Revision 59a703eb dma-helpers.c
b/dma-helpers.c | ||
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*/ |
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#include "dma.h" |
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#include "block_int.h" |
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void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint) |
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{ |
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qemu_free(qsg->sg); |
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} |
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typedef struct { |
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BlockDriverState *bs; |
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BlockDriverAIOCB *acb; |
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QEMUSGList *sg; |
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uint64_t sector_num; |
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int is_write; |
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int sg_cur_index; |
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target_phys_addr_t sg_cur_byte; |
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QEMUIOVector iov; |
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QEMUBH *bh; |
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} DMABlockState; |
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static void dma_bdrv_cb(void *opaque, int ret); |
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static void reschedule_dma(void *opaque) |
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{ |
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DMABlockState *dbs = (DMABlockState *)opaque; |
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qemu_bh_delete(dbs->bh); |
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dbs->bh = NULL; |
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dma_bdrv_cb(opaque, 0); |
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} |
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static void continue_after_map_failure(void *opaque) |
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{ |
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DMABlockState *dbs = (DMABlockState *)opaque; |
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dbs->bh = qemu_bh_new(reschedule_dma, dbs); |
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qemu_bh_schedule(dbs->bh); |
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} |
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static void dma_bdrv_cb(void *opaque, int ret) |
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{ |
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DMABlockState *dbs = (DMABlockState *)opaque; |
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target_phys_addr_t cur_addr, cur_len; |
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void *mem; |
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int i; |
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dbs->sector_num += dbs->iov.size / 512; |
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for (i = 0; i < dbs->iov.niov; ++i) { |
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cpu_physical_memory_unmap(dbs->iov.iov[i].iov_base, |
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dbs->iov.iov[i].iov_len, !dbs->is_write, |
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dbs->iov.iov[i].iov_len); |
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} |
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qemu_iovec_reset(&dbs->iov); |
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if (dbs->sg_cur_index == dbs->sg->nsg || ret < 0) { |
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dbs->acb->cb(dbs->acb->opaque, ret); |
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qemu_iovec_destroy(&dbs->iov); |
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qemu_aio_release(dbs->acb); |
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qemu_free(dbs); |
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return; |
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} |
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while (dbs->sg_cur_index < dbs->sg->nsg) { |
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cur_addr = dbs->sg->sg[dbs->sg_cur_index].base + dbs->sg_cur_byte; |
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cur_len = dbs->sg->sg[dbs->sg_cur_index].len - dbs->sg_cur_byte; |
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mem = cpu_physical_memory_map(cur_addr, &cur_len, !dbs->is_write); |
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if (!mem) |
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break; |
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qemu_iovec_add(&dbs->iov, mem, cur_len); |
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dbs->sg_cur_byte += cur_len; |
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if (dbs->sg_cur_byte == dbs->sg->sg[dbs->sg_cur_index].len) { |
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dbs->sg_cur_byte = 0; |
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++dbs->sg_cur_index; |
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} |
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} |
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if (dbs->iov.size == 0) { |
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cpu_register_map_client(dbs, continue_after_map_failure); |
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return; |
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} |
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if (dbs->is_write) { |
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bdrv_aio_writev(dbs->bs, dbs->sector_num, &dbs->iov, |
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dbs->iov.size / 512, dma_bdrv_cb, dbs); |
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} else { |
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bdrv_aio_readv(dbs->bs, dbs->sector_num, &dbs->iov, |
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dbs->iov.size / 512, dma_bdrv_cb, dbs); |
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} |
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} |
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static BlockDriverAIOCB *dma_bdrv_io( |
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BlockDriverState *bs, QEMUSGList *sg, uint64_t sector_num, |
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BlockDriverCompletionFunc *cb, void *opaque, |
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int is_write) |
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{ |
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DMABlockState *dbs = qemu_malloc(sizeof(*dbs)); |
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dbs->bs = bs; |
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dbs->acb = qemu_aio_get(bs, cb, opaque); |
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dbs->sg = sg; |
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dbs->sector_num = sector_num; |
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dbs->sg_cur_index = 0; |
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dbs->sg_cur_byte = 0; |
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dbs->is_write = is_write; |
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dbs->bh = NULL; |
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qemu_iovec_init(&dbs->iov, sg->nsg); |
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dma_bdrv_cb(dbs, 0); |
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return dbs->acb; |
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} |
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BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs, |
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QEMUSGList *sg, uint64_t sector, |
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void (*cb)(void *opaque, int ret), void *opaque) |
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{ |
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return dma_bdrv_io(bs, sg, sector, cb, opaque, 0); |
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} |
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BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs, |
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QEMUSGList *sg, uint64_t sector, |
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void (*cb)(void *opaque, int ret), void *opaque) |
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{ |
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return dma_bdrv_io(bs, sg, sector, cb, opaque, 1); |
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} |
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