Quelle drm_file.h
Sprache: C
/*
* 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 <linux/idr.h>
#include <uapi/drm/drm.h>
#include <drm/drm_prime.h>
struct dma_fence;
struct drm_file;
struct drm_device;
struct drm_printer;
struct device;
struct file;
extern struct xarray drm_minors_xa;
/*
* 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 .
*/
/* Note that the values of this enum are ABI (it determines
* / dev / dri / renderD * numbers ) .
*
* Setting DRM_MINOR_ACCEL to 32 gives enough space for more drm minors to
* be implemented before we hit any future
*/
enum drm_minor_type {
DRM_MINOR_PRIMARY = 0 ,
DRM_MINOR_CONTROL = 1 ,
DRM_MINOR_RENDER = 2 ,
DRM_MINOR_ACCEL = 32 ,
};
/**
* 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 or accel */
struct device *kdev; /* Linux device */
struct drm_device *dev;
struct dentry *debugfs_symlink;
struct dentry *debugfs_root;
};
/**
* 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 > ` .
*/
bool authenticated;
/**
* @ stereo_allowed :
*
* True when the client has asked us to expose stereo 3 D mode flags .
*/
bool stereo_allowed;
/**
* @ universal_planes :
*
* True if client understands CRTC primary planes and cursor planes
* in the plane list . Automatically set when @ atomic is set .
*/
bool universal_planes;
/** @atomic: True if client understands atomic properties. */
bool atomic;
/**
* @ aspect_ratio_allowed :
*
* True , if client can handle picture aspect ratios , and has requested
* to pass this information along with the mode .
*/
bool aspect_ratio_allowed;
/**
* @ writeback_connectors :
*
* True if client understands writeback connectors
*/
bool writeback_connectors;
/**
* @ was_master :
*
* This client has or had , master capability . Protected by struct
* & drm_device . master_mutex .
*
* This is used to ensure that CAP_SYS_ADMIN is not enforced , if the
* client is or was master in the past .
*/
bool was_master;
/**
* @ 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 > ` .
*/
bool is_master;
/**
* @ supports_virtualized_cursor_plane :
*
* This client is capable of handling the cursor plane with the
* restrictions imposed on it by the virtualized drivers .
*
* This implies that the cursor plane has to behave like a cursor
* i . e . track cursor movement . It also requires setting of the
* hotspot properties by the client on the cursor plane .
*/
bool supports_virtualized_cursor_plane;
/**
* @ master :
*
* Master this node is currently associated with . Protected by struct
* & drm_device . master_mutex , and serialized by @ master_lookup_lock .
*
* 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 .
*
* To update @ master , both & drm_device . master_mutex and
* @ master_lookup_lock need to be held , therefore holding either of
* them is safe and enough for the read side .
*
* When dereferencing this pointer , either hold struct
* & drm_device . master_mutex for the duration of the pointer ' s use , or
* use drm_file_get_master ( ) if struct & drm_device . master_mutex is not
* currently held and there is no other need to hold it . This prevents
* @ master from being freed during use .
*
* See also @ authentication and @ is_master and the : ref : ` section on
* primary nodes and authentication < drm_primary_node > ` .
*/
struct drm_master *master;
/** @master_lookup_lock: Serializes @master. */
spinlock_t master_lookup_lock;
/**
* @ pid : Process that is using this file .
*
* Must only be dereferenced under a rcu_read_lock or equivalent .
*
* Updates are guarded with dev - > filelist_mutex and reference must be
* dropped after a RCU grace period to accommodate lockless readers .
*/
struct pid __rcu *pid;
/** @client_id: A unique id for fdinfo */
u64 client_id;
/** @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 .
*
* Note that allocated entries might be NULL as a transient state when
* creating or deleting a handle .
*/
struct idr object_idr;
/** @table_lock: Protects @object_idr. */
spinlock_t table_lock;
/** @syncobj_idr: Mapping of sync object handles to object pointers. */
struct idr syncobj_idr;
/** @syncobj_table_lock: Protects @syncobj_idr. */
spinlock_t syncobj_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 4 KB .
*/
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;
/**
* @ client_name :
*
* Userspace - provided name ; useful for accounting and debugging .
*/
const char *client_name;
/**
* @ client_name_lock : Protects @ client_name .
*/
struct mutex client_name_lock;
/**
* @ debugfs_client :
*
* debugfs directory for each client under a drm node .
*/
struct dentry *debugfs_client;
};
/**
* 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_accel_client - is this an open file of the compute acceleration node
* @ file_priv : DRM file
*
* Returns true if this is an open file of the compute acceleration node , i . e .
* & drm_file . minor of @ file_priv is a accel minor .
*
* See also : doc : ` Introduction to compute accelerators subsystem
* < / accel / introduction > ` .
*/
static inline bool drm_is_accel_client(const struct drm_file *file_priv)
{
return file_priv->minor->type == DRM_MINOR_ACCEL;
}
__printf(2 , 3 )
void drm_file_err(struct drm_file *file_priv, const char *fmt, ...);
void drm_file_update_pid(struct drm_file *);
struct drm_minor *drm_minor_acquire(struct xarray *minors_xa, unsigned int minor_id);
void drm_minor_release(struct drm_minor *minor);
int drm_open(struct inode *inode, struct file *filp);
int drm_open_helper(struct file *filp, struct drm_minor *minor);
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);
int drm_release_noglobal(struct inode *inode, struct file *filp);
__poll_t 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);
void drm_send_event_timestamp_locked(struct drm_device *dev,
struct drm_pending_event *e,
ktime_t timestamp);
/**
* struct drm_memory_stats - GEM object stats associated
* @ shared : Total size of GEM objects shared between processes
* @ private : Total size of GEM objects
* @ resident : Total size of GEM objects backing pages
* @ purgeable : Total size of GEM objects that can be purged ( resident and not active )
* @ active : Total size of GEM objects active on one or more engines
*
* Used by drm_print_memory_stats ( )
*/
struct drm_memory_stats {
u64 shared;
u64 private ;
u64 resident;
u64 purgeable;
u64 active;
};
enum drm_gem_object_status;
int drm_memory_stats_is_zero(const struct drm_memory_stats *stats);
void drm_fdinfo_print_size(struct drm_printer *p,
const char *prefix,
const char *stat,
const char *region,
u64 sz);
void drm_print_memory_stats(struct drm_printer *p,
const struct drm_memory_stats *stats,
enum drm_gem_object_status supported_status,
const char *region);
void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file);
void drm_show_fdinfo(struct seq_file *m, struct file *f);
struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags);
#endif /* _DRM_FILE_H_ */
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(vorverarbeitet am 2026-09-29)
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*© Formatika GbR, Deutschland
2026-10-10
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