root/drivers/gpu/drm/drm_framebuffer.c

DEFINITIONS

1. drm_framebuffer_check_src_coords
2. drm_mode_addfb
3. drm_mode_addfb_ioctl
4. fb_plane_width
5. fb_plane_height
6. framebuffer_check
7. drm_internal_framebuffer_create
8. drm_mode_addfb2
9. drm_mode_addfb2_ioctl
10. drm_mode_rmfb_work_fn
11. drm_mode_rmfb
12. drm_mode_rmfb_ioctl
13. drm_mode_getfb
14. drm_mode_dirtyfb_ioctl
15. drm_fb_release
16. drm_framebuffer_free
17. drm_framebuffer_init
18. drm_framebuffer_lookup
19. drm_framebuffer_unregister_private
20. drm_framebuffer_cleanup
21. atomic_remove_fb
22. legacy_remove_fb
23. drm_framebuffer_remove
24. drm_framebuffer_plane_width
25. drm_framebuffer_plane_height
26. drm_framebuffer_print_info
27. drm_framebuffer_info
28. drm_framebuffer_debugfs_init

   1 /*
   2  * Copyright (c) 2016 Intel Corporation
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22 
  23 #include <linux/export.h>
  24 #include <linux/uaccess.h>
  25 
  26 #include <drm/drm_atomic.h>
  27 #include <drm/drm_atomic_uapi.h>
  28 #include <drm/drm_auth.h>
  29 #include <drm/drm_debugfs.h>
  30 #include <drm/drm_drv.h>
  31 #include <drm/drm_file.h>
  32 #include <drm/drm_fourcc.h>
  33 #include <drm/drm_framebuffer.h>
  34 #include <drm/drm_print.h>
  35 #include <drm/drm_util.h>
  36 
  37 #include "drm_crtc_internal.h"
  38 #include "drm_internal.h"
  39 
  40 /**
  41  * DOC: overview
  42  *
  43  * Frame buffers are abstract memory objects that provide a source of pixels to
  44  * scanout to a CRTC. Applications explicitly request the creation of frame
  45  * buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls and receive an opaque
  46  * handle that can be passed to the KMS CRTC control, plane configuration and
  47  * page flip functions.
  48  *
  49  * Frame buffers rely on the underlying memory manager for allocating backing
  50  * storage. When creating a frame buffer applications pass a memory handle
  51  * (or a list of memory handles for multi-planar formats) through the
  52  * &struct drm_mode_fb_cmd2 argument. For drivers using GEM as their userspace
  53  * buffer management interface this would be a GEM handle.  Drivers are however
  54  * free to use their own backing storage object handles, e.g. vmwgfx directly
  55  * exposes special TTM handles to userspace and so expects TTM handles in the
  56  * create ioctl and not GEM handles.
  57  *
  58  * Framebuffers are tracked with &struct drm_framebuffer. They are published
  59  * using drm_framebuffer_init() - after calling that function userspace can use
  60  * and access the framebuffer object. The helper function
  61  * drm_helper_mode_fill_fb_struct() can be used to pre-fill the required
  62  * metadata fields.
  63  *
  64  * The lifetime of a drm framebuffer is controlled with a reference count,
  65  * drivers can grab additional references with drm_framebuffer_get() and drop
  66  * them again with drm_framebuffer_put(). For driver-private framebuffers for
  67  * which the last reference is never dropped (e.g. for the fbdev framebuffer
  68  * when the struct &struct drm_framebuffer is embedded into the fbdev helper
  69  * struct) drivers can manually clean up a framebuffer at module unload time
  70  * with drm_framebuffer_unregister_private(). But doing this is not
  71  * recommended, and it's better to have a normal free-standing &struct
  72  * drm_framebuffer.
  73  */
  74 
  75 int drm_framebuffer_check_src_coords(uint32_t src_x, uint32_t src_y,
  76                                      uint32_t src_w, uint32_t src_h,
  77                                      const struct drm_framebuffer *fb)
  78 {
  79         unsigned int fb_width, fb_height;
  80 
  81         fb_width = fb->width << 16;
  82         fb_height = fb->height << 16;
  83 
  84         /* Make sure source coordinates are inside the fb. */
  85         if (src_w > fb_width ||
  86             src_x > fb_width - src_w ||
  87             src_h > fb_height ||
  88             src_y > fb_height - src_h) {
  89                 DRM_DEBUG_KMS("Invalid source coordinates "
  90                               "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
  91                               src_w >> 16, ((src_w & 0xffff) * 15625) >> 10,
  92                               src_h >> 16, ((src_h & 0xffff) * 15625) >> 10,
  93                               src_x >> 16, ((src_x & 0xffff) * 15625) >> 10,
  94                               src_y >> 16, ((src_y & 0xffff) * 15625) >> 10,
  95                               fb->width, fb->height);
  96                 return -ENOSPC;
  97         }
  98 
  99         return 0;
 100 }
 101 
 102 /**
 103  * drm_mode_addfb - add an FB to the graphics configuration
 104  * @dev: drm device for the ioctl
 105  * @or: pointer to request structure
 106  * @file_priv: drm file
 107  *
 108  * Add a new FB to the specified CRTC, given a user request. This is the
 109  * original addfb ioctl which only supported RGB formats.
 110  *
 111  * Called by the user via ioctl, or by an in-kernel client.
 112  *
 113  * Returns:
 114  * Zero on success, negative errno on failure.
 115  */
 116 int drm_mode_addfb(struct drm_device *dev, struct drm_mode_fb_cmd *or,
 117                    struct drm_file *file_priv)
 118 {
 119         struct drm_mode_fb_cmd2 r = {};
 120         int ret;
 121 
 122         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 123                 return -EOPNOTSUPP;
 124 
 125         r.pixel_format = drm_driver_legacy_fb_format(dev, or->bpp, or->depth);
 126         if (r.pixel_format == DRM_FORMAT_INVALID) {
 127                 DRM_DEBUG("bad {bpp:%d, depth:%d}\n", or->bpp, or->depth);
 128                 return -EINVAL;
 129         }
 130 
 131         /* convert to new format and call new ioctl */
 132         r.fb_id = or->fb_id;
 133         r.width = or->width;
 134         r.height = or->height;
 135         r.pitches[0] = or->pitch;
 136         r.handles[0] = or->handle;
 137 
 138         ret = drm_mode_addfb2(dev, &r, file_priv);
 139         if (ret)
 140                 return ret;
 141 
 142         or->fb_id = r.fb_id;
 143 
 144         return 0;
 145 }
 146 
 147 int drm_mode_addfb_ioctl(struct drm_device *dev,
 148                          void *data, struct drm_file *file_priv)
 149 {
 150         return drm_mode_addfb(dev, data, file_priv);
 151 }
 152 
 153 static int fb_plane_width(int width,
 154                           const struct drm_format_info *format, int plane)
 155 {
 156         if (plane == 0)
 157                 return width;
 158 
 159         return DIV_ROUND_UP(width, format->hsub);
 160 }
 161 
 162 static int fb_plane_height(int height,
 163                            const struct drm_format_info *format, int plane)
 164 {
 165         if (plane == 0)
 166                 return height;
 167 
 168         return DIV_ROUND_UP(height, format->vsub);
 169 }
 170 
 171 static int framebuffer_check(struct drm_device *dev,
 172                              const struct drm_mode_fb_cmd2 *r)
 173 {
 174         const struct drm_format_info *info;
 175         int i;
 176 
 177         /* check if the format is supported at all */
 178         info = __drm_format_info(r->pixel_format);
 179         if (!info) {
 180                 struct drm_format_name_buf format_name;
 181 
 182                 DRM_DEBUG_KMS("bad framebuffer format %s\n",
 183                               drm_get_format_name(r->pixel_format,
 184                                                   &format_name));
 185                 return -EINVAL;
 186         }
 187 
 188         /* now let the driver pick its own format info */
 189         info = drm_get_format_info(dev, r);
 190 
 191         if (r->width == 0) {
 192                 DRM_DEBUG_KMS("bad framebuffer width %u\n", r->width);
 193                 return -EINVAL;
 194         }
 195 
 196         if (r->height == 0) {
 197                 DRM_DEBUG_KMS("bad framebuffer height %u\n", r->height);
 198                 return -EINVAL;
 199         }
 200 
 201         for (i = 0; i < info->num_planes; i++) {
 202                 unsigned int width = fb_plane_width(r->width, info, i);
 203                 unsigned int height = fb_plane_height(r->height, info, i);
 204                 unsigned int block_size = info->char_per_block[i];
 205                 u64 min_pitch = drm_format_info_min_pitch(info, i, width);
 206 
 207                 if (!block_size && (r->modifier[i] == DRM_FORMAT_MOD_LINEAR)) {
 208                         DRM_DEBUG_KMS("Format requires non-linear modifier for plane %d\n", i);
 209                         return -EINVAL;
 210                 }
 211 
 212                 if (!r->handles[i]) {
 213                         DRM_DEBUG_KMS("no buffer object handle for plane %d\n", i);
 214                         return -EINVAL;
 215                 }
 216 
 217                 if (min_pitch > UINT_MAX)
 218                         return -ERANGE;
 219 
 220                 if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX)
 221                         return -ERANGE;
 222 
 223                 if (block_size && r->pitches[i] < min_pitch) {
 224                         DRM_DEBUG_KMS("bad pitch %u for plane %d\n", r->pitches[i], i);
 225                         return -EINVAL;
 226                 }
 227 
 228                 if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) {
 229                         DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
 230                                       r->modifier[i], i);
 231                         return -EINVAL;
 232                 }
 233 
 234                 if (r->flags & DRM_MODE_FB_MODIFIERS &&
 235                     r->modifier[i] != r->modifier[0]) {
 236                         DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
 237                                       r->modifier[i], i);
 238                         return -EINVAL;
 239                 }
 240 
 241                 /* modifier specific checks: */
 242                 switch (r->modifier[i]) {
 243                 case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
 244                         /* NOTE: the pitch restriction may be lifted later if it turns
 245                          * out that no hw has this restriction:
 246                          */
 247                         if (r->pixel_format != DRM_FORMAT_NV12 ||
 248                                         width % 128 || height % 32 ||
 249                                         r->pitches[i] % 128) {
 250                                 DRM_DEBUG_KMS("bad modifier data for plane %d\n", i);
 251                                 return -EINVAL;
 252                         }
 253                         break;
 254 
 255                 default:
 256                         break;
 257                 }
 258         }
 259 
 260         for (i = info->num_planes; i < 4; i++) {
 261                 if (r->modifier[i]) {
 262                         DRM_DEBUG_KMS("non-zero modifier for unused plane %d\n", i);
 263                         return -EINVAL;
 264                 }
 265 
 266                 /* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */
 267                 if (!(r->flags & DRM_MODE_FB_MODIFIERS))
 268                         continue;
 269 
 270                 if (r->handles[i]) {
 271                         DRM_DEBUG_KMS("buffer object handle for unused plane %d\n", i);
 272                         return -EINVAL;
 273                 }
 274 
 275                 if (r->pitches[i]) {
 276                         DRM_DEBUG_KMS("non-zero pitch for unused plane %d\n", i);
 277                         return -EINVAL;
 278                 }
 279 
 280                 if (r->offsets[i]) {
 281                         DRM_DEBUG_KMS("non-zero offset for unused plane %d\n", i);
 282                         return -EINVAL;
 283                 }
 284         }
 285 
 286         return 0;
 287 }
 288 
 289 struct drm_framebuffer *
 290 drm_internal_framebuffer_create(struct drm_device *dev,
 291                                 const struct drm_mode_fb_cmd2 *r,
 292                                 struct drm_file *file_priv)
 293 {
 294         struct drm_mode_config *config = &dev->mode_config;
 295         struct drm_framebuffer *fb;
 296         int ret;
 297 
 298         if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) {
 299                 DRM_DEBUG_KMS("bad framebuffer flags 0x%08x\n", r->flags);
 300                 return ERR_PTR(-EINVAL);
 301         }
 302 
 303         if ((config->min_width > r->width) || (r->width > config->max_width)) {
 304                 DRM_DEBUG_KMS("bad framebuffer width %d, should be >= %d && <= %d\n",
 305                           r->width, config->min_width, config->max_width);
 306                 return ERR_PTR(-EINVAL);
 307         }
 308         if ((config->min_height > r->height) || (r->height > config->max_height)) {
 309                 DRM_DEBUG_KMS("bad framebuffer height %d, should be >= %d && <= %d\n",
 310                           r->height, config->min_height, config->max_height);
 311                 return ERR_PTR(-EINVAL);
 312         }
 313 
 314         if (r->flags & DRM_MODE_FB_MODIFIERS &&
 315             !dev->mode_config.allow_fb_modifiers) {
 316                 DRM_DEBUG_KMS("driver does not support fb modifiers\n");
 317                 return ERR_PTR(-EINVAL);
 318         }
 319 
 320         ret = framebuffer_check(dev, r);
 321         if (ret)
 322                 return ERR_PTR(ret);
 323 
 324         fb = dev->mode_config.funcs->fb_create(dev, file_priv, r);
 325         if (IS_ERR(fb)) {
 326                 DRM_DEBUG_KMS("could not create framebuffer\n");
 327                 return fb;
 328         }
 329 
 330         return fb;
 331 }
 332 EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_internal_framebuffer_create);
 333 
 334 /**
 335  * drm_mode_addfb2 - add an FB to the graphics configuration
 336  * @dev: drm device for the ioctl
 337  * @data: data pointer for the ioctl
 338  * @file_priv: drm file for the ioctl call
 339  *
 340  * Add a new FB to the specified CRTC, given a user request with format. This is
 341  * the 2nd version of the addfb ioctl, which supports multi-planar framebuffers
 342  * and uses fourcc codes as pixel format specifiers.
 343  *
 344  * Called by the user via ioctl.
 345  *
 346  * Returns:
 347  * Zero on success, negative errno on failure.
 348  */
 349 int drm_mode_addfb2(struct drm_device *dev,
 350                     void *data, struct drm_file *file_priv)
 351 {
 352         struct drm_mode_fb_cmd2 *r = data;
 353         struct drm_framebuffer *fb;
 354 
 355         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 356                 return -EOPNOTSUPP;
 357 
 358         fb = drm_internal_framebuffer_create(dev, r, file_priv);
 359         if (IS_ERR(fb))
 360                 return PTR_ERR(fb);
 361 
 362         DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
 363         r->fb_id = fb->base.id;
 364 
 365         /* Transfer ownership to the filp for reaping on close */
 366         mutex_lock(&file_priv->fbs_lock);
 367         list_add(&fb->filp_head, &file_priv->fbs);
 368         mutex_unlock(&file_priv->fbs_lock);
 369 
 370         return 0;
 371 }
 372 
 373 int drm_mode_addfb2_ioctl(struct drm_device *dev,
 374                           void *data, struct drm_file *file_priv)
 375 {
 376 #ifdef __BIG_ENDIAN
 377         if (!dev->mode_config.quirk_addfb_prefer_host_byte_order) {
 378                 /*
 379                  * Drivers must set the
 380                  * quirk_addfb_prefer_host_byte_order quirk to make
 381                  * the drm_mode_addfb() compat code work correctly on
 382                  * bigendian machines.
 383                  *
 384                  * If they don't they interpret pixel_format values
 385                  * incorrectly for bug compatibility, which in turn
 386                  * implies the ADDFB2 ioctl does not work correctly
 387                  * then.  So block it to make userspace fallback to
 388                  * ADDFB.
 389                  */
 390                 DRM_DEBUG_KMS("addfb2 broken on bigendian");
 391                 return -EOPNOTSUPP;
 392         }
 393 #endif
 394         return drm_mode_addfb2(dev, data, file_priv);
 395 }
 396 
 397 struct drm_mode_rmfb_work {
 398         struct work_struct work;
 399         struct list_head fbs;
 400 };
 401 
 402 static void drm_mode_rmfb_work_fn(struct work_struct *w)
 403 {
 404         struct drm_mode_rmfb_work *arg = container_of(w, typeof(*arg), work);
 405 
 406         while (!list_empty(&arg->fbs)) {
 407                 struct drm_framebuffer *fb =
 408                         list_first_entry(&arg->fbs, typeof(*fb), filp_head);
 409 
 410                 list_del_init(&fb->filp_head);
 411                 drm_framebuffer_remove(fb);
 412         }
 413 }
 414 
 415 /**
 416  * drm_mode_rmfb - remove an FB from the configuration
 417  * @dev: drm device
 418  * @fb_id: id of framebuffer to remove
 419  * @file_priv: drm file
 420  *
 421  * Remove the specified FB.
 422  *
 423  * Called by the user via ioctl, or by an in-kernel client.
 424  *
 425  * Returns:
 426  * Zero on success, negative errno on failure.
 427  */
 428 int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
 429                   struct drm_file *file_priv)
 430 {
 431         struct drm_framebuffer *fb = NULL;
 432         struct drm_framebuffer *fbl = NULL;
 433         int found = 0;
 434 
 435         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 436                 return -EOPNOTSUPP;
 437 
 438         fb = drm_framebuffer_lookup(dev, file_priv, fb_id);
 439         if (!fb)
 440                 return -ENOENT;
 441 
 442         mutex_lock(&file_priv->fbs_lock);
 443         list_for_each_entry(fbl, &file_priv->fbs, filp_head)
 444                 if (fb == fbl)
 445                         found = 1;
 446         if (!found) {
 447                 mutex_unlock(&file_priv->fbs_lock);
 448                 goto fail_unref;
 449         }
 450 
 451         list_del_init(&fb->filp_head);
 452         mutex_unlock(&file_priv->fbs_lock);
 453 
 454         /* drop the reference we picked up in framebuffer lookup */
 455         drm_framebuffer_put(fb);
 456 
 457         /*
 458          * we now own the reference that was stored in the fbs list
 459          *
 460          * drm_framebuffer_remove may fail with -EINTR on pending signals,
 461          * so run this in a separate stack as there's no way to correctly
 462          * handle this after the fb is already removed from the lookup table.
 463          */
 464         if (drm_framebuffer_read_refcount(fb) > 1) {
 465                 struct drm_mode_rmfb_work arg;
 466 
 467                 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
 468                 INIT_LIST_HEAD(&arg.fbs);
 469                 list_add_tail(&fb->filp_head, &arg.fbs);
 470 
 471                 schedule_work(&arg.work);
 472                 flush_work(&arg.work);
 473                 destroy_work_on_stack(&arg.work);
 474         } else
 475                 drm_framebuffer_put(fb);
 476 
 477         return 0;
 478 
 479 fail_unref:
 480         drm_framebuffer_put(fb);
 481         return -ENOENT;
 482 }
 483 
 484 int drm_mode_rmfb_ioctl(struct drm_device *dev,
 485                         void *data, struct drm_file *file_priv)
 486 {
 487         uint32_t *fb_id = data;
 488 
 489         return drm_mode_rmfb(dev, *fb_id, file_priv);
 490 }
 491 
 492 /**
 493  * drm_mode_getfb - get FB info
 494  * @dev: drm device for the ioctl
 495  * @data: data pointer for the ioctl
 496  * @file_priv: drm file for the ioctl call
 497  *
 498  * Lookup the FB given its ID and return info about it.
 499  *
 500  * Called by the user via ioctl.
 501  *
 502  * Returns:
 503  * Zero on success, negative errno on failure.
 504  */
 505 int drm_mode_getfb(struct drm_device *dev,
 506                    void *data, struct drm_file *file_priv)
 507 {
 508         struct drm_mode_fb_cmd *r = data;
 509         struct drm_framebuffer *fb;
 510         int ret;
 511 
 512         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 513                 return -EOPNOTSUPP;
 514 
 515         fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
 516         if (!fb)
 517                 return -ENOENT;
 518 
 519         /* Multi-planar framebuffers need getfb2. */
 520         if (fb->format->num_planes > 1) {
 521                 ret = -EINVAL;
 522                 goto out;
 523         }
 524 
 525         if (!fb->funcs->create_handle) {
 526                 ret = -ENODEV;
 527                 goto out;
 528         }
 529 
 530         r->height = fb->height;
 531         r->width = fb->width;
 532         r->depth = fb->format->depth;
 533         r->bpp = fb->format->cpp[0] * 8;
 534         r->pitch = fb->pitches[0];
 535 
 536         /* GET_FB() is an unprivileged ioctl so we must not return a
 537          * buffer-handle to non-master processes! For
 538          * backwards-compatibility reasons, we cannot make GET_FB() privileged,
 539          * so just return an invalid handle for non-masters.
 540          */
 541         if (!drm_is_current_master(file_priv) && !capable(CAP_SYS_ADMIN)) {
 542                 r->handle = 0;
 543                 ret = 0;
 544                 goto out;
 545         }
 546 
 547         ret = fb->funcs->create_handle(fb, file_priv, &r->handle);
 548 
 549 out:
 550         drm_framebuffer_put(fb);
 551 
 552         return ret;
 553 }
 554 
 555 /**
 556  * drm_mode_dirtyfb_ioctl - flush frontbuffer rendering on an FB
 557  * @dev: drm device for the ioctl
 558  * @data: data pointer for the ioctl
 559  * @file_priv: drm file for the ioctl call
 560  *
 561  * Lookup the FB and flush out the damaged area supplied by userspace as a clip
 562  * rectangle list. Generic userspace which does frontbuffer rendering must call
 563  * this ioctl to flush out the changes on manual-update display outputs, e.g.
 564  * usb display-link, mipi manual update panels or edp panel self refresh modes.
 565  *
 566  * Modesetting drivers which always update the frontbuffer do not need to
 567  * implement the corresponding &drm_framebuffer_funcs.dirty callback.
 568  *
 569  * Called by the user via ioctl.
 570  *
 571  * Returns:
 572  * Zero on success, negative errno on failure.
 573  */
 574 int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
 575                            void *data, struct drm_file *file_priv)
 576 {
 577         struct drm_clip_rect __user *clips_ptr;
 578         struct drm_clip_rect *clips = NULL;
 579         struct drm_mode_fb_dirty_cmd *r = data;
 580         struct drm_framebuffer *fb;
 581         unsigned flags;
 582         int num_clips;
 583         int ret;
 584 
 585         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 586                 return -EOPNOTSUPP;
 587 
 588         fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
 589         if (!fb)
 590                 return -ENOENT;
 591 
 592         num_clips = r->num_clips;
 593         clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr;
 594 
 595         if (!num_clips != !clips_ptr) {
 596                 ret = -EINVAL;
 597                 goto out_err1;
 598         }
 599 
 600         flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags;
 601 
 602         /* If userspace annotates copy, clips must come in pairs */
 603         if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) {
 604                 ret = -EINVAL;
 605                 goto out_err1;
 606         }
 607 
 608         if (num_clips && clips_ptr) {
 609                 if (num_clips < 0 || num_clips > DRM_MODE_FB_DIRTY_MAX_CLIPS) {
 610                         ret = -EINVAL;
 611                         goto out_err1;
 612                 }
 613                 clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
 614                 if (!clips) {
 615                         ret = -ENOMEM;
 616                         goto out_err1;
 617                 }
 618 
 619                 ret = copy_from_user(clips, clips_ptr,
 620                                      num_clips * sizeof(*clips));
 621                 if (ret) {
 622                         ret = -EFAULT;
 623                         goto out_err2;
 624                 }
 625         }
 626 
 627         if (fb->funcs->dirty) {
 628                 ret = fb->funcs->dirty(fb, file_priv, flags, r->color,
 629                                        clips, num_clips);
 630         } else {
 631                 ret = -ENOSYS;
 632         }
 633 
 634 out_err2:
 635         kfree(clips);
 636 out_err1:
 637         drm_framebuffer_put(fb);
 638 
 639         return ret;
 640 }
 641 
 642 /**
 643  * drm_fb_release - remove and free the FBs on this file
 644  * @priv: drm file for the ioctl
 645  *
 646  * Destroy all the FBs associated with @filp.
 647  *
 648  * Called by the user via ioctl.
 649  *
 650  * Returns:
 651  * Zero on success, negative errno on failure.
 652  */
 653 void drm_fb_release(struct drm_file *priv)
 654 {
 655         struct drm_framebuffer *fb, *tfb;
 656         struct drm_mode_rmfb_work arg;
 657 
 658         INIT_LIST_HEAD(&arg.fbs);
 659 
 660         /*
 661          * When the file gets released that means no one else can access the fb
 662          * list any more, so no need to grab fpriv->fbs_lock. And we need to
 663          * avoid upsetting lockdep since the universal cursor code adds a
 664          * framebuffer while holding mutex locks.
 665          *
 666          * Note that a real deadlock between fpriv->fbs_lock and the modeset
 667          * locks is impossible here since no one else but this function can get
 668          * at it any more.
 669          */
 670         list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
 671                 if (drm_framebuffer_read_refcount(fb) > 1) {
 672                         list_move_tail(&fb->filp_head, &arg.fbs);
 673                 } else {
 674                         list_del_init(&fb->filp_head);
 675 
 676                         /* This drops the fpriv->fbs reference. */
 677                         drm_framebuffer_put(fb);
 678                 }
 679         }
 680 
 681         if (!list_empty(&arg.fbs)) {
 682                 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
 683 
 684                 schedule_work(&arg.work);
 685                 flush_work(&arg.work);
 686                 destroy_work_on_stack(&arg.work);
 687         }
 688 }
 689 
 690 void drm_framebuffer_free(struct kref *kref)
 691 {
 692         struct drm_framebuffer *fb =
 693                         container_of(kref, struct drm_framebuffer, base.refcount);
 694         struct drm_device *dev = fb->dev;
 695 
 696         /*
 697          * The lookup idr holds a weak reference, which has not necessarily been
 698          * removed at this point. Check for that.
 699          */
 700         drm_mode_object_unregister(dev, &fb->base);
 701 
 702         fb->funcs->destroy(fb);
 703 }
 704 
 705 /**
 706  * drm_framebuffer_init - initialize a framebuffer
 707  * @dev: DRM device
 708  * @fb: framebuffer to be initialized
 709  * @funcs: ... with these functions
 710  *
 711  * Allocates an ID for the framebuffer's parent mode object, sets its mode
 712  * functions & device file and adds it to the master fd list.
 713  *
 714  * IMPORTANT:
 715  * This functions publishes the fb and makes it available for concurrent access
 716  * by other users. Which means by this point the fb _must_ be fully set up -
 717  * since all the fb attributes are invariant over its lifetime, no further
 718  * locking but only correct reference counting is required.
 719  *
 720  * Returns:
 721  * Zero on success, error code on failure.
 722  */
 723 int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
 724                          const struct drm_framebuffer_funcs *funcs)
 725 {
 726         int ret;
 727 
 728         if (WARN_ON_ONCE(fb->dev != dev || !fb->format))
 729                 return -EINVAL;
 730 
 731         INIT_LIST_HEAD(&fb->filp_head);
 732 
 733         fb->funcs = funcs;
 734         strcpy(fb->comm, current->comm);
 735 
 736         ret = __drm_mode_object_add(dev, &fb->base, DRM_MODE_OBJECT_FB,
 737                                     false, drm_framebuffer_free);
 738         if (ret)
 739                 goto out;
 740 
 741         mutex_lock(&dev->mode_config.fb_lock);
 742         dev->mode_config.num_fb++;
 743         list_add(&fb->head, &dev->mode_config.fb_list);
 744         mutex_unlock(&dev->mode_config.fb_lock);
 745 
 746         drm_mode_object_register(dev, &fb->base);
 747 out:
 748         return ret;
 749 }
 750 EXPORT_SYMBOL(drm_framebuffer_init);
 751 
 752 /**
 753  * drm_framebuffer_lookup - look up a drm framebuffer and grab a reference
 754  * @dev: drm device
 755  * @file_priv: drm file to check for lease against.
 756  * @id: id of the fb object
 757  *
 758  * If successful, this grabs an additional reference to the framebuffer -
 759  * callers need to make sure to eventually unreference the returned framebuffer
 760  * again, using drm_framebuffer_put().
 761  */
 762 struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
 763                                                struct drm_file *file_priv,
 764                                                uint32_t id)
 765 {
 766         struct drm_mode_object *obj;
 767         struct drm_framebuffer *fb = NULL;
 768 
 769         obj = __drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_FB);
 770         if (obj)
 771                 fb = obj_to_fb(obj);
 772         return fb;
 773 }
 774 EXPORT_SYMBOL(drm_framebuffer_lookup);
 775 
 776 /**
 777  * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
 778  * @fb: fb to unregister
 779  *
 780  * Drivers need to call this when cleaning up driver-private framebuffers, e.g.
 781  * those used for fbdev. Note that the caller must hold a reference of its own,
 782  * i.e. the object may not be destroyed through this call (since it'll lead to a
 783  * locking inversion).
 784  *
 785  * NOTE: This function is deprecated. For driver-private framebuffers it is not
 786  * recommended to embed a framebuffer struct info fbdev struct, instead, a
 787  * framebuffer pointer is preferred and drm_framebuffer_put() should be called
 788  * when the framebuffer is to be cleaned up.
 789  */
 790 void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
 791 {
 792         struct drm_device *dev;
 793 
 794         if (!fb)
 795                 return;
 796 
 797         dev = fb->dev;
 798 
 799         /* Mark fb as reaped and drop idr ref. */
 800         drm_mode_object_unregister(dev, &fb->base);
 801 }
 802 EXPORT_SYMBOL(drm_framebuffer_unregister_private);
 803 
 804 /**
 805  * drm_framebuffer_cleanup - remove a framebuffer object
 806  * @fb: framebuffer to remove
 807  *
 808  * Cleanup framebuffer. This function is intended to be used from the drivers
 809  * &drm_framebuffer_funcs.destroy callback. It can also be used to clean up
 810  * driver private framebuffers embedded into a larger structure.
 811  *
 812  * Note that this function does not remove the fb from active usage - if it is
 813  * still used anywhere, hilarity can ensue since userspace could call getfb on
 814  * the id and get back -EINVAL. Obviously no concern at driver unload time.
 815  *
 816  * Also, the framebuffer will not be removed from the lookup idr - for
 817  * user-created framebuffers this will happen in in the rmfb ioctl. For
 818  * driver-private objects (e.g. for fbdev) drivers need to explicitly call
 819  * drm_framebuffer_unregister_private.
 820  */
 821 void drm_framebuffer_cleanup(struct drm_framebuffer *fb)
 822 {
 823         struct drm_device *dev = fb->dev;
 824 
 825         mutex_lock(&dev->mode_config.fb_lock);
 826         list_del(&fb->head);
 827         dev->mode_config.num_fb--;
 828         mutex_unlock(&dev->mode_config.fb_lock);
 829 }
 830 EXPORT_SYMBOL(drm_framebuffer_cleanup);
 831 
 832 static int atomic_remove_fb(struct drm_framebuffer *fb)
 833 {
 834         struct drm_modeset_acquire_ctx ctx;
 835         struct drm_device *dev = fb->dev;
 836         struct drm_atomic_state *state;
 837         struct drm_plane *plane;
 838         struct drm_connector *conn __maybe_unused;
 839         struct drm_connector_state *conn_state;
 840         int i, ret;
 841         unsigned plane_mask;
 842         bool disable_crtcs = false;
 843 
 844 retry_disable:
 845         drm_modeset_acquire_init(&ctx, 0);
 846 
 847         state = drm_atomic_state_alloc(dev);
 848         if (!state) {
 849                 ret = -ENOMEM;
 850                 goto out;
 851         }
 852         state->acquire_ctx = &ctx;
 853 
 854 retry:
 855         plane_mask = 0;
 856         ret = drm_modeset_lock_all_ctx(dev, &ctx);
 857         if (ret)
 858                 goto unlock;
 859 
 860         drm_for_each_plane(plane, dev) {
 861                 struct drm_plane_state *plane_state;
 862 
 863                 if (plane->state->fb != fb)
 864                         continue;
 865 
 866                 plane_state = drm_atomic_get_plane_state(state, plane);
 867                 if (IS_ERR(plane_state)) {
 868                         ret = PTR_ERR(plane_state);
 869                         goto unlock;
 870                 }
 871 
 872                 if (disable_crtcs && plane_state->crtc->primary == plane) {
 873                         struct drm_crtc_state *crtc_state;
 874 
 875                         crtc_state = drm_atomic_get_existing_crtc_state(state, plane_state->crtc);
 876 
 877                         ret = drm_atomic_add_affected_connectors(state, plane_state->crtc);
 878                         if (ret)
 879                                 goto unlock;
 880 
 881                         crtc_state->active = false;
 882                         ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
 883                         if (ret)
 884                                 goto unlock;
 885                 }
 886 
 887                 drm_atomic_set_fb_for_plane(plane_state, NULL);
 888                 ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
 889                 if (ret)
 890                         goto unlock;
 891 
 892                 plane_mask |= drm_plane_mask(plane);
 893         }
 894 
 895         /* This list is only filled when disable_crtcs is set. */
 896         for_each_new_connector_in_state(state, conn, conn_state, i) {
 897                 ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
 898 
 899                 if (ret)
 900                         goto unlock;
 901         }
 902 
 903         if (plane_mask)
 904                 ret = drm_atomic_commit(state);
 905 
 906 unlock:
 907         if (ret == -EDEADLK) {
 908                 drm_atomic_state_clear(state);
 909                 drm_modeset_backoff(&ctx);
 910                 goto retry;
 911         }
 912 
 913         drm_atomic_state_put(state);
 914 
 915 out:
 916         drm_modeset_drop_locks(&ctx);
 917         drm_modeset_acquire_fini(&ctx);
 918 
 919         if (ret == -EINVAL && !disable_crtcs) {
 920                 disable_crtcs = true;
 921                 goto retry_disable;
 922         }
 923 
 924         return ret;
 925 }
 926 
 927 static void legacy_remove_fb(struct drm_framebuffer *fb)
 928 {
 929         struct drm_device *dev = fb->dev;
 930         struct drm_crtc *crtc;
 931         struct drm_plane *plane;
 932 
 933         drm_modeset_lock_all(dev);
 934         /* remove from any CRTC */
 935         drm_for_each_crtc(crtc, dev) {
 936                 if (crtc->primary->fb == fb) {
 937                         /* should turn off the crtc */
 938                         if (drm_crtc_force_disable(crtc))
 939                                 DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);
 940                 }
 941         }
 942 
 943         drm_for_each_plane(plane, dev) {
 944                 if (plane->fb == fb)
 945                         drm_plane_force_disable(plane);
 946         }
 947         drm_modeset_unlock_all(dev);
 948 }
 949 
 950 /**
 951  * drm_framebuffer_remove - remove and unreference a framebuffer object
 952  * @fb: framebuffer to remove
 953  *
 954  * Scans all the CRTCs and planes in @dev's mode_config.  If they're
 955  * using @fb, removes it, setting it to NULL. Then drops the reference to the
 956  * passed-in framebuffer. Might take the modeset locks.
 957  *
 958  * Note that this function optimizes the cleanup away if the caller holds the
 959  * last reference to the framebuffer. It is also guaranteed to not take the
 960  * modeset locks in this case.
 961  */
 962 void drm_framebuffer_remove(struct drm_framebuffer *fb)
 963 {
 964         struct drm_device *dev;
 965 
 966         if (!fb)
 967                 return;
 968 
 969         dev = fb->dev;
 970 
 971         WARN_ON(!list_empty(&fb->filp_head));
 972 
 973         /*
 974          * drm ABI mandates that we remove any deleted framebuffers from active
 975          * useage. But since most sane clients only remove framebuffers they no
 976          * longer need, try to optimize this away.
 977          *
 978          * Since we're holding a reference ourselves, observing a refcount of 1
 979          * means that we're the last holder and can skip it. Also, the refcount
 980          * can never increase from 1 again, so we don't need any barriers or
 981          * locks.
 982          *
 983          * Note that userspace could try to race with use and instate a new
 984          * usage _after_ we've cleared all current ones. End result will be an
 985          * in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot
 986          * in this manner.
 987          */
 988         if (drm_framebuffer_read_refcount(fb) > 1) {
 989                 if (drm_drv_uses_atomic_modeset(dev)) {
 990                         int ret = atomic_remove_fb(fb);
 991                         WARN(ret, "atomic remove_fb failed with %i\n", ret);
 992                 } else
 993                         legacy_remove_fb(fb);
 994         }
 995 
 996         drm_framebuffer_put(fb);
 997 }
 998 EXPORT_SYMBOL(drm_framebuffer_remove);
 999 
1000 /**
1001  * drm_framebuffer_plane_width - width of the plane given the first plane
1002  * @width: width of the first plane
1003  * @fb: the framebuffer
1004  * @plane: plane index
1005  *
1006  * Returns:
1007  * The width of @plane, given that the width of the first plane is @width.
1008  */
1009 int drm_framebuffer_plane_width(int width,
1010                                 const struct drm_framebuffer *fb, int plane)
1011 {
1012         if (plane >= fb->format->num_planes)
1013                 return 0;
1014 
1015         return fb_plane_width(width, fb->format, plane);
1016 }
1017 EXPORT_SYMBOL(drm_framebuffer_plane_width);
1018 
1019 /**
1020  * drm_framebuffer_plane_height - height of the plane given the first plane
1021  * @height: height of the first plane
1022  * @fb: the framebuffer
1023  * @plane: plane index
1024  *
1025  * Returns:
1026  * The height of @plane, given that the height of the first plane is @height.
1027  */
1028 int drm_framebuffer_plane_height(int height,
1029                                  const struct drm_framebuffer *fb, int plane)
1030 {
1031         if (plane >= fb->format->num_planes)
1032                 return 0;
1033 
1034         return fb_plane_height(height, fb->format, plane);
1035 }
1036 EXPORT_SYMBOL(drm_framebuffer_plane_height);
1037 
1038 void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
1039                                 const struct drm_framebuffer *fb)
1040 {
1041         struct drm_format_name_buf format_name;
1042         unsigned int i;
1043 
1044         drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
1045         drm_printf_indent(p, indent, "refcount=%u\n",
1046                           drm_framebuffer_read_refcount(fb));
1047         drm_printf_indent(p, indent, "format=%s\n",
1048                           drm_get_format_name(fb->format->format, &format_name));
1049         drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
1050         drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
1051         drm_printf_indent(p, indent, "layers:\n");
1052 
1053         for (i = 0; i < fb->format->num_planes; i++) {
1054                 drm_printf_indent(p, indent + 1, "size[%u]=%dx%d\n", i,
1055                                   drm_framebuffer_plane_width(fb->width, fb, i),
1056                                   drm_framebuffer_plane_height(fb->height, fb, i));
1057                 drm_printf_indent(p, indent + 1, "pitch[%u]=%u\n", i, fb->pitches[i]);
1058                 drm_printf_indent(p, indent + 1, "offset[%u]=%u\n", i, fb->offsets[i]);
1059                 drm_printf_indent(p, indent + 1, "obj[%u]:%s\n", i,
1060                                   fb->obj[i] ? "" : "(null)");
1061                 if (fb->obj[i])
1062                         drm_gem_print_info(p, indent + 2, fb->obj[i]);
1063         }
1064 }
1065 
1066 #ifdef CONFIG_DEBUG_FS
1067 static int drm_framebuffer_info(struct seq_file *m, void *data)
1068 {
1069         struct drm_info_node *node = m->private;
1070         struct drm_device *dev = node->minor->dev;
1071         struct drm_printer p = drm_seq_file_printer(m);
1072         struct drm_framebuffer *fb;
1073 
1074         mutex_lock(&dev->mode_config.fb_lock);
1075         drm_for_each_fb(fb, dev) {
1076                 drm_printf(&p, "framebuffer[%u]:\n", fb->base.id);
1077                 drm_framebuffer_print_info(&p, 1, fb);
1078         }
1079         mutex_unlock(&dev->mode_config.fb_lock);
1080 
1081         return 0;
1082 }
1083 
1084 static const struct drm_info_list drm_framebuffer_debugfs_list[] = {
1085         { "framebuffer", drm_framebuffer_info, 0 },
1086 };
1087 
1088 int drm_framebuffer_debugfs_init(struct drm_minor *minor)
1089 {
1090         return drm_debugfs_create_files(drm_framebuffer_debugfs_list,
1091                                 ARRAY_SIZE(drm_framebuffer_debugfs_list),
1092                                 minor->debugfs_root, minor);
1093 }
1094 #endif