text: /*
   * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   * Copyright (c) 2009-2010, Code Aurora Forum.
   * Copyright 2016 Intel Corp.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
   * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   * OTHER DEALINGS IN THE SOFTWARE.
   */
  
  #ifndef _DRM_DRV_H_
  #define _DRM_DRV_H_
  
  #include <linux/list.h>
  #include <linux/irqreturn.h>
  
  #include <drm/drm_device.h>
  
  struct drm_file;
  struct drm_gem_object;
  struct drm_master;
  struct drm_minor;
  struct dma_buf_attachment;
  struct drm_display_mode;
  struct drm_mode_create_dumb;
  struct drm_printer;
  
  /* driver capabilities and requirements mask */
  #define DRIVER_USE_AGP			0x1
  #define DRIVER_LEGACY			0x2
  #define DRIVER_PCI_DMA			0x8
  #define DRIVER_SG			0x10
  #define DRIVER_HAVE_DMA			0x20
  #define DRIVER_HAVE_IRQ			0x40
  #define DRIVER_IRQ_SHARED		0x80
  #define DRIVER_GEM			0x1000
  #define DRIVER_MODESET			0x2000
  #define DRIVER_PRIME			0x4000
  #define DRIVER_RENDER			0x8000
  #define DRIVER_ATOMIC			0x10000
  #define DRIVER_KMS_LEGACY_CONTEXT	0x20000
  #define DRIVER_SYNCOBJ                  0x40000
  
  /**
   * struct drm_driver - DRM driver structure
   *
   * This structure represent the common code for a family of cards. There will
   * one drm_device for each card present in this family. It contains lots of
   * vfunc entries, and a pile of those probably should be moved to more
   * appropriate places like &drm_mode_config_funcs or into a new operations
   * structure for GEM drivers.
   */
  struct drm_driver {
  	/**
  	 * @load:
  	 *
  	 * Backward-compatible driver callback to complete
  	 * initialization steps after the driver is registered.  For
  	 * this reason, may suffer from race conditions and its use is
  	 * deprecated for new drivers.  It is therefore only supported
  	 * for existing drivers not yet converted to the new scheme.
  	 * See drm_dev_init() and drm_dev_register() for proper and
  	 * race-free way to set up a &struct drm_device.
  	 *
  	 * This is deprecated, do not use!
  	 *
  	 * Returns:
  	 *
  	 * Zero on success, non-zero value on failure.
  	 */
  	int (*load) (struct drm_device *, unsigned long flags);
  
  	/**
  	 * @open:
  	 *
  	 * Driver callback when a new &struct drm_file is opened. Useful for
  	 * setting up driver-private data structures like buffer allocators,
  	 * execution contexts or similar things. Such driver-private resources
  	 * must be released again in @postclose.
  	 *
  	 * Since the display/modeset side of DRM can only be owned by exactly
  	 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
  	 * there should never be a need to set up any modeset related resources
  	 * in this callback. Doing so would be a driver design bug.
  	 *
  	 * Returns:
  	 *
  	 * 0 on success, a negative error code on failure, which will be
  	 * promoted to userspace as the result of the open() system call.
  	 */
  	int (*open) (struct drm_device *, struct drm_file *);
  
  	/**
  	 * @postclose:
  	 *
  	 * One of the driver callbacks when a new &struct drm_file is closed.
  	 * Useful for tearing down driver-private data structures allocated in
  	 * @open like buffer allocators, execution contexts or similar things.
  	 *
  	 * Since the display/modeset side of DRM can only be owned by exactly
  	 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
  	 * there should never be a need to tear down any modeset related
  	 * resources in this callback. Doing so would be a driver design bug.
  	 */
  	void (*postclose) (struct drm_device *, struct drm_file *);
  
  	/**
  	 * @lastclose:
  	 *
  	 * Called when the last &struct drm_file has been closed and there's
  	 * currently no userspace client for the &struct drm_device.
  	 *
  	 * Modern drivers should only use this to force-restore the fbdev
  	 * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
  	 * Anything else would indicate there's something seriously wrong.
  	 * Modern drivers can also use this to execute delayed power switching
  	 * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
  	 * infrastructure.
  	 *
  	 * This is called after @postclose hook has been called.
  	 *
  	 * NOTE:
  	 *
  	 * All legacy drivers use this callback to de-initialize the hardware.
  	 * This is purely because of the shadow-attach model, where the DRM
  	 * kernel driver does not really own the hardware. Instead ownershipe is
  	 * handled with the help of userspace through an inheritedly racy dance
  	 * to set/unset the VT into raw mode.
  	 *
  	 * Legacy drivers initialize the hardware in the @firstopen callback,
  	 * which isn't even called for modern drivers.
  	 */
  	void (*lastclose) (struct drm_device *);
  
  	/**
  	 * @unload:
  	 *
  	 * Reverse the effects of the driver load callback.  Ideally,
  	 * the clean up performed by the driver should happen in the
  	 * reverse order of the initialization.  Similarly to the load
  	 * hook, this handler is deprecated and its usage should be
  	 * dropped in favor of an open-coded teardown function at the
  	 * driver layer.  See drm_dev_unregister() and drm_dev_put()
  	 * for the proper way to remove a &struct drm_device.
  	 *
  	 * The unload() hook is called right after unregistering
  	 * the device.
  	 *
  	 */
  	void (*unload) (struct drm_device *);
  
  	/**
  	 * @release:
  	 *
  	 * Optional callback for destroying device data after the final
  	 * reference is released, i.e. the device is being destroyed. Drivers
  	 * using this callback are responsible for calling drm_dev_fini()
  	 * to finalize the device and then freeing the struct themselves.
  	 */
  	void (*release) (struct drm_device *);
  
  	/**
  	 * @get_vblank_counter:
  	 *
  	 * Driver callback for fetching a raw hardware vblank counter for the
  	 * CRTC specified with the pipe argument.  If a device doesn't have a
  	 * hardware counter, the driver can simply leave the hook as NULL.
  	 * The DRM core will account for missed vblank events while interrupts
  	 * where disabled based on system timestamps.
  	 *
  	 * Wraparound handling and loss of events due to modesetting is dealt
  	 * with in the DRM core code, as long as drivers call
  	 * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
  	 * enabling a CRTC.
  	 *
  	 * This is deprecated and should not be used by new drivers.
  	 * Use &drm_crtc_funcs.get_vblank_counter instead.
  	 *
  	 * Returns:
  	 *
  	 * Raw vblank counter value.
  	 */
  	u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);
  
  	/**
  	 * @enable_vblank:
  	 *
  	 * Enable vblank interrupts for the CRTC specified with the pipe
  	 * argument.
  	 *
  	 * This is deprecated and should not be used by new drivers.
  	 * Use &drm_crtc_funcs.enable_vblank instead.
  	 *
  	 * Returns:
  	 *
  	 * Zero on success, appropriate errno if the given @crtc's vblank
  	 * interrupt cannot be enabled.
  	 */
  	int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);
  
  	/**
  	 * @disable_vblank:
  	 *
  	 * Disable vblank interrupts for the CRTC specified with the pipe
  	 * argument.
  	 *
  	 * This is deprecated and should not be used by new drivers.
  	 * Use &drm_crtc_funcs.disable_vblank instead.
  	 */
  	void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);
  
  	/**
  	 * @get_scanout_position:
  	 *
  	 * Called by vblank timestamping code.
  	 *
  	 * Returns the current display scanout position from a crtc, and an
  	 * optional accurate ktime_get() timestamp of when position was
  	 * measured. Note that this is a helper callback which is only used if a
  	 * driver uses drm_calc_vbltimestamp_from_scanoutpos() for the
  	 * @get_vblank_timestamp callback.
  	 *
  	 * Parameters:
  	 *
  	 * dev:
  	 *     DRM device.
  	 * pipe:
  	 *     Id of the crtc to query.
  	 * in_vblank_irq:
  	 *     True when called from drm_crtc_handle_vblank().  Some drivers
  	 *     need to apply some workarounds for gpu-specific vblank irq quirks
  	 *     if flag is set.
  	 * vpos:
  	 *     Target location for current vertical scanout position.
  	 * hpos:
  	 *     Target location for current horizontal scanout position.
  	 * stime:
  	 *     Target location for timestamp taken immediately before
  	 *     scanout position query. Can be NULL to skip timestamp.
  	 * etime:
  	 *     Target location for timestamp taken immediately after
  	 *     scanout position query. Can be NULL to skip timestamp.
  	 * mode:
  	 *     Current display timings.
  	 *
  	 * Returns vpos as a positive number while in active scanout area.
  	 * Returns vpos as a negative number inside vblank, counting the number
  	 * of scanlines to go until end of vblank, e.g., -1 means "one scanline
  	 * until start of active scanout / end of vblank."
  	 *
  	 * Returns:
  	 *
  	 * True on success, false if a reliable scanout position counter could
  	 * not be read out.
  	 *
  	 * FIXME:
  	 *
  	 * Since this is a helper to implement @get_vblank_timestamp, we should
  	 * move it to &struct drm_crtc_helper_funcs, like all the other
  	 * helper-internal hooks.
  	 */
  	bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
  				      bool in_vblank_irq, int *vpos, int *hpos,
  				      ktime_t *stime, ktime_t *etime,
  				      const struct drm_display_mode *mode);
  
  	/**
  	 * @get_vblank_timestamp:
  	 *
  	 * Called by drm_get_last_vbltimestamp(). Should return a precise
  	 * timestamp when the most recent VBLANK interval ended or will end.
  	 *
  	 * Specifically, the timestamp in @vblank_time should correspond as
  	 * closely as possible to the time when the first video scanline of
  	 * the video frame after the end of VBLANK will start scanning out,
  	 * the time immediately after end of the VBLANK interval. If the
  	 * @crtc is currently inside VBLANK, this will be a time in the future.
  	 * If the @crtc is currently scanning out a frame, this will be the
  	 * past start time of the current scanout. This is meant to adhere
  	 * to the OpenML OML_sync_control extension specification.
  	 *
  	 * Paramters:
  	 *
  	 * dev:
  	 *     dev DRM device handle.
  	 * pipe:
  	 *     crtc for which timestamp should be returned.
  	 * max_error:
  	 *     Maximum allowable timestamp error in nanoseconds.
  	 *     Implementation should strive to provide timestamp
  	 *     with an error of at most max_error nanoseconds.
  	 *     Returns true upper bound on error for timestamp.
  	 * vblank_time:
  	 *     Target location for returned vblank timestamp.
  	 * in_vblank_irq:
  	 *     True when called from drm_crtc_handle_vblank().  Some drivers
  	 *     need to apply some workarounds for gpu-specific vblank irq quirks
  	 *     if flag is set.
  	 *
  	 * Returns:
  	 *
  	 * True on success, false on failure, which means the core should
  	 * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
  	 *
  	 * FIXME:
  	 *
  	 * We should move this hook to &struct drm_crtc_funcs like all the other
  	 * vblank hooks.
  	 */
  	bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
  				     int *max_error,
  				     ktime_t *vblank_time,
  				     bool in_vblank_irq);
  
  	/**
  	 * @irq_handler:
  	 *
  	 * Interrupt handler called when using drm_irq_install(). Not used by
  	 * drivers which implement their own interrupt handling.
  	 */
  	irqreturn_t(*irq_handler) (int irq, void *arg);
  
  	/**
  	 * @irq_preinstall:
  	 *
  	 * Optional callback used by drm_irq_install() which is called before
  	 * the interrupt handler is registered. This should be used to clear out
  	 * any pending interrupts (from e.g. firmware based drives) and reset
  	 * the interrupt handling registers.
  	 */
  	void (*irq_preinstall) (struct drm_device *dev);
  
  	/**
  	 * @irq_postinstall:
  	 *
  	 * Optional callback used by drm_irq_install() which is called after
  	 * the interrupt handler is registered. This should be used to enable
  	 * interrupt generation in the hardware.
  	 */
  	int (*irq_postinstall) (struct drm_device *dev);
  
  	/**
  	 * @irq_uninstall:
  	 *
  	 * Optional callback used by drm_irq_uninstall() which is called before
  	 * the interrupt handler is unregistered. This should be used to disable
  	 * interrupt generation in the hardware.
  	 */
  	void (*irq_uninstall) (struct drm_device *dev);
  
  	/**
  	 * @master_create:
  	 *
  	 * Called whenever a new master is created. Only used by vmwgfx.
  	 */
  	int (*master_create)(struct drm_device *dev, struct drm_master *master);
  
  	/**
  	 * @master_destroy:
  	 *
  	 * Called whenever a master is destroyed. Only used by vmwgfx.
  	 */
  	void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
  
  	/**
  	 * @master_set:
  	 *
  	 * Called whenever the minor master is set. Only used by vmwgfx.
  	 */
  	int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
  			  bool from_open);
  	/**
  	 * @master_drop:
  	 *
  	 * Called whenever the minor master is dropped. Only used by vmwgfx.
  	 */
  	void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
  
  	/**
  	 * @debugfs_init:
  	 *
  	 * Allows drivers to create driver-specific debugfs files.
  	 */
  	int (*debugfs_init)(struct drm_minor *minor);
  
  	/**
  	 * @gem_free_object: deconstructor for drm_gem_objects
  	 *
  	 * This is deprecated and should not be used by new drivers. Use
  	 * @gem_free_object_unlocked instead.
  	 */
  	void (*gem_free_object) (struct drm_gem_object *obj);
  
  	/**
  	 * @gem_free_object_unlocked: deconstructor for drm_gem_objects
  	 *
  	 * This is for drivers which are not encumbered with &drm_device.struct_mutex
  	 * legacy locking schemes. Use this hook instead of @gem_free_object.
  	 */
  	void (*gem_free_object_unlocked) (struct drm_gem_object *obj);
  
  	/**
  	 * @gem_open_object:
  	 *
  	 * Driver hook called upon gem handle creation
  	 */
  	int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
  
  	/**
  	 * @gem_close_object:
  	 *
  	 * Driver hook called upon gem handle release
  	 */
  	void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);
  
  	/**
  	 * @gem_print_info:
  	 *
  	 * If driver subclasses struct &drm_gem_object, it can implement this
  	 * optional hook for printing additional driver specific info.
  	 *
  	 * drm_printf_indent() should be used in the callback passing it the
  	 * indent argument.
  	 *
  	 * This callback is called from drm_gem_print_info().
  	 */
  	void (*gem_print_info)(struct drm_printer *p, unsigned int indent,
  			       const struct drm_gem_object *obj);
  
  	/**
  	 * @gem_create_object: constructor for gem objects
  	 *
  	 * Hook for allocating the GEM object struct, for use by core
  	 * helpers.
  	 */
  	struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
  						    size_t size);
  
  	/* prime: */
  	/**
  	 * @prime_handle_to_fd:
  	 *
  	 * export handle -> fd (see drm_gem_prime_handle_to_fd() helper)
  	 */
  	int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
  				uint32_t handle, uint32_t flags, int *prime_fd);
  	/**
  	 * @prime_fd_to_handle:
  	 *
  	 * import fd -> handle (see drm_gem_prime_fd_to_handle() helper)
  	 */
  	int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
  				int prime_fd, uint32_t *handle);
  	/**
  	 * @gem_prime_export:
  	 *
  	 * export GEM -> dmabuf
  	 *
  	 * This defaults to drm_gem_prime_export() if not set.
  	 */
  	struct dma_buf * (*gem_prime_export)(struct drm_device *dev,
  				struct drm_gem_object *obj, int flags);
  	/**
  	 * @gem_prime_import:
  	 *
  	 * import dmabuf -> GEM
  	 *
  	 * This defaults to drm_gem_prime_import() if not set.
  	 */
  	struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
  				struct dma_buf *dma_buf);
  	int (*gem_prime_pin)(struct drm_gem_object *obj);
  	void (*gem_prime_unpin)(struct drm_gem_object *obj);
  	struct reservation_object * (*gem_prime_res_obj)(
  				struct drm_gem_object *obj);
  	struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
  	struct drm_gem_object *(*gem_prime_import_sg_table)(
  				struct drm_device *dev,
  				struct dma_buf_attachment *attach,
  				struct sg_table *sgt);
  	void *(*gem_prime_vmap)(struct drm_gem_object *obj);
  	void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
  	int (*gem_prime_mmap)(struct drm_gem_object *obj,
  				struct vm_area_struct *vma);
  
  	/**
  	 * @dumb_create:
  	 *
  	 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
  	 * TTM or something else entirely) and returns the resulting buffer handle. This
  	 * handle can then be wrapped up into a framebuffer modeset object.
  	 *
  	 * Note that userspace is not allowed to use such objects for render
  	 * acceleration - drivers must create their own private ioctls for such a use
  	 * case.
  	 *
  	 * Width, height and depth are specified in the &drm_mode_create_dumb
  	 * argument. The callback needs to fill the handle, pitch and size for
  	 * the created buffer.
  	 *
  	 * Called by the user via ioctl.
  	 *
  	 * Returns:
  	 *
  	 * Zero on success, negative errno on failure.
  	 */
  	int (*dumb_create)(struct drm_file *file_priv,
  			   struct drm_device *dev,
  			   struct drm_mode_create_dumb *args);
  	/**
  	 * @dumb_map_offset:
  	 *
  	 * Allocate an offset in the drm device node's address space to be able to
  	 * memory map a dumb buffer.
  	 *
  	 * The default implementation is drm_gem_create_mmap_offset(). GEM based
  	 * drivers must not overwrite this.
  	 *
  	 * Called by the user via ioctl.
  	 *
  	 * Returns:
  	 *
  	 * Zero on success, negative errno on failure.
  	 */
  	int (*dumb_map_offset)(struct drm_file *file_priv,
  			       struct drm_device *dev, uint32_t handle,
  			       uint64_t *offset);
  	/**
  	 * @dumb_destroy:
  	 *
  	 * This destroys the userspace handle for the given dumb backing storage buffer.
  	 * Since buffer objects must be reference counted in the kernel a buffer object
  	 * won't be immediately freed if a framebuffer modeset object still uses it.
  	 *
  	 * Called by the user via ioctl.
  	 *
  	 * The default implementation is drm_gem_dumb_destroy(). GEM based drivers
  	 * must not overwrite this.
  	 *
  	 * Returns:
  	 *
  	 * Zero on success, negative errno on failure.
  	 */
  	int (*dumb_destroy)(struct drm_file *file_priv,
  			    struct drm_device *dev,
  			    uint32_t handle);
  
  	/**
  	 * @gem_vm_ops: Driver private ops for this object
  	 */
  	const struct vm_operations_struct *gem_vm_ops;
  
  	/** @major: driver major number */
  	int major;
  	/** @minor: driver minor number */
  	int minor;
  	/** @patchlevel: driver patch level */
  	int patchlevel;
  	/** @name: driver name */
  	char *name;
  	/** @desc: driver description */
  	char *desc;
  	/** @date: driver date */
  	char *date;
  
  	/** @driver_features: driver features */
  	u32 driver_features;
  
  	/**
  	 * @ioctls:
  	 *
  	 * Array of driver-private IOCTL description entries. See the chapter on
  	 * :ref:`IOCTL support in the userland interfaces
  	 * chapter<drm_driver_ioctl>` for the full details.
  	 */
  
  	const struct drm_ioctl_desc *ioctls;
  	/** @num_ioctls: Number of entries in @ioctls. */
  	int num_ioctls;
  
  	/**
  	 * @fops:
  	 *
  	 * File operations for the DRM device node. See the discussion in
  	 * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
  	 * some examples.
  	 */
  	const struct file_operations *fops;
  
  	/* Everything below here is for legacy driver, never use! */
  	/* private: */
  
  	/* List of devices hanging off this driver with stealth attach. */
  	struct list_head legacy_dev_list;
  	int (*firstopen) (struct drm_device *);
  	void (*preclose) (struct drm_device *, struct drm_file *file_priv);
  	int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
  	int (*dma_quiescent) (struct drm_device *);
  	int (*context_dtor) (struct drm_device *dev, int context);
  	int dev_priv_size;
  };
  
  extern unsigned int drm_debug;
  
  int drm_dev_init(struct drm_device *dev,
  		 struct drm_driver *driver,
  		 struct device *parent);
  void drm_dev_fini(struct drm_device *dev);
  
  struct drm_device *drm_dev_alloc(struct drm_driver *driver,
  				 struct device *parent);
  int drm_dev_register(struct drm_device *dev, unsigned long flags);
  void drm_dev_unregister(struct drm_device *dev);
  
  void drm_dev_get(struct drm_device *dev);
  void drm_dev_put(struct drm_device *dev);
  void drm_put_dev(struct drm_device *dev);
  bool drm_dev_enter(struct drm_device *dev, int *idx);
  void drm_dev_exit(int idx);
  void drm_dev_unplug(struct drm_device *dev);
  
  /**
   * drm_dev_is_unplugged - is a DRM device unplugged
   * @dev: DRM device
   *
   * This function can be called to check whether a hotpluggable is unplugged.
   * Unplugging itself is singalled through drm_dev_unplug(). If a device is
   * unplugged, these two functions guarantee that any store before calling
   * drm_dev_unplug() is visible to callers of this function after it completes
   */
  static inline bool drm_dev_is_unplugged(struct drm_device *dev)
  {
  	int idx;
  
  	if (drm_dev_enter(dev, &idx)) {
  		drm_dev_exit(idx);
  		return false;
  	}
  
  	return true;
  }
  
  /**
   * drm_core_check_feature - check driver feature flags
   * @dev: DRM device to check
   * @feature: feature flag
   *
   * This checks @dev for driver features, see &drm_driver.driver_features,
   * &drm_device.driver_features, and the various DRIVER_\* flags.
   *
   * Returns true if the @feature is supported, false otherwise.
   */
  static inline bool drm_core_check_feature(struct drm_device *dev, u32 feature)
  {
  	return dev->driver->driver_features & dev->driver_features & feature;
  }
  
  /**
   * drm_drv_uses_atomic_modeset - check if the driver implements
   * atomic_commit()
   * @dev: DRM device
   *
   * This check is useful if drivers do not have DRIVER_ATOMIC set but
   * have atomic modesetting internally implemented.
   */
  static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
  {
  	return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
  		(dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
  }
  
  
  int drm_dev_set_unique(struct drm_device *dev, const char *name);
  
  
  #endif
  