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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 ea6a283..61f559d 100644
    --- a/include/linux/dma-debug.h
    +++ b/include/linux/dma-debug.h
    @@ -36,6 +36,11 @@ 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 direction);
    +
    +extern void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
    + int nelems, int dir);

    #else /* CONFIG_DMA_API_DEBUG */

    @@ -56,6 +61,16 @@ 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 direction)
    +{
    +}
    +
    +static inline void debug_dma_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 9219c41..f3e0145 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>
    @@ -576,3 +577,55 @@ 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 direction)
    +{
    + struct dma_debug_entry *entry;
    + struct scatterlist *s;
    + int i;
    +
    + if (unlikely(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->paddr = sg_phys(s);
    + entry->size = s->length;
    + entry->dev_addr = s->dma_address;
    + entry->direction = direction;
    +
    + 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 scatterlist *s;
    + int i;
    +
    + 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,
    + };
    +
    + check_unmap(&ref);
    + }
    +}
    +EXPORT_SYMBOL(debug_dma_unmap_sg);
    +
    --
    1.5.6.4



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