drivers/gpu/drm/exynos/exynos_drm_fb.c

   1 /* exynos_drm_fb.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_crtc.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_fb_helper.h>
  19 #include <drm/drm_atomic.h>
  20 #include <drm/drm_atomic_helper.h>
  21 #include <drm/drm_gem_framebuffer_helper.h>
  22 #include <uapi/drm/exynos_drm.h>
  23
  24 #include "exynos_drm_drv.h"
  25 #include "exynos_drm_fb.h"
  26 #include "exynos_drm_fbdev.h"
  27 #include "exynos_drm_iommu.h"
  28 #include "exynos_drm_crtc.h"
  29
  30 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
  31                                     struct exynos_drm_gem *exynos_gem)
  32 {
  33         unsigned int flags;
  34
  35         /*
  36          * if exynos drm driver supports iommu then framebuffer can use
  37          * all the buffer types.
  38          */
  39         if (is_drm_iommu_supported(drm_dev))
  40                 return 0;
  41
  42         flags = exynos_gem->flags;
  43
  44         /*
  45          * Physically non-contiguous memory type for framebuffer is not
  46          * supported without IOMMU.
  47          */
  48         if (IS_NONCONTIG_BUFFER(flags)) {
  49                 DRM_ERROR("Non-contiguous GEM memory is not supported.\n");
  50                 return -EINVAL;
  51         }
  52
  53         return 0;
  54 }
  55
  56 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
  57         .destroy        = drm_gem_fb_destroy,
  58         .create_handle  = drm_gem_fb_create_handle,
  59 };
  60
  61 struct drm_framebuffer *
  62 exynos_drm_framebuffer_init(struct drm_device *dev,
  63                             const struct drm_mode_fb_cmd2 *mode_cmd,
  64                             struct exynos_drm_gem **exynos_gem,
  65                             int count)
  66 {
  67         struct drm_framebuffer *fb;
  68         int i;
  69         int ret;
  70
  71         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
  72         if (!fb)
  73                 return ERR_PTR(-ENOMEM);
  74
  75         for (i = 0; i < count; i++) {
  76                 ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
  77                 if (ret < 0)
  78                         goto err;
  79
  80                 fb->obj[i] = &exynos_gem[i]->base;
  81         }
  82
  83         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
  84
  85         ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
  86         if (ret < 0) {
  87                 DRM_ERROR("failed to initialize framebuffer\n");
  88                 goto err;
  89         }
  90
  91         return fb;
  92
  93 err:
  94         kfree(fb);
  95         return ERR_PTR(ret);
  96 }
  97
  98 static struct drm_framebuffer *
  99 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 100                       const struct drm_mode_fb_cmd2 *mode_cmd)
 101 {
 102         const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd);
 103         struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
 104         struct drm_framebuffer *fb;
 105         int i;
 106         int ret;
 107
 108         for (i = 0; i < info->num_planes; i++) {
 109                 unsigned int height = (i == 0) ? mode_cmd->height :
 110                                      DIV_ROUND_UP(mode_cmd->height, info->vsub);
 111                 unsigned long size = height * mode_cmd->pitches[i] +
 112                                      mode_cmd->offsets[i];
 113
 114                 exynos_gem[i] = exynos_drm_gem_get(file_priv,
 115                                                    mode_cmd->handles[i]);
 116                 if (!exynos_gem[i]) {
 117                         DRM_ERROR("failed to lookup gem object\n");
 118                         ret = -ENOENT;
 119                         goto err;
 120                 }
 121
 122                 if (size > exynos_gem[i]->size) {
 123                         i++;
 124                         ret = -EINVAL;
 125                         goto err;
 126                 }
 127         }
 128
 129         fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
 130         if (IS_ERR(fb)) {
 131                 ret = PTR_ERR(fb);
 132                 goto err;
 133         }
 134
 135         return fb;
 136
 137 err:
 138         while (i--)
 139                 exynos_drm_gem_put(exynos_gem[i]);
 140
 141         return ERR_PTR(ret);
 142 }
 143
 144 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
 145 {
 146         struct exynos_drm_gem *exynos_gem;
 147
 148         if (WARN_ON_ONCE(index >= MAX_FB_BUFFER))
 149                 return 0;
 150
 151         exynos_gem = to_exynos_gem(fb->obj[index]);
 152         return exynos_gem->dma_addr + fb->offsets[index];
 153 }
 154
 155 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
 156         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
 157 };
 158
 159 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 160         .fb_create = exynos_user_fb_create,
 161         .output_poll_changed = drm_fb_helper_output_poll_changed,
 162         .atomic_check = drm_atomic_helper_check,
 163         .atomic_commit = drm_atomic_helper_commit,
 164 };
 165
 166 void exynos_drm_mode_config_init(struct drm_device *dev)
 167 {
 168         dev->mode_config.min_width = 0;
 169         dev->mode_config.min_height = 0;
 170
 171         /*
 172          * set max width and height as default value(4096x4096).
 173          * this value would be used to check framebuffer size limitation
 174          * at drm_mode_addfb().
 175          */
 176         dev->mode_config.max_width = 4096;
 177         dev->mode_config.max_height = 4096;
 178
 179         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 180         dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;
 181
 182         dev->mode_config.allow_fb_modifiers = true;
 183
 184         dev->mode_config.normalize_zpos = true;
 185 }