radv: add an option for disabling NGG on GFX10

Will be useful for testing the legacy path.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_debug.h

@@ -52,6 +52,7 @@ enum {
 	RADV_DEBUG_NOTHREADLLVM      = 0x400000,
 	RADV_DEBUG_NOBINNING         = 0x800000,
 	RADV_DEBUG_NO_LOAD_STORE_OPT = 0x1000000,
+	RADV_DEBUG_NO_NGG            = 0x2000000,
 };
 
 enum {

src/amd/vulkan/radv_device.c

@@ -476,6 +476,7 @@ static const struct debug_control radv_debug_options[] = {
 	{"nothreadllvm", RADV_DEBUG_NOTHREADLLVM},
 	{"nobinning", RADV_DEBUG_NOBINNING},
 	{"noloadstoreopt", RADV_DEBUG_NO_LOAD_STORE_OPT},
+	{"nongg", RADV_DEBUG_NO_NGG},
 	{NULL, 0}
 };
 

src/amd/vulkan/radv_pipeline.c

@@ -173,6 +173,8 @@ static uint32_t get_hash_flags(struct radv_device *device)
 
 	if (device->instance->debug_flags & RADV_DEBUG_UNSAFE_MATH)
 		hash_flags |= RADV_HASH_SHADER_UNSAFE_MATH;
+	if (device->instance->debug_flags & RADV_DEBUG_NO_NGG)
+		hash_flags |= RADV_HASH_SHADER_NO_NGG;
 	if (device->instance->perftest_flags & RADV_PERFTEST_SISCHED)
 		hash_flags |= RADV_HASH_SHADER_SISCHED;
 	return hash_flags;
@@ -2300,7 +2302,8 @@ radv_fill_shader_keys(struct radv_device *device,
 			keys[MESA_SHADER_VERTEX].vs_common_out.as_es = true;
 	}
 
-	if (device->physical_device->rad_info.chip_class >= GFX10) {
+	if (device->physical_device->rad_info.chip_class >= GFX10 &&
+	    !(device->instance->debug_flags & RADV_DEBUG_NO_NGG)) {
 		if (nir[MESA_SHADER_TESS_CTRL]) {
 			keys[MESA_SHADER_TESS_EVAL].vs_common_out.as_ngg = true;
 		} else {

src/amd/vulkan/radv_private.h

@@ -1391,6 +1391,8 @@ struct radv_shader_module;
 #define RADV_HASH_SHADER_IS_GEOM_COPY_SHADER (1 << 0)
 #define RADV_HASH_SHADER_SISCHED             (1 << 1)
 #define RADV_HASH_SHADER_UNSAFE_MATH         (1 << 2)
+#define RADV_HASH_SHADER_NO_NGG              (1 << 3)
+
 void
 radv_hash_shaders(unsigned char *hash,
 		  const VkPipelineShaderStageCreateInfo **stages,