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1 | /* | |
2 | * DMA helper functions | |
3 | * | |
4 | * Copyright (c) 2009 Red Hat | |
5 | * | |
6 | * This work is licensed under the terms of the GNU General Public License | |
7 | * (GNU GPL), version 2 or later. | |
8 | */ | |
9 | ||
10 | #ifndef DMA_H | |
11 | #define DMA_H | |
12 | ||
13 | #include <stdio.h> | |
14 | #include "hw/hw.h" | |
15 | #include "block.h" | |
16 | ||
17 | typedef struct ScatterGatherEntry ScatterGatherEntry; | |
18 | ||
19 | typedef enum { | |
20 | DMA_DIRECTION_TO_DEVICE = 0, | |
21 | DMA_DIRECTION_FROM_DEVICE = 1, | |
22 | } DMADirection; | |
23 | ||
24 | struct QEMUSGList { | |
25 | ScatterGatherEntry *sg; | |
26 | int nsg; | |
27 | int nalloc; | |
28 | size_t size; | |
29 | }; | |
30 | ||
31 | #if defined(TARGET_PHYS_ADDR_BITS) | |
32 | typedef target_phys_addr_t dma_addr_t; | |
33 | ||
34 | #define DMA_ADDR_FMT TARGET_FMT_plx | |
35 | ||
36 | struct ScatterGatherEntry { | |
37 | dma_addr_t base; | |
38 | dma_addr_t len; | |
39 | }; | |
40 | ||
41 | void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint); | |
42 | void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len); | |
43 | void qemu_sglist_destroy(QEMUSGList *qsg); | |
44 | #endif | |
45 | ||
46 | typedef BlockDriverAIOCB *DMAIOFunc(BlockDriverState *bs, int64_t sector_num, | |
47 | QEMUIOVector *iov, int nb_sectors, | |
48 | BlockDriverCompletionFunc *cb, void *opaque); | |
49 | ||
50 | BlockDriverAIOCB *dma_bdrv_io(BlockDriverState *bs, | |
51 | QEMUSGList *sg, uint64_t sector_num, | |
52 | DMAIOFunc *io_func, BlockDriverCompletionFunc *cb, | |
53 | void *opaque, DMADirection dir); | |
54 | BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs, | |
55 | QEMUSGList *sg, uint64_t sector, | |
56 | BlockDriverCompletionFunc *cb, void *opaque); | |
57 | BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs, | |
58 | QEMUSGList *sg, uint64_t sector, | |
59 | BlockDriverCompletionFunc *cb, void *opaque); | |
60 | uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg); | |
61 | uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg); | |
62 | ||
63 | void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, | |
64 | QEMUSGList *sg, enum BlockAcctType type); | |
65 | ||
66 | #endif |