include/drm/drm_file.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  * All rights reserved.
   6  *
   7  * Author: Rickard E. (Rik) Faith <faith@valinux.com>
   8  * Author: Gareth Hughes <gareth@valinux.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a
  11  * copy of this software and associated documentation files (the "Software"),
  12  * to deal in the Software without restriction, including without limitation
  13  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  14  * and/or sell copies of the Software, and to permit persons to whom the
  15  * Software is furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice (including the next
  18  * paragraph) shall be included in all copies or substantial portions of the
  19  * Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  24  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  25  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  26  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  27  * OTHER DEALINGS IN THE SOFTWARE.
  28  */
  29
  30 #ifndef _DRM_FILE_H_
  31 #define _DRM_FILE_H_
  32
  33 #include <linux/types.h>
  34 #include <linux/completion.h>
  35
  36 #include <uapi/drm/drm.h>
  37
  38 #include <drm/drm_prime.h>
  39
  40 struct dma_fence;
  41 struct drm_file;
  42 struct drm_device;
  43 struct device;
  44
  45 /*
  46  * FIXME: Not sure we want to have drm_minor here in the end, but to avoid
  47  * header include loops we need it here for now.
  48  */
  49
  50 /* Note that the order of this enum is ABI (it determines
  51  * /dev/dri/renderD* numbers).
  52  */
  53 enum drm_minor_type {
  54         DRM_MINOR_PRIMARY,
  55         DRM_MINOR_CONTROL,
  56         DRM_MINOR_RENDER,
  57 };
  58
  59 /**
  60  * struct drm_minor - DRM device minor structure
  61  *
  62  * This structure represents a DRM minor number for device nodes in /dev.
  63  * Entirely opaque to drivers and should never be inspected directly by drivers.
  64  * Drivers instead should only interact with &struct drm_file and of course
  65  * &struct drm_device, which is also where driver-private data and resources can
  66  * be attached to.
  67  */
  68 struct drm_minor {
  69         /* private: */
  70         int index;                      /* Minor device number */
  71         int type;                       /* Control or render */
  72         struct device *kdev;            /* Linux device */
  73         struct drm_device *dev;
  74
  75         struct dentry *debugfs_root;
  76
  77         struct list_head debugfs_list;
  78         struct mutex debugfs_lock; /* Protects debugfs_list. */
  79 };
  80
  81 /**
  82  * struct drm_pending_event - Event queued up for userspace to read
  83  *
  84  * This represents a DRM event. Drivers can use this as a generic completion
  85  * mechanism, which supports kernel-internal &struct completion, &struct dma_fence
  86  * and also the DRM-specific &struct drm_event delivery mechanism.
  87  */
  88 struct drm_pending_event {
  89         /**
  90          * @completion:
  91          *
  92          * Optional pointer to a kernel internal completion signalled when
  93          * drm_send_event() is called, useful to internally synchronize with
  94          * nonblocking operations.
  95          */
  96         struct completion *completion;
  97
  98         /**
  99          * @completion_release:
 100          *
 101          * Optional callback currently only used by the atomic modeset helpers
 102          * to clean up the reference count for the structure @completion is
 103          * stored in.
 104          */
 105         void (*completion_release)(struct completion *completion);
 106
 107         /**
 108          * @event:
 109          *
 110          * Pointer to the actual event that should be sent to userspace to be
 111          * read using drm_read(). Can be optional, since nowadays events are
 112          * also used to signal kernel internal threads with @completion or DMA
 113          * transactions using @fence.
 114          */
 115         struct drm_event *event;
 116
 117         /**
 118          * @fence:
 119          *
 120          * Optional DMA fence to unblock other hardware transactions which
 121          * depend upon the nonblocking DRM operation this event represents.
 122          */
 123         struct dma_fence *fence;
 124
 125         /**
 126          * @file_priv:
 127          *
 128          * &struct drm_file where @event should be delivered to. Only set when
 129          * @event is set.
 130          */
 131         struct drm_file *file_priv;
 132
 133         /**
 134          * @link:
 135          *
 136          * Double-linked list to keep track of this event. Can be used by the
 137          * driver up to the point when it calls drm_send_event(), after that
 138          * this list entry is owned by the core for its own book-keeping.
 139          */
 140         struct list_head link;
 141
 142         /**
 143          * @pending_link:
 144          *
 145          * Entry on &drm_file.pending_event_list, to keep track of all pending
 146          * events for @file_priv, to allow correct unwinding of them when
 147          * userspace closes the file before the event is delivered.
 148          */
 149         struct list_head pending_link;
 150 };
 151
 152 /**
 153  * struct drm_file - DRM file private data
 154  *
 155  * This structure tracks DRM state per open file descriptor.
 156  */
 157 struct drm_file {
 158         /**
 159          * @authenticated:
 160          *
 161          * Whether the client is allowed to submit rendering, which for legacy
 162          * nodes means it must be authenticated.
 163          *
 164          * See also the :ref:`section on primary nodes and authentication
 165          * <drm_primary_node>`.
 166          */
 167         bool authenticated;
 168
 169         /**
 170          * @stereo_allowed:
 171          *
 172          * True when the client has asked us to expose stereo 3D mode flags.
 173          */
 174         bool stereo_allowed;
 175
 176         /**
 177          * @universal_planes:
 178          *
 179          * True if client understands CRTC primary planes and cursor planes
 180          * in the plane list. Automatically set when @atomic is set.
 181          */
 182         bool universal_planes;
 183
 184         /** @atomic: True if client understands atomic properties. */
 185         bool atomic;
 186
 187         /**
 188          * @aspect_ratio_allowed:
 189          *
 190          * True, if client can handle picture aspect ratios, and has requested
 191          * to pass this information along with the mode.
 192          */
 193         bool aspect_ratio_allowed;
 194
 195         /**
 196          * @writeback_connectors:
 197          *
 198          * True if client understands writeback connectors
 199          */
 200         bool writeback_connectors;
 201
 202         /**
 203          * @is_master:
 204          *
 205          * This client is the creator of @master. Protected by struct
 206          * &drm_device.master_mutex.
 207          *
 208          * See also the :ref:`section on primary nodes and authentication
 209          * <drm_primary_node>`.
 210          */
 211         bool is_master;
 212
 213         /**
 214          * @master:
 215          *
 216          * Master this node is currently associated with. Only relevant if
 217          * drm_is_primary_client() returns true. Note that this only
 218          * matches &drm_device.master if the master is the currently active one.
 219          *
 220          * See also @authentication and @is_master and the :ref:`section on
 221          * primary nodes and authentication <drm_primary_node>`.
 222          */
 223         struct drm_master *master;
 224
 225         /** @pid: Process that opened this file. */
 226         struct pid *pid;
 227
 228         /** @magic: Authentication magic, see @authenticated. */
 229         drm_magic_t magic;
 230
 231         /**
 232          * @lhead:
 233          *
 234          * List of all open files of a DRM device, linked into
 235          * &drm_device.filelist. Protected by &drm_device.filelist_mutex.
 236          */
 237         struct list_head lhead;
 238
 239         /** @minor: &struct drm_minor for this file. */
 240         struct drm_minor *minor;
 241
 242         /**
 243          * @object_idr:
 244          *
 245          * Mapping of mm object handles to object pointers. Used by the GEM
 246          * subsystem. Protected by @table_lock.
 247          */
 248         struct idr object_idr;
 249
 250         /** @table_lock: Protects @object_idr. */
 251         spinlock_t table_lock;
 252
 253         /** @syncobj_idr: Mapping of sync object handles to object pointers. */
 254         struct idr syncobj_idr;
 255         /** @syncobj_table_lock: Protects @syncobj_idr. */
 256         spinlock_t syncobj_table_lock;
 257
 258         /** @filp: Pointer to the core file structure. */
 259         struct file *filp;
 260
 261         /**
 262          * @driver_priv:
 263          *
 264          * Optional pointer for driver private data. Can be allocated in
 265          * &drm_driver.open and should be freed in &drm_driver.postclose.
 266          */
 267         void *driver_priv;
 268
 269         /**
 270          * @fbs:
 271          *
 272          * List of &struct drm_framebuffer associated with this file, using the
 273          * &drm_framebuffer.filp_head entry.
 274          *
 275          * Protected by @fbs_lock. Note that the @fbs list holds a reference on
 276          * the framebuffer object to prevent it from untimely disappearing.
 277          */
 278         struct list_head fbs;
 279
 280         /** @fbs_lock: Protects @fbs. */
 281         struct mutex fbs_lock;
 282
 283         /**
 284          * @blobs:
 285          *
 286          * User-created blob properties; this retains a reference on the
 287          * property.
 288          *
 289          * Protected by @drm_mode_config.blob_lock;
 290          */
 291         struct list_head blobs;
 292
 293         /** @event_wait: Waitqueue for new events added to @event_list. */
 294         wait_queue_head_t event_wait;
 295
 296         /**
 297          * @pending_event_list:
 298          *
 299          * List of pending &struct drm_pending_event, used to clean up pending
 300          * events in case this file gets closed before the event is signalled.
 301          * Uses the &drm_pending_event.pending_link entry.
 302          *
 303          * Protect by &drm_device.event_lock.
 304          */
 305         struct list_head pending_event_list;
 306
 307         /**
 308          * @event_list:
 309          *
 310          * List of &struct drm_pending_event, ready for delivery to userspace
 311          * through drm_read(). Uses the &drm_pending_event.link entry.
 312          *
 313          * Protect by &drm_device.event_lock.
 314          */
 315         struct list_head event_list;
 316
 317         /**
 318          * @event_space:
 319          *
 320          * Available event space to prevent userspace from
 321          * exhausting kernel memory. Currently limited to the fairly arbitrary
 322          * value of 4KB.
 323          */
 324         int event_space;
 325
 326         /** @event_read_lock: Serializes drm_read(). */
 327         struct mutex event_read_lock;
 328
 329         /**
 330          * @prime:
 331          *
 332          * Per-file buffer caches used by the PRIME buffer sharing code.
 333          */
 334         struct drm_prime_file_private prime;
 335
 336         /* private: */
 337         unsigned long lock_count; /* DRI1 legacy lock count */
 338 };
 339
 340 /**
 341  * drm_is_primary_client - is this an open file of the primary node
 342  * @file_priv: DRM file
 343  *
 344  * Returns true if this is an open file of the primary node, i.e.
 345  * &drm_file.minor of @file_priv is a primary minor.
 346  *
 347  * See also the :ref:`section on primary nodes and authentication
 348  * <drm_primary_node>`.
 349  */
 350 static inline bool drm_is_primary_client(const struct drm_file *file_priv)
 351 {
 352         return file_priv->minor->type == DRM_MINOR_PRIMARY;
 353 }
 354
 355 /**
 356  * drm_is_render_client - is this an open file of the render node
 357  * @file_priv: DRM file
 358  *
 359  * Returns true if this is an open file of the render node, i.e.
 360  * &drm_file.minor of @file_priv is a render minor.
 361  *
 362  * See also the :ref:`section on render nodes <drm_render_node>`.
 363  */
 364 static inline bool drm_is_render_client(const struct drm_file *file_priv)
 365 {
 366         return file_priv->minor->type == DRM_MINOR_RENDER;
 367 }
 368
 369 int drm_open(struct inode *inode, struct file *filp);
 370 ssize_t drm_read(struct file *filp, char __user *buffer,
 371                  size_t count, loff_t *offset);
 372 int drm_release(struct inode *inode, struct file *filp);
 373 __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait);
 374 int drm_event_reserve_init_locked(struct drm_device *dev,
 375                                   struct drm_file *file_priv,
 376                                   struct drm_pending_event *p,
 377                                   struct drm_event *e);
 378 int drm_event_reserve_init(struct drm_device *dev,
 379                            struct drm_file *file_priv,
 380                            struct drm_pending_event *p,
 381                            struct drm_event *e);
 382 void drm_event_cancel_free(struct drm_device *dev,
 383                            struct drm_pending_event *p);
 384 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e);
 385 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);
 386
 387 #endif /* _DRM_FILE_H_ */