-unsigned si_get_compute_resource_limits(struct si_screen *sscreen,
- unsigned waves_per_threadgroup,
- unsigned max_waves_per_sh,
- unsigned threadgroups_per_cu)
-{
- unsigned compute_resource_limits =
- S_00B854_SIMD_DEST_CNTL(waves_per_threadgroup % 4 == 0);
-
- if (sscreen->info.chip_class >= GFX7) {
- unsigned num_cu_per_se = sscreen->info.num_good_compute_units /
- sscreen->info.max_se;
-
- /* Force even distribution on all SIMDs in CU if the workgroup
- * size is 64. This has shown some good improvements if # of CUs
- * per SE is not a multiple of 4.
- */
- if (num_cu_per_se % 4 && waves_per_threadgroup == 1)
- compute_resource_limits |= S_00B854_FORCE_SIMD_DIST(1);
-
- assert(threadgroups_per_cu >= 1 && threadgroups_per_cu <= 8);
- compute_resource_limits |= S_00B854_WAVES_PER_SH(max_waves_per_sh) |
- S_00B854_CU_GROUP_COUNT(threadgroups_per_cu - 1);
- } else {
- /* GFX6 */
- if (max_waves_per_sh) {
- unsigned limit_div16 = DIV_ROUND_UP(max_waves_per_sh, 16);
- compute_resource_limits |= S_00B854_WAVES_PER_SH_SI(limit_div16);
- }
- }
- return compute_resource_limits;
-}
-