ARM: DMA: add support for DMA debugging
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>
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 44e7210..85f9361 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -554,17 +554,20 @@
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 @@
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 @@
__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 @@
__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);