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 render_target_formats[] = { DRM_FORMAT_ARGB8888, DRM_FORMAT_RGB565,
  20                                                   DRM_FORMAT_XRGB8888 };
  21
  22 static int vc4_init(struct driver *drv)
  23 {
  24         int ret;
  25         ret = drv_add_combinations(drv, render_target_formats, ARRAY_SIZE(render_target_formats),
  26                                    &LINEAR_METADATA, BO_USE_RENDER_MASK);
  27         if (ret)
  28                 return ret;
  29
  30         return drv_modify_linear_combinations(drv);
  31 }
  32
  33 static int vc4_bo_create(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
  34                          uint64_t use_flags)
  35 {
  36         int ret;
  37         size_t plane;
  38         uint32_t stride;
  39         struct drm_vc4_create_bo bo_create;
  40
  41         /*
  42          * Since the ARM L1 cache line size is 64 bytes, align to that as a
  43          * performance optimization.
  44          */
  45         stride = drv_stride_from_format(format, width, 0);
  46         stride = ALIGN(stride, 64);
  47         drv_bo_from_format(bo, stride, height, format);
  48
  49         memset(&bo_create, 0, sizeof(bo_create));
  50         bo_create.size = bo->total_size;
  51
  52         ret = drmIoctl(bo->drv->fd, DRM_IOCTL_VC4_CREATE_BO, &bo_create);
  53         if (ret) {
  54                 fprintf(stderr, "drv: DRM_IOCTL_VC4_GEM_CREATE failed (size=%zu)\n",
  55                         bo->total_size);
  56                 return ret;
  57         }
  58
  59         for (plane = 0; plane < bo->num_planes; plane++)
  60                 bo->handles[plane].u32 = bo_create.handle;
  61
  62         return 0;
  63 }
  64
  65 static void *vc4_bo_map(struct bo *bo, struct map_info *data, size_t plane, uint32_t map_flags)
  66 {
  67         int ret;
  68         struct drm_vc4_mmap_bo bo_map;
  69
  70         memset(&bo_map, 0, sizeof(bo_map));
  71         bo_map.handle = bo->handles[0].u32;
  72
  73         ret = drmCommandWriteRead(bo->drv->fd, DRM_VC4_MMAP_BO, &bo_map, sizeof(bo_map));
  74         if (ret) {
  75                 fprintf(stderr, "drv: DRM_VC4_MMAP_BO failed\n");
  76                 return MAP_FAILED;
  77         }
  78
  79         data->length = bo->total_size;
  80         return mmap(0, bo->total_size, drv_get_prot(map_flags), MAP_SHARED, bo->drv->fd,
  81                     bo_map.offset);
  82 }
  83
  84 struct backend backend_vc4 = {
  85         .name = "vc4",
  86         .init = vc4_init,
  87         .bo_create = vc4_bo_create,
  88         .bo_import = drv_prime_bo_import,
  89         .bo_destroy = drv_gem_bo_destroy,
  90         .bo_map = vc4_bo_map,
  91         .bo_unmap = drv_bo_munmap,
  92 };
  93
  94 #endif