From: Marek Olšák <marek.ol...@amd.com>
Based on the VGT spec.
The Vulkan driver doesn't do it optimally and they plan to fix it.
---
src/gallium/drivers/radeonsi/si_state_draw.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c
b/src/gallium/drivers/radeonsi/si_state_draw.c
index d3e6e1a..e44147f 100644
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -311,28 +311,29 @@ static unsigned si_get_ia_multi_vgt_param(struct
si_context *sctx,
wd_switch_on_eop = true;
/* Hawaii hangs if instancing is enabled and WD_SWITCH_ON_EOP
is 0.
* We don't know that for indirect drawing, so treat it as
* always problematic. */
if (sctx->b.family == CHIP_HAWAII &&
(info->indirect || info->instance_count > 1))
wd_switch_on_eop = true;
/* Performance recommendation for 4 SE Gfx7-8 parts if
- * instances are smaller than a primgroup. Ignore the fact
- * primgroup_size is a primitive count, not vertex count.
- * Don't do anything for indirect draws.
+ * instances are smaller than a primgroup.
+ * Assume indirect draws always use small instances.
+ * This is needed for good VS wave utilization.
*/
if (sctx->b.chip_class <= VI &&
sctx->b.screen->info.max_se >= 4 &&
- !info->indirect &&
- info->instance_count > 1 && info->count < primgroup_size)
+ (info->indirect ||
+ (info->instance_count > 1 &&
+ si_num_prims_for_vertices(info) < primgroup_size)))
wd_switch_on_eop = true;
/* Required on CIK and later. */
if (sctx->b.screen->info.max_se > 2 && !wd_switch_on_eop)
ia_switch_on_eoi = true;
/* Required by Hawaii and, for some special cases, by VI. */
if (ia_switch_on_eoi &&
(sctx->b.family == CHIP_HAWAII ||
(sctx->b.chip_class == VI &&
--
2.7.4
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