[Mesa-dev] [PATCH 6/6] radv: implement fast HTILE clears for depth or stencil only on GFX9
Bas Nieuwenhuizen
bas at basnieuwenhuizen.nl
Mon Nov 12 20:33:30 UTC 2018
On Mon, Nov 12, 2018 at 5:55 PM Samuel Pitoiset
<samuel.pitoiset at gmail.com> wrote:
>
> This allows to fast clear the depth part (or the stencil part)
> of a depth+stencil surface when HTILE is enabled. I didn't test
> on GFX8, so it's disabled currently.
>
> This gives a very nice boost, for example when clearing the depth
> aspect of a 4096x4096 D32_SFLOAT_S8_UINT image (18x faster).
>
> BEFORE: 235 us
> AFTER: 13 us
>
> Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
> ---
> src/amd/vulkan/radv_meta_clear.c | 268 ++++++++++++++++++++++++++++++-
> src/amd/vulkan/radv_private.h | 6 +
> 2 files changed, 269 insertions(+), 5 deletions(-)
>
> diff --git a/src/amd/vulkan/radv_meta_clear.c b/src/amd/vulkan/radv_meta_clear.c
> index b3128d021d..364a38daba 100644
> --- a/src/amd/vulkan/radv_meta_clear.c
> +++ b/src/amd/vulkan/radv_meta_clear.c
> @@ -303,6 +303,22 @@ create_color_pipeline(struct radv_device *device,
> return result;
> }
>
> +static void
> +finish_meta_clear_htile_mask_state(struct radv_device *device)
> +{
> + struct radv_meta_state *state = &device->meta_state;
> +
> + radv_DestroyPipeline(radv_device_to_handle(device),
> + state->clear_htile_mask_pipeline,
> + &state->alloc);
> + radv_DestroyPipelineLayout(radv_device_to_handle(device),
> + state->clear_htile_mask_p_layout,
> + &state->alloc);
> + radv_DestroyDescriptorSetLayout(radv_device_to_handle(device),
> + state->clear_htile_mask_ds_layout,
> + &state->alloc);
> +}
> +
> void
> radv_device_finish_meta_clear_state(struct radv_device *device)
> {
> @@ -339,6 +355,8 @@ radv_device_finish_meta_clear_state(struct radv_device *device)
> radv_DestroyPipelineLayout(radv_device_to_handle(device),
> state->clear_depth_p_layout,
> &state->alloc);
> +
> + finish_meta_clear_htile_mask_state(device);
> }
>
> static void
> @@ -746,6 +764,69 @@ emit_depthstencil_clear(struct radv_cmd_buffer *cmd_buffer,
> }
> }
>
> +static uint32_t
> +clear_htile_mask(struct radv_cmd_buffer *cmd_buffer,
> + struct radeon_winsys_bo *bo, uint64_t offset, uint64_t size,
> + uint32_t htile_value, uint32_t htile_mask)
> +{
> + struct radv_device *device = cmd_buffer->device;
> + struct radv_meta_state *state = &device->meta_state;
> + uint64_t block_count = round_up_u64(size, 1024);
> + struct radv_meta_saved_state saved_state;
> +
> + radv_meta_save(&saved_state, cmd_buffer,
> + RADV_META_SAVE_COMPUTE_PIPELINE |
> + RADV_META_SAVE_CONSTANTS |
> + RADV_META_SAVE_DESCRIPTORS);
> +
> + struct radv_buffer dst_buffer = {
> + .bo = bo,
> + .offset = offset,
> + .size = size
> + };
> +
> + radv_CmdBindPipeline(radv_cmd_buffer_to_handle(cmd_buffer),
> + VK_PIPELINE_BIND_POINT_COMPUTE,
> + state->clear_htile_mask_pipeline);
> +
> + radv_meta_push_descriptor_set(cmd_buffer, VK_PIPELINE_BIND_POINT_COMPUTE,
> + state->clear_htile_mask_p_layout,
> + 0, /* set */
> + 1, /* descriptorWriteCount */
> + (VkWriteDescriptorSet[]) {
> + {
> + .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
> + .dstBinding = 0,
> + .dstArrayElement = 0,
> + .descriptorCount = 1,
> + .descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_BUFFER,
> + .pBufferInfo = &(VkDescriptorBufferInfo) {
> + .buffer = radv_buffer_to_handle(&dst_buffer),
> + .offset = 0,
> + .range = size
> + }
> + }
> + });
> +
> + const unsigned constants[2] = {
> + htile_value & htile_mask,
> + ~htile_mask,
> + };
> +
> + radv_CmdPushConstants(radv_cmd_buffer_to_handle(cmd_buffer),
> + state->clear_htile_mask_p_layout,
> + VK_SHADER_STAGE_COMPUTE_BIT, 0, 8,
> + constants);
> +
> + radv_CmdDispatch(radv_cmd_buffer_to_handle(cmd_buffer), block_count, 1, 1);
> +
> + radv_meta_restore(&saved_state, cmd_buffer);
> +
> + return RADV_CMD_FLAG_CS_PARTIAL_FLUSH |
> + RADV_CMD_FLAG_INV_VMEM_L1 |
> + RADV_CMD_FLAG_WRITEBACK_GLOBAL_L2;
> +}
> +
> static uint32_t
> radv_get_htile_fast_clear_value(const struct radv_image *image,
> VkClearDepthStencilValue value)
> @@ -761,6 +842,24 @@ radv_get_htile_fast_clear_value(const struct radv_image *image,
> return clear_value;
> }
>
> +static uint32_t
> +radv_get_htile_mask(const struct radv_image *image, VkImageAspectFlags aspects)
> +{
> + uint32_t mask = 0;
> +
> + if (!image->surface.has_stencil) {
> + /* All the HTILE buffer is used when there is no stencil. */
> + mask = UINT32_MAX;
> + } else {
> + if (aspects & VK_IMAGE_ASPECT_DEPTH_BIT)
> + mask |= 0xfffffc0f;
> + if (aspects & VK_IMAGE_ASPECT_STENCIL_BIT)
> + mask |= 0x000003f0;
> + }
> +
> + return mask;
> +}
> +
> static bool
> radv_is_fast_clear_depth_allowed(VkClearDepthStencilValue value)
> {
> @@ -788,6 +887,7 @@ emit_fast_htile_clear(struct radv_cmd_buffer *cmd_buffer,
> VkClearDepthStencilValue clear_value = clear_att->clearValue.depthStencil;
> VkImageAspectFlags aspects = clear_att->aspectMask;
> uint32_t clear_word, flush_bits;
> + uint32_t htile_mask;
>
> if (!radv_image_has_htile(iview->image))
> return false;
> @@ -821,9 +921,10 @@ emit_fast_htile_clear(struct radv_cmd_buffer *cmd_buffer,
> if (clear_rect->layerCount != iview->image->info.array_size)
> return false;
>
> - if (!(aspects & VK_IMAGE_ASPECT_DEPTH_BIT) ||
> + if (cmd_buffer->device->physical_device->rad_info.chip_class < GFX9 &&
> + (!(aspects & VK_IMAGE_ASPECT_DEPTH_BIT) ||
> ((vk_format_aspects(iview->image->vk_format) & VK_IMAGE_ASPECT_STENCIL_BIT) &&
> - !(aspects & VK_IMAGE_ASPECT_STENCIL_BIT)))
> + !(aspects & VK_IMAGE_ASPECT_STENCIL_BIT))))
> return false;
>
> if (((aspects & VK_IMAGE_ASPECT_DEPTH_BIT) &&
> @@ -841,6 +942,7 @@ emit_fast_htile_clear(struct radv_cmd_buffer *cmd_buffer,
> return false;
>
> clear_word = radv_get_htile_fast_clear_value(iview->image, clear_value);
> + htile_mask = radv_get_htile_mask(iview->image, aspects);
>
> if (pre_flush) {
> cmd_buffer->state.flush_bits |= (RADV_CMD_FLAG_FLUSH_AND_INV_DB |
> @@ -850,9 +952,19 @@ emit_fast_htile_clear(struct radv_cmd_buffer *cmd_buffer,
> cmd_buffer->state.flush_bits |= RADV_CMD_FLAG_FLUSH_AND_INV_DB |
> RADV_CMD_FLAG_FLUSH_AND_INV_DB_META;
>
> - flush_bits = radv_fill_buffer(cmd_buffer, iview->image->bo,
> - iview->image->offset + iview->image->htile_offset,
> - iview->image->surface.htile_size, clear_word);
> + if (htile_mask == UINT_MAX) {
> + /* Clear the whole HTILE buffer. */
> + flush_bits = radv_fill_buffer(cmd_buffer, iview->image->bo,
> + iview->image->offset + iview->image->htile_offset,
> + iview->image->surface.htile_size, clear_word);
> + } else {
> + /* Only clear depth or stencil bytes in the HTILE buffer. */
> + assert(cmd_buffer->device->physical_device->rad_info.chip_class >= GFX9);
> + flush_bits = clear_htile_mask(cmd_buffer, iview->image->bo,
> + iview->image->offset + iview->image->htile_offset,
> + iview->image->surface.htile_size, clear_word,
> + htile_mask);
> + }
>
> radv_update_ds_clear_metadata(cmd_buffer, iview->image, clear_value, aspects);
> if (post_flush) {
> @@ -864,6 +976,148 @@ emit_fast_htile_clear(struct radv_cmd_buffer *cmd_buffer,
> return true;
> }
>
> +static nir_shader *
> +build_clear_htile_mask_shader()
> +{
> + nir_builder b;
> +
> + nir_builder_init_simple_shader(&b, NULL, MESA_SHADER_COMPUTE, NULL);
> + b.shader->info.name = ralloc_strdup(b.shader, "meta_clear_htile_mask");
> + b.shader->info.cs.local_size[0] = 64;
> + b.shader->info.cs.local_size[1] = 1;
> + b.shader->info.cs.local_size[2] = 1;
> +
> + nir_ssa_def *invoc_id = nir_load_system_value(&b, nir_intrinsic_load_local_invocation_id, 0);
> + nir_ssa_def *wg_id = nir_load_system_value(&b, nir_intrinsic_load_work_group_id, 0);
> + nir_ssa_def *block_size = nir_imm_ivec4(&b,
> + b.shader->info.cs.local_size[0],
> + b.shader->info.cs.local_size[1],
> + b.shader->info.cs.local_size[2], 0);
> +
> + nir_ssa_def *global_id = nir_iadd(&b, nir_imul(&b, wg_id, block_size), invoc_id);
> +
> + nir_ssa_def *offset = nir_imul(&b, global_id, nir_imm_int(&b, 16));
> + offset = nir_channel(&b, offset, 0);
> +
> + nir_intrinsic_instr *buf =
> + nir_intrinsic_instr_create(b.shader,
> + nir_intrinsic_vulkan_resource_index);
> +
> + buf->src[0] = nir_src_for_ssa(nir_imm_int(&b, 0));
> + nir_intrinsic_set_desc_set(buf, 0);
> + nir_intrinsic_set_binding(buf, 0);
> + nir_ssa_dest_init(&buf->instr, &buf->dest, 1, 32, NULL);
> + nir_builder_instr_insert(&b, &buf->instr);
> +
> + nir_intrinsic_instr *constants =
> + nir_intrinsic_instr_create(b.shader,
> + nir_intrinsic_load_push_constant);
> + nir_intrinsic_set_base(constants, 0);
> + nir_intrinsic_set_range(constants, 8);
> + constants->src[0] = nir_src_for_ssa(nir_imm_int(&b, 0));
> + constants->num_components = 2;
> + nir_ssa_dest_init(&constants->instr, &constants->dest, 2, 32, "constants");
> + nir_builder_instr_insert(&b, &constants->instr);
> +
> + nir_intrinsic_instr *load =
> + nir_intrinsic_instr_create(b.shader, nir_intrinsic_load_ssbo);
> + load->src[0] = nir_src_for_ssa(&buf->dest.ssa);
> + load->src[1] = nir_src_for_ssa(offset);
> + nir_ssa_dest_init(&load->instr, &load->dest, 4, 32, NULL);
> + load->num_components = 4;
> + nir_builder_instr_insert(&b, &load->instr);
> +
> + /* data = (data & ~htile_mask) | (htile_value & htile_mask) */
> + nir_ssa_def *data =
> + nir_iand(&b, &load->dest.ssa,
> + nir_channel(&b, &constants->dest.ssa, 1));
> + data = nir_ior(&b, data, nir_channel(&b, &constants->dest.ssa, 0));
Since data is an uvec4, don't we need to broadcast the constants to
all channels?
> +
> + nir_intrinsic_instr *store =
> + nir_intrinsic_instr_create(b.shader, nir_intrinsic_store_ssbo);
> + store->src[0] = nir_src_for_ssa(data);
> + store->src[1] = nir_src_for_ssa(&buf->dest.ssa);
> + store->src[2] = nir_src_for_ssa(offset);
> + nir_intrinsic_set_write_mask(store, 0xf);
> + store->num_components = 4;
> + nir_builder_instr_insert(&b, &store->instr);
> +
> + return b.shader;
> +}
> +
> +static VkResult
> +init_meta_clear_htile_mask_state(struct radv_device *device)
> +{
> + struct radv_meta_state *state = &device->meta_state;
> + struct radv_shader_module cs = { .nir = NULL };
> + VkResult result;
> +
> + cs.nir = build_clear_htile_mask_shader();
> +
> + VkDescriptorSetLayoutCreateInfo ds_layout_info = {
> + .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
> + .flags = VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR,
> + .bindingCount = 1,
> + .pBindings = (VkDescriptorSetLayoutBinding[]) {
> + {
> + .binding = 0,
> + .descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_BUFFER,
> + .descriptorCount = 1,
> + .stageFlags = VK_SHADER_STAGE_COMPUTE_BIT,
> + .pImmutableSamplers = NULL
> + },
> + }
> + };
> +
> + result = radv_CreateDescriptorSetLayout(radv_device_to_handle(device),
> + &ds_layout_info, &state->alloc,
> + &state->clear_htile_mask_ds_layout);
> + if (result != VK_SUCCESS)
> + goto fail;
> +
> + VkPipelineLayoutCreateInfo p_layout_info = {
> + .sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
> + .setLayoutCount = 1,
> + .pSetLayouts = &state->clear_htile_mask_ds_layout,
> + .pushConstantRangeCount = 1,
> + .pPushConstantRanges = &(VkPushConstantRange){
> + VK_SHADER_STAGE_COMPUTE_BIT, 0, 8,
> + },
> + };
> +
> + result = radv_CreatePipelineLayout(radv_device_to_handle(device),
> + &p_layout_info, &state->alloc,
> + &state->clear_htile_mask_p_layout);
> + if (result != VK_SUCCESS)
> + goto fail;
> +
> + VkPipelineShaderStageCreateInfo shader_stage = {
> + .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
> + .stage = VK_SHADER_STAGE_COMPUTE_BIT,
> + .module = radv_shader_module_to_handle(&cs),
> + .pName = "main",
> + .pSpecializationInfo = NULL,
> + };
> +
> + VkComputePipelineCreateInfo pipeline_info = {
> + .sType = VK_STRUCTURE_TYPE_COMPUTE_PIPELINE_CREATE_INFO,
> + .stage = shader_stage,
> + .flags = 0,
> + .layout = state->clear_htile_mask_p_layout,
> + };
> +
> + result = radv_CreateComputePipelines(radv_device_to_handle(device),
> + radv_pipeline_cache_to_handle(&state->cache),
> + 1, &pipeline_info, NULL,
> + &state->clear_htile_mask_pipeline);
> +
> + ralloc_free(cs.nir);
> + return result;
> +fail:
> + ralloc_free(cs.nir);
> + return result;
> +}
> +
> VkResult
> radv_device_init_meta_clear_state(struct radv_device *device, bool on_demand)
> {
> @@ -898,6 +1152,10 @@ radv_device_init_meta_clear_state(struct radv_device *device, bool on_demand)
> if (res != VK_SUCCESS)
> goto fail;
>
> + res = init_meta_clear_htile_mask_state(device);
> + if (res != VK_SUCCESS)
> + goto fail;
> +
> if (on_demand)
> return VK_SUCCESS;
>
> diff --git a/src/amd/vulkan/radv_private.h b/src/amd/vulkan/radv_private.h
> index 1628be1002..4d7e740905 100644
> --- a/src/amd/vulkan/radv_private.h
> +++ b/src/amd/vulkan/radv_private.h
> @@ -457,6 +457,12 @@ struct radv_meta_state {
>
> VkPipelineLayout clear_color_p_layout;
> VkPipelineLayout clear_depth_p_layout;
> +
> + /* Optimized compute fast HTILE clear for stencil or depth only. */
> + VkPipeline clear_htile_mask_pipeline;
> + VkPipelineLayout clear_htile_mask_p_layout;
> + VkDescriptorSetLayout clear_htile_mask_ds_layout;
> +
> struct {
> VkRenderPass render_pass[NUM_META_FS_KEYS][RADV_META_DST_LAYOUT_COUNT];
>
> --
> 2.19.1
>
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