drivers/gpu/drm/exynos/exynos_drm_fb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* exynos_drm_fb.c
   3  *
   4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   5  * Authors:
   6  *      Inki Dae <inki.dae@samsung.com>
   7  *      Joonyoung Shim <jy0922.shim@samsung.com>
   8  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   9  */
  10
  11 #include <drm/drm_atomic.h>
  12 #include <drm/drm_atomic_helper.h>
  13 #include <drm/drm_crtc.h>
  14 #include <drm/drm_framebuffer.h>
  15 #include <drm/drm_fourcc.h>
  16 #include <drm/drm_gem_framebuffer_helper.h>
  17 #include <drm/drm_probe_helper.h>
  18 #include <drm/exynos_drm.h>
  19
  20 #include "exynos_drm_crtc.h"
  21 #include "exynos_drm_drv.h"
  22 #include "exynos_drm_fb.h"
  23 #include "exynos_drm_fbdev.h"
  24
  25 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
  26                                     struct exynos_drm_gem *exynos_gem)
  27 {
  28         unsigned int flags;
  29
  30         /*
  31          * if exynos drm driver supports iommu then framebuffer can use
  32          * all the buffer types.
  33          */
  34         if (is_drm_iommu_supported(drm_dev))
  35                 return 0;
  36
  37         flags = exynos_gem->flags;
  38
  39         /*
  40          * Physically non-contiguous memory type for framebuffer is not
  41          * supported without IOMMU.
  42          */
  43         if (IS_NONCONTIG_BUFFER(flags)) {
  44                 DRM_DEV_ERROR(drm_dev->dev,
  45                               "Non-contiguous GEM memory is not supported.\n");
  46                 return -EINVAL;
  47         }
  48
  49         return 0;
  50 }
  51
  52 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
  53         .destroy        = drm_gem_fb_destroy,
  54         .create_handle  = drm_gem_fb_create_handle,
  55 };
  56
  57 struct drm_framebuffer *
  58 exynos_drm_framebuffer_init(struct drm_device *dev,
  59                             const struct drm_mode_fb_cmd2 *mode_cmd,
  60                             struct exynos_drm_gem **exynos_gem,
  61                             int count)
  62 {
  63         struct drm_framebuffer *fb;
  64         int i;
  65         int ret;
  66
  67         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
  68         if (!fb)
  69                 return ERR_PTR(-ENOMEM);
  70
  71         for (i = 0; i < count; i++) {
  72                 ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
  73                 if (ret < 0)
  74                         goto err;
  75
  76                 fb->obj[i] = &exynos_gem[i]->base;
  77         }
  78
  79         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
  80
  81         ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
  82         if (ret < 0) {
  83                 DRM_DEV_ERROR(dev->dev,
  84                               "failed to initialize framebuffer\n");
  85                 goto err;
  86         }
  87
  88         return fb;
  89
  90 err:
  91         kfree(fb);
  92         return ERR_PTR(ret);
  93 }
  94
  95 static struct drm_framebuffer *
  96 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
  97                       const struct drm_mode_fb_cmd2 *mode_cmd)
  98 {
  99         const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd);
 100         struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
 101         struct drm_framebuffer *fb;
 102         int i;
 103         int ret;
 104
 105         for (i = 0; i < info->num_planes; i++) {
 106                 unsigned int height = (i == 0) ? mode_cmd->height :
 107                                      DIV_ROUND_UP(mode_cmd->height, info->vsub);
 108                 unsigned long size = height * mode_cmd->pitches[i] +
 109                                      mode_cmd->offsets[i];
 110
 111                 exynos_gem[i] = exynos_drm_gem_get(file_priv,
 112                                                    mode_cmd->handles[i]);
 113                 if (!exynos_gem[i]) {
 114                         DRM_DEV_ERROR(dev->dev,
 115                                       "failed to lookup gem object\n");
 116                         ret = -ENOENT;
 117                         goto err;
 118                 }
 119
 120                 if (size > exynos_gem[i]->size) {
 121                         i++;
 122                         ret = -EINVAL;
 123                         goto err;
 124                 }
 125         }
 126
 127         fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
 128         if (IS_ERR(fb)) {
 129                 ret = PTR_ERR(fb);
 130                 goto err;
 131         }
 132
 133         return fb;
 134
 135 err:
 136         while (i--)
 137                 exynos_drm_gem_put(exynos_gem[i]);
 138
 139         return ERR_PTR(ret);
 140 }
 141
 142 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
 143 {
 144         struct exynos_drm_gem *exynos_gem;
 145
 146         if (WARN_ON_ONCE(index >= MAX_FB_BUFFER))
 147                 return 0;
 148
 149         exynos_gem = to_exynos_gem(fb->obj[index]);
 150         return exynos_gem->dma_addr + fb->offsets[index];
 151 }
 152
 153 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
 154         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
 155 };
 156
 157 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 158         .fb_create = exynos_user_fb_create,
 159         .atomic_check = drm_atomic_helper_check,
 160         .atomic_commit = drm_atomic_helper_commit,
 161 };
 162
 163 void exynos_drm_mode_config_init(struct drm_device *dev)
 164 {
 165         dev->mode_config.min_width = 0;
 166         dev->mode_config.min_height = 0;
 167
 168         /*
 169          * set max width and height as default value(4096x4096).
 170          * this value would be used to check framebuffer size limitation
 171          * at drm_mode_addfb().
 172          */
 173         dev->mode_config.max_width = 4096;
 174         dev->mode_config.max_height = 4096;
 175
 176         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 177         dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;
 178
 179         dev->mode_config.normalize_zpos = true;
 180 }