[PATCH 4/5] drm/amdgpu: enable amdgpu_move_blit to handle multiple MM nodes

[deathsimple@xxxxxxxxxxx (Christian König)]

From: Christian König <christian.koenig@xxxxxxx>

This allows us to move scattered buffers around.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 96 ++++++++++++++++++++++-----------
 1 file changed, 64 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index ea480bb..db8638b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -239,52 +239,84 @@ static void amdgpu_move_null(struct ttm_buffer_object *bo,
 	new_mem->mm_node = NULL;
 }
 
-static int amdgpu_move_blit(struct ttm_buffer_object *bo,
-			bool evict, bool no_wait_gpu,
-			struct ttm_mem_reg *new_mem,
-			struct ttm_mem_reg *old_mem)
+static uint64_t amdgpu_mm_node_addr(struct amdgpu_device *adev,
+				    struct drm_mm_node *mm_node,
+				    struct ttm_mem_reg *mem)
 {
-	struct amdgpu_device *adev;
-	struct amdgpu_ring *ring;
-	uint64_t old_start, new_start;
-	struct fence *fence;
-	int r;
+	uint64_t addr = mm_node->start << PAGE_SHIFT;
 
-	adev = amdgpu_get_adev(bo->bdev);
-	ring = adev->mman.buffer_funcs_ring;
-	old_start = (u64)old_mem->start << PAGE_SHIFT;
-	new_start = (u64)new_mem->start << PAGE_SHIFT;
-
-	switch (old_mem->mem_type) {
+	switch (mem->mem_type) {
 	case TTM_PL_VRAM:
 	case TTM_PL_TT:
-		old_start += bo->bdev->man[old_mem->mem_type].gpu_offset;
+		addr += adev->mman.bdev.man[mem->mem_type].gpu_offset;
 		break;
 	default:
-		DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
-		return -EINVAL;
-	}
-	switch (new_mem->mem_type) {
-	case TTM_PL_VRAM:
-	case TTM_PL_TT:
-		new_start += bo->bdev->man[new_mem->mem_type].gpu_offset;
+		DRM_ERROR("Unknown placement %d\n", mem->mem_type);
 		break;
-	default:
-		DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
-		return -EINVAL;
 	}
+
+	return addr;
+}
+
+static int amdgpu_move_blit(struct ttm_buffer_object *bo,
+			    bool evict, bool no_wait_gpu,
+			    struct ttm_mem_reg *new_mem,
+			    struct ttm_mem_reg *old_mem)
+{
+	struct amdgpu_device *adev = amdgpu_get_adev(bo->bdev);
+	struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
+
+	struct drm_mm_node *old_mm, *new_mm;
+	uint64_t old_start, new_start;
+	unsigned long num_pages;
+	struct fence *fence = NULL;
+	int r;
+
+	BUILD_BUG_ON((PAGE_SIZE % AMDGPU_GPU_PAGE_SIZE) != 0);
+
 	if (!ring->ready) {
 		DRM_ERROR("Trying to move memory with ring turned off.\n");
 		return -EINVAL;
 	}
 
-	BUILD_BUG_ON((PAGE_SIZE % AMDGPU_GPU_PAGE_SIZE) != 0);
+	old_mm = old_mem->mm_node;
+	new_mm = new_mem->mm_node;
+	num_pages = new_mem->num_pages;
 
-	r = amdgpu_copy_buffer(ring, old_start, new_start,
-			       new_mem->num_pages * PAGE_SIZE, /* bytes */
-			       bo->resv, &fence, false);
-	if (r)
-		return r;
+	old_start = amdgpu_mm_node_addr(adev, old_mm, old_mem);
+	new_start = amdgpu_mm_node_addr(adev, new_mm, new_mem);
+
+	while (num_pages) {
+		unsigned long cur_pages = min(old_mm->size, new_mm->size);
+		struct fence *next;
+
+		r = amdgpu_copy_buffer(ring, old_start, new_start,
+				       cur_pages * PAGE_SIZE,
+				       bo->resv, &next, false);
+		if (r) {
+			if (fence)
+				fence_wait(fence, false);
+			fence_put(fence);
+			return r;
+		}
+		fence_put(fence);
+		fence = next;
+
+		num_pages -= cur_pages;
+		if (num_pages) {
+			old_start += cur_pages * PAGE_SIZE;
+			if (old_start == ((old_mm->start + old_mm->size) *
+				PAGE_SIZE))
+				old_start = amdgpu_mm_node_addr(adev, ++old_mm,
+								old_mem);
+
+			new_start += cur_pages * PAGE_SIZE;
+			if (new_start == ((new_mm->start + new_mm->size) *
+					  PAGE_SIZE))
+				new_start = amdgpu_mm_node_addr(adev, ++new_mm,
+								new_mem);
+		}
+	}
 
 	r = ttm_bo_pipeline_move(bo, fence, evict, new_mem);
 	fence_put(fence);
-- 
2.5.0