root / hw / scsi-disk.c @ 0986ac3b
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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_ILLEGAL_REQUEST 5 |
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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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char buf[512]; |
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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, s->tag, sense); |
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} |
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/* Read data from a scsi device. Returns nonzero on failure. */
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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; |
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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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} |
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n = len / 512;
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if (n > s->sector_count)
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n = s->sector_count; |
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if (n != 0) { |
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bdrv_read(s->bdrv, s->sector, data, n); |
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data += n * 512;
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len -= n * 512;
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s->sector += n; |
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s->sector_count -= n; |
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} |
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if (len && s->sector_count) {
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bdrv_read(s->bdrv, s->sector, s->buf, 1);
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s->sector++; |
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s->sector_count--; |
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s->buf_pos = 0;
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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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} |
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if (len != 0) |
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return 1; |
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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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return 0; |
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} |
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/* Read data to a scsi device. Returns nonzero on failure. */
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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; |
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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) { |
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BADF("Bad state on write\n");
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return 1; |
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} |
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if (s->sector_count == 0) |
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return 1; |
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if (s->buf_len != 0 || len < 512) { |
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n = 512 - s->buf_len;
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if (n > len)
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n = len; |
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memcpy(s->buf + s->buf_len, data, n); |
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data += n; |
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s->buf_len += n; |
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len -= n; |
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if (s->buf_len == 512) { |
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/* A full sector has been accumulated. Write it to disk. */
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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++; |
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s->sector_count--; |
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} |
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} |
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n = len / 512;
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if (n > s->sector_count)
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n = s->sector_count; |
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if (n != 0) { |
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bdrv_write(s->bdrv, s->sector, data, n); |
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data += n * 512;
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len -= n * 512;
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s->sector += n; |
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s->sector_count -= n; |
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} |
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if (len >= 512) |
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return 1; |
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if (len && s->sector_count) {
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/* Recurse to complete the partial write. */
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return scsi_write_data(s, data, len);
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} |
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if (len != 0) |
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return 1; |
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if (s->sector_count == 0) |
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scsi_command_complete(s, SENSE_NO_SENSE); |
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return 0; |
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} |
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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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int32_t scsi_send_command(SCSIDevice *s, uint32_t tag, uint8_t *buf, int lun)
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{ |
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int64_t nb_sectors; |
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uint32_t lba; |
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uint32_t len; |
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int cmdlen;
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int is_write;
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s->command = buf[0];
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s->tag = tag; |
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s->sector_count = 0;
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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]); |
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switch (s->command >> 5) { |
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case 0: |
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lba = buf[3] | (buf[2] << 8) | ((buf[1] & 0x1f) << 16); |
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len = buf[4];
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cmdlen = 6;
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break;
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case 1: |
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case 2: |
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lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
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len = buf[8] | (buf[7] << 8); |
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cmdlen = 10;
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break;
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case 4: |
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lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
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len = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24); |
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cmdlen = 16;
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break;
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case 5: |
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lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
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len = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24); |
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cmdlen = 12;
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break;
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default:
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BADF("Unsupported command length, command %x\n", s->command);
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goto fail;
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} |
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#ifdef DEBUG_SCSI
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{ |
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int i;
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for (i = 1; i < cmdlen; i++) { |
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printf(" 0x%02x", buf[i]);
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} |
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printf("\n");
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} |
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#endif
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if (lun || buf[1] >> 5) { |
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/* Only LUN 0 supported. */
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DPRINTF("Unimplemented LUN %d\n", lun ? lun : buf[1] >> 5); |
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goto fail;
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} |
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switch (s->command) {
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case 0x0: |
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DPRINTF("Test Unit Ready\n");
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break;
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case 0x03: |
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DPRINTF("Request Sense (len %d)\n", len);
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if (len < 4) |
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goto fail;
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memset(buf, 0, 4); |
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s->buf[0] = 0xf0; |
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s->buf[1] = 0; |
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s->buf[2] = s->sense;
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s->buf_len = 4;
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break;
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case 0x12: |
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DPRINTF("Inquiry (len %d)\n", len);
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if (len < 36) { |
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BADF("Inquiry buffer too small (%d)\n", len);
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} |
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memset(s->buf, 0, 36); |
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if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
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s->buf[0] = 5; |
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s->buf[1] = 0x80; |
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memcpy(&s->buf[16], "QEMU CD-ROM ", 16); |
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} else {
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s->buf[0] = 0; |
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memcpy(&s->buf[16], "QEMU HARDDISK ", 16); |
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} |
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memcpy(&s->buf[8], "QEMU ", 8); |
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memcpy(&s->buf[32], QEMU_VERSION, 4); |
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/* Identify device as SCSI-3 rev 1.
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Some later commands are also implemented. */
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s->buf[2] = 3; |
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s->buf[3] = 2; /* Format 2 */ |
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s->buf[4] = 32; |
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s->buf_len = 36;
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break;
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case 0x16: |
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DPRINTF("Reserve(6)\n");
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if (buf[1] & 1) |
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goto fail;
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break;
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case 0x17: |
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DPRINTF("Release(6)\n");
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if (buf[1] & 1) |
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goto fail;
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break;
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case 0x1a: |
281 |
case 0x5a: |
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{ |
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char *p;
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int page;
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page = buf[2] & 0x3f; |
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DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
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p = s->buf; |
289 |
memset(p, 0, 4); |
290 |
s->buf[1] = 0; /* Default media type. */ |
291 |
s->buf[3] = 0; /* Block descriptor length. */ |
292 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
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s->buf[2] = 0x80; /* Readonly. */ |
294 |
} |
295 |
p += 4;
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if ((page == 8 || page == 0x3f)) { |
297 |
/* Caching page. */
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p[0] = 8; |
299 |
p[1] = 0x12; |
300 |
p[2] = 4; /* WCE */ |
301 |
p += 19;
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302 |
} |
303 |
if ((page == 0x3f || page == 0x2a) |
304 |
&& (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM)) { |
305 |
/* CD Capabilities and Mechanical Status page. */
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p[0] = 0x2a; |
307 |
p[1] = 0x14; |
308 |
p[2] = 3; // CD-R & CD-RW read |
309 |
p[3] = 0; // Writing not supported |
310 |
p[4] = 0x7f; /* Audio, composite, digital out, |
311 |
mode 2 form 1&2, multi session */
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312 |
p[5] = 0xff; /* CD DA, DA accurate, RW supported, |
313 |
RW corrected, C2 errors, ISRC,
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314 |
UPC, Bar code */
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315 |
p[6] = 0x2d | (bdrv_is_locked(s->bdrv)? 2 : 0); |
316 |
/* Locking supported, jumper present, eject, tray */
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317 |
p[7] = 0; /* no volume & mute control, no |
318 |
changer */
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319 |
p[8] = (50 * 176) >> 8; // 50x read speed |
320 |
p[9] = (50 * 176) & 0xff; |
321 |
p[10] = 0 >> 8; // No volume |
322 |
p[11] = 0 & 0xff; |
323 |
p[12] = 2048 >> 8; // 2M buffer |
324 |
p[13] = 2048 & 0xff; |
325 |
p[14] = (16 * 176) >> 8; // 16x read speed current |
326 |
p[15] = (16 * 176) & 0xff; |
327 |
p[18] = (16 * 176) >> 8; // 16x write speed |
328 |
p[19] = (16 * 176) & 0xff; |
329 |
p[20] = (16 * 176) >> 8; // 16x write speed current |
330 |
p[21] = (16 * 176) & 0xff; |
331 |
p += 21;
|
332 |
} |
333 |
s->buf_len = p - s->buf; |
334 |
s->buf[0] = s->buf_len - 4; |
335 |
if (s->buf_len > len)
|
336 |
s->buf_len = len; |
337 |
} |
338 |
break;
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339 |
case 0x1b: |
340 |
DPRINTF("Start Stop Unit\n");
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341 |
break;
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342 |
case 0x1e: |
343 |
DPRINTF("Prevent Allow Medium Removal (prevent = %d)\n", buf[4] & 3); |
344 |
bdrv_set_locked(s->bdrv, buf[4] & 1); |
345 |
break;
|
346 |
case 0x25: |
347 |
DPRINTF("Read Capacity\n");
|
348 |
/* The normal LEN field for this command is zero. */
|
349 |
memset(s->buf, 0, 8); |
350 |
bdrv_get_geometry(s->bdrv, &nb_sectors); |
351 |
s->buf[0] = (nb_sectors >> 24) & 0xff; |
352 |
s->buf[1] = (nb_sectors >> 16) & 0xff; |
353 |
s->buf[2] = (nb_sectors >> 8) & 0xff; |
354 |
s->buf[3] = nb_sectors & 0xff; |
355 |
s->buf[4] = 0; |
356 |
s->buf[5] = 0; |
357 |
s->buf[6] = s->cluster_size * 2; |
358 |
s->buf[7] = 0; |
359 |
s->buf_len = 8;
|
360 |
break;
|
361 |
case 0x08: |
362 |
case 0x28: |
363 |
DPRINTF("Read (sector %d, count %d)\n", lba, len);
|
364 |
s->sector = lba * s->cluster_size; |
365 |
s->sector_count = len * s->cluster_size; |
366 |
break;
|
367 |
case 0x0a: |
368 |
case 0x2a: |
369 |
DPRINTF("Write (sector %d, count %d)\n", lba, len);
|
370 |
s->sector = lba * s->cluster_size; |
371 |
s->sector_count = len * s->cluster_size; |
372 |
is_write = 1;
|
373 |
break;
|
374 |
case 0x35: |
375 |
DPRINTF("Syncronise cache (sector %d, count %d)\n", lba, len);
|
376 |
bdrv_flush(s->bdrv); |
377 |
break;
|
378 |
case 0x43: |
379 |
{ |
380 |
int start_track, format, msf, toclen;
|
381 |
|
382 |
msf = buf[1] & 2; |
383 |
format = buf[2] & 0xf; |
384 |
start_track = buf[6];
|
385 |
bdrv_get_geometry(s->bdrv, &nb_sectors); |
386 |
DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1); |
387 |
switch(format) {
|
388 |
case 0: |
389 |
toclen = cdrom_read_toc(nb_sectors, s->buf, msf, start_track); |
390 |
break;
|
391 |
case 1: |
392 |
/* multi session : only a single session defined */
|
393 |
toclen = 12;
|
394 |
memset(s->buf, 0, 12); |
395 |
s->buf[1] = 0x0a; |
396 |
s->buf[2] = 0x01; |
397 |
s->buf[3] = 0x01; |
398 |
break;
|
399 |
case 2: |
400 |
toclen = cdrom_read_toc_raw(nb_sectors, s->buf, msf, start_track); |
401 |
break;
|
402 |
default:
|
403 |
goto error_cmd;
|
404 |
} |
405 |
if (toclen > 0) { |
406 |
if (len > toclen)
|
407 |
len = toclen; |
408 |
s->buf_len = len; |
409 |
break;
|
410 |
} |
411 |
error_cmd:
|
412 |
DPRINTF("Read TOC error\n");
|
413 |
goto fail;
|
414 |
} |
415 |
case 0x46: |
416 |
DPRINTF("Get Configuration (rt %d, maxlen %d)\n", buf[1] & 3, len); |
417 |
memset(s->buf, 0, 8); |
418 |
/* ??? This shoud probably return much more information. For now
|
419 |
just return the basic header indicating the CD-ROM profile. */
|
420 |
s->buf[7] = 8; // CD-ROM |
421 |
s->buf_len = 8;
|
422 |
break;
|
423 |
case 0x56: |
424 |
DPRINTF("Reserve(10)\n");
|
425 |
if (buf[1] & 3) |
426 |
goto fail;
|
427 |
break;
|
428 |
case 0x57: |
429 |
DPRINTF("Release(10)\n");
|
430 |
if (buf[1] & 3) |
431 |
goto fail;
|
432 |
break;
|
433 |
case 0xa0: |
434 |
DPRINTF("Report LUNs (len %d)\n", len);
|
435 |
if (len < 16) |
436 |
goto fail;
|
437 |
memset(s->buf, 0, 16); |
438 |
s->buf[3] = 8; |
439 |
s->buf_len = 16;
|
440 |
break;
|
441 |
default:
|
442 |
DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]); |
443 |
fail:
|
444 |
scsi_command_complete(s, SENSE_ILLEGAL_REQUEST); |
445 |
return 0; |
446 |
} |
447 |
if (s->sector_count == 0 && s->buf_len == 0) { |
448 |
scsi_command_complete(s, SENSE_NO_SENSE); |
449 |
} |
450 |
len = s->sector_count * 512 + s->buf_len;
|
451 |
return is_write ? -len : len;
|
452 |
} |
453 |
|
454 |
void scsi_disk_destroy(SCSIDevice *s)
|
455 |
{ |
456 |
bdrv_close(s->bdrv); |
457 |
qemu_free(s); |
458 |
} |
459 |
|
460 |
SCSIDevice *scsi_disk_init(BlockDriverState *bdrv, |
461 |
scsi_completionfn completion, |
462 |
void *opaque)
|
463 |
{ |
464 |
SCSIDevice *s; |
465 |
|
466 |
s = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
|
467 |
s->bdrv = bdrv; |
468 |
s->completion = completion; |
469 |
s->opaque = opaque; |
470 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
471 |
s->cluster_size = 4;
|
472 |
} else {
|
473 |
s->cluster_size = 1;
|
474 |
} |
475 |
|
476 |
return s;
|
477 |
} |
478 |
|