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src/intel/isl/isl_gfx9.c

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+/*
+ * Copyright 2015 Intel Corporation
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a
+ *  copy of this software and associated documentation files (the "Software"),
+ *  to deal in the Software without restriction, including without limitation
+ *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ *  and/or sell copies of the Software, and to permit persons to whom the
+ *  Software is furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice (including the next
+ *  paragraph) shall be included in all copies or substantial portions of the
+ *  Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ *  IN THE SOFTWARE.
+ */
+
+#include "isl_gfx8.h"
+#include "isl_gfx9.h"
+#include "isl_priv.h"
+
+void
+isl_gfx9_choose_image_alignment_el(const struct isl_device *dev,
+                                   const struct isl_surf_init_info *restrict info,
+                                   const struct isl_tile_info *tile_info,
+                                   enum isl_dim_layout dim_layout,
+                                   enum isl_msaa_layout msaa_layout,
+                                   struct isl_extent3d *image_align_el)
+{
+   enum isl_tiling tiling = tile_info->tiling;
+
+   /* Handled by isl_choose_image_alignment_el */
+   assert(info->format != ISL_FORMAT_HIZ);
+
+   const struct isl_format_layout *fmtl = isl_format_get_layout(info->format);
+   if (fmtl->txc == ISL_TXC_CCS) {
+      /* Sky Lake PRM Vol. 7, "MCS Buffer for Render Target(s)" (p. 632):
+       *
+       *    "Mip-mapped and arrayed surfaces are supported with MCS buffer
+       *    layout with these alignments in the RT space: Horizontal
+       *    Alignment = 128 and Vertical Alignment = 64."
+       */
+      *image_align_el = isl_extent3d(128 / fmtl->bw, 64 / fmtl->bh, 1);
+      return;
+   }
+
+   /* This BSpec text provides some insight into the hardware's alignment
+    * requirements [Skylake BSpec > Memory Views > Common Surface Formats >
+    * Surface Layout and Tiling > 2D Surfaces]:
+    *
+    *    An LOD must be aligned to a cache-line except for some special cases
+    *    related to Planar YUV surfaces.  In general, the cache-alignment
+    *    restriction implies there is a minimum height for an LOD of 4 texels.
+    *    So, LODs which are smaller than 4 high are padded.
+    *
+    * From the Skylake BSpec, RENDER_SURFACE_STATE Surface Vertical Alignment:
+    *
+    *    - For Sampling Engine and Render Target Surfaces: This field
+    *      specifies the vertical alignment requirement in elements for the
+    *      surface. [...] An element is defined as a pixel in uncompressed
+    *      surface formats, and as a compression block in compressed surface
+    *      formats. For MSFMT_DEPTH_STENCIL type multisampled surfaces, an
+    *      element is a sample.
+    *
+    *    - This field is used for 2D, CUBE, and 3D surface alignment when Tiled
+    *      Resource Mode is TRMODE_NONE (Tiled Resource Mode is disabled).
+    *      This field is ignored for 1D surfaces and also when Tiled Resource
+    *      Mode is not TRMODE_NONE (e.g. Tiled Resource Mode is enabled).
+    *
+    *      See the appropriate Alignment  table in the "Surface Layout and
+    *      Tiling" section under Common Surface Formats for the table of
+    *      alignment values for Tiled Resources.
+    *
+    *    - For uncompressed surfaces, the units of "j" are rows of pixels on
+    *      the physical surface. For compressed texture formats, the units of
+    *      "j" are in compression blocks, thus each increment in "j" is equal
+    *      to h pixels, where h is the height of the compression block in
+    *      pixels.
+    *
+    *    - Valid Values: VALIGN_4, VALIGN_8, VALIGN_16
+    *
+    * From the Skylake BSpec, RENDER_SURFACE_STATE Surface Horizontal
+    * Alignment:
+    *
+    *    -  For uncompressed surfaces, the units of "i" are pixels on the
+    *       physical surface. For compressed texture formats, the units of "i"
+    *       are in compression blocks, thus each increment in "i" is equal to
+    *       w pixels, where w is the width of the compression block in pixels.
+    *
+    *    - Valid Values: HALIGN_4, HALIGN_8, HALIGN_16
+    */
+
+   if (isl_tiling_is_std_y(tiling)) {
+      /* Ys and Yf tiled images are aligned to the tile size */
+      *image_align_el = (struct isl_extent3d) {
+         .w = tile_info->logical_extent_el.w,
+         .h = tile_info->logical_extent_el.h,
+         .d = tile_info->logical_extent_el.d,
+      };
+      return;
+   }
+
+   if (dim_layout == ISL_DIM_LAYOUT_GFX9_1D) {
+      /* See the Skylake BSpec > Memory Views > Common Surface Formats > Surface
+       * Layout and Tiling > 1D Surfaces > 1D Alignment Requirements.
+       */
+      *image_align_el = isl_extent3d(64, 1, 1);
+      return;
+   }
+
+   if (isl_format_is_compressed(info->format)) {
+      /* On Gfx9, the meaning of RENDER_SURFACE_STATE's
+       * SurfaceHorizontalAlignment and SurfaceVerticalAlignment changed for
+       * compressed formats. They now indicate a multiple of the compression
+       * block.  For example, if the compression mode is ETC2 then HALIGN_4
+       * indicates a horizontal alignment of 16 pixels.
+       *
+       * To avoid wasting memory, choose the smallest alignment possible:
+       * HALIGN_4 and VALIGN_4.
+       */
+      *image_align_el = isl_extent3d(4, 4, 1);
+      return;
+   }
+
+   isl_gfx8_choose_image_alignment_el(dev, info, tiling, dim_layout,
+                                      msaa_layout, image_align_el);
+}