aboutsummaryrefslogtreecommitdiff
path: root/hw/scsi-disk.c
blob: c6280fd5599c4103b33978a3af8fdd594345d3ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
/*
 * SCSI Device emulation
 *
 * Copyright (c) 2006 CodeSourcery.
 * Based on code by Fabrice Bellard
 *
 * Written by Paul Brook
 *
 * This code is licenced under the LGPL.
 *
 * Note that this file only handles the SCSI architecture model and device
 * commands.  Emultion of interface/link layer protocols is handled by
 * the host adapter emulation.
 */

//#define DEBUG_SCSI

#ifdef DEBUG_SCSI
#define DPRINTF(fmt, args...) \
do { printf("scsi-disk: " fmt , ##args); } while (0)
#else
#define DPRINTF(fmt, args...) do {} while(0)
#endif

#define BADF(fmt, args...) \
do { fprintf(stderr, "scsi-disk: " fmt , ##args); } while (0)

#include "vl.h"

#define SENSE_NO_SENSE        0
#define SENSE_NOT_READY       2
#define SENSE_HARDWARE_ERROR  4
#define SENSE_ILLEGAL_REQUEST 5

#define SCSI_DMA_BUF_SIZE    65536

typedef struct SCSIRequest {
    SCSIDevice *dev;
    uint32_t tag;
    /* ??? We should probably keep track of whether the data trasfer is
       a read or a write.  Currently we rely on the host getting it right.  */
    /* Both sector and sector_count are in terms of qemu 512 byte blocks.  */
    int sector;
    int sector_count;
    /* The amounnt of data in the buffer.  */
    int buf_len;
    uint8_t dma_buf[SCSI_DMA_BUF_SIZE];
    BlockDriverAIOCB *aiocb;
    struct SCSIRequest *next;
} SCSIRequest;

struct SCSIDevice
{
    BlockDriverState *bdrv;
    SCSIRequest *requests;
    /* The qemu block layer uses a fixed 512 byte sector size.
       This is the number of 512 byte blocks in a single scsi sector.  */
    int cluster_size;
    int sense;
    int tcq;
    /* Completion functions may be called from either scsi_{read,write}_data
       or from the AIO completion routines.  */
    scsi_completionfn completion;
    void *opaque;
};

/* Global pool of SCSIRequest structures.  */
static SCSIRequest *free_requests = NULL;

static SCSIRequest *scsi_new_request(SCSIDevice *s, uint32_t tag)
{
    SCSIRequest *r;

    if (free_requests) {
        r = free_requests;
        free_requests = r->next;
    } else {
        r = qemu_malloc(sizeof(SCSIRequest));
    }
    r->dev = s;
    r->tag = tag;
    r->sector_count = 0;
    r->buf_len = 0;
    r->aiocb = NULL;

    r->next = s->requests;
    s->requests = r;
    return r;
}

static void scsi_remove_request(SCSIRequest *r)
{
    SCSIRequest *last;
    SCSIDevice *s = r->dev;

    if (s->requests == r) {
        s->requests = r->next;
    } else {
        last = s->requests;
        while (last && last->next != r)
            last = last->next;
        if (last) {
            last->next = r->next;
        } else {
            BADF("Orphaned request\n");
        }
    }
    r->next = free_requests;
    free_requests = r;
}

static SCSIRequest *scsi_find_request(SCSIDevice *s, uint32_t tag)
{
    SCSIRequest *r;

    r = s->requests;
    while (r && r->tag != tag)
        r = r->next;

    return r;
}

/* Helper function for command completion.  */
static void scsi_command_complete(SCSIRequest *r, int sense)
{
    SCSIDevice *s = r->dev;
    uint32_t tag;
    DPRINTF("Command complete tag=0x%x sense=%d\n", r->tag, sense);
    s->sense = sense;
    tag = r->tag;
    scsi_remove_request(r);
    s->completion(s->opaque, SCSI_REASON_DONE, tag, sense);
}

/* Cancel a pending data transfer.  */
void scsi_cancel_io(SCSIDevice *s, uint32_t tag)
{
    SCSIRequest *r;
    DPRINTF("Cancel tag=0x%x\n", tag);
    r = scsi_find_request(s, tag);
    if (r) {
        if (r->aiocb)
            bdrv_aio_cancel(r->aiocb);
        r->aiocb = NULL;
        scsi_remove_request(r);
    }
}

static void scsi_read_complete(void * opaque, int ret)
{
    SCSIRequest *r = (SCSIRequest *)opaque;
    SCSIDevice *s = r->dev;

    if (ret) {
        DPRINTF("IO error\n");
        scsi_command_complete(r, SENSE_HARDWARE_ERROR);
        return;
    }
    DPRINTF("Data ready tag=0x%x len=%d\n", r->tag, r->buf_len);

    s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->buf_len);
}

/* Read more data from scsi device into buffer.  */
void scsi_read_data(SCSIDevice *s, uint32_t tag)
{
    SCSIRequest *r;
    uint32_t n;

    r = scsi_find_request(s, tag);
    if (!r) {
        BADF("Bad read tag 0x%x\n", tag);
        /* ??? This is the wrong error.  */
        scsi_command_complete(r, SENSE_HARDWARE_ERROR);
        return;
    }
    if (r->sector_count == (uint32_t)-1) {
        DPRINTF("Read buf_len=%d\n", r->buf_len);
        r->sector_count = 0;
        s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->buf_len);
        return;
    }
    DPRINTF("Read sector_count=%d\n", r->sector_count);
    if (r->sector_count == 0) {
        scsi_command_complete(r, SENSE_NO_SENSE);
        return;
    }

    n = r->sector_count;
    if (n > SCSI_DMA_BUF_SIZE / 512)
        n = SCSI_DMA_BUF_SIZE / 512;

    r->buf_len = n * 512;
    r->aiocb = bdrv_aio_read(s->bdrv, r->sector, r->dma_buf, n,
                             scsi_read_complete, r);
    if (r->aiocb == NULL)
        scsi_command_complete(r, SENSE_HARDWARE_ERROR);
    r->sector += n;
    r->sector_count -= n;
}

static void scsi_write_complete(void * opaque, int ret)
{
    SCSIRequest *r = (SCSIRequest *)opaque;
    SCSIDevice *s = r->dev;
    uint32_t len;

    if (ret) {
        fprintf(stderr, "scsi-disc: IO write error\n");
        exit(1);
    }

    r->aiocb = NULL;
    if (r->sector_count == 0) {
        scsi_command_complete(r, SENSE_NO_SENSE);
    } else {
        len = r->sector_count * 512;
        if (len > SCSI_DMA_BUF_SIZE) {
            len = SCSI_DMA_BUF_SIZE;
        }
        r->buf_len = len;
        DPRINTF("Write complete tag=0x%x more=%d\n", r->tag, len);
        s->completion(s->opaque, SCSI_REASON_DATA, r->tag, len);
    }
}

/* Write data to a scsi device.  Returns nonzero on failure.
   The transfer may complete asynchronously.  */
int scsi_write_data(SCSIDevice *s, uint32_t tag)
{
    SCSIRequest *r;
    uint32_t n;

    DPRINTF("Write data tag=0x%x\n", tag);
    r = scsi_find_request(s, tag);
    if (!r) {
        BADF("Bad write tag 0x%x\n", tag);
        scsi_command_complete(r, SENSE_HARDWARE_ERROR);
        return 1;
    }
    if (r->aiocb)
        BADF("Data transfer already in progress\n");
    n = r->buf_len / 512;
    if (n) {
        r->aiocb = bdrv_aio_write(s->bdrv, r->sector, r->dma_buf, n,
                                  scsi_write_complete, r);
        if (r->aiocb == NULL)
            scsi_command_complete(r, SENSE_HARDWARE_ERROR);
        r->sector += n;
        r->sector_count -= n;
    } else {
        /* Invoke completion routine to fetch data from host.  */
        scsi_write_complete(r, 0);
    }

    return 0;
}

/* Return a pointer to the data buffer.  */
uint8_t *scsi_get_buf(SCSIDevice *s, uint32_t tag)
{
    SCSIRequest *r;

    r = scsi_find_request(s, tag);
    if (!r) {
        BADF("Bad buffer tag 0x%x\n", tag);
        return NULL;
    }
    return r->dma_buf;
}

/* Execute a scsi command.  Returns the length of the data expected by the
   command.  This will be Positive for data transfers from the device
   (eg. disk reads), negative for transfers to the device (eg. disk writes),
   and zero if the command does not transfer any data.  */

int32_t scsi_send_command(SCSIDevice *s, uint32_t tag, uint8_t *buf, int lun)
{
    int64_t nb_sectors;
    uint32_t lba;
    uint32_t len;
    int cmdlen;
    int is_write;
    uint8_t command;
    uint8_t *outbuf;
    SCSIRequest *r;

    command = buf[0];
    r = scsi_find_request(s, tag);
    if (r) {
        BADF("Tag 0x%x already in use\n", tag);
        scsi_cancel_io(s, tag);
    }
    /* ??? Tags are not unique for different luns.  We only implement a
       single lun, so this should not matter.  */
    r = scsi_new_request(s, tag);
    outbuf = r->dma_buf;
    is_write = 0;
    DPRINTF("Command: lun=%d tag=0x%x data=0x%02x", lun, tag, buf[0]);
    switch (command >> 5) {
    case 0:
        lba = buf[3] | (buf[2] << 8) | ((buf[1] & 0x1f) << 16);
        len = buf[4];
        cmdlen = 6;
        break;
    case 1:
    case 2:
        lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
        len = buf[8] | (buf[7] << 8);
        cmdlen = 10;
        break;
    case 4:
        lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
        len = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24);
        cmdlen = 16;
        break;
    case 5:
        lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
        len = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24);
        cmdlen = 12;
        break;
    default:
        BADF("Unsupported command length, command %x\n", command);
        goto fail;
    }
#ifdef DEBUG_SCSI
    {
        int i;
        for (i = 1; i < cmdlen; i++) {
            printf(" 0x%02x", buf[i]);
        }
        printf("\n");
    }
#endif
    if (lun || buf[1] >> 5) {
        /* Only LUN 0 supported.  */
        DPRINTF("Unimplemented LUN %d\n", lun ? lun : buf[1] >> 5);
        goto fail;
    }
    switch (command) {
    case 0x0:
	DPRINTF("Test Unit Ready\n");
	break;
    case 0x03:
        DPRINTF("Request Sense (len %d)\n", len);
        if (len < 4)
            goto fail;
        memset(buf, 0, 4);
        outbuf[0] = 0xf0;
        outbuf[1] = 0;
        outbuf[2] = s->sense;
        r->buf_len = 4;
        break;
    case 0x12:
        DPRINTF("Inquiry (len %d)\n", len);
        if (len < 36) {
            BADF("Inquiry buffer too small (%d)\n", len);
        }
	memset(outbuf, 0, 36);
	if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
	    outbuf[0] = 5;
            outbuf[1] = 0x80;
	    memcpy(&outbuf[16], "QEMU CD-ROM    ", 16);
	} else {
	    outbuf[0] = 0;
	    memcpy(&outbuf[16], "QEMU HARDDISK  ", 16);
	}
	memcpy(&outbuf[8], "QEMU   ", 8);
        memcpy(&outbuf[32], QEMU_VERSION, 4);
        /* Identify device as SCSI-3 rev 1.
           Some later commands are also implemented. */
	outbuf[2] = 3;
	outbuf[3] = 2; /* Format 2 */
	outbuf[4] = 32;
        /* Sync data transfer and TCQ.  */
        outbuf[7] = 0x10 | (s->tcq ? 0x02 : 0);
	r->buf_len = 36;
	break;
    case 0x16:
        DPRINTF("Reserve(6)\n");
        if (buf[1] & 1)
            goto fail;
        break;
    case 0x17:
        DPRINTF("Release(6)\n");
        if (buf[1] & 1)
            goto fail;
        break;
    case 0x1a:
    case 0x5a:
        {
            uint8_t *p;
            int page;

            page = buf[2] & 0x3f;
            DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
            p = outbuf;
            memset(p, 0, 4);
            outbuf[1] = 0; /* Default media type.  */
            outbuf[3] = 0; /* Block descriptor length.  */
            if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
                outbuf[2] = 0x80; /* Readonly.  */
            }
            p += 4;
            if ((page == 8 || page == 0x3f)) {
                /* Caching page.  */
                p[0] = 8;
                p[1] = 0x12;
                p[2] = 4; /* WCE */
                p += 19;
            }
            if ((page == 0x3f || page == 0x2a)
                    && (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM)) {
                /* CD Capabilities and Mechanical Status page. */
                p[0] = 0x2a;
                p[1] = 0x14;
                p[2] = 3; // CD-R & CD-RW read
                p[3] = 0; // Writing not supported
                p[4] = 0x7f; /* Audio, composite, digital out,
                                         mode 2 form 1&2, multi session */
                p[5] = 0xff; /* CD DA, DA accurate, RW supported,
                                         RW corrected, C2 errors, ISRC,
                                         UPC, Bar code */
                p[6] = 0x2d | (bdrv_is_locked(s->bdrv)? 2 : 0);
                /* Locking supported, jumper present, eject, tray */
                p[7] = 0; /* no volume & mute control, no
                                      changer */
                p[8] = (50 * 176) >> 8; // 50x read speed
                p[9] = (50 * 176) & 0xff;
                p[10] = 0 >> 8; // No volume
                p[11] = 0 & 0xff;
                p[12] = 2048 >> 8; // 2M buffer
                p[13] = 2048 & 0xff;
                p[14] = (16 * 176) >> 8; // 16x read speed current
                p[15] = (16 * 176) & 0xff;
                p[18] = (16 * 176) >> 8; // 16x write speed
                p[19] = (16 * 176) & 0xff;
                p[20] = (16 * 176) >> 8; // 16x write speed current
                p[21] = (16 * 176) & 0xff;
                p += 21;
            }
            r->buf_len = p - outbuf;
            outbuf[0] = r->buf_len - 4;
            if (r->buf_len > len)
                r->buf_len = len;
        }
        break;
    case 0x1b:
        DPRINTF("Start Stop Unit\n");
	break;
    case 0x1e:
        DPRINTF("Prevent Allow Medium Removal (prevent = %d)\n", buf[4] & 3);
        bdrv_set_locked(s->bdrv, buf[4] & 1);
	break;
    case 0x25:
	DPRINTF("Read Capacity\n");
        /* The normal LEN field for this command is zero.  */
	memset(outbuf, 0, 8);
	bdrv_get_geometry(s->bdrv, &nb_sectors);
        /* Returned value is the address of the last sector.  */
        if (nb_sectors) {
            nb_sectors--;
            outbuf[0] = (nb_sectors >> 24) & 0xff;
            outbuf[1] = (nb_sectors >> 16) & 0xff;
            outbuf[2] = (nb_sectors >> 8) & 0xff;
            outbuf[3] = nb_sectors & 0xff;
            outbuf[4] = 0;
            outbuf[5] = 0;
            outbuf[6] = s->cluster_size * 2;
            outbuf[7] = 0;
            r->buf_len = 8;
        } else {
            scsi_command_complete(r, SENSE_NOT_READY);
            return 0;
        }
	break;
    case 0x08:
    case 0x28:
        DPRINTF("Read (sector %d, count %d)\n", lba, len);
        r->sector = lba * s->cluster_size;
        r->sector_count = len * s->cluster_size;
        break;
    case 0x0a:
    case 0x2a:
        DPRINTF("Write (sector %d, count %d)\n", lba, len);
        r->sector = lba * s->cluster_size;
        r->sector_count = len * s->cluster_size;
        is_write = 1;
        break;
    case 0x35:
        DPRINTF("Syncronise cache (sector %d, count %d)\n", lba, len);
        bdrv_flush(s->bdrv);
        break;
    case 0x43:
        {
            int start_track, format, msf, toclen;

            msf = buf[1] & 2;
            format = buf[2] & 0xf;
            start_track = buf[6];
            bdrv_get_geometry(s->bdrv, &nb_sectors);
            DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1);
            switch(format) {
            case 0:
                toclen = cdrom_read_toc(nb_sectors, outbuf, msf, start_track);
                break;
            case 1:
                /* multi session : only a single session defined */
                toclen = 12;
                memset(outbuf, 0, 12);
                outbuf[1] = 0x0a;
                outbuf[2] = 0x01;
                outbuf[3] = 0x01;
                break;
            case 2:
                toclen = cdrom_read_toc_raw(nb_sectors, outbuf, msf, start_track);
                break;
            default:
                goto error_cmd;
            }
            if (toclen > 0) {
                if (len > toclen)
                  len = toclen;
                r->buf_len = len;
                break;
            }
        error_cmd:
            DPRINTF("Read TOC error\n");
            goto fail;
        }
    case 0x46:
        DPRINTF("Get Configuration (rt %d, maxlen %d)\n", buf[1] & 3, len);
        memset(outbuf, 0, 8);
        /* ??? This shoud probably return much more information.  For now
           just return the basic header indicating the CD-ROM profile.  */
        outbuf[7] = 8; // CD-ROM
        r->buf_len = 8;
        break;
    case 0x56:
        DPRINTF("Reserve(10)\n");
        if (buf[1] & 3)
            goto fail;
        break;
    case 0x57:
        DPRINTF("Release(10)\n");
        if (buf[1] & 3)
            goto fail;
        break;
    case 0xa0:
        DPRINTF("Report LUNs (len %d)\n", len);
        if (len < 16)
            goto fail;
        memset(outbuf, 0, 16);
        outbuf[3] = 8;
        r->buf_len = 16;
        break;
    default:
	DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]);
    fail:
        scsi_command_complete(r, SENSE_ILLEGAL_REQUEST);
	return 0;
    }
    if (r->sector_count == 0 && r->buf_len == 0) {
        scsi_command_complete(r, SENSE_NO_SENSE);
    }
    len = r->sector_count * 512 + r->buf_len;
    if (is_write) {
        return -len;
    } else {
        if (!r->sector_count)
            r->sector_count = -1;
        return len;
    }
}

void scsi_disk_destroy(SCSIDevice *s)
{
    qemu_free(s);
}

SCSIDevice *scsi_disk_init(BlockDriverState *bdrv,
                           int tcq,
                           scsi_completionfn completion,
                           void *opaque)
{
    SCSIDevice *s;

    s = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
    s->bdrv = bdrv;
    s->tcq = tcq;
    s->completion = completion;
    s->opaque = opaque;
    if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
        s->cluster_size = 4;
    } else {
        s->cluster_size = 1;
    }

    return s;
}