drm/amdgpu: implement amdgpu_fill_buffer()

so that bo could be set to some pattern

Signed-off-by: Flora Cui <Flora.Cui@amd.com>
Reviewed-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 389322a..9f71ff7 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -435,6 +435,11 @@ int amdgpu_copy_buffer(struct amdgpu_ring *ring,
                       uint32_t byte_count,
                       struct reservation_object *resv,
                       struct fence **fence);
+int amdgpu_fill_buffer(struct amdgpu_bo *bo,
+                       uint32_t src_data,
+                       struct reservation_object *resv,
+                       struct fence **fence);
+
 int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma);
 
 struct amdgpu_bo_list_entry {

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index b7742e6..5dc9c4c 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1207,6 +1207,68 @@ error_free:
        return r;
 }
 
+int amdgpu_fill_buffer(struct amdgpu_bo *bo,
+               uint32_t src_data,
+               struct reservation_object *resv,
+               struct fence **fence)
+{
+       struct amdgpu_device *adev = bo->adev;
+       struct amdgpu_job *job;
+       struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
+
+       uint32_t max_bytes, byte_count;
+       uint64_t dst_offset;
+       unsigned int num_loops, num_dw;
+       unsigned int i;
+       int r;
+
+       byte_count = bo->tbo.num_pages << PAGE_SHIFT;
+       max_bytes = adev->mman.buffer_funcs->fill_max_bytes;
+       num_loops = DIV_ROUND_UP(byte_count, max_bytes);
+       num_dw = num_loops * adev->mman.buffer_funcs->fill_num_dw;
+
+       /* for IB padding */
+       while (num_dw & 0x7)
+               num_dw++;
+
+       r = amdgpu_job_alloc_with_ib(adev, num_dw * 4, &job);
+       if (r)
+               return r;
+
+       if (resv) {
+               r = amdgpu_sync_resv(adev, &job->sync, resv,
+                               AMDGPU_FENCE_OWNER_UNDEFINED);
+               if (r) {
+                       DRM_ERROR("sync failed (%d).\n", r);
+                       goto error_free;
+               }
+       }
+
+       dst_offset = bo->tbo.mem.start << PAGE_SHIFT;
+       for (i = 0; i < num_loops; i++) {
+               uint32_t cur_size_in_bytes = min(byte_count, max_bytes);
+
+               amdgpu_emit_fill_buffer(adev, &job->ibs[0], src_data,
+                               dst_offset, cur_size_in_bytes);
+
+               dst_offset += cur_size_in_bytes;
+               byte_count -= cur_size_in_bytes;
+       }
+
+       amdgpu_ring_pad_ib(ring, &job->ibs[0]);
+       WARN_ON(job->ibs[0].length_dw > num_dw);
+       r = amdgpu_job_submit(job, ring, &adev->mman.entity,
+                       AMDGPU_FENCE_OWNER_UNDEFINED, fence);
+       if (r)
+               goto error_free;
+
+       return 0;
+
+error_free:
+       amdgpu_job_free(job);
+       return r;
+}
+
 #if defined(CONFIG_DEBUG_FS)
 
 static int amdgpu_mm_dump_table(struct seq_file *m, void *data)