Revision 37b7842c dma-helpers.c
| b/dma-helpers.c | ||
|---|---|---|
| 39 | 39 |
} |
| 40 | 40 |
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| 41 | 41 |
typedef struct {
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| 42 |
BlockDriverAIOCB common; |
|
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BlockDriverState *bs; |
| 43 | 44 |
BlockDriverAIOCB *acb; |
| 44 | 45 |
QEMUSGList *sg; |
| ... | ... | |
| 48 | 49 |
target_phys_addr_t sg_cur_byte; |
| 49 | 50 |
QEMUIOVector iov; |
| 50 | 51 |
QEMUBH *bh; |
| 51 |
} DMABlockState;
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} DMAAIOCB;
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| 52 | 53 |
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| 53 | 54 |
static void dma_bdrv_cb(void *opaque, int ret); |
| 54 | 55 |
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| 55 | 56 |
static void reschedule_dma(void *opaque) |
| 56 | 57 |
{
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DMABlockState *dbs = (DMABlockState *)opaque;
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DMAAIOCB *dbs = (DMAAIOCB *)opaque;
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| 58 | 59 |
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qemu_bh_delete(dbs->bh); |
| 60 | 61 |
dbs->bh = NULL; |
| ... | ... | |
| 63 | 64 |
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| 64 | 65 |
static void continue_after_map_failure(void *opaque) |
| 65 | 66 |
{
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DMABlockState *dbs = (DMABlockState *)opaque;
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DMAAIOCB *dbs = (DMAAIOCB *)opaque;
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| 67 | 68 |
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dbs->bh = qemu_bh_new(reschedule_dma, dbs); |
| 69 | 70 |
qemu_bh_schedule(dbs->bh); |
| ... | ... | |
| 71 | 72 |
|
| 72 | 73 |
static void dma_bdrv_cb(void *opaque, int ret) |
| 73 | 74 |
{
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DMABlockState *dbs = (DMABlockState *)opaque;
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DMAAIOCB *dbs = (DMAAIOCB *)opaque;
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target_phys_addr_t cur_addr, cur_len; |
| 76 | 77 |
void *mem; |
| 77 | 78 |
int i; |
| 78 | 79 |
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dbs->acb = NULL; |
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dbs->sector_num += dbs->iov.size / 512; |
| 80 | 82 |
for (i = 0; i < dbs->iov.niov; ++i) {
|
| 81 | 83 |
cpu_physical_memory_unmap(dbs->iov.iov[i].iov_base, |
| ... | ... | |
| 85 | 87 |
qemu_iovec_reset(&dbs->iov); |
| 86 | 88 |
|
| 87 | 89 |
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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dbs->common.cb(dbs->common.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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qemu_aio_release(dbs); |
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return; |
| 93 | 94 |
} |
| 94 | 95 |
|
| ... | ... | |
| 112 | 113 |
} |
| 113 | 114 |
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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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dbs->acb = 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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| 117 | 118 |
} 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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dbs->acb = 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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| 120 | 121 |
} |
| 121 | 122 |
} |
| 122 | 123 |
|
| ... | ... | |
| 125 | 126 |
BlockDriverCompletionFunc *cb, void *opaque, |
| 126 | 127 |
int is_write) |
| 127 | 128 |
{
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DMABlockState *dbs = qemu_malloc(sizeof(*dbs));
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DMAAIOCB *dbs = qemu_aio_get_pool(&dma_aio_pool, bs, cb, opaque);
|
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dbs->acb = NULL; |
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dbs->bs = bs; |
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dbs->acb = qemu_aio_get_pool(&dma_aio_pool, bs, cb, opaque); |
|
| 132 | 133 |
dbs->sg = sg; |
| 133 | 134 |
dbs->sector_num = sector_num; |
| 134 | 135 |
dbs->sg_cur_index = 0; |
| ... | ... | |
| 137 | 138 |
dbs->bh = NULL; |
| 138 | 139 |
qemu_iovec_init(&dbs->iov, sg->nsg); |
| 139 | 140 |
dma_bdrv_cb(dbs, 0); |
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return dbs->acb;
|
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return &dbs->common;
|
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| 141 | 142 |
} |
| 142 | 143 |
|
| 143 | 144 |
|
| ... | ... | |
| 157 | 158 |
|
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static void dma_aio_cancel(BlockDriverAIOCB *acb) |
| 159 | 160 |
{
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DMABlockState *dbs = (DMABlockState *)acb->opaque;
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DMAAIOCB *dbs = container_of(acb, DMAAIOCB, common);
|
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| 161 | 162 |
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bdrv_aio_cancel(dbs->acb); |
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if (dbs->acb) {
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bdrv_aio_cancel(dbs->acb); |
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} |
|
| 163 | 166 |
} |
| 164 | 167 |
|
| 165 | 168 |
void dma_helper_init(void) |
| 166 | 169 |
{
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aio_pool_init(&dma_aio_pool, sizeof(BlockDriverAIOCB), dma_aio_cancel);
|
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aio_pool_init(&dma_aio_pool, sizeof(DMAAIOCB), dma_aio_cancel);
|
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| 168 | 171 |
} |
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