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Re: [Qemu-devel] [STABLE][PATCH 2/4] Move block dma helpers aiocb to sto
From: |
Mark McLoughlin |
Subject: |
Re: [Qemu-devel] [STABLE][PATCH 2/4] Move block dma helpers aiocb to store dma state |
Date: |
Thu, 14 May 2009 12:39:33 +0100 |
On Thu, 2009-05-14 at 11:56 +0100, Mark McLoughlin wrote:
> From: Avi Kivity <address@hidden>
>
> Use the dedicated dma aiocb to store intermediate state for dma block
> transactions.
>
> Signed-off-by: Avi Kivity <address@hidden>
Signed-off-by: Mark McLoughlin <address@hidden>
> ---
> dma-helpers.c | 37 ++++++++++++++++++++-----------------
> 1 files changed, 20 insertions(+), 17 deletions(-)
>
> diff --git a/dma-helpers.c b/dma-helpers.c
> index 19fa4f0..96a120c 100644
> --- a/dma-helpers.c
> +++ b/dma-helpers.c
> @@ -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);
> }
[Qemu-devel] Re: [STABLE][PATCH 0/4] Rebase more aio dma cancellation work, Avi Kivity, 2009/05/14
Re: [Qemu-devel] [STABLE][PATCH 0/4] Rebase more aio dma cancellation work, Anthony Liguori, 2009/05/14