anv: Add support for SPIR-V 1.3 subgroup operations

This requires us to bump the subgroup size to 32 for all shader stages
because Vulkan requires that to be a physical device query.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

src/intel/compiler/brw_compiler.h

@@ -113,6 +113,14 @@ struct brw_compiler {
    bool supports_pull_constants;
 };
 
+/**
+ * We use a constant subgroup size of 32.  It really only needs to be a
+ * maximum and, since we do SIMD32 for compute shaders in some cases, it
+ * needs to be at least 32.  SIMD8 and SIMD16 shaders will still claim a
+ * subgroup size of 32 but will act as if 16 or 24 of those channels are
+ * disabled.
+ */
+#define BRW_SUBGROUP_SIZE 32
 
 /**
  * Program key structures.

src/intel/compiler/brw_nir.c

@@ -650,8 +650,7 @@ brw_preprocess_nir(const struct brw_compiler *compiler, nir_shader *nir)
    OPT(nir_lower_system_values);
 
    const nir_lower_subgroups_options subgroups_options = {
-      .subgroup_size = nir->info.stage == MESA_SHADER_COMPUTE ? 32 :
-                       nir->info.stage == MESA_SHADER_FRAGMENT ? 16 : 8,
+      .subgroup_size = BRW_SUBGROUP_SIZE,
       .ballot_bit_size = 32,
       .lower_to_scalar = true,
       .lower_subgroup_masks = true,

src/intel/vulkan/anv_device.c

@@ -1042,6 +1042,30 @@ void anv_GetPhysicalDeviceProperties2(
          break;
       }
 
+      case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBGROUP_PROPERTIES: {
+         VkPhysicalDeviceSubgroupProperties *properties = (void *)ext;
+
+         properties->subgroupSize = BRW_SUBGROUP_SIZE;
+
+         VkShaderStageFlags scalar_stages = 0;
+         for (unsigned stage = 0; stage < MESA_SHADER_STAGES; stage++) {
+            if (pdevice->compiler->scalar_stage[stage])
+               scalar_stages |= mesa_to_vk_shader_stage(stage);
+         }
+         properties->supportedStages = scalar_stages;
+
+         properties->supportedOperations = VK_SUBGROUP_FEATURE_BASIC_BIT |
+                                           VK_SUBGROUP_FEATURE_VOTE_BIT |
+                                           VK_SUBGROUP_FEATURE_ARITHMETIC_BIT |
+                                           VK_SUBGROUP_FEATURE_BALLOT_BIT |
+                                           VK_SUBGROUP_FEATURE_SHUFFLE_BIT |
+                                           VK_SUBGROUP_FEATURE_SHUFFLE_RELATIVE_BIT |
+                                           VK_SUBGROUP_FEATURE_CLUSTERED_BIT |
+                                           VK_SUBGROUP_FEATURE_QUAD_BIT;
+         properties->quadOperationsInAllStages = VK_TRUE;
+         break;
+      }
+
       default:
          anv_debug_ignored_stype(ext->sType);
          break;

src/intel/vulkan/anv_pipeline.c

@@ -144,6 +144,12 @@ anv_shader_compile_to_nir(struct anv_pipeline *pipeline,
          .multiview = true,
          .variable_pointers = true,
          .storage_16bit = device->instance->physicalDevice.info.gen >= 8,
+         .subgroup_arithmetic = true,
+         .subgroup_basic = true,
+         .subgroup_ballot = true,
+         .subgroup_quad = true,
+         .subgroup_shuffle = true,
+         .subgroup_vote = true,
       },
    };