2 files changed, 39 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/nvgpu_mem.c b/drivers/gpu/nvgpu/common/linux/nvgpu_mem.c
index 9b9f58e1..eb51676c 100644
--- a/drivers/gpu/nvgpu/common/linux/nvgpu_mem.c
+++ b/drivers/gpu/nvgpu/common/linux/nvgpu_mem.c
@@ -472,6 +472,25 @@ int __nvgpu_mem_create_from_pages(struct gk20a *g, struct nvgpu_mem *dest,
         return 0;
 }
 
+int __nvgpu_mem_create_from_phys(struct gk20a *g, struct nvgpu_mem *dest,
+                                 u64 src_phys, int nr_pages)
+{
+        struct page **pages =
+                nvgpu_kmalloc(g, sizeof(struct page *) * nr_pages);
+        int i, ret = 0;
+
+        if (!pages)
+                return -ENOMEM;
+
+        for (i = 0; i < nr_pages; i++)
+                pages[i] = phys_to_page(src_phys + PAGE_SIZE * i);
+
+        ret = __nvgpu_mem_create_from_pages(g, dest, pages, nr_pages);
+        nvgpu_kfree(g, pages);
+
+        return ret;
+}
+
 static void *nvgpu_mem_linux_sgl_next(void *sgl)
 {
         return sg_next((struct scatterlist *)sgl);
diff --git a/drivers/gpu/nvgpu/include/nvgpu/linux/nvgpu_mem.h b/drivers/gpu/nvgpu/include/nvgpu/linux/nvgpu_mem.h
index 517d834c..e5f5031a 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/linux/nvgpu_mem.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/linux/nvgpu_mem.h
@@ -66,4 +66,24 @@ struct nvgpu_sgt *nvgpu_linux_sgt_create(struct gk20a *g,
 int __nvgpu_mem_create_from_pages(struct gk20a *g, struct nvgpu_mem *dest,
                                   struct page **pages, int nr_pages);
 
+/**
+ * __nvgpu_mem_create_from_phys - Create an nvgpu_mem from physical mem.
+ *
+ * @g        - The GPU.
+ * @dest     - nvgpu_mem to initialize.
+ * @src_phys - start address of physical mem
+ * @nr_pages - The number of pages in phys.
+ *
+ * Create a new nvgpu_mem struct from a physical memory aperure. The physical
+ * memory aperture needs to be contiguous for requested @nr_pages. This API
+ * only works for SYSMEM.
+ *
+ * The resulting nvgpu_mem should be released with the nvgpu_dma_free() or the
+ * nvgpu_dma_unmap_free() function depending on whether or not the resulting
+ * nvgpu_mem has been mapped.
+ *
+ * Returns 0 on success, or a relevant error otherwise.
+ */
+int __nvgpu_mem_create_from_phys(struct gk20a *g, struct nvgpu_mem *dest,
+                                  u64 src_phys, int nr_pages);
 #endif