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_gem.h"
  24 #include "exynos_drm_iommu.h"
  25 #include "exynos_drm_encoder.h"
  26
  27 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  28
  29 /*
  30  * exynos specific framebuffer structure.
  31  *
  32  * @fb: drm framebuffer obejct.
  33  * @buf_cnt: a buffer count to drm framebuffer.
  34  * @exynos_gem_obj: array of exynos specific gem object containing a gem object.
  35  */
  36 struct exynos_drm_fb {
  37         struct drm_framebuffer          fb;
  38         unsigned int                    buf_cnt;
  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         DRM_DEBUG_KMS("%s\n", __FILE__);
  74
  75         /* make sure that overlay data are updated before relesing fb. */
  76         exynos_drm_encoder_complete_scanout(fb);
  77
  78         drm_framebuffer_cleanup(fb);
  79
  80         for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
  81                 struct drm_gem_object *obj;
  82
  83                 if (exynos_fb->exynos_gem_obj[i] == NULL)
  84                         continue;
  85
  86                 obj = &exynos_fb->exynos_gem_obj[i]->base;
  87                 drm_gem_object_unreference_unlocked(obj);
  88         }
  89
  90         kfree(exynos_fb);
  91         exynos_fb = NULL;
  92 }
  93
  94 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
  95                                         struct drm_file *file_priv,
  96                                         unsigned int *handle)
  97 {
  98         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  99
 100         DRM_DEBUG_KMS("%s\n", __FILE__);
 101
 102         /* This fb should have only one gem object. */
 103         if (WARN_ON(exynos_fb->buf_cnt != 1))
 104                 return -EINVAL;
 105
 106         return drm_gem_handle_create(file_priv,
 107                         &exynos_fb->exynos_gem_obj[0]->base, handle);
 108 }
 109
 110 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
 111                                 struct drm_file *file_priv, unsigned flags,
 112                                 unsigned color, struct drm_clip_rect *clips,
 113                                 unsigned num_clips)
 114 {
 115         DRM_DEBUG_KMS("%s\n", __FILE__);
 116
 117         /* TODO */
 118
 119         return 0;
 120 }
 121
 122 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 123         .destroy        = exynos_drm_fb_destroy,
 124         .create_handle  = exynos_drm_fb_create_handle,
 125         .dirty          = exynos_drm_fb_dirty,
 126 };
 127
 128 void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
 129                                                 unsigned int cnt)
 130 {
 131         struct exynos_drm_fb *exynos_fb;
 132
 133         exynos_fb = to_exynos_fb(fb);
 134
 135         exynos_fb->buf_cnt = cnt;
 136 }
 137
 138 unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
 139 {
 140         struct exynos_drm_fb *exynos_fb;
 141
 142         exynos_fb = to_exynos_fb(fb);
 143
 144         return exynos_fb->buf_cnt;
 145 }
 146
 147 struct drm_framebuffer *
 148 exynos_drm_framebuffer_init(struct drm_device *dev,
 149                             struct drm_mode_fb_cmd2 *mode_cmd,
 150                             struct drm_gem_object *obj)
 151 {
 152         struct exynos_drm_fb *exynos_fb;
 153         struct exynos_drm_gem_obj *exynos_gem_obj;
 154         int ret;
 155
 156         exynos_gem_obj = to_exynos_gem_obj(obj);
 157
 158         ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 159         if (ret < 0) {
 160                 DRM_ERROR("cannot use this gem memory type for fb.\n");
 161                 return ERR_PTR(-EINVAL);
 162         }
 163
 164         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 165         if (!exynos_fb) {
 166                 DRM_ERROR("failed to allocate exynos drm framebuffer\n");
 167                 return ERR_PTR(-ENOMEM);
 168         }
 169
 170         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 171         exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
 172
 173         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 174         if (ret) {
 175                 DRM_ERROR("failed to initialize framebuffer\n");
 176                 return ERR_PTR(ret);
 177         }
 178
 179         return &exynos_fb->fb;
 180 }
 181
 182 static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd)
 183 {
 184         unsigned int cnt = 0;
 185
 186         if (mode_cmd->pixel_format != DRM_FORMAT_NV12)
 187                 return drm_format_num_planes(mode_cmd->pixel_format);
 188
 189         while (cnt != MAX_FB_BUFFER) {
 190                 if (!mode_cmd->handles[cnt])
 191                         break;
 192                 cnt++;
 193         }
 194
 195         /*
 196          * check if NV12 or NV12M.
 197          *
 198          * NV12
 199          * handles[0] = base1, offsets[0] = 0
 200          * handles[1] = base1, offsets[1] = Y_size
 201          *
 202          * NV12M
 203          * handles[0] = base1, offsets[0] = 0
 204          * handles[1] = base2, offsets[1] = 0
 205          */
 206         if (cnt == 2) {
 207                 /*
 208                  * in case of NV12 format, offsets[1] is not 0 and
 209                  * handles[0] is same as handles[1].
 210                  */
 211                 if (mode_cmd->offsets[1] &&
 212                         mode_cmd->handles[0] == mode_cmd->handles[1])
 213                         cnt = 1;
 214         }
 215
 216         return cnt;
 217 }
 218
 219 static struct drm_framebuffer *
 220 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 221                       struct drm_mode_fb_cmd2 *mode_cmd)
 222 {
 223         struct drm_gem_object *obj;
 224         struct exynos_drm_gem_obj *exynos_gem_obj;
 225         struct exynos_drm_fb *exynos_fb;
 226         int i, ret;
 227
 228         DRM_DEBUG_KMS("%s\n", __FILE__);
 229
 230         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 231         if (!exynos_fb) {
 232                 DRM_ERROR("failed to allocate exynos drm framebuffer\n");
 233                 return ERR_PTR(-ENOMEM);
 234         }
 235
 236         obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
 237         if (!obj) {
 238                 DRM_ERROR("failed to lookup gem object\n");
 239                 ret = -ENOENT;
 240                 goto err_free;
 241         }
 242
 243         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 244         exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj);
 245         exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd);
 246
 247         DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
 248
 249         for (i = 1; i < exynos_fb->buf_cnt; i++) {
 250                 obj = drm_gem_object_lookup(dev, file_priv,
 251                                 mode_cmd->handles[i]);
 252                 if (!obj) {
 253                         DRM_ERROR("failed to lookup gem object\n");
 254                         ret = -ENOENT;
 255                         exynos_fb->buf_cnt = i;
 256                         goto err_unreference;
 257                 }
 258
 259                 exynos_gem_obj = to_exynos_gem_obj(obj);
 260                 exynos_fb->exynos_gem_obj[i] = exynos_gem_obj;
 261
 262                 ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 263                 if (ret < 0) {
 264                         DRM_ERROR("cannot use this gem memory type for fb.\n");
 265                         goto err_unreference;
 266                 }
 267         }
 268
 269         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 270         if (ret) {
 271                 DRM_ERROR("failed to init framebuffer.\n");
 272                 goto err_unreference;
 273         }
 274
 275         return &exynos_fb->fb;
 276
 277 err_unreference:
 278         for (i = 0; i < exynos_fb->buf_cnt; i++) {
 279                 struct drm_gem_object *obj;
 280
 281                 obj = &exynos_fb->exynos_gem_obj[i]->base;
 282                 if (obj)
 283                         drm_gem_object_unreference_unlocked(obj);
 284         }
 285 err_free:
 286         kfree(exynos_fb);
 287         return ERR_PTR(ret);
 288 }
 289
 290 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
 291                                                 int index)
 292 {
 293         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 294         struct exynos_drm_gem_buf *buffer;
 295
 296         DRM_DEBUG_KMS("%s\n", __FILE__);
 297
 298         if (index >= MAX_FB_BUFFER)
 299                 return NULL;
 300
 301         buffer = exynos_fb->exynos_gem_obj[index]->buffer;
 302         if (!buffer)
 303                 return NULL;
 304
 305         DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr);
 306
 307         return buffer;
 308 }
 309
 310 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 311 {
 312         struct exynos_drm_private *private = dev->dev_private;
 313         struct drm_fb_helper *fb_helper = private->fb_helper;
 314
 315         if (fb_helper)
 316                 drm_fb_helper_hotplug_event(fb_helper);
 317 }
 318
 319 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 320         .fb_create = exynos_user_fb_create,
 321         .output_poll_changed = exynos_drm_output_poll_changed,
 322 };
 323
 324 void exynos_drm_mode_config_init(struct drm_device *dev)
 325 {
 326         dev->mode_config.min_width = 0;
 327         dev->mode_config.min_height = 0;
 328
 329         /*
 330          * set max width and height as default value(4096x4096).
 331          * this value would be used to check framebuffer size limitation
 332          * at drm_mode_addfb().
 333          */
 334         dev->mode_config.max_width = 4096;
 335         dev->mode_config.max_height = 4096;
 336
 337         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 338 }