include/drm/drm_file.h - arm/linux - Git at Google

 /*
  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  * Copyright (c) 2009-2010, Code Aurora Forum.
  * All rights reserved.
  *
  * Author: Rickard E. (Rik) Faith <faith@valinux.com>
  * Author: Gareth Hughes <gareth@valinux.com>
  *
  * 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_FILE_H_
 #define _DRM_FILE_H_

 #include <linux/types.h>
 #include <linux/completion.h>

 #include <uapi/drm/drm.h>

 #include <drm/drm_prime.h>

 struct dma_fence;
 struct drm_file;
 struct drm_device;

 /*
  * FIXME: Not sure we want to have drm_minor here in the end, but to avoid
  * header include loops we need it here for now.
  */

 enum drm_minor_type {
 	DRM_MINOR_PRIMARY,
 	DRM_MINOR_CONTROL,
 	DRM_MINOR_RENDER,
 };

 /**
  * struct drm_minor - DRM device minor structure
  *
  * This structure represents a DRM minor number for device nodes in /dev.
  * Entirely opaque to drivers and should never be inspected directly by drivers.
  * Drivers instead should only interact with &struct drm_file and of course
  * &struct drm_device, which is also where driver-private data and resources can
  * be attached to.
  */
 struct drm_minor {
 	/* private: */
 	int index;			/* Minor device number */
 	int type;                       /* Control or render */
 	struct device *kdev;		/* Linux device */
 	struct drm_device *dev;

 	struct dentry *debugfs_root;

 	struct list_head debugfs_list;
 	struct mutex debugfs_lock; /* Protects debugfs_list. */
 };

 /**
  * struct drm_pending_event - Event queued up for userspace to read
  *
  * This represents a DRM event. Drivers can use this as a generic completion
  * mechanism, which supports kernel-internal &struct completion, &struct dma_fence
  * and also the DRM-specific &struct drm_event delivery mechanism.
  */
 struct drm_pending_event {
 	/**
 	 * @completion:
 	 *
 	 * Optional pointer to a kernel internal completion signalled when
 	 * drm_send_event() is called, useful to internally synchronize with
 	 * nonblocking operations.
 	 */
 	struct completion *completion;

 	/**
 	 * @completion_release:
 	 *
 	 * Optional callback currently only used by the atomic modeset helpers
 	 * to clean up the reference count for the structure @completion is
 	 * stored in.
 	 */
 	void (*completion_release)(struct completion *completion);

 	/**
 	 * @event:
 	 *
 	 * Pointer to the actual event that should be sent to userspace to be
 	 * read using drm_read(). Can be optional, since nowadays events are
 	 * also used to signal kernel internal threads with @completion or DMA
 	 * transactions using @fence.
 	 */
 	struct drm_event *event;

 	/**
 	 * @fence:
 	 *
 	 * Optional DMA fence to unblock other hardware transactions which
 	 * depend upon the nonblocking DRM operation this event represents.
 	 */
 	struct dma_fence *fence;

 	/**
 	 * @file_priv:
 	 *
 	 * &struct drm_file where @event should be delivered to. Only set when
 	 * @event is set.
 	 */
 	struct drm_file *file_priv;

 	/**
 	 * @link:
 	 *
 	 * Double-linked list to keep track of this event. Can be used by the
 	 * driver up to the point when it calls drm_send_event(), after that
 	 * this list entry is owned by the core for its own book-keeping.
 	 */
 	struct list_head link;

 	/**
 	 * @pending_link:
 	 *
 	 * Entry on &drm_file.pending_event_list, to keep track of all pending
 	 * events for @file_priv, to allow correct unwinding of them when
 	 * userspace closes the file before the event is delivered.
 	 */
 	struct list_head pending_link;
 };

 /**
  * struct drm_file - DRM file private data
  *
  * This structure tracks DRM state per open file descriptor.
  */
 struct drm_file {
 	/**
 	 * @authenticated:
 	 *
 	 * Whether the client is allowed to submit rendering, which for legacy
 	 * nodes means it must be authenticated.
 	 *
 	 * See also the :ref:`section on primary nodes and authentication
 	 * <drm_primary_node>`.
 	 */
 	unsigned authenticated :1;

 	/**
 	 * @stereo_allowed:
 	 *
 	 * True when the client has asked us to expose stereo 3D mode flags.
 	 */
 	unsigned stereo_allowed :1;

 	/**
 	 * @universal_planes:
 	 *
 	 * True if client understands CRTC primary planes and cursor planes
 	 * in the plane list. Automatically set when @atomic is set.
 	 */
 	unsigned universal_planes:1;

 	/** @atomic: True if client understands atomic properties. */
 	unsigned atomic:1;

 	/**
 	 * @is_master:
 	 *
 	 * This client is the creator of @master. Protected by struct
 	 * &drm_device.master_mutex.
 	 *
 	 * See also the :ref:`section on primary nodes and authentication
 	 * <drm_primary_node>`.
 	 */
 	unsigned is_master:1;

 	/**
 	 * @master:
 	 *
 	 * Master this node is currently associated with. Only relevant if
 	 * drm_is_primary_client() returns true. Note that this only
 	 * matches &drm_device.master if the master is the currently active one.
 	 *
 	 * See also @authentication and @is_master and the :ref:`section on
 	 * primary nodes and authentication <drm_primary_node>`.
 	 */
 	struct drm_master *master;

 	/** @pid: Process that opened this file. */
 	struct pid *pid;

 	/** @magic: Authentication magic, see @authenticated. */
 	drm_magic_t magic;

 	/**
 	 * @lhead:
 	 *
 	 * List of all open files of a DRM device, linked into
 	 * &drm_device.filelist. Protected by &drm_device.filelist_mutex.
 	 */
 	struct list_head lhead;

 	/** @minor: &struct drm_minor for this file. */
 	struct drm_minor *minor;

 	/**
 	 * @object_idr:
 	 *
 	 * Mapping of mm object handles to object pointers. Used by the GEM
 	 * subsystem. Protected by @table_lock.
 	 */
 	struct idr object_idr;

 	/** @table_lock: Protects @object_idr. */
 	spinlock_t table_lock;

 	/** @filp: Pointer to the core file structure. */
 	struct file *filp;

 	/**
 	 * @driver_priv:
 	 *
 	 * Optional pointer for driver private data. Can be allocated in
 	 * &drm_driver.open and should be freed in &drm_driver.postclose.
 	 */
 	void *driver_priv;

 	/**
 	 * @fbs:
 	 *
 	 * List of &struct drm_framebuffer associated with this file, using the
 	 * &drm_framebuffer.filp_head entry.
 	 *
 	 * Protected by @fbs_lock. Note that the @fbs list holds a reference on
 	 * the framebuffer object to prevent it from untimely disappearing.
 	 */
 	struct list_head fbs;

 	/** @fbs_lock: Protects @fbs. */
 	struct mutex fbs_lock;

 	/**
 	 * @blobs:
 	 *
 	 * User-created blob properties; this retains a reference on the
 	 * property.
 	 *
 	 * Protected by @drm_mode_config.blob_lock;
 	 */
 	struct list_head blobs;

 	/** @event_wait: Waitqueue for new events added to @event_list. */
 	wait_queue_head_t event_wait;

 	/**
 	 * @pending_event_list:
 	 *
 	 * List of pending &struct drm_pending_event, used to clean up pending
 	 * events in case this file gets closed before the event is signalled.
 	 * Uses the &drm_pending_event.pending_link entry.
 	 *
 	 * Protect by &drm_device.event_lock.
 	 */
 	struct list_head pending_event_list;

 	/**
 	 * @event_list:
 	 *
 	 * List of &struct drm_pending_event, ready for delivery to userspace
 	 * through drm_read(). Uses the &drm_pending_event.link entry.
 	 *
 	 * Protect by &drm_device.event_lock.
 	 */
 	struct list_head event_list;

 	/**
 	 * @event_space:
 	 *
 	 * Available event space to prevent userspace from
 	 * exhausting kernel memory. Currently limited to the fairly arbitrary
 	 * value of 4KB.
 	 */
 	int event_space;

 	/** @event_read_lock: Serializes drm_read(). */
 	struct mutex event_read_lock;

 	/**
 	 * @prime:
 	 *
 	 * Per-file buffer caches used by the PRIME buffer sharing code.
 	 */
 	struct drm_prime_file_private prime;

 	/* private: */
 	unsigned long lock_count; /* DRI1 legacy lock count */
 };

 /**
  * drm_is_primary_client - is this an open file of the primary node
  * @file_priv: DRM file
  *
  * Returns true if this is an open file of the primary node, i.e.
  * &drm_file.minor of @file_priv is a primary minor.
  *
  * See also the :ref:`section on primary nodes and authentication
  * <drm_primary_node>`.
  */
 static inline bool drm_is_primary_client(const struct drm_file *file_priv)
 {
 	return file_priv->minor->type == DRM_MINOR_PRIMARY;
 }

 /**
  * drm_is_render_client - is this an open file of the render node
  * @file_priv: DRM file
  *
  * Returns true if this is an open file of the render node, i.e.
  * &drm_file.minor of @file_priv is a render minor.
  *
  * See also the :ref:`section on render nodes <drm_render_node>`.
  */
 static inline bool drm_is_render_client(const struct drm_file *file_priv)
 {
 	return file_priv->minor->type == DRM_MINOR_RENDER;
 }

 /**
  * drm_is_control_client - is this an open file of the control node
  * @file_priv: DRM file
  *
  * Control nodes are deprecated and in the process of getting removed from the
  * DRM userspace API. Do not ever use!
  */
 static inline bool drm_is_control_client(const struct drm_file *file_priv)
 {
 	return file_priv->minor->type == DRM_MINOR_CONTROL;
 }

 int drm_open(struct inode *inode, struct file *filp);
 ssize_t drm_read(struct file *filp, char __user *buffer,
 		 size_t count, loff_t *offset);
 int drm_release(struct inode *inode, struct file *filp);
 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait);
 int drm_event_reserve_init_locked(struct drm_device *dev,
 				  struct drm_file *file_priv,
 				  struct drm_pending_event *p,
 				  struct drm_event *e);
 int drm_event_reserve_init(struct drm_device *dev,
 			   struct drm_file *file_priv,
 			   struct drm_pending_event *p,
 			   struct drm_event *e);
 void drm_event_cancel_free(struct drm_device *dev,
 			   struct drm_pending_event *p);
 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e);
 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);

 #endif /* _DRM_FILE_H_ */
	/*
	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	* Copyright (c) 2009-2010, Code Aurora Forum.
	* All rights reserved.
	*
	* Author: Rickard E. (Rik) Faith <faith@valinux.com>
	* Author: Gareth Hughes <gareth@valinux.com>
	*
	* 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_FILE_H_
	#define _DRM_FILE_H_

	#include <linux/types.h>
	#include <linux/completion.h>

	#include <uapi/drm/drm.h>

	#include <drm/drm_prime.h>

	struct dma_fence;
	struct drm_file;
	struct drm_device;

	/*
	* FIXME: Not sure we want to have drm_minor here in the end, but to avoid
	* header include loops we need it here for now.
	*/

	enum drm_minor_type {
	DRM_MINOR_PRIMARY,
	DRM_MINOR_CONTROL,
	DRM_MINOR_RENDER,
	};

	/**
	* struct drm_minor - DRM device minor structure
	*
	* This structure represents a DRM minor number for device nodes in /dev.
	* Entirely opaque to drivers and should never be inspected directly by drivers.
	* Drivers instead should only interact with &struct drm_file and of course
	* &struct drm_device, which is also where driver-private data and resources can
	* be attached to.
	*/
	struct drm_minor {
	/* private: */
	int index; /* Minor device number */
	int type; /* Control or render */
	struct device kdev; / Linux device */
	struct drm_device *dev;

	struct dentry *debugfs_root;

	struct list_head debugfs_list;
	struct mutex debugfs_lock; /* Protects debugfs_list. */
	};

	/**
	* struct drm_pending_event - Event queued up for userspace to read
	*
	* This represents a DRM event. Drivers can use this as a generic completion
	* mechanism, which supports kernel-internal &struct completion, &struct dma_fence
	* and also the DRM-specific &struct drm_event delivery mechanism.
	*/
	struct drm_pending_event {
	/**
	* @completion:
	*
	* Optional pointer to a kernel internal completion signalled when
	* drm_send_event() is called, useful to internally synchronize with
	* nonblocking operations.
	*/
	struct completion *completion;

	/**
	* @completion_release:
	*
	* Optional callback currently only used by the atomic modeset helpers
	* to clean up the reference count for the structure @completion is
	* stored in.
	*/
	void (completion_release)(struct completion completion);

	/**
	* @event:
	*
	* Pointer to the actual event that should be sent to userspace to be
	* read using drm_read(). Can be optional, since nowadays events are
	* also used to signal kernel internal threads with @completion or DMA
	* transactions using @fence.
	*/
	struct drm_event *event;

	/**
	* @fence:
	*
	* Optional DMA fence to unblock other hardware transactions which
	* depend upon the nonblocking DRM operation this event represents.
	*/
	struct dma_fence *fence;

	/**
	* @file_priv:
	*
	* &struct drm_file where @event should be delivered to. Only set when
	* @event is set.
	*/
	struct drm_file *file_priv;

	/**
	* @link:
	*
	* Double-linked list to keep track of this event. Can be used by the
	* driver up to the point when it calls drm_send_event(), after that
	* this list entry is owned by the core for its own book-keeping.
	*/
	struct list_head link;

	/**
	* @pending_link:
	*
	* Entry on &drm_file.pending_event_list, to keep track of all pending
	* events for @file_priv, to allow correct unwinding of them when
	* userspace closes the file before the event is delivered.
	*/
	struct list_head pending_link;
	};

	/**
	* struct drm_file - DRM file private data
	*
	* This structure tracks DRM state per open file descriptor.
	*/
	struct drm_file {
	/**
	* @authenticated:
	*
	* Whether the client is allowed to submit rendering, which for legacy
	* nodes means it must be authenticated.
	*
	* See also the :ref:`section on primary nodes and authentication
	* <drm_primary_node>`.
	*/
	unsigned authenticated :1;

	/**
	* @stereo_allowed:
	*
	* True when the client has asked us to expose stereo 3D mode flags.
	*/
	unsigned stereo_allowed :1;

	/**
	* @universal_planes:
	*
	* True if client understands CRTC primary planes and cursor planes
	* in the plane list. Automatically set when @atomic is set.
	*/
	unsigned universal_planes:1;

	/** @atomic: True if client understands atomic properties. */
	unsigned atomic:1;

	/**
	* @is_master:
	*
	* This client is the creator of @master. Protected by struct
	* &drm_device.master_mutex.
	*
	* See also the :ref:`section on primary nodes and authentication
	* <drm_primary_node>`.
	*/
	unsigned is_master:1;

	/**
	* @master:
	*
	* Master this node is currently associated with. Only relevant if
	* drm_is_primary_client() returns true. Note that this only
	* matches &drm_device.master if the master is the currently active one.
	*
	* See also @authentication and @is_master and the :ref:`section on
	* primary nodes and authentication <drm_primary_node>`.
	*/
	struct drm_master *master;

	/** @pid: Process that opened this file. */
	struct pid *pid;

	/** @magic: Authentication magic, see @authenticated. */
	drm_magic_t magic;

	/**
	* @lhead:
	*
	* List of all open files of a DRM device, linked into
	* &drm_device.filelist. Protected by &drm_device.filelist_mutex.
	*/
	struct list_head lhead;

	/** @minor: &struct drm_minor for this file. */
	struct drm_minor *minor;

	/**
	* @object_idr:
	*
	* Mapping of mm object handles to object pointers. Used by the GEM
	* subsystem. Protected by @table_lock.
	*/
	struct idr object_idr;

	/** @table_lock: Protects @object_idr. */
	spinlock_t table_lock;

	/** @filp: Pointer to the core file structure. */
	struct file *filp;

	/**
	* @driver_priv:
	*
	* Optional pointer for driver private data. Can be allocated in
	* &drm_driver.open and should be freed in &drm_driver.postclose.
	*/
	void *driver_priv;

	/**
	* @fbs:
	*
	* List of &struct drm_framebuffer associated with this file, using the
	* &drm_framebuffer.filp_head entry.
	*
	* Protected by @fbs_lock. Note that the @fbs list holds a reference on
	* the framebuffer object to prevent it from untimely disappearing.
	*/
	struct list_head fbs;

	/** @fbs_lock: Protects @fbs. */
	struct mutex fbs_lock;

	/**
	* @blobs:
	*
	* User-created blob properties; this retains a reference on the
	* property.
	*
	* Protected by @drm_mode_config.blob_lock;
	*/
	struct list_head blobs;

	/** @event_wait: Waitqueue for new events added to @event_list. */
	wait_queue_head_t event_wait;

	/**
	* @pending_event_list:
	*
	* List of pending &struct drm_pending_event, used to clean up pending
	* events in case this file gets closed before the event is signalled.
	* Uses the &drm_pending_event.pending_link entry.
	*
	* Protect by &drm_device.event_lock.
	*/
	struct list_head pending_event_list;

	/**
	* @event_list:
	*
	* List of &struct drm_pending_event, ready for delivery to userspace
	* through drm_read(). Uses the &drm_pending_event.link entry.
	*
	* Protect by &drm_device.event_lock.
	*/
	struct list_head event_list;

	/**
	* @event_space:
	*
	* Available event space to prevent userspace from
	* exhausting kernel memory. Currently limited to the fairly arbitrary
	* value of 4KB.
	*/
	int event_space;

	/** @event_read_lock: Serializes drm_read(). */
	struct mutex event_read_lock;

	/**
	* @prime:
	*
	* Per-file buffer caches used by the PRIME buffer sharing code.
	*/
	struct drm_prime_file_private prime;

	/* private: */
	unsigned long lock_count; /* DRI1 legacy lock count */
	};

	/**
	* drm_is_primary_client - is this an open file of the primary node
	* @file_priv: DRM file
	*
	* Returns true if this is an open file of the primary node, i.e.
	* &drm_file.minor of @file_priv is a primary minor.
	*
	* See also the :ref:`section on primary nodes and authentication
	* <drm_primary_node>`.
	*/
	static inline bool drm_is_primary_client(const struct drm_file *file_priv)
	{
	return file_priv->minor->type == DRM_MINOR_PRIMARY;
	}

	/**
	* drm_is_render_client - is this an open file of the render node
	* @file_priv: DRM file
	*
	* Returns true if this is an open file of the render node, i.e.
	* &drm_file.minor of @file_priv is a render minor.
	*
	* See also the :ref:`section on render nodes <drm_render_node>`.
	*/
	static inline bool drm_is_render_client(const struct drm_file *file_priv)
	{
	return file_priv->minor->type == DRM_MINOR_RENDER;
	}

	/**
	* drm_is_control_client - is this an open file of the control node
	* @file_priv: DRM file
	*
	* Control nodes are deprecated and in the process of getting removed from the
	* DRM userspace API. Do not ever use!
	*/
	static inline bool drm_is_control_client(const struct drm_file *file_priv)
	{
	return file_priv->minor->type == DRM_MINOR_CONTROL;
	}

	int drm_open(struct inode inode, struct file filp);
	ssize_t drm_read(struct file filp, char __user buffer,
	size_t count, loff_t *offset);
	int drm_release(struct inode inode, struct file filp);
	unsigned int drm_poll(struct file filp, struct poll_table_struct wait);
	int drm_event_reserve_init_locked(struct drm_device *dev,
	struct drm_file *file_priv,
	struct drm_pending_event *p,
	struct drm_event *e);
	int drm_event_reserve_init(struct drm_device *dev,
	struct drm_file *file_priv,
	struct drm_pending_event *p,
	struct drm_event *e);
	void drm_event_cancel_free(struct drm_device *dev,
	struct drm_pending_event *p);
	void drm_send_event_locked(struct drm_device dev, struct drm_pending_event e);
	void drm_send_event(struct drm_device dev, struct drm_pending_event e);

	#endif /* _DRM_FILE_H_ */