drm/amdgpu: handle CPU access for split VRAM buffers (v2)

[karo-tx-linux.git] / drivers / gpu / drm / amd / amdgpu / amdgpu_ttm.c

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 83f4930f870c7c5fdf561e42e28f230ec571fb67..e3008d55ec77ce48bae2172ba5192c2d0d16d170 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -529,9 +529,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
        case TTM_PL_TT:
                break;
        case TTM_PL_VRAM:
-               if (mem->start == AMDGPU_BO_INVALID_OFFSET)
-                       return -EINVAL;
-
                mem->bus.offset = mem->start << PAGE_SHIFT;
                /* check if it's visible */
                if ((mem->bus.offset + mem->bus.size) > adev->mc.visible_vram_size)
@@ -549,6 +546,17 @@ static void amdgpu_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_re
 {
 }
 
+static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
+                                          unsigned long page_offset)
+{
+       struct drm_mm_node *mm = bo->mem.mm_node;
+       uint64_t size = mm->size;
+       unsigned long offset = page_offset;
+
+       page_offset = do_div(offset, size);
+       return (bo->mem.bus.base >> PAGE_SHIFT) + mm->start + page_offset;
+}
+
 /*
  * TTM backend functions.
  */
@@ -1064,7 +1072,7 @@ static struct ttm_bo_driver amdgpu_bo_driver = {
        .fault_reserve_notify = &amdgpu_bo_fault_reserve_notify,
        .io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
        .io_mem_free = &amdgpu_ttm_io_mem_free,
-       .io_mem_pfn = ttm_bo_default_io_mem_pfn,
+       .io_mem_pfn = amdgpu_ttm_io_mem_pfn,
 };
 
 int amdgpu_ttm_init(struct amdgpu_device *adev)