The SDMA engine has a hardware limitation of 4 MB maximum transfer size per operation. AMDGPU_GTT_MAX_TRANSFER_SIZE was hardcoded to 512 pages, which worked correctly on systems with 4K pages but fails on systems with larger page sizes.
This patch divides the max transfer size / AMDGPU_GPU_PAGES_IN_CPU_PAGE to match with non-4K page size systems. Signed-off-by: Donet Tom <[email protected]> Signed-off-by: Ritesh Harjani (IBM) <[email protected]> --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h index 0be2728aa872..9d038feb25b0 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h @@ -37,7 +37,7 @@ #define AMDGPU_PL_MMIO_REMAP (TTM_PL_PRIV + 5) #define __AMDGPU_PL_NUM (TTM_PL_PRIV + 6) -#define AMDGPU_GTT_MAX_TRANSFER_SIZE 512 +#define AMDGPU_GTT_MAX_TRANSFER_SIZE (512 / AMDGPU_GPU_PAGES_IN_CPU_PAGE) #define AMDGPU_GTT_NUM_TRANSFER_WINDOWS 2 extern const struct attribute_group amdgpu_vram_mgr_attr_group; -- 2.52.0
