#ifndef _DRM_DEVICE_H_
#define _DRM_DEVICE_H_
#include <linux/list.h>
#include <linux/kref.h>
#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 .
*/
#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 */
/**
* 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;
/**
* @ 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;
/**
* @ struct_mutex :
*
* Lock for others ( not & drm_minor . master and & drm_file . is_master )
*
* TODO : This lock used to be the BKL of the DRM subsystem . Move the
* lock into i915 , which is the only remaining user .
*/
struct mutex struct_mutex;
/**
* @ 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;
/**
* @ 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
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