |
266 | SCSIBus *bus = sreq->bus; | |
267 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); | |
268 | VirtIOSCSIReq *req; | |
fcf104a7 | 269 | uint32_t n; |
5db1764c PB |
270 | |
271 | req = g_malloc(sizeof(*req)); | |
fcf104a7 | 272 | qemu_get_be32s(f, &n); |
d2ad7dd4 | 273 | assert(n < s->conf->num_queues); |
5db1764c | 274 | qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem)); |
d2ad7dd4 | 275 | virtio_scsi_parse_req(s, s->cmd_vqs[n], req); |
5db1764c PB |
276 | |
277 | scsi_req_ref(sreq); | |
278 | req->sreq = sreq; | |
279 | if (req->sreq->cmd.mode != SCSI_XFER_NONE) { | |
280 | int req_mode = | |
281 | (req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV); | |
282 | ||
283 | assert(req->sreq->cmd.mode == req_mode); | |
284 | } | |
285 | return req; | |
286 | } | |
287 | ||
06114d72 | 288 | static void virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) |
326799c0 | 289 | { |
06114d72 PB |
290 | SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf->lun); |
291 | SCSIRequest *r, *next; | |
0866aca1 | 292 | BusChild *kid; |
06114d72 PB |
293 | int target; |
294 | ||
295 | /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */ | |
296 | req->resp.tmf->response = VIRTIO_SCSI_S_OK; | |
297 | ||
298 | switch (req->req.tmf->subtype) { | |
299 | case VIRTIO_SCSI_T_TMF_ABORT_TASK: | |
300 | case VIRTIO_SCSI_T_TMF_QUERY_TASK: | |
301 | if (!d) { | |
302 | goto fail; | |
303 | } | |
304 | if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) { | |
305 | goto incorrect_lun; | |
306 | } | |
307 | QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { | |
4dd7c82c PB |
308 | VirtIOSCSIReq *cmd_req = r->hba_private; |
309 | if (cmd_req && cmd_req->req.cmd->tag == req->req.tmf->tag) { | |
06114d72 PB |
310 | break; |
311 | } | |
312 | } | |
4dd7c82c PB |
313 | if (r) { |
314 | /* | |
315 | * Assert that the request has not been completed yet, we | |
316 | * check for it in the loop above. | |
317 | */ | |
318 | assert(r->hba_private); | |
06114d72 PB |
319 | if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) { |
320 | /* "If the specified command is present in the task set, then | |
321 | * return a service response set to FUNCTION SUCCEEDED". | |
322 | */ | |
323 | req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; | |
324 | } else { | |
325 | scsi_req_cancel(r); | |
326 | } | |
327 | } | |
328 | break; | |
329 | ||
330 | case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: | |
331 | if (!d) { | |
332 | goto fail; | |
333 | } | |
334 | if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) { | |
335 | goto incorrect_lun; | |
336 | } | |
337 | s->resetting++; | |
338 | qdev_reset_all(&d->qdev); | |
339 | s->resetting--; | |
340 | break; | |
341 | ||
342 | case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: | |
343 | case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: | |
344 | case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET: | |
345 | if (!d) { | |
346 | goto fail; | |
347 | } | |
348 | if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) { | |
349 | goto incorrect_lun; | |
350 | } | |
351 | QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { | |
352 | if (r->hba_private) { | |
353 | if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) { | |
354 | /* "If there is any command present in the task set, then | |
355 | * return a service response set to FUNCTION SUCCEEDED". | |
356 | */ | |
357 | req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; | |
358 | break; | |
359 | } else { | |
360 | scsi_req_cancel(r); | |
361 | } | |
362 | } | |
363 | } | |
364 | break; | |
365 | ||
366 | case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: | |
367 | target = req->req.tmf->lun[1]; | |
368 | s->resetting++; | |
0866aca1 AL |
369 | QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { |
370 | d = DO_UPCAST(SCSIDevice, qdev, kid->child); | |
06114d72 PB |
371 | if (d->channel == 0 && d->id == target) { |
372 | qdev_reset_all(&d->qdev); | |
373 | } | |
374 | } | |
375 | s->resetting--; | |
376 | break; | |
377 | ||
378 | case VIRTIO_SCSI_T_TMF_CLEAR_ACA: | |
379 | default: | |
380 | req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_REJECTED; | |
381 | break; | |
326799c0 SH |
382 | } |
383 | ||
06114d72 PB |
384 | return; |
385 | ||
386 | incorrect_lun: | |
387 | req->resp.tmf->response = VIRTIO_SCSI_S_INCORRECT_LUN; | |
388 | return; | |
389 | ||
390 | fail: | |
391 | req->resp.tmf->response = VIRTIO_SCSI_S_BAD_TARGET; | |
326799c0 SH |
392 | } |
393 | ||
973abc7f SH |
394 | static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
395 | { | |
326799c0 SH |
396 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
397 | VirtIOSCSIReq *req; | |
398 | ||
399 | while ((req = virtio_scsi_pop_req(s, vq))) { | |
06114d72 PB |
400 | int out_size, in_size; |
401 | if (req->elem.out_num < 1 || req->elem.in_num < 1) { | |
402 | virtio_scsi_bad_req(); | |
403 | continue; | |
404 | } | |
405 | ||
406 | out_size = req->elem.out_sg[0].iov_len; | |
407 | in_size = req->elem.in_sg[0].iov_len; | |
408 | if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) { | |
409 | if (out_size < sizeof(VirtIOSCSICtrlTMFReq) || | |
410 | in_size < sizeof(VirtIOSCSICtrlTMFResp)) { | |
411 | virtio_scsi_bad_req(); | |
412 | } | |
413 | virtio_scsi_do_tmf(s, req); | |
414 | ||
415 | } else if (req->req.tmf->type == VIRTIO_SCSI_T_AN_QUERY || | |
416 | req->req.tmf->type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { | |
417 | if (out_size < sizeof(VirtIOSCSICtrlANReq) || | |
418 | in_size < sizeof(VirtIOSCSICtrlANResp)) { | |
419 | virtio_scsi_bad_req(); | |
420 | } | |
421 | req->resp.an->event_actual = 0; | |
422 | req->resp.an->response = VIRTIO_SCSI_S_OK; | |
423 | } | |
424 | virtio_scsi_complete_req(req); | |
326799c0 SH |
425 | } |
426 | } | |
427 | ||
2ccdcd8d PB |
428 | static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status, |
429 | size_t resid) | |
430 | { | |
431 | VirtIOSCSIReq *req = r->hba_private; | |
432 | ||
433 | req->resp.cmd->response = VIRTIO_SCSI_S_OK; | |
434 | req->resp.cmd->status = status; | |
435 | if (req->resp.cmd->status == GOOD) { | |
436 | req->resp.cmd->resid = resid; | |
437 | } else { | |
438 | req->resp.cmd->resid = 0; | |
439 | req->resp.cmd->sense_len = | |
440 | scsi_req_get_sense(r, req->resp.cmd->sense, VIRTIO_SCSI_SENSE_SIZE); | |
441 | } | |
442 | virtio_scsi_complete_req(req); | |
443 | } | |
444 | ||
445 | static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r) | |
446 | { | |
447 | VirtIOSCSIReq *req = r->hba_private; | |
448 | ||
449 | return &req->qsgl; | |
450 | } | |
451 | ||
452 | static void virtio_scsi_request_cancelled(SCSIRequest *r) | |
453 | { | |
454 | VirtIOSCSIReq *req = r->hba_private; | |
455 | ||
456 | if (!req) { | |
457 | return; | |
458 | } | |
06114d72 PB |
459 | if (req->dev->resetting) { |
460 | req->resp.cmd->response = VIRTIO_SCSI_S_RESET; | |
461 | } else { | |
462 | req->resp.cmd->response = VIRTIO_SCSI_S_ABORTED; | |
463 | } | |
2ccdcd8d PB |
464 | virtio_scsi_complete_req(req); |
465 | } | |
466 | ||
467 | static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) | |
326799c0 SH |
468 | { |
469 | req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE; | |
470 | virtio_scsi_complete_req(req); | |
973abc7f SH |
471 | } |
472 | ||
473 | static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) | |
474 | { | |
326799c0 SH |
475 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
476 | VirtIOSCSIReq *req; | |
2ccdcd8d | 477 | int n; |
326799c0 SH |
478 | |
479 | while ((req = virtio_scsi_pop_req(s, vq))) { | |
2ccdcd8d | 480 | SCSIDevice *d; |
326799c0 SH |
481 | int out_size, in_size; |
482 | if (req->elem.out_num < 1 || req->elem.in_num < 1) { | |
483 | virtio_scsi_bad_req(); | |
484 | } | |
485 | ||
486 | out_size = req->elem.out_sg[0].iov_len; | |
487 | in_size = req->elem.in_sg[0].iov_len; | |
488 | if (out_size < sizeof(VirtIOSCSICmdReq) + s->cdb_size || | |
489 | in_size < sizeof(VirtIOSCSICmdResp) + s->sense_size) { | |
490 | virtio_scsi_bad_req(); | |
491 | } | |
492 | ||
493 | if (req->elem.out_num > 1 && req->elem.in_num > 1) { | |
2ccdcd8d | 494 | virtio_scsi_fail_cmd_req(req); |
326799c0 SH |
495 | continue; |
496 | } | |
497 | ||
2ccdcd8d PB |
498 | d = virtio_scsi_device_find(s, req->req.cmd->lun); |
499 | if (!d) { | |
500 | req->resp.cmd->response = VIRTIO_SCSI_S_BAD_TARGET; | |
501 | virtio_scsi_complete_req(req); | |
502 | continue; | |
503 | } | |
504 | req->sreq = scsi_req_new(d, req->req.cmd->tag, | |
505 | virtio_scsi_get_lun(req->req.cmd->lun), | |
506 | req->req.cmd->cdb, req); | |
507 | ||
508 | if (req->sreq->cmd.mode != SCSI_XFER_NONE) { | |
509 | int req_mode = | |
510 | (req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV); | |
511 | ||
512 | if (req->sreq->cmd.mode != req_mode || | |
513 | req->sreq->cmd.xfer > req->qsgl.size) { | |
514 | req->resp.cmd->response = VIRTIO_SCSI_S_OVERRUN; | |
515 | virtio_scsi_complete_req(req); | |
516 | continue; | |
517 | } | |
518 | } | |
519 | ||
520 | n = scsi_req_enqueue(req->sreq); | |
521 | if (n) { | |
522 | scsi_req_continue(req->sreq); | |
523 | } | |
326799c0 | 524 | } |
973abc7f SH |
525 | } |
526 | ||
527 | static void virtio_scsi_get_config(VirtIODevice *vdev, | |
528 | uint8_t *config) | |
529 | { | |
530 | VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; | |
531 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; | |
532 | ||
533 | stl_raw(&scsiconf->num_queues, s->conf->num_queues); | |
534 | stl_raw(&scsiconf->seg_max, 128 - 2); | |
535 | stl_raw(&scsiconf->max_sectors, s->conf->max_sectors); | |
536 | stl_raw(&scsiconf->cmd_per_lun, s->conf->cmd_per_lun); | |
537 | stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent)); | |
538 | stl_raw(&scsiconf->sense_size, s->sense_size); | |
539 | stl_raw(&scsiconf->cdb_size, s->cdb_size); | |
540 | stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); | |
541 | stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); | |
542 | stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); | |
543 | } | |
544 | ||
545 | static void virtio_scsi_set_config(VirtIODevice *vdev, | |
546 | const uint8_t *config) | |
547 | { | |
548 | VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; | |
549 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; | |
550 | ||
551 | if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 || | |
552 | (uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) { | |
553 | error_report("bad data written to virtio-scsi configuration space"); | |
554 | exit(1); | |
555 | } | |
556 | ||
557 | s->sense_size = ldl_raw(&scsiconf->sense_size); | |
558 | s->cdb_size = ldl_raw(&scsiconf->cdb_size); | |
559 | } | |
560 | ||
561 | static uint32_t virtio_scsi_get_features(VirtIODevice *vdev, | |
562 | uint32_t requested_features) | |
563 | { | |
b6866fee | 564 | requested_features |= (1UL << VIRTIO_SCSI_F_HOTPLUG); |
feda01e4 | 565 | requested_features |= (1UL << VIRTIO_SCSI_F_CHANGE); |
973abc7f SH |
566 | return requested_features; |
567 | } | |
568 | ||
569 | static void virtio_scsi_reset(VirtIODevice *vdev) | |
570 | { | |
571 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; | |
572 | ||
573 | s->sense_size = VIRTIO_SCSI_SENSE_SIZE; | |
574 | s->cdb_size = VIRTIO_SCSI_CDB_SIZE; | |
2baa1beb | 575 | s->events_dropped = false; |
973abc7f SH |
576 | } |
577 | ||
5db1764c PB |
578 | /* The device does not have anything to save beyond the virtio data. |
579 | * Request data is saved with callbacks from SCSI devices. | |
580 | */ | |
581 | static void virtio_scsi_save(QEMUFile *f, void *opaque) | |
582 | { | |
583 | VirtIOSCSI *s = opaque; | |
584 | virtio_save(&s->vdev, f); | |
585 | } | |
586 | ||
587 | static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id) | |
588 | { | |
589 | VirtIOSCSI *s = opaque; | |
2a633c46 OW |
590 | int ret; |
591 | ||
592 | ret = virtio_load(&s->vdev, f); | |
593 | if (ret) { | |
594 | return ret; | |
595 | } | |
5db1764c PB |
596 | return 0; |
597 | } | |
598 | ||
b6866fee CM |
599 | static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, |
600 | uint32_t event, uint32_t reason) | |
601 | { | |
602 | VirtIOSCSIReq *req = virtio_scsi_pop_req(s, s->event_vq); | |
603 | VirtIOSCSIEvent *evt; | |
64f64855 | 604 | int in_size; |
b6866fee | 605 | |
64f64855 PB |
606 | if (!req) { |
607 | s->events_dropped = true; | |
608 | return; | |
609 | } | |
b6866fee | 610 | |
64f64855 PB |
611 | if (req->elem.out_num || req->elem.in_num != 1) { |
612 | virtio_scsi_bad_req(); | |
613 | } | |
b6866fee | 614 | |
64f64855 PB |
615 | if (s->events_dropped) { |
616 | event |= VIRTIO_SCSI_T_EVENTS_MISSED; | |
617 | s->events_dropped = false; | |
618 | } | |
619 | ||
620 | in_size = req->elem.in_sg[0].iov_len; | |
621 | if (in_size < sizeof(VirtIOSCSIEvent)) { | |
622 | virtio_scsi_bad_req(); | |
623 | } | |
624 | ||
625 | evt = req->resp.event; | |
626 | memset(evt, 0, sizeof(VirtIOSCSIEvent)); | |
627 | evt->event = event; | |
628 | evt->reason = reason; | |
629 | if (!dev) { | |
630 | assert(event == VIRTIO_SCSI_T_NO_EVENT); | |
631 | } else { | |
b6866fee CM |
632 | evt->lun[0] = 1; |
633 | evt->lun[1] = dev->id; | |
634 | ||
635 | /* Linux wants us to keep the same encoding we use for REPORT LUNS. */ | |
636 | if (dev->lun >= 256) { | |
637 | evt->lun[2] = (dev->lun >> 8) | 0x40; | |
638 | } | |
639 | evt->lun[3] = dev->lun & 0xFF; | |
64f64855 PB |
640 | } |
641 | virtio_scsi_complete_req(req); | |
642 | } | |
643 | ||
644 | static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) | |
645 | { | |
646 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; | |
647 | ||
648 | if (s->events_dropped) { | |
649 | virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); | |
b6866fee CM |
650 | } |
651 | } | |
652 | ||
feda01e4 PB |
653 | static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) |
654 | { | |
655 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); | |
656 | ||
657 | if (((s->vdev.guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) && | |
658 | (s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) && | |
659 | dev->type != TYPE_ROM) { | |
660 | virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE, | |
661 | sense.asc | (sense.ascq << 8)); | |
662 | } | |
663 | } | |
664 | ||
b6866fee CM |
665 | static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev) |
666 | { | |
667 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); | |
668 | ||
669 | if (((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) && | |
670 | (s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { | |
671 | virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, | |
672 | VIRTIO_SCSI_EVT_RESET_RESCAN); | |
673 | } | |
674 | } | |
675 | ||
676 | static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev) | |
677 | { | |
678 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); | |
679 | ||
680 | if ((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) { | |
681 | virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, | |
682 | VIRTIO_SCSI_EVT_RESET_REMOVED); | |
683 | } | |
684 | } | |
685 | ||
2ccdcd8d PB |
686 | static struct SCSIBusInfo virtio_scsi_scsi_info = { |
687 | .tcq = true, | |
688 | .max_channel = VIRTIO_SCSI_MAX_CHANNEL, | |
689 | .max_target = VIRTIO_SCSI_MAX_TARGET, | |
690 | .max_lun = VIRTIO_SCSI_MAX_LUN, | |
691 | ||
692 | .complete = virtio_scsi_command_complete, | |
693 | .cancel = virtio_scsi_request_cancelled, | |
feda01e4 | 694 | .change = virtio_scsi_change, |
b6866fee CM |
695 | .hotplug = virtio_scsi_hotplug, |
696 | .hot_unplug = virtio_scsi_hot_unplug, | |
2ccdcd8d | 697 | .get_sg_list = virtio_scsi_get_sg_list, |
5db1764c PB |
698 | .save_request = virtio_scsi_save_request, |
699 | .load_request = virtio_scsi_load_request, | |
2ccdcd8d PB |
700 | }; |
701 | ||
973abc7f SH |
702 | VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf) |
703 | { | |
704 | VirtIOSCSI *s; | |
5db1764c | 705 | static int virtio_scsi_id; |
d2ad7dd4 PB |
706 | size_t sz; |
707 | int i; | |
973abc7f | 708 | |
d2ad7dd4 | 709 | sz = sizeof(VirtIOSCSI) + proxyconf->num_queues * sizeof(VirtQueue *); |
973abc7f | 710 | s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI, |
d2ad7dd4 | 711 | sizeof(VirtIOSCSIConfig), sz); |
973abc7f SH |
712 | |
713 | s->qdev = dev; | |
714 | s->conf = proxyconf; | |
715 | ||
716 | /* TODO set up vdev function pointers */ | |
717 | s->vdev.get_config = virtio_scsi_get_config; | |
718 | s->vdev.set_config = virtio_scsi_set_config; | |
719 | s->vdev.get_features = virtio_scsi_get_features; | |
720 | s->vdev.reset = virtio_scsi_reset; | |
721 | ||
722 | s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, | |
723 | virtio_scsi_handle_ctrl); | |
724 | s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, | |
619d7ae9 | 725 | virtio_scsi_handle_event); |
d2ad7dd4 PB |
726 | for (i = 0; i < s->conf->num_queues; i++) { |
727 | s->cmd_vqs[i] = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, | |
728 | virtio_scsi_handle_cmd); | |
729 | } | |
973abc7f | 730 | |
2ccdcd8d PB |
731 | scsi_bus_new(&s->bus, dev, &virtio_scsi_scsi_info); |
732 | if (!dev->hotplugged) { | |
733 | scsi_bus_legacy_handle_cmdline(&s->bus); | |
734 | } | |
735 | ||
5db1764c PB |
736 | register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1, |
737 | virtio_scsi_save, virtio_scsi_load, s); | |
973abc7f SH |
738 | |
739 | return &s->vdev; | |
740 | } | |
741 | ||
742 | void virtio_scsi_exit(VirtIODevice *vdev) | |
743 | { | |
eb2fa764 PB |
744 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
745 | unregister_savevm(s->qdev, "virtio-scsi", s); | |
973abc7f SH |
746 | virtio_cleanup(vdev); |
747 | } |