[Mesa-dev] [PATCH v2 7/7] anv: Implement the Skylake stencil PMA optimization
Nanley Chery
nanleychery at gmail.com
Tue Feb 14 01:00:02 UTC 2017
On Fri, Feb 10, 2017 at 11:02:21AM -0800, Jason Ekstrand wrote:
> This improves the performance of Dota 2 on my Sky Lake Skull Canyon
> machine by about 2-3%.
>
This patch looks good. Could we compare our setup and testing in the
office? I can't reproduce these numbers.
-Nanley
> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> ---
> src/intel/vulkan/anv_private.h | 1 +
> src/intel/vulkan/gen8_cmd_buffer.c | 157 ++++++++++++++++++++++++++++++++++++-
> src/intel/vulkan/genX_pipeline.c | 6 +-
> 3 files changed, 158 insertions(+), 6 deletions(-)
>
> diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
> index fa6032e..25c9c93 100644
> --- a/src/intel/vulkan/anv_private.h
> +++ b/src/intel/vulkan/anv_private.h
> @@ -1482,6 +1482,7 @@ struct anv_pipeline {
> bool writes_depth;
> bool depth_test_enable;
> bool writes_stencil;
> + bool stencil_test_enable;
> bool depth_clamp_enable;
> bool kill_pixel;
>
> diff --git a/src/intel/vulkan/gen8_cmd_buffer.c b/src/intel/vulkan/gen8_cmd_buffer.c
> index 0628f3a..59fd537 100644
> --- a/src/intel/vulkan/gen8_cmd_buffer.c
> +++ b/src/intel/vulkan/gen8_cmd_buffer.c
> @@ -157,16 +157,39 @@ __emit_sf_state(struct anv_cmd_buffer *cmd_buffer)
> void
> genX(cmd_buffer_enable_pma_fix)(struct anv_cmd_buffer *cmd_buffer, bool enable)
> {
> -#if GEN_GEN == 8
> if (cmd_buffer->state.pma_fix_enabled == enable)
> return;
>
> + cmd_buffer->state.pma_fix_enabled = enable;
> +
> + /* According to the Broadwell PIPE_CONTROL documentation, software should
> + * emit a PIPE_CONTROL with the CS Stall and Depth Cache Flush bits set
> + * prior to the LRI. If stencil buffer writes are enabled, then a Render
> + * Cache Flush is also necessary.
> + *
> + * The Skylake docs say to use a depth stall rather than a command
> + * streamer stall. However, the hardware seems to violently disagree.
> + * A full command streamer stall seems to be needed in both cases.
> + */
> anv_batch_emit(&cmd_buffer->batch, GENX(PIPE_CONTROL), pc) {
> pc.DepthCacheFlushEnable = true;
> pc.CommandStreamerStallEnable = true;
> pc.RenderTargetCacheFlushEnable = true;
> }
>
> +#if GEN_GEN == 9
> +
> + uint32_t cache_mode;
> + anv_pack_struct(&cache_mode, GENX(CACHE_MODE_0),
> + .STCPMAOptimizationEnable = enable,
> + .STCPMAOptimizationEnableMask = true);
> + anv_batch_emit(&cmd_buffer->batch, GENX(MI_LOAD_REGISTER_IMM), lri) {
> + lri.RegisterOffset = GENX(CACHE_MODE_0_num);
> + lri.DataDWord = cache_mode;
> + }
> +
> +#elif GEN_GEN == 8
> +
> uint32_t cache_mode;
> anv_pack_struct(&cache_mode, GENX(CACHE_MODE_1),
> .NPPMAFixEnable = enable,
> @@ -178,18 +201,20 @@ genX(cmd_buffer_enable_pma_fix)(struct anv_cmd_buffer *cmd_buffer, bool enable)
> lri.DataDWord = cache_mode;
> }
>
> +#endif /* GEN_GEN == 8 */
> +
> /* After the LRI, a PIPE_CONTROL with both the Depth Stall and Depth Cache
> * Flush bits is often necessary. We do it regardless because it's easier.
> * The render cache flush is also necessary if stencil writes are enabled.
> + *
> + * Again, the Skylake docs give a different set of flushes but the BDW
> + * flushes seem to work just as well.
> */
> anv_batch_emit(&cmd_buffer->batch, GENX(PIPE_CONTROL), pc) {
> pc.DepthStallEnable = true;
> pc.DepthCacheFlushEnable = true;
> pc.RenderTargetCacheFlushEnable = true;
> }
> -
> - cmd_buffer->state.pma_fix_enabled = enable;
> -#endif /* GEN_GEN == 8 */
> }
>
> static inline bool
> @@ -281,6 +306,126 @@ want_depth_pma_fix(struct anv_cmd_buffer *cmd_buffer)
> wm_prog_data->computed_depth_mode != PSCDEPTH_OFF;
> }
>
> +static inline bool
> +want_stencil_pma_fix(struct anv_cmd_buffer *cmd_buffer)
> +{
> + assert(GEN_GEN == 9);
> +
> + /* From the Skylake PRM Vol. 2c CACHE_MODE_1::STC PMA Optimization Enable:
> + *
> + * Clearing this bit will force the STC cache to wait for pending
> + * retirement of pixels at the HZ-read stage and do the STC-test for
> + * Non-promoted, R-computed and Computed depth modes instead of
> + * postponing the STC-test to RCPFE.
> + *
> + * STC_TEST_EN = 3DSTATE_STENCIL_BUFFER::STENCIL_BUFFER_ENABLE &&
> + * 3DSTATE_WM_DEPTH_STENCIL::StencilTestEnable
> + *
> + * STC_WRITE_EN = 3DSTATE_STENCIL_BUFFER::STENCIL_BUFFER_ENABLE &&
> + * (3DSTATE_WM_DEPTH_STENCIL::Stencil Buffer Write Enable &&
> + * 3DSTATE_DEPTH_BUFFER::STENCIL_WRITE_ENABLE)
> + *
> + * COMP_STC_EN = STC_TEST_EN &&
> + * 3DSTATE_PS_EXTRA::PixelShaderComputesStencil
> + *
> + * SW parses the pipeline states to generate the following logical
> + * signal indicating if PMA FIX can be enabled.
> + *
> + * STC_PMA_OPT =
> + * 3DSTATE_WM::ForceThreadDispatch != 1 &&
> + * !(3DSTATE_RASTER::ForceSampleCount != NUMRASTSAMPLES_0) &&
> + * 3DSTATE_DEPTH_BUFFER::SURFACE_TYPE != NULL &&
> + * 3DSTATE_DEPTH_BUFFER::HIZ Enable &&
> + * !(3DSTATE_WM::EDSC_Mode == 2) &&
> + * 3DSTATE_PS_EXTRA::PixelShaderValid &&
> + * !(3DSTATE_WM_HZ_OP::DepthBufferClear ||
> + * 3DSTATE_WM_HZ_OP::DepthBufferResolve ||
> + * 3DSTATE_WM_HZ_OP::Hierarchical Depth Buffer Resolve Enable ||
> + * 3DSTATE_WM_HZ_OP::StencilBufferClear) &&
> + * (COMP_STC_EN || STC_WRITE_EN) &&
> + * ((3DSTATE_PS_EXTRA::PixelShaderKillsPixels ||
> + * 3DSTATE_WM::ForceKillPix == ON ||
> + * 3DSTATE_PS_EXTRA::oMask Present to RenderTarget ||
> + * 3DSTATE_PS_BLEND::AlphaToCoverageEnable ||
> + * 3DSTATE_PS_BLEND::AlphaTestEnable ||
> + * 3DSTATE_WM_CHROMAKEY::ChromaKeyKillEnable) ||
> + * (3DSTATE_PS_EXTRA::Pixel Shader Computed Depth mode != PSCDEPTH_OFF))
> + */
> +
> + /* These are always true:
> + * 3DSTATE_WM::ForceThreadDispatch != 1 &&
> + * !(3DSTATE_RASTER::ForceSampleCount != NUMRASTSAMPLES_0)
> + */
> +
> + /* We only enable the PMA fix if we know for certain that HiZ is enabled.
> + * If we don't know whether HiZ is enabled or not, we disable the PMA fix
> + * and there is no harm.
> + *
> + * (3DSTATE_DEPTH_BUFFER::SURFACE_TYPE != NULL) &&
> + * 3DSTATE_DEPTH_BUFFER::HIZ Enable
> + */
> + if (!cmd_buffer->state.hiz_enabled)
> + return false;
> +
> + /* We can't possibly know if HiZ is enabled without the framebuffer */
> + assert(cmd_buffer->state.framebuffer);
> +
> + /* HiZ is enabled so we had better have a depth buffer with HiZ */
> + const struct anv_image_view *ds_iview =
> + anv_cmd_buffer_get_depth_stencil_view(cmd_buffer);
> + assert(ds_iview && ds_iview->image->aux_usage == ISL_AUX_USAGE_HIZ);
> +
> + /* 3DSTATE_PS_EXTRA::PixelShaderValid */
> + struct anv_pipeline *pipeline = cmd_buffer->state.pipeline;
> + if (!anv_pipeline_has_stage(pipeline, MESA_SHADER_FRAGMENT))
> + return false;
> +
> + /* !(3DSTATE_WM::EDSC_Mode == 2) */
> + const struct brw_wm_prog_data *wm_prog_data = get_wm_prog_data(pipeline);
> + if (wm_prog_data->early_fragment_tests)
> + return false;
> +
> + /* We never use anv_pipeline for HiZ ops so this is trivially true:
> + * !(3DSTATE_WM_HZ_OP::DepthBufferClear ||
> + * 3DSTATE_WM_HZ_OP::DepthBufferResolve ||
> + * 3DSTATE_WM_HZ_OP::Hierarchical Depth Buffer Resolve Enable ||
> + * 3DSTATE_WM_HZ_OP::StencilBufferClear)
> + */
> +
> + /* 3DSTATE_STENCIL_BUFFER::STENCIL_BUFFER_ENABLE &&
> + * 3DSTATE_WM_DEPTH_STENCIL::StencilTestEnable
> + */
> + const bool stc_test_en =
> + (ds_iview->image->aspects & VK_IMAGE_ASPECT_STENCIL_BIT) &&
> + pipeline->stencil_test_enable;
> +
> + /* 3DSTATE_STENCIL_BUFFER::STENCIL_BUFFER_ENABLE &&
> + * (3DSTATE_WM_DEPTH_STENCIL::Stencil Buffer Write Enable &&
> + * 3DSTATE_DEPTH_BUFFER::STENCIL_WRITE_ENABLE)
> + */
> + const bool stc_write_en =
> + (ds_iview->image->aspects & VK_IMAGE_ASPECT_STENCIL_BIT) &&
> + pipeline->writes_stencil;
> +
> + /* STC_TEST_EN && 3DSTATE_PS_EXTRA::PixelShaderComputesStencil */
> + const bool comp_stc_en = stc_test_en && wm_prog_data->computed_stencil;
> +
> + /* COMP_STC_EN || STC_WRITE_EN */
> + if (!(comp_stc_en || stc_write_en))
> + return false;
> +
> + /* (3DSTATE_PS_EXTRA::PixelShaderKillsPixels ||
> + * 3DSTATE_WM::ForceKillPix == ON ||
> + * 3DSTATE_PS_EXTRA::oMask Present to RenderTarget ||
> + * 3DSTATE_PS_BLEND::AlphaToCoverageEnable ||
> + * 3DSTATE_PS_BLEND::AlphaTestEnable ||
> + * 3DSTATE_WM_CHROMAKEY::ChromaKeyKillEnable) ||
> + * (3DSTATE_PS_EXTRA::Pixel Shader Computed Depth mode != PSCDEPTH_OFF)
> + */
> + return pipeline->kill_pixel ||
> + wm_prog_data->computed_depth_mode != PSCDEPTH_OFF;
> +}
> +
> void
> genX(cmd_buffer_flush_dynamic_state)(struct anv_cmd_buffer *cmd_buffer)
> {
> @@ -390,6 +535,7 @@ genX(cmd_buffer_flush_dynamic_state)(struct anv_cmd_buffer *cmd_buffer)
> }
>
> if (cmd_buffer->state.dirty & (ANV_CMD_DIRTY_PIPELINE |
> + ANV_CMD_DIRTY_RENDER_TARGETS |
> ANV_CMD_DIRTY_DYNAMIC_STENCIL_COMPARE_MASK |
> ANV_CMD_DIRTY_DYNAMIC_STENCIL_WRITE_MASK |
> ANV_CMD_DIRTY_DYNAMIC_STENCIL_REFERENCE)) {
> @@ -415,6 +561,9 @@ genX(cmd_buffer_flush_dynamic_state)(struct anv_cmd_buffer *cmd_buffer)
>
> anv_batch_emit_merge(&cmd_buffer->batch, dwords,
> pipeline->gen9.wm_depth_stencil);
> +
> + genX(cmd_buffer_enable_pma_fix)(cmd_buffer,
> + want_stencil_pma_fix(cmd_buffer));
> }
> #endif
>
> diff --git a/src/intel/vulkan/genX_pipeline.c b/src/intel/vulkan/genX_pipeline.c
> index d2af8b9..3b0ae08 100644
> --- a/src/intel/vulkan/genX_pipeline.c
> +++ b/src/intel/vulkan/genX_pipeline.c
> @@ -784,6 +784,7 @@ emit_ds_state(struct anv_pipeline *pipeline,
> * to make sure it's initialized to something useful.
> */
> pipeline->writes_stencil = false;
> + pipeline->stencil_test_enable = false;
> pipeline->writes_depth = false;
> pipeline->depth_test_enable = false;
> memset(depth_stencil_dw, 0, sizeof(depth_stencil_dw));
> @@ -799,6 +800,7 @@ emit_ds_state(struct anv_pipeline *pipeline,
>
> VkPipelineDepthStencilStateCreateInfo info = *pCreateInfo;
> sanitize_ds_state(&info, &pipeline->writes_stencil, ds_aspects);
> + pipeline->stencil_test_enable = info.stencilTestEnable;
> pipeline->writes_depth = info.depthWriteEnable;
> pipeline->depth_test_enable = info.depthTestEnable;
>
> @@ -1556,8 +1558,8 @@ compute_kill_pixel(struct anv_pipeline *pipeline,
> const struct brw_wm_prog_data *wm_prog_data = get_wm_prog_data(pipeline);
>
> /* This computes the KillPixel portion of the computation for whether or
> - * not we want to enable the PMA fix on gen8. It's given by this chunk of
> - * the giant formula:
> + * not we want to enable the PMA fix on gen8 or gen9. It's given by this
> + * chunk of the giant formula:
> *
> * (3DSTATE_PS_EXTRA::PixelShaderKillsPixels ||
> * 3DSTATE_PS_EXTRA::oMask Present to RenderTarget ||
> --
> 2.5.0.400.gff86faf
>
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