#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 <drm/drm_hashtab.h>
#include <drm/drm_mode_config.h>

struct drm_driver;
struct drm_minor;
struct drm_master;
struct drm_device_dma;
struct drm_vblank_crtc;
struct drm_sg_mem;
struct drm_local_map;
struct drm_vma_offset_manager;
struct drm_vram_mm;
struct drm_fb_helper;

struct inode;

struct pci_dev;
struct pci_controller;


/**
 * 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;

        /**
         * @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 */
        struct drm_minor *primary;

        /** @render: Render node */
        struct drm_minor *render;

        /**
         * @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)
         *
         * WARNING:
         * Only drivers annotated with DRIVER_LEGACY should be using this.
         */
        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. See also @max_vblank_count and
         * &drm_crtc_funcs.get_vblank_counter.
         */
        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;

        /* Everything below here is for legacy driver, never use! */
        /* private: */
#if IS_ENABLED(CONFIG_DRM_LEGACY)
        /* List of devices per driver for stealth attach cleanup */
        struct list_head legacy_dev_list;

#ifdef __alpha__
        /** @hose: PCI hose, only used on ALPHA platforms. */
        struct pci_controller *hose;
#endif

        /* AGP data */
        struct drm_agp_head *agp;

        /* Context handle management - linked list of context handles */
        struct list_head ctxlist;

        /* Context handle management - mutex for &ctxlist */
        struct mutex ctxlist_mutex;

        /* Context handle management */
        struct idr ctx_idr;

        /* Memory management - linked list of regions */
        struct list_head maplist;

        /* Memory management - user token hash table for maps */
        struct drm_open_hash map_hash;

        /* Context handle management - list of vmas (for debugging) */
        struct list_head vmalist;

        /* Optional pointer for DMA support */
        struct drm_device_dma *dma;

        /* Context swapping flag */
        __volatile__ long context_flag;

        /* Last current context */
        int last_context;

        /* Lock for &buf_use and a few other things. */
        spinlock_t buf_lock;

        /* Usage counter for buffers in use -- cannot alloc */
        int buf_use;

        /* Buffer allocation in progress */
        atomic_t buf_alloc;

        struct {
                int context;
                struct drm_hw_lock *lock;
        } sigdata;

        struct drm_local_map *agp_buffer_map;
        unsigned int agp_buffer_token;

        /* Scatter gather memory */
        struct drm_sg_mem *sg;

        /* IRQs */
        bool irq_enabled;
        int irq;
#endif
};

#endif