include/drm/drm_device.h

   1 #ifndef _DRM_DEVICE_H_
   2 #define _DRM_DEVICE_H_
   3
   4 #include <linux/list.h>
   5 #include <linux/kref.h>
   6 #include <linux/mutex.h>
   7 #include <linux/idr.h>
   8
   9 #include <drm/drm_hashtab.h>
  10 #include <drm/drm_mode_config.h>
  11
  12 struct drm_driver;
  13 struct drm_minor;
  14 struct drm_master;
  15 struct drm_device_dma;
  16 struct drm_vblank_crtc;
  17 struct drm_sg_mem;
  18 struct drm_local_map;
  19 struct drm_vma_offset_manager;
  20 struct drm_vram_mm;
  21 struct drm_fb_helper;
  22
  23 struct inode;
  24
  25 struct pci_dev;
  26 struct pci_controller;
  27
  28
  29 /**
  30  * enum switch_power_state - power state of drm device
  31  */
  32
  33 enum switch_power_state {
  34         /** @DRM_SWITCH_POWER_ON: Power state is ON */
  35         DRM_SWITCH_POWER_ON = 0,
  36
  37         /** @DRM_SWITCH_POWER_OFF: Power state is OFF */
  38         DRM_SWITCH_POWER_OFF = 1,
  39
  40         /** @DRM_SWITCH_POWER_CHANGING: Power state is changing */
  41         DRM_SWITCH_POWER_CHANGING = 2,
  42
  43         /** @DRM_SWITCH_POWER_DYNAMIC_OFF: Suspended */
  44         DRM_SWITCH_POWER_DYNAMIC_OFF = 3,
  45 };
  46
  47 /**
  48  * struct drm_device - DRM device structure
  49  *
  50  * This structure represent a complete card that
  51  * may contain multiple heads.
  52  */
  53 struct drm_device {
  54         /**
  55          * @legacy_dev_list:
  56          *
  57          * List of devices per driver for stealth attach cleanup
  58          */
  59         struct list_head legacy_dev_list;
  60
  61         /** @if_version: Highest interface version set */
  62         int if_version;
  63
  64         /** @ref: Object ref-count */
  65         struct kref ref;
  66
  67         /** @dev: Device structure of bus-device */
  68         struct device *dev;
  69
  70         /**
  71          * @managed:
  72          *
  73          * Managed resources linked to the lifetime of this &drm_device as
  74          * tracked by @ref.
  75          */
  76         struct {
  77                 /** @managed.resources: managed resources list */
  78                 struct list_head resources;
  79                 /** @managed.final_kfree: pointer for final kfree() call */
  80                 void *final_kfree;
  81                 /** @managed.lock: protects @managed.resources */
  82                 spinlock_t lock;
  83         } managed;
  84
  85         /** @driver: DRM driver managing the device */
  86 #ifdef CONFIG_DRM_LEGACY
  87         struct drm_driver *driver;
  88 #else
  89         const struct drm_driver *driver;
  90 #endif
  91
  92         /**
  93          * @dev_private:
  94          *
  95          * DRM driver private data. This is deprecated and should be left set to
  96          * NULL.
  97          *
  98          * Instead of using this pointer it is recommended that drivers use
  99          * devm_drm_dev_alloc() and embed struct &drm_device in their larger
 100          * per-device structure.
 101          */
 102         void *dev_private;
 103
 104         /** @primary: Primary node */
 105         struct drm_minor *primary;
 106
 107         /** @render: Render node */
 108         struct drm_minor *render;
 109
 110         /**
 111          * @registered:
 112          *
 113          * Internally used by drm_dev_register() and drm_connector_register().
 114          */
 115         bool registered;
 116
 117         /**
 118          * @master:
 119          *
 120          * Currently active master for this device.
 121          * Protected by &master_mutex
 122          */
 123         struct drm_master *master;
 124
 125         /**
 126          * @driver_features: per-device driver features
 127          *
 128          * Drivers can clear specific flags here to disallow
 129          * certain features on a per-device basis while still
 130          * sharing a single &struct drm_driver instance across
 131          * all devices.
 132          */
 133         u32 driver_features;
 134
 135         /**
 136          * @unplugged:
 137          *
 138          * Flag to tell if the device has been unplugged.
 139          * See drm_dev_enter() and drm_dev_is_unplugged().
 140          */
 141         bool unplugged;
 142
 143         /** @anon_inode: inode for private address-space */
 144         struct inode *anon_inode;
 145
 146         /** @unique: Unique name of the device */
 147         char *unique;
 148
 149         /**
 150          * @struct_mutex:
 151          *
 152          * Lock for others (not &drm_minor.master and &drm_file.is_master)
 153          *
 154          * WARNING:
 155          * Only drivers annotated with DRIVER_LEGACY should be using this.
 156          */
 157         struct mutex struct_mutex;
 158
 159         /**
 160          * @master_mutex:
 161          *
 162          * Lock for &drm_minor.master and &drm_file.is_master
 163          */
 164         struct mutex master_mutex;
 165
 166         /**
 167          * @open_count:
 168          *
 169          * Usage counter for outstanding files open,
 170          * protected by drm_global_mutex
 171          */
 172         atomic_t open_count;
 173
 174         /** @filelist_mutex: Protects @filelist. */
 175         struct mutex filelist_mutex;
 176         /**
 177          * @filelist:
 178          *
 179          * List of userspace clients, linked through &drm_file.lhead.
 180          */
 181         struct list_head filelist;
 182
 183         /**
 184          * @filelist_internal:
 185          *
 186          * List of open DRM files for in-kernel clients.
 187          * Protected by &filelist_mutex.
 188          */
 189         struct list_head filelist_internal;
 190
 191         /**
 192          * @clientlist_mutex:
 193          *
 194          * Protects &clientlist access.
 195          */
 196         struct mutex clientlist_mutex;
 197
 198         /**
 199          * @clientlist:
 200          *
 201          * List of in-kernel clients. Protected by &clientlist_mutex.
 202          */
 203         struct list_head clientlist;
 204
 205         /**
 206          * @irq_enabled:
 207          *
 208          * Indicates that interrupt handling is enabled, specifically vblank
 209          * handling. Drivers which don't use drm_irq_install() need to set this
 210          * to true manually.
 211          */
 212         bool irq_enabled;
 213
 214         /**
 215          * @irq: Used by the drm_irq_install() and drm_irq_unistall() helpers.
 216          */
 217         int irq;
 218
 219         /**
 220          * @vblank_disable_immediate:
 221          *
 222          * If true, vblank interrupt will be disabled immediately when the
 223          * refcount drops to zero, as opposed to via the vblank disable
 224          * timer.
 225          *
 226          * This can be set to true it the hardware has a working vblank counter
 227          * with high-precision timestamping (otherwise there are races) and the
 228          * driver uses drm_crtc_vblank_on() and drm_crtc_vblank_off()
 229          * appropriately. See also @max_vblank_count and
 230          * &drm_crtc_funcs.get_vblank_counter.
 231          */
 232         bool vblank_disable_immediate;
 233
 234         /**
 235          * @vblank:
 236          *
 237          * Array of vblank tracking structures, one per &struct drm_crtc. For
 238          * historical reasons (vblank support predates kernel modesetting) this
 239          * is free-standing and not part of &struct drm_crtc itself. It must be
 240          * initialized explicitly by calling drm_vblank_init().
 241          */
 242         struct drm_vblank_crtc *vblank;
 243
 244         /**
 245          * @vblank_time_lock:
 246          *
 247          *  Protects vblank count and time updates during vblank enable/disable
 248          */
 249         spinlock_t vblank_time_lock;
 250         /**
 251          * @vbl_lock: Top-level vblank references lock, wraps the low-level
 252          * @vblank_time_lock.
 253          */
 254         spinlock_t vbl_lock;
 255
 256         /**
 257          * @max_vblank_count:
 258          *
 259          * Maximum value of the vblank registers. This value +1 will result in a
 260          * wrap-around of the vblank register. It is used by the vblank core to
 261          * handle wrap-arounds.
 262          *
 263          * If set to zero the vblank core will try to guess the elapsed vblanks
 264          * between times when the vblank interrupt is disabled through
 265          * high-precision timestamps. That approach is suffering from small
 266          * races and imprecision over longer time periods, hence exposing a
 267          * hardware vblank counter is always recommended.
 268          *
 269          * This is the statically configured device wide maximum. The driver
 270          * can instead choose to use a runtime configurable per-crtc value
 271          * &drm_vblank_crtc.max_vblank_count, in which case @max_vblank_count
 272          * must be left at zero. See drm_crtc_set_max_vblank_count() on how
 273          * to use the per-crtc value.
 274          *
 275          * If non-zero, &drm_crtc_funcs.get_vblank_counter must be set.
 276          */
 277         u32 max_vblank_count;
 278
 279         /** @vblank_event_list: List of vblank events */
 280         struct list_head vblank_event_list;
 281
 282         /**
 283          * @event_lock:
 284          *
 285          * Protects @vblank_event_list and event delivery in
 286          * general. See drm_send_event() and drm_send_event_locked().
 287          */
 288         spinlock_t event_lock;
 289
 290         /** @agp: AGP data */
 291         struct drm_agp_head *agp;
 292
 293         /** @pdev: PCI device structure */
 294         struct pci_dev *pdev;
 295
 296 #ifdef __alpha__
 297         /** @hose: PCI hose, only used on ALPHA platforms. */
 298         struct pci_controller *hose;
 299 #endif
 300         /** @num_crtcs: Number of CRTCs on this device */
 301         unsigned int num_crtcs;
 302
 303         /** @mode_config: Current mode config */
 304         struct drm_mode_config mode_config;
 305
 306         /** @object_name_lock: GEM information */
 307         struct mutex object_name_lock;
 308
 309         /** @object_name_idr: GEM information */
 310         struct idr object_name_idr;
 311
 312         /** @vma_offset_manager: GEM information */
 313         struct drm_vma_offset_manager *vma_offset_manager;
 314
 315         /** @vram_mm: VRAM MM memory manager */
 316         struct drm_vram_mm *vram_mm;
 317
 318         /**
 319          * @switch_power_state:
 320          *
 321          * Power state of the client.
 322          * Used by drivers supporting the switcheroo driver.
 323          * The state is maintained in the
 324          * &vga_switcheroo_client_ops.set_gpu_state callback
 325          */
 326         enum switch_power_state switch_power_state;
 327
 328         /**
 329          * @fb_helper:
 330          *
 331          * Pointer to the fbdev emulation structure.
 332          * Set by drm_fb_helper_init() and cleared by drm_fb_helper_fini().
 333          */
 334         struct drm_fb_helper *fb_helper;
 335
 336         /* Everything below here is for legacy driver, never use! */
 337         /* private: */
 338 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 339         /* Context handle management - linked list of context handles */
 340         struct list_head ctxlist;
 341
 342         /* Context handle management - mutex for &ctxlist */
 343         struct mutex ctxlist_mutex;
 344
 345         /* Context handle management */
 346         struct idr ctx_idr;
 347
 348         /* Memory management - linked list of regions */
 349         struct list_head maplist;
 350
 351         /* Memory management - user token hash table for maps */
 352         struct drm_open_hash map_hash;
 353
 354         /* Context handle management - list of vmas (for debugging) */
 355         struct list_head vmalist;
 356
 357         /* Optional pointer for DMA support */
 358         struct drm_device_dma *dma;
 359
 360         /* Context swapping flag */
 361         __volatile__ long context_flag;
 362
 363         /* Last current context */
 364         int last_context;
 365
 366         /* Lock for &buf_use and a few other things. */
 367         spinlock_t buf_lock;
 368
 369         /* Usage counter for buffers in use -- cannot alloc */
 370         int buf_use;
 371
 372         /* Buffer allocation in progress */
 373         atomic_t buf_alloc;
 374
 375         struct {
 376                 int context;
 377                 struct drm_hw_lock *lock;
 378         } sigdata;
 379
 380         struct drm_local_map *agp_buffer_map;
 381         unsigned int agp_buffer_token;
 382
 383         /* Scatter gather memory */
 384         struct drm_sg_mem *sg;
 385 #endif
 386 };
 387
 388 #endif