vgem.c

   1 /*
   2  * Copyright 2016 The Chromium OS Authors. All rights reserved.
   3  * Use of this source code is governed by a BSD-style license that can be
   4  * found in the LICENSE file.
   5  */
   6
   7 #include "drv_priv.h"
   8 #include "helpers.h"
   9 #include "util.h"
  10
  11 #define MESA_LLVMPIPE_TILE_ORDER 6
  12 #define MESA_LLVMPIPE_TILE_SIZE (1 << MESA_LLVMPIPE_TILE_ORDER)
  13
  14 static struct supported_combination combos[4] = {
  15         {DRM_FORMAT_ABGR8888, DRM_FORMAT_MOD_NONE,
  16                 BO_USE_RENDERING | BO_USE_SW_READ_OFTEN | BO_USE_SW_WRITE_OFTEN},
  17         {DRM_FORMAT_RGB565, DRM_FORMAT_MOD_NONE,
  18                 BO_USE_RENDERING | BO_USE_SW_READ_RARELY | BO_USE_SW_WRITE_RARELY},
  19         {DRM_FORMAT_XBGR8888, DRM_FORMAT_MOD_NONE,
  20                 BO_USE_RENDERING | BO_USE_SW_READ_OFTEN | BO_USE_SW_WRITE_OFTEN |
  21                 BO_USE_SW_READ_RARELY | BO_USE_SW_WRITE_RARELY},
  22         {DRM_FORMAT_YVU420, DRM_FORMAT_MOD_NONE,
  23                 BO_USE_RENDERING | BO_USE_SW_READ_RARELY | BO_USE_SW_WRITE_RARELY},
  24 };
  25
  26 static int vgem_init(struct driver *drv)
  27 {
  28         drv_insert_combinations(drv, combos, ARRAY_SIZE(combos));
  29         return 0;
  30 }
  31
  32 static int vgem_bo_create(struct bo *bo, uint32_t width, uint32_t height,
  33                           uint32_t format, uint32_t flags)
  34 {
  35         int ret = drv_dumb_bo_create(bo, ALIGN(width, MESA_LLVMPIPE_TILE_SIZE),
  36                                      ALIGN(height, MESA_LLVMPIPE_TILE_SIZE),
  37                                      format, flags);
  38         bo->width = width;
  39         bo->height = height;
  40
  41         return ret;
  42 }
  43
  44 static uint32_t vgem_resolve_format(uint32_t format)
  45 {
  46         switch (format) {
  47         case DRM_FORMAT_FLEX_IMPLEMENTATION_DEFINED:
  48                 /*HACK: See b/28671744 */
  49                 return DRM_FORMAT_XBGR8888;
  50         case DRM_FORMAT_FLEX_YCbCr_420_888:
  51                 return DRM_FORMAT_YVU420;
  52         default:
  53                 return format;
  54         }
  55 }
  56
  57 struct backend backend_vgem =
  58 {
  59         .name = "vgem",
  60         .init = vgem_init,
  61         .bo_create = vgem_bo_create,
  62         .bo_destroy = drv_dumb_bo_destroy,
  63         .bo_map = drv_dumb_bo_map,
  64         .resolve_format = vgem_resolve_format,
  65 };
  66