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make dma_bdrv_io available to drivers 

Make dma_bdrv_io available for drivers, and pass an explicit I/O function
instead of hardcoding bdrv_aio_readv/bdrv_aio_writev.  This is required
to implement non-READ/WRITE dma commands in the ide driver, e.g. the
upcoming TRIM support.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2011-05-19 10:57:59 +02:00 committed by Kevin Wolf
parent 0754f9ecef
commit cb144ccb2f
2 changed files with 18 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
dma-helpers.c
View File

@ -47,6 +47,7 @@ typedef struct {
target_phys_addr_t sg_cur_byte; target_phys_addr_t sg_cur_byte;
QEMUIOVector iov; QEMUIOVector iov;
QEMUBH *bh; QEMUBH *bh;
DMAIOFunc *io_func;
} DMAAIOCB; } DMAAIOCB;
static void dma_bdrv_cb(void *opaque, int ret); static void dma_bdrv_cb(void *opaque, int ret);
@ -116,13 +117,8 @@ static void dma_bdrv_cb(void *opaque, int ret)
return; return;
} }
if (dbs->is_write) { dbs->acb = dbs->io_func(dbs->bs, dbs->sector_num, &dbs->iov,
dbs->acb = bdrv_aio_writev(dbs->bs, dbs->sector_num, &dbs->iov, dbs->iov.size / 512, dma_bdrv_cb, dbs);
dbs->iov.size / 512, dma_bdrv_cb, dbs);
} else {
dbs->acb = bdrv_aio_readv(dbs->bs, dbs->sector_num, &dbs->iov,
dbs->iov.size / 512, dma_bdrv_cb, dbs);
}
if (!dbs->acb) { if (!dbs->acb) {
dma_bdrv_unmap(dbs); dma_bdrv_unmap(dbs);
qemu_iovec_destroy(&dbs->iov); qemu_iovec_destroy(&dbs->iov);
@ -144,12 +140,12 @@ static AIOPool dma_aio_pool = {
.cancel = dma_aio_cancel, .cancel = dma_aio_cancel,
}; };
static BlockDriverAIOCB *dma_bdrv_io( BlockDriverAIOCB *dma_bdrv_io(
BlockDriverState *bs, QEMUSGList *sg, uint64_t sector_num, BlockDriverState *bs, QEMUSGList *sg, uint64_t sector_num,
BlockDriverCompletionFunc *cb, void *opaque, DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
int is_write) void *opaque, int is_write)
{ {
DMAAIOCB *dbs = qemu_aio_get(&dma_aio_pool, bs, cb, opaque); DMAAIOCB *dbs = qemu_aio_get(&dma_aio_pool, bs, cb, opaque);
dbs->acb = NULL; dbs->acb = NULL;
dbs->bs = bs; dbs->bs = bs;
@ -158,6 +154,7 @@ static BlockDriverAIOCB *dma_bdrv_io(
dbs->sg_cur_index = 0; dbs->sg_cur_index = 0;
dbs->sg_cur_byte = 0; dbs->sg_cur_byte = 0;
dbs->is_write = is_write; dbs->is_write = is_write;
dbs->io_func = io_func;
dbs->bh = NULL; dbs->bh = NULL;
qemu_iovec_init(&dbs->iov, sg->nsg); qemu_iovec_init(&dbs->iov, sg->nsg);
dma_bdrv_cb(dbs, 0); dma_bdrv_cb(dbs, 0);
@ -173,12 +170,12 @@ BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
QEMUSGList *sg, uint64_t sector, QEMUSGList *sg, uint64_t sector,
void (*cb)(void *opaque, int ret), void *opaque) void (*cb)(void *opaque, int ret), void *opaque)
{ {
return dma_bdrv_io(bs, sg, sector, cb, opaque, 0); return dma_bdrv_io(bs, sg, sector, bdrv_aio_readv, cb, opaque, 0);
} }
BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs, BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
QEMUSGList *sg, uint64_t sector, QEMUSGList *sg, uint64_t sector,
void (*cb)(void *opaque, int ret), void *opaque) void (*cb)(void *opaque, int ret), void *opaque)
{ {
return dma_bdrv_io(bs, sg, sector, cb, opaque, 1); return dma_bdrv_io(bs, sg, sector, bdrv_aio_writev, cb, opaque, 1);
} }

8
dma.h
View File

@ -32,6 +32,14 @@ void qemu_sglist_add(QEMUSGList *qsg, target_phys_addr_t base,
target_phys_addr_t len); target_phys_addr_t len);
void qemu_sglist_destroy(QEMUSGList *qsg); void qemu_sglist_destroy(QEMUSGList *qsg);
typedef BlockDriverAIOCB *DMAIOFunc(BlockDriverState *bs, int64_t sector_num,
QEMUIOVector *iov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque);
BlockDriverAIOCB *dma_bdrv_io(BlockDriverState *bs,
QEMUSGList *sg, uint64_t sector_num,
DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
void *opaque, int is_write);
BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs, BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
QEMUSGList *sg, uint64_t sector, QEMUSGList *sg, uint64_t sector,
BlockDriverCompletionFunc *cb, void *opaque); BlockDriverCompletionFunc *cb, void *opaque);