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                 DRM_ERROR("cannot use this gem memory type for fb.\n");
 156                 return ERR_PTR(-EINVAL);
 157         }
 158
 159         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 160         if (!exynos_fb)
 161                 return ERR_PTR(-ENOMEM);
 162
 163         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 164         exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
 165
 166         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 167         if (ret) {
 168                 kfree(exynos_fb);
 169                 DRM_ERROR("failed to initialize framebuffer\n");
 170                 return ERR_PTR(ret);
 171         }
 172
 173         return &exynos_fb->fb;
 174 }
 175
 176 static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd)
 177 {
 178         unsigned int cnt = 0;
 179
 180         if (mode_cmd->pixel_format != DRM_FORMAT_NV12)
 181                 return drm_format_num_planes(mode_cmd->pixel_format);
 182
 183         while (cnt != MAX_FB_BUFFER) {
 184                 if (!mode_cmd->handles[cnt])
 185                         break;
 186                 cnt++;
 187         }
 188
 189         /*
 190          * check if NV12 or NV12M.
 191          *
 192          * NV12
 193          * handles[0] = base1, offsets[0] = 0
 194          * handles[1] = base1, offsets[1] = Y_size
 195          *
 196          * NV12M
 197          * handles[0] = base1, offsets[0] = 0
 198          * handles[1] = base2, offsets[1] = 0
 199          */
 200         if (cnt == 2) {
 201                 /*
 202                  * in case of NV12 format, offsets[1] is not 0 and
 203                  * handles[0] is same as handles[1].
 204                  */
 205                 if (mode_cmd->offsets[1] &&
 206                         mode_cmd->handles[0] == mode_cmd->handles[1])
 207                         cnt = 1;
 208         }
 209
 210         return cnt;
 211 }
 212
 213 static struct drm_framebuffer *
 214 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 215                       struct drm_mode_fb_cmd2 *mode_cmd)
 216 {
 217         struct drm_gem_object *obj;
 218         struct exynos_drm_gem_obj *exynos_gem_obj;
 219         struct exynos_drm_fb *exynos_fb;
 220         int i, ret;
 221
 222         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 223         if (!exynos_fb)
 224                 return ERR_PTR(-ENOMEM);
 225
 226         obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
 227         if (!obj) {
 228                 DRM_ERROR("failed to lookup gem object\n");
 229                 ret = -ENOENT;
 230                 goto err_free;
 231         }
 232
 233         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 234         exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj);
 235         exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd);
 236
 237         DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
 238
 239         for (i = 1; i < exynos_fb->buf_cnt; i++) {
 240                 obj = drm_gem_object_lookup(dev, file_priv,
 241                                 mode_cmd->handles[i]);
 242                 if (!obj) {
 243                         DRM_ERROR("failed to lookup gem object\n");
 244                         ret = -ENOENT;
 245                         exynos_fb->buf_cnt = i;
 246                         goto err_unreference;
 247                 }
 248
 249                 exynos_gem_obj = to_exynos_gem_obj(obj);
 250                 exynos_fb->exynos_gem_obj[i] = exynos_gem_obj;
 251
 252                 ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 253                 if (ret < 0) {
 254                         DRM_ERROR("cannot use this gem memory type for fb.\n");
 255                         goto err_unreference;
 256                 }
 257         }
 258
 259         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 260         if (ret) {
 261                 DRM_ERROR("failed to init framebuffer.\n");
 262                 goto err_unreference;
 263         }
 264
 265         return &exynos_fb->fb;
 266
 267 err_unreference:
 268         for (i = 0; i < exynos_fb->buf_cnt; i++) {
 269                 struct drm_gem_object *obj;
 270
 271                 obj = &exynos_fb->exynos_gem_obj[i]->base;
 272                 if (obj)
 273                         drm_gem_object_unreference_unlocked(obj);
 274         }
 275 err_free:
 276         kfree(exynos_fb);
 277         return ERR_PTR(ret);
 278 }
 279
 280 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
 281                                                 int index)
 282 {
 283         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 284         struct exynos_drm_gem_buf *buffer;
 285
 286         if (index >= MAX_FB_BUFFER)
 287                 return NULL;
 288
 289         buffer = exynos_fb->exynos_gem_obj[index]->buffer;
 290         if (!buffer)
 291                 return NULL;
 292
 293         DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr);
 294
 295         return buffer;
 296 }
 297
 298 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 299 {
 300         struct exynos_drm_private *private = dev->dev_private;
 301         struct drm_fb_helper *fb_helper = private->fb_helper;
 302
 303         if (fb_helper)
 304                 drm_fb_helper_hotplug_event(fb_helper);
 305         else
 306                 exynos_drm_fbdev_init(dev);
 307 }
 308
 309 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 310         .fb_create = exynos_user_fb_create,
 311         .output_poll_changed = exynos_drm_output_poll_changed,
 312 };
 313
 314 void exynos_drm_mode_config_init(struct drm_device *dev)
 315 {
 316         dev->mode_config.min_width = 0;
 317         dev->mode_config.min_height = 0;
 318
 319         /*
 320          * set max width and height as default value(4096x4096).
 321          * this value would be used to check framebuffer size limitation
 322          * at drm_mode_addfb().
 323          */
 324         dev->mode_config.max_width = 4096;
 325         dev->mode_config.max_height = 4096;
 326
 327         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 328 }