Mesa (main): radv: Use I/O lowering for task and mesh shaders.
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Thu May 12 00:59:26 UTC 2022
Module: Mesa
Branch: main
Commit: c17c523ec0ff09f3aa6989bad3473bec6cb52807
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=c17c523ec0ff09f3aa6989bad3473bec6cb52807
Author: Timur Kristóf <timur.kristof at gmail.com>
Date: Tue Feb 8 11:27:24 2022 +0100
radv: Use I/O lowering for task and mesh shaders.
We set the number of task shader ring entries in radv_device
based on the generous assumption that each CU can run task/mesh
shaders with maximum occupancy.
Signed-off-by: Timur Kristóf <timur.kristof at gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02 at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14929>
---
src/amd/vulkan/radv_constants.h | 5 +++++
src/amd/vulkan/radv_device.c | 18 ++++++++++++++++++
src/amd/vulkan/radv_private.h | 3 +++
src/amd/vulkan/radv_shader.c | 9 +++++++++
4 files changed, 35 insertions(+)
diff --git a/src/amd/vulkan/radv_constants.h b/src/amd/vulkan/radv_constants.h
index 4b6d3b9667b..c40330f3bc3 100644
--- a/src/amd/vulkan/radv_constants.h
+++ b/src/amd/vulkan/radv_constants.h
@@ -91,6 +91,11 @@
*/
#define RADV_MAX_MEMORY_ALLOCATION_SIZE 0xFFFFFFFCull
+/* Size of each payload entry in the task payload ring.
+ * Spec requires minimum 16K bytes.
+ */
+#define RADV_TASK_PAYLOAD_ENTRY_BYTES 16384
+
/* Number of invocations in each subgroup. */
#define RADV_SUBGROUP_SIZE 64
diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
index 63de77db804..493748ce7df 100644
--- a/src/amd/vulkan/radv_device.c
+++ b/src/amd/vulkan/radv_device.c
@@ -3331,6 +3331,24 @@ radv_CreateDevice(VkPhysicalDevice physicalDevice, const VkDeviceCreateInfo *pCr
ac_get_hs_info(&device->physical_device->rad_info,
&device->hs);
+ /* Number of task shader ring entries. Needs to be a power of two.
+ * Use a low number on smaller chips so we don't waste space,
+ * but keep it high on bigger chips so it doesn't inhibit parallelism.
+ */
+ switch (device->physical_device->rad_info.family) {
+ case CHIP_VANGOGH:
+ case CHIP_BEIGE_GOBY:
+ case CHIP_YELLOW_CARP:
+ device->task_num_entries = 256;
+ break;
+ case CHIP_SIENNA_CICHLID:
+ case CHIP_NAVY_FLOUNDER:
+ case CHIP_DIMGREY_CAVEFISH:
+ default:
+ device->task_num_entries = 1024;
+ break;
+ }
+
if (device->instance->debug_flags & RADV_DEBUG_HANG) {
/* Enable GPU hangs detection and dump logs if a GPU hang is
* detected.
diff --git a/src/amd/vulkan/radv_private.h b/src/amd/vulkan/radv_private.h
index c1431e55704..aa94c87c307 100644
--- a/src/amd/vulkan/radv_private.h
+++ b/src/amd/vulkan/radv_private.h
@@ -777,6 +777,9 @@ struct radv_device {
uint32_t scratch_waves;
uint32_t dispatch_initiator;
+ /* Number of entries in the task shader ring buffers. */
+ uint32_t task_num_entries;
+
uint32_t gs_table_depth;
struct ac_hs_info hs;
diff --git a/src/amd/vulkan/radv_shader.c b/src/amd/vulkan/radv_shader.c
index 1a3b5d1ef8b..79394421dfe 100644
--- a/src/amd/vulkan/radv_shader.c
+++ b/src/amd/vulkan/radv_shader.c
@@ -1042,6 +1042,15 @@ radv_lower_io_to_mem(struct radv_device *device, struct radv_pipeline_stage *sta
ac_nir_lower_gs_inputs_to_mem(nir, device->physical_device->rad_info.chip_class,
info->gs.num_linked_inputs);
return true;
+ } else if (nir->info.stage == MESA_SHADER_TASK) {
+ ac_nir_apply_first_task_to_task_shader(nir);
+ ac_nir_lower_task_outputs_to_mem(nir, RADV_TASK_PAYLOAD_ENTRY_BYTES,
+ device->task_num_entries);
+ return true;
+ } else if (nir->info.stage == MESA_SHADER_MESH) {
+ ac_nir_lower_mesh_inputs_to_mem(nir, RADV_TASK_PAYLOAD_ENTRY_BYTES,
+ device->task_num_entries);
+ return true;
}
return false;
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