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Merge remote-tracking branch 'afaerber-or/cocoa-for-upstream' into staging
[qemu.git] / hw / scsi-bus.c
1 #include "hw.h"
2 #include "qemu-error.h"
3 #include "scsi.h"
4 #include "scsi-defs.h"
5 #include "qdev.h"
6 #include "blockdev.h"
7 #include "trace.h"
8 #include "dma.h"
9
10 static char *scsibus_get_dev_path(DeviceState *dev);
11 static char *scsibus_get_fw_dev_path(DeviceState *dev);
12 static int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf);
13 static void scsi_req_dequeue(SCSIRequest *req);
14
15 static struct BusInfo scsi_bus_info = {
16     .name  = "SCSI",
17     .size  = sizeof(SCSIBus),
18     .get_dev_path = scsibus_get_dev_path,
19     .get_fw_dev_path = scsibus_get_fw_dev_path,
20     .props = (Property[]) {
21         DEFINE_PROP_UINT32("channel", SCSIDevice, channel, 0),
22         DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
23         DEFINE_PROP_UINT32("lun", SCSIDevice, lun, -1),
24         DEFINE_PROP_END_OF_LIST(),
25     },
26 };
27 static int next_scsi_bus;
28
29 static int scsi_device_init(SCSIDevice *s)
30 {
31     SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
32     if (sc->init) {
33         return sc->init(s);
34     }
35     return 0;
36 }
37
38 static void scsi_device_destroy(SCSIDevice *s)
39 {
40     SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
41     if (sc->destroy) {
42         sc->destroy(s);
43     }
44 }
45
46 static SCSIRequest *scsi_device_alloc_req(SCSIDevice *s, uint32_t tag, uint32_t lun,
47                                           uint8_t *buf, void *hba_private)
48 {
49     SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
50     if (sc->alloc_req) {
51         return sc->alloc_req(s, tag, lun, buf, hba_private);
52     }
53
54     return NULL;
55 }
56
57 static void scsi_device_unit_attention_reported(SCSIDevice *s)
58 {
59     SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
60     if (sc->unit_attention_reported) {
61         sc->unit_attention_reported(s);
62     }
63 }
64
65 /* Create a scsi bus, and attach devices to it.  */
66 void scsi_bus_new(SCSIBus *bus, DeviceState *host, const SCSIBusInfo *info)
67 {
68     qbus_create_inplace(&bus->qbus, &scsi_bus_info, host, NULL);
69     bus->busnr = next_scsi_bus++;
70     bus->info = info;
71     bus->qbus.allow_hotplug = 1;
72 }
73
74 static void scsi_dma_restart_bh(void *opaque)
75 {
76     SCSIDevice *s = opaque;
77     SCSIRequest *req, *next;
78
79     qemu_bh_delete(s->bh);
80     s->bh = NULL;
81
82     QTAILQ_FOREACH_SAFE(req, &s->requests, next, next) {
83         scsi_req_ref(req);
84         if (req->retry) {
85             req->retry = false;
86             switch (req->cmd.mode) {
87             case SCSI_XFER_FROM_DEV:
88             case SCSI_XFER_TO_DEV:
89                 scsi_req_continue(req);
90                 break;
91             case SCSI_XFER_NONE:
92                 assert(!req->sg);
93                 scsi_req_dequeue(req);
94                 scsi_req_enqueue(req);
95                 break;
96             }
97         }
98         scsi_req_unref(req);
99     }
100 }
101
102 void scsi_req_retry(SCSIRequest *req)
103 {
104     /* No need to save a reference, because scsi_dma_restart_bh just
105      * looks at the request list.  */
106     req->retry = true;
107 }
108
109 static void scsi_dma_restart_cb(void *opaque, int running, RunState state)
110 {
111     SCSIDevice *s = opaque;
112
113     if (!running) {
114         return;
115     }
116     if (!s->bh) {
117         s->bh = qemu_bh_new(scsi_dma_restart_bh, s);
118         qemu_bh_schedule(s->bh);
119     }
120 }
121
122 static int scsi_qdev_init(DeviceState *qdev)
123 {
124     SCSIDevice *dev = SCSI_DEVICE(qdev);
125     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
126     SCSIDevice *d;
127     int rc = -1;
128
129     if (dev->channel > bus->info->max_channel) {
130         error_report("bad scsi channel id: %d", dev->channel);
131         goto err;
132     }
133     if (dev->id != -1 && dev->id > bus->info->max_target) {
134         error_report("bad scsi device id: %d", dev->id);
135         goto err;
136     }
137     if (dev->lun != -1 && dev->lun > bus->info->max_lun) {
138         error_report("bad scsi device lun: %d", dev->lun);
139         goto err;
140     }
141
142     if (dev->id == -1) {
143         int id = -1;
144         if (dev->lun == -1) {
145             dev->lun = 0;
146         }
147         do {
148             d = scsi_device_find(bus, dev->channel, ++id, dev->lun);
149         } while (d && d->lun == dev->lun && id < bus->info->max_target);
150         if (d && d->lun == dev->lun) {
151             error_report("no free target");
152             goto err;
153         }
154         dev->id = id;
155     } else if (dev->lun == -1) {
156         int lun = -1;
157         do {
158             d = scsi_device_find(bus, dev->channel, dev->id, ++lun);
159         } while (d && d->lun == lun && lun < bus->info->max_lun);
160         if (d && d->lun == lun) {
161             error_report("no free lun");
162             goto err;
163         }
164         dev->lun = lun;
165     } else {
166         d = scsi_device_find(bus, dev->channel, dev->id, dev->lun);
167         assert(d);
168         if (d->lun == dev->lun && dev != d) {
169             qdev_free(&d->qdev);
170         }
171     }
172
173     QTAILQ_INIT(&dev->requests);
174     rc = scsi_device_init(dev);
175     if (rc == 0) {
176         dev->vmsentry = qemu_add_vm_change_state_handler(scsi_dma_restart_cb,
177                                                          dev);
178     }
179
180 err:
181     return rc;
182 }
183
184 static int scsi_qdev_exit(DeviceState *qdev)
185 {
186     SCSIDevice *dev = SCSI_DEVICE(qdev);
187
188     if (dev->vmsentry) {
189         qemu_del_vm_change_state_handler(dev->vmsentry);
190     }
191     scsi_device_destroy(dev);
192     return 0;
193 }
194
195 /* handle legacy '-drive if=scsi,...' cmd line args */
196 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv,
197                                       int unit, bool removable, int bootindex)
198 {
199     const char *driver;
200     DeviceState *dev;
201
202     driver = bdrv_is_sg(bdrv) ? "scsi-generic" : "scsi-disk";
203     dev = qdev_create(&bus->qbus, driver);
204     qdev_prop_set_uint32(dev, "scsi-id", unit);
205     if (bootindex >= 0) {
206         qdev_prop_set_int32(dev, "bootindex", bootindex);
207     }
208     if (qdev_prop_exists(dev, "removable")) {
209         qdev_prop_set_bit(dev, "removable", removable);
210     }
211     if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
212         qdev_free(dev);
213         return NULL;
214     }
215     if (qdev_init(dev) < 0)
216         return NULL;
217     return SCSI_DEVICE(dev);
218 }
219
220 int scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
221 {
222     Location loc;
223     DriveInfo *dinfo;
224     int res = 0, unit;
225
226     loc_push_none(&loc);
227     for (unit = 0; unit <= bus->info->max_target; unit++) {
228         dinfo = drive_get(IF_SCSI, bus->busnr, unit);
229         if (dinfo == NULL) {
230             continue;
231         }
232         qemu_opts_loc_restore(dinfo->opts);
233         if (!scsi_bus_legacy_add_drive(bus, dinfo->bdrv, unit, false, -1)) {
234             res = -1;
235             break;
236         }
237     }
238     loc_pop(&loc);
239     return res;
240 }
241
242 static int32_t scsi_invalid_field(SCSIRequest *req, uint8_t *buf)
243 {
244     scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD));
245     scsi_req_complete(req, CHECK_CONDITION);
246     return 0;
247 }
248
249 static const struct SCSIReqOps reqops_invalid_field = {
250     .size         = sizeof(SCSIRequest),
251     .send_command = scsi_invalid_field
252 };
253
254 /* SCSIReqOps implementation for invalid commands.  */
255
256 static int32_t scsi_invalid_command(SCSIRequest *req, uint8_t *buf)
257 {
258     scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE));
259     scsi_req_complete(req, CHECK_CONDITION);
260     return 0;
261 }
262
263 static const struct SCSIReqOps reqops_invalid_opcode = {
264     .size         = sizeof(SCSIRequest),
265     .send_command = scsi_invalid_command
266 };
267
268 /* SCSIReqOps implementation for unit attention conditions.  */
269
270 static int32_t scsi_unit_attention(SCSIRequest *req, uint8_t *buf)
271 {
272     if (req->dev && req->dev->unit_attention.key == UNIT_ATTENTION) {
273         scsi_req_build_sense(req, req->dev->unit_attention);
274     } else if (req->bus->unit_attention.key == UNIT_ATTENTION) {
275         scsi_req_build_sense(req, req->bus->unit_attention);
276     }
277     scsi_req_complete(req, CHECK_CONDITION);
278     return 0;
279 }
280
281 static const struct SCSIReqOps reqops_unit_attention = {
282     .size         = sizeof(SCSIRequest),
283     .send_command = scsi_unit_attention
284 };
285
286 /* SCSIReqOps implementation for REPORT LUNS and for commands sent to
287    an invalid LUN.  */
288
289 typedef struct SCSITargetReq SCSITargetReq;
290
291 struct SCSITargetReq {
292     SCSIRequest req;
293     int len;
294     uint8_t buf[2056];
295 };
296
297 static void store_lun(uint8_t *outbuf, int lun)
298 {
299     if (lun < 256) {
300         outbuf[1] = lun;
301         return;
302     }
303     outbuf[1] = (lun & 255);
304     outbuf[0] = (lun >> 8) | 0x40;
305 }
306
307 static bool scsi_target_emulate_report_luns(SCSITargetReq *r)
308 {
309     DeviceState *qdev;
310     int i, len, n;
311     int channel, id;
312     bool found_lun0;
313
314     if (r->req.cmd.xfer < 16) {
315         return false;
316     }
317     if (r->req.cmd.buf[2] > 2) {
318         return false;
319     }
320     channel = r->req.dev->channel;
321     id = r->req.dev->id;
322     found_lun0 = false;
323     n = 0;
324     QTAILQ_FOREACH(qdev, &r->req.bus->qbus.children, sibling) {
325         SCSIDevice *dev = SCSI_DEVICE(qdev);
326
327         if (dev->channel == channel && dev->id == id) {
328             if (dev->lun == 0) {
329                 found_lun0 = true;
330             }
331             n += 8;
332         }
333     }
334     if (!found_lun0) {
335         n += 8;
336     }
337     len = MIN(n + 8, r->req.cmd.xfer & ~7);
338     if (len > sizeof(r->buf)) {
339         /* TODO: > 256 LUNs? */
340         return false;
341     }
342
343     memset(r->buf, 0, len);
344     stl_be_p(&r->buf, n);
345     i = found_lun0 ? 8 : 16;
346     QTAILQ_FOREACH(qdev, &r->req.bus->qbus.children, sibling) {
347         SCSIDevice *dev = SCSI_DEVICE(qdev);
348
349         if (dev->channel == channel && dev->id == id) {
350             store_lun(&r->buf[i], dev->lun);
351             i += 8;
352         }
353     }
354     assert(i == n + 8);
355     r->len = len;
356     return true;
357 }
358
359 static bool scsi_target_emulate_inquiry(SCSITargetReq *r)
360 {
361     assert(r->req.dev->lun != r->req.lun);
362     if (r->req.cmd.buf[1] & 0x2) {
363         /* Command support data - optional, not implemented */
364         return false;
365     }
366
367     if (r->req.cmd.buf[1] & 0x1) {
368         /* Vital product data */
369         uint8_t page_code = r->req.cmd.buf[2];
370         r->buf[r->len++] = page_code ; /* this page */
371         r->buf[r->len++] = 0x00;
372
373         switch (page_code) {
374         case 0x00: /* Supported page codes, mandatory */
375         {
376             int pages;
377             pages = r->len++;
378             r->buf[r->len++] = 0x00; /* list of supported pages (this page) */
379             r->buf[pages] = r->len - pages - 1; /* number of pages */
380             break;
381         }
382         default:
383             return false;
384         }
385         /* done with EVPD */
386         assert(r->len < sizeof(r->buf));
387         r->len = MIN(r->req.cmd.xfer, r->len);
388         return true;
389     }
390
391     /* Standard INQUIRY data */
392     if (r->req.cmd.buf[2] != 0) {
393         return false;
394     }
395
396     /* PAGE CODE == 0 */
397     r->len = MIN(r->req.cmd.xfer, 36);
398     memset(r->buf, 0, r->len);
399     if (r->req.lun != 0) {
400         r->buf[0] = TYPE_NO_LUN;
401     } else {
402         r->buf[0] = TYPE_NOT_PRESENT | TYPE_INACTIVE;
403         r->buf[2] = 5; /* Version */
404         r->buf[3] = 2 | 0x10; /* HiSup, response data format */
405         r->buf[4] = r->len - 5; /* Additional Length = (Len - 1) - 4 */
406         r->buf[7] = 0x10 | (r->req.bus->info->tcq ? 0x02 : 0); /* Sync, TCQ.  */
407         memcpy(&r->buf[8], "QEMU    ", 8);
408         memcpy(&r->buf[16], "QEMU TARGET     ", 16);
409         strncpy((char *) &r->buf[32], QEMU_VERSION, 4);
410     }
411     return true;
412 }
413
414 static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
415 {
416     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
417
418     switch (buf[0]) {
419     case REPORT_LUNS:
420         if (!scsi_target_emulate_report_luns(r)) {
421             goto illegal_request;
422         }
423         break;
424     case INQUIRY:
425         if (!scsi_target_emulate_inquiry(r)) {
426             goto illegal_request;
427         }
428         break;
429     case REQUEST_SENSE:
430         r->len = scsi_device_get_sense(r->req.dev, r->buf,
431                                        MIN(req->cmd.xfer, sizeof r->buf),
432                                        (req->cmd.buf[1] & 1) == 0);
433         if (r->req.dev->sense_is_ua) {
434             scsi_device_unit_attention_reported(req->dev);
435             r->req.dev->sense_len = 0;
436             r->req.dev->sense_is_ua = false;
437         }
438         break;
439     default:
440         scsi_req_build_sense(req, SENSE_CODE(LUN_NOT_SUPPORTED));
441         scsi_req_complete(req, CHECK_CONDITION);
442         return 0;
443     illegal_request:
444         scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD));
445         scsi_req_complete(req, CHECK_CONDITION);
446         return 0;
447     }
448
449     if (!r->len) {
450         scsi_req_complete(req, GOOD);
451     }
452     return r->len;
453 }
454
455 static void scsi_target_read_data(SCSIRequest *req)
456 {
457     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
458     uint32_t n;
459
460     n = r->len;
461     if (n > 0) {
462         r->len = 0;
463         scsi_req_data(&r->req, n);
464     } else {
465         scsi_req_complete(&r->req, GOOD);
466     }
467 }
468
469 static uint8_t *scsi_target_get_buf(SCSIRequest *req)
470 {
471     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
472
473     return r->buf;
474 }
475
476 static const struct SCSIReqOps reqops_target_command = {
477     .size         = sizeof(SCSITargetReq),
478     .send_command = scsi_target_send_command,
479     .read_data    = scsi_target_read_data,
480     .get_buf      = scsi_target_get_buf,
481 };
482
483
484 SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d,
485                             uint32_t tag, uint32_t lun, void *hba_private)
486 {
487     SCSIRequest *req;
488
489     req = g_malloc0(reqops->size);
490     req->refcount = 1;
491     req->bus = scsi_bus_from_device(d);
492     req->dev = d;
493     req->tag = tag;
494     req->lun = lun;
495     req->hba_private = hba_private;
496     req->status = -1;
497     req->sense_len = 0;
498     req->ops = reqops;
499     trace_scsi_req_alloc(req->dev->id, req->lun, req->tag);
500     return req;
501 }
502
503 SCSIRequest *scsi_req_new(SCSIDevice *d, uint32_t tag, uint32_t lun,
504                           uint8_t *buf, void *hba_private)
505 {
506     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, d->qdev.parent_bus);
507     SCSIRequest *req;
508     SCSICommand cmd;
509
510     if (scsi_req_parse(&cmd, d, buf) != 0) {
511         trace_scsi_req_parse_bad(d->id, lun, tag, buf[0]);
512         req = scsi_req_alloc(&reqops_invalid_opcode, d, tag, lun, hba_private);
513     } else {
514         trace_scsi_req_parsed(d->id, lun, tag, buf[0],
515                               cmd.mode, cmd.xfer);
516         if (cmd.lba != -1) {
517             trace_scsi_req_parsed_lba(d->id, lun, tag, buf[0],
518                                       cmd.lba);
519         }
520
521         if (cmd.xfer > INT32_MAX) {
522             req = scsi_req_alloc(&reqops_invalid_field, d, tag, lun, hba_private);
523         } else if ((d->unit_attention.key == UNIT_ATTENTION ||
524                    bus->unit_attention.key == UNIT_ATTENTION) &&
525                   (buf[0] != INQUIRY &&
526                    buf[0] != REPORT_LUNS &&
527                    buf[0] != GET_CONFIGURATION &&
528                    buf[0] != GET_EVENT_STATUS_NOTIFICATION &&
529
530                    /*
531                     * If we already have a pending unit attention condition,
532                     * report this one before triggering another one.
533                     */
534                    !(buf[0] == REQUEST_SENSE && d->sense_is_ua))) {
535             req = scsi_req_alloc(&reqops_unit_attention, d, tag, lun,
536                                  hba_private);
537         } else if (lun != d->lun ||
538                    buf[0] == REPORT_LUNS ||
539                    (buf[0] == REQUEST_SENSE && d->sense_len)) {
540             req = scsi_req_alloc(&reqops_target_command, d, tag, lun,
541                                  hba_private);
542         } else {
543             req = scsi_device_alloc_req(d, tag, lun, buf, hba_private);
544         }
545     }
546
547     req->cmd = cmd;
548     req->resid = req->cmd.xfer;
549
550     switch (buf[0]) {
551     case INQUIRY:
552         trace_scsi_inquiry(d->id, lun, tag, cmd.buf[1], cmd.buf[2]);
553         break;
554     case TEST_UNIT_READY:
555         trace_scsi_test_unit_ready(d->id, lun, tag);
556         break;
557     case REPORT_LUNS:
558         trace_scsi_report_luns(d->id, lun, tag);
559         break;
560     case REQUEST_SENSE:
561         trace_scsi_request_sense(d->id, lun, tag);
562         break;
563     default:
564         break;
565     }
566
567     return req;
568 }
569
570 uint8_t *scsi_req_get_buf(SCSIRequest *req)
571 {
572     return req->ops->get_buf(req);
573 }
574
575 static void scsi_clear_unit_attention(SCSIRequest *req)
576 {
577     SCSISense *ua;
578     if (req->dev->unit_attention.key != UNIT_ATTENTION &&
579         req->bus->unit_attention.key != UNIT_ATTENTION) {
580         return;
581     }
582
583     /*
584      * If an INQUIRY command enters the enabled command state,
585      * the device server shall [not] clear any unit attention condition;
586      * See also MMC-6, paragraphs 6.5 and 6.6.2.
587      */
588     if (req->cmd.buf[0] == INQUIRY ||
589         req->cmd.buf[0] == GET_CONFIGURATION ||
590         req->cmd.buf[0] == GET_EVENT_STATUS_NOTIFICATION) {
591         return;
592     }
593
594     if (req->dev->unit_attention.key == UNIT_ATTENTION) {
595         ua = &req->dev->unit_attention;
596     } else {
597         ua = &req->bus->unit_attention;
598     }
599
600     /*
601      * If a REPORT LUNS command enters the enabled command state, [...]
602      * the device server shall clear any pending unit attention condition
603      * with an additional sense code of REPORTED LUNS DATA HAS CHANGED.
604      */
605     if (req->cmd.buf[0] == REPORT_LUNS &&
606         !(ua->asc == SENSE_CODE(REPORTED_LUNS_CHANGED).asc &&
607           ua->ascq == SENSE_CODE(REPORTED_LUNS_CHANGED).ascq)) {
608         return;
609     }
610
611     *ua = SENSE_CODE(NO_SENSE);
612 }
613
614 int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len)
615 {
616     int ret;
617
618     assert(len >= 14);
619     if (!req->sense_len) {
620         return 0;
621     }
622
623     ret = scsi_build_sense(req->sense, req->sense_len, buf, len, true);
624
625     /*
626      * FIXME: clearing unit attention conditions upon autosense should be done
627      * only if the UA_INTLCK_CTRL field in the Control mode page is set to 00b
628      * (SAM-5, 5.14).
629      *
630      * We assume UA_INTLCK_CTRL to be 00b for HBAs that support autosense, and
631      * 10b for HBAs that do not support it (do not call scsi_req_get_sense).
632      * Here we handle unit attention clearing for UA_INTLCK_CTRL == 00b.
633      */
634     if (req->dev->sense_is_ua) {
635         scsi_device_unit_attention_reported(req->dev);
636         req->dev->sense_len = 0;
637         req->dev->sense_is_ua = false;
638     }
639     return ret;
640 }
641
642 int scsi_device_get_sense(SCSIDevice *dev, uint8_t *buf, int len, bool fixed)
643 {
644     return scsi_build_sense(dev->sense, dev->sense_len, buf, len, fixed);
645 }
646
647 void scsi_req_build_sense(SCSIRequest *req, SCSISense sense)
648 {
649     trace_scsi_req_build_sense(req->dev->id, req->lun, req->tag,
650                                sense.key, sense.asc, sense.ascq);
651     memset(req->sense, 0, 18);
652     req->sense[0] = 0x70;
653     req->sense[2] = sense.key;
654     req->sense[7] = 10;
655     req->sense[12] = sense.asc;
656     req->sense[13] = sense.ascq;
657     req->sense_len = 18;
658 }
659
660 static void scsi_req_enqueue_internal(SCSIRequest *req)
661 {
662     assert(!req->enqueued);
663     scsi_req_ref(req);
664     if (req->bus->info->get_sg_list) {
665         req->sg = req->bus->info->get_sg_list(req);
666     } else {
667         req->sg = NULL;
668     }
669     req->enqueued = true;
670     QTAILQ_INSERT_TAIL(&req->dev->requests, req, next);
671 }
672
673 int32_t scsi_req_enqueue(SCSIRequest *req)
674 {
675     int32_t rc;
676
677     assert(!req->retry);
678     scsi_req_enqueue_internal(req);
679     scsi_req_ref(req);
680     rc = req->ops->send_command(req, req->cmd.buf);
681     scsi_req_unref(req);
682     return rc;
683 }
684
685 static void scsi_req_dequeue(SCSIRequest *req)
686 {
687     trace_scsi_req_dequeue(req->dev->id, req->lun, req->tag);
688     req->retry = false;
689     if (req->enqueued) {
690         QTAILQ_REMOVE(&req->dev->requests, req, next);
691         req->enqueued = false;
692         scsi_req_unref(req);
693     }
694 }
695
696 static int scsi_get_performance_length(int num_desc, int type, int data_type)
697 {
698     /* MMC-6, paragraph 6.7.  */
699     switch (type) {
700     case 0:
701         if ((data_type & 3) == 0) {
702             /* Each descriptor is as in Table 295 - Nominal performance.  */
703             return 16 * num_desc + 8;
704         } else {
705             /* Each descriptor is as in Table 296 - Exceptions.  */
706             return 6 * num_desc + 8;
707         }
708     case 1:
709     case 4:
710     case 5:
711         return 8 * num_desc + 8;
712     case 2:
713         return 2048 * num_desc + 8;
714     case 3:
715         return 16 * num_desc + 8;
716     default:
717         return 8;
718     }
719 }
720
721 static int scsi_req_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
722 {
723     switch (buf[0] >> 5) {
724     case 0:
725         cmd->xfer = buf[4];
726         cmd->len = 6;
727         break;
728     case 1:
729     case 2:
730         cmd->xfer = lduw_be_p(&buf[7]);
731         cmd->len = 10;
732         break;
733     case 4:
734         cmd->xfer = ldl_be_p(&buf[10]) & 0xffffffffULL;
735         cmd->len = 16;
736         break;
737     case 5:
738         cmd->xfer = ldl_be_p(&buf[6]) & 0xffffffffULL;
739         cmd->len = 12;
740         break;
741     default:
742         return -1;
743     }
744
745     switch (buf[0]) {
746     case TEST_UNIT_READY:
747     case REWIND:
748     case START_STOP:
749     case SET_CAPACITY:
750     case WRITE_FILEMARKS:
751     case WRITE_FILEMARKS_16:
752     case SPACE:
753     case RESERVE:
754     case RELEASE:
755     case ERASE:
756     case ALLOW_MEDIUM_REMOVAL:
757     case VERIFY_10:
758     case SEEK_10:
759     case SYNCHRONIZE_CACHE:
760     case SYNCHRONIZE_CACHE_16:
761     case LOCATE_16:
762     case LOCK_UNLOCK_CACHE:
763     case LOAD_UNLOAD:
764     case SET_CD_SPEED:
765     case SET_LIMITS:
766     case WRITE_LONG_10:
767     case MOVE_MEDIUM:
768     case UPDATE_BLOCK:
769     case RESERVE_TRACK:
770     case SET_READ_AHEAD:
771     case PRE_FETCH:
772     case PRE_FETCH_16:
773     case ALLOW_OVERWRITE:
774         cmd->xfer = 0;
775         break;
776     case MODE_SENSE:
777         break;
778     case WRITE_SAME_10:
779     case WRITE_SAME_16:
780         cmd->xfer = dev->blocksize;
781         break;
782     case READ_CAPACITY_10:
783         cmd->xfer = 8;
784         break;
785     case READ_BLOCK_LIMITS:
786         cmd->xfer = 6;
787         break;
788     case SEND_VOLUME_TAG:
789         /* GPCMD_SET_STREAMING from multimedia commands.  */
790         if (dev->type == TYPE_ROM) {
791             cmd->xfer = buf[10] | (buf[9] << 8);
792         } else {
793             cmd->xfer = buf[9] | (buf[8] << 8);
794         }
795         break;
796     case WRITE_6:
797         /* length 0 means 256 blocks */
798         if (cmd->xfer == 0) {
799             cmd->xfer = 256;
800         }
801     case WRITE_10:
802     case WRITE_VERIFY_10:
803     case WRITE_12:
804     case WRITE_VERIFY_12:
805     case WRITE_16:
806     case WRITE_VERIFY_16:
807         cmd->xfer *= dev->blocksize;
808         break;
809     case READ_6:
810     case READ_REVERSE:
811         /* length 0 means 256 blocks */
812         if (cmd->xfer == 0) {
813             cmd->xfer = 256;
814         }
815     case READ_10:
816     case RECOVER_BUFFERED_DATA:
817     case READ_12:
818     case READ_16:
819         cmd->xfer *= dev->blocksize;
820         break;
821     case FORMAT_UNIT:
822         /* MMC mandates the parameter list to be 12-bytes long.  Parameters
823          * for block devices are restricted to the header right now.  */
824         if (dev->type == TYPE_ROM && (buf[1] & 16)) {
825             cmd->xfer = 12;
826         } else {
827             cmd->xfer = (buf[1] & 16) == 0 ? 0 : (buf[1] & 32 ? 8 : 4);
828         }
829         break;
830     case INQUIRY:
831     case RECEIVE_DIAGNOSTIC:
832     case SEND_DIAGNOSTIC:
833         cmd->xfer = buf[4] | (buf[3] << 8);
834         break;
835     case READ_CD:
836     case READ_BUFFER:
837     case WRITE_BUFFER:
838     case SEND_CUE_SHEET:
839         cmd->xfer = buf[8] | (buf[7] << 8) | (buf[6] << 16);
840         break;
841     case PERSISTENT_RESERVE_OUT:
842         cmd->xfer = ldl_be_p(&buf[5]) & 0xffffffffULL;
843         break;
844     case ERASE_12:
845         if (dev->type == TYPE_ROM) {
846             /* MMC command GET PERFORMANCE.  */
847             cmd->xfer = scsi_get_performance_length(buf[9] | (buf[8] << 8),
848                                                     buf[10], buf[1] & 0x1f);
849         }
850         break;
851     case MECHANISM_STATUS:
852     case READ_DVD_STRUCTURE:
853     case SEND_DVD_STRUCTURE:
854     case MAINTENANCE_OUT:
855     case MAINTENANCE_IN:
856         if (dev->type == TYPE_ROM) {
857             /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */
858             cmd->xfer = buf[9] | (buf[8] << 8);
859         }
860         break;
861     }
862     return 0;
863 }
864
865 static int scsi_req_stream_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
866 {
867     switch (buf[0]) {
868     /* stream commands */
869     case ERASE_12:
870     case ERASE_16:
871         cmd->xfer = 0;
872         break;
873     case READ_6:
874     case READ_REVERSE:
875     case RECOVER_BUFFERED_DATA:
876     case WRITE_6:
877         cmd->len = 6;
878         cmd->xfer = buf[4] | (buf[3] << 8) | (buf[2] << 16);
879         if (buf[1] & 0x01) { /* fixed */
880             cmd->xfer *= dev->blocksize;
881         }
882         break;
883     case READ_16:
884     case READ_REVERSE_16:
885     case VERIFY_16:
886     case WRITE_16:
887         cmd->len = 16;
888         cmd->xfer = buf[14] | (buf[13] << 8) | (buf[12] << 16);
889         if (buf[1] & 0x01) { /* fixed */
890             cmd->xfer *= dev->blocksize;
891         }
892         break;
893     case REWIND:
894     case START_STOP:
895         cmd->len = 6;
896         cmd->xfer = 0;
897         break;
898     case SPACE_16:
899         cmd->xfer = buf[13] | (buf[12] << 8);
900         break;
901     case READ_POSITION:
902         cmd->xfer = buf[8] | (buf[7] << 8);
903         break;
904     case FORMAT_UNIT:
905         cmd->xfer = buf[4] | (buf[3] << 8);
906         break;
907     /* generic commands */
908     default:
909         return scsi_req_length(cmd, dev, buf);
910     }
911     return 0;
912 }
913
914 static void scsi_cmd_xfer_mode(SCSICommand *cmd)
915 {
916     if (!cmd->xfer) {
917         cmd->mode = SCSI_XFER_NONE;
918         return;
919     }
920     switch (cmd->buf[0]) {
921     case WRITE_6:
922     case WRITE_10:
923     case WRITE_VERIFY_10:
924     case WRITE_12:
925     case WRITE_VERIFY_12:
926     case WRITE_16:
927     case WRITE_VERIFY_16:
928     case COPY:
929     case COPY_VERIFY:
930     case COMPARE:
931     case CHANGE_DEFINITION:
932     case LOG_SELECT:
933     case MODE_SELECT:
934     case MODE_SELECT_10:
935     case SEND_DIAGNOSTIC:
936     case WRITE_BUFFER:
937     case FORMAT_UNIT:
938     case REASSIGN_BLOCKS:
939     case SEARCH_EQUAL:
940     case SEARCH_HIGH:
941     case SEARCH_LOW:
942     case UPDATE_BLOCK:
943     case WRITE_LONG_10:
944     case WRITE_SAME_10:
945     case WRITE_SAME_16:
946     case UNMAP:
947     case SEARCH_HIGH_12:
948     case SEARCH_EQUAL_12:
949     case SEARCH_LOW_12:
950     case MEDIUM_SCAN:
951     case SEND_VOLUME_TAG:
952     case SEND_CUE_SHEET:
953     case SEND_DVD_STRUCTURE:
954     case PERSISTENT_RESERVE_OUT:
955     case MAINTENANCE_OUT:
956     case ATA_PASSTHROUGH:
957         cmd->mode = SCSI_XFER_TO_DEV;
958         break;
959     default:
960         cmd->mode = SCSI_XFER_FROM_DEV;
961         break;
962     }
963 }
964
965 static uint64_t scsi_cmd_lba(SCSICommand *cmd)
966 {
967     uint8_t *buf = cmd->buf;
968     uint64_t lba;
969
970     switch (buf[0] >> 5) {
971     case 0:
972         lba = ldl_be_p(&buf[0]) & 0x1fffff;
973         break;
974     case 1:
975     case 2:
976     case 5:
977         lba = ldl_be_p(&buf[2]) & 0xffffffffULL;
978         break;
979     case 4:
980         lba = ldq_be_p(&buf[2]);
981         break;
982     default:
983         lba = -1;
984
985     }
986     return lba;
987 }
988
989 int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
990 {
991     int rc;
992
993     if (dev->type == TYPE_TAPE) {
994         rc = scsi_req_stream_length(cmd, dev, buf);
995     } else {
996         rc = scsi_req_length(cmd, dev, buf);
997     }
998     if (rc != 0)
999         return rc;
1000
1001     memcpy(cmd->buf, buf, cmd->len);
1002     scsi_cmd_xfer_mode(cmd);
1003     cmd->lba = scsi_cmd_lba(cmd);
1004     return 0;
1005 }
1006
1007 /*
1008  * Predefined sense codes
1009  */
1010
1011 /* No sense data available */
1012 const struct SCSISense sense_code_NO_SENSE = {
1013     .key = NO_SENSE , .asc = 0x00 , .ascq = 0x00
1014 };
1015
1016 /* LUN not ready, Manual intervention required */
1017 const struct SCSISense sense_code_LUN_NOT_READY = {
1018     .key = NOT_READY, .asc = 0x04, .ascq = 0x03
1019 };
1020
1021 /* LUN not ready, Medium not present */
1022 const struct SCSISense sense_code_NO_MEDIUM = {
1023     .key = NOT_READY, .asc = 0x3a, .ascq = 0x00
1024 };
1025
1026 /* LUN not ready, medium removal prevented */
1027 const struct SCSISense sense_code_NOT_READY_REMOVAL_PREVENTED = {
1028     .key = NOT_READY, .asc = 0x53, .ascq = 0x00
1029 };
1030
1031 /* Hardware error, internal target failure */
1032 const struct SCSISense sense_code_TARGET_FAILURE = {
1033     .key = HARDWARE_ERROR, .asc = 0x44, .ascq = 0x00
1034 };
1035
1036 /* Illegal request, invalid command operation code */
1037 const struct SCSISense sense_code_INVALID_OPCODE = {
1038     .key = ILLEGAL_REQUEST, .asc = 0x20, .ascq = 0x00
1039 };
1040
1041 /* Illegal request, LBA out of range */
1042 const struct SCSISense sense_code_LBA_OUT_OF_RANGE = {
1043     .key = ILLEGAL_REQUEST, .asc = 0x21, .ascq = 0x00
1044 };
1045
1046 /* Illegal request, Invalid field in CDB */
1047 const struct SCSISense sense_code_INVALID_FIELD = {
1048     .key = ILLEGAL_REQUEST, .asc = 0x24, .ascq = 0x00
1049 };
1050
1051 /* Illegal request, LUN not supported */
1052 const struct SCSISense sense_code_LUN_NOT_SUPPORTED = {
1053     .key = ILLEGAL_REQUEST, .asc = 0x25, .ascq = 0x00
1054 };
1055
1056 /* Illegal request, Saving parameters not supported */
1057 const struct SCSISense sense_code_SAVING_PARAMS_NOT_SUPPORTED = {
1058     .key = ILLEGAL_REQUEST, .asc = 0x39, .ascq = 0x00
1059 };
1060
1061 /* Illegal request, Incompatible medium installed */
1062 const struct SCSISense sense_code_INCOMPATIBLE_FORMAT = {
1063     .key = ILLEGAL_REQUEST, .asc = 0x30, .ascq = 0x00
1064 };
1065
1066 /* Illegal request, medium removal prevented */
1067 const struct SCSISense sense_code_ILLEGAL_REQ_REMOVAL_PREVENTED = {
1068     .key = ILLEGAL_REQUEST, .asc = 0x53, .ascq = 0x00
1069 };
1070
1071 /* Command aborted, I/O process terminated */
1072 const struct SCSISense sense_code_IO_ERROR = {
1073     .key = ABORTED_COMMAND, .asc = 0x00, .ascq = 0x06
1074 };
1075
1076 /* Command aborted, I_T Nexus loss occurred */
1077 const struct SCSISense sense_code_I_T_NEXUS_LOSS = {
1078     .key = ABORTED_COMMAND, .asc = 0x29, .ascq = 0x07
1079 };
1080
1081 /* Command aborted, Logical Unit failure */
1082 const struct SCSISense sense_code_LUN_FAILURE = {
1083     .key = ABORTED_COMMAND, .asc = 0x3e, .ascq = 0x01
1084 };
1085
1086 /* Unit attention, Power on, reset or bus device reset occurred */
1087 const struct SCSISense sense_code_RESET = {
1088     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x00
1089 };
1090
1091 /* Unit attention, No medium */
1092 const struct SCSISense sense_code_UNIT_ATTENTION_NO_MEDIUM = {
1093     .key = UNIT_ATTENTION, .asc = 0x3a, .ascq = 0x00
1094 };
1095
1096 /* Unit attention, Medium may have changed */
1097 const struct SCSISense sense_code_MEDIUM_CHANGED = {
1098     .key = UNIT_ATTENTION, .asc = 0x28, .ascq = 0x00
1099 };
1100
1101 /* Unit attention, Reported LUNs data has changed */
1102 const struct SCSISense sense_code_REPORTED_LUNS_CHANGED = {
1103     .key = UNIT_ATTENTION, .asc = 0x3f, .ascq = 0x0e
1104 };
1105
1106 /* Unit attention, Device internal reset */
1107 const struct SCSISense sense_code_DEVICE_INTERNAL_RESET = {
1108     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x04
1109 };
1110
1111 /*
1112  * scsi_build_sense
1113  *
1114  * Convert between fixed and descriptor sense buffers
1115  */
1116 int scsi_build_sense(uint8_t *in_buf, int in_len,
1117                      uint8_t *buf, int len, bool fixed)
1118 {
1119     bool fixed_in;
1120     SCSISense sense;
1121     if (!fixed && len < 8) {
1122         return 0;
1123     }
1124
1125     if (in_len == 0) {
1126         sense.key = NO_SENSE;
1127         sense.asc = 0;
1128         sense.ascq = 0;
1129     } else {
1130         fixed_in = (in_buf[0] & 2) == 0;
1131
1132         if (fixed == fixed_in) {
1133             memcpy(buf, in_buf, MIN(len, in_len));
1134             return MIN(len, in_len);
1135         }
1136
1137         if (fixed_in) {
1138             sense.key = in_buf[2];
1139             sense.asc = in_buf[12];
1140             sense.ascq = in_buf[13];
1141         } else {
1142             sense.key = in_buf[1];
1143             sense.asc = in_buf[2];
1144             sense.ascq = in_buf[3];
1145         }
1146     }
1147
1148     memset(buf, 0, len);
1149     if (fixed) {
1150         /* Return fixed format sense buffer */
1151         buf[0] = 0x70;
1152         buf[2] = sense.key;
1153         buf[7] = 10;
1154         buf[12] = sense.asc;
1155         buf[13] = sense.ascq;
1156         return MIN(len, 18);
1157     } else {
1158         /* Return descriptor format sense buffer */
1159         buf[0] = 0x72;
1160         buf[1] = sense.key;
1161         buf[2] = sense.asc;
1162         buf[3] = sense.ascq;
1163         return 8;
1164     }
1165 }
1166
1167 static const char *scsi_command_name(uint8_t cmd)
1168 {
1169     static const char *names[] = {
1170         [ TEST_UNIT_READY          ] = "TEST_UNIT_READY",
1171         [ REWIND                   ] = "REWIND",
1172         [ REQUEST_SENSE            ] = "REQUEST_SENSE",
1173         [ FORMAT_UNIT              ] = "FORMAT_UNIT",
1174         [ READ_BLOCK_LIMITS        ] = "READ_BLOCK_LIMITS",
1175         [ REASSIGN_BLOCKS          ] = "REASSIGN_BLOCKS",
1176         [ READ_6                   ] = "READ_6",
1177         [ WRITE_6                  ] = "WRITE_6",
1178         [ SET_CAPACITY             ] = "SET_CAPACITY",
1179         [ READ_REVERSE             ] = "READ_REVERSE",
1180         [ WRITE_FILEMARKS          ] = "WRITE_FILEMARKS",
1181         [ SPACE                    ] = "SPACE",
1182         [ INQUIRY                  ] = "INQUIRY",
1183         [ RECOVER_BUFFERED_DATA    ] = "RECOVER_BUFFERED_DATA",
1184         [ MAINTENANCE_IN           ] = "MAINTENANCE_IN",
1185         [ MAINTENANCE_OUT          ] = "MAINTENANCE_OUT",
1186         [ MODE_SELECT              ] = "MODE_SELECT",
1187         [ RESERVE                  ] = "RESERVE",
1188         [ RELEASE                  ] = "RELEASE",
1189         [ COPY                     ] = "COPY",
1190         [ ERASE                    ] = "ERASE",
1191         [ MODE_SENSE               ] = "MODE_SENSE",
1192         [ START_STOP               ] = "START_STOP",
1193         [ RECEIVE_DIAGNOSTIC       ] = "RECEIVE_DIAGNOSTIC",
1194         [ SEND_DIAGNOSTIC          ] = "SEND_DIAGNOSTIC",
1195         [ ALLOW_MEDIUM_REMOVAL     ] = "ALLOW_MEDIUM_REMOVAL",
1196         [ READ_CAPACITY_10         ] = "READ_CAPACITY_10",
1197         [ READ_10                  ] = "READ_10",
1198         [ WRITE_10                 ] = "WRITE_10",
1199         [ SEEK_10                  ] = "SEEK_10",
1200         [ WRITE_VERIFY_10          ] = "WRITE_VERIFY_10",
1201         [ VERIFY_10                ] = "VERIFY_10",
1202         [ SEARCH_HIGH              ] = "SEARCH_HIGH",
1203         [ SEARCH_EQUAL             ] = "SEARCH_EQUAL",
1204         [ SEARCH_LOW               ] = "SEARCH_LOW",
1205         [ SET_LIMITS               ] = "SET_LIMITS",
1206         [ PRE_FETCH                ] = "PRE_FETCH/READ_POSITION",
1207         /* READ_POSITION and PRE_FETCH use the same operation code */
1208         [ SYNCHRONIZE_CACHE        ] = "SYNCHRONIZE_CACHE",
1209         [ LOCK_UNLOCK_CACHE        ] = "LOCK_UNLOCK_CACHE",
1210         [ READ_DEFECT_DATA         ] = "READ_DEFECT_DATA",
1211         [ MEDIUM_SCAN              ] = "MEDIUM_SCAN",
1212         [ COMPARE                  ] = "COMPARE",
1213         [ COPY_VERIFY              ] = "COPY_VERIFY",
1214         [ WRITE_BUFFER             ] = "WRITE_BUFFER",
1215         [ READ_BUFFER              ] = "READ_BUFFER",
1216         [ UPDATE_BLOCK             ] = "UPDATE_BLOCK",
1217         [ READ_LONG_10             ] = "READ_LONG_10",
1218         [ WRITE_LONG_10            ] = "WRITE_LONG_10",
1219         [ CHANGE_DEFINITION        ] = "CHANGE_DEFINITION",
1220         [ WRITE_SAME_10            ] = "WRITE_SAME_10",
1221         [ UNMAP                    ] = "UNMAP",
1222         [ READ_TOC                 ] = "READ_TOC",
1223         [ REPORT_DENSITY_SUPPORT   ] = "REPORT_DENSITY_SUPPORT",
1224         [ SANITIZE                 ] = "SANITIZE",
1225         [ GET_CONFIGURATION        ] = "GET_CONFIGURATION",
1226         [ LOG_SELECT               ] = "LOG_SELECT",
1227         [ LOG_SENSE                ] = "LOG_SENSE",
1228         [ MODE_SELECT_10           ] = "MODE_SELECT_10",
1229         [ RESERVE_10               ] = "RESERVE_10",
1230         [ RELEASE_10               ] = "RELEASE_10",
1231         [ MODE_SENSE_10            ] = "MODE_SENSE_10",
1232         [ PERSISTENT_RESERVE_IN    ] = "PERSISTENT_RESERVE_IN",
1233         [ PERSISTENT_RESERVE_OUT   ] = "PERSISTENT_RESERVE_OUT",
1234         [ WRITE_FILEMARKS_16       ] = "WRITE_FILEMARKS_16",
1235         [ EXTENDED_COPY            ] = "EXTENDED_COPY",
1236         [ ATA_PASSTHROUGH          ] = "ATA_PASSTHROUGH",
1237         [ ACCESS_CONTROL_IN        ] = "ACCESS_CONTROL_IN",
1238         [ ACCESS_CONTROL_OUT       ] = "ACCESS_CONTROL_OUT",
1239         [ READ_16                  ] = "READ_16",
1240         [ COMPARE_AND_WRITE        ] = "COMPARE_AND_WRITE",
1241         [ WRITE_16                 ] = "WRITE_16",
1242         [ WRITE_VERIFY_16          ] = "WRITE_VERIFY_16",
1243         [ VERIFY_16                ] = "VERIFY_16",
1244         [ PRE_FETCH_16             ] = "PRE_FETCH_16",
1245         [ SYNCHRONIZE_CACHE_16     ] = "SPACE_16/SYNCHRONIZE_CACHE_16",
1246         /* SPACE_16 and SYNCHRONIZE_CACHE_16 use the same operation code */
1247         [ LOCATE_16                ] = "LOCATE_16",
1248         [ WRITE_SAME_16            ] = "ERASE_16/WRITE_SAME_16",
1249         /* ERASE_16 and WRITE_SAME_16 use the same operation code */
1250         [ SERVICE_ACTION_IN_16     ] = "SERVICE_ACTION_IN_16",
1251         [ WRITE_LONG_16            ] = "WRITE_LONG_16",
1252         [ REPORT_LUNS              ] = "REPORT_LUNS",
1253         [ BLANK                    ] = "BLANK",
1254         [ MOVE_MEDIUM              ] = "MOVE_MEDIUM",
1255         [ LOAD_UNLOAD              ] = "LOAD_UNLOAD",
1256         [ READ_12                  ] = "READ_12",
1257         [ WRITE_12                 ] = "WRITE_12",
1258         [ ERASE_12                 ] = "ERASE_12/GET_PERFORMANCE",
1259         /* ERASE_12 and GET_PERFORMANCE use the same operation code */
1260         [ SERVICE_ACTION_IN_12     ] = "SERVICE_ACTION_IN_12",
1261         [ WRITE_VERIFY_12          ] = "WRITE_VERIFY_12",
1262         [ VERIFY_12                ] = "VERIFY_12",
1263         [ SEARCH_HIGH_12           ] = "SEARCH_HIGH_12",
1264         [ SEARCH_EQUAL_12          ] = "SEARCH_EQUAL_12",
1265         [ SEARCH_LOW_12            ] = "SEARCH_LOW_12",
1266         [ READ_ELEMENT_STATUS      ] = "READ_ELEMENT_STATUS",
1267         [ SEND_VOLUME_TAG          ] = "SEND_VOLUME_TAG/SET_STREAMING",
1268         /* SEND_VOLUME_TAG and SET_STREAMING use the same operation code */
1269         [ READ_CD                  ] = "READ_CD",
1270         [ READ_DEFECT_DATA_12      ] = "READ_DEFECT_DATA_12",
1271         [ READ_DVD_STRUCTURE       ] = "READ_DVD_STRUCTURE",
1272         [ RESERVE_TRACK            ] = "RESERVE_TRACK",
1273         [ SEND_CUE_SHEET           ] = "SEND_CUE_SHEET",
1274         [ SEND_DVD_STRUCTURE       ] = "SEND_DVD_STRUCTURE",
1275         [ SET_CD_SPEED             ] = "SET_CD_SPEED",
1276         [ SET_READ_AHEAD           ] = "SET_READ_AHEAD",
1277         [ ALLOW_OVERWRITE          ] = "ALLOW_OVERWRITE",
1278         [ MECHANISM_STATUS         ] = "MECHANISM_STATUS",
1279     };
1280
1281     if (cmd >= ARRAY_SIZE(names) || names[cmd] == NULL)
1282         return "*UNKNOWN*";
1283     return names[cmd];
1284 }
1285
1286 SCSIRequest *scsi_req_ref(SCSIRequest *req)
1287 {
1288     req->refcount++;
1289     return req;
1290 }
1291
1292 void scsi_req_unref(SCSIRequest *req)
1293 {
1294     assert(req->refcount > 0);
1295     if (--req->refcount == 0) {
1296         if (req->ops->free_req) {
1297             req->ops->free_req(req);
1298         }
1299         g_free(req);
1300     }
1301 }
1302
1303 /* Tell the device that we finished processing this chunk of I/O.  It
1304    will start the next chunk or complete the command.  */
1305 void scsi_req_continue(SCSIRequest *req)
1306 {
1307     trace_scsi_req_continue(req->dev->id, req->lun, req->tag);
1308     if (req->cmd.mode == SCSI_XFER_TO_DEV) {
1309         req->ops->write_data(req);
1310     } else {
1311         req->ops->read_data(req);
1312     }
1313 }
1314
1315 /* Called by the devices when data is ready for the HBA.  The HBA should
1316    start a DMA operation to read or fill the device's data buffer.
1317    Once it completes, calling scsi_req_continue will restart I/O.  */
1318 void scsi_req_data(SCSIRequest *req, int len)
1319 {
1320     uint8_t *buf;
1321     if (req->io_canceled) {
1322         trace_scsi_req_data_canceled(req->dev->id, req->lun, req->tag, len);
1323         return;
1324     }
1325     trace_scsi_req_data(req->dev->id, req->lun, req->tag, len);
1326     assert(req->cmd.mode != SCSI_XFER_NONE);
1327     if (!req->sg) {
1328         req->resid -= len;
1329         req->bus->info->transfer_data(req, len);
1330         return;
1331     }
1332
1333     /* If the device calls scsi_req_data and the HBA specified a
1334      * scatter/gather list, the transfer has to happen in a single
1335      * step.  */
1336     assert(!req->dma_started);
1337     req->dma_started = true;
1338
1339     buf = scsi_req_get_buf(req);
1340     if (req->cmd.mode == SCSI_XFER_FROM_DEV) {
1341         req->resid = dma_buf_read(buf, len, req->sg);
1342     } else {
1343         req->resid = dma_buf_write(buf, len, req->sg);
1344     }
1345     scsi_req_continue(req);
1346 }
1347
1348 void scsi_req_print(SCSIRequest *req)
1349 {
1350     FILE *fp = stderr;
1351     int i;
1352
1353     fprintf(fp, "[%s id=%d] %s",
1354             req->dev->qdev.parent_bus->name,
1355             req->dev->id,
1356             scsi_command_name(req->cmd.buf[0]));
1357     for (i = 1; i < req->cmd.len; i++) {
1358         fprintf(fp, " 0x%02x", req->cmd.buf[i]);
1359     }
1360     switch (req->cmd.mode) {
1361     case SCSI_XFER_NONE:
1362         fprintf(fp, " - none\n");
1363         break;
1364     case SCSI_XFER_FROM_DEV:
1365         fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer);
1366         break;
1367     case SCSI_XFER_TO_DEV:
1368         fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer);
1369         break;
1370     default:
1371         fprintf(fp, " - Oops\n");
1372         break;
1373     }
1374 }
1375
1376 void scsi_req_complete(SCSIRequest *req, int status)
1377 {
1378     assert(req->status == -1);
1379     req->status = status;
1380
1381     assert(req->sense_len < sizeof(req->sense));
1382     if (status == GOOD) {
1383         req->sense_len = 0;
1384     }
1385
1386     if (req->sense_len) {
1387         memcpy(req->dev->sense, req->sense, req->sense_len);
1388         req->dev->sense_len = req->sense_len;
1389         req->dev->sense_is_ua = (req->ops == &reqops_unit_attention);
1390     } else {
1391         req->dev->sense_len = 0;
1392         req->dev->sense_is_ua = false;
1393     }
1394
1395     /*
1396      * Unit attention state is now stored in the device's sense buffer
1397      * if the HBA didn't do autosense.  Clear the pending unit attention
1398      * flags.
1399      */
1400     scsi_clear_unit_attention(req);
1401
1402     scsi_req_ref(req);
1403     scsi_req_dequeue(req);
1404     req->bus->info->complete(req, req->status, req->resid);
1405     scsi_req_unref(req);
1406 }
1407
1408 void scsi_req_cancel(SCSIRequest *req)
1409 {
1410     if (!req->enqueued) {
1411         return;
1412     }
1413     scsi_req_ref(req);
1414     scsi_req_dequeue(req);
1415     req->io_canceled = true;
1416     if (req->ops->cancel_io) {
1417         req->ops->cancel_io(req);
1418     }
1419     if (req->bus->info->cancel) {
1420         req->bus->info->cancel(req);
1421     }
1422     scsi_req_unref(req);
1423 }
1424
1425 void scsi_req_abort(SCSIRequest *req, int status)
1426 {
1427     if (!req->enqueued) {
1428         return;
1429     }
1430     scsi_req_ref(req);
1431     scsi_req_dequeue(req);
1432     req->io_canceled = true;
1433     if (req->ops->cancel_io) {
1434         req->ops->cancel_io(req);
1435     }
1436     scsi_req_complete(req, status);
1437     scsi_req_unref(req);
1438 }
1439
1440 void scsi_device_purge_requests(SCSIDevice *sdev, SCSISense sense)
1441 {
1442     SCSIRequest *req;
1443
1444     while (!QTAILQ_EMPTY(&sdev->requests)) {
1445         req = QTAILQ_FIRST(&sdev->requests);
1446         scsi_req_cancel(req);
1447     }
1448     sdev->unit_attention = sense;
1449 }
1450
1451 static char *scsibus_get_dev_path(DeviceState *dev)
1452 {
1453     SCSIDevice *d = DO_UPCAST(SCSIDevice, qdev, dev);
1454     DeviceState *hba = dev->parent_bus->parent;
1455     char *id = NULL;
1456     char *path;
1457
1458     if (hba && hba->parent_bus && hba->parent_bus->info->get_dev_path) {
1459         id = hba->parent_bus->info->get_dev_path(hba);
1460     }
1461     if (id) {
1462         path = g_strdup_printf("%s/%d:%d:%d", id, d->channel, d->id, d->lun);
1463     } else {
1464         path = g_strdup_printf("%d:%d:%d", d->channel, d->id, d->lun);
1465     }
1466     g_free(id);
1467     return path;
1468 }
1469
1470 static char *scsibus_get_fw_dev_path(DeviceState *dev)
1471 {
1472     SCSIDevice *d = SCSI_DEVICE(dev);
1473     char path[100];
1474
1475     snprintf(path, sizeof(path), "channel@%x/%s@%x,%x", d->channel,
1476              qdev_fw_name(dev), d->id, d->lun);
1477
1478     return strdup(path);
1479 }
1480
1481 SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun)
1482 {
1483     DeviceState *qdev;
1484     SCSIDevice *target_dev = NULL;
1485
1486     QTAILQ_FOREACH_REVERSE(qdev, &bus->qbus.children, ChildrenHead, sibling) {
1487         SCSIDevice *dev = SCSI_DEVICE(qdev);
1488
1489         if (dev->channel == channel && dev->id == id) {
1490             if (dev->lun == lun) {
1491                 return dev;
1492             }
1493             target_dev = dev;
1494         }
1495     }
1496     return target_dev;
1497 }
1498
1499 /* SCSI request list.  For simplicity, pv points to the whole device */
1500
1501 static void put_scsi_requests(QEMUFile *f, void *pv, size_t size)
1502 {
1503     SCSIDevice *s = pv;
1504     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);
1505     SCSIRequest *req;
1506
1507     QTAILQ_FOREACH(req, &s->requests, next) {
1508         assert(!req->io_canceled);
1509         assert(req->status == -1);
1510         assert(req->retry);
1511         assert(req->enqueued);
1512
1513         qemu_put_sbyte(f, 1);
1514         qemu_put_buffer(f, req->cmd.buf, sizeof(req->cmd.buf));
1515         qemu_put_be32s(f, &req->tag);
1516         qemu_put_be32s(f, &req->lun);
1517         if (bus->info->save_request) {
1518             bus->info->save_request(f, req);
1519         }
1520         if (req->ops->save_request) {
1521             req->ops->save_request(f, req);
1522         }
1523     }
1524     qemu_put_sbyte(f, 0);
1525 }
1526
1527 static int get_scsi_requests(QEMUFile *f, void *pv, size_t size)
1528 {
1529     SCSIDevice *s = pv;
1530     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);
1531
1532     while (qemu_get_sbyte(f)) {
1533         uint8_t buf[SCSI_CMD_BUF_SIZE];
1534         uint32_t tag;
1535         uint32_t lun;
1536         SCSIRequest *req;
1537
1538         qemu_get_buffer(f, buf, sizeof(buf));
1539         qemu_get_be32s(f, &tag);
1540         qemu_get_be32s(f, &lun);
1541         req = scsi_req_new(s, tag, lun, buf, NULL);
1542         if (bus->info->load_request) {
1543             req->hba_private = bus->info->load_request(f, req);
1544         }
1545         if (req->ops->load_request) {
1546             req->ops->load_request(f, req);
1547         }
1548
1549         /* Just restart it later.  */
1550         req->retry = true;
1551         scsi_req_enqueue_internal(req);
1552
1553         /* At this point, the request will be kept alive by the reference
1554          * added by scsi_req_enqueue_internal, so we can release our reference.
1555          * The HBA of course will add its own reference in the load_request
1556          * callback if it needs to hold on the SCSIRequest.
1557          */
1558         scsi_req_unref(req);
1559     }
1560
1561     return 0;
1562 }
1563
1564 static const VMStateInfo vmstate_info_scsi_requests = {
1565     .name = "scsi-requests",
1566     .get  = get_scsi_requests,
1567     .put  = put_scsi_requests,
1568 };
1569
1570 const VMStateDescription vmstate_scsi_device = {
1571     .name = "SCSIDevice",
1572     .version_id = 1,
1573     .minimum_version_id = 1,
1574     .minimum_version_id_old = 1,
1575     .fields = (VMStateField[]) {
1576         VMSTATE_UINT8(unit_attention.key, SCSIDevice),
1577         VMSTATE_UINT8(unit_attention.asc, SCSIDevice),
1578         VMSTATE_UINT8(unit_attention.ascq, SCSIDevice),
1579         VMSTATE_BOOL(sense_is_ua, SCSIDevice),
1580         VMSTATE_UINT8_ARRAY(sense, SCSIDevice, SCSI_SENSE_BUF_SIZE),
1581         VMSTATE_UINT32(sense_len, SCSIDevice),
1582         {
1583             .name         = "requests",
1584             .version_id   = 0,
1585             .field_exists = NULL,
1586             .size         = 0,   /* ouch */
1587             .info         = &vmstate_info_scsi_requests,
1588             .flags        = VMS_SINGLE,
1589             .offset       = 0,
1590         },
1591         VMSTATE_END_OF_LIST()
1592     }
1593 };
1594
1595 static void scsi_device_class_init(ObjectClass *klass, void *data)
1596 {
1597     DeviceClass *k = DEVICE_CLASS(klass);
1598     k->bus_info = &scsi_bus_info;
1599     k->init     = scsi_qdev_init;
1600     k->unplug   = qdev_simple_unplug_cb;
1601     k->exit     = scsi_qdev_exit;
1602 }
1603
1604 static TypeInfo scsi_device_type_info = {
1605     .name = TYPE_SCSI_DEVICE,
1606     .parent = TYPE_DEVICE,
1607     .instance_size = sizeof(SCSIDevice),
1608     .abstract = true,
1609     .class_size = sizeof(SCSIDeviceClass),
1610     .class_init = scsi_device_class_init,
1611 };
1612
1613 static void scsi_register_types(void)
1614 {
1615     type_register_static(&scsi_device_type_info);
1616 }
1617
1618 type_init(scsi_register_types)
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