dma-debug: add add checking for map/unmap_sg (972aa45c) · Commits · e / devices / android_kernel_fairphone_FP4

include/linux/dma-debug.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@
		#include <linux/types.h>

		struct device;
		struct scatterlist;

		#ifdef CONFIG_DMA_API_DEBUG

		@@ -36,6 +37,11 @@ extern void debug_dma_map_page(struct device dev, struct page page,
		extern void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
		size_t size, int direction, bool map_single);

		extern void debug_dma_map_sg(struct device dev, struct scatterlist sg,
		int nents, int mapped_ents, int direction);

		extern void debug_dma_unmap_sg(struct device dev, struct scatterlist sglist,
		int nelems, int dir);

		#else /* CONFIG_DMA_API_DEBUG */

		@@ -56,6 +62,16 @@ static inline void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
		{
		}

		static inline void debug_dma_map_sg(struct device dev, struct scatterlist sg,
		int nents, int mapped_ents, int direction)
		{
		}

		static inline void debug_dma_unmap_sg(struct device *dev,
		struct scatterlist *sglist,
		int nelems, int dir)
		{
		}

		#endif /* CONFIG_DMA_API_DEBUG */

lib/dma-debug.c

+73 −0

Original line number	Diff line number	Diff line
		@@ -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>
		@@ -619,3 +620,75 @@ void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
		}
		EXPORT_SYMBOL(debug_dma_unmap_page);

		void debug_dma_map_sg(struct device dev, struct scatterlist sg,
		int nents, int mapped_ents, int direction)
		{
		struct dma_debug_entry *entry;
		struct scatterlist *s;
		int i;

		if (unlikely(global_disable))
		return;

		for_each_sg(sg, s, mapped_ents, i) {
		entry = dma_entry_alloc();
		if (!entry)
		return;

		entry->type = dma_debug_sg;
		entry->dev = dev;
		entry->paddr = sg_phys(s);
		entry->size = s->length;
		entry->dev_addr = s->dma_address;
		entry->direction = direction;
		entry->sg_call_ents = nents;
		entry->sg_mapped_ents = mapped_ents;

		check_for_stack(dev, sg_virt(s));

		add_dma_entry(entry);
		}
		}
		EXPORT_SYMBOL(debug_dma_map_sg);

		void debug_dma_unmap_sg(struct device dev, struct scatterlist sglist,
		int nelems, int dir)
		{
		struct dma_debug_entry *entry;
		struct scatterlist *s;
		int mapped_ents = 0, i;
		unsigned long flags;

		if (unlikely(global_disable))
		return;

		for_each_sg(sglist, s, nelems, i) {

		struct dma_debug_entry ref = {
		.type = dma_debug_sg,
		.dev = dev,
		.paddr = sg_phys(s),
		.dev_addr = s->dma_address,
		.size = s->length,
		.direction = dir,
		.sg_call_ents = 0,
		};

		if (mapped_ents && i >= mapped_ents)
		break;

		if (mapped_ents == 0) {
		struct hash_bucket *bucket;
		ref.sg_call_ents = nelems;
		bucket = get_hash_bucket(&ref, &flags);
		entry = hash_bucket_find(bucket, &ref);
		if (entry)
		mapped_ents = entry->sg_mapped_ents;
		put_hash_bucket(bucket, &flags);
		}

		check_unmap(&ref);
		}
		}
		EXPORT_SYMBOL(debug_dma_unmap_sg);