radeonsi/gfx10: launch 2 compute waves per CU before going onto the next CU

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Acked-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/gallium/drivers/radeonsi/si_compute.c b/src/gallium/drivers/radeonsi/si_compute.c
index 6c3509b..0989181 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_compute.c
+++ b/src/gallium/drivers/radeonsi/si_compute.c
@@ -810,12 +810,19 @@ static void si_emit_dispatch_packets(struct si_context *sctx,
        struct si_screen *sscreen = sctx->screen;
        struct radeon_cmdbuf *cs = sctx->gfx_cs;
        bool render_cond_bit = sctx->render_cond && !sctx->render_cond_force_off;
+       unsigned threads_per_threadgroup =
+               info->block[0] * info->block[1] * info->block[2];
        unsigned waves_per_threadgroup =
-               DIV_ROUND_UP(info->block[0] * info->block[1] * info->block[2], 64);
+               DIV_ROUND_UP(threads_per_threadgroup, 64);
+       unsigned threadgroups_per_cu = 1;
+
+       if (sctx->chip_class >= GFX10 && waves_per_threadgroup == 1)
+               threadgroups_per_cu = 2;
 
        radeon_set_sh_reg(cs, R_00B854_COMPUTE_RESOURCE_LIMITS,
                          si_get_compute_resource_limits(sscreen, waves_per_threadgroup,
-                                                        sctx->cs_max_waves_per_sh, 1));
+                                                        sctx->cs_max_waves_per_sh,
+                                                        threadgroups_per_cu));
 
        unsigned dispatch_initiator =
                S_00B800_COMPUTE_SHADER_EN(1) |