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cb144ccb2f
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>
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/*
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* DMA helper functions
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*
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* Copyright (c) 2009 Red Hat
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*
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* This work is licensed under the terms of the GNU General Public License
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* (GNU GPL), version 2 or later.
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*/
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#ifndef DMA_H
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#define DMA_H
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#include <stdio.h>
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//#include "cpu.h"
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#include "hw/hw.h"
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#include "block.h"
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typedef struct {
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target_phys_addr_t base;
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target_phys_addr_t len;
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} ScatterGatherEntry;
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typedef struct {
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ScatterGatherEntry *sg;
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int nsg;
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int nalloc;
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target_phys_addr_t size;
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} QEMUSGList;
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void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint);
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void qemu_sglist_add(QEMUSGList *qsg, target_phys_addr_t base,
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target_phys_addr_t len);
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void qemu_sglist_destroy(QEMUSGList *qsg);
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typedef BlockDriverAIOCB *DMAIOFunc(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *dma_bdrv_io(BlockDriverState *bs,
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QEMUSGList *sg, uint64_t sector_num,
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DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
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void *opaque, int is_write);
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BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
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QEMUSGList *sg, uint64_t sector,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
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QEMUSGList *sg, uint64_t sector,
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BlockDriverCompletionFunc *cb, void *opaque);
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#endif
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