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 #include <linux/idr.h>
  36
  37 #include <uapi/drm/drm.h>
  38
  39 #include <drm/drm_prime.h>
  40
  41 struct dma_fence;
  42 struct drm_file;
  43 struct drm_device;
  44 struct device;
  45 struct file;
  46
  47 /*
  48  * FIXME: Not sure we want to have drm_minor here in the end, but to avoid
  49  * header include loops we need it here for now.
  50  */
  51
  52 /* Note that the order of this enum is ABI (it determines
  53  * /dev/dri/renderD* numbers).
  54  */
  55 enum drm_minor_type {
  56         DRM_MINOR_PRIMARY,
  57         DRM_MINOR_CONTROL,
  58         DRM_MINOR_RENDER,
  59 };
  60
  61 /**
  62  * struct drm_minor - DRM device minor structure
  63  *
  64  * This structure represents a DRM minor number for device nodes in /dev.
  65  * Entirely opaque to drivers and should never be inspected directly by drivers.
  66  * Drivers instead should only interact with &struct drm_file and of course
  67  * &struct drm_device, which is also where driver-private data and resources can
  68  * be attached to.
  69  */
  70 struct drm_minor {
  71         /* private: */
  72         int index;                      /* Minor device number */
  73         int type;                       /* Control or render */
  74         struct device *kdev;            /* Linux device */
  75         struct drm_device *dev;
  76
  77         struct dentry *debugfs_root;
  78
  79         struct list_head debugfs_list;
  80         struct mutex debugfs_lock; /* Protects debugfs_list. */
  81 };
  82
  83 /**
  84  * struct drm_pending_event - Event queued up for userspace to read
  85  *
  86  * This represents a DRM event. Drivers can use this as a generic completion
  87  * mechanism, which supports kernel-internal &struct completion, &struct dma_fence
  88  * and also the DRM-specific &struct drm_event delivery mechanism.
  89  */
  90 struct drm_pending_event {
  91         /**
  92          * @completion:
  93          *
  94          * Optional pointer to a kernel internal completion signalled when
  95          * drm_send_event() is called, useful to internally synchronize with
  96          * nonblocking operations.
  97          */
  98         struct completion *completion;
  99
 100         /**
 101          * @completion_release:
 102          *
 103          * Optional callback currently only used by the atomic modeset helpers
 104          * to clean up the reference count for the structure @completion is
 105          * stored in.
 106          */
 107         void (*completion_release)(struct completion *completion);
 108
 109         /**
 110          * @event:
 111          *
 112          * Pointer to the actual event that should be sent to userspace to be
 113          * read using drm_read(). Can be optional, since nowadays events are
 114          * also used to signal kernel internal threads with @completion or DMA
 115          * transactions using @fence.
 116          */
 117         struct drm_event *event;
 118
 119         /**
 120          * @fence:
 121          *
 122          * Optional DMA fence to unblock other hardware transactions which
 123          * depend upon the nonblocking DRM operation this event represents.
 124          */
 125         struct dma_fence *fence;
 126
 127         /**
 128          * @file_priv:
 129          *
 130          * &struct drm_file where @event should be delivered to. Only set when
 131          * @event is set.
 132          */
 133         struct drm_file *file_priv;
 134
 135         /**
 136          * @link:
 137          *
 138          * Double-linked list to keep track of this event. Can be used by the
 139          * driver up to the point when it calls drm_send_event(), after that
 140          * this list entry is owned by the core for its own book-keeping.
 141          */
 142         struct list_head link;
 143
 144         /**
 145          * @pending_link:
 146          *
 147          * Entry on &drm_file.pending_event_list, to keep track of all pending
 148          * events for @file_priv, to allow correct unwinding of them when
 149          * userspace closes the file before the event is delivered.
 150          */
 151         struct list_head pending_link;
 152 };
 153
 154 /**
 155  * struct drm_file - DRM file private data
 156  *
 157  * This structure tracks DRM state per open file descriptor.
 158  */
 159 struct drm_file {
 160         /**
 161          * @authenticated:
 162          *
 163          * Whether the client is allowed to submit rendering, which for legacy
 164          * nodes means it must be authenticated.
 165          *
 166          * See also the :ref:`section on primary nodes and authentication
 167          * <drm_primary_node>`.
 168          */
 169         bool authenticated;
 170
 171         /**
 172          * @stereo_allowed:
 173          *
 174          * True when the client has asked us to expose stereo 3D mode flags.
 175          */
 176         bool stereo_allowed;
 177
 178         /**
 179          * @universal_planes:
 180          *
 181          * True if client understands CRTC primary planes and cursor planes
 182          * in the plane list. Automatically set when @atomic is set.
 183          */
 184         bool universal_planes;
 185
 186         /** @atomic: True if client understands atomic properties. */
 187         bool atomic;
 188
 189         /**
 190          * @aspect_ratio_allowed:
 191          *
 192          * True, if client can handle picture aspect ratios, and has requested
 193          * to pass this information along with the mode.
 194          */
 195         bool aspect_ratio_allowed;
 196
 197         /**
 198          * @writeback_connectors:
 199          *
 200          * True if client understands writeback connectors
 201          */
 202         bool writeback_connectors;
 203
 204         /**
 205          * @was_master:
 206          *
 207          * This client has or had, master capability. Protected by struct
 208          * &drm_device.master_mutex.
 209          *
 210          * This is used to ensure that CAP_SYS_ADMIN is not enforced, if the
 211          * client is or was master in the past.
 212          */
 213         bool was_master;
 214
 215         /**
 216          * @is_master:
 217          *
 218          * This client is the creator of @master. Protected by struct
 219          * &drm_device.master_mutex.
 220          *
 221          * See also the :ref:`section on primary nodes and authentication
 222          * <drm_primary_node>`.
 223          */
 224         bool is_master;
 225
 226         /**
 227          * @master:
 228          *
 229          * Master this node is currently associated with. Only relevant if
 230          * drm_is_primary_client() returns true. Note that this only
 231          * matches &drm_device.master if the master is the currently active one.
 232          *
 233          * See also @authentication and @is_master and the :ref:`section on
 234          * primary nodes and authentication <drm_primary_node>`.
 235          */
 236         struct drm_master *master;
 237
 238         /** @pid: Process that opened this file. */
 239         struct pid *pid;
 240
 241         /** @magic: Authentication magic, see @authenticated. */
 242         drm_magic_t magic;
 243
 244         /**
 245          * @lhead:
 246          *
 247          * List of all open files of a DRM device, linked into
 248          * &drm_device.filelist. Protected by &drm_device.filelist_mutex.
 249          */
 250         struct list_head lhead;
 251
 252         /** @minor: &struct drm_minor for this file. */
 253         struct drm_minor *minor;
 254
 255         /**
 256          * @object_idr:
 257          *
 258          * Mapping of mm object handles to object pointers. Used by the GEM
 259          * subsystem. Protected by @table_lock.
 260          */
 261         struct idr object_idr;
 262
 263         /** @table_lock: Protects @object_idr. */
 264         spinlock_t table_lock;
 265
 266         /** @syncobj_idr: Mapping of sync object handles to object pointers. */
 267         struct idr syncobj_idr;
 268         /** @syncobj_table_lock: Protects @syncobj_idr. */
 269         spinlock_t syncobj_table_lock;
 270
 271         /** @filp: Pointer to the core file structure. */
 272         struct file *filp;
 273
 274         /**
 275          * @driver_priv:
 276          *
 277          * Optional pointer for driver private data. Can be allocated in
 278          * &drm_driver.open and should be freed in &drm_driver.postclose.
 279          */
 280         void *driver_priv;
 281
 282         /**
 283          * @fbs:
 284          *
 285          * List of &struct drm_framebuffer associated with this file, using the
 286          * &drm_framebuffer.filp_head entry.
 287          *
 288          * Protected by @fbs_lock. Note that the @fbs list holds a reference on
 289          * the framebuffer object to prevent it from untimely disappearing.
 290          */
 291         struct list_head fbs;
 292
 293         /** @fbs_lock: Protects @fbs. */
 294         struct mutex fbs_lock;
 295
 296         /**
 297          * @blobs:
 298          *
 299          * User-created blob properties; this retains a reference on the
 300          * property.
 301          *
 302          * Protected by @drm_mode_config.blob_lock;
 303          */
 304         struct list_head blobs;
 305
 306         /** @event_wait: Waitqueue for new events added to @event_list. */
 307         wait_queue_head_t event_wait;
 308
 309         /**
 310          * @pending_event_list:
 311          *
 312          * List of pending &struct drm_pending_event, used to clean up pending
 313          * events in case this file gets closed before the event is signalled.
 314          * Uses the &drm_pending_event.pending_link entry.
 315          *
 316          * Protect by &drm_device.event_lock.
 317          */
 318         struct list_head pending_event_list;
 319
 320         /**
 321          * @event_list:
 322          *
 323          * List of &struct drm_pending_event, ready for delivery to userspace
 324          * through drm_read(). Uses the &drm_pending_event.link entry.
 325          *
 326          * Protect by &drm_device.event_lock.
 327          */
 328         struct list_head event_list;
 329
 330         /**
 331          * @event_space:
 332          *
 333          * Available event space to prevent userspace from
 334          * exhausting kernel memory. Currently limited to the fairly arbitrary
 335          * value of 4KB.
 336          */
 337         int event_space;
 338
 339         /** @event_read_lock: Serializes drm_read(). */
 340         struct mutex event_read_lock;
 341
 342         /**
 343          * @prime:
 344          *
 345          * Per-file buffer caches used by the PRIME buffer sharing code.
 346          */
 347         struct drm_prime_file_private prime;
 348
 349         /* private: */
 350 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 351         unsigned long lock_count; /* DRI1 legacy lock count */
 352 #endif
 353 };
 354
 355 /**
 356  * drm_is_primary_client - is this an open file of the primary node
 357  * @file_priv: DRM file
 358  *
 359  * Returns true if this is an open file of the primary node, i.e.
 360  * &drm_file.minor of @file_priv is a primary minor.
 361  *
 362  * See also the :ref:`section on primary nodes and authentication
 363  * <drm_primary_node>`.
 364  */
 365 static inline bool drm_is_primary_client(const struct drm_file *file_priv)
 366 {
 367         return file_priv->minor->type == DRM_MINOR_PRIMARY;
 368 }
 369
 370 /**
 371  * drm_is_render_client - is this an open file of the render node
 372  * @file_priv: DRM file
 373  *
 374  * Returns true if this is an open file of the render node, i.e.
 375  * &drm_file.minor of @file_priv is a render minor.
 376  *
 377  * See also the :ref:`section on render nodes <drm_render_node>`.
 378  */
 379 static inline bool drm_is_render_client(const struct drm_file *file_priv)
 380 {
 381         return file_priv->minor->type == DRM_MINOR_RENDER;
 382 }
 383
 384 int drm_open(struct inode *inode, struct file *filp);
 385 ssize_t drm_read(struct file *filp, char __user *buffer,
 386                  size_t count, loff_t *offset);
 387 int drm_release(struct inode *inode, struct file *filp);
 388 int drm_release_noglobal(struct inode *inode, struct file *filp);
 389 __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait);
 390 int drm_event_reserve_init_locked(struct drm_device *dev,
 391                                   struct drm_file *file_priv,
 392                                   struct drm_pending_event *p,
 393                                   struct drm_event *e);
 394 int drm_event_reserve_init(struct drm_device *dev,
 395                            struct drm_file *file_priv,
 396                            struct drm_pending_event *p,
 397                            struct drm_event *e);
 398 void drm_event_cancel_free(struct drm_device *dev,
 399                            struct drm_pending_event *p);
 400 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e);
 401 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);
 402
 403 struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags);
 404
 405 #ifdef CONFIG_MMU
 406 struct drm_vma_offset_manager;
 407 unsigned long drm_get_unmapped_area(struct file *file,
 408                                     unsigned long uaddr, unsigned long len,
 409                                     unsigned long pgoff, unsigned long flags,
 410                                     struct drm_vma_offset_manager *mgr);
 411 #endif /* CONFIG_MMU */
 412
 413
 414 #endif /* _DRM_FILE_H_ */