[Mesa-dev] [PATCH v2 25/25] radeonsi: enable ARB_sparse_buffer

[Nicolai Hähnle]

From: Nicolai Hähnle <nicolai.haehnle at amd.com>

TODO add features.txt and ChangeLog

v2:
- fill in DRM version requirement
- disable on SI due to CP DMA faults
---
 src/gallium/drivers/radeonsi/si_pipe.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 277fa28..9096f16 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -461,20 +461,30 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 
 	case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
 	case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
 	case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
 		/* SI doesn't support unaligned loads.
 		 * CIK needs DRM 2.50.0 on radeon. */
 		return sscreen->b.chip_class == SI ||
 		       (sscreen->b.info.drm_major == 2 &&
 			sscreen->b.info.drm_minor < 50);
 
+	case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
+		/* Disable on SI due to VM faults in CP DMA. Enable once these
+		 * faults are mitigated in software.
+		 */
+		if (sscreen->b.chip_class >= CIK &&
+		    sscreen->b.info.drm_major == 3 &&
+		    sscreen->b.info.drm_minor >= 13)
+			return RADEON_SPARSE_PAGE_SIZE;
+		return 0;
+
 	/* Unsupported features. */
 	case PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY:
 	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
 	case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
 	case PIPE_CAP_USER_VERTEX_BUFFERS:
 	case PIPE_CAP_FAKE_SW_MSAA:
 	case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 	case PIPE_CAP_VERTEXID_NOBASE:
 	case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 	case PIPE_CAP_TGSI_VOTE:
-- 
2.9.3