radeonsi: enable KHR_shader_subgroup

Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30610>

docs/features.txt

@@ -335,6 +335,7 @@ Khronos, ARB, and OES extensions that are not part of any OpenGL or OpenGL ES ve
   GL_EXT_texture_norm16                                 DONE (freedreno, r600, radeonsi, nvc0i, softpipe, zink, iris, crocus)
   GL_EXT_texture_sRGB_R8                                DONE (all drivers that support GLES 3.0+)
   GL_KHR_blend_equation_advanced_coherent               DONE (freedreno/a6xx, panfrost, zink, asahi, iris/gen9+)
+  GL_KHR_shader_subgroup                                DONE (radeonsi)
   GL_KHR_texture_compression_astc_hdr                   DONE (core only)
   GL_KHR_texture_compression_astc_sliced_3d             DONE (freedreno/a4xx+, r600, radeonsi, panfrost, softpipe, v3d, zink, lima, asahi, iris/gen9+)
   GL_OES_depth_texture_cube_map                         DONE (all drivers that support GLSL 1.30+)

docs/relnotes/new_features.txt

@@ -3,3 +3,4 @@ VK_EXT_descriptor_buffer on nvk
 VK_EXT_post_depth_coverage on nvk
 VK_KHR_video_maintenance1 on radv
 VK_EXT_legacy_vertex_attributes on nvk
+GL_KHR_shader_subgroup on radeonsi

src/gallium/drivers/radeonsi/si_get.c

@@ -414,6 +414,15 @@ static int si_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
       /* Conversion to nanos from cycles per millisecond */
       return DIV_ROUND_UP(1000000, sscreen->info.clock_crystal_freq);
 
+   case PIPE_CAP_SHADER_SUBGROUP_SIZE:
+      return 64;
+   case PIPE_CAP_SHADER_SUBGROUP_SUPPORTED_STAGES:
+      return BITFIELD_MASK(PIPE_SHADER_TYPES);
+   case PIPE_CAP_SHADER_SUBGROUP_SUPPORTED_FEATURES:
+      return BITFIELD_MASK(PIPE_SHADER_SUBGROUP_NUM_FEATURES);
+   case PIPE_CAP_SHADER_SUBGROUP_QUAD_ALL_STAGES:
+      return true;
+
    default:
       return u_pipe_screen_get_param_defaults(pscreen, param);
    }