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Move block dma helpers aiocb to store dma state (Avi Kivity)

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Use the dedicated dma aiocb to store intermediate state for dma block
transactions.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6874 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-03-20 18:26:16 +00:00
parent 3fb94d56c6
commit 37b7842c2f
1 changed files with 20 additions and 17 deletions
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37
dma-helpers.c
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@ -39,6 +39,7 @@ void qemu_sglist_destroy(QEMUSGList *qsg)
}
typedef struct {
BlockDriverAIOCB common;
BlockDriverState *bs;
BlockDriverAIOCB *acb;
QEMUSGList *sg;
@ -48,13 +49,13 @@ typedef struct {
target_phys_addr_t sg_cur_byte;
QEMUIOVector iov;
QEMUBH *bh;
} DMABlockState;
} DMAAIOCB;
static void dma_bdrv_cb(void *opaque, int ret);
static void reschedule_dma(void *opaque)
{
DMABlockState *dbs = (DMABlockState *)opaque;
DMAAIOCB *dbs = (DMAAIOCB *)opaque;
qemu_bh_delete(dbs->bh);
dbs->bh = NULL;
@ -63,7 +64,7 @@ static void reschedule_dma(void *opaque)
static void continue_after_map_failure(void *opaque)
{
DMABlockState *dbs = (DMABlockState *)opaque;
DMAAIOCB *dbs = (DMAAIOCB *)opaque;
dbs->bh = qemu_bh_new(reschedule_dma, dbs);
qemu_bh_schedule(dbs->bh);
@ -71,11 +72,12 @@ static void continue_after_map_failure(void *opaque)
static void dma_bdrv_cb(void *opaque, int ret)
{
DMABlockState *dbs = (DMABlockState *)opaque;
DMAAIOCB *dbs = (DMAAIOCB *)opaque;
target_phys_addr_t cur_addr, cur_len;
void *mem;
int i;
dbs->acb = NULL;
dbs->sector_num += dbs->iov.size / 512;
for (i = 0; i < dbs->iov.niov; ++i) {
cpu_physical_memory_unmap(dbs->iov.iov[i].iov_base,
@ -85,10 +87,9 @@ static void dma_bdrv_cb(void *opaque, int ret)
qemu_iovec_reset(&dbs->iov);
if (dbs->sg_cur_index == dbs->sg->nsg || ret < 0) {
dbs->acb->cb(dbs->acb->opaque, ret);
dbs->common.cb(dbs->common.opaque, ret);
qemu_iovec_destroy(&dbs->iov);
qemu_aio_release(dbs->acb);
qemu_free(dbs);
qemu_aio_release(dbs);
return;
}
@ -112,11 +113,11 @@ static void dma_bdrv_cb(void *opaque, int ret)
}
if (dbs->is_write) {
bdrv_aio_writev(dbs->bs, dbs->sector_num, &dbs->iov,
dbs->iov.size / 512, dma_bdrv_cb, dbs);
dbs->acb = bdrv_aio_writev(dbs->bs, dbs->sector_num, &dbs->iov,
dbs->iov.size / 512, dma_bdrv_cb, dbs);
} else {
bdrv_aio_readv(dbs->bs, dbs->sector_num, &dbs->iov,
dbs->iov.size / 512, dma_bdrv_cb, dbs);
dbs->acb = bdrv_aio_readv(dbs->bs, dbs->sector_num, &dbs->iov,
dbs->iov.size / 512, dma_bdrv_cb, dbs);
}
}
@ -125,10 +126,10 @@ static BlockDriverAIOCB *dma_bdrv_io(
BlockDriverCompletionFunc *cb, void *opaque,
int is_write)
{
DMABlockState *dbs = qemu_malloc(sizeof(*dbs));
DMAAIOCB *dbs = qemu_aio_get_pool(&dma_aio_pool, bs, cb, opaque);
dbs->acb = NULL;
dbs->bs = bs;
dbs->acb = qemu_aio_get_pool(&dma_aio_pool, bs, cb, opaque);
dbs->sg = sg;
dbs->sector_num = sector_num;
dbs->sg_cur_index = 0;
@ -137,7 +138,7 @@ static BlockDriverAIOCB *dma_bdrv_io(
dbs->bh = NULL;
qemu_iovec_init(&dbs->iov, sg->nsg);
dma_bdrv_cb(dbs, 0);
return dbs->acb;
return &dbs->common;
}
@ -157,12 +158,14 @@ BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
static void dma_aio_cancel(BlockDriverAIOCB *acb)
{
DMABlockState *dbs = (DMABlockState *)acb->opaque;
DMAAIOCB *dbs = container_of(acb, DMAAIOCB, common);
bdrv_aio_cancel(dbs->acb);
if (dbs->acb) {
bdrv_aio_cancel(dbs->acb);
}
}
void dma_helper_init(void)
{
aio_pool_init(&dma_aio_pool, sizeof(BlockDriverAIOCB), dma_aio_cancel);
aio_pool_init(&dma_aio_pool, sizeof(DMAAIOCB), dma_aio_cancel);
}