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swiotlb: sg chaining support 

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-05-11 14:56:18 +02:00
parent 38d375561f
commit dbfd49fe9d
1 changed files with 12 additions and 7 deletions
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19
lib/swiotlb.c
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@ -677,16 +677,17 @@ swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
* same here.
*/
int
swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
int dir)
{
struct scatterlist *sg;
void *addr;
dma_addr_t dev_addr;
int i;
BUG_ON(dir == DMA_NONE);
for (i = 0; i < nelems; i++, sg++) {
for_each_sg(sgl, sg, nelems, i) {
addr = SG_ENT_VIRT_ADDRESS(sg);
dev_addr = virt_to_bus(addr);
if (swiotlb_force || address_needs_mapping(hwdev, dev_addr)) {
@ -696,7 +697,7 @@ swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
to do proper error handling. */
swiotlb_full(hwdev, sg->length, dir, 0);
swiotlb_unmap_sg(hwdev, sg - i, i, dir);
sg[0].dma_length = 0;
sgl[0].dma_length = 0;
return 0;
}
sg->dma_address = virt_to_bus(map);
@ -712,19 +713,21 @@ swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
* concerning calls here are the same as for swiotlb_unmap_single() above.
*/
void
swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
int dir)
{
struct scatterlist *sg;
int i;
BUG_ON(dir == DMA_NONE);
for (i = 0; i < nelems; i++, sg++)
for_each_sg(sgl, sg, nelems, i) {
if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
unmap_single(hwdev, bus_to_virt(sg->dma_address),
sg->dma_length, dir);
else if (dir == DMA_FROM_DEVICE)
dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
}
}
/*
@ -735,19 +738,21 @@ swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
* and usage.
*/
static void
swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sg,
swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
int nelems, int dir, int target)
{
struct scatterlist *sg;
int i;
BUG_ON(dir == DMA_NONE);
for (i = 0; i < nelems; i++, sg++)
for_each_sg(sgl, sg, nelems, i) {
if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
sync_single(hwdev, bus_to_virt(sg->dma_address),
sg->dma_length, dir, target);
else if (dir == DMA_FROM_DEVICE)
dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
}
}
void