From: Christian König <christian.koe...@amd.com>

This allows us to move scattered buffers around.

v2: fix a couple of typos, handle scattered to scattered moves as well.

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 118 +++++++++++++++++++++++---------
 1 file changed, 85 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index b1f5d73..4b8b39c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -259,64 +259,116 @@ 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 int amdgpu_mm_node_addr(struct ttm_buffer_object *bo,
+                              struct drm_mm_node *mm_node,
+                              struct ttm_mem_reg *mem,
+                              uint64_t *addr)
 {
-       struct amdgpu_device *adev;
-       struct amdgpu_ring *ring;
-       uint64_t old_start, new_start;
-       struct fence *fence;
        int r;
 
-       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_TT:
-               r = amdgpu_ttm_bind(bo, old_mem);
+               r = amdgpu_ttm_bind(bo, mem);
                if (r)
                        return r;
 
        case TTM_PL_VRAM:
-               old_start += bo->bdev->man[old_mem->mem_type].gpu_offset;
+               *addr = mm_node->start << PAGE_SHIFT;
+               *addr += bo->bdev->man[mem->mem_type].gpu_offset;
                break;
        default:
-               DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
+               DRM_ERROR("Unknown placement %d\n", mem->mem_type);
                return -EINVAL;
        }
-       switch (new_mem->mem_type) {
-       case TTM_PL_TT:
-               r = amdgpu_ttm_bind(bo, new_mem);
-               if (r)
-                       return r;
 
-       case TTM_PL_VRAM:
-               new_start += bo->bdev->man[new_mem->mem_type].gpu_offset;
-               break;
-       default:
-               DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
-               return -EINVAL;
-       }
+       return 0;
+}
+
+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, old_size, new_start, new_size;
+       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;
+       r = amdgpu_mm_node_addr(bo, old_mm, old_mem, &old_start);
+       if (r)
+               return r;
+       old_size = old_mm->size;
+
 
-       r = amdgpu_copy_buffer(ring, old_start, new_start,
-                              new_mem->num_pages * PAGE_SIZE, /* bytes */
-                              bo->resv, &fence, false);
+       new_mm = new_mem->mm_node;
+       r = amdgpu_mm_node_addr(bo, new_mm, new_mem, &new_start);
        if (r)
                return r;
+       new_size = new_mm->size;
+
+       num_pages = new_mem->num_pages;
+       while (num_pages) {
+               unsigned long cur_pages = min(old_size, new_size);
+               struct fence *next;
+
+               r = amdgpu_copy_buffer(ring, old_start, new_start,
+                                      cur_pages * PAGE_SIZE,
+                                      bo->resv, &next, false);
+               if (r)
+                       goto error;
+
+               fence_put(fence);
+               fence = next;
+
+               num_pages -= cur_pages;
+               if (!num_pages)
+                       break;
+
+               old_size -= cur_pages;
+               if (!old_size) {
+                       r = amdgpu_mm_node_addr(bo, ++old_mm, old_mem,
+                                               &old_start);
+                       if (r)
+                               goto error;
+                       old_size = old_mm->size;
+               } else {
+                       old_start += cur_pages * PAGE_SIZE;
+               }
+
+               new_size -= cur_pages;
+               if (!new_size) {
+                       r = amdgpu_mm_node_addr(bo, ++new_mm, new_mem,
+                                               &new_start);
+                       if (r)
+                               goto error;
+
+                       new_size = new_mm->size;
+               } else {
+                       new_start += cur_pages * PAGE_SIZE;
+               }
+       }
 
        r = ttm_bo_pipeline_move(bo, fence, evict, new_mem);
        fence_put(fence);
        return r;
+
+error:
+       if (fence)
+               fence_wait(fence, false);
+       fence_put(fence);
+       return r;
 }
 
 static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo,
-- 
2.5.0

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