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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) { | |
308 | if (r->tag == req->req.tmf->tag) { | |
309 | break; | |
310 | } | |
311 | } | |
312 | if (r && r->hba_private) { | |
313 | if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) { | |
314 | /* "If the specified command is present in the task set, then | |
315 | * return a service response set to FUNCTION SUCCEEDED". | |
316 | */ | |
317 | req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; | |
318 | } else { | |
319 | scsi_req_cancel(r); | |
320 | } | |
321 | } | |
322 | break; | |
323 | ||
324 | case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: | |
325 | if (!d) { | |
326 | goto fail; | |
327 | } | |
328 | if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) { | |
329 | goto incorrect_lun; | |
330 | } | |
331 | s->resetting++; | |
332 | qdev_reset_all(&d->qdev); | |
333 | s->resetting--; | |
334 | break; | |
335 | ||
336 | case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: | |
337 | case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: | |
338 | case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET: | |
339 | if (!d) { | |
340 | goto fail; | |
341 | } | |
342 | if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) { | |
343 | goto incorrect_lun; | |
344 | } | |
345 | QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { | |
346 | if (r->hba_private) { | |
347 | if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) { | |
348 | /* "If there is any command present in the task set, then | |
349 | * return a service response set to FUNCTION SUCCEEDED". | |
350 | */ | |
351 | req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; | |
352 | break; | |
353 | } else { | |
354 | scsi_req_cancel(r); | |
355 | } | |
356 | } | |
357 | } | |
358 | break; | |
359 | ||
360 | case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: | |
361 | target = req->req.tmf->lun[1]; | |
362 | s->resetting++; | |
0866aca1 AL |
363 | QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { |
364 | d = DO_UPCAST(SCSIDevice, qdev, kid->child); | |
06114d72 PB |
365 | if (d->channel == 0 && d->id == target) { |
366 | qdev_reset_all(&d->qdev); | |
367 | } | |
368 | } | |
369 | s->resetting--; | |
370 | break; | |
371 | ||
372 | case VIRTIO_SCSI_T_TMF_CLEAR_ACA: | |
373 | default: | |
374 | req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_REJECTED; | |
375 | break; | |
326799c0 SH |
376 | } |
377 | ||
06114d72 PB |
378 | return; |
379 | ||
380 | incorrect_lun: | |
381 | req->resp.tmf->response = VIRTIO_SCSI_S_INCORRECT_LUN; | |
382 | return; | |
383 | ||
384 | fail: | |
385 | req->resp.tmf->response = VIRTIO_SCSI_S_BAD_TARGET; | |
326799c0 SH |
386 | } |
387 | ||
973abc7f SH |
388 | static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
389 | { | |
326799c0 SH |
390 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
391 | VirtIOSCSIReq *req; | |
392 | ||
393 | while ((req = virtio_scsi_pop_req(s, vq))) { | |
06114d72 PB |
394 | int out_size, in_size; |
395 | if (req->elem.out_num < 1 || req->elem.in_num < 1) { | |
396 | virtio_scsi_bad_req(); | |
397 | continue; | |
398 | } | |
399 | ||
400 | out_size = req->elem.out_sg[0].iov_len; | |
401 | in_size = req->elem.in_sg[0].iov_len; | |
402 | if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) { | |
403 | if (out_size < sizeof(VirtIOSCSICtrlTMFReq) || | |
404 | in_size < sizeof(VirtIOSCSICtrlTMFResp)) { | |
405 | virtio_scsi_bad_req(); | |
406 | } | |
407 | virtio_scsi_do_tmf(s, req); | |
408 | ||
409 | } else if (req->req.tmf->type == VIRTIO_SCSI_T_AN_QUERY || | |
410 | req->req.tmf->type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { | |
411 | if (out_size < sizeof(VirtIOSCSICtrlANReq) || | |
412 | in_size < sizeof(VirtIOSCSICtrlANResp)) { | |
413 | virtio_scsi_bad_req(); | |
414 | } | |
415 | req->resp.an->event_actual = 0; | |
416 | req->resp.an->response = VIRTIO_SCSI_S_OK; | |
417 | } | |
418 | virtio_scsi_complete_req(req); | |
326799c0 SH |
419 | } |
420 | } | |
421 | ||
2ccdcd8d PB |
422 | static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status, |
423 | size_t resid) | |
424 | { | |
425 | VirtIOSCSIReq *req = r->hba_private; | |
426 | ||
427 | req->resp.cmd->response = VIRTIO_SCSI_S_OK; | |
428 | req->resp.cmd->status = status; | |
429 | if (req->resp.cmd->status == GOOD) { | |
430 | req->resp.cmd->resid = resid; | |
431 | } else { | |
432 | req->resp.cmd->resid = 0; | |
433 | req->resp.cmd->sense_len = | |
434 | scsi_req_get_sense(r, req->resp.cmd->sense, VIRTIO_SCSI_SENSE_SIZE); | |
435 | } | |
436 | virtio_scsi_complete_req(req); | |
437 | } | |
438 | ||
439 | static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r) | |
440 | { | |
441 | VirtIOSCSIReq *req = r->hba_private; | |
442 | ||
443 | return &req->qsgl; | |
444 | } | |
445 | ||
446 | static void virtio_scsi_request_cancelled(SCSIRequest *r) | |
447 | { | |
448 | VirtIOSCSIReq *req = r->hba_private; | |
449 | ||
450 | if (!req) { | |
451 | return; | |
452 | } | |
06114d72 PB |
453 | if (req->dev->resetting) { |
454 | req->resp.cmd->response = VIRTIO_SCSI_S_RESET; | |
455 | } else { | |
456 | req->resp.cmd->response = VIRTIO_SCSI_S_ABORTED; | |
457 | } | |
2ccdcd8d PB |
458 | virtio_scsi_complete_req(req); |
459 | } | |
460 | ||
461 | static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) | |
326799c0 SH |
462 | { |
463 | req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE; | |
464 | virtio_scsi_complete_req(req); | |
973abc7f SH |
465 | } |
466 | ||
467 | static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) | |
468 | { | |
326799c0 SH |
469 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
470 | VirtIOSCSIReq *req; | |
2ccdcd8d | 471 | int n; |
326799c0 SH |
472 | |
473 | while ((req = virtio_scsi_pop_req(s, vq))) { | |
2ccdcd8d | 474 | SCSIDevice *d; |
326799c0 SH |
475 | int out_size, in_size; |
476 | if (req->elem.out_num < 1 || req->elem.in_num < 1) { | |
477 | virtio_scsi_bad_req(); | |
478 | } | |
479 | ||
480 | out_size = req->elem.out_sg[0].iov_len; | |
481 | in_size = req->elem.in_sg[0].iov_len; | |
482 | if (out_size < sizeof(VirtIOSCSICmdReq) + s->cdb_size || | |
483 | in_size < sizeof(VirtIOSCSICmdResp) + s->sense_size) { | |
484 | virtio_scsi_bad_req(); | |
485 | } | |
486 | ||
487 | if (req->elem.out_num > 1 && req->elem.in_num > 1) { | |
2ccdcd8d | 488 | virtio_scsi_fail_cmd_req(req); |
326799c0 SH |
489 | continue; |
490 | } | |
491 | ||
2ccdcd8d PB |
492 | d = virtio_scsi_device_find(s, req->req.cmd->lun); |
493 | if (!d) { | |
494 | req->resp.cmd->response = VIRTIO_SCSI_S_BAD_TARGET; | |
495 | virtio_scsi_complete_req(req); | |
496 | continue; | |
497 | } | |
498 | req->sreq = scsi_req_new(d, req->req.cmd->tag, | |
499 | virtio_scsi_get_lun(req->req.cmd->lun), | |
500 | req->req.cmd->cdb, req); | |
501 | ||
502 | if (req->sreq->cmd.mode != SCSI_XFER_NONE) { | |
503 | int req_mode = | |
504 | (req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV); | |
505 | ||
506 | if (req->sreq->cmd.mode != req_mode || | |
507 | req->sreq->cmd.xfer > req->qsgl.size) { | |
508 | req->resp.cmd->response = VIRTIO_SCSI_S_OVERRUN; | |
509 | virtio_scsi_complete_req(req); | |
510 | continue; | |
511 | } | |
512 | } | |
513 | ||
514 | n = scsi_req_enqueue(req->sreq); | |
515 | if (n) { | |
516 | scsi_req_continue(req->sreq); | |
517 | } | |
326799c0 | 518 | } |
973abc7f SH |
519 | } |
520 | ||
521 | static void virtio_scsi_get_config(VirtIODevice *vdev, | |
522 | uint8_t *config) | |
523 | { | |
524 | VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; | |
525 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; | |
526 | ||
527 | stl_raw(&scsiconf->num_queues, s->conf->num_queues); | |
528 | stl_raw(&scsiconf->seg_max, 128 - 2); | |
529 | stl_raw(&scsiconf->max_sectors, s->conf->max_sectors); | |
530 | stl_raw(&scsiconf->cmd_per_lun, s->conf->cmd_per_lun); | |
531 | stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent)); | |
532 | stl_raw(&scsiconf->sense_size, s->sense_size); | |
533 | stl_raw(&scsiconf->cdb_size, s->cdb_size); | |
534 | stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); | |
535 | stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); | |
536 | stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); | |
537 | } | |
538 | ||
539 | static void virtio_scsi_set_config(VirtIODevice *vdev, | |
540 | const uint8_t *config) | |
541 | { | |
542 | VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; | |
543 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; | |
544 | ||
545 | if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 || | |
546 | (uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) { | |
547 | error_report("bad data written to virtio-scsi configuration space"); | |
548 | exit(1); | |
549 | } | |
550 | ||
551 | s->sense_size = ldl_raw(&scsiconf->sense_size); | |
552 | s->cdb_size = ldl_raw(&scsiconf->cdb_size); | |
553 | } | |
554 | ||
555 | static uint32_t virtio_scsi_get_features(VirtIODevice *vdev, | |
556 | uint32_t requested_features) | |
557 | { | |
b6866fee | 558 | requested_features |= (1UL << VIRTIO_SCSI_F_HOTPLUG); |
feda01e4 | 559 | requested_features |= (1UL << VIRTIO_SCSI_F_CHANGE); |
973abc7f SH |
560 | return requested_features; |
561 | } | |
562 | ||
563 | static void virtio_scsi_reset(VirtIODevice *vdev) | |
564 | { | |
565 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; | |
566 | ||
567 | s->sense_size = VIRTIO_SCSI_SENSE_SIZE; | |
568 | s->cdb_size = VIRTIO_SCSI_CDB_SIZE; | |
2baa1beb | 569 | s->events_dropped = false; |
973abc7f SH |
570 | } |
571 | ||
5db1764c PB |
572 | /* The device does not have anything to save beyond the virtio data. |
573 | * Request data is saved with callbacks from SCSI devices. | |
574 | */ | |
575 | static void virtio_scsi_save(QEMUFile *f, void *opaque) | |
576 | { | |
577 | VirtIOSCSI *s = opaque; | |
578 | virtio_save(&s->vdev, f); | |
579 | } | |
580 | ||
581 | static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id) | |
582 | { | |
583 | VirtIOSCSI *s = opaque; | |
2a633c46 OW |
584 | int ret; |
585 | ||
586 | ret = virtio_load(&s->vdev, f); | |
587 | if (ret) { | |
588 | return ret; | |
589 | } | |
5db1764c PB |
590 | return 0; |
591 | } | |
592 | ||
b6866fee CM |
593 | static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, |
594 | uint32_t event, uint32_t reason) | |
595 | { | |
596 | VirtIOSCSIReq *req = virtio_scsi_pop_req(s, s->event_vq); | |
597 | VirtIOSCSIEvent *evt; | |
64f64855 | 598 | int in_size; |
b6866fee | 599 | |
64f64855 PB |
600 | if (!req) { |
601 | s->events_dropped = true; | |
602 | return; | |
603 | } | |
b6866fee | 604 | |
64f64855 PB |
605 | if (req->elem.out_num || req->elem.in_num != 1) { |
606 | virtio_scsi_bad_req(); | |
607 | } | |
b6866fee | 608 | |
64f64855 PB |
609 | if (s->events_dropped) { |
610 | event |= VIRTIO_SCSI_T_EVENTS_MISSED; | |
611 | s->events_dropped = false; | |
612 | } | |
613 | ||
614 | in_size = req->elem.in_sg[0].iov_len; | |
615 | if (in_size < sizeof(VirtIOSCSIEvent)) { | |
616 | virtio_scsi_bad_req(); | |
617 | } | |
618 | ||
619 | evt = req->resp.event; | |
620 | memset(evt, 0, sizeof(VirtIOSCSIEvent)); | |
621 | evt->event = event; | |
622 | evt->reason = reason; | |
623 | if (!dev) { | |
624 | assert(event == VIRTIO_SCSI_T_NO_EVENT); | |
625 | } else { | |
b6866fee CM |
626 | evt->lun[0] = 1; |
627 | evt->lun[1] = dev->id; | |
628 | ||
629 | /* Linux wants us to keep the same encoding we use for REPORT LUNS. */ | |
630 | if (dev->lun >= 256) { | |
631 | evt->lun[2] = (dev->lun >> 8) | 0x40; | |
632 | } | |
633 | evt->lun[3] = dev->lun & 0xFF; | |
64f64855 PB |
634 | } |
635 | virtio_scsi_complete_req(req); | |
636 | } | |
637 | ||
638 | static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) | |
639 | { | |
640 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; | |
641 | ||
642 | if (s->events_dropped) { | |
643 | virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); | |
b6866fee CM |
644 | } |
645 | } | |
646 | ||
feda01e4 PB |
647 | static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) |
648 | { | |
649 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); | |
650 | ||
651 | if (((s->vdev.guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) && | |
652 | (s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) && | |
653 | dev->type != TYPE_ROM) { | |
654 | virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE, | |
655 | sense.asc | (sense.ascq << 8)); | |
656 | } | |
657 | } | |
658 | ||
b6866fee CM |
659 | static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev) |
660 | { | |
661 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); | |
662 | ||
663 | if (((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) && | |
664 | (s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { | |
665 | virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, | |
666 | VIRTIO_SCSI_EVT_RESET_RESCAN); | |
667 | } | |
668 | } | |
669 | ||
670 | static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev) | |
671 | { | |
672 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); | |
673 | ||
674 | if ((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) { | |
675 | virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, | |
676 | VIRTIO_SCSI_EVT_RESET_REMOVED); | |
677 | } | |
678 | } | |
679 | ||
2ccdcd8d PB |
680 | static struct SCSIBusInfo virtio_scsi_scsi_info = { |
681 | .tcq = true, | |
682 | .max_channel = VIRTIO_SCSI_MAX_CHANNEL, | |
683 | .max_target = VIRTIO_SCSI_MAX_TARGET, | |
684 | .max_lun = VIRTIO_SCSI_MAX_LUN, | |
685 | ||
686 | .complete = virtio_scsi_command_complete, | |
687 | .cancel = virtio_scsi_request_cancelled, | |
feda01e4 | 688 | .change = virtio_scsi_change, |
b6866fee CM |
689 | .hotplug = virtio_scsi_hotplug, |
690 | .hot_unplug = virtio_scsi_hot_unplug, | |
2ccdcd8d | 691 | .get_sg_list = virtio_scsi_get_sg_list, |
5db1764c PB |
692 | .save_request = virtio_scsi_save_request, |
693 | .load_request = virtio_scsi_load_request, | |
2ccdcd8d PB |
694 | }; |
695 | ||
973abc7f SH |
696 | VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf) |
697 | { | |
698 | VirtIOSCSI *s; | |
5db1764c | 699 | static int virtio_scsi_id; |
d2ad7dd4 PB |
700 | size_t sz; |
701 | int i; | |
973abc7f | 702 | |
d2ad7dd4 | 703 | sz = sizeof(VirtIOSCSI) + proxyconf->num_queues * sizeof(VirtQueue *); |
973abc7f | 704 | s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI, |
d2ad7dd4 | 705 | sizeof(VirtIOSCSIConfig), sz); |
973abc7f SH |
706 | |
707 | s->qdev = dev; | |
708 | s->conf = proxyconf; | |
709 | ||
710 | /* TODO set up vdev function pointers */ | |
711 | s->vdev.get_config = virtio_scsi_get_config; | |
712 | s->vdev.set_config = virtio_scsi_set_config; | |
713 | s->vdev.get_features = virtio_scsi_get_features; | |
714 | s->vdev.reset = virtio_scsi_reset; | |
715 | ||
716 | s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, | |
717 | virtio_scsi_handle_ctrl); | |
718 | s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, | |
619d7ae9 | 719 | virtio_scsi_handle_event); |
d2ad7dd4 PB |
720 | for (i = 0; i < s->conf->num_queues; i++) { |
721 | s->cmd_vqs[i] = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, | |
722 | virtio_scsi_handle_cmd); | |
723 | } | |
973abc7f | 724 | |
2ccdcd8d PB |
725 | scsi_bus_new(&s->bus, dev, &virtio_scsi_scsi_info); |
726 | if (!dev->hotplugged) { | |
727 | scsi_bus_legacy_handle_cmdline(&s->bus); | |
728 | } | |
729 | ||
5db1764c PB |
730 | register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1, |
731 | virtio_scsi_save, virtio_scsi_load, s); | |
973abc7f SH |
732 | |
733 | return &s->vdev; | |
734 | } | |
735 | ||
736 | void virtio_scsi_exit(VirtIODevice *vdev) | |
737 | { | |
eb2fa764 PB |
738 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
739 | unregister_savevm(s->qdev, "virtio-scsi", s); | |
973abc7f SH |
740 | virtio_cleanup(vdev); |
741 | } |