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+/*
+ * 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 "drm.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_ */