dma-debug: add support for resource mappings

A MMIO mapped resource can not be represented by a struct page so a new
debug type is needed to handle this. This patch add such type and
functionality to add/remove entries and how to translate them to a
physical address.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
index fe8cb610deac..c7d844f09c3a 100644
--- a/include/linux/dma-debug.h
+++ b/include/linux/dma-debug.h
@@ -56,6 +56,13 @@ extern void debug_dma_alloc_coherent(struct device *dev, size_t size,
 extern void debug_dma_free_coherent(struct device *dev, size_t size,
                                     void *virt, dma_addr_t addr);
 
+extern void debug_dma_map_resource(struct device *dev, phys_addr_t addr,
+                                   size_t size, int direction,
+                                   dma_addr_t dma_addr);
+
+extern void debug_dma_unmap_resource(struct device *dev, dma_addr_t dma_addr,
+                                     size_t size, int direction);
+
 extern void debug_dma_sync_single_for_cpu(struct device *dev,
                                           dma_addr_t dma_handle, size_t size,
                                           int direction);
@@ -141,6 +148,18 @@ static inline void debug_dma_free_coherent(struct device *dev, size_t size,
 {
 }
 
+static inline void debug_dma_map_resource(struct device *dev, phys_addr_t addr,
+                                          size_t size, int direction,
+                                          dma_addr_t dma_addr)
+{
+}
+
+static inline void debug_dma_unmap_resource(struct device *dev,
+                                            dma_addr_t dma_addr, size_t size,
+                                            int direction)
+{
+}
+
 static inline void debug_dma_sync_single_for_cpu(struct device *dev,
                                                  dma_addr_t dma_handle,
                                                  size_t size, int direction)