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 enum drm_minor_type {
  51         DRM_MINOR_PRIMARY,
  52         DRM_MINOR_CONTROL,
  53         DRM_MINOR_RENDER,
  54 };
  55
  56 /**
  57  * struct drm_minor - DRM device minor structure
  58  *
  59  * This structure represents a DRM minor number for device nodes in /dev.
  60  * Entirely opaque to drivers and should never be inspected directly by drivers.
  61  * Drivers instead should only interact with &struct drm_file and of course
  62  * &struct drm_device, which is also where driver-private data and resources can
  63  * be attached to.
  64  */
  65 struct drm_minor {
  66         /* private: */
  67         int index;                      /* Minor device number */
  68         int type;                       /* Control or render */
  69         struct device *kdev;            /* Linux device */
  70         struct drm_device *dev;
  71
  72         struct dentry *debugfs_root;
  73
  74         struct list_head debugfs_list;
  75         struct mutex debugfs_lock; /* Protects debugfs_list. */
  76 };
  77
  78 /**
  79  * struct drm_pending_event - Event queued up for userspace to read
  80  *
  81  * This represents a DRM event. Drivers can use this as a generic completion
  82  * mechanism, which supports kernel-internal &struct completion, &struct dma_fence
  83  * and also the DRM-specific &struct drm_event delivery mechanism.
  84  */
  85 struct drm_pending_event {
  86         /**
  87          * @completion:
  88          *
  89          * Optional pointer to a kernel internal completion signalled when
  90          * drm_send_event() is called, useful to internally synchronize with
  91          * nonblocking operations.
  92          */
  93         struct completion *completion;
  94
  95         /**
  96          * @completion_release:
  97          *
  98          * Optional callback currently only used by the atomic modeset helpers
  99          * to clean up the reference count for the structure @completion is
 100          * stored in.
 101          */
 102         void (*completion_release)(struct completion *completion);
 103
 104         /**
 105          * @event:
 106          *
 107          * Pointer to the actual event that should be sent to userspace to be
 108          * read using drm_read(). Can be optional, since nowadays events are
 109          * also used to signal kernel internal threads with @completion or DMA
 110          * transactions using @fence.
 111          */
 112         struct drm_event *event;
 113
 114         /**
 115          * @fence:
 116          *
 117          * Optional DMA fence to unblock other hardware transactions which
 118          * depend upon the nonblocking DRM operation this event represents.
 119          */
 120         struct dma_fence *fence;
 121
 122         /**
 123          * @file_priv:
 124          *
 125          * &struct drm_file where @event should be delivered to. Only set when
 126          * @event is set.
 127          */
 128         struct drm_file *file_priv;
 129
 130         /**
 131          * @link:
 132          *
 133          * Double-linked list to keep track of this event. Can be used by the
 134          * driver up to the point when it calls drm_send_event(), after that
 135          * this list entry is owned by the core for its own book-keeping.
 136          */
 137         struct list_head link;
 138
 139         /**
 140          * @pending_link:
 141          *
 142          * Entry on &drm_file.pending_event_list, to keep track of all pending
 143          * events for @file_priv, to allow correct unwinding of them when
 144          * userspace closes the file before the event is delivered.
 145          */
 146         struct list_head pending_link;
 147 };
 148
 149 /**
 150  * struct drm_file - DRM file private data
 151  *
 152  * This structure tracks DRM state per open file descriptor.
 153  */
 154 struct drm_file {
 155         /**
 156          * @authenticated:
 157          *
 158          * Whether the client is allowed to submit rendering, which for legacy
 159          * nodes means it must be authenticated.
 160          *
 161          * See also the :ref:`section on primary nodes and authentication
 162          * <drm_primary_node>`.
 163          */
 164         unsigned authenticated :1;
 165
 166         /**
 167          * @stereo_allowed:
 168          *
 169          * True when the client has asked us to expose stereo 3D mode flags.
 170          */
 171         unsigned stereo_allowed :1;
 172
 173         /**
 174          * @universal_planes:
 175          *
 176          * True if client understands CRTC primary planes and cursor planes
 177          * in the plane list. Automatically set when @atomic is set.
 178          */
 179         unsigned universal_planes:1;
 180
 181         /** @atomic: True if client understands atomic properties. */
 182         unsigned atomic:1;
 183
 184         /**
 185          * @is_master:
 186          *
 187          * This client is the creator of @master. Protected by struct
 188          * &drm_device.master_mutex.
 189          *
 190          * See also the :ref:`section on primary nodes and authentication
 191          * <drm_primary_node>`.
 192          */
 193         unsigned is_master:1;
 194
 195         /**
 196          * @master:
 197          *
 198          * Master this node is currently associated with. Only relevant if
 199          * drm_is_primary_client() returns true. Note that this only
 200          * matches &drm_device.master if the master is the currently active one.
 201          *
 202          * See also @authentication and @is_master and the :ref:`section on
 203          * primary nodes and authentication <drm_primary_node>`.
 204          */
 205         struct drm_master *master;
 206
 207         /** @pid: Process that opened this file. */
 208         struct pid *pid;
 209
 210         /** @magic: Authentication magic, see @authenticated. */
 211         drm_magic_t magic;
 212
 213         /**
 214          * @lhead:
 215          *
 216          * List of all open files of a DRM device, linked into
 217          * &drm_device.filelist. Protected by &drm_device.filelist_mutex.
 218          */
 219         struct list_head lhead;
 220
 221         /** @minor: &struct drm_minor for this file. */
 222         struct drm_minor *minor;
 223
 224         /**
 225          * @object_idr:
 226          *
 227          * Mapping of mm object handles to object pointers. Used by the GEM
 228          * subsystem. Protected by @table_lock.
 229          */
 230         struct idr object_idr;
 231
 232         /** @table_lock: Protects @object_idr. */
 233         spinlock_t table_lock;
 234
 235         /** @syncobj_idr: Mapping of sync object handles to object pointers. */
 236         struct idr syncobj_idr;
 237         /** @syncobj_table_lock: Protects @syncobj_idr. */
 238         spinlock_t syncobj_table_lock;
 239
 240         /** @filp: Pointer to the core file structure. */
 241         struct file *filp;
 242
 243         /**
 244          * @driver_priv:
 245          *
 246          * Optional pointer for driver private data. Can be allocated in
 247          * &drm_driver.open and should be freed in &drm_driver.postclose.
 248          */
 249         void *driver_priv;
 250
 251         /**
 252          * @fbs:
 253          *
 254          * List of &struct drm_framebuffer associated with this file, using the
 255          * &drm_framebuffer.filp_head entry.
 256          *
 257          * Protected by @fbs_lock. Note that the @fbs list holds a reference on
 258          * the framebuffer object to prevent it from untimely disappearing.
 259          */
 260         struct list_head fbs;
 261
 262         /** @fbs_lock: Protects @fbs. */
 263         struct mutex fbs_lock;
 264
 265         /**
 266          * @blobs:
 267          *
 268          * User-created blob properties; this retains a reference on the
 269          * property.
 270          *
 271          * Protected by @drm_mode_config.blob_lock;
 272          */
 273         struct list_head blobs;
 274
 275         /** @event_wait: Waitqueue for new events added to @event_list. */
 276         wait_queue_head_t event_wait;
 277
 278         /**
 279          * @pending_event_list:
 280          *
 281          * List of pending &struct drm_pending_event, used to clean up pending
 282          * events in case this file gets closed before the event is signalled.
 283          * Uses the &drm_pending_event.pending_link entry.
 284          *
 285          * Protect by &drm_device.event_lock.
 286          */
 287         struct list_head pending_event_list;
 288
 289         /**
 290          * @event_list:
 291          *
 292          * List of &struct drm_pending_event, ready for delivery to userspace
 293          * through drm_read(). Uses the &drm_pending_event.link entry.
 294          *
 295          * Protect by &drm_device.event_lock.
 296          */
 297         struct list_head event_list;
 298
 299         /**
 300          * @event_space:
 301          *
 302          * Available event space to prevent userspace from
 303          * exhausting kernel memory. Currently limited to the fairly arbitrary
 304          * value of 4KB.
 305          */
 306         int event_space;
 307
 308         /** @event_read_lock: Serializes drm_read(). */
 309         struct mutex event_read_lock;
 310
 311         /**
 312          * @prime:
 313          *
 314          * Per-file buffer caches used by the PRIME buffer sharing code.
 315          */
 316         struct drm_prime_file_private prime;
 317
 318         /* private: */
 319         unsigned long lock_count; /* DRI1 legacy lock count */
 320 };
 321
 322 /**
 323  * drm_is_primary_client - is this an open file of the primary node
 324  * @file_priv: DRM file
 325  *
 326  * Returns true if this is an open file of the primary node, i.e.
 327  * &drm_file.minor of @file_priv is a primary minor.
 328  *
 329  * See also the :ref:`section on primary nodes and authentication
 330  * <drm_primary_node>`.
 331  */
 332 static inline bool drm_is_primary_client(const struct drm_file *file_priv)
 333 {
 334         return file_priv->minor->type == DRM_MINOR_PRIMARY;
 335 }
 336
 337 /**
 338  * drm_is_render_client - is this an open file of the render node
 339  * @file_priv: DRM file
 340  *
 341  * Returns true if this is an open file of the render node, i.e.
 342  * &drm_file.minor of @file_priv is a render minor.
 343  *
 344  * See also the :ref:`section on render nodes <drm_render_node>`.
 345  */
 346 static inline bool drm_is_render_client(const struct drm_file *file_priv)
 347 {
 348         return file_priv->minor->type == DRM_MINOR_RENDER;
 349 }
 350
 351 /**
 352  * drm_is_control_client - is this an open file of the control node
 353  * @file_priv: DRM file
 354  *
 355  * Control nodes are deprecated and in the process of getting removed from the
 356  * DRM userspace API. Do not ever use!
 357  */
 358 static inline bool drm_is_control_client(const struct drm_file *file_priv)
 359 {
 360         return file_priv->minor->type == DRM_MINOR_CONTROL;
 361 }
 362
 363 int drm_open(struct inode *inode, struct file *filp);
 364 ssize_t drm_read(struct file *filp, char __user *buffer,
 365                  size_t count, loff_t *offset);
 366 int drm_release(struct inode *inode, struct file *filp);
 367 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait);
 368 int drm_event_reserve_init_locked(struct drm_device *dev,
 369                                   struct drm_file *file_priv,
 370                                   struct drm_pending_event *p,
 371                                   struct drm_event *e);
 372 int drm_event_reserve_init(struct drm_device *dev,
 373                            struct drm_file *file_priv,
 374                            struct drm_pending_event *p,
 375                            struct drm_event *e);
 376 void drm_event_cancel_free(struct drm_device *dev,
 377                            struct drm_pending_event *p);
 378 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e);
 379 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);
 380
 381 #endif /* _DRM_FILE_H_ */