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radeonsi: set COMPUTE_RESOURCE_LIMITS.FORCE_SIMD_DIST when profitable

Browse source 
ported from Vulkan

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák 2017-11-23 20:22:25 +01:00
parent 043d14db30
commit 1cb731012c
1 changed files with 16 additions and 1 deletions
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17
src/gallium/drivers/radeonsi/si_compute.c
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@ -714,13 +714,28 @@ static void si_setup_tgsi_grid(struct si_context *sctx,
static void si_emit_dispatch_packets(struct si_context *sctx,
const struct pipe_grid_info *info)
{
struct si_screen *sscreen = sctx->screen;
struct radeon_winsys_cs *cs = sctx->b.gfx.cs;
bool render_cond_bit = sctx->b.render_cond && !sctx->b.render_cond_force_off;
unsigned waves_per_threadgroup =
DIV_ROUND_UP(info->block[0] * info->block[1] * info->block[2], 64);
unsigned compute_resource_limits =
S_00B854_SIMD_DEST_CNTL(waves_per_threadgroup % 4 == 0);
if (sctx->b.chip_class >= CIK) {
unsigned num_cu_per_se = sscreen->b.info.num_good_compute_units /
sscreen->b.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);
}
radeon_set_sh_reg(cs, R_00B854_COMPUTE_RESOURCE_LIMITS,
S_00B854_SIMD_DEST_CNTL(waves_per_threadgroup % 4 == 0));
compute_resource_limits);
radeon_set_sh_reg_seq(cs, R_00B81C_COMPUTE_NUM_THREAD_X, 3);
radeon_emit(cs, S_00B81C_NUM_THREAD_FULL(info->block[0]));