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  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  26  * OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29 #include <drm/drmP.h>
  30 #include <drm/drm_crtc.h>
  31 #include <drm/drm_crtc_helper.h>
  32 #include <drm/drm_fb_helper.h>
  33 #include <uapi/drm/exynos_drm.h>
  34
  35 #include "exynos_drm_drv.h"
  36 #include "exynos_drm_fb.h"
  37 #include "exynos_drm_gem.h"
  38 #include "exynos_drm_iommu.h"
  39
  40 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  41
  42 /*
  43  * exynos specific framebuffer structure.
  44  *
  45  * @fb: drm framebuffer obejct.
  46  * @buf_cnt: a buffer count to drm framebuffer.
  47  * @exynos_gem_obj: array of exynos specific gem object containing a gem object.
  48  */
  49 struct exynos_drm_fb {
  50         struct drm_framebuffer          fb;
  51         unsigned int                    buf_cnt;
  52         struct exynos_drm_gem_obj       *exynos_gem_obj[MAX_FB_BUFFER];
  53 };
  54
  55 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
  56                                 struct exynos_drm_gem_obj *exynos_gem_obj)
  57 {
  58         unsigned int flags;
  59
  60         /*
  61          * if exynos drm driver supports iommu then framebuffer can use
  62          * all the buffer types.
  63          */
  64         if (is_drm_iommu_supported(drm_dev))
  65                 return 0;
  66
  67         flags = exynos_gem_obj->flags;
  68
  69         /*
  70          * without iommu support, not support physically non-continuous memory
  71          * for framebuffer.
  72          */
  73         if (IS_NONCONTIG_BUFFER(flags)) {
  74                 DRM_ERROR("cannot use this gem memory type for fb.\n");
  75                 return -EINVAL;
  76         }
  77
  78         return 0;
  79 }
  80
  81 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
  82 {
  83         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  84         unsigned int i;
  85
  86         DRM_DEBUG_KMS("%s\n", __FILE__);
  87
  88         drm_framebuffer_cleanup(fb);
  89
  90         for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
  91                 struct drm_gem_object *obj;
  92
  93                 if (exynos_fb->exynos_gem_obj[i] == NULL)
  94                         continue;
  95
  96                 obj = &exynos_fb->exynos_gem_obj[i]->base;
  97                 drm_gem_object_unreference_unlocked(obj);
  98         }
  99
 100         kfree(exynos_fb);
 101         exynos_fb = NULL;
 102 }
 103
 104 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
 105                                         struct drm_file *file_priv,
 106                                         unsigned int *handle)
 107 {
 108         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 109
 110         DRM_DEBUG_KMS("%s\n", __FILE__);
 111
 112         return drm_gem_handle_create(file_priv,
 113                         &exynos_fb->exynos_gem_obj[0]->base, handle);
 114 }
 115
 116 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
 117                                 struct drm_file *file_priv, unsigned flags,
 118                                 unsigned color, struct drm_clip_rect *clips,
 119                                 unsigned num_clips)
 120 {
 121         DRM_DEBUG_KMS("%s\n", __FILE__);
 122
 123         /* TODO */
 124
 125         return 0;
 126 }
 127
 128 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 129         .destroy        = exynos_drm_fb_destroy,
 130         .create_handle  = exynos_drm_fb_create_handle,
 131         .dirty          = exynos_drm_fb_dirty,
 132 };
 133
 134 void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
 135                                                 unsigned int cnt)
 136 {
 137         struct exynos_drm_fb *exynos_fb;
 138
 139         exynos_fb = to_exynos_fb(fb);
 140
 141         exynos_fb->buf_cnt = cnt;
 142 }
 143
 144 unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
 145 {
 146         struct exynos_drm_fb *exynos_fb;
 147
 148         exynos_fb = to_exynos_fb(fb);
 149
 150         return exynos_fb->buf_cnt;
 151 }
 152
 153 struct drm_framebuffer *
 154 exynos_drm_framebuffer_init(struct drm_device *dev,
 155                             struct drm_mode_fb_cmd2 *mode_cmd,
 156                             struct drm_gem_object *obj)
 157 {
 158         struct exynos_drm_fb *exynos_fb;
 159         struct exynos_drm_gem_obj *exynos_gem_obj;
 160         int ret;
 161
 162         exynos_gem_obj = to_exynos_gem_obj(obj);
 163
 164         ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 165         if (ret < 0) {
 166                 DRM_ERROR("cannot use this gem memory type for fb.\n");
 167                 return ERR_PTR(-EINVAL);
 168         }
 169
 170         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 171         if (!exynos_fb) {
 172                 DRM_ERROR("failed to allocate exynos drm framebuffer\n");
 173                 return ERR_PTR(-ENOMEM);
 174         }
 175
 176         exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
 177
 178         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 179         if (ret) {
 180                 DRM_ERROR("failed to initialize framebuffer\n");
 181                 return ERR_PTR(ret);
 182         }
 183
 184         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 185
 186         return &exynos_fb->fb;
 187 }
 188
 189 static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd)
 190 {
 191         unsigned int cnt = 0;
 192
 193         if (mode_cmd->pixel_format != DRM_FORMAT_NV12)
 194                 return drm_format_num_planes(mode_cmd->pixel_format);
 195
 196         while (cnt != MAX_FB_BUFFER) {
 197                 if (!mode_cmd->handles[cnt])
 198                         break;
 199                 cnt++;
 200         }
 201
 202         /*
 203          * check if NV12 or NV12M.
 204          *
 205          * NV12
 206          * handles[0] = base1, offsets[0] = 0
 207          * handles[1] = base1, offsets[1] = Y_size
 208          *
 209          * NV12M
 210          * handles[0] = base1, offsets[0] = 0
 211          * handles[1] = base2, offsets[1] = 0
 212          */
 213         if (cnt == 2) {
 214                 /*
 215                  * in case of NV12 format, offsets[1] is not 0 and
 216                  * handles[0] is same as handles[1].
 217                  */
 218                 if (mode_cmd->offsets[1] &&
 219                         mode_cmd->handles[0] == mode_cmd->handles[1])
 220                         cnt = 1;
 221         }
 222
 223         return cnt;
 224 }
 225
 226 static struct drm_framebuffer *
 227 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 228                       struct drm_mode_fb_cmd2 *mode_cmd)
 229 {
 230         struct drm_gem_object *obj;
 231         struct drm_framebuffer *fb;
 232         struct exynos_drm_fb *exynos_fb;
 233         int i;
 234
 235         DRM_DEBUG_KMS("%s\n", __FILE__);
 236
 237         obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
 238         if (!obj) {
 239                 DRM_ERROR("failed to lookup gem object\n");
 240                 return ERR_PTR(-ENOENT);
 241         }
 242
 243         fb = exynos_drm_framebuffer_init(dev, mode_cmd, obj);
 244         if (IS_ERR(fb)) {
 245                 drm_gem_object_unreference_unlocked(obj);
 246                 return fb;
 247         }
 248
 249         exynos_fb = to_exynos_fb(fb);
 250         exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd);
 251
 252         DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
 253
 254         for (i = 1; i < exynos_fb->buf_cnt; i++) {
 255                 struct exynos_drm_gem_obj *exynos_gem_obj;
 256                 int ret;
 257
 258                 obj = drm_gem_object_lookup(dev, file_priv,
 259                                 mode_cmd->handles[i]);
 260                 if (!obj) {
 261                         DRM_ERROR("failed to lookup gem object\n");
 262                         exynos_drm_fb_destroy(fb);
 263                         return ERR_PTR(-ENOENT);
 264                 }
 265
 266                 exynos_gem_obj = to_exynos_gem_obj(obj);
 267
 268                 ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 269                 if (ret < 0) {
 270                         DRM_ERROR("cannot use this gem memory type for fb.\n");
 271                         exynos_drm_fb_destroy(fb);
 272                         return ERR_PTR(ret);
 273                 }
 274
 275                 exynos_fb->exynos_gem_obj[i] = to_exynos_gem_obj(obj);
 276         }
 277
 278         return fb;
 279 }
 280
 281 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
 282                                                 int index)
 283 {
 284         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 285         struct exynos_drm_gem_buf *buffer;
 286
 287         DRM_DEBUG_KMS("%s\n", __FILE__);
 288
 289         if (index >= MAX_FB_BUFFER)
 290                 return NULL;
 291
 292         buffer = exynos_fb->exynos_gem_obj[index]->buffer;
 293         if (!buffer)
 294                 return NULL;
 295
 296         DRM_DEBUG_KMS("vaddr = 0x%lx, dma_addr = 0x%lx\n",
 297                         (unsigned long)buffer->kvaddr,
 298                         (unsigned long)buffer->dma_addr);
 299
 300         return buffer;
 301 }
 302
 303 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 304 {
 305         struct exynos_drm_private *private = dev->dev_private;
 306         struct drm_fb_helper *fb_helper = private->fb_helper;
 307
 308         if (fb_helper)
 309                 drm_fb_helper_hotplug_event(fb_helper);
 310 }
 311
 312 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 313         .fb_create = exynos_user_fb_create,
 314         .output_poll_changed = exynos_drm_output_poll_changed,
 315 };
 316
 317 void exynos_drm_mode_config_init(struct drm_device *dev)
 318 {
 319         dev->mode_config.min_width = 0;
 320         dev->mode_config.min_height = 0;
 321
 322         /*
 323          * set max width and height as default value(4096x4096).
 324          * this value would be used to check framebuffer size limitation
 325          * at drm_mode_addfb().
 326          */
 327         dev->mode_config.max_width = 4096;
 328         dev->mode_config.max_height = 4096;
 329
 330         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 331 }