* THE SOFTWARE.
*/
+#include "qemu/osdep.h"
#include "hw/ide/internal.h"
#include "hw/scsi/scsi.h"
#include "sysemu/block-backend.h"
+#define ATAPI_SECTOR_BITS (2 + BDRV_SECTOR_BITS)
+#define ATAPI_SECTOR_SIZE (1 << ATAPI_SECTOR_BITS)
+
static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret);
static void padstr8(uint8_t *buf, int buf_size, const char *src)
memset(buf, 0, 288);
}
-static int cd_read_sector(IDEState *s, int lba, uint8_t *buf, int sector_size)
+static int
+cd_read_sector_sync(IDEState *s)
{
int ret;
+ block_acct_start(blk_get_stats(s->blk), &s->acct,
+ ATAPI_SECTOR_SIZE, BLOCK_ACCT_READ);
+
+#ifdef DEBUG_IDE_ATAPI
+ printf("cd_read_sector_sync: lba=%d\n", s->lba);
+#endif
- switch(sector_size) {
+ switch (s->cd_sector_size) {
case 2048:
- block_acct_start(blk_get_stats(s->blk), &s->acct,
- 4 * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
- ret = blk_read(s->blk, (int64_t)lba << 2, buf, 4);
- block_acct_done(blk_get_stats(s->blk), &s->acct);
+ ret = blk_pread(s->blk, (int64_t)s->lba << ATAPI_SECTOR_BITS,
+ s->io_buffer, ATAPI_SECTOR_SIZE);
break;
case 2352:
- block_acct_start(blk_get_stats(s->blk), &s->acct,
- 4 * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
- ret = blk_read(s->blk, (int64_t)lba << 2, buf + 16, 4);
- block_acct_done(blk_get_stats(s->blk), &s->acct);
- if (ret < 0)
- return ret;
- cd_data_to_raw(buf, lba);
+ ret = blk_pread(s->blk, (int64_t)s->lba << ATAPI_SECTOR_BITS,
+ s->io_buffer + 16, ATAPI_SECTOR_SIZE);
+ if (ret >= 0) {
+ cd_data_to_raw(s->io_buffer, s->lba);
+ }
break;
default:
- ret = -EIO;
- break;
+ block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_READ);
+ return -EIO;
}
+
+ if (ret < 0) {
+ block_acct_failed(blk_get_stats(s->blk), &s->acct);
+ } else {
+ block_acct_done(blk_get_stats(s->blk), &s->acct);
+ s->lba++;
+ s->io_buffer_index = 0;
+ }
+
return ret;
}
+static void cd_read_sector_cb(void *opaque, int ret)
+{
+ IDEState *s = opaque;
+
+#ifdef DEBUG_IDE_ATAPI
+ printf("cd_read_sector_cb: lba=%d ret=%d\n", s->lba, ret);
+#endif
+
+ if (ret < 0) {
+ block_acct_failed(blk_get_stats(s->blk), &s->acct);
+ ide_atapi_io_error(s, ret);
+ return;
+ }
+
+ block_acct_done(blk_get_stats(s->blk), &s->acct);
+
+ if (s->cd_sector_size == 2352) {
+ cd_data_to_raw(s->io_buffer, s->lba);
+ }
+
+ s->lba++;
+ s->io_buffer_index = 0;
+ s->status &= ~BUSY_STAT;
+
+ ide_atapi_cmd_reply_end(s);
+}
+
+static int cd_read_sector(IDEState *s)
+{
+ if (s->cd_sector_size != 2048 && s->cd_sector_size != 2352) {
+ block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_READ);
+ return -EINVAL;
+ }
+
+ s->iov.iov_base = (s->cd_sector_size == 2352) ?
+ s->io_buffer + 16 : s->io_buffer;
+
+ s->iov.iov_len = ATAPI_SECTOR_SIZE;
+ qemu_iovec_init_external(&s->qiov, &s->iov, 1);
+
+#ifdef DEBUG_IDE_ATAPI
+ printf("cd_read_sector: lba=%d\n", s->lba);
+#endif
+
+ block_acct_start(blk_get_stats(s->blk), &s->acct,
+ ATAPI_SECTOR_SIZE, BLOCK_ACCT_READ);
+
+ ide_buffered_readv(s, (int64_t)s->lba << 2, &s->qiov, 4,
+ cd_read_sector_cb, s);
+
+ s->status |= BUSY_STAT;
+ return 0;
+}
+
void ide_atapi_cmd_ok(IDEState *s)
{
s->error = 0;
}
}
+static uint16_t atapi_byte_count_limit(IDEState *s)
+{
+ uint16_t bcl;
+
+ bcl = s->lcyl | (s->hcyl << 8);
+ if (bcl == 0xffff) {
+ return 0xfffe;
+ }
+ return bcl;
+}
+
/* The whole ATAPI transfer logic is handled in this function */
void ide_atapi_cmd_reply_end(IDEState *s)
{
ide_atapi_cmd_ok(s);
ide_set_irq(s->bus);
#ifdef DEBUG_IDE_ATAPI
- printf("status=0x%x\n", s->status);
+ printf("end of transfer, status=0x%x\n", s->status);
#endif
} else {
/* see if a new sector must be read */
if (s->lba != -1 && s->io_buffer_index >= s->cd_sector_size) {
- ret = cd_read_sector(s, s->lba, s->io_buffer, s->cd_sector_size);
- if (ret < 0) {
- ide_atapi_io_error(s, ret);
+ if (!s->elementary_transfer_size) {
+ ret = cd_read_sector(s);
+ if (ret < 0) {
+ ide_atapi_io_error(s, ret);
+ }
return;
+ } else {
+ /* rebuffering within an elementary transfer is
+ * only possible with a sync request because we
+ * end up with a race condition otherwise */
+ ret = cd_read_sector_sync(s);
+ if (ret < 0) {
+ ide_atapi_io_error(s, ret);
+ return;
+ }
}
- s->lba++;
- s->io_buffer_index = 0;
}
if (s->elementary_transfer_size > 0) {
/* there are some data left to transmit in this elementary
} else {
/* a new transfer is needed */
s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO;
- byte_count_limit = s->lcyl | (s->hcyl << 8);
+ byte_count_limit = atapi_byte_count_limit(s);
#ifdef DEBUG_IDE_ATAPI
printf("byte_count_limit=%d\n", byte_count_limit);
#endif
- if (byte_count_limit == 0xffff)
- byte_count_limit--;
size = s->packet_transfer_size;
if (size > byte_count_limit) {
/* byte count limit must be even if this case */
s->io_buffer_index = sector_size;
s->cd_sector_size = sector_size;
- s->status = READY_STAT | SEEK_STAT;
ide_atapi_cmd_reply_end(s);
}
}
/* ATAPI DMA support */
-/* XXX: handle read errors */
static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)
{
IDEState *s = opaque;
int data_offset, n;
if (ret < 0) {
- ide_atapi_io_error(s, ret);
- goto eot;
+ if (ide_handle_rw_error(s, -ret, ide_dma_cmd_to_retry(s->dma_cmd))) {
+ if (s->bus->error_status) {
+ s->bus->dma->aiocb = NULL;
+ return;
+ }
+ goto eot;
+ }
}
if (s->io_buffer_size > 0) {
#endif
s->bus->dma->iov.iov_base = (void *)(s->io_buffer + data_offset);
- s->bus->dma->iov.iov_len = n * 4 * 512;
+ s->bus->dma->iov.iov_len = n * ATAPI_SECTOR_SIZE;
qemu_iovec_init_external(&s->bus->dma->qiov, &s->bus->dma->iov, 1);
- s->bus->dma->aiocb = blk_aio_readv(s->blk, (int64_t)s->lba << 2,
- &s->bus->dma->qiov, n * 4,
- ide_atapi_cmd_read_dma_cb, s);
+ s->bus->dma->aiocb = ide_buffered_readv(s, (int64_t)s->lba << 2,
+ &s->bus->dma->qiov, n * 4,
+ ide_atapi_cmd_read_dma_cb, s);
return;
eot:
- block_acct_done(blk_get_stats(s->blk), &s->acct);
+ if (ret < 0) {
+ block_acct_failed(blk_get_stats(s->blk), &s->acct);
+ } else {
+ block_acct_done(blk_get_stats(s->blk), &s->acct);
+ }
ide_set_inactive(s, false);
}
}
}
-
-/* Called by *_restart_bh when the transfer function points
- * to ide_atapi_cmd
- */
void ide_atapi_dma_restart(IDEState *s)
{
/*
- * I'm not sure we have enough stored to restart the command
- * safely, so give the guest an error it should recover from.
- * I'm assuming most guests will try to recover from something
- * listed as a medium error on a CD; it seems to work on Linux.
- * This would be more of a problem if we did any other type of
- * DMA operation.
+ * At this point we can just re-evaluate the packet command and start over.
+ * The presence of ->dma_cb callback in the pre_save ensures that the packet
+ * command has been completely sent and we can safely restart command.
*/
- ide_atapi_cmd_error(s, MEDIUM_ERROR, ASC_NO_SEEK_COMPLETE);
+ s->unit = s->bus->retry_unit;
+ s->bus->dma->ops->restart_dma(s->bus->dma);
+ ide_atapi_cmd(s);
}
static inline uint8_t ide_atapi_set_profile(uint8_t *buf, uint8_t *index,
return 8; /* We wrote to 4 extra bytes from the header */
}
+/*
+ * Before transferring data or otherwise signalling acceptance of a command
+ * marked CONDDATA, we must check the validity of the byte_count_limit.
+ */
+static bool validate_bcl(IDEState *s)
+{
+ /* TODO: Check IDENTIFY data word 125 for defacult BCL (currently 0) */
+ if (s->atapi_dma || atapi_byte_count_limit(s)) {
+ return true;
+ }
+
+ /* TODO: Move abort back into core.c and introduce proper error flow between
+ * ATAPI layer and IDE core layer */
+ ide_abort_command(s);
+ return false;
+}
+
static void cmd_get_event_status_notification(IDEState *s,
uint8_t *buf)
{
out:
buf[size_idx] = idx - preamble_len;
ide_atapi_cmd_reply(s, idx, max_len);
- return;
}
static void cmd_get_configuration(IDEState *s, uint8_t *buf)
return;
}
- transfer_request = buf[9];
- switch(transfer_request & 0xf8) {
- case 0x00:
+ transfer_request = buf[9] & 0xf8;
+ if (transfer_request == 0x00) {
/* nothing */
ide_atapi_cmd_ok(s);
- break;
+ return;
+ }
+
+ /* Check validity of BCL before transferring data */
+ if (!validate_bcl(s)) {
+ return;
+ }
+
+ switch (transfer_request) {
case 0x10:
/* normal read */
ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
* 4.1.8)
*/
CHECK_READY = 0x02,
+
+ /*
+ * Commands flagged with NONDATA do not in any circumstances return
+ * any data via ide_atapi_cmd_reply. These commands are exempt from
+ * the normal byte_count_limit constraints.
+ * See ATA8-ACS3 "7.21.5 Byte Count Limit"
+ */
+ NONDATA = 0x04,
+
+ /*
+ * CONDDATA implies a command that transfers data only conditionally based
+ * on the presence of suboptions. It should be exempt from the BCL check at
+ * command validation time, but it needs to be checked at the command
+ * handler level instead.
+ */
+ CONDDATA = 0x08,
};
-static const struct {
+static const struct AtapiCmd {
void (*handler)(IDEState *s, uint8_t *buf);
int flags;
} atapi_cmd_table[0x100] = {
- [ 0x00 ] = { cmd_test_unit_ready, CHECK_READY },
+ [ 0x00 ] = { cmd_test_unit_ready, CHECK_READY | NONDATA },
[ 0x03 ] = { cmd_request_sense, ALLOW_UA },
[ 0x12 ] = { cmd_inquiry, ALLOW_UA },
- [ 0x1b ] = { cmd_start_stop_unit, 0 }, /* [1] */
- [ 0x1e ] = { cmd_prevent_allow_medium_removal, 0 },
+ [ 0x1b ] = { cmd_start_stop_unit, NONDATA }, /* [1] */
+ [ 0x1e ] = { cmd_prevent_allow_medium_removal, NONDATA },
[ 0x25 ] = { cmd_read_cdvd_capacity, CHECK_READY },
[ 0x28 ] = { cmd_read, /* (10) */ CHECK_READY },
- [ 0x2b ] = { cmd_seek, CHECK_READY },
+ [ 0x2b ] = { cmd_seek, CHECK_READY | NONDATA },
[ 0x43 ] = { cmd_read_toc_pma_atip, CHECK_READY },
[ 0x46 ] = { cmd_get_configuration, ALLOW_UA },
[ 0x4a ] = { cmd_get_event_status_notification, ALLOW_UA },
[ 0x5a ] = { cmd_mode_sense, /* (10) */ 0 },
[ 0xa8 ] = { cmd_read, /* (12) */ CHECK_READY },
[ 0xad ] = { cmd_read_dvd_structure, CHECK_READY },
- [ 0xbb ] = { cmd_set_speed, 0 },
+ [ 0xbb ] = { cmd_set_speed, NONDATA },
[ 0xbd ] = { cmd_mechanism_status, 0 },
- [ 0xbe ] = { cmd_read_cd, CHECK_READY },
+ [ 0xbe ] = { cmd_read_cd, CHECK_READY | CONDDATA },
/* [1] handler detects and reports not ready condition itself */
};
void ide_atapi_cmd(IDEState *s)
{
- uint8_t *buf;
+ uint8_t *buf = s->io_buffer;
+ const struct AtapiCmd *cmd = &atapi_cmd_table[s->io_buffer[0]];
- buf = s->io_buffer;
#ifdef DEBUG_IDE_ATAPI
{
int i;
printf("\n");
}
#endif
+
/*
* If there's a UNIT_ATTENTION condition pending, only command flagged with
* ALLOW_UA are allowed to complete. with other commands getting a CHECK
* condition response unless a higher priority status, defined by the drive
* here, is pending.
*/
- if (s->sense_key == UNIT_ATTENTION &&
- !(atapi_cmd_table[s->io_buffer[0]].flags & ALLOW_UA)) {
+ if (s->sense_key == UNIT_ATTENTION && !(cmd->flags & ALLOW_UA)) {
ide_atapi_cmd_check_status(s);
return;
}
* GET_EVENT_STATUS_NOTIFICATION to detect such tray open/close
* states rely on this behavior.
*/
- if (!(atapi_cmd_table[s->io_buffer[0]].flags & ALLOW_UA) &&
+ if (!(cmd->flags & ALLOW_UA) &&
!s->tray_open && blk_is_inserted(s->blk) && s->cdrom_changed) {
if (s->cdrom_changed == 1) {
}
/* Report a Not Ready condition if appropriate for the command */
- if ((atapi_cmd_table[s->io_buffer[0]].flags & CHECK_READY) &&
+ if ((cmd->flags & CHECK_READY) &&
(!media_present(s) || !blk_is_inserted(s->blk)))
{
ide_atapi_cmd_error(s, NOT_READY, ASC_MEDIUM_NOT_PRESENT);
return;
}
+ /* Commands that don't transfer DATA permit the byte_count_limit to be 0.
+ * If this is a data-transferring PIO command and BCL is 0,
+ * we abort at the /ATA/ level, not the ATAPI level.
+ * See ATA8 ACS3 section 7.17.6.49 and 7.21.5 */
+ if (cmd->handler && !(cmd->flags & (NONDATA | CONDDATA))) {
+ if (!validate_bcl(s)) {
+ return;
+ }
+ }
+
/* Execute the command */
- if (atapi_cmd_table[s->io_buffer[0]].handler) {
- atapi_cmd_table[s->io_buffer[0]].handler(s, buf);
+ if (cmd->handler) {
+ cmd->handler(s, buf);
return;
}
projects / qemu.git / blobdiff