vc4.c

   1 /*
   2  * Copyright 2017 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 #ifdef DRV_VC4
   8
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <sys/mman.h>
  12 #include <vc4_drm.h>
  13 #include <xf86drm.h>
  14
  15 #include "drv_priv.h"
  16 #include "helpers.h"
  17 #include "util.h"
  18
  19 static const uint32_t supported_formats[] = {
  20         DRM_FORMAT_ARGB8888, DRM_FORMAT_RGB565, DRM_FORMAT_XRGB8888
  21 };
  22
  23 static int vc4_init(struct driver *drv)
  24 {
  25         return drv_add_linear_combinations(drv, supported_formats,
  26                                            ARRAY_SIZE(supported_formats));
  27 }
  28
  29 static int vc4_bo_create(struct bo *bo, uint32_t width, uint32_t height,
  30                          uint32_t format, uint32_t flags)
  31 {
  32         int ret;
  33         size_t plane;
  34         struct drm_vc4_create_bo bo_create;
  35
  36         drv_bo_from_format(bo, width, height, format);
  37
  38         memset(&bo_create, 0, sizeof(bo_create));
  39         bo_create.size = bo->total_size;
  40
  41         ret = drmIoctl(bo->drv->fd, DRM_IOCTL_VC4_CREATE_BO, &bo_create);
  42         if (ret) {
  43                 fprintf(stderr, "drv: DRM_IOCTL_VC4_GEM_CREATE failed "
  44                                 "(size=%zu)\n", bo->total_size);
  45                 return ret;
  46         }
  47
  48         for (plane = 0; plane < bo->num_planes; plane++)
  49                 bo->handles[plane].u32 = bo_create.handle;
  50
  51         return 0;
  52 }
  53
  54 static void *vc4_bo_map(struct bo *bo, struct map_info *data, size_t plane)
  55 {
  56         int ret;
  57         struct drm_vc4_mmap_bo bo_map;
  58
  59         memset(&bo_map, 0, sizeof(bo_map));
  60         bo_map.handle = bo->handles[0].u32;
  61
  62         ret = drmCommandWriteRead(bo->drv->fd, DRM_VC4_MMAP_BO, &bo_map,
  63                                   sizeof(bo_map));
  64         if (ret) {
  65                 fprintf(stderr, "drv: DRM_VC4_MMAP_BO failed\n");
  66                 return MAP_FAILED;
  67         }
  68
  69         data->length = bo->total_size;
  70
  71         return mmap(0, bo->total_size, PROT_READ | PROT_WRITE, MAP_SHARED,
  72                     bo->drv->fd, bo_map.offset);
  73 }
  74
  75 struct backend backend_vc4 =
  76 {
  77         .name = "vc4",
  78         .init = vc4_init,
  79         .bo_create = vc4_bo_create,
  80         .bo_import = drv_prime_bo_import,
  81         .bo_destroy = drv_gem_bo_destroy,
  82         .bo_map = vc4_bo_map,
  83 };
  84
  85 #endif