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ARM: DMA: add support for DMA debugging

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Add ARM support for the DMA debug infrastructure, which allows the
DMA API usage to be debugged.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2011-01-03 11:29:28 +00:00
parent 9eedd96301
commit 24056f5250
4 changed files with 83 additions and 23 deletions
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24
arch/arm/mm/dma-mapping.c
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@@ -554,17 +554,20 @@ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
struct scatterlist *s;
int i, j;
BUG_ON(!valid_dma_direction(dir));
for_each_sg(sg, s, nents, i) {
s->dma_address = dma_map_page(dev, sg_page(s), s->offset,
s->dma_address = __dma_map_page(dev, sg_page(s), s->offset,
s->length, dir);
if (dma_mapping_error(dev, s->dma_address))
goto bad_mapping;
}
debug_dma_map_sg(dev, sg, nents, nents, dir);
return nents;
bad_mapping:
for_each_sg(sg, s, i, j)
dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
__dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
return 0;
}
EXPORT_SYMBOL(dma_map_sg);
@@ -585,8 +588,10 @@ void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
struct scatterlist *s;
int i;
debug_dma_unmap_sg(dev, sg, nents, dir);
for_each_sg(sg, s, nents, i)
dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
__dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
}
EXPORT_SYMBOL(dma_unmap_sg);
@@ -611,6 +616,8 @@ void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
__dma_page_dev_to_cpu(sg_page(s), s->offset,
s->length, dir);
}
debug_dma_sync_sg_for_cpu(dev, sg, nents, dir);
}
EXPORT_SYMBOL(dma_sync_sg_for_cpu);
@@ -635,5 +642,16 @@ void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
__dma_page_cpu_to_dev(sg_page(s), s->offset,
s->length, dir);
}
debug_dma_sync_sg_for_device(dev, sg, nents, dir);
}
EXPORT_SYMBOL(dma_sync_sg_for_device);
#define PREALLOC_DMA_DEBUG_ENTRIES 4096
static int __init dma_debug_do_init(void)
{
dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
return 0;
}
fs_initcall(dma_debug_do_init);