From: Marek Olšák <marek.ol...@amd.com>
v2: take the number of CUs into account
v3: change in LS allocation
---
src/gallium/drivers/radeonsi/si_state.c | 26 +++++++++++++++++++++++---
1 file changed, 23 insertions(+), 3 deletions(-)
diff --git a/src/gallium/drivers/radeonsi/si_state.c
b/src/gallium/drivers/radeonsi/si_state.c
index 67b2835..ef709ee 100644
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -3701,12 +3701,32 @@ static void si_init_config(struct si_context *sctx)
si_pm4_set_reg(pm4, R_028408_VGT_INDX_OFFSET, 0);
if (sctx->b.chip_class >= CIK) {
- si_pm4_set_reg(pm4, R_00B51C_SPI_SHADER_PGM_RSRC3_LS,
S_00B51C_CU_EN(0xffff));
si_pm4_set_reg(pm4, R_00B41C_SPI_SHADER_PGM_RSRC3_HS, 0);
si_pm4_set_reg(pm4, R_00B31C_SPI_SHADER_PGM_RSRC3_ES,
S_00B31C_CU_EN(0xffff));
si_pm4_set_reg(pm4, R_00B21C_SPI_SHADER_PGM_RSRC3_GS,
S_00B21C_CU_EN(0xffff));
- si_pm4_set_reg(pm4, R_00B118_SPI_SHADER_PGM_RSRC3_VS,
S_00B118_CU_EN(0xffff));
- si_pm4_set_reg(pm4, R_00B11C_SPI_SHADER_LATE_ALLOC_VS,
S_00B11C_LIMIT(0));
+
+ if (sscreen->b.info.num_good_compute_units /
+ (sscreen->b.info.max_se * sscreen->b.info.max_sh_per_se) <=
4) {
+ /* Too few available compute units per SH. Disallowing
+ * VS to run on CU0 could hurt us more than late VS
+ * allocation would help.
+ *
+ * LATE_ALLOC_VS = 2 is the highest safe number.
+ */
+ si_pm4_set_reg(pm4, R_00B51C_SPI_SHADER_PGM_RSRC3_LS,
S_00B51C_CU_EN(0xffff));
+ si_pm4_set_reg(pm4, R_00B118_SPI_SHADER_PGM_RSRC3_VS,
S_00B118_CU_EN(0xffff));
+ si_pm4_set_reg(pm4, R_00B11C_SPI_SHADER_LATE_ALLOC_VS,
S_00B11C_LIMIT(2));
+ } else {
+ /* Set LATE_ALLOC_VS == 31. It should be less than
+ * the number of scratch waves. Limitations:
+ * - VS can't execute on CU0.
+ * - If HS writes outputs to LDS, LS can't execute on
CU0.
+ */
+ si_pm4_set_reg(pm4, R_00B51C_SPI_SHADER_PGM_RSRC3_LS,
S_00B51C_CU_EN(0xfffe));
+ si_pm4_set_reg(pm4, R_00B118_SPI_SHADER_PGM_RSRC3_VS,
S_00B118_CU_EN(0xfffe));
+ si_pm4_set_reg(pm4, R_00B11C_SPI_SHADER_LATE_ALLOC_VS,
S_00B11C_LIMIT(31));
+ }
+
si_pm4_set_reg(pm4, R_00B01C_SPI_SHADER_PGM_RSRC3_PS,
S_00B01C_CU_EN(0xffff));
}
--
2.1.4
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