2 * SCSI Device emulation
4 * Copyright (c) 2006 CodeSourcery.
5 * Based on code by Fabrice Bellard
7 * Written by Paul Brook
9 * This code is licenced under the LGPL.
15 #define DPRINTF(fmt, args...) \
16 do { printf("scsi-disk: " fmt , ##args); } while (0)
18 #define DPRINTF(fmt, args...) do {} while(0)
21 #define BADF(fmt, args...) \
22 do { fprintf(stderr, "scsi-disk: " fmt , ##args); } while (0)
26 #define SENSE_NO_SENSE 0
27 #define SENSE_ILLEGAL_REQUEST 5
33 BlockDriverState *bdrv;
34 /* The qemu block layer uses a fixed 512 byte sector size.
35 This is the number of 512 byte blocks in a single scsi sector. */
37 /* When transfering data buf_pos and buf_len contain a partially
38 transferred block of data (or response to a command), and
39 sector/sector_count identify any remaining sectors.
40 Both sector and sector_count are in terms of qemu 512 byte blocks. */
41 /* ??? We should probably keep track of whether the data trasfer is
42 a read or a write. Currently we rely on the host getting it right. */
49 scsi_completionfn completion;
53 static void scsi_command_complete(SCSIDevice *s, int sense)
56 s->completion(s->opaque, s->tag, sense);
59 /* Read data from a scsi device. Returns nonzero on failure. */
60 int scsi_read_data(SCSIDevice *s, uint8_t *data, uint32_t len)
64 DPRINTF("Read %d (%d/%d)\n", len, s->buf_len, s->sector_count);
65 if (s->buf_len == 0 && s->sector_count == 0)
72 memcpy(data, s->buf + s->buf_pos, n);
82 if (n > s->sector_count)
86 bdrv_read(s->bdrv, s->sector, data, n);
93 if (len && s->sector_count) {
94 bdrv_read(s->bdrv, s->sector, s->buf, 1);
99 /* Recurse to complete the partial read. */
100 return scsi_read_data(s, data, len);
106 if (s->buf_len == 0 && s->sector_count == 0)
107 scsi_command_complete(s, SENSE_NO_SENSE);
112 /* Read data to a scsi device. Returns nonzero on failure. */
113 int scsi_write_data(SCSIDevice *s, uint8_t *data, uint32_t len)
117 DPRINTF("Write %d (%d/%d)\n", len, s->buf_len, s->sector_count);
118 if (s->buf_pos != 0) {
119 BADF("Bad state on write\n");
123 if (s->sector_count == 0)
126 if (s->buf_len != 0 || len < 512) {
127 n = 512 - s->buf_len;
131 memcpy(s->buf + s->buf_len, data, n);
135 if (s->buf_len == 512) {
136 /* A full sector has been accumulated. Write it to disk. */
137 bdrv_write(s->bdrv, s->sector, s->buf, 1);
145 if (n > s->sector_count)
149 bdrv_write(s->bdrv, s->sector, data, n);
153 s->sector_count -= n;
159 if (len && s->sector_count) {
160 /* Recurse to complete the partial write. */
161 return scsi_write_data(s, data, len);
167 if (s->sector_count == 0)
168 scsi_command_complete(s, SENSE_NO_SENSE);
173 /* Execute a scsi command. Returns the length of the data expected by the
174 command. This will be Positive for data transfers from the device
175 (eg. disk reads), negative for transfers to the device (eg. disk writes),
176 and zero if the command does not transfer any data. */
178 int32_t scsi_send_command(SCSIDevice *s, uint32_t tag, uint8_t *buf, int lun)
192 DPRINTF("Command: 0x%02x", buf[0]);
193 switch (s->command >> 5) {
195 lba = buf[3] | (buf[2] << 8) | ((buf[1] & 0x1f) << 16);
201 lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
202 len = buf[8] | (buf[7] << 8);
206 lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
207 len = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24);
211 lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
212 len = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24);
216 BADF("Unsupported command length\n");
222 for (i = 1; i < cmdlen; i++) {
223 printf(" 0x%02x", buf[i]);
228 if (lun || buf[1] >> 5) {
229 /* Only LUN 0 supported. */
230 DPRINTF("Unimplemented LUN %d\n", lun ? lun : buf[1] >> 5);
233 switch (s->command) {
235 DPRINTF("Test Unit Ready\n");
238 DPRINTF("Request Sense (len %d)\n", len);
244 s->buf[2] = s->sense;
248 DPRINTF("Inquiry (len %d)\n", len);
250 BADF("Inquiry buffer too small (%d)\n", len);
252 memset(s->buf, 0, 36);
253 if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
256 memcpy(&s->buf[16], "QEMU CDROM ", 16);
259 memcpy(&s->buf[16], "QEMU HARDDISK ", 16);
261 memcpy(&s->buf[8], "QEMU ", 8);
262 s->buf[2] = 3; /* SCSI-3 */
263 s->buf[3] = 2; /* Format 2 */
268 DPRINTF("Reserve(6)\n");
273 DPRINTF("Release(6)\n");
278 DPRINTF("Mode Sense(6) (page %d, len %d)\n", buf[2], len);
279 memset(s->buf, 0, 4);
280 s->buf[0] = 0x16; /* Mode data length (4 + 0x12). */
281 s->buf[1] = 0; /* Default media type. */
282 s->buf[2] = 0; /* Write enabled. */
283 s->buf[3] = 0; /* Block descriptor length. */
286 s->buf[4 + 1] = 0x12;
287 s->buf[4 + 2] = 4; /* WCE */
293 DPRINTF("Read Capacity\n");
294 /* The normal LEN field for this command is zero. */
295 memset(s->buf, 0, 8);
296 bdrv_get_geometry(s->bdrv, &nb_sectors);
297 s->buf[0] = (nb_sectors >> 24) & 0xff;
298 s->buf[1] = (nb_sectors >> 16) & 0xff;
299 s->buf[2] = (nb_sectors >> 8) & 0xff;
300 s->buf[3] = nb_sectors & 0xff;
303 s->buf[6] = s->cluster_size * 2;
309 DPRINTF("Read (sector %d, count %d)\n", lba, len);
310 s->sector = lba * s->cluster_size;
311 s->sector_count = len * s->cluster_size;
315 DPRINTF("Write (sector %d, count %d)\n", lba, len);
316 s->sector = lba * s->cluster_size;
317 s->sector_count = len * s->cluster_size;
322 int start_track, format, msf, toclen;
325 format = buf[2] & 0xf;
326 start_track = buf[6];
327 bdrv_get_geometry(s->bdrv, &nb_sectors);
328 DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1);
331 toclen = cdrom_read_toc(nb_sectors, s->buf, msf, start_track);
334 /* multi session : only a single session defined */
336 memset(s->buf, 0, 12);
342 toclen = cdrom_read_toc_raw(nb_sectors, s->buf, msf, start_track);
354 DPRINTF("Read TOC error\n");
358 DPRINTF("Reserve(10)\n");
363 DPRINTF("Release(10)\n");
368 DPRINTF("Report LUNs (len %d)\n", len);
371 memset(s->buf, 0, 16);
376 DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]);
378 scsi_command_complete(s, SENSE_ILLEGAL_REQUEST);
381 if (s->sector_count == 0 && s->buf_len == 0) {
382 scsi_command_complete(s, SENSE_NO_SENSE);
384 len = s->sector_count * 512 + s->buf_len;
385 return is_write ? -len : len;
388 void scsi_disk_destroy(SCSIDevice *s)
394 SCSIDevice *scsi_disk_init(BlockDriverState *bdrv,
395 scsi_completionfn completion,
400 s = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
402 s->completion = completion;
404 if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {