[Mesa-dev] [PATCH V2 08/11] anv/cmd_buffer: Add code for performing HZ operations
Chad Versace
chadversary at chromium.org
Tue Sep 27 18:00:14 UTC 2016
On Mon 26 Sep 2016, Nanley Chery wrote:
> Create a function that performs one of three HiZ operations -
> depth/stencil clears, HiZ resolve, and depth resolves.
>
> Signed-off-by: Nanley Chery <nanley.g.chery at intel.com>
>
> ---
>
> v2. Add documentation
> Fix the alignment check
> Don't minify clear rectangle (Jason)
> Use blorp enums (Jason)
> Enable depth stalls and flushes
> Use full RT rectangle for resolve ops
> Add stencil clear todo
>
> src/intel/vulkan/anv_genX.h | 3 +
> src/intel/vulkan/gen7_cmd_buffer.c | 6 ++
> src/intel/vulkan/gen8_cmd_buffer.c | 167 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 176 insertions(+)
> +/**
> + * Emit the HZ_OP packet in the sequence specified by the BDW PRM section
> + * entitled: "Optimized Depth Buffer Clear and/or Stencil Buffer Clear."
> + *
> + * \todo Enable Stencil Buffer-only clears
> + */
> +void
> +genX(cmd_buffer_do_hz_op)(struct anv_cmd_buffer *cmd_buffer,
> + enum blorp_hiz_op op)
> +{
All other "emission" functions in gen8_cmd_buffer.c are named
gen8_cmd_buffer_emit_foo(). I think this funtion should be named
gen8_cmd_buffer_emit_hz_op for consistency.
> + struct anv_cmd_state *cmd_state = &cmd_buffer->state;
> + const struct anv_image_view *iview =
> + anv_cmd_buffer_get_depth_stencil_view(cmd_buffer);
> +
> + if (iview == NULL || !anv_image_has_hiz(iview->image))
> + return;
Shouldn't this check for subpass_count > 1, like the previous patches
do?
> +
> + const uint32_t ds = cmd_state->subpass->depth_stencil_attachment;
> + const bool full_surface_op =
> + cmd_state->render_area.extent.width == iview->extent.width &&
> + cmd_state->render_area.extent.height == iview->extent.height;
> +
> + /* Validate that we can perform the HZ operation and that it's necessary. */
> + switch (op) {
> + case BLORP_HIZ_OP_DEPTH_CLEAR:
> + if (cmd_buffer->state.pass->attachments[ds].load_op !=
> + VK_ATTACHMENT_LOAD_OP_CLEAR)
> + return;
> +
> + /* Apply alignment restrictions. Despite the BDW PRM mentioning this is
> + * only needed for a depth buffer surface type of D16_UNORM, testing
> + * showed it to be necessary for other depth formats as well
> + * (e.g., D32_FLOAT).
> + */
> + if (!full_surface_op) {
> +
> + struct isl_extent2d px_dim;
> +#if GEN_GEN == 8
> + /* Pre-SKL, HiZ has an 8x4 sample block. As the number of samples
> + * increases, the number of pixels representable by this block
> + * decreases by a factor of the sample dimensions. Sample dimensions
> + * scale following the MSAA interleaved pattern.
> + *
> + * Sample|Sample|Pixel
> + * Count |Dim |Dim
> + * ===================
> + * 1 | 1x1 | 8x4
> + * 2 | 2x1 | 4x4
> + * 4 | 2x2 | 4x2
> + * 8 | 4x2 | 2x2
> + * 16 | 4x4 | 2x1
> + *
> + * Table: Pixel Dimensions in a HiZ Sample Block Pre-SKL
> + */
> + const struct isl_extent2d sa_dim =
> + isl_get_interleaved_msaa_px_size_sa(iview->image->samples);
> + px_dim.w = 8 / sa_dim.w;
> + px_dim.h = 4 / sa_dim.h;
> +#else
> + /* SKL+, the sample block becomes a "pixel block" so the expected
> + * pixel dimension is a constant 8x4 px for all sample counts.
> + */
> + px_dim = (struct isl_extent2d) { .w = 8, .h = 4};
> +#endif
> +
> + /* Fast depth clears clear an entire sample block at a time. As a
> + * result, the rectangle must be aligned to the pixel dimensions of
> + * a sample block for a successful operation.
> + */
> + if (cmd_state->render_area.offset.x % px_dim.w ||
> + cmd_state->render_area.offset.y % px_dim.h ||
> + cmd_state->render_area.extent.width % px_dim.w ||
> + cmd_state->render_area.extent.height % px_dim.h)
> + return;
> + }
> + break;
> + case BLORP_HIZ_OP_DEPTH_RESOLVE:
> + if (cmd_buffer->state.pass->attachments[ds].store_op !=
> + VK_ATTACHMENT_STORE_OP_STORE)
> + return;
> + break;
> + case BLORP_HIZ_OP_HIZ_RESOLVE:
> + if (cmd_buffer->state.pass->attachments[ds].load_op !=
> + VK_ATTACHMENT_LOAD_OP_LOAD)
> + return;
> + break;
> + case BLORP_HIZ_OP_NONE:
> + unreachable("Invalid HiZ OP");
> + break;
> + }
> +
> + anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_WM_HZ_OP), hzp) {
> + switch (op) {
> + case BLORP_HIZ_OP_DEPTH_CLEAR:
> + hzp.StencilBufferClearEnable = VK_IMAGE_ASPECT_STENCIL_BIT &
> + cmd_state->attachments[ds].pending_clear_aspects;
> + hzp.DepthBufferClearEnable = VK_IMAGE_ASPECT_DEPTH_BIT &
> + cmd_state->attachments[ds].pending_clear_aspects;
> + hzp.FullSurfaceDepthandStencilClear = full_surface_op;
> + hzp.StencilClearValue = 0xff &
> + cmd_state->attachments[ds].clear_value.depthStencil.stencil;
> +
> + /* Mark aspects as cleared */
> + cmd_state->attachments[ds].pending_clear_aspects = 0;
> + break;
> + case BLORP_HIZ_OP_DEPTH_RESOLVE:
> + hzp.DepthBufferResolveEnable = true;
> + break;
> + case BLORP_HIZ_OP_HIZ_RESOLVE:
> + hzp.HierarchicalDepthBufferResolveEnable = true;
> + break;
> + case BLORP_HIZ_OP_NONE:
> + unreachable("Invalid HiZ OP");
> + break;
> + }
> +
> + if (op != BLORP_HIZ_OP_DEPTH_CLEAR) {
> + /* The Optimized HiZ resolve rectangle must be the size of the full RT
> + * and aligned to 8x4. The non-optimized Depth resolve rectangle must
> + * be the size of the full RT. The same alignment is assumed to be
> + * required.
> + *
> + * TODO:
> + * Consider changing halign of non-D16 depth formats to 8 as mip 2 may
> + * get clobbered.
Jason and I did some experiments on BDW and SKL. The SKL hardware aligns
the hiz surface correctly for all miplevels, so the clobbered-miplevel-2
issue is a non-issue. If I recall correctly, BDW hardware also
eliminates the clobbered-miplevel-2 issue; but I'm not 100% sure, so ask
Jason. Pre-gen8 definitely suffers from the clobbered-miplevel-2 issue.
It would be very very good to list in the comment which hardware does
and does not suffer from the issue, as that's not documented anywhere.
> + */
For readability, please explicity do
hzp.ClearRectangleXMin = 0;
hzp.ClearRectangleYMin = 0;
> + hzp.ClearRectangleXMax = align_u32(iview->extent.width, 8);
> + hzp.ClearRectangleYMax = align_u32(iview->extent.height, 4);
> + } else {
> + /* This clear rectangle is aligned */
> + hzp.ClearRectangleXMin = cmd_state->render_area.offset.x;
> + hzp.ClearRectangleYMin = cmd_state->render_area.offset.y;
> + hzp.ClearRectangleXMax = cmd_state->render_area.offset.x +
> + cmd_state->render_area.extent.width;
> + hzp.ClearRectangleYMax = cmd_state->render_area.offset.y +
> + cmd_state->render_area.extent.height;
> + }
> +
> +
> + /* Due to a hardware issue, this bit MBZ */
> + hzp.ScissorRectangleEnable = false;
> + hzp.NumberofMultisamples = ffs(iview->image->samples) - 1;
> + hzp.SampleMask = 0xFFFF;
> + }
> +
> + anv_batch_emit(&cmd_buffer->batch, GENX(PIPE_CONTROL), pc) {
> + pc.PostSyncOperation = WriteImmediateData;
> + pc.Address =
> + (struct anv_address){ &cmd_buffer->device->workaround_bo, 0 };
> + }
> +
> + anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_WM_HZ_OP), hzp);
> +
> + /* TODO:
> + * Determine if a DepthCacheFlushEnable and DepthStallEnable is really
> + * necessary for non-full_surface_op clears. Performing a HZ op without
> + * this pipecontrol showed no impact on rendering results.
> + */
> + if (!full_surface_op && op == BLORP_HIZ_OP_DEPTH_CLEAR) {
> + anv_batch_emit(&cmd_buffer->batch, GENX(PIPE_CONTROL), pc) {
> + pc.DepthStallEnable = true;
> + pc.DepthCacheFlushEnable = true;
> + }
> + }
> +}
> +
> void genX(CmdSetEvent)(
> VkCommandBuffer commandBuffer,
> VkEvent _event,
> --
> 2.10.0
>
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