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