radv: Use string for nir dumping.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Allows us to easily dump all nir shaders for combined variants in
vega and simplifies ownership.

src/amd/vulkan/radv_debug.c

@@ -503,9 +503,8 @@ radv_dump_shader(struct radv_pipeline *pipeline,
 		radv_print_spirv(shader->spirv, shader->spirv_size, f);
 	}
 
-	if (shader->nir) {
-		fprintf(f, "NIR:\n");
-		nir_print_shader(shader->nir, f);
+	if (shader->nir_string) {
+		fprintf(f, "NIR:\n%s\n", shader->nir_string);
 	}
 
 	fprintf(f, "LLVM IR:\n%s\n", shader->llvm_ir_string);

src/amd/vulkan/radv_pipeline.c

@@ -2660,7 +2660,6 @@ void radv_create_shaders(struct radv_pipeline *pipeline,
 	for (int i = 0; i < MESA_SHADER_STAGES; ++i) {
 		free(binaries[i]);
 		if (nir[i]) {
-			if (!pipeline->device->keep_shader_info)
 			ralloc_free(nir[i]);
 
 			if (radv_can_dump_shader_stats(device, modules[i]))

src/amd/vulkan/radv_shader.c

@@ -1097,6 +1097,29 @@ radv_shader_variant_create(struct radv_device *device,
 	return variant;
 }
 
+static char *
+radv_dump_nir_shaders(struct nir_shader * const *shaders,
+                      int shader_count)
+{
+	char *data = NULL;
+	char *ret = NULL;
+	size_t size = 0;
+	FILE *f = open_memstream(&data, &size);
+	if (f) {
+		for (int i = 0; i < shader_count; ++i)
+			nir_print_shader(shaders[i], f);
+		fclose(f);
+	}
+
+	ret = malloc(size + 1);
+	if (ret) {
+		memcpy(ret, data, size);
+		ret[size] = 0;
+	}
+	free(data);
+	return ret;
+}
+
 static struct radv_shader_variant *
 shader_variant_compile(struct radv_device *device,
 		       struct radv_shader_module *module,
@@ -1176,8 +1199,8 @@ shader_variant_compile(struct radv_device *device,
 
 
 	if (device->keep_shader_info) {
+		variant->nir_string = radv_dump_nir_shaders(shaders, shader_count);
 		if (!gs_copy_shader && !module->nir) {
-			variant->nir = *shaders;
 			variant->spirv = (uint32_t *)module->data;
 			variant->spirv_size = module->size;
 		}
@@ -1239,7 +1262,7 @@ radv_shader_variant_destroy(struct radv_device *device,
 	list_del(&variant->slab_list);
 	mtx_unlock(&device->shader_slab_mutex);
 
-	ralloc_free(variant->nir);
+	free(variant->nir_string);
 	free(variant->disasm_string);
 	free(variant->llvm_ir_string);
 	free(variant);

src/amd/vulkan/radv_shader.h

@@ -354,7 +354,7 @@ struct radv_shader_variant {
 	/* debug only */
 	uint32_t *spirv;
 	uint32_t spirv_size;
-	struct nir_shader *nir;
+	char *nir_string;
 	char *disasm_string;
 	char *llvm_ir_string;