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scsi-disk: allow MODE SELECT block descriptor to set the block size

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The MODE SELECT command can contain an optional block descriptor that can be used
to set the device block size. If the block descriptor is present then update the
block size on the SCSI device accordingly.

This allows CDROMs to be used with A/UX which requires a CDROM drive which is
capable of switching from a 2048 byte sector size to a 512 byte sector size.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20220622105314.802852-13-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Mark Cave-Ayland 2022-06-22 11:53:12 +01:00 committed by Paolo Bonzini
parent 4536fba00a
commit 356c4c441e
2 changed files with 7 additions and 0 deletions
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6
hw/scsi/scsi-disk.c
View file

@ -1616,6 +1616,12 @@ static void scsi_disk_emulate_mode_select(SCSIDiskReq *r, uint8_t *inbuf)
goto invalid_param;
}
/* Allow changing the block size */
if (bd_len && p[6] != (s->qdev.blocksize >> 8)) {
s->qdev.blocksize = p[6] << 8;
trace_scsi_disk_mode_select_set_blocksize(s->qdev.blocksize);
}
len -= bd_len;
p += bd_len;

1
hw/scsi/trace-events
View file

@ -340,6 +340,7 @@ scsi_disk_dma_command_WRITE(const char *cmd, uint64_t lba, int len) "Write %s(se
scsi_disk_new_request(uint32_t lun, uint32_t tag, const char *line) "Command: lun=%d tag=0x%x data=%s"
scsi_disk_aio_sgio_command(uint32_t tag, uint8_t cmd, uint64_t lba, int len, uint32_t timeout) "disk aio sgio: tag=0x%x cmd=0x%x (sector %" PRId64 ", count %d) timeout=%u"
scsi_disk_mode_select_page_truncated(int page, int len, int page_len) "page %d expected length %d but received length %d"
scsi_disk_mode_select_set_blocksize(int blocksize) "set block size to %d"
# scsi-generic.c
scsi_generic_command_complete_noio(void *req, uint32_t tag, int statuc) "Command complete %p tag=0x%x status=%d"