drm/amdgpu: add vram usage into debugfs

Signed-off-by: Chunming Zhou <[e-mail]>
Reviewed-by: Jammy Zhou <[e-mail]>
Reviewed-by: Christian König <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

···
 	spin_lock(&glob->lru_lock);
 	ret = drm_mm_dump_table(m, mm);
 	spin_unlock(&glob->lru_lock);
+	if (ttm_pl == TTM_PL_VRAM)
+		seq_printf(m, "man size:%llu pages, ram usage:%luMB, vis usage:%luMB\n",
+			   adev->mman.bdev.man[ttm_pl].size,
+			   atomic64_read(&adev->vram_usage) >> 20,
+			   atomic64_read(&adev->vram_vis_usage) >> 20);
 	return ret;
 }