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[PATCH] swiotlb: support syncing sub-ranges of mappings

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This patch implements swiotlb_sync_single_range_for_{cpu,device}. This
is intended to support an x86_64 implementation of
dma_sync_single_range_for_{cpu,device}.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
John W. Linville 2005-09-29 14:44:23 -07:00 committed by Tony Luck
parent 8270f3f1a6
commit 878a97cfd7
2 changed files with 41 additions and 0 deletions
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8
include/asm-x86_64/swiotlb.h
View File

@ -15,6 +15,14 @@ extern void swiotlb_sync_single_for_cpu(struct device *hwdev,
extern void swiotlb_sync_single_for_device(struct device *hwdev,
dma_addr_t dev_addr,
size_t size, int dir);
extern void swiotlb_sync_single_range_for_cpu(struct device *hwdev,
dma_addr_t dev_addr,
unsigned long offset,
size_t size, int dir);
extern void swiotlb_sync_single_range_for_device(struct device *hwdev,
dma_addr_t dev_addr,
unsigned long offset,
size_t size, int dir);
extern void swiotlb_sync_sg_for_cpu(struct device *hwdev,
struct scatterlist *sg, int nelems,
int dir);

33
lib/swiotlb.c
View File

@ -622,6 +622,37 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
swiotlb_sync_single(hwdev, dev_addr, size, dir);
}
/*
* Same as above, but for a sub-range of the mapping.
*/
static inline void
swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
unsigned long offset, size_t size, int dir)
{
char *dma_addr = phys_to_virt(dev_addr) + offset;
if (dir == DMA_NONE)
BUG();
if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
sync_single(hwdev, dma_addr, size, dir);
else if (dir == DMA_FROM_DEVICE)
mark_clean(dma_addr, size);
}
void
swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
unsigned long offset, size_t size, int dir)
{
swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir);
}
void
swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
unsigned long offset, size_t size, int dir)
{
swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir);
}
/*
* Map a set of buffers described by scatterlist in streaming mode for DMA.
* This is the scatter-gather version of the above swiotlb_map_single
@ -750,6 +781,8 @@ EXPORT_SYMBOL(swiotlb_map_sg);
EXPORT_SYMBOL(swiotlb_unmap_sg);
EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
EXPORT_SYMBOL(swiotlb_sync_single_for_device);
EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
EXPORT_SYMBOL(swiotlb_dma_mapping_error);