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d32311810f
This patch uses the newly created dma_addr_t type throughout the scatter/gather handling code in dma-helpers.c whenever we need to represent a dma bus address. This makes a better distinction as to what is a bus address and what is a cpu physical address. Since we don't support IOMMUs yet, they can't be very different for now, but that will change in future, and this preliminary helps clarify what's going on. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
62 lines
1.8 KiB
C
62 lines
1.8 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 ScatterGatherEntry ScatterGatherEntry;
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#if defined(TARGET_PHYS_ADDR_BITS)
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typedef target_phys_addr_t dma_addr_t;
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#define DMA_ADDR_FMT TARGET_FMT_plx
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typedef enum {
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DMA_DIRECTION_TO_DEVICE = 0,
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DMA_DIRECTION_FROM_DEVICE = 1,
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} DMADirection;
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struct ScatterGatherEntry {
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dma_addr_t base;
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dma_addr_t len;
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};
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struct QEMUSGList {
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ScatterGatherEntry *sg;
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int nsg;
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int nalloc;
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dma_addr_t size;
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};
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void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint);
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void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len);
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void qemu_sglist_destroy(QEMUSGList *qsg);
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#endif
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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, bool to_dev);
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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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