dma.h 1.99 KB
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/*
 * DMA helper functions
 *
 * Copyright (c) 2009 Red Hat
 *
 * This work is licensed under the terms of the GNU General Public License
 * (GNU GPL), version 2 or later.
 */

#ifndef DMA_H
#define DMA_H

#include <stdio.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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typedef enum {
    DMA_DIRECTION_TO_DEVICE = 0,
    DMA_DIRECTION_FROM_DEVICE = 1,
} DMADirection;

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struct QEMUSGList {
    ScatterGatherEntry *sg;
    int nsg;
    int nalloc;
    size_t size;
};

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#if defined(TARGET_PHYS_ADDR_BITS)
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typedef target_phys_addr_t dma_addr_t;

#define DMA_ADDR_FMT TARGET_FMT_plx

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struct ScatterGatherEntry {
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    dma_addr_t base;
    dma_addr_t len;
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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,
                                 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,
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                              void *opaque, DMADirection dir);
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BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
                                QEMUSGList *sg, uint64_t sector,
                                BlockDriverCompletionFunc *cb, void *opaque);
BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
                                 QEMUSGList *sg, uint64_t sector,
                                 BlockDriverCompletionFunc *cb, void *opaque);
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uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg);
uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg);

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void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
                    QEMUSGList *sg, enum BlockAcctType type);

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#endif