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_obj: 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_obj       *exynos_gem_obj[MAX_FB_BUFFER];
  40 };
  41
  42 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
  43                                 struct exynos_drm_gem_obj *exynos_gem_obj)
  44 {
  45         unsigned int flags;
  46
  47         /*
  48          * if exynos drm driver supports iommu then framebuffer can use
  49          * all the buffer types.
  50          */
  51         if (is_drm_iommu_supported(drm_dev))
  52                 return 0;
  53
  54         flags = exynos_gem_obj->flags;
  55
  56         /*
  57          * without iommu support, not support physically non-continuous memory
  58          * for framebuffer.
  59          */
  60         if (IS_NONCONTIG_BUFFER(flags)) {
  61                 DRM_ERROR("cannot use this gem memory type for fb.\n");
  62                 return -EINVAL;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
  69 {
  70         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  71         unsigned int i;
  72
  73         /* make sure that overlay data are updated before relesing fb. */
  74         exynos_drm_crtc_complete_scanout(fb);
  75
  76         drm_framebuffer_cleanup(fb);
  77
  78         for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
  79                 struct drm_gem_object *obj;
  80
  81                 if (exynos_fb->exynos_gem_obj[i] == NULL)
  82                         continue;
  83
  84                 obj = &exynos_fb->exynos_gem_obj[i]->base;
  85                 drm_gem_object_unreference_unlocked(obj);
  86         }
  87
  88         kfree(exynos_fb);
  89         exynos_fb = NULL;
  90 }
  91
  92 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
  93                                         struct drm_file *file_priv,
  94                                         unsigned int *handle)
  95 {
  96         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  97
  98         return drm_gem_handle_create(file_priv,
  99                         &exynos_fb->exynos_gem_obj[0]->base, handle);
 100 }
 101
 102 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
 103                                 struct drm_file *file_priv, unsigned flags,
 104                                 unsigned color, struct drm_clip_rect *clips,
 105                                 unsigned num_clips)
 106 {
 107         /* TODO */
 108
 109         return 0;
 110 }
 111
 112 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 113         .destroy        = exynos_drm_fb_destroy,
 114         .create_handle  = exynos_drm_fb_create_handle,
 115         .dirty          = exynos_drm_fb_dirty,
 116 };
 117
 118 struct drm_framebuffer *
 119 exynos_drm_framebuffer_init(struct drm_device *dev,
 120                             struct drm_mode_fb_cmd2 *mode_cmd,
 121                             struct exynos_drm_gem_obj **gem_obj,
 122                             int count)
 123 {
 124         struct exynos_drm_fb *exynos_fb;
 125         int i;
 126         int ret;
 127
 128         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 129         if (!exynos_fb)
 130                 return ERR_PTR(-ENOMEM);
 131
 132         for (i = 0; i < count; i++) {
 133                 ret = check_fb_gem_memory_type(dev, gem_obj[i]);
 134                 if (ret < 0)
 135                         goto err;
 136
 137                 exynos_fb->exynos_gem_obj[i] = gem_obj[i];
 138         }
 139
 140         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 141
 142         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 143         if (ret < 0) {
 144                 DRM_ERROR("failed to initialize framebuffer\n");
 145                 goto err;
 146         }
 147
 148         return &exynos_fb->fb;
 149
 150 err:
 151         kfree(exynos_fb);
 152         return ERR_PTR(ret);
 153 }
 154
 155 static struct drm_framebuffer *
 156 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 157                       struct drm_mode_fb_cmd2 *mode_cmd)
 158 {
 159         struct exynos_drm_gem_obj *gem_objs[MAX_FB_BUFFER];
 160         struct drm_gem_object *obj;
 161         struct drm_framebuffer *fb;
 162         int i;
 163         int ret;
 164
 165         for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
 166                 obj = drm_gem_object_lookup(dev, file_priv,
 167                                             mode_cmd->handles[i]);
 168                 if (!obj) {
 169                         DRM_ERROR("failed to lookup gem object\n");
 170                         ret = -ENOENT;
 171                         goto err;
 172                 }
 173
 174                 gem_objs[i] = to_exynos_gem_obj(obj);
 175         }
 176
 177         fb = exynos_drm_framebuffer_init(dev, mode_cmd, gem_objs, i);
 178         if (IS_ERR(fb)) {
 179                 ret = PTR_ERR(fb);
 180                 goto err;
 181         }
 182
 183         return fb;
 184
 185 err:
 186         while (i--)
 187                 drm_gem_object_unreference_unlocked(&gem_objs[i]->base);
 188
 189         return ERR_PTR(ret);
 190 }
 191
 192 struct exynos_drm_gem_obj *exynos_drm_fb_gem_obj(struct drm_framebuffer *fb,
 193                                                  int index)
 194 {
 195         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 196         struct exynos_drm_gem_obj *obj;
 197
 198         if (index >= MAX_FB_BUFFER)
 199                 return NULL;
 200
 201         obj = exynos_fb->exynos_gem_obj[index];
 202         if (!obj)
 203                 return NULL;
 204
 205         DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)obj->dma_addr);
 206
 207         return obj;
 208 }
 209
 210 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 211 {
 212         struct exynos_drm_private *private = dev->dev_private;
 213         struct drm_fb_helper *fb_helper = private->fb_helper;
 214
 215         if (fb_helper)
 216                 drm_fb_helper_hotplug_event(fb_helper);
 217         else
 218                 exynos_drm_fbdev_init(dev);
 219 }
 220
 221 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 222         .fb_create = exynos_user_fb_create,
 223         .output_poll_changed = exynos_drm_output_poll_changed,
 224         .atomic_check = drm_atomic_helper_check,
 225         .atomic_commit = exynos_atomic_commit,
 226 };
 227
 228 void exynos_drm_mode_config_init(struct drm_device *dev)
 229 {
 230         dev->mode_config.min_width = 0;
 231         dev->mode_config.min_height = 0;
 232
 233         /*
 234          * set max width and height as default value(4096x4096).
 235          * this value would be used to check framebuffer size limitation
 236          * at drm_mode_addfb().
 237          */
 238         dev->mode_config.max_width = 4096;
 239         dev->mode_config.max_height = 4096;
 240
 241         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 242 }