root / hw / scsi-disk.c @ 35f1df84
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/*
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* SCSI Device emulation
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*
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* Copyright (c) 2006 CodeSourcery.
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* Based on code by Fabrice Bellard
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*
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* Written by Paul Brook
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*
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* This code is licenced under the LGPL.
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*/
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//#define DEBUG_SCSI
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#ifdef DEBUG_SCSI
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#define DPRINTF(fmt, args...) \
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do { printf("scsi-disk: " fmt , ##args); } while (0) |
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#else
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#define DPRINTF(fmt, args...) do {} while(0) |
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#endif
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#define BADF(fmt, args...) \
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do { fprintf(stderr, "scsi-disk: " fmt , ##args); } while (0) |
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#include "vl.h" |
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#define SENSE_NO_SENSE 0 |
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#define SENSE_NOT_READY 2 |
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#define SENSE_HARDWARE_ERROR 4 |
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#define SENSE_ILLEGAL_REQUEST 5 |
30 |
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struct SCSIDevice
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{ |
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int command;
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uint32_t tag; |
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BlockDriverState *bdrv; |
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/* The qemu block layer uses a fixed 512 byte sector size.
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This is the number of 512 byte blocks in a single scsi sector. */
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int cluster_size;
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/* When transfering data buf_pos and buf_len contain a partially
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transferred block of data (or response to a command), and
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sector/sector_count identify any remaining sectors.
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Both sector and sector_count are in terms of qemu 512 byte blocks. */
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/* ??? We should probably keep track of whether the data trasfer is
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a read or a write. Currently we rely on the host getting it right. */
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int sector;
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int sector_count;
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int buf_pos;
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int buf_len;
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int sense;
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BlockDriverAIOCB *aiocb; |
51 |
/* Data still to be transfered after this request completes. */
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uint8_t *aiodata; |
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uint32_t aiolen; |
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char buf[512]; |
55 |
/* Completion functions may be called from either scsi_{read,write}_data
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or from the AIO completion routines. */
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scsi_completionfn completion; |
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void *opaque;
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}; |
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static void scsi_command_complete(SCSIDevice *s, int sense) |
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{ |
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s->sense = sense; |
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s->completion(s->opaque, SCSI_REASON_DONE, sense); |
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} |
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|
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static void scsi_transfer_complete(SCSIDevice *s) |
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{ |
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s->completion(s->opaque, SCSI_REASON_DATA, 0);
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s->aiocb = NULL;
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} |
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static void scsi_read_complete(void * opaque, int ret) |
74 |
{ |
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SCSIDevice *s = (SCSIDevice *)opaque; |
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|
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if (ret) {
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DPRINTF("IO error\n");
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scsi_command_complete(s, SENSE_HARDWARE_ERROR); |
80 |
} |
81 |
|
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if (s->aiolen) {
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/* Read the remaining data. Full and partial sectors are transferred
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separately. */
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scsi_read_data(s, s->aiodata, s->aiolen); |
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} else {
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if (s->buf_len == 0 && s->sector_count == 0) |
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scsi_command_complete(s, SENSE_NO_SENSE); |
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else
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scsi_transfer_complete(s); |
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} |
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} |
93 |
|
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/* Cancel a pending data transfer. */
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void scsi_cancel_io(SCSIDevice *s)
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{ |
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if (!s->aiocb) {
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BADF("Cancel with no pending IO\n");
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return;
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} |
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bdrv_aio_cancel(s->aiocb); |
102 |
s->aiocb = NULL;
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} |
104 |
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/* Read data from a scsi device. Returns nonzero on failure.
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The transfer may complete asynchronously. */
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int scsi_read_data(SCSIDevice *s, uint8_t *data, uint32_t len)
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{ |
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uint32_t n; |
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DPRINTF("Read %d (%d/%d)\n", len, s->buf_len, s->sector_count);
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if (s->buf_len == 0 && s->sector_count == 0) |
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return 1; |
114 |
|
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if (s->buf_len) {
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n = s->buf_len; |
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if (n > len)
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n = len; |
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memcpy(data, s->buf + s->buf_pos, n); |
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s->buf_pos += n; |
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s->buf_len -= n; |
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data += n; |
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len -= n; |
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if (s->buf_len == 0) |
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s->buf_pos = 0;
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} |
127 |
|
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n = len / 512;
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if (n > s->sector_count)
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n = s->sector_count; |
131 |
|
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if (n != 0) { |
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s->aiolen = len - n * 512;
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s->aiodata = data + n * 512;
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s->aiocb = bdrv_aio_read(s->bdrv, s->sector, data, n, |
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scsi_read_complete, s); |
137 |
if (s->aiocb == NULL) |
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scsi_command_complete(s, SENSE_HARDWARE_ERROR); |
139 |
s->sector += n; |
140 |
s->sector_count -= n; |
141 |
return 0; |
142 |
} |
143 |
|
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if (len && s->sector_count) {
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/* TODO: Make this use AIO. */
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bdrv_read(s->bdrv, s->sector, s->buf, 1);
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s->sector++; |
148 |
s->sector_count--; |
149 |
s->buf_pos = 0;
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150 |
s->buf_len = 512;
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/* Recurse to complete the partial read. */
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return scsi_read_data(s, data, len);
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} |
154 |
|
155 |
if (len != 0) |
156 |
return 1; |
157 |
|
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if (s->buf_len == 0 && s->sector_count == 0) |
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scsi_command_complete(s, SENSE_NO_SENSE); |
160 |
else
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scsi_transfer_complete(s); |
162 |
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return 0; |
164 |
} |
165 |
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static void scsi_write_complete(void * opaque, int ret) |
167 |
{ |
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SCSIDevice *s = (SCSIDevice *)opaque; |
169 |
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if (ret) {
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fprintf(stderr, "scsi-disc: IO write error\n");
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exit(1);
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} |
174 |
|
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if (s->sector_count == 0) |
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scsi_command_complete(s, SENSE_NO_SENSE); |
177 |
else
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scsi_transfer_complete(s); |
179 |
} |
180 |
|
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static uint32_t scsi_write_partial_sector(SCSIDevice *s, uint8_t *data,
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uint32_t len) |
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{ |
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int n;
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n = 512 - s->buf_len;
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if (n > len)
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n = len; |
189 |
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memcpy(s->buf + s->buf_len, data, n); |
191 |
data += n; |
192 |
s->buf_len += n; |
193 |
len -= n; |
194 |
if (s->buf_len == 512) { |
195 |
/* A full sector has been accumulated. Write it to disk. */
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/* TODO: Make this use async IO. */
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bdrv_write(s->bdrv, s->sector, s->buf, 1);
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s->buf_len = 0;
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s->sector++; |
200 |
s->sector_count--; |
201 |
} |
202 |
return n;
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} |
204 |
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205 |
/* Write data to a scsi device. Returns nonzero on failure.
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The transfer may complete asynchronously. */
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int scsi_write_data(SCSIDevice *s, uint8_t *data, uint32_t len)
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{ |
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uint32_t n; |
210 |
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DPRINTF("Write %d (%d/%d)\n", len, s->buf_len, s->sector_count);
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if (s->buf_pos != 0) { |
213 |
BADF("Bad state on write\n");
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return 1; |
215 |
} |
216 |
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if (s->sector_count == 0) |
218 |
return 1; |
219 |
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220 |
if (s->buf_len != 0 || len < 512) { |
221 |
n = scsi_write_partial_sector(s, data, len); |
222 |
len -= n; |
223 |
data += n; |
224 |
} |
225 |
|
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n = len / 512;
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if (n > s->sector_count)
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return 1; |
229 |
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230 |
if (n != 0) { |
231 |
s->aiocb = bdrv_aio_write(s->bdrv, s->sector, data, n, |
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scsi_write_complete, s); |
233 |
if (s->aiocb == NULL) |
234 |
scsi_command_complete(s, SENSE_HARDWARE_ERROR); |
235 |
data += n * 512;
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len -= n * 512;
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s->sector += n; |
238 |
s->sector_count -= n; |
239 |
} |
240 |
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if (len) {
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if (s->sector_count == 0) |
243 |
return 1; |
244 |
/* Complete a partial write. */
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scsi_write_partial_sector(s, data, len); |
246 |
} |
247 |
if (n == 0) { |
248 |
/* Transfer completes immediately. */
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if (s->sector_count == 0) |
250 |
scsi_command_complete(s, SENSE_NO_SENSE); |
251 |
else
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scsi_transfer_complete(s); |
253 |
} |
254 |
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return 0; |
256 |
} |
257 |
|
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/* Execute a scsi command. Returns the length of the data expected by the
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command. This will be Positive for data transfers from the device
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(eg. disk reads), negative for transfers to the device (eg. disk writes),
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and zero if the command does not transfer any data. */
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262 |
|
263 |
int32_t scsi_send_command(SCSIDevice *s, uint32_t tag, uint8_t *buf, int lun)
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{ |
265 |
int64_t nb_sectors; |
266 |
uint32_t lba; |
267 |
uint32_t len; |
268 |
int cmdlen;
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int is_write;
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270 |
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s->command = buf[0];
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s->tag = tag; |
273 |
s->sector_count = 0;
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274 |
s->buf_pos = 0;
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s->buf_len = 0;
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is_write = 0;
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DPRINTF("Command: 0x%02x", buf[0]); |
278 |
switch (s->command >> 5) { |
279 |
case 0: |
280 |
lba = buf[3] | (buf[2] << 8) | ((buf[1] & 0x1f) << 16); |
281 |
len = buf[4];
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cmdlen = 6;
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283 |
break;
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284 |
case 1: |
285 |
case 2: |
286 |
lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
287 |
len = buf[8] | (buf[7] << 8); |
288 |
cmdlen = 10;
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break;
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290 |
case 4: |
291 |
lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
292 |
len = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24); |
293 |
cmdlen = 16;
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294 |
break;
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295 |
case 5: |
296 |
lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
297 |
len = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24); |
298 |
cmdlen = 12;
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299 |
break;
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300 |
default:
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301 |
BADF("Unsupported command length, command %x\n", s->command);
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302 |
goto fail;
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303 |
} |
304 |
#ifdef DEBUG_SCSI
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305 |
{ |
306 |
int i;
|
307 |
for (i = 1; i < cmdlen; i++) { |
308 |
printf(" 0x%02x", buf[i]);
|
309 |
} |
310 |
printf("\n");
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311 |
} |
312 |
#endif
|
313 |
if (lun || buf[1] >> 5) { |
314 |
/* Only LUN 0 supported. */
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315 |
DPRINTF("Unimplemented LUN %d\n", lun ? lun : buf[1] >> 5); |
316 |
goto fail;
|
317 |
} |
318 |
switch (s->command) {
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319 |
case 0x0: |
320 |
DPRINTF("Test Unit Ready\n");
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321 |
break;
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322 |
case 0x03: |
323 |
DPRINTF("Request Sense (len %d)\n", len);
|
324 |
if (len < 4) |
325 |
goto fail;
|
326 |
memset(buf, 0, 4); |
327 |
s->buf[0] = 0xf0; |
328 |
s->buf[1] = 0; |
329 |
s->buf[2] = s->sense;
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330 |
s->buf_len = 4;
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331 |
break;
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332 |
case 0x12: |
333 |
DPRINTF("Inquiry (len %d)\n", len);
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334 |
if (len < 36) { |
335 |
BADF("Inquiry buffer too small (%d)\n", len);
|
336 |
} |
337 |
memset(s->buf, 0, 36); |
338 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
339 |
s->buf[0] = 5; |
340 |
s->buf[1] = 0x80; |
341 |
memcpy(&s->buf[16], "QEMU CD-ROM ", 16); |
342 |
} else {
|
343 |
s->buf[0] = 0; |
344 |
memcpy(&s->buf[16], "QEMU HARDDISK ", 16); |
345 |
} |
346 |
memcpy(&s->buf[8], "QEMU ", 8); |
347 |
memcpy(&s->buf[32], QEMU_VERSION, 4); |
348 |
/* Identify device as SCSI-3 rev 1.
|
349 |
Some later commands are also implemented. */
|
350 |
s->buf[2] = 3; |
351 |
s->buf[3] = 2; /* Format 2 */ |
352 |
s->buf[4] = 32; |
353 |
s->buf_len = 36;
|
354 |
break;
|
355 |
case 0x16: |
356 |
DPRINTF("Reserve(6)\n");
|
357 |
if (buf[1] & 1) |
358 |
goto fail;
|
359 |
break;
|
360 |
case 0x17: |
361 |
DPRINTF("Release(6)\n");
|
362 |
if (buf[1] & 1) |
363 |
goto fail;
|
364 |
break;
|
365 |
case 0x1a: |
366 |
case 0x5a: |
367 |
{ |
368 |
char *p;
|
369 |
int page;
|
370 |
|
371 |
page = buf[2] & 0x3f; |
372 |
DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
|
373 |
p = s->buf; |
374 |
memset(p, 0, 4); |
375 |
s->buf[1] = 0; /* Default media type. */ |
376 |
s->buf[3] = 0; /* Block descriptor length. */ |
377 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
378 |
s->buf[2] = 0x80; /* Readonly. */ |
379 |
} |
380 |
p += 4;
|
381 |
if ((page == 8 || page == 0x3f)) { |
382 |
/* Caching page. */
|
383 |
p[0] = 8; |
384 |
p[1] = 0x12; |
385 |
p[2] = 4; /* WCE */ |
386 |
p += 19;
|
387 |
} |
388 |
if ((page == 0x3f || page == 0x2a) |
389 |
&& (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM)) { |
390 |
/* CD Capabilities and Mechanical Status page. */
|
391 |
p[0] = 0x2a; |
392 |
p[1] = 0x14; |
393 |
p[2] = 3; // CD-R & CD-RW read |
394 |
p[3] = 0; // Writing not supported |
395 |
p[4] = 0x7f; /* Audio, composite, digital out, |
396 |
mode 2 form 1&2, multi session */
|
397 |
p[5] = 0xff; /* CD DA, DA accurate, RW supported, |
398 |
RW corrected, C2 errors, ISRC,
|
399 |
UPC, Bar code */
|
400 |
p[6] = 0x2d | (bdrv_is_locked(s->bdrv)? 2 : 0); |
401 |
/* Locking supported, jumper present, eject, tray */
|
402 |
p[7] = 0; /* no volume & mute control, no |
403 |
changer */
|
404 |
p[8] = (50 * 176) >> 8; // 50x read speed |
405 |
p[9] = (50 * 176) & 0xff; |
406 |
p[10] = 0 >> 8; // No volume |
407 |
p[11] = 0 & 0xff; |
408 |
p[12] = 2048 >> 8; // 2M buffer |
409 |
p[13] = 2048 & 0xff; |
410 |
p[14] = (16 * 176) >> 8; // 16x read speed current |
411 |
p[15] = (16 * 176) & 0xff; |
412 |
p[18] = (16 * 176) >> 8; // 16x write speed |
413 |
p[19] = (16 * 176) & 0xff; |
414 |
p[20] = (16 * 176) >> 8; // 16x write speed current |
415 |
p[21] = (16 * 176) & 0xff; |
416 |
p += 21;
|
417 |
} |
418 |
s->buf_len = p - s->buf; |
419 |
s->buf[0] = s->buf_len - 4; |
420 |
if (s->buf_len > len)
|
421 |
s->buf_len = len; |
422 |
} |
423 |
break;
|
424 |
case 0x1b: |
425 |
DPRINTF("Start Stop Unit\n");
|
426 |
break;
|
427 |
case 0x1e: |
428 |
DPRINTF("Prevent Allow Medium Removal (prevent = %d)\n", buf[4] & 3); |
429 |
bdrv_set_locked(s->bdrv, buf[4] & 1); |
430 |
break;
|
431 |
case 0x25: |
432 |
DPRINTF("Read Capacity\n");
|
433 |
/* The normal LEN field for this command is zero. */
|
434 |
memset(s->buf, 0, 8); |
435 |
bdrv_get_geometry(s->bdrv, &nb_sectors); |
436 |
/* Returned value is the address of the last sector. */
|
437 |
if (nb_sectors) {
|
438 |
nb_sectors--; |
439 |
s->buf[0] = (nb_sectors >> 24) & 0xff; |
440 |
s->buf[1] = (nb_sectors >> 16) & 0xff; |
441 |
s->buf[2] = (nb_sectors >> 8) & 0xff; |
442 |
s->buf[3] = nb_sectors & 0xff; |
443 |
s->buf[4] = 0; |
444 |
s->buf[5] = 0; |
445 |
s->buf[6] = s->cluster_size * 2; |
446 |
s->buf[7] = 0; |
447 |
s->buf_len = 8;
|
448 |
} else {
|
449 |
scsi_command_complete(s, SENSE_NOT_READY); |
450 |
return 0; |
451 |
} |
452 |
break;
|
453 |
case 0x08: |
454 |
case 0x28: |
455 |
DPRINTF("Read (sector %d, count %d)\n", lba, len);
|
456 |
s->sector = lba * s->cluster_size; |
457 |
s->sector_count = len * s->cluster_size; |
458 |
break;
|
459 |
case 0x0a: |
460 |
case 0x2a: |
461 |
DPRINTF("Write (sector %d, count %d)\n", lba, len);
|
462 |
s->sector = lba * s->cluster_size; |
463 |
s->sector_count = len * s->cluster_size; |
464 |
is_write = 1;
|
465 |
break;
|
466 |
case 0x35: |
467 |
DPRINTF("Syncronise cache (sector %d, count %d)\n", lba, len);
|
468 |
bdrv_flush(s->bdrv); |
469 |
break;
|
470 |
case 0x43: |
471 |
{ |
472 |
int start_track, format, msf, toclen;
|
473 |
|
474 |
msf = buf[1] & 2; |
475 |
format = buf[2] & 0xf; |
476 |
start_track = buf[6];
|
477 |
bdrv_get_geometry(s->bdrv, &nb_sectors); |
478 |
DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1); |
479 |
switch(format) {
|
480 |
case 0: |
481 |
toclen = cdrom_read_toc(nb_sectors, s->buf, msf, start_track); |
482 |
break;
|
483 |
case 1: |
484 |
/* multi session : only a single session defined */
|
485 |
toclen = 12;
|
486 |
memset(s->buf, 0, 12); |
487 |
s->buf[1] = 0x0a; |
488 |
s->buf[2] = 0x01; |
489 |
s->buf[3] = 0x01; |
490 |
break;
|
491 |
case 2: |
492 |
toclen = cdrom_read_toc_raw(nb_sectors, s->buf, msf, start_track); |
493 |
break;
|
494 |
default:
|
495 |
goto error_cmd;
|
496 |
} |
497 |
if (toclen > 0) { |
498 |
if (len > toclen)
|
499 |
len = toclen; |
500 |
s->buf_len = len; |
501 |
break;
|
502 |
} |
503 |
error_cmd:
|
504 |
DPRINTF("Read TOC error\n");
|
505 |
goto fail;
|
506 |
} |
507 |
case 0x46: |
508 |
DPRINTF("Get Configuration (rt %d, maxlen %d)\n", buf[1] & 3, len); |
509 |
memset(s->buf, 0, 8); |
510 |
/* ??? This shoud probably return much more information. For now
|
511 |
just return the basic header indicating the CD-ROM profile. */
|
512 |
s->buf[7] = 8; // CD-ROM |
513 |
s->buf_len = 8;
|
514 |
break;
|
515 |
case 0x56: |
516 |
DPRINTF("Reserve(10)\n");
|
517 |
if (buf[1] & 3) |
518 |
goto fail;
|
519 |
break;
|
520 |
case 0x57: |
521 |
DPRINTF("Release(10)\n");
|
522 |
if (buf[1] & 3) |
523 |
goto fail;
|
524 |
break;
|
525 |
case 0xa0: |
526 |
DPRINTF("Report LUNs (len %d)\n", len);
|
527 |
if (len < 16) |
528 |
goto fail;
|
529 |
memset(s->buf, 0, 16); |
530 |
s->buf[3] = 8; |
531 |
s->buf_len = 16;
|
532 |
break;
|
533 |
default:
|
534 |
DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]); |
535 |
fail:
|
536 |
scsi_command_complete(s, SENSE_ILLEGAL_REQUEST); |
537 |
return 0; |
538 |
} |
539 |
if (s->sector_count == 0 && s->buf_len == 0) { |
540 |
scsi_command_complete(s, SENSE_NO_SENSE); |
541 |
} |
542 |
len = s->sector_count * 512 + s->buf_len;
|
543 |
return is_write ? -len : len;
|
544 |
} |
545 |
|
546 |
void scsi_disk_destroy(SCSIDevice *s)
|
547 |
{ |
548 |
bdrv_close(s->bdrv); |
549 |
qemu_free(s); |
550 |
} |
551 |
|
552 |
SCSIDevice *scsi_disk_init(BlockDriverState *bdrv, |
553 |
scsi_completionfn completion, |
554 |
void *opaque)
|
555 |
{ |
556 |
SCSIDevice *s; |
557 |
|
558 |
s = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
|
559 |
s->bdrv = bdrv; |
560 |
s->completion = completion; |
561 |
s->opaque = opaque; |
562 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
563 |
s->cluster_size = 4;
|
564 |
} else {
|
565 |
s->cluster_size = 1;
|
566 |
} |
567 |
|
568 |
return s;
|
569 |
} |
570 |
|