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ide: convert ide_sector_write() to asynchronous I/O 

The IDE PIO write sector code path uses bdrv_write() and hence can make
the guest unresponsive while the I/O request is in progress.  This patch
converts ide_sector_write() to use bdrv_aio_writev() by using the
BUSY_STAT bit to tell the guest that the request is in progress.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Tested-by: Richard Davies <richard@arachsys.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Stefan Hajnoczi 2012-03-29 10:31:31 +01:00 committed by Kevin Wolf
parent bef0fd5958
commit e82dabd82e
1 changed files with 42 additions and 19 deletions
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61
hw/ide/core.c
View File

@ -688,40 +688,39 @@ static void ide_sector_write_timer_cb(void *opaque)
ide_set_irq(s->bus);
}
void ide_sector_write(IDEState *s)
static void ide_sector_write_cb(void *opaque, int ret)
{
int64_t sector_num;
int ret, n, n1;
IDEState *s = opaque;
int n;
s->status = READY_STAT | SEEK_STAT;
sector_num = ide_get_sector(s);
#if defined(DEBUG_IDE)
printf("write sector=%" PRId64 "\n", sector_num);
#endif
n = s->nsector;
if (n > s->req_nb_sectors)
n = s->req_nb_sectors;
bdrv_acct_start(s->bs, &s->acct, n * BDRV_SECTOR_SIZE, BDRV_ACCT_READ);
ret = bdrv_write(s->bs, sector_num, s->io_buffer, n);
bdrv_acct_done(s->bs, &s->acct);
s->pio_aiocb = NULL;
s->status &= ~BUSY_STAT;
if (ret != 0) {
if (ide_handle_rw_error(s, -ret, BM_STATUS_PIO_RETRY))
if (ide_handle_rw_error(s, -ret, BM_STATUS_PIO_RETRY)) {
return;
}
}
n = s->nsector;
if (n > s->req_nb_sectors) {
n = s->req_nb_sectors;
}
s->nsector -= n;
if (s->nsector == 0) {
/* no more sectors to write */
ide_transfer_stop(s);
} else {
n1 = s->nsector;
if (n1 > s->req_nb_sectors)
int n1 = s->nsector;
if (n1 > s->req_nb_sectors) {
n1 = s->req_nb_sectors;
ide_transfer_start(s, s->io_buffer, 512 * n1, ide_sector_write);
}
ide_transfer_start(s, s->io_buffer, n1 * BDRV_SECTOR_SIZE,
ide_sector_write);
}
ide_set_sector(s, sector_num + n);
ide_set_sector(s, ide_get_sector(s) + n);
if (win2k_install_hack && ((++s->irq_count % 16) == 0)) {
/* It seems there is a bug in the Windows 2000 installer HDD
@ -737,6 +736,30 @@ void ide_sector_write(IDEState *s)
}
}
void ide_sector_write(IDEState *s)
{
int64_t sector_num;
int n;
s->status = READY_STAT | SEEK_STAT | BUSY_STAT;
sector_num = ide_get_sector(s);
#if defined(DEBUG_IDE)
printf("sector=%" PRId64 "\n", sector_num);
#endif
n = s->nsector;
if (n > s->req_nb_sectors) {
n = s->req_nb_sectors;
}
s->iov.iov_base = s->io_buffer;
s->iov.iov_len = n * BDRV_SECTOR_SIZE;
qemu_iovec_init_external(&s->qiov, &s->iov, 1);
bdrv_acct_start(s->bs, &s->acct, n * BDRV_SECTOR_SIZE, BDRV_ACCT_READ);
s->pio_aiocb = bdrv_aio_writev(s->bs, sector_num, &s->qiov, n,
ide_sector_write_cb, s);
}
static void ide_flush_cb(void *opaque, int ret)
{
IDEState *s = opaque;