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 <uapi/drm/exynos_drm.h>
  20
  21 #include "exynos_drm_drv.h"
  22 #include "exynos_drm_fb.h"
  23 #include "exynos_drm_fbdev.h"
  24 #include "exynos_drm_gem.h"
  25 #include "exynos_drm_iommu.h"
  26 #include "exynos_drm_crtc.h"
  27
  28 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  29
  30 /*
  31  * exynos specific framebuffer structure.
  32  *
  33  * @fb: drm framebuffer obejct.
  34  * @buf_cnt: a buffer count to drm framebuffer.
  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         unsigned int                    buf_cnt;
  40         struct exynos_drm_gem_obj       *exynos_gem_obj[MAX_FB_BUFFER];
  41 };
  42
  43 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
  44                                 struct exynos_drm_gem_obj *exynos_gem_obj)
  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_obj->flags;
  56
  57         /*
  58          * without iommu support, not support physically non-continuous memory
  59          * for framebuffer.
  60          */
  61         if (IS_NONCONTIG_BUFFER(flags)) {
  62                 DRM_ERROR("cannot use this gem memory type for fb.\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         /* make sure that overlay data are updated before relesing fb. */
  75         exynos_drm_crtc_complete_scanout(fb);
  76
  77         drm_framebuffer_cleanup(fb);
  78
  79         for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
  80                 struct drm_gem_object *obj;
  81
  82                 if (exynos_fb->exynos_gem_obj[i] == NULL)
  83                         continue;
  84
  85                 obj = &exynos_fb->exynos_gem_obj[i]->base;
  86                 drm_gem_object_unreference_unlocked(obj);
  87         }
  88
  89         kfree(exynos_fb);
  90         exynos_fb = NULL;
  91 }
  92
  93 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
  94                                         struct drm_file *file_priv,
  95                                         unsigned int *handle)
  96 {
  97         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  98
  99         /* This fb should have only one gem object. */
 100         if (WARN_ON(exynos_fb->buf_cnt != 1))
 101                 return -EINVAL;
 102
 103         return drm_gem_handle_create(file_priv,
 104                         &exynos_fb->exynos_gem_obj[0]->base, handle);
 105 }
 106
 107 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
 108                                 struct drm_file *file_priv, unsigned flags,
 109                                 unsigned color, struct drm_clip_rect *clips,
 110                                 unsigned num_clips)
 111 {
 112         /* TODO */
 113
 114         return 0;
 115 }
 116
 117 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 118         .destroy        = exynos_drm_fb_destroy,
 119         .create_handle  = exynos_drm_fb_create_handle,
 120         .dirty          = exynos_drm_fb_dirty,
 121 };
 122
 123 void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
 124                                                 unsigned int cnt)
 125 {
 126         struct exynos_drm_fb *exynos_fb;
 127
 128         exynos_fb = to_exynos_fb(fb);
 129
 130         exynos_fb->buf_cnt = cnt;
 131 }
 132
 133 unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
 134 {
 135         struct exynos_drm_fb *exynos_fb;
 136
 137         exynos_fb = to_exynos_fb(fb);
 138
 139         return exynos_fb->buf_cnt;
 140 }
 141
 142 struct drm_framebuffer *
 143 exynos_drm_framebuffer_init(struct drm_device *dev,
 144                             struct drm_mode_fb_cmd2 *mode_cmd,
 145                             struct drm_gem_object *obj)
 146 {
 147         struct exynos_drm_fb *exynos_fb;
 148         struct exynos_drm_gem_obj *exynos_gem_obj;
 149         int ret;
 150
 151         exynos_gem_obj = to_exynos_gem_obj(obj);
 152
 153         ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 154         if (ret < 0)
 155                 return ERR_PTR(ret);
 156
 157         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 158         if (!exynos_fb)
 159                 return ERR_PTR(-ENOMEM);
 160
 161         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 162         exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
 163
 164         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 165         if (ret) {
 166                 kfree(exynos_fb);
 167                 DRM_ERROR("failed to initialize framebuffer\n");
 168                 return ERR_PTR(ret);
 169         }
 170
 171         return &exynos_fb->fb;
 172 }
 173
 174 static struct drm_framebuffer *
 175 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 176                       struct drm_mode_fb_cmd2 *mode_cmd)
 177 {
 178         struct drm_gem_object *obj;
 179         struct exynos_drm_gem_obj *exynos_gem_obj;
 180         struct exynos_drm_fb *exynos_fb;
 181         int i, ret;
 182
 183         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 184         if (!exynos_fb)
 185                 return ERR_PTR(-ENOMEM);
 186
 187         obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
 188         if (!obj) {
 189                 DRM_ERROR("failed to lookup gem object\n");
 190                 ret = -ENOENT;
 191                 goto err_free;
 192         }
 193
 194         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 195         exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj);
 196         exynos_fb->buf_cnt = drm_format_num_planes(mode_cmd->pixel_format);
 197
 198         DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
 199
 200         for (i = 1; i < exynos_fb->buf_cnt; i++) {
 201                 obj = drm_gem_object_lookup(dev, file_priv,
 202                                 mode_cmd->handles[i]);
 203                 if (!obj) {
 204                         DRM_ERROR("failed to lookup gem object\n");
 205                         ret = -ENOENT;
 206                         exynos_fb->buf_cnt = i;
 207                         goto err_unreference;
 208                 }
 209
 210                 exynos_gem_obj = to_exynos_gem_obj(obj);
 211                 exynos_fb->exynos_gem_obj[i] = exynos_gem_obj;
 212
 213                 ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 214                 if (ret < 0)
 215                         goto err_unreference;
 216         }
 217
 218         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 219         if (ret) {
 220                 DRM_ERROR("failed to init framebuffer.\n");
 221                 goto err_unreference;
 222         }
 223
 224         return &exynos_fb->fb;
 225
 226 err_unreference:
 227         for (i = 0; i < exynos_fb->buf_cnt; i++) {
 228                 struct drm_gem_object *obj;
 229
 230                 obj = &exynos_fb->exynos_gem_obj[i]->base;
 231                 if (obj)
 232                         drm_gem_object_unreference_unlocked(obj);
 233         }
 234 err_free:
 235         kfree(exynos_fb);
 236         return ERR_PTR(ret);
 237 }
 238
 239 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
 240                                                 int index)
 241 {
 242         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 243         struct exynos_drm_gem_buf *buffer;
 244
 245         if (index >= MAX_FB_BUFFER)
 246                 return NULL;
 247
 248         buffer = exynos_fb->exynos_gem_obj[index]->buffer;
 249         if (!buffer)
 250                 return NULL;
 251
 252         DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr);
 253
 254         return buffer;
 255 }
 256
 257 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 258 {
 259         struct exynos_drm_private *private = dev->dev_private;
 260         struct drm_fb_helper *fb_helper = private->fb_helper;
 261
 262         if (fb_helper)
 263                 drm_fb_helper_hotplug_event(fb_helper);
 264         else
 265                 exynos_drm_fbdev_init(dev);
 266 }
 267
 268 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 269         .fb_create = exynos_user_fb_create,
 270         .output_poll_changed = exynos_drm_output_poll_changed,
 271 };
 272
 273 void exynos_drm_mode_config_init(struct drm_device *dev)
 274 {
 275         dev->mode_config.min_width = 0;
 276         dev->mode_config.min_height = 0;
 277
 278         /*
 279          * set max width and height as default value(4096x4096).
 280          * this value would be used to check framebuffer size limitation
 281          * at drm_mode_addfb().
 282          */
 283         dev->mode_config.max_width = 4096;
 284         dev->mode_config.max_height = 4096;
 285
 286         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 287 }