#ifndef _DRM_DEVICE_H_ #define _DRM_DEVICE_H_ #include <linux/list.h> #include <linux/kref.h> #ifdef CONFIG_TRANSPARENT_HUGEPAGE #include <linux/mount.h> #endif #include <linux/mutex.h> #include <linux/idr.h> #include <linux/sched.h> #include <drm/drm_mode_config.h> struct drm_driver; struct drm_minor; struct drm_master; struct drm_vblank_crtc; struct drm_vma_offset_manager; struct drm_vram_mm; struct drm_fb_helper; struct inode; struct pci_dev; struct pci_controller; /* * Recovery methods for wedged device in order of less to more side-effects. * To be used with drm_dev_wedged_event() as recovery @method. Callers can * use any one, multiple (or'd) or none depending on their needs. * * Refer to "Device Wedging" chapter in Documentation/gpu/drm-uapi.rst for more * details. */ #define DRM_WEDGE_RECOVERY_NONE BIT(0) /* optional telemetry collection */ #define DRM_WEDGE_RECOVERY_REBIND BIT(1) /* unbind + bind driver */ #define DRM_WEDGE_RECOVERY_BUS_RESET BIT(2) /* unbind + reset bus device + bind */ #define DRM_WEDGE_RECOVERY_VENDOR BIT(3) /* vendor specific recovery method */ /** * struct drm_wedge_task_info - information about the guilty task of a wedge dev */ struct drm_wedge_task_info { /** @pid: pid of the task */ pid_t pid; /** @comm: command name of the task */ char comm[TASK_COMM_LEN]; }; /** * enum switch_power_state - power state of drm device */ enum switch_power_state { /** @DRM_SWITCH_POWER_ON: Power state is ON */ DRM_SWITCH_POWER_ON = 0, /** @DRM_SWITCH_POWER_OFF: Power state is OFF */ DRM_SWITCH_POWER_OFF = 1, /** @DRM_SWITCH_POWER_CHANGING: Power state is changing */ DRM_SWITCH_POWER_CHANGING = 2, /** @DRM_SWITCH_POWER_DYNAMIC_OFF: Suspended */ DRM_SWITCH_POWER_DYNAMIC_OFF = 3, }; /** * struct drm_device - DRM device structure * * This structure represent a complete card that * may contain multiple heads. */ struct drm_device { /** @if_version: Highest interface version set */ int if_version; /** @ref: Object ref-count */ struct kref ref; /** @dev: Device structure of bus-device */ struct device *dev; /** * @dma_dev: * * Device for DMA operations. Only required if the device @dev * cannot perform DMA by itself. Should be NULL otherwise. Call * drm_dev_dma_dev() to get the DMA device instead of using this * field directly. Call drm_dev_set_dma_dev() to set this field. * * DRM devices are sometimes bound to virtual devices that cannot * perform DMA by themselves. Drivers should set this field to the * respective DMA controller. * * Devices on USB and other peripheral busses also cannot perform * DMA by themselves. The @dma_dev field should point the bus * controller that does DMA on behalve of such a device. Required * for importing buffers via dma-buf. * * If set, the DRM core automatically releases the reference on the * device. */ struct device *dma_dev; /** * @managed: * * Managed resources linked to the lifetime of this &drm_device as * tracked by @ref. */ struct { /** @managed.resources: managed resources list */ struct list_head resources; /** @managed.final_kfree: pointer for final kfree() call */ void *final_kfree; /** @managed.lock: protects @managed.resources */ spinlock_t lock; } managed; /** @driver: DRM driver managing the device */ const struct drm_driver *driver; /** * @dev_private: * * DRM driver private data. This is deprecated and should be left set to * NULL. * * Instead of using this pointer it is recommended that drivers use * devm_drm_dev_alloc() and embed struct &drm_device in their larger * per-device structure. */ void *dev_private; /** * @primary: * * Primary node. Drivers should not interact with this * directly. debugfs interfaces can be registered with * drm_debugfs_add_file(), and sysfs should be directly added on the * hardware (and not character device node) struct device @dev. */ struct drm_minor *primary; /** * @render: * * Render node. Drivers should not interact with this directly ever. * Drivers should not expose any additional interfaces in debugfs or * sysfs on this node. */ struct drm_minor *render; /** @accel: Compute Acceleration node */ struct drm_minor *accel; /** * @registered: * * Internally used by drm_dev_register() and drm_connector_register(). */ bool registered; /** * @master: * * Currently active master for this device. * Protected by &master_mutex */ struct drm_master *master; #ifdef CONFIG_TRANSPARENT_HUGEPAGE /** * @huge_mnt: * * Huge tmpfs mountpoint used at GEM object initialization * drm_gem_object_init(). Drivers can call drm_gem_huge_mnt_create() to * create, mount and use it. The default tmpfs mountpoint (`shm_mnt`) is * used if NULL. */ struct vfsmount *huge_mnt; #endif /** * @driver_features: per-device driver features * * Drivers can clear specific flags here to disallow * certain features on a per-device basis while still * sharing a single &struct drm_driver instance across * all devices. */ u32 driver_features; /** * @unplugged: * * Flag to tell if the device has been unplugged. * See drm_dev_enter() and drm_dev_is_unplugged(). */ bool unplugged; /** @anon_inode: inode for private address-space */ struct inode *anon_inode; /** @unique: Unique name of the device */ char *unique; /** * @master_mutex: * * Lock for &drm_minor.master and &drm_file.is_master */ struct mutex master_mutex; /** * @open_count: * * Usage counter for outstanding files open, * protected by drm_global_mutex */ atomic_t open_count; /** @filelist_mutex: Protects @filelist. */ struct mutex filelist_mutex; /** * @filelist: * * List of userspace clients, linked through &drm_file.lhead. */ struct list_head filelist; /** * @filelist_internal: * * List of open DRM files for in-kernel clients. * Protected by &filelist_mutex. */ struct list_head filelist_internal; /** * @clientlist_mutex: * * Protects &clientlist access. */ struct mutex clientlist_mutex; /** * @clientlist: * * List of in-kernel clients. Protected by &clientlist_mutex. */ struct list_head clientlist; /** * @client_sysrq_list: * * Entry into list of devices registered for sysrq. Allows in-kernel * clients on this device to handle sysrq keys. */ struct list_head client_sysrq_list; /** * @vblank_disable_immediate: * * If true, vblank interrupt will be disabled immediately when the * refcount drops to zero, as opposed to via the vblank disable * timer. * * This can be set to true it the hardware has a working vblank counter * with high-precision timestamping (otherwise there are races) and the * driver uses drm_crtc_vblank_on() and drm_crtc_vblank_off() * appropriately. Also, see @max_vblank_count, * &drm_crtc_funcs.get_vblank_counter and * &drm_vblank_crtc_config.disable_immediate. */ bool vblank_disable_immediate; /** * @vblank: * * Array of vblank tracking structures, one per &struct drm_crtc. For * historical reasons (vblank support predates kernel modesetting) this * is free-standing and not part of &struct drm_crtc itself. It must be * initialized explicitly by calling drm_vblank_init(). */ struct drm_vblank_crtc *vblank; /** * @vblank_time_lock: * * Protects vblank count and time updates during vblank enable/disable */ spinlock_t vblank_time_lock; /** * @vbl_lock: Top-level vblank references lock, wraps the low-level * @vblank_time_lock. */ spinlock_t vbl_lock; /** * @max_vblank_count: * * Maximum value of the vblank registers. This value +1 will result in a * wrap-around of the vblank register. It is used by the vblank core to * handle wrap-arounds. * * If set to zero the vblank core will try to guess the elapsed vblanks * between times when the vblank interrupt is disabled through * high-precision timestamps. That approach is suffering from small * races and imprecision over longer time periods, hence exposing a * hardware vblank counter is always recommended. * * This is the statically configured device wide maximum. The driver * can instead choose to use a runtime configurable per-crtc value * &drm_vblank_crtc.max_vblank_count, in which case @max_vblank_count * must be left at zero. See drm_crtc_set_max_vblank_count() on how * to use the per-crtc value. * * If non-zero, &drm_crtc_funcs.get_vblank_counter must be set. */ u32 max_vblank_count; /** @vblank_event_list: List of vblank events */ struct list_head vblank_event_list; /** * @event_lock: * * Protects @vblank_event_list and event delivery in * general. See drm_send_event() and drm_send_event_locked(). */ spinlock_t event_lock; /** @num_crtcs: Number of CRTCs on this device */ unsigned int num_crtcs; /** @mode_config: Current mode config */ struct drm_mode_config mode_config; /** @object_name_lock: GEM information */ struct mutex object_name_lock; /** @object_name_idr: GEM information */ struct idr object_name_idr; /** @vma_offset_manager: GEM information */ struct drm_vma_offset_manager *vma_offset_manager; /** @vram_mm: VRAM MM memory manager */ struct drm_vram_mm *vram_mm; /** * @switch_power_state: * * Power state of the client. * Used by drivers supporting the switcheroo driver. * The state is maintained in the * &vga_switcheroo_client_ops.set_gpu_state callback */ enum switch_power_state switch_power_state; /** * @fb_helper: * * Pointer to the fbdev emulation structure. * Set by drm_fb_helper_init() and cleared by drm_fb_helper_fini(). */ struct drm_fb_helper *fb_helper; /** * @debugfs_root: * * Root directory for debugfs files. */ struct dentry *debugfs_root; }; void drm_dev_set_dma_dev(struct drm_device *dev, struct device *dma_dev); /** * drm_dev_dma_dev - returns the DMA device for a DRM device * @dev: DRM device * * Returns the DMA device of the given DRM device. By default, this * the DRM device's parent. See drm_dev_set_dma_dev(). * * Returns: * A DMA-capable device for the DRM device. */ static inline struct device *drm_dev_dma_dev(struct drm_device *dev) { if (dev->dma_dev) return dev->dma_dev; return dev->dev; } #endif
