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Subject[PATCH 10/16] dma-debug: add add checking for map/unmap_sg
Date
Impact: add debug callbacks for dma_{un}map_sg
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
include/linux/dma-debug.h | 15 ++++++++++++
lib/dma-debug.c | 53 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 68 insertions(+), 0 deletions(-)
diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
index 82ae9ca..b2131f4 100644
--- a/include/linux/dma-debug.h
+++ b/include/linux/dma-debug.h
@@ -34,6 +34,11 @@ extern void debug_map_single(struct device *dev, void *ptr, size_t size,
extern void debug_unmap_single(struct device *dev, dma_addr_t addr,
size_t size, int direction);

+extern void debug_map_sg(struct device *dev, struct scatterlist *sg,
+ int nents, int direction);
+
+extern void debug_unmap_sg(struct device *dev, struct scatterlist *sglist,
+ int nelems, int dir);

#else /* CONFIG_DMA_API_DEBUG */

@@ -52,6 +57,16 @@ static inline void debug_unmap_single(struct device *dev, dma_addr_t addr,
{
}

+static inline void debug_map_sg(struct device *dev, struct scatterlist *sg,
+ int nents, int direction)
+{
+}
+
+static inline void debug_unmap_sg(struct device *dev,
+ struct scatterlist *sglist,
+ int nelems, int dir)
+{
+}

#endif /* CONFIG_DMA_API_DEBUG */

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index d4d14e5..e6d45f9 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -17,6 +17,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

+#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/dma-debug.h>
#include <linux/spinlock.h>
@@ -551,3 +552,55 @@ void debug_unmap_single(struct device *dev, dma_addr_t addr,
}
EXPORT_SYMBOL(debug_unmap_single);

+void debug_map_sg(struct device *dev, struct scatterlist *sg,
+ int nents, int direction)
+{
+ struct dma_debug_entry *entry;
+ struct scatterlist *s;
+ int i;
+
+ if (global_disable)
+ return;
+
+ for_each_sg(sg, s, nents, i) {
+ entry = dma_entry_alloc();
+ if (!entry)
+ return;
+
+ entry->type = dma_debug_sg;
+ entry->dev = dev;
+ entry->cpu_addr = sg_virt(s);
+ entry->size = s->length;
+ entry->dev_addr = s->dma_address;
+ entry->direction = direction;
+
+ add_dma_entry(entry);
+ }
+}
+EXPORT_SYMBOL(debug_map_sg);
+
+void debug_unmap_sg(struct device *dev, struct scatterlist *sglist,
+ int nelems, int dir)
+{
+ struct scatterlist *s;
+ int i;
+
+ if (global_disable)
+ return;
+
+ for_each_sg(sglist, s, nelems, i) {
+
+ struct dma_debug_entry ref = {
+ .type = dma_debug_sg,
+ .dev = dev,
+ .cpu_addr = sg_virt(s),
+ .dev_addr = s->dma_address,
+ .size = s->length,
+ .direction = dir,
+ };
+
+ check_unmap(&ref);
+ }
+}
+EXPORT_SYMBOL(debug_unmap_sg);
+
--
1.5.6.4



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