include/drm/drm_drv.h

   1 /*
   2  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   3  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   4  * Copyright (c) 2009-2010, Code Aurora Forum.
   5  * Copyright 2016 Intel Corp.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the next
  15  * paragraph) shall be included in all copies or substantial portions of the
  16  * Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  22  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  23  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  * OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 #ifndef _DRM_DRV_H_
  28 #define _DRM_DRV_H_
  29
  30 #include <linux/list.h>
  31 #include <linux/irqreturn.h>
  32
  33 #include <drm/drm_device.h>
  34
  35 struct drm_file;
  36 struct drm_gem_object;
  37 struct drm_master;
  38 struct drm_minor;
  39 struct dma_buf_attachment;
  40 struct drm_display_mode;
  41 struct drm_mode_create_dumb;
  42 struct drm_printer;
  43
  44 /* driver capabilities and requirements mask */
  45 #define DRIVER_USE_AGP                  0x1
  46 #define DRIVER_LEGACY                   0x2
  47 #define DRIVER_PCI_DMA                  0x8
  48 #define DRIVER_SG                       0x10
  49 #define DRIVER_HAVE_DMA                 0x20
  50 #define DRIVER_HAVE_IRQ                 0x40
  51 #define DRIVER_IRQ_SHARED               0x80
  52 #define DRIVER_GEM                      0x1000
  53 #define DRIVER_MODESET                  0x2000
  54 #define DRIVER_PRIME                    0x4000
  55 #define DRIVER_RENDER                   0x8000
  56 #define DRIVER_ATOMIC                   0x10000
  57 #define DRIVER_KMS_LEGACY_CONTEXT       0x20000
  58 #define DRIVER_SYNCOBJ                  0x40000
  59 #define DRIVER_PREFER_XBGR_30BPP        0x80000
  60
  61 /**
  62  * struct drm_driver - DRM driver structure
  63  *
  64  * This structure represent the common code for a family of cards. There will
  65  * one drm_device for each card present in this family. It contains lots of
  66  * vfunc entries, and a pile of those probably should be moved to more
  67  * appropriate places like &drm_mode_config_funcs or into a new operations
  68  * structure for GEM drivers.
  69  */
  70 struct drm_driver {
  71         /**
  72          * @load:
  73          *
  74          * Backward-compatible driver callback to complete
  75          * initialization steps after the driver is registered.  For
  76          * this reason, may suffer from race conditions and its use is
  77          * deprecated for new drivers.  It is therefore only supported
  78          * for existing drivers not yet converted to the new scheme.
  79          * See drm_dev_init() and drm_dev_register() for proper and
  80          * race-free way to set up a &struct drm_device.
  81          *
  82          * This is deprecated, do not use!
  83          *
  84          * Returns:
  85          *
  86          * Zero on success, non-zero value on failure.
  87          */
  88         int (*load) (struct drm_device *, unsigned long flags);
  89
  90         /**
  91          * @open:
  92          *
  93          * Driver callback when a new &struct drm_file is opened. Useful for
  94          * setting up driver-private data structures like buffer allocators,
  95          * execution contexts or similar things. Such driver-private resources
  96          * must be released again in @postclose.
  97          *
  98          * Since the display/modeset side of DRM can only be owned by exactly
  99          * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
 100          * there should never be a need to set up any modeset related resources
 101          * in this callback. Doing so would be a driver design bug.
 102          *
 103          * Returns:
 104          *
 105          * 0 on success, a negative error code on failure, which will be
 106          * promoted to userspace as the result of the open() system call.
 107          */
 108         int (*open) (struct drm_device *, struct drm_file *);
 109
 110         /**
 111          * @postclose:
 112          *
 113          * One of the driver callbacks when a new &struct drm_file is closed.
 114          * Useful for tearing down driver-private data structures allocated in
 115          * @open like buffer allocators, execution contexts or similar things.
 116          *
 117          * Since the display/modeset side of DRM can only be owned by exactly
 118          * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
 119          * there should never be a need to tear down any modeset related
 120          * resources in this callback. Doing so would be a driver design bug.
 121          */
 122         void (*postclose) (struct drm_device *, struct drm_file *);
 123
 124         /**
 125          * @lastclose:
 126          *
 127          * Called when the last &struct drm_file has been closed and there's
 128          * currently no userspace client for the &struct drm_device.
 129          *
 130          * Modern drivers should only use this to force-restore the fbdev
 131          * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
 132          * Anything else would indicate there's something seriously wrong.
 133          * Modern drivers can also use this to execute delayed power switching
 134          * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
 135          * infrastructure.
 136          *
 137          * This is called after @postclose hook has been called.
 138          *
 139          * NOTE:
 140          *
 141          * All legacy drivers use this callback to de-initialize the hardware.
 142          * This is purely because of the shadow-attach model, where the DRM
 143          * kernel driver does not really own the hardware. Instead ownershipe is
 144          * handled with the help of userspace through an inheritedly racy dance
 145          * to set/unset the VT into raw mode.
 146          *
 147          * Legacy drivers initialize the hardware in the @firstopen callback,
 148          * which isn't even called for modern drivers.
 149          */
 150         void (*lastclose) (struct drm_device *);
 151
 152         /**
 153          * @unload:
 154          *
 155          * Reverse the effects of the driver load callback.  Ideally,
 156          * the clean up performed by the driver should happen in the
 157          * reverse order of the initialization.  Similarly to the load
 158          * hook, this handler is deprecated and its usage should be
 159          * dropped in favor of an open-coded teardown function at the
 160          * driver layer.  See drm_dev_unregister() and drm_dev_put()
 161          * for the proper way to remove a &struct drm_device.
 162          *
 163          * The unload() hook is called right after unregistering
 164          * the device.
 165          *
 166          */
 167         void (*unload) (struct drm_device *);
 168
 169         /**
 170          * @release:
 171          *
 172          * Optional callback for destroying device data after the final
 173          * reference is released, i.e. the device is being destroyed. Drivers
 174          * using this callback are responsible for calling drm_dev_fini()
 175          * to finalize the device and then freeing the struct themselves.
 176          */
 177         void (*release) (struct drm_device *);
 178
 179         /**
 180          * @get_vblank_counter:
 181          *
 182          * Driver callback for fetching a raw hardware vblank counter for the
 183          * CRTC specified with the pipe argument.  If a device doesn't have a
 184          * hardware counter, the driver can simply leave the hook as NULL.
 185          * The DRM core will account for missed vblank events while interrupts
 186          * where disabled based on system timestamps.
 187          *
 188          * Wraparound handling and loss of events due to modesetting is dealt
 189          * with in the DRM core code, as long as drivers call
 190          * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
 191          * enabling a CRTC.
 192          *
 193          * This is deprecated and should not be used by new drivers.
 194          * Use &drm_crtc_funcs.get_vblank_counter instead.
 195          *
 196          * Returns:
 197          *
 198          * Raw vblank counter value.
 199          */
 200         u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);
 201
 202         /**
 203          * @enable_vblank:
 204          *
 205          * Enable vblank interrupts for the CRTC specified with the pipe
 206          * argument.
 207          *
 208          * This is deprecated and should not be used by new drivers.
 209          * Use &drm_crtc_funcs.enable_vblank instead.
 210          *
 211          * Returns:
 212          *
 213          * Zero on success, appropriate errno if the given @crtc's vblank
 214          * interrupt cannot be enabled.
 215          */
 216         int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);
 217
 218         /**
 219          * @disable_vblank:
 220          *
 221          * Disable vblank interrupts for the CRTC specified with the pipe
 222          * argument.
 223          *
 224          * This is deprecated and should not be used by new drivers.
 225          * Use &drm_crtc_funcs.disable_vblank instead.
 226          */
 227         void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);
 228
 229         /**
 230          * @get_scanout_position:
 231          *
 232          * Called by vblank timestamping code.
 233          *
 234          * Returns the current display scanout position from a crtc, and an
 235          * optional accurate ktime_get() timestamp of when position was
 236          * measured. Note that this is a helper callback which is only used if a
 237          * driver uses drm_calc_vbltimestamp_from_scanoutpos() for the
 238          * @get_vblank_timestamp callback.
 239          *
 240          * Parameters:
 241          *
 242          * dev:
 243          *     DRM device.
 244          * pipe:
 245          *     Id of the crtc to query.
 246          * in_vblank_irq:
 247          *     True when called from drm_crtc_handle_vblank().  Some drivers
 248          *     need to apply some workarounds for gpu-specific vblank irq quirks
 249          *     if flag is set.
 250          * vpos:
 251          *     Target location for current vertical scanout position.
 252          * hpos:
 253          *     Target location for current horizontal scanout position.
 254          * stime:
 255          *     Target location for timestamp taken immediately before
 256          *     scanout position query. Can be NULL to skip timestamp.
 257          * etime:
 258          *     Target location for timestamp taken immediately after
 259          *     scanout position query. Can be NULL to skip timestamp.
 260          * mode:
 261          *     Current display timings.
 262          *
 263          * Returns vpos as a positive number while in active scanout area.
 264          * Returns vpos as a negative number inside vblank, counting the number
 265          * of scanlines to go until end of vblank, e.g., -1 means "one scanline
 266          * until start of active scanout / end of vblank."
 267          *
 268          * Returns:
 269          *
 270          * True on success, false if a reliable scanout position counter could
 271          * not be read out.
 272          *
 273          * FIXME:
 274          *
 275          * Since this is a helper to implement @get_vblank_timestamp, we should
 276          * move it to &struct drm_crtc_helper_funcs, like all the other
 277          * helper-internal hooks.
 278          */
 279         bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
 280                                       bool in_vblank_irq, int *vpos, int *hpos,
 281                                       ktime_t *stime, ktime_t *etime,
 282                                       const struct drm_display_mode *mode);
 283
 284         /**
 285          * @get_vblank_timestamp:
 286          *
 287          * Called by drm_get_last_vbltimestamp(). Should return a precise
 288          * timestamp when the most recent VBLANK interval ended or will end.
 289          *
 290          * Specifically, the timestamp in @vblank_time should correspond as
 291          * closely as possible to the time when the first video scanline of
 292          * the video frame after the end of VBLANK will start scanning out,
 293          * the time immediately after end of the VBLANK interval. If the
 294          * @crtc is currently inside VBLANK, this will be a time in the future.
 295          * If the @crtc is currently scanning out a frame, this will be the
 296          * past start time of the current scanout. This is meant to adhere
 297          * to the OpenML OML_sync_control extension specification.
 298          *
 299          * Paramters:
 300          *
 301          * dev:
 302          *     dev DRM device handle.
 303          * pipe:
 304          *     crtc for which timestamp should be returned.
 305          * max_error:
 306          *     Maximum allowable timestamp error in nanoseconds.
 307          *     Implementation should strive to provide timestamp
 308          *     with an error of at most max_error nanoseconds.
 309          *     Returns true upper bound on error for timestamp.
 310          * vblank_time:
 311          *     Target location for returned vblank timestamp.
 312          * in_vblank_irq:
 313          *     True when called from drm_crtc_handle_vblank().  Some drivers
 314          *     need to apply some workarounds for gpu-specific vblank irq quirks
 315          *     if flag is set.
 316          *
 317          * Returns:
 318          *
 319          * True on success, false on failure, which means the core should
 320          * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
 321          *
 322          * FIXME:
 323          *
 324          * We should move this hook to &struct drm_crtc_funcs like all the other
 325          * vblank hooks.
 326          */
 327         bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
 328                                      int *max_error,
 329                                      ktime_t *vblank_time,
 330                                      bool in_vblank_irq);
 331
 332         /**
 333          * @irq_handler:
 334          *
 335          * Interrupt handler called when using drm_irq_install(). Not used by
 336          * drivers which implement their own interrupt handling.
 337          */
 338         irqreturn_t(*irq_handler) (int irq, void *arg);
 339
 340         /**
 341          * @irq_preinstall:
 342          *
 343          * Optional callback used by drm_irq_install() which is called before
 344          * the interrupt handler is registered. This should be used to clear out
 345          * any pending interrupts (from e.g. firmware based drives) and reset
 346          * the interrupt handling registers.
 347          */
 348         void (*irq_preinstall) (struct drm_device *dev);
 349
 350         /**
 351          * @irq_postinstall:
 352          *
 353          * Optional callback used by drm_irq_install() which is called after
 354          * the interrupt handler is registered. This should be used to enable
 355          * interrupt generation in the hardware.
 356          */
 357         int (*irq_postinstall) (struct drm_device *dev);
 358
 359         /**
 360          * @irq_uninstall:
 361          *
 362          * Optional callback used by drm_irq_uninstall() which is called before
 363          * the interrupt handler is unregistered. This should be used to disable
 364          * interrupt generation in the hardware.
 365          */
 366         void (*irq_uninstall) (struct drm_device *dev);
 367
 368         /**
 369          * @master_create:
 370          *
 371          * Called whenever a new master is created. Only used by vmwgfx.
 372          */
 373         int (*master_create)(struct drm_device *dev, struct drm_master *master);
 374
 375         /**
 376          * @master_destroy:
 377          *
 378          * Called whenever a master is destroyed. Only used by vmwgfx.
 379          */
 380         void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
 381
 382         /**
 383          * @master_set:
 384          *
 385          * Called whenever the minor master is set. Only used by vmwgfx.
 386          */
 387         int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
 388                           bool from_open);
 389         /**
 390          * @master_drop:
 391          *
 392          * Called whenever the minor master is dropped. Only used by vmwgfx.
 393          */
 394         void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
 395
 396         /**
 397          * @debugfs_init:
 398          *
 399          * Allows drivers to create driver-specific debugfs files.
 400          */
 401         int (*debugfs_init)(struct drm_minor *minor);
 402
 403         /**
 404          * @gem_free_object: deconstructor for drm_gem_objects
 405          *
 406          * This is deprecated and should not be used by new drivers. Use
 407          * @gem_free_object_unlocked instead.
 408          */
 409         void (*gem_free_object) (struct drm_gem_object *obj);
 410
 411         /**
 412          * @gem_free_object_unlocked: deconstructor for drm_gem_objects
 413          *
 414          * This is for drivers which are not encumbered with &drm_device.struct_mutex
 415          * legacy locking schemes. Use this hook instead of @gem_free_object.
 416          */
 417         void (*gem_free_object_unlocked) (struct drm_gem_object *obj);
 418
 419         /**
 420          * @gem_open_object:
 421          *
 422          * Driver hook called upon gem handle creation
 423          */
 424         int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
 425
 426         /**
 427          * @gem_close_object:
 428          *
 429          * Driver hook called upon gem handle release
 430          */
 431         void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);
 432
 433         /**
 434          * @gem_print_info:
 435          *
 436          * If driver subclasses struct &drm_gem_object, it can implement this
 437          * optional hook for printing additional driver specific info.
 438          *
 439          * drm_printf_indent() should be used in the callback passing it the
 440          * indent argument.
 441          *
 442          * This callback is called from drm_gem_print_info().
 443          */
 444         void (*gem_print_info)(struct drm_printer *p, unsigned int indent,
 445                                const struct drm_gem_object *obj);
 446
 447         /**
 448          * @gem_create_object: constructor for gem objects
 449          *
 450          * Hook for allocating the GEM object struct, for use by core
 451          * helpers.
 452          */
 453         struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
 454                                                     size_t size);
 455
 456         /* prime: */
 457         /**
 458          * @prime_handle_to_fd:
 459          *
 460          * export handle -> fd (see drm_gem_prime_handle_to_fd() helper)
 461          */
 462         int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
 463                                 uint32_t handle, uint32_t flags, int *prime_fd);
 464         /**
 465          * @prime_fd_to_handle:
 466          *
 467          * import fd -> handle (see drm_gem_prime_fd_to_handle() helper)
 468          */
 469         int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
 470                                 int prime_fd, uint32_t *handle);
 471         /**
 472          * @gem_prime_export:
 473          *
 474          * export GEM -> dmabuf
 475          */
 476         struct dma_buf * (*gem_prime_export)(struct drm_device *dev,
 477                                 struct drm_gem_object *obj, int flags);
 478         /**
 479          * @gem_prime_import:
 480          *
 481          * import dmabuf -> GEM
 482          */
 483         struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
 484                                 struct dma_buf *dma_buf);
 485         int (*gem_prime_pin)(struct drm_gem_object *obj);
 486         void (*gem_prime_unpin)(struct drm_gem_object *obj);
 487         struct reservation_object * (*gem_prime_res_obj)(
 488                                 struct drm_gem_object *obj);
 489         struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
 490         struct drm_gem_object *(*gem_prime_import_sg_table)(
 491                                 struct drm_device *dev,
 492                                 struct dma_buf_attachment *attach,
 493                                 struct sg_table *sgt);
 494         void *(*gem_prime_vmap)(struct drm_gem_object *obj);
 495         void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
 496         int (*gem_prime_mmap)(struct drm_gem_object *obj,
 497                                 struct vm_area_struct *vma);
 498
 499         /**
 500          * @dumb_create:
 501          *
 502          * This creates a new dumb buffer in the driver's backing storage manager (GEM,
 503          * TTM or something else entirely) and returns the resulting buffer handle. This
 504          * handle can then be wrapped up into a framebuffer modeset object.
 505          *
 506          * Note that userspace is not allowed to use such objects for render
 507          * acceleration - drivers must create their own private ioctls for such a use
 508          * case.
 509          *
 510          * Width, height and depth are specified in the &drm_mode_create_dumb
 511          * argument. The callback needs to fill the handle, pitch and size for
 512          * the created buffer.
 513          *
 514          * Called by the user via ioctl.
 515          *
 516          * Returns:
 517          *
 518          * Zero on success, negative errno on failure.
 519          */
 520         int (*dumb_create)(struct drm_file *file_priv,
 521                            struct drm_device *dev,
 522                            struct drm_mode_create_dumb *args);
 523         /**
 524          * @dumb_map_offset:
 525          *
 526          * Allocate an offset in the drm device node's address space to be able to
 527          * memory map a dumb buffer. GEM-based drivers must use
 528          * drm_gem_create_mmap_offset() to implement this.
 529          *
 530          * Called by the user via ioctl.
 531          *
 532          * Returns:
 533          *
 534          * Zero on success, negative errno on failure.
 535          */
 536         int (*dumb_map_offset)(struct drm_file *file_priv,
 537                                struct drm_device *dev, uint32_t handle,
 538                                uint64_t *offset);
 539         /**
 540          * @dumb_destroy:
 541          *
 542          * This destroys the userspace handle for the given dumb backing storage buffer.
 543          * Since buffer objects must be reference counted in the kernel a buffer object
 544          * won't be immediately freed if a framebuffer modeset object still uses it.
 545          *
 546          * Called by the user via ioctl.
 547          *
 548          * Returns:
 549          *
 550          * Zero on success, negative errno on failure.
 551          */
 552         int (*dumb_destroy)(struct drm_file *file_priv,
 553                             struct drm_device *dev,
 554                             uint32_t handle);
 555
 556         /**
 557          * @gem_vm_ops: Driver private ops for this object
 558          */
 559         const struct vm_operations_struct *gem_vm_ops;
 560
 561         /** @major: driver major number */
 562         int major;
 563         /** @minor: driver minor number */
 564         int minor;
 565         /** @patchlevel: driver patch level */
 566         int patchlevel;
 567         /** @name: driver name */
 568         char *name;
 569         /** @desc: driver description */
 570         char *desc;
 571         /** @date: driver date */
 572         char *date;
 573
 574         /** @driver_features: driver features */
 575         u32 driver_features;
 576
 577         /**
 578          * @ioctls:
 579          *
 580          * Array of driver-private IOCTL description entries. See the chapter on
 581          * :ref:`IOCTL support in the userland interfaces
 582          * chapter<drm_driver_ioctl>` for the full details.
 583          */
 584
 585         const struct drm_ioctl_desc *ioctls;
 586         /** @num_ioctls: Number of entries in @ioctls. */
 587         int num_ioctls;
 588
 589         /**
 590          * @fops:
 591          *
 592          * File operations for the DRM device node. See the discussion in
 593          * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
 594          * some examples.
 595          */
 596         const struct file_operations *fops;
 597
 598         /* Everything below here is for legacy driver, never use! */
 599         /* private: */
 600
 601         /* List of devices hanging off this driver with stealth attach. */
 602         struct list_head legacy_dev_list;
 603         int (*firstopen) (struct drm_device *);
 604         void (*preclose) (struct drm_device *, struct drm_file *file_priv);
 605         int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
 606         int (*dma_quiescent) (struct drm_device *);
 607         int (*context_dtor) (struct drm_device *dev, int context);
 608         int dev_priv_size;
 609 };
 610
 611 extern unsigned int drm_debug;
 612
 613 int drm_dev_init(struct drm_device *dev,
 614                  struct drm_driver *driver,
 615                  struct device *parent);
 616 void drm_dev_fini(struct drm_device *dev);
 617
 618 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
 619                                  struct device *parent);
 620 int drm_dev_register(struct drm_device *dev, unsigned long flags);
 621 void drm_dev_unregister(struct drm_device *dev);
 622
 623 void drm_dev_get(struct drm_device *dev);
 624 void drm_dev_put(struct drm_device *dev);
 625 void drm_dev_unref(struct drm_device *dev);
 626 void drm_put_dev(struct drm_device *dev);
 627 bool drm_dev_enter(struct drm_device *dev, int *idx);
 628 void drm_dev_exit(int idx);
 629 void drm_dev_unplug(struct drm_device *dev);
 630
 631 /**
 632  * drm_dev_is_unplugged - is a DRM device unplugged
 633  * @dev: DRM device
 634  *
 635  * This function can be called to check whether a hotpluggable is unplugged.
 636  * Unplugging itself is singalled through drm_dev_unplug(). If a device is
 637  * unplugged, these two functions guarantee that any store before calling
 638  * drm_dev_unplug() is visible to callers of this function after it completes
 639  */
 640 static inline bool drm_dev_is_unplugged(struct drm_device *dev)
 641 {
 642         int idx;
 643
 644         if (drm_dev_enter(dev, &idx)) {
 645                 drm_dev_exit(idx);
 646                 return false;
 647         }
 648
 649         return true;
 650 }
 651
 652
 653 int drm_dev_set_unique(struct drm_device *dev, const char *name);
 654
 655
 656 #endif