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 <uapi/drm/exynos_drm.h>
  22
  23 #include "exynos_drm_drv.h"
  24 #include "exynos_drm_fb.h"
  25 #include "exynos_drm_fbdev.h"
  26 #include "exynos_drm_iommu.h"
  27 #include "exynos_drm_crtc.h"
  28
  29 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  30
  31 /*
  32  * exynos specific framebuffer structure.
  33  *
  34  * @fb: drm framebuffer obejct.
  35  * @exynos_gem: array of exynos specific gem object containing a gem object.
  36  */
  37 struct exynos_drm_fb {
  38         struct drm_framebuffer  fb;
  39         struct exynos_drm_gem   *exynos_gem[MAX_FB_BUFFER];
  40         dma_addr_t                      dma_addr[MAX_FB_BUFFER];
  41 };
  42
  43 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
  44                                     struct exynos_drm_gem *exynos_gem)
  45 {
  46         unsigned int flags;
  47
  48         /*
  49          * if exynos drm driver supports iommu then framebuffer can use
  50          * all the buffer types.
  51          */
  52         if (is_drm_iommu_supported(drm_dev))
  53                 return 0;
  54
  55         flags = exynos_gem->flags;
  56
  57         /*
  58          * Physically non-contiguous memory type for framebuffer is not
  59          * supported without IOMMU.
  60          */
  61         if (IS_NONCONTIG_BUFFER(flags)) {
  62                 DRM_ERROR("Non-contiguous GEM memory is not supported.\n");
  63                 return -EINVAL;
  64         }
  65
  66         return 0;
  67 }
  68
  69 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
  70 {
  71         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  72         unsigned int i;
  73
  74         drm_framebuffer_cleanup(fb);
  75
  76         for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem); i++) {
  77                 struct drm_gem_object *obj;
  78
  79                 if (exynos_fb->exynos_gem[i] == NULL)
  80                         continue;
  81
  82                 obj = &exynos_fb->exynos_gem[i]->base;
  83                 drm_gem_object_unreference_unlocked(obj);
  84         }
  85
  86         kfree(exynos_fb);
  87         exynos_fb = NULL;
  88 }
  89
  90 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
  91                                         struct drm_file *file_priv,
  92                                         unsigned int *handle)
  93 {
  94         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  95
  96         return drm_gem_handle_create(file_priv,
  97                                      &exynos_fb->exynos_gem[0]->base, handle);
  98 }
  99
 100 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 101         .destroy        = exynos_drm_fb_destroy,
 102         .create_handle  = exynos_drm_fb_create_handle,
 103 };
 104
 105 struct drm_framebuffer *
 106 exynos_drm_framebuffer_init(struct drm_device *dev,
 107                             const struct drm_mode_fb_cmd2 *mode_cmd,
 108                             struct exynos_drm_gem **exynos_gem,
 109                             int count)
 110 {
 111         struct exynos_drm_fb *exynos_fb;
 112         int i;
 113         int ret;
 114
 115         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 116         if (!exynos_fb)
 117                 return ERR_PTR(-ENOMEM);
 118
 119         for (i = 0; i < count; i++) {
 120                 ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
 121                 if (ret < 0)
 122                         goto err;
 123
 124                 exynos_fb->exynos_gem[i] = exynos_gem[i];
 125                 exynos_fb->dma_addr[i] = exynos_gem[i]->dma_addr
 126                                                 + mode_cmd->offsets[i];
 127         }
 128
 129         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 130
 131         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 132         if (ret < 0) {
 133                 DRM_ERROR("failed to initialize framebuffer\n");
 134                 goto err;
 135         }
 136
 137         return &exynos_fb->fb;
 138
 139 err:
 140         kfree(exynos_fb);
 141         return ERR_PTR(ret);
 142 }
 143
 144 static struct drm_framebuffer *
 145 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 146                       const struct drm_mode_fb_cmd2 *mode_cmd)
 147 {
 148         struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
 149         struct drm_gem_object *obj;
 150         struct drm_framebuffer *fb;
 151         int i;
 152         int ret;
 153
 154         for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
 155                 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
 156                 if (!obj) {
 157                         DRM_ERROR("failed to lookup gem object\n");
 158                         ret = -ENOENT;
 159                         goto err;
 160                 }
 161
 162                 exynos_gem[i] = to_exynos_gem(obj);
 163         }
 164
 165         fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
 166         if (IS_ERR(fb)) {
 167                 ret = PTR_ERR(fb);
 168                 goto err;
 169         }
 170
 171         return fb;
 172
 173 err:
 174         while (i--)
 175                 drm_gem_object_unreference_unlocked(&exynos_gem[i]->base);
 176
 177         return ERR_PTR(ret);
 178 }
 179
 180 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
 181 {
 182         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 183
 184         if (index >= MAX_FB_BUFFER)
 185                 return DMA_ERROR_CODE;
 186
 187         return exynos_fb->dma_addr[index];
 188 }
 189
 190 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 191         .fb_create = exynos_user_fb_create,
 192         .output_poll_changed = exynos_drm_output_poll_changed,
 193         .atomic_check = exynos_atomic_check,
 194         .atomic_commit = exynos_atomic_commit,
 195 };
 196
 197 void exynos_drm_mode_config_init(struct drm_device *dev)
 198 {
 199         dev->mode_config.min_width = 0;
 200         dev->mode_config.min_height = 0;
 201
 202         /*
 203          * set max width and height as default value(4096x4096).
 204          * this value would be used to check framebuffer size limitation
 205          * at drm_mode_addfb().
 206          */
 207         dev->mode_config.max_width = 4096;
 208         dev->mode_config.max_height = 4096;
 209
 210         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 211 }