radv/gfx10: implement NGG support (VS only)

[mesa.git] / src / amd / vulkan / si_cmd_buffer.c

diff --git a/src/amd/vulkan/si_cmd_buffer.c b/src/amd/vulkan/si_cmd_buffer.c
index b3d12df45755f1b6b9c301fe04ba20840ff732b8..84e9663963bc7a723826c1d03c86555b8c7c6a73 100644 (file)
--- a/src/amd/vulkan/si_cmd_buffer.c
+++ b/src/amd/vulkan/si_cmd_buffer.c
@@ -317,6 +317,17 @@ si_emit_graphics(struct radv_physical_device *physical_device,
        }
 
        if (physical_device->rad_info.chip_class >= GFX10) {
+               /* Break up a pixel wave if it contains deallocs for more than
+                * half the parameter cache.
+                *
+                * To avoid a deadlock where pixel waves aren't launched
+                * because they're waiting for more pixels while the frontend
+                * is stuck waiting for PC space, the maximum allowed value is
+                * the size of the PC minus the largest possible allocation for
+                * a single primitive shader subgroup.
+                */
+               radeon_set_context_reg(cs, R_028C50_PA_SC_NGG_MODE_CNTL,
+                                      S_028C50_MAX_DEALLOCS_IN_WAVE(512));
                radeon_set_context_reg(cs, R_028C58_VGT_VERTEX_REUSE_BLOCK_CNTL, 14);
                radeon_set_context_reg(cs, R_02835C_PA_SC_TILE_STEERING_OVERRIDE,
                                       physical_device->rad_info.pa_sc_tile_steering_override);