root / hw / scsi-generic.c @ e8ee3c72
History | View | Annotate | Download (15.3 kB)
1 |
/*
|
---|---|
2 |
* Generic SCSI Device support
|
3 |
*
|
4 |
* Copyright (c) 2007 Bull S.A.S.
|
5 |
* Based on code by Paul Brook
|
6 |
* Based on code by Fabrice Bellard
|
7 |
*
|
8 |
* Written by Laurent Vivier <Laurent.Vivier@bull.net>
|
9 |
*
|
10 |
* This code is licenced under the LGPL.
|
11 |
*
|
12 |
*/
|
13 |
|
14 |
#include "qemu-common.h" |
15 |
#include "block.h" |
16 |
#include "scsi-disk.h" |
17 |
|
18 |
#ifndef __linux__
|
19 |
|
20 |
SCSIDevice *scsi_generic_init(BlockDriverState *bdrv, int tcq,
|
21 |
scsi_completionfn completion, void *opaque)
|
22 |
{ |
23 |
return NULL; |
24 |
} |
25 |
|
26 |
#else /* __linux__ */ |
27 |
|
28 |
//#define DEBUG_SCSI
|
29 |
|
30 |
#ifdef DEBUG_SCSI
|
31 |
#define DPRINTF(fmt, args...) \
|
32 |
do { printf("scsi-generic: " fmt , ##args); } while (0) |
33 |
#else
|
34 |
#define DPRINTF(fmt, args...) do {} while(0) |
35 |
#endif
|
36 |
|
37 |
#define BADF(fmt, args...) \
|
38 |
do { fprintf(stderr, "scsi-generic: " fmt , ##args); } while (0) |
39 |
|
40 |
#include <stdio.h> |
41 |
#include <sys/types.h> |
42 |
#include <sys/stat.h> |
43 |
#include <unistd.h> |
44 |
#include <scsi/sg.h> |
45 |
#include <scsi/scsi.h> |
46 |
|
47 |
#define LOAD_UNLOAD 0xa6 |
48 |
#define SET_CD_SPEED 0xbb |
49 |
#define BLANK 0xa1 |
50 |
|
51 |
#define SCSI_CMD_BUF_SIZE 16 |
52 |
#define SCSI_SENSE_BUF_SIZE 32 |
53 |
|
54 |
#define SG_ERR_DRIVER_TIMEOUT 0x06 |
55 |
#define SG_ERR_DRIVER_SENSE 0x08 |
56 |
|
57 |
#ifndef MAX_UINT
|
58 |
#define MAX_UINT ((unsigned int)-1) |
59 |
#endif
|
60 |
|
61 |
typedef struct SCSIRequest { |
62 |
BlockDriverAIOCB *aiocb; |
63 |
struct SCSIRequest *next;
|
64 |
SCSIDeviceState *dev; |
65 |
uint32_t tag; |
66 |
uint8_t cmd[SCSI_CMD_BUF_SIZE]; |
67 |
int cmdlen;
|
68 |
uint8_t *buf; |
69 |
int buflen;
|
70 |
int len;
|
71 |
sg_io_hdr_t io_header; |
72 |
} SCSIRequest; |
73 |
|
74 |
struct SCSIDeviceState
|
75 |
{ |
76 |
SCSIRequest *requests; |
77 |
BlockDriverState *bdrv; |
78 |
int blocksize;
|
79 |
int lun;
|
80 |
scsi_completionfn completion; |
81 |
void *opaque;
|
82 |
int driver_status;
|
83 |
uint8_t sensebuf[SCSI_SENSE_BUF_SIZE]; |
84 |
}; |
85 |
|
86 |
/* Global pool of SCSIRequest structures. */
|
87 |
static SCSIRequest *free_requests = NULL; |
88 |
|
89 |
static SCSIRequest *scsi_new_request(SCSIDeviceState *s, uint32_t tag)
|
90 |
{ |
91 |
SCSIRequest *r; |
92 |
|
93 |
if (free_requests) {
|
94 |
r = free_requests; |
95 |
free_requests = r->next; |
96 |
} else {
|
97 |
r = qemu_malloc(sizeof(SCSIRequest));
|
98 |
r->buf = NULL;
|
99 |
r->buflen = 0;
|
100 |
} |
101 |
r->dev = s; |
102 |
r->tag = tag; |
103 |
memset(r->cmd, 0, sizeof(r->cmd)); |
104 |
memset(&r->io_header, 0, sizeof(r->io_header)); |
105 |
r->cmdlen = 0;
|
106 |
r->len = 0;
|
107 |
r->aiocb = NULL;
|
108 |
|
109 |
/* link */
|
110 |
|
111 |
r->next = s->requests; |
112 |
s->requests = r; |
113 |
return r;
|
114 |
} |
115 |
|
116 |
static void scsi_remove_request(SCSIRequest *r) |
117 |
{ |
118 |
SCSIRequest *last; |
119 |
SCSIDeviceState *s = r->dev; |
120 |
|
121 |
if (s->requests == r) {
|
122 |
s->requests = r->next; |
123 |
} else {
|
124 |
last = s->requests; |
125 |
while (last && last->next != r)
|
126 |
last = last->next; |
127 |
if (last) {
|
128 |
last->next = r->next; |
129 |
} else {
|
130 |
BADF("Orphaned request\n");
|
131 |
} |
132 |
} |
133 |
r->next = free_requests; |
134 |
free_requests = r; |
135 |
} |
136 |
|
137 |
static SCSIRequest *scsi_find_request(SCSIDeviceState *s, uint32_t tag)
|
138 |
{ |
139 |
SCSIRequest *r; |
140 |
|
141 |
r = s->requests; |
142 |
while (r && r->tag != tag)
|
143 |
r = r->next; |
144 |
|
145 |
return r;
|
146 |
} |
147 |
|
148 |
/* Helper function for command completion. */
|
149 |
static void scsi_command_complete(void *opaque, int ret) |
150 |
{ |
151 |
SCSIRequest *r = (SCSIRequest *)opaque; |
152 |
SCSIDeviceState *s = r->dev; |
153 |
uint32_t tag; |
154 |
int sense;
|
155 |
|
156 |
s->driver_status = r->io_header.driver_status; |
157 |
if (ret != 0) |
158 |
sense = HARDWARE_ERROR; |
159 |
else {
|
160 |
if (s->driver_status & SG_ERR_DRIVER_TIMEOUT) {
|
161 |
sense = HARDWARE_ERROR; |
162 |
BADF("Driver Timeout\n");
|
163 |
} else if ((s->driver_status & SG_ERR_DRIVER_SENSE) == 0) |
164 |
sense = NO_SENSE; |
165 |
else
|
166 |
sense = s->sensebuf[2] & 0x0f; |
167 |
} |
168 |
|
169 |
DPRINTF("Command complete 0x%p tag=0x%x sense=%d\n", r, r->tag, sense);
|
170 |
tag = r->tag; |
171 |
scsi_remove_request(r); |
172 |
s->completion(s->opaque, SCSI_REASON_DONE, tag, sense); |
173 |
} |
174 |
|
175 |
/* Cancel a pending data transfer. */
|
176 |
static void scsi_cancel_io(SCSIDevice *d, uint32_t tag) |
177 |
{ |
178 |
DPRINTF("scsi_cancel_io 0x%x\n", tag);
|
179 |
SCSIDeviceState *s = d->state; |
180 |
SCSIRequest *r; |
181 |
DPRINTF("Cancel tag=0x%x\n", tag);
|
182 |
r = scsi_find_request(s, tag); |
183 |
if (r) {
|
184 |
if (r->aiocb)
|
185 |
bdrv_aio_cancel(r->aiocb); |
186 |
r->aiocb = NULL;
|
187 |
scsi_remove_request(r); |
188 |
} |
189 |
} |
190 |
|
191 |
static int execute_command(BlockDriverState *bdrv, |
192 |
SCSIRequest *r, int direction,
|
193 |
BlockDriverCompletionFunc *complete) |
194 |
{ |
195 |
|
196 |
r->io_header.interface_id = 'S';
|
197 |
r->io_header.dxfer_direction = direction; |
198 |
r->io_header.dxferp = r->buf; |
199 |
r->io_header.dxfer_len = r->buflen; |
200 |
r->io_header.cmdp = r->cmd; |
201 |
r->io_header.cmd_len = r->cmdlen; |
202 |
r->io_header.mx_sb_len = sizeof(r->dev->sensebuf);
|
203 |
r->io_header.sbp = r->dev->sensebuf; |
204 |
r->io_header.timeout = MAX_UINT; |
205 |
r->io_header.usr_ptr = r; |
206 |
r->io_header.flags |= SG_FLAG_DIRECT_IO; |
207 |
|
208 |
if (bdrv_pwrite(bdrv, -1, &r->io_header, sizeof(r->io_header)) == -1) { |
209 |
BADF("execute_command: write failed ! (%d)\n", errno);
|
210 |
return -1; |
211 |
} |
212 |
if (complete == NULL) { |
213 |
int ret;
|
214 |
r->aiocb = NULL;
|
215 |
while ((ret = bdrv_pread(bdrv, -1, &r->io_header, |
216 |
sizeof(r->io_header))) == -1 && |
217 |
errno == EINTR); |
218 |
if (ret == -1) { |
219 |
BADF("execute_command: read failed !\n");
|
220 |
return -1; |
221 |
} |
222 |
return 0; |
223 |
} |
224 |
|
225 |
r->aiocb = bdrv_aio_read(bdrv, 0, (uint8_t*)&r->io_header,
|
226 |
-(int64_t)sizeof(r->io_header), complete, r);
|
227 |
if (r->aiocb == NULL) { |
228 |
BADF("execute_command: read failed !\n");
|
229 |
return -1; |
230 |
} |
231 |
|
232 |
return 0; |
233 |
} |
234 |
|
235 |
static void scsi_read_complete(void * opaque, int ret) |
236 |
{ |
237 |
SCSIRequest *r = (SCSIRequest *)opaque; |
238 |
SCSIDeviceState *s = r->dev; |
239 |
int len;
|
240 |
|
241 |
if (ret) {
|
242 |
DPRINTF("IO error\n");
|
243 |
scsi_command_complete(r, ret); |
244 |
return;
|
245 |
} |
246 |
len = r->io_header.dxfer_len - r->io_header.resid; |
247 |
DPRINTF("Data ready tag=0x%x len=%d\n", r->tag, len);
|
248 |
|
249 |
r->len = -1;
|
250 |
s->completion(s->opaque, SCSI_REASON_DATA, r->tag, len); |
251 |
} |
252 |
|
253 |
/* Read more data from scsi device into buffer. */
|
254 |
static void scsi_read_data(SCSIDevice *d, uint32_t tag) |
255 |
{ |
256 |
SCSIDeviceState *s = d->state; |
257 |
SCSIRequest *r; |
258 |
int ret;
|
259 |
|
260 |
DPRINTF("scsi_read_data 0x%x\n", tag);
|
261 |
r = scsi_find_request(s, tag); |
262 |
if (!r) {
|
263 |
BADF("Bad read tag 0x%x\n", tag);
|
264 |
/* ??? This is the wrong error. */
|
265 |
scsi_command_complete(r, -EINVAL); |
266 |
return;
|
267 |
} |
268 |
|
269 |
if (r->len == -1) { |
270 |
scsi_command_complete(r, 0);
|
271 |
return;
|
272 |
} |
273 |
|
274 |
if (r->cmd[0] == REQUEST_SENSE && s->driver_status & SG_ERR_DRIVER_SENSE) |
275 |
{ |
276 |
memcpy(r->buf, s->sensebuf, 16);
|
277 |
r->io_header.driver_status = 0;
|
278 |
r->len = -1;
|
279 |
s->completion(s->opaque, SCSI_REASON_DATA, r->tag, 16);
|
280 |
return;
|
281 |
} |
282 |
|
283 |
ret = execute_command(s->bdrv, r, SG_DXFER_FROM_DEV, scsi_read_complete); |
284 |
if (ret == -1) { |
285 |
scsi_command_complete(r, -EINVAL); |
286 |
return;
|
287 |
} |
288 |
} |
289 |
|
290 |
static void scsi_write_complete(void * opaque, int ret) |
291 |
{ |
292 |
SCSIRequest *r = (SCSIRequest *)opaque; |
293 |
|
294 |
DPRINTF("scsi_write_complete() ret = %d\n", ret);
|
295 |
if (ret) {
|
296 |
DPRINTF("IO error\n");
|
297 |
scsi_command_complete(r, ret); |
298 |
return;
|
299 |
} |
300 |
|
301 |
scsi_command_complete(r, ret); |
302 |
} |
303 |
|
304 |
/* Write data to a scsi device. Returns nonzero on failure.
|
305 |
The transfer may complete asynchronously. */
|
306 |
static int scsi_write_data(SCSIDevice *d, uint32_t tag) |
307 |
{ |
308 |
SCSIDeviceState *s = d->state; |
309 |
SCSIRequest *r; |
310 |
int ret;
|
311 |
|
312 |
DPRINTF("scsi_write_data 0x%x\n", tag);
|
313 |
r = scsi_find_request(s, tag); |
314 |
if (!r) {
|
315 |
BADF("Bad write tag 0x%x\n", tag);
|
316 |
/* ??? This is the wrong error. */
|
317 |
scsi_command_complete(r, -EINVAL); |
318 |
return 0; |
319 |
} |
320 |
|
321 |
if (r->len == 0) { |
322 |
r->len = r->buflen; |
323 |
s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->len); |
324 |
return 0; |
325 |
} |
326 |
|
327 |
ret = execute_command(s->bdrv, r, SG_DXFER_TO_DEV, scsi_write_complete); |
328 |
if (ret == -1) { |
329 |
scsi_command_complete(r, -EINVAL); |
330 |
return 1; |
331 |
} |
332 |
|
333 |
return 0; |
334 |
} |
335 |
|
336 |
/* Return a pointer to the data buffer. */
|
337 |
static uint8_t *scsi_get_buf(SCSIDevice *d, uint32_t tag)
|
338 |
{ |
339 |
SCSIDeviceState *s = d->state; |
340 |
SCSIRequest *r; |
341 |
r = scsi_find_request(s, tag); |
342 |
if (!r) {
|
343 |
BADF("Bad buffer tag 0x%x\n", tag);
|
344 |
return NULL; |
345 |
} |
346 |
return r->buf;
|
347 |
} |
348 |
|
349 |
static int scsi_length(uint8_t *cmd, int blocksize, int *cmdlen, uint32_t *len) |
350 |
{ |
351 |
switch (cmd[0] >> 5) { |
352 |
case 0: |
353 |
*len = cmd[4];
|
354 |
*cmdlen = 6;
|
355 |
break;
|
356 |
case 1: |
357 |
case 2: |
358 |
*len = cmd[8] | (cmd[7] << 8); |
359 |
*cmdlen = 10;
|
360 |
break;
|
361 |
case 4: |
362 |
*len = cmd[13] | (cmd[12] << 8) | (cmd[11] << 16) | (cmd[10] << 24); |
363 |
*cmdlen = 16;
|
364 |
break;
|
365 |
case 5: |
366 |
*len = cmd[9] | (cmd[8] << 8) | (cmd[7] << 16) | (cmd[6] << 24); |
367 |
*cmdlen = 12;
|
368 |
break;
|
369 |
default:
|
370 |
return -1; |
371 |
} |
372 |
|
373 |
switch(cmd[0]) { |
374 |
case TEST_UNIT_READY:
|
375 |
case REZERO_UNIT:
|
376 |
case START_STOP:
|
377 |
case SEEK_6:
|
378 |
case WRITE_FILEMARKS:
|
379 |
case SPACE:
|
380 |
case ERASE:
|
381 |
case ALLOW_MEDIUM_REMOVAL:
|
382 |
case VERIFY:
|
383 |
case SEEK_10:
|
384 |
case SYNCHRONIZE_CACHE:
|
385 |
case LOCK_UNLOCK_CACHE:
|
386 |
case LOAD_UNLOAD:
|
387 |
case SET_CD_SPEED:
|
388 |
case SET_LIMITS:
|
389 |
case WRITE_LONG:
|
390 |
case MOVE_MEDIUM:
|
391 |
case UPDATE_BLOCK:
|
392 |
*len = 0;
|
393 |
break;
|
394 |
case MODE_SENSE:
|
395 |
break;
|
396 |
case WRITE_SAME:
|
397 |
*len = 1;
|
398 |
break;
|
399 |
case READ_CAPACITY:
|
400 |
*len = 8;
|
401 |
break;
|
402 |
case READ_BLOCK_LIMITS:
|
403 |
*len = 6;
|
404 |
break;
|
405 |
case READ_POSITION:
|
406 |
*len = 20;
|
407 |
break;
|
408 |
case SEND_VOLUME_TAG:
|
409 |
*len *= 40;
|
410 |
break;
|
411 |
case MEDIUM_SCAN:
|
412 |
*len *= 8;
|
413 |
break;
|
414 |
case WRITE_10:
|
415 |
cmd[1] &= ~0x08; /* disable FUA */ |
416 |
case WRITE_VERIFY:
|
417 |
case WRITE_6:
|
418 |
case WRITE_12:
|
419 |
case WRITE_VERIFY_12:
|
420 |
*len *= blocksize; |
421 |
break;
|
422 |
case READ_10:
|
423 |
cmd[1] &= ~0x08; /* disable FUA */ |
424 |
case READ_6:
|
425 |
case READ_REVERSE:
|
426 |
case RECOVER_BUFFERED_DATA:
|
427 |
case READ_12:
|
428 |
*len *= blocksize; |
429 |
break;
|
430 |
} |
431 |
return 0; |
432 |
} |
433 |
|
434 |
static int is_write(int command) |
435 |
{ |
436 |
switch (command) {
|
437 |
case COPY:
|
438 |
case COPY_VERIFY:
|
439 |
case COMPARE:
|
440 |
case CHANGE_DEFINITION:
|
441 |
case LOG_SELECT:
|
442 |
case MODE_SELECT:
|
443 |
case MODE_SELECT_10:
|
444 |
case SEND_DIAGNOSTIC:
|
445 |
case WRITE_BUFFER:
|
446 |
case FORMAT_UNIT:
|
447 |
case REASSIGN_BLOCKS:
|
448 |
case RESERVE:
|
449 |
case SEARCH_EQUAL:
|
450 |
case SEARCH_HIGH:
|
451 |
case SEARCH_LOW:
|
452 |
case WRITE_6:
|
453 |
case WRITE_10:
|
454 |
case WRITE_VERIFY:
|
455 |
case UPDATE_BLOCK:
|
456 |
case WRITE_LONG:
|
457 |
case WRITE_SAME:
|
458 |
case SEARCH_HIGH_12:
|
459 |
case SEARCH_EQUAL_12:
|
460 |
case SEARCH_LOW_12:
|
461 |
case WRITE_12:
|
462 |
case WRITE_VERIFY_12:
|
463 |
case SET_WINDOW:
|
464 |
case MEDIUM_SCAN:
|
465 |
case SEND_VOLUME_TAG:
|
466 |
case WRITE_LONG_2:
|
467 |
return 1; |
468 |
} |
469 |
return 0; |
470 |
} |
471 |
|
472 |
/* Execute a scsi command. Returns the length of the data expected by the
|
473 |
command. This will be Positive for data transfers from the device
|
474 |
(eg. disk reads), negative for transfers to the device (eg. disk writes),
|
475 |
and zero if the command does not transfer any data. */
|
476 |
|
477 |
static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
|
478 |
uint8_t *cmd, int lun)
|
479 |
{ |
480 |
SCSIDeviceState *s = d->state; |
481 |
uint32_t len; |
482 |
int cmdlen;
|
483 |
SCSIRequest *r; |
484 |
int ret;
|
485 |
|
486 |
/* ??? Tags are not unique for different luns. We only implement a
|
487 |
single lun, so this should not matter. */
|
488 |
|
489 |
if (lun != s->lun || (cmd[1] >> 5) != s->lun) { |
490 |
DPRINTF("Unimplemented LUN %d\n", lun ? lun : cmd[1] >> 5); |
491 |
s->completion(s->opaque, SCSI_REASON_DONE, tag, ILLEGAL_REQUEST); |
492 |
return 0; |
493 |
} |
494 |
|
495 |
if (scsi_length(cmd, s->blocksize, &cmdlen, &len) == -1) { |
496 |
BADF("Unsupported command length, command %x\n", cmd[0]); |
497 |
return 0; |
498 |
} |
499 |
|
500 |
DPRINTF("Command: lun=%d tag=0x%x data=0x%02x len %d\n", lun, tag,
|
501 |
cmd[0], len);
|
502 |
|
503 |
r = scsi_find_request(s, tag); |
504 |
if (r) {
|
505 |
BADF("Tag 0x%x already in use %p\n", tag, r);
|
506 |
scsi_cancel_io(d, tag); |
507 |
} |
508 |
r = scsi_new_request(s, tag); |
509 |
|
510 |
memcpy(r->cmd, cmd, cmdlen); |
511 |
r->cmdlen = cmdlen; |
512 |
|
513 |
if (len == 0) { |
514 |
if (r->buf != NULL) |
515 |
free(r->buf); |
516 |
r->buflen = 0;
|
517 |
r->buf = NULL;
|
518 |
ret = execute_command(s->bdrv, r, SG_DXFER_NONE, scsi_command_complete); |
519 |
if (ret == -1) { |
520 |
scsi_command_complete(r, -EINVAL); |
521 |
return 0; |
522 |
} |
523 |
return 0; |
524 |
} |
525 |
|
526 |
if (r->buflen != len) {
|
527 |
if (r->buf != NULL) |
528 |
free(r->buf); |
529 |
r->buf = qemu_malloc(len); |
530 |
r->buflen = len; |
531 |
} |
532 |
|
533 |
memset(r->buf, 0, r->buflen);
|
534 |
r->len = len; |
535 |
if (is_write(cmd[0])) { |
536 |
r->len = 0;
|
537 |
return -len;
|
538 |
} |
539 |
|
540 |
return len;
|
541 |
} |
542 |
|
543 |
static int get_blocksize(BlockDriverState *bdrv) |
544 |
{ |
545 |
uint8_t cmd[10];
|
546 |
uint8_t buf[8];
|
547 |
uint8_t sensebuf[8];
|
548 |
sg_io_hdr_t io_header; |
549 |
int ret;
|
550 |
|
551 |
memset(cmd, sizeof(cmd), 0); |
552 |
memset(buf, sizeof(buf), 0); |
553 |
cmd[0] = READ_CAPACITY;
|
554 |
|
555 |
memset(&io_header, 0, sizeof(io_header)); |
556 |
io_header.interface_id = 'S';
|
557 |
io_header.dxfer_direction = SG_DXFER_FROM_DEV; |
558 |
io_header.dxfer_len = sizeof(buf);
|
559 |
io_header.dxferp = buf; |
560 |
io_header.cmdp = cmd; |
561 |
io_header.cmd_len = sizeof(cmd);
|
562 |
io_header.mx_sb_len = sizeof(sensebuf);
|
563 |
io_header.sbp = sensebuf; |
564 |
io_header.timeout = 6000; /* XXX */ |
565 |
|
566 |
ret = bdrv_pwrite(bdrv, -1, &io_header, sizeof(io_header)); |
567 |
if (ret == -1) |
568 |
return -1; |
569 |
|
570 |
while ((ret = bdrv_pread(bdrv, -1, &io_header, sizeof(io_header))) == -1 && |
571 |
errno == EINTR); |
572 |
|
573 |
if (ret == -1) |
574 |
return -1; |
575 |
|
576 |
return (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; |
577 |
} |
578 |
|
579 |
static void scsi_destroy(SCSIDevice *d) |
580 |
{ |
581 |
SCSIRequest *r, *n; |
582 |
|
583 |
r = d->state->requests; |
584 |
while (r) {
|
585 |
n = r->next; |
586 |
qemu_free(r); |
587 |
r = n; |
588 |
} |
589 |
|
590 |
r = free_requests; |
591 |
while (r) {
|
592 |
n = r->next; |
593 |
qemu_free(r); |
594 |
r = n; |
595 |
} |
596 |
|
597 |
qemu_free(d->state); |
598 |
qemu_free(d); |
599 |
} |
600 |
|
601 |
SCSIDevice *scsi_generic_init(BlockDriverState *bdrv, int tcq,
|
602 |
scsi_completionfn completion, void *opaque)
|
603 |
{ |
604 |
int sg_version;
|
605 |
SCSIDevice *d; |
606 |
SCSIDeviceState *s; |
607 |
struct sg_scsi_id scsiid;
|
608 |
|
609 |
/* check we are really using a /dev/sg* file */
|
610 |
|
611 |
if (!bdrv_is_sg(bdrv))
|
612 |
return NULL; |
613 |
|
614 |
/* check we are using a driver managing SG_IO (version 3 and after */
|
615 |
|
616 |
if (bdrv_ioctl(bdrv, SG_GET_VERSION_NUM, &sg_version) < 0 || |
617 |
sg_version < 30000)
|
618 |
return NULL; |
619 |
|
620 |
/* get LUN of the /dev/sg? */
|
621 |
|
622 |
if (bdrv_ioctl(bdrv, SG_GET_SCSI_ID, &scsiid))
|
623 |
return NULL; |
624 |
|
625 |
/* define device state */
|
626 |
|
627 |
s = (SCSIDeviceState *)qemu_mallocz(sizeof(SCSIDeviceState));
|
628 |
s->bdrv = bdrv; |
629 |
s->requests = NULL;
|
630 |
s->completion = completion; |
631 |
s->opaque = opaque; |
632 |
s->lun = scsiid.lun; |
633 |
s->blocksize = get_blocksize(s->bdrv); |
634 |
s->driver_status = 0;
|
635 |
memset(s->sensebuf, 0, sizeof(s->sensebuf)); |
636 |
/* removable media returns 0 if not present */
|
637 |
if (s->blocksize <= 0) |
638 |
s->blocksize = 2048;
|
639 |
|
640 |
/* define function to manage device */
|
641 |
|
642 |
d = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
|
643 |
d->state = s; |
644 |
d->destroy = scsi_destroy; |
645 |
d->send_command = scsi_send_command; |
646 |
d->read_data = scsi_read_data; |
647 |
d->write_data = scsi_write_data; |
648 |
d->cancel_io = scsi_cancel_io; |
649 |
d->get_buf = scsi_get_buf; |
650 |
|
651 |
return d;
|
652 |
} |
653 |
#endif /* __linux__ */ |