Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

[cris-mirror.git] / drivers / gpu / drm / i915 / i915_drv.h

/* i915_drv.h -- Private header for the I915 driver -*- linux-c -*-
 */
/*
 *
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#ifndef _I915_DRV_H_
#define _I915_DRV_H_

#include <uapi/drm/i915_drm.h>
#include <uapi/drm/drm_fourcc.h>

#include <linux/io-mapping.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/backlight.h>
#include <linux/hash.h>
#include <linux/intel-iommu.h>
#include <linux/kref.h>
#include <linux/perf_event.h>
#include <linux/pm_qos.h>
#include <linux/reservation.h>
#include <linux/shmem_fs.h>

#include <drm/drmP.h>
#include <drm/intel-gtt.h>
#include <drm/drm_legacy.h> /* for struct drm_dma_handle */
#include <drm/drm_gem.h>
#include <drm/drm_auth.h>
#include <drm/drm_cache.h>

#include "i915_params.h"
#include "i915_reg.h"
#include "i915_utils.h"

#include "intel_bios.h"
#include "intel_device_info.h"
#include "intel_display.h"
#include "intel_dpll_mgr.h"
#include "intel_lrc.h"
#include "intel_opregion.h"
#include "intel_ringbuffer.h"
#include "intel_uncore.h"
#include "intel_uc.h"

#include "i915_gem.h"
#include "i915_gem_context.h"
#include "i915_gem_fence_reg.h"
#include "i915_gem_object.h"
#include "i915_gem_gtt.h"
#include "i915_gem_request.h"
#include "i915_gem_timeline.h"

#include "i915_vma.h"

#include "intel_gvt.h"

/* General customization:
 */

#define DRIVER_NAME             "i915"
#define DRIVER_DESC             "Intel Graphics"
#define DRIVER_DATE             "20171222"
#define DRIVER_TIMESTAMP        1513971710

/* Use I915_STATE_WARN(x) and I915_STATE_WARN_ON() (rather than WARN() and
 * WARN_ON()) for hw state sanity checks to check for unexpected conditions
 * which may not necessarily be a user visible problem.  This will either
 * WARN() or DRM_ERROR() depending on the verbose_checks moduleparam, to
 * enable distros and users to tailor their preferred amount of i915 abrt
 * spam.
 */
#define I915_STATE_WARN(condition, format...) ({                        \
        int __ret_warn_on = !!(condition);                              \
        if (unlikely(__ret_warn_on))                                    \
                if (!WARN(i915_modparams.verbose_state_checks, format)) \
                        DRM_ERROR(format);                              \
        unlikely(__ret_warn_on);                                        \
})

#define I915_STATE_WARN_ON(x)                                           \
        I915_STATE_WARN((x), "%s", "WARN_ON(" __stringify(x) ")")

bool __i915_inject_load_failure(const char *func, int line);
#define i915_inject_load_failure() \
        __i915_inject_load_failure(__func__, __LINE__)

typedef struct {
        uint32_t val;
} uint_fixed_16_16_t;

#define FP_16_16_MAX ({ \
        uint_fixed_16_16_t fp; \
        fp.val = UINT_MAX; \
        fp; \
})

static inline bool is_fixed16_zero(uint_fixed_16_16_t val)
{
        if (val.val == 0)
                return true;
        return false;
}

static inline uint_fixed_16_16_t u32_to_fixed16(uint32_t val)
{
        uint_fixed_16_16_t fp;

        WARN_ON(val > U16_MAX);

        fp.val = val << 16;
        return fp;
}

static inline uint32_t fixed16_to_u32_round_up(uint_fixed_16_16_t fp)
{
        return DIV_ROUND_UP(fp.val, 1 << 16);
}

static inline uint32_t fixed16_to_u32(uint_fixed_16_16_t fp)
{
        return fp.val >> 16;
}

static inline uint_fixed_16_16_t min_fixed16(uint_fixed_16_16_t min1,
                                                 uint_fixed_16_16_t min2)
{
        uint_fixed_16_16_t min;

        min.val = min(min1.val, min2.val);
        return min;
}

static inline uint_fixed_16_16_t max_fixed16(uint_fixed_16_16_t max1,
                                                 uint_fixed_16_16_t max2)
{
        uint_fixed_16_16_t max;

        max.val = max(max1.val, max2.val);
        return max;
}

static inline uint_fixed_16_16_t clamp_u64_to_fixed16(uint64_t val)
{
        uint_fixed_16_16_t fp;
        WARN_ON(val > U32_MAX);
        fp.val = (uint32_t) val;
        return fp;
}

static inline uint32_t div_round_up_fixed16(uint_fixed_16_16_t val,
                                            uint_fixed_16_16_t d)
{
        return DIV_ROUND_UP(val.val, d.val);
}

static inline uint32_t mul_round_up_u32_fixed16(uint32_t val,
                                                uint_fixed_16_16_t mul)
{
        uint64_t intermediate_val;

        intermediate_val = (uint64_t) val * mul.val;
        intermediate_val = DIV_ROUND_UP_ULL(intermediate_val, 1 << 16);
        WARN_ON(intermediate_val > U32_MAX);
        return (uint32_t) intermediate_val;
}

static inline uint_fixed_16_16_t mul_fixed16(uint_fixed_16_16_t val,
                                             uint_fixed_16_16_t mul)
{
        uint64_t intermediate_val;

        intermediate_val = (uint64_t) val.val * mul.val;
        intermediate_val = intermediate_val >> 16;
        return clamp_u64_to_fixed16(intermediate_val);
}

static inline uint_fixed_16_16_t div_fixed16(uint32_t val, uint32_t d)
{
        uint64_t interm_val;

        interm_val = (uint64_t)val << 16;
        interm_val = DIV_ROUND_UP_ULL(interm_val, d);
        return clamp_u64_to_fixed16(interm_val);
}

static inline uint32_t div_round_up_u32_fixed16(uint32_t val,
                                                uint_fixed_16_16_t d)
{
        uint64_t interm_val;

        interm_val = (uint64_t)val << 16;
        interm_val = DIV_ROUND_UP_ULL(interm_val, d.val);
        WARN_ON(interm_val > U32_MAX);
        return (uint32_t) interm_val;
}

static inline uint_fixed_16_16_t mul_u32_fixed16(uint32_t val,
                                                     uint_fixed_16_16_t mul)
{
        uint64_t intermediate_val;

        intermediate_val = (uint64_t) val * mul.val;
        return clamp_u64_to_fixed16(intermediate_val);
}

static inline uint_fixed_16_16_t add_fixed16(uint_fixed_16_16_t add1,
                                             uint_fixed_16_16_t add2)
{
        uint64_t interm_sum;

        interm_sum = (uint64_t) add1.val + add2.val;
        return clamp_u64_to_fixed16(interm_sum);
}

static inline uint_fixed_16_16_t add_fixed16_u32(uint_fixed_16_16_t add1,
                                                 uint32_t add2)
{
        uint64_t interm_sum;
        uint_fixed_16_16_t interm_add2 = u32_to_fixed16(add2);

        interm_sum = (uint64_t) add1.val + interm_add2.val;
        return clamp_u64_to_fixed16(interm_sum);
}

enum hpd_pin {
        HPD_NONE = 0,
        HPD_TV = HPD_NONE,     /* TV is known to be unreliable */
        HPD_CRT,
        HPD_SDVO_B,
        HPD_SDVO_C,
        HPD_PORT_A,
        HPD_PORT_B,
        HPD_PORT_C,
        HPD_PORT_D,
        HPD_PORT_E,
        HPD_NUM_PINS
};

#define for_each_hpd_pin(__pin) \
        for ((__pin) = (HPD_NONE + 1); (__pin) < HPD_NUM_PINS; (__pin)++)

#define HPD_STORM_DEFAULT_THRESHOLD 5

struct i915_hotplug {
        struct work_struct hotplug_work;

        struct {
                unsigned long last_jiffies;
                int count;
                enum {
                        HPD_ENABLED = 0,
                        HPD_DISABLED = 1,
                        HPD_MARK_DISABLED = 2
                } state;
        } stats[HPD_NUM_PINS];
        u32 event_bits;
        struct delayed_work reenable_work;

        struct intel_digital_port *irq_port[I915_MAX_PORTS];
        u32 long_port_mask;
        u32 short_port_mask;
        struct work_struct dig_port_work;

        struct work_struct poll_init_work;
        bool poll_enabled;

        unsigned int hpd_storm_threshold;

        /*
         * if we get a HPD irq from DP and a HPD irq from non-DP
         * the non-DP HPD could block the workqueue on a mode config
         * mutex getting, that userspace may have taken. However
         * userspace is waiting on the DP workqueue to run which is
         * blocked behind the non-DP one.
         */
        struct workqueue_struct *dp_wq;
};

#define I915_GEM_GPU_DOMAINS \
        (I915_GEM_DOMAIN_RENDER | \
         I915_GEM_DOMAIN_SAMPLER | \
         I915_GEM_DOMAIN_COMMAND | \
         I915_GEM_DOMAIN_INSTRUCTION | \
         I915_GEM_DOMAIN_VERTEX)

struct drm_i915_private;
struct i915_mm_struct;
struct i915_mmu_object;

struct drm_i915_file_private {
        struct drm_i915_private *dev_priv;
        struct drm_file *file;

        struct {
                spinlock_t lock;
                struct list_head request_list;
/* 20ms is a fairly arbitrary limit (greater than the average frame time)
 * chosen to prevent the CPU getting more than a frame ahead of the GPU
 * (when using lax throttling for the frontbuffer). We also use it to
 * offer free GPU waitboosts for severely congested workloads.
 */
#define DRM_I915_THROTTLE_JIFFIES msecs_to_jiffies(20)
        } mm;
        struct idr context_idr;

        struct intel_rps_client {
                atomic_t boosts;
        } rps_client;

        unsigned int bsd_engine;

/* Client can have a maximum of 3 contexts banned before
 * it is denied of creating new contexts. As one context
 * ban needs 4 consecutive hangs, and more if there is
 * progress in between, this is a last resort stop gap measure
 * to limit the badly behaving clients access to gpu.
 */
#define I915_MAX_CLIENT_CONTEXT_BANS 3
        atomic_t context_bans;
};

/* Interface history:
 *
 * 1.1: Original.
 * 1.2: Add Power Management
 * 1.3: Add vblank support
 * 1.4: Fix cmdbuffer path, add heap destroy
 * 1.5: Add vblank pipe configuration
 * 1.6: - New ioctl for scheduling buffer swaps on vertical blank
 *      - Support vertical blank on secondary display pipe
 */
#define DRIVER_MAJOR            1
#define DRIVER_MINOR            6
#define DRIVER_PATCHLEVEL       0

struct intel_overlay;
struct intel_overlay_error_state;

struct sdvo_device_mapping {
        u8 initialized;
        u8 dvo_port;
        u8 slave_addr;
        u8 dvo_wiring;
        u8 i2c_pin;
        u8 ddc_pin;
};

struct intel_connector;
struct intel_encoder;
struct intel_atomic_state;
struct intel_crtc_state;
struct intel_initial_plane_config;
struct intel_crtc;
struct intel_limit;
struct dpll;
struct intel_cdclk_state;

struct drm_i915_display_funcs {
        void (*get_cdclk)(struct drm_i915_private *dev_priv,
                          struct intel_cdclk_state *cdclk_state);
        void (*set_cdclk)(struct drm_i915_private *dev_priv,
                          const struct intel_cdclk_state *cdclk_state);
        int (*get_fifo_size)(struct drm_i915_private *dev_priv,
                             enum i9xx_plane_id i9xx_plane);
        int (*compute_pipe_wm)(struct intel_crtc_state *cstate);
        int (*compute_intermediate_wm)(struct drm_device *dev,
                                       struct intel_crtc *intel_crtc,
                                       struct intel_crtc_state *newstate);
        void (*initial_watermarks)(struct intel_atomic_state *state,
                                   struct intel_crtc_state *cstate);
        void (*atomic_update_watermarks)(struct intel_atomic_state *state,
                                         struct intel_crtc_state *cstate);
        void (*optimize_watermarks)(struct intel_atomic_state *state,
                                    struct intel_crtc_state *cstate);
        int (*compute_global_watermarks)(struct drm_atomic_state *state);
        void (*update_wm)(struct intel_crtc *crtc);
        int (*modeset_calc_cdclk)(struct drm_atomic_state *state);
        /* Returns the active state of the crtc, and if the crtc is active,
         * fills out the pipe-config with the hw state. */
        bool (*get_pipe_config)(struct intel_crtc *,
                                struct intel_crtc_state *);
        void (*get_initial_plane_config)(struct intel_crtc *,
                                         struct intel_initial_plane_config *);
        int (*crtc_compute_clock)(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state);
        void (*crtc_enable)(struct intel_crtc_state *pipe_config,
                            struct drm_atomic_state *old_state);
        void (*crtc_disable)(struct intel_crtc_state *old_crtc_state,
                             struct drm_atomic_state *old_state);
        void (*update_crtcs)(struct drm_atomic_state *state);
        void (*audio_codec_enable)(struct intel_encoder *encoder,
                                   const struct intel_crtc_state *crtc_state,
                                   const struct drm_connector_state *conn_state);
        void (*audio_codec_disable)(struct intel_encoder *encoder,
                                    const struct intel_crtc_state *old_crtc_state,
                                    const struct drm_connector_state *old_conn_state);
        void (*fdi_link_train)(struct intel_crtc *crtc,
                               const struct intel_crtc_state *crtc_state);
        void (*init_clock_gating)(struct drm_i915_private *dev_priv);
        void (*hpd_irq_setup)(struct drm_i915_private *dev_priv);
        /* clock updates for mode set */
        /* cursor updates */
        /* render clock increase/decrease */
        /* display clock increase/decrease */
        /* pll clock increase/decrease */

        void (*load_csc_matrix)(struct drm_crtc_state *crtc_state);
        void (*load_luts)(struct drm_crtc_state *crtc_state);
};

#define CSR_VERSION(major, minor)       ((major) << 16 | (minor))
#define CSR_VERSION_MAJOR(version)      ((version) >> 16)
#define CSR_VERSION_MINOR(version)      ((version) & 0xffff)

struct intel_csr {
        struct work_struct work;
        const char *fw_path;
        uint32_t *dmc_payload;
        uint32_t dmc_fw_size;
        uint32_t version;
        uint32_t mmio_count;
        i915_reg_t mmioaddr[8];
        uint32_t mmiodata[8];
        uint32_t dc_state;
        uint32_t allowed_dc_mask;
};

struct intel_display_error_state;

struct i915_gpu_state {
        struct kref ref;
        struct timeval time;
        struct timeval boottime;
        struct timeval uptime;

        struct drm_i915_private *i915;

        char error_msg[128];
        bool simulated;
        bool awake;
        bool wakelock;
        bool suspended;
        int iommu;
        u32 reset_count;
        u32 suspend_count;
        struct intel_device_info device_info;
        struct i915_params params;

        struct i915_error_uc {
                struct intel_uc_fw guc_fw;
                struct intel_uc_fw huc_fw;
                struct drm_i915_error_object *guc_log;
        } uc;

        /* Generic register state */
        u32 eir;
        u32 pgtbl_er;
        u32 ier;
        u32 gtier[4], ngtier;
        u32 ccid;
        u32 derrmr;
        u32 forcewake;
        u32 error; /* gen6+ */
        u32 err_int; /* gen7 */
        u32 fault_data0; /* gen8, gen9 */
        u32 fault_data1; /* gen8, gen9 */
        u32 done_reg;
        u32 gac_eco;
        u32 gam_ecochk;
        u32 gab_ctl;
        u32 gfx_mode;

        u32 nfence;
        u64 fence[I915_MAX_NUM_FENCES];
        struct intel_overlay_error_state *overlay;
        struct intel_display_error_state *display;

        struct drm_i915_error_engine {
                int engine_id;
                /* Software tracked state */
                bool idle;
                bool waiting;
                int num_waiters;
                unsigned long hangcheck_timestamp;
                bool hangcheck_stalled;
                enum intel_engine_hangcheck_action hangcheck_action;
                struct i915_address_space *vm;
                int num_requests;
                u32 reset_count;

                /* position of active request inside the ring */
                u32 rq_head, rq_post, rq_tail;

                /* our own tracking of ring head and tail */
                u32 cpu_ring_head;
                u32 cpu_ring_tail;

                u32 last_seqno;

                /* Register state */
                u32 start;
                u32 tail;
                u32 head;
                u32 ctl;
                u32 mode;
                u32 hws;
                u32 ipeir;
                u32 ipehr;
                u32 bbstate;
                u32 instpm;
                u32 instps;
                u32 seqno;
                u64 bbaddr;
                u64 acthd;
                u32 fault_reg;
                u64 faddr;
                u32 rc_psmi; /* sleep state */
                u32 semaphore_mboxes[I915_NUM_ENGINES - 1];
                struct intel_instdone instdone;

                struct drm_i915_error_context {
                        char comm[TASK_COMM_LEN];
                        pid_t pid;
                        u32 handle;
                        u32 hw_id;
                        int priority;
                        int ban_score;
                        int active;
                        int guilty;
                } context;

                struct drm_i915_error_object {
                        u64 gtt_offset;
                        u64 gtt_size;
                        int page_count;
                        int unused;
                        u32 *pages[0];
                } *ringbuffer, *batchbuffer, *wa_batchbuffer, *ctx, *hws_page;

                struct drm_i915_error_object **user_bo;
                long user_bo_count;

                struct drm_i915_error_object *wa_ctx;
                struct drm_i915_error_object *default_state;

                struct drm_i915_error_request {
                        long jiffies;
                        pid_t pid;
                        u32 context;
                        int priority;
                        int ban_score;
                        u32 seqno;
                        u32 head;
                        u32 tail;
                } *requests, execlist[EXECLIST_MAX_PORTS];
                unsigned int num_ports;

                struct drm_i915_error_waiter {
                        char comm[TASK_COMM_LEN];
                        pid_t pid;
                        u32 seqno;
                } *waiters;

                struct {
                        u32 gfx_mode;
                        union {
                                u64 pdp[4];
                                u32 pp_dir_base;
                        };
                } vm_info;
        } engine[I915_NUM_ENGINES];

        struct drm_i915_error_buffer {
                u32 size;
                u32 name;
                u32 rseqno[I915_NUM_ENGINES], wseqno;
                u64 gtt_offset;
                u32 read_domains;
                u32 write_domain;
                s32 fence_reg:I915_MAX_NUM_FENCE_BITS;
                u32 tiling:2;
                u32 dirty:1;
                u32 purgeable:1;
                u32 userptr:1;
                s32 engine:4;
                u32 cache_level:3;
        } *active_bo[I915_NUM_ENGINES], *pinned_bo;
        u32 active_bo_count[I915_NUM_ENGINES], pinned_bo_count;
        struct i915_address_space *active_vm[I915_NUM_ENGINES];
};

enum i915_cache_level {
        I915_CACHE_NONE = 0,
        I915_CACHE_LLC, /* also used for snoopable memory on non-LLC */
        I915_CACHE_L3_LLC, /* gen7+, L3 sits between the domain specifc
                              caches, eg sampler/render caches, and the
                              large Last-Level-Cache. LLC is coherent with
                              the CPU, but L3 is only visible to the GPU. */
        I915_CACHE_WT, /* hsw:gt3e WriteThrough for scanouts */
};

#define I915_COLOR_UNEVICTABLE (-1) /* a non-vma sharing the address space */

enum fb_op_origin {
        ORIGIN_GTT,
        ORIGIN_CPU,
        ORIGIN_CS,
        ORIGIN_FLIP,
        ORIGIN_DIRTYFB,
};

struct intel_fbc {
        /* This is always the inner lock when overlapping with struct_mutex and
         * it's the outer lock when overlapping with stolen_lock. */
        struct mutex lock;
        unsigned threshold;
        unsigned int possible_framebuffer_bits;
        unsigned int busy_bits;
        unsigned int visible_pipes_mask;
        struct intel_crtc *crtc;

        struct drm_mm_node compressed_fb;
        struct drm_mm_node *compressed_llb;

        bool false_color;

        bool enabled;
        bool active;

        bool underrun_detected;
        struct work_struct underrun_work;

        /*
         * Due to the atomic rules we can't access some structures without the
         * appropriate locking, so we cache information here in order to avoid
         * these problems.
         */
        struct intel_fbc_state_cache {
                struct i915_vma *vma;

                struct {
                        unsigned int mode_flags;
                        uint32_t hsw_bdw_pixel_rate;
                } crtc;

                struct {
                        unsigned int rotation;
                        int src_w;
                        int src_h;
                        bool visible;
                        /*
                         * Display surface base address adjustement for
                         * pageflips. Note that on gen4+ this only adjusts up
                         * to a tile, offsets within a tile are handled in
                         * the hw itself (with the TILEOFF register).
                         */
                        int adjusted_x;
                        int adjusted_y;

                        int y;
                } plane;

                struct {
                        const struct drm_format_info *format;
                        unsigned int stride;
                } fb;
        } state_cache;

        /*
         * This structure contains everything that's relevant to program the
         * hardware registers. When we want to figure out if we need to disable
         * and re-enable FBC for a new configuration we just check if there's
         * something different in the struct. The genx_fbc_activate functions
         * are supposed to read from it in order to program the registers.
         */
        struct intel_fbc_reg_params {
                struct i915_vma *vma;

                struct {
                        enum pipe pipe;
                        enum i9xx_plane_id i9xx_plane;
                        unsigned int fence_y_offset;
                } crtc;

                struct {
                        const struct drm_format_info *format;
                        unsigned int stride;
                } fb;

                int cfb_size;
                unsigned int gen9_wa_cfb_stride;
        } params;

        struct intel_fbc_work {
                bool scheduled;
                u32 scheduled_vblank;
                struct work_struct work;
        } work;

        const char *no_fbc_reason;
};

/*
 * HIGH_RR is the highest eDP panel refresh rate read from EDID
 * LOW_RR is the lowest eDP panel refresh rate found from EDID
 * parsing for same resolution.
 */
enum drrs_refresh_rate_type {
        DRRS_HIGH_RR,
        DRRS_LOW_RR,
        DRRS_MAX_RR, /* RR count */
};

enum drrs_support_type {
        DRRS_NOT_SUPPORTED = 0,
        STATIC_DRRS_SUPPORT = 1,
        SEAMLESS_DRRS_SUPPORT = 2
};

struct intel_dp;
struct i915_drrs {
        struct mutex mutex;
        struct delayed_work work;
        struct intel_dp *dp;
        unsigned busy_frontbuffer_bits;
        enum drrs_refresh_rate_type refresh_rate_type;
        enum drrs_support_type type;
};

struct i915_psr {
        struct mutex lock;
        bool sink_support;
        bool source_ok;
        struct intel_dp *enabled;
        bool active;
        struct delayed_work work;
        unsigned busy_frontbuffer_bits;
        bool psr2_support;
        bool aux_frame_sync;
        bool link_standby;
        bool y_cord_support;
        bool colorimetry_support;
        bool alpm;

        void (*enable_source)(struct intel_dp *,
                              const struct intel_crtc_state *);
        void (*disable_source)(struct intel_dp *,
                               const struct intel_crtc_state *);
        void (*enable_sink)(struct intel_dp *);
        void (*activate)(struct intel_dp *);
        void (*setup_vsc)(struct intel_dp *, const struct intel_crtc_state *);
};

enum intel_pch {
        PCH_NONE = 0,   /* No PCH present */
        PCH_IBX,        /* Ibexpeak PCH */
        PCH_CPT,        /* Cougarpoint/Pantherpoint PCH */
        PCH_LPT,        /* Lynxpoint/Wildcatpoint PCH */
        PCH_SPT,        /* Sunrisepoint PCH */
        PCH_KBP,        /* Kaby Lake PCH */
        PCH_CNP,        /* Cannon Lake PCH */
        PCH_NOP,
};

enum intel_sbi_destination {
        SBI_ICLK,
        SBI_MPHY,
};

#define QUIRK_LVDS_SSC_DISABLE (1<<1)
#define QUIRK_INVERT_BRIGHTNESS (1<<2)
#define QUIRK_BACKLIGHT_PRESENT (1<<3)
#define QUIRK_PIN_SWIZZLED_PAGES (1<<5)
#define QUIRK_INCREASE_T12_DELAY (1<<6)

struct intel_fbdev;
struct intel_fbc_work;

struct intel_gmbus {
        struct i2c_adapter adapter;
#define GMBUS_FORCE_BIT_RETRY (1U << 31)
        u32 force_bit;
        u32 reg0;
        i915_reg_t gpio_reg;
        struct i2c_algo_bit_data bit_algo;
        struct drm_i915_private *dev_priv;
};

struct i915_suspend_saved_registers {
        u32 saveDSPARB;
        u32 saveFBC_CONTROL;
        u32 saveCACHE_MODE_0;
        u32 saveMI_ARB_STATE;
        u32 saveSWF0[16];
        u32 saveSWF1[16];
        u32 saveSWF3[3];
        uint64_t saveFENCE[I915_MAX_NUM_FENCES];
        u32 savePCH_PORT_HOTPLUG;
        u16 saveGCDGMBUS;
};

struct vlv_s0ix_state {
        /* GAM */
        u32 wr_watermark;
        u32 gfx_prio_ctrl;
        u32 arb_mode;
        u32 gfx_pend_tlb0;
        u32 gfx_pend_tlb1;
        u32 lra_limits[GEN7_LRA_LIMITS_REG_NUM];
        u32 media_max_req_count;
        u32 gfx_max_req_count;
        u32 render_hwsp;
        u32 ecochk;
        u32 bsd_hwsp;
        u32 blt_hwsp;
        u32 tlb_rd_addr;

        /* MBC */
        u32 g3dctl;
        u32 gsckgctl;
        u32 mbctl;

        /* GCP */
        u32 ucgctl1;
        u32 ucgctl3;
        u32 rcgctl1;
        u32 rcgctl2;
        u32 rstctl;
        u32 misccpctl;

        /* GPM */
        u32 gfxpause;
        u32 rpdeuhwtc;
        u32 rpdeuc;
        u32 ecobus;
        u32 pwrdwnupctl;
        u32 rp_down_timeout;
        u32 rp_deucsw;
        u32 rcubmabdtmr;
        u32 rcedata;
        u32 spare2gh;

        /* Display 1 CZ domain */
        u32 gt_imr;
        u32 gt_ier;
        u32 pm_imr;
        u32 pm_ier;
        u32 gt_scratch[GEN7_GT_SCRATCH_REG_NUM];

        /* GT SA CZ domain */
        u32 tilectl;
        u32 gt_fifoctl;
        u32 gtlc_wake_ctrl;
        u32 gtlc_survive;
        u32 pmwgicz;

        /* Display 2 CZ domain */
        u32 gu_ctl0;
        u32 gu_ctl1;
        u32 pcbr;
        u32 clock_gate_dis2;
};

struct intel_rps_ei {
        ktime_t ktime;
        u32 render_c0;
        u32 media_c0;
};

struct intel_rps {
        /*
         * work, interrupts_enabled and pm_iir are protected by
         * dev_priv->irq_lock
         */
        struct work_struct work;
        bool interrupts_enabled;
        u32 pm_iir;

        /* PM interrupt bits that should never be masked */
        u32 pm_intrmsk_mbz;

        /* Frequencies are stored in potentially platform dependent multiples.
         * In other words, *_freq needs to be multiplied by X to be interesting.
         * Soft limits are those which are used for the dynamic reclocking done
         * by the driver (raise frequencies under heavy loads, and lower for
         * lighter loads). Hard limits are those imposed by the hardware.
         *
         * A distinction is made for overclocking, which is never enabled by
         * default, and is considered to be above the hard limit if it's
         * possible at all.
         */
        u8 cur_freq;            /* Current frequency (cached, may not == HW) */
        u8 min_freq_softlimit;  /* Minimum frequency permitted by the driver */
        u8 max_freq_softlimit;  /* Max frequency permitted by the driver */
        u8 max_freq;            /* Maximum frequency, RP0 if not overclocking */
        u8 min_freq;            /* AKA RPn. Minimum frequency */
        u8 boost_freq;          /* Frequency to request when wait boosting */
        u8 idle_freq;           /* Frequency to request when we are idle */
        u8 efficient_freq;      /* AKA RPe. Pre-determined balanced frequency */
        u8 rp1_freq;            /* "less than" RP0 power/freqency */
        u8 rp0_freq;            /* Non-overclocked max frequency. */
        u16 gpll_ref_freq;      /* vlv/chv GPLL reference frequency */

        u8 up_threshold; /* Current %busy required to uplock */
        u8 down_threshold; /* Current %busy required to downclock */

        int last_adj;
        enum { LOW_POWER, BETWEEN, HIGH_POWER } power;

        bool enabled;
        atomic_t num_waiters;
        atomic_t boosts;

        /* manual wa residency calculations */
        struct intel_rps_ei ei;
};

struct intel_rc6 {
        bool enabled;
};

struct intel_llc_pstate {
        bool enabled;
};

struct intel_gen6_power_mgmt {
        struct intel_rps rps;
        struct intel_rc6 rc6;
        struct intel_llc_pstate llc_pstate;
};

/* defined intel_pm.c */
extern spinlock_t mchdev_lock;

struct intel_ilk_power_mgmt {
        u8 cur_delay;
        u8 min_delay;
        u8 max_delay;
        u8 fmax;
        u8 fstart;

        u64 last_count1;
        unsigned long last_time1;
        unsigned long chipset_power;
        u64 last_count2;
        u64 last_time2;
        unsigned long gfx_power;
        u8 corr;

        int c_m;
        int r_t;
};

struct drm_i915_private;
struct i915_power_well;

struct i915_power_well_ops {
        /*
         * Synchronize the well's hw state to match the current sw state, for
         * example enable/disable it based on the current refcount. Called
         * during driver init and resume time, possibly after first calling
         * the enable/disable handlers.
         */
        void (*sync_hw)(struct drm_i915_private *dev_priv,
                        struct i915_power_well *power_well);
        /*
         * Enable the well and resources that depend on it (for example
         * interrupts located on the well). Called after the 0->1 refcount
         * transition.
         */
        void (*enable)(struct drm_i915_private *dev_priv,
                       struct i915_power_well *power_well);
        /*
         * Disable the well and resources that depend on it. Called after
         * the 1->0 refcount transition.
         */
        void (*disable)(struct drm_i915_private *dev_priv,
                        struct i915_power_well *power_well);
        /* Returns the hw enabled state. */
        bool (*is_enabled)(struct drm_i915_private *dev_priv,
                           struct i915_power_well *power_well);
};

/* Power well structure for haswell */
struct i915_power_well {
        const char *name;
        bool always_on;
        /* power well enable/disable usage count */
        int count;
        /* cached hw enabled state */
        bool hw_enabled;
        u64 domains;
        /* unique identifier for this power well */
        enum i915_power_well_id id;
        /*
         * Arbitraty data associated with this power well. Platform and power
         * well specific.
         */
        union {
                struct {
                        enum dpio_phy phy;
                } bxt;
                struct {
                        /* Mask of pipes whose IRQ logic is backed by the pw */
                        u8 irq_pipe_mask;
                        /* The pw is backing the VGA functionality */
                        bool has_vga:1;
                        bool has_fuses:1;
                } hsw;
        };
        const struct i915_power_well_ops *ops;
};

struct i915_power_domains {
        /*
         * Power wells needed for initialization at driver init and suspend
         * time are on. They are kept on until after the first modeset.
         */
        bool init_power_on;
        bool initializing;
        int power_well_count;

        struct mutex lock;
        int domain_use_count[POWER_DOMAIN_NUM];
        struct i915_power_well *power_wells;
};

#define MAX_L3_SLICES 2
struct intel_l3_parity {
        u32 *remap_info[MAX_L3_SLICES];
        struct work_struct error_work;
        int which_slice;
};

struct i915_gem_mm {
        /** Memory allocator for GTT stolen memory */
        struct drm_mm stolen;
        /** Protects the usage of the GTT stolen memory allocator. This is
         * always the inner lock when overlapping with struct_mutex. */
        struct mutex stolen_lock;

        /* Protects bound_list/unbound_list and #drm_i915_gem_object.mm.link */
        spinlock_t obj_lock;

        /** List of all objects in gtt_space. Used to restore gtt
         * mappings on resume */
        struct list_head bound_list;
        /**
         * List of objects which are not bound to the GTT (thus
         * are idle and not used by the GPU). These objects may or may
         * not actually have any pages attached.
         */
        struct list_head unbound_list;

        /** List of all objects in gtt_space, currently mmaped by userspace.
         * All objects within this list must also be on bound_list.
         */
        struct list_head userfault_list;

        /**
         * List of objects which are pending destruction.
         */
        struct llist_head free_list;
        struct work_struct free_work;
        spinlock_t free_lock;

        /**
         * Small stash of WC pages
         */
        struct pagevec wc_stash;

        /**
         * tmpfs instance used for shmem backed objects
         */
        struct vfsmount *gemfs;

        /** PPGTT used for aliasing the PPGTT with the GTT */
        struct i915_hw_ppgtt *aliasing_ppgtt;

        struct notifier_block oom_notifier;
        struct notifier_block vmap_notifier;
        struct shrinker shrinker;

        /** LRU list of objects with fence regs on them. */
        struct list_head fence_list;

        /**
         * Workqueue to fault in userptr pages, flushed by the execbuf
         * when required but otherwise left to userspace to try again
         * on EAGAIN.
         */
        struct workqueue_struct *userptr_wq;

        u64 unordered_timeline;

        /* the indicator for dispatch video commands on two BSD rings */
        atomic_t bsd_engine_dispatch_index;

        /** Bit 6 swizzling required for X tiling */
        uint32_t bit_6_swizzle_x;
        /** Bit 6 swizzling required for Y tiling */
        uint32_t bit_6_swizzle_y;

        /* accounting, useful for userland debugging */
        spinlock_t object_stat_lock;
        u64 object_memory;
        u32 object_count;
};

struct drm_i915_error_state_buf {
        struct drm_i915_private *i915;
        unsigned bytes;
        unsigned size;
        int err;
        u8 *buf;
        loff_t start;
        loff_t pos;
};

#define I915_IDLE_ENGINES_TIMEOUT (200) /* in ms */

#define I915_RESET_TIMEOUT (10 * HZ) /* 10s */
#define I915_FENCE_TIMEOUT (10 * HZ) /* 10s */

#define I915_ENGINE_DEAD_TIMEOUT  (4 * HZ)  /* Seqno, head and subunits dead */
#define I915_SEQNO_DEAD_TIMEOUT   (12 * HZ) /* Seqno dead with active head */

struct i915_gpu_error {
        /* For hangcheck timer */
#define DRM_I915_HANGCHECK_PERIOD 1500 /* in ms */
#define DRM_I915_HANGCHECK_JIFFIES msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD)

        struct delayed_work hangcheck_work;

        /* For reset and error_state handling. */
        spinlock_t lock;
        /* Protected by the above dev->gpu_error.lock. */
        struct i915_gpu_state *first_error;

        atomic_t pending_fb_pin;

        unsigned long missed_irq_rings;

        /**
         * State variable controlling the reset flow and count
         *
         * This is a counter which gets incremented when reset is triggered,
         *
         * Before the reset commences, the I915_RESET_BACKOFF bit is set
         * meaning that any waiters holding onto the struct_mutex should
         * relinquish the lock immediately in order for the reset to start.
         *
         * If reset is not completed succesfully, the I915_WEDGE bit is
         * set meaning that hardware is terminally sour and there is no
         * recovery. All waiters on the reset_queue will be woken when
         * that happens.
         *
         * This counter is used by the wait_seqno code to notice that reset
         * event happened and it needs to restart the entire ioctl (since most
         * likely the seqno it waited for won't ever signal anytime soon).
         *
         * This is important for lock-free wait paths, where no contended lock
         * naturally enforces the correct ordering between the bail-out of the
         * waiter and the gpu reset work code.
         */
        unsigned long reset_count;

        /**
         * flags: Control various stages of the GPU reset
         *
         * #I915_RESET_BACKOFF - When we start a reset, we want to stop any
         * other users acquiring the struct_mutex. To do this we set the
         * #I915_RESET_BACKOFF bit in the error flags when we detect a reset
         * and then check for that bit before acquiring the struct_mutex (in
         * i915_mutex_lock_interruptible()?). I915_RESET_BACKOFF serves a
         * secondary role in preventing two concurrent global reset attempts.
         *
         * #I915_RESET_HANDOFF - To perform the actual GPU reset, we need the
         * struct_mutex. We try to acquire the struct_mutex in the reset worker,
         * but it may be held by some long running waiter (that we cannot
         * interrupt without causing trouble). Once we are ready to do the GPU
         * reset, we set the I915_RESET_HANDOFF bit and wakeup any waiters. If
         * they already hold the struct_mutex and want to participate they can
         * inspect the bit and do the reset directly, otherwise the worker
         * waits for the struct_mutex.
         *
         * #I915_RESET_ENGINE[num_engines] - Since the driver doesn't need to
         * acquire the struct_mutex to reset an engine, we need an explicit
         * flag to prevent two concurrent reset attempts in the same engine.
         * As the number of engines continues to grow, allocate the flags from
         * the most significant bits.
         *
         * #I915_WEDGED - If reset fails and we can no longer use the GPU,
         * we set the #I915_WEDGED bit. Prior to command submission, e.g.
         * i915_gem_request_alloc(), this bit is checked and the sequence
         * aborted (with -EIO reported to userspace) if set.
         */
        unsigned long flags;
#define I915_RESET_BACKOFF      0
#define I915_RESET_HANDOFF      1
#define I915_RESET_MODESET      2
#define I915_WEDGED             (BITS_PER_LONG - 1)
#define I915_RESET_ENGINE       (I915_WEDGED - I915_NUM_ENGINES)

        /** Number of times an engine has been reset */
        u32 reset_engine_count[I915_NUM_ENGINES];

        /**
         * Waitqueue to signal when a hang is detected. Used to for waiters
         * to release the struct_mutex for the reset to procede.
         */
        wait_queue_head_t wait_queue;

        /**
         * Waitqueue to signal when the reset has completed. Used by clients
         * that wait for dev_priv->mm.wedged to settle.
         */
        wait_queue_head_t reset_queue;

        /* For missed irq/seqno simulation. */
        unsigned long test_irq_rings;
};

enum modeset_restore {
        MODESET_ON_LID_OPEN,
        MODESET_DONE,
        MODESET_SUSPENDED,
};

#define DP_AUX_A 0x40
#define DP_AUX_B 0x10
#define DP_AUX_C 0x20
#define DP_AUX_D 0x30

#define DDC_PIN_B  0x05
#define DDC_PIN_C  0x04
#define DDC_PIN_D  0x06

struct ddi_vbt_port_info {
        int max_tmds_clock;

        /*
         * This is an index in the HDMI/DVI DDI buffer translation table.
         * The special value HDMI_LEVEL_SHIFT_UNKNOWN means the VBT didn't
         * populate this field.
         */
#define HDMI_LEVEL_SHIFT_UNKNOWN        0xff
        uint8_t hdmi_level_shift;

        uint8_t supports_dvi:1;
        uint8_t supports_hdmi:1;
        uint8_t supports_dp:1;
        uint8_t supports_edp:1;

        uint8_t alternate_aux_channel;
        uint8_t alternate_ddc_pin;

        uint8_t dp_boost_level;
        uint8_t hdmi_boost_level;
};

enum psr_lines_to_wait {
        PSR_0_LINES_TO_WAIT = 0,
        PSR_1_LINE_TO_WAIT,
        PSR_4_LINES_TO_WAIT,
        PSR_8_LINES_TO_WAIT
};

struct intel_vbt_data {
        struct drm_display_mode *lfp_lvds_vbt_mode; /* if any */
        struct drm_display_mode *sdvo_lvds_vbt_mode; /* if any */

        /* Feature bits */
        unsigned int int_tv_support:1;
        unsigned int lvds_dither:1;
        unsigned int lvds_vbt:1;
        unsigned int int_crt_support:1;
        unsigned int lvds_use_ssc:1;
        unsigned int display_clock_mode:1;
        unsigned int fdi_rx_polarity_inverted:1;
        unsigned int panel_type:4;
        int lvds_ssc_freq;
        unsigned int bios_lvds_val; /* initial [PCH_]LVDS reg val in VBIOS */

        enum drrs_support_type drrs_type;

        struct {
                int rate;
                int lanes;
                int preemphasis;
                int vswing;
                bool low_vswing;
                bool initialized;
                bool support;
                int bpp;
                struct edp_power_seq pps;
        } edp;

        struct {
                bool full_link;
                bool require_aux_wakeup;
                int idle_frames;
                enum psr_lines_to_wait lines_to_wait;
                int tp1_wakeup_time;
                int tp2_tp3_wakeup_time;
        } psr;

        struct {
                u16 pwm_freq_hz;
                bool present;
                bool active_low_pwm;
                u8 min_brightness;      /* min_brightness/255 of max */
                u8 controller;          /* brightness controller number */
                enum intel_backlight_type type;
        } backlight;

        /* MIPI DSI */
        struct {
                u16 panel_id;
                struct mipi_config *config;
                struct mipi_pps_data *pps;
                u16 bl_ports;
                u16 cabc_ports;
                u8 seq_version;
                u32 size;
                u8 *data;
                const u8 *sequence[MIPI_SEQ_MAX];
                u8 *deassert_seq; /* Used by fixup_mipi_sequences() */
        } dsi;

        int crt_ddc_pin;

        int child_dev_num;
        struct child_device_config *child_dev;

        struct ddi_vbt_port_info ddi_port_info[I915_MAX_PORTS];
        struct sdvo_device_mapping sdvo_mappings[2];
};

enum intel_ddb_partitioning {
        INTEL_DDB_PART_1_2,
        INTEL_DDB_PART_5_6, /* IVB+ */
};

struct intel_wm_level {
        bool enable;
        uint32_t pri_val;
        uint32_t spr_val;
        uint32_t cur_val;
        uint32_t fbc_val;
};

struct ilk_wm_values {
        uint32_t wm_pipe[3];
        uint32_t wm_lp[3];
        uint32_t wm_lp_spr[3];
        uint32_t wm_linetime[3];
        bool enable_fbc_wm;
        enum intel_ddb_partitioning partitioning;
};

struct g4x_pipe_wm {
        uint16_t plane[I915_MAX_PLANES];
        uint16_t fbc;
};

struct g4x_sr_wm {
        uint16_t plane;
        uint16_t cursor;
        uint16_t fbc;
};

struct vlv_wm_ddl_values {
        uint8_t plane[I915_MAX_PLANES];
};

struct vlv_wm_values {
        struct g4x_pipe_wm pipe[3];
        struct g4x_sr_wm sr;
        struct vlv_wm_ddl_values ddl[3];
        uint8_t level;
        bool cxsr;
};

struct g4x_wm_values {
        struct g4x_pipe_wm pipe[2];
        struct g4x_sr_wm sr;
        struct g4x_sr_wm hpll;
        bool cxsr;
        bool hpll_en;
        bool fbc_en;
};

struct skl_ddb_entry {
        uint16_t start, end;    /* in number of blocks, 'end' is exclusive */
};

static inline uint16_t skl_ddb_entry_size(const struct skl_ddb_entry *entry)
{
        return entry->end - entry->start;
}

static inline bool skl_ddb_entry_equal(const struct skl_ddb_entry *e1,
                                       const struct skl_ddb_entry *e2)
{
        if (e1->start == e2->start && e1->end == e2->end)
                return true;

        return false;
}

struct skl_ddb_allocation {
        struct skl_ddb_entry plane[I915_MAX_PIPES][I915_MAX_PLANES]; /* packed/uv */
        struct skl_ddb_entry y_plane[I915_MAX_PIPES][I915_MAX_PLANES];
};

struct skl_wm_values {
        unsigned dirty_pipes;
        struct skl_ddb_allocation ddb;
};

struct skl_wm_level {
        bool plane_en;
        uint16_t plane_res_b;
        uint8_t plane_res_l;
};

/* Stores plane specific WM parameters */
struct skl_wm_params {
        bool x_tiled, y_tiled;
        bool rc_surface;
        uint32_t width;
        uint8_t cpp;
        uint32_t plane_pixel_rate;
        uint32_t y_min_scanlines;
        uint32_t plane_bytes_per_line;
        uint_fixed_16_16_t plane_blocks_per_line;
        uint_fixed_16_16_t y_tile_minimum;
        uint32_t linetime_us;
};

/*
 * This struct helps tracking the state needed for runtime PM, which puts the
 * device in PCI D3 state. Notice that when this happens, nothing on the
 * graphics device works, even register access, so we don't get interrupts nor
 * anything else.
 *
 * Every piece of our code that needs to actually touch the hardware needs to
 * either call intel_runtime_pm_get or call intel_display_power_get with the
 * appropriate power domain.
 *
 * Our driver uses the autosuspend delay feature, which means we'll only really
 * suspend if we stay with zero refcount for a certain amount of time. The
 * default value is currently very conservative (see intel_runtime_pm_enable), but
 * it can be changed with the standard runtime PM files from sysfs.
 *
 * The irqs_disabled variable becomes true exactly after we disable the IRQs and
 * goes back to false exactly before we reenable the IRQs. We use this variable
 * to check if someone is trying to enable/disable IRQs while they're supposed
 * to be disabled. This shouldn't happen and we'll print some error messages in
 * case it happens.
 *
 * For more, read the Documentation/power/runtime_pm.txt.
 */
struct i915_runtime_pm {
        atomic_t wakeref_count;
        bool suspended;
        bool irqs_enabled;
};

enum intel_pipe_crc_source {
        INTEL_PIPE_CRC_SOURCE_NONE,
        INTEL_PIPE_CRC_SOURCE_PLANE1,
        INTEL_PIPE_CRC_SOURCE_PLANE2,
        INTEL_PIPE_CRC_SOURCE_PF,
        INTEL_PIPE_CRC_SOURCE_PIPE,
        /* TV/DP on pre-gen5/vlv can't use the pipe source. */
        INTEL_PIPE_CRC_SOURCE_TV,
        INTEL_PIPE_CRC_SOURCE_DP_B,
        INTEL_PIPE_CRC_SOURCE_DP_C,
        INTEL_PIPE_CRC_SOURCE_DP_D,
        INTEL_PIPE_CRC_SOURCE_AUTO,
        INTEL_PIPE_CRC_SOURCE_MAX,
};

struct intel_pipe_crc_entry {
        uint32_t frame;
        uint32_t crc[5];
};

#define INTEL_PIPE_CRC_ENTRIES_NR       128
struct intel_pipe_crc {
        spinlock_t lock;
        bool opened;            /* exclusive access to the result file */
        struct intel_pipe_crc_entry *entries;
        enum intel_pipe_crc_source source;
        int head, tail;
        wait_queue_head_t wq;
        int skipped;
};

struct i915_frontbuffer_tracking {
        spinlock_t lock;

        /*
         * Tracking bits for delayed frontbuffer flushing du to gpu activity or
         * scheduled flips.
         */
        unsigned busy_bits;
        unsigned flip_bits;
};

struct i915_wa_reg {
        i915_reg_t addr;
        u32 value;
        /* bitmask representing WA bits */
        u32 mask;
};

#define I915_MAX_WA_REGS 16

struct i915_workarounds {
        struct i915_wa_reg reg[I915_MAX_WA_REGS];
        u32 count;
        u32 hw_whitelist_count[I915_NUM_ENGINES];
};

struct i915_virtual_gpu {
        bool active;
        u32 caps;
};

/* used in computing the new watermarks state */
struct intel_wm_config {
        unsigned int num_pipes_active;
        bool sprites_enabled;
        bool sprites_scaled;
};

struct i915_oa_format {
        u32 format;
        int size;
};

struct i915_oa_reg {
        i915_reg_t addr;
        u32 value;
};

struct i915_oa_config {
        char uuid[UUID_STRING_LEN + 1];
        int id;

        const struct i915_oa_reg *mux_regs;
        u32 mux_regs_len;
        const struct i915_oa_reg *b_counter_regs;
        u32 b_counter_regs_len;
        const struct i915_oa_reg *flex_regs;
        u32 flex_regs_len;

        struct attribute_group sysfs_metric;
        struct attribute *attrs[2];
        struct device_attribute sysfs_metric_id;

        atomic_t ref_count;
};

struct i915_perf_stream;

/**
 * struct i915_perf_stream_ops - the OPs to support a specific stream type
 */
struct i915_perf_stream_ops {
        /**
         * @enable: Enables the collection of HW samples, either in response to
         * `I915_PERF_IOCTL_ENABLE` or implicitly called when stream is opened
         * without `I915_PERF_FLAG_DISABLED`.
         */
        void (*enable)(struct i915_perf_stream *stream);

        /**
         * @disable: Disables the collection of HW samples, either in response
         * to `I915_PERF_IOCTL_DISABLE` or implicitly called before destroying
         * the stream.
         */
        void (*disable)(struct i915_perf_stream *stream);

        /**
         * @poll_wait: Call poll_wait, passing a wait queue that will be woken
         * once there is something ready to read() for the stream
         */
        void (*poll_wait)(struct i915_perf_stream *stream,
                          struct file *file,
                          poll_table *wait);

        /**
         * @wait_unlocked: For handling a blocking read, wait until there is
         * something to ready to read() for the stream. E.g. wait on the same
         * wait queue that would be passed to poll_wait().
         */
        int (*wait_unlocked)(struct i915_perf_stream *stream);

        /**
         * @read: Copy buffered metrics as records to userspace
         * **buf**: the userspace, destination buffer
         * **count**: the number of bytes to copy, requested by userspace
         * **offset**: zero at the start of the read, updated as the read
         * proceeds, it represents how many bytes have been copied so far and
         * the buffer offset for copying the next record.
         *
         * Copy as many buffered i915 perf samples and records for this stream
         * to userspace as will fit in the given buffer.
         *
         * Only write complete records; returning -%ENOSPC if there isn't room
         * for a complete record.
         *
         * Return any error condition that results in a short read such as
         * -%ENOSPC or -%EFAULT, even though these may be squashed before
         * returning to userspace.
         */
        int (*read)(struct i915_perf_stream *stream,
                    char __user *buf,
                    size_t count,
                    size_t *offset);

        /**
         * @destroy: Cleanup any stream specific resources.
         *
         * The stream will always be disabled before this is called.
         */
        void (*destroy)(struct i915_perf_stream *stream);
};

/**
 * struct i915_perf_stream - state for a single open stream FD
 */
struct i915_perf_stream {
        /**
         * @dev_priv: i915 drm device
         */
        struct drm_i915_private *dev_priv;

        /**
         * @link: Links the stream into ``&drm_i915_private->streams``
         */
        struct list_head link;

        /**
         * @sample_flags: Flags representing the `DRM_I915_PERF_PROP_SAMPLE_*`
         * properties given when opening a stream, representing the contents
         * of a single sample as read() by userspace.
         */
        u32 sample_flags;

        /**
         * @sample_size: Considering the configured contents of a sample
         * combined with the required header size, this is the total size
         * of a single sample record.
         */
        int sample_size;

        /**
         * @ctx: %NULL if measuring system-wide across all contexts or a
         * specific context that is being monitored.
         */
        struct i915_gem_context *ctx;

        /**
         * @enabled: Whether the stream is currently enabled, considering
         * whether the stream was opened in a disabled state and based
         * on `I915_PERF_IOCTL_ENABLE` and `I915_PERF_IOCTL_DISABLE` calls.
         */
        bool enabled;

        /**
         * @ops: The callbacks providing the implementation of this specific
         * type of configured stream.
         */
        const struct i915_perf_stream_ops *ops;

        /**
         * @oa_config: The OA configuration used by the stream.
         */
        struct i915_oa_config *oa_config;
};

/**
 * struct i915_oa_ops - Gen specific implementation of an OA unit stream
 */
struct i915_oa_ops {
        /**
         * @is_valid_b_counter_reg: Validates register's address for
         * programming boolean counters for a particular platform.
         */
        bool (*is_valid_b_counter_reg)(struct drm_i915_private *dev_priv,
                                       u32 addr);

        /**
         * @is_valid_mux_reg: Validates register's address for programming mux
         * for a particular platform.
         */
        bool (*is_valid_mux_reg)(struct drm_i915_private *dev_priv, u32 addr);

        /**
         * @is_valid_flex_reg: Validates register's address for programming
         * flex EU filtering for a particular platform.
         */
        bool (*is_valid_flex_reg)(struct drm_i915_private *dev_priv, u32 addr);

        /**
         * @init_oa_buffer: Resets the head and tail pointers of the
         * circular buffer for periodic OA reports.
         *
         * Called when first opening a stream for OA metrics, but also may be
         * called in response to an OA buffer overflow or other error
         * condition.
         *
         * Note it may be necessary to clear the full OA buffer here as part of
         * maintaining the invariable that new reports must be written to
         * zeroed memory for us to be able to reliable detect if an expected
         * report has not yet landed in memory.  (At least on Haswell the OA
         * buffer tail pointer is not synchronized with reports being visible
         * to the CPU)
         */
        void (*init_oa_buffer)(struct drm_i915_private *dev_priv);

        /**
         * @enable_metric_set: Selects and applies any MUX configuration to set
         * up the Boolean and Custom (B/C) counters that are part of the
         * counter reports being sampled. May apply system constraints such as
         * disabling EU clock gating as required.
         */
        int (*enable_metric_set)(struct drm_i915_private *dev_priv,
                                 const struct i915_oa_config *oa_config);

        /**
         * @disable_metric_set: Remove system constraints associated with using
         * the OA unit.
         */
        void (*disable_metric_set)(struct drm_i915_private *dev_priv);

        /**
         * @oa_enable: Enable periodic sampling
         */
        void (*oa_enable)(struct drm_i915_private *dev_priv);

        /**
         * @oa_disable: Disable periodic sampling
         */
        void (*oa_disable)(struct drm_i915_private *dev_priv);

        /**
         * @read: Copy data from the circular OA buffer into a given userspace
         * buffer.
         */
        int (*read)(struct i915_perf_stream *stream,
                    char __user *buf,
                    size_t count,
                    size_t *offset);

        /**
         * @oa_hw_tail_read: read the OA tail pointer register
         *
         * In particular this enables us to share all the fiddly code for
         * handling the OA unit tail pointer race that affects multiple
         * generations.
         */
        u32 (*oa_hw_tail_read)(struct drm_i915_private *dev_priv);
};

struct intel_cdclk_state {
        unsigned int cdclk, vco, ref;
        u8 voltage_level;
};

struct drm_i915_private {
        struct drm_device drm;

        struct kmem_cache *objects;
        struct kmem_cache *vmas;
        struct kmem_cache *luts;
        struct kmem_cache *requests;
        struct kmem_cache *dependencies;
        struct kmem_cache *priorities;

        const struct intel_device_info info;

        /**
         * Data Stolen Memory - aka "i915 stolen memory" gives us the start and
         * end of stolen which we can optionally use to create GEM objects
         * backed by stolen memory. Note that stolen_usable_size tells us
         * exactly how much of this we are actually allowed to use, given that
         * some portion of it is in fact reserved for use by hardware functions.
         */
        struct resource dsm;
        /**
         * Reseved portion of Data Stolen Memory
         */
        struct resource dsm_reserved;

        /*
         * Stolen memory is segmented in hardware with different portions
         * offlimits to certain functions.
         *
         * The drm_mm is initialised to the total accessible range, as found
         * from the PCI config. On Broadwell+, this is further restricted to
         * avoid the first page! The upper end of stolen memory is reserved for
         * hardware functions and similarly removed from the accessible range.
         */
        resource_size_t stolen_usable_size;     /* Total size minus reserved ranges */

        void __iomem *regs;

        struct intel_uncore uncore;

        struct i915_virtual_gpu vgpu;

        struct intel_gvt *gvt;

        struct intel_huc huc;
        struct intel_guc guc;

        struct intel_csr csr;

        struct intel_gmbus gmbus[GMBUS_NUM_PINS];

        /** gmbus_mutex protects against concurrent usage of the single hw gmbus
         * controller on different i2c buses. */
        struct mutex gmbus_mutex;

        /**
         * Base address of the gmbus and gpio block.
         */
        uint32_t gpio_mmio_base;

        /* MMIO base address for MIPI regs */
        uint32_t mipi_mmio_base;

        uint32_t psr_mmio_base;

        uint32_t pps_mmio_base;

        wait_queue_head_t gmbus_wait_queue;

        struct pci_dev *bridge_dev;
        struct intel_engine_cs *engine[I915_NUM_ENGINES];
        /* Context used internally to idle the GPU and setup initial state */
        struct i915_gem_context *kernel_context;
        /* Context only to be used for injecting preemption commands */
        struct i915_gem_context *preempt_context;
        struct intel_engine_cs *engine_class[MAX_ENGINE_CLASS + 1]
                                            [MAX_ENGINE_INSTANCE + 1];

        struct drm_dma_handle *status_page_dmah;
        struct resource mch_res;

        /* protects the irq masks */
        spinlock_t irq_lock;

        bool display_irqs_enabled;

        /* To control wakeup latency, e.g. for irq-driven dp aux transfers. */
        struct pm_qos_request pm_qos;

        /* Sideband mailbox protection */
        struct mutex sb_lock;

        /** Cached value of IMR to avoid reads in updating the bitfield */
        union {
                u32 irq_mask;
                u32 de_irq_mask[I915_MAX_PIPES];
        };
        u32 gt_irq_mask;
        u32 pm_imr;
        u32 pm_ier;
        u32 pm_rps_events;
        u32 pm_guc_events;
        u32 pipestat_irq_mask[I915_MAX_PIPES];

        struct i915_hotplug hotplug;
        struct intel_fbc fbc;
        struct i915_drrs drrs;
        struct intel_opregion opregion;
        struct intel_vbt_data vbt;

        bool preserve_bios_swizzle;

        /* overlay */
        struct intel_overlay *overlay;

        /* backlight registers and fields in struct intel_panel */
        struct mutex backlight_lock;

        /* LVDS info */
        bool no_aux_handshake;

        /* protects panel power sequencer state */
        struct mutex pps_mutex;

        struct drm_i915_fence_reg fence_regs[I915_MAX_NUM_FENCES]; /* assume 965 */
        int num_fence_regs; /* 8 on pre-965, 16 otherwise */

        unsigned int fsb_freq, mem_freq, is_ddr3;
        unsigned int skl_preferred_vco_freq;
        unsigned int max_cdclk_freq;

        unsigned int max_dotclk_freq;
        unsigned int rawclk_freq;
        unsigned int hpll_freq;
        unsigned int fdi_pll_freq;
        unsigned int czclk_freq;

        struct {
                /*
                 * The current logical cdclk state.
                 * See intel_atomic_state.cdclk.logical
                 *
                 * For reading holding any crtc lock is sufficient,
                 * for writing must hold all of them.
                 */
                struct intel_cdclk_state logical;
                /*
                 * The current actual cdclk state.
                 * See intel_atomic_state.cdclk.actual
                 */
                struct intel_cdclk_state actual;
                /* The current hardware cdclk state */
                struct intel_cdclk_state hw;
        } cdclk;

        /**
         * wq - Driver workqueue for GEM.
         *
         * NOTE: Work items scheduled here are not allowed to grab any modeset
         * locks, for otherwise the flushing done in the pageflip code will
         * result in deadlocks.
         */
        struct workqueue_struct *wq;

        /* ordered wq for modesets */
        struct workqueue_struct *modeset_wq;

        /* Display functions */
        struct drm_i915_display_funcs display;

        /* PCH chipset type */
        enum intel_pch pch_type;
        unsigned short pch_id;

        unsigned long quirks;

        enum modeset_restore modeset_restore;
        struct mutex modeset_restore_lock;
        struct drm_atomic_state *modeset_restore_state;
        struct drm_modeset_acquire_ctx reset_ctx;

        struct list_head vm_list; /* Global list of all address spaces */
        struct i915_ggtt ggtt; /* VM representing the global address space */

        struct i915_gem_mm mm;
        DECLARE_HASHTABLE(mm_structs, 7);
        struct mutex mm_lock;

        struct intel_ppat ppat;

        /* Kernel Modesetting */

        struct intel_crtc *plane_to_crtc_mapping[I915_MAX_PIPES];
        struct intel_crtc *pipe_to_crtc_mapping[I915_MAX_PIPES];

#ifdef CONFIG_DEBUG_FS
        struct intel_pipe_crc pipe_crc[I915_MAX_PIPES];
#endif

        /* dpll and cdclk state is protected by connection_mutex */
        int num_shared_dpll;
        struct intel_shared_dpll shared_dplls[I915_NUM_PLLS];
        const struct intel_dpll_mgr *dpll_mgr;

        /*
         * dpll_lock serializes intel_{prepare,enable,disable}_shared_dpll.
         * Must be global rather than per dpll, because on some platforms
         * plls share registers.
         */
        struct mutex dpll_lock;

        unsigned int active_crtcs;
        /* minimum acceptable cdclk for each pipe */
        int min_cdclk[I915_MAX_PIPES];
        /* minimum acceptable voltage level for each pipe */
        u8 min_voltage_level[I915_MAX_PIPES];

        int dpio_phy_iosf_port[I915_NUM_PHYS_VLV];

        struct i915_workarounds workarounds;

        struct i915_frontbuffer_tracking fb_tracking;

        struct intel_atomic_helper {
                struct llist_head free_list;
                struct work_struct free_work;
        } atomic_helper;

        u16 orig_clock;

        bool mchbar_need_disable;

        struct intel_l3_parity l3_parity;

        /* Cannot be determined by PCIID. You must always read a register. */
        u32 edram_cap;

        /*
         * Protects RPS/RC6 register access and PCU communication.
         * Must be taken after struct_mutex if nested. Note that
         * this lock may be held for long periods of time when
         * talking to hw - so only take it when talking to hw!
         */
        struct mutex pcu_lock;

        /* gen6+ GT PM state */
        struct intel_gen6_power_mgmt gt_pm;

        /* ilk-only ips/rps state. Everything in here is protected by the global
         * mchdev_lock in intel_pm.c */
        struct intel_ilk_power_mgmt ips;

        struct i915_power_domains power_domains;

        struct i915_psr psr;

        struct i915_gpu_error gpu_error;

        struct drm_i915_gem_object *vlv_pctx;

        /* list of fbdev register on this device */
        struct intel_fbdev *fbdev;
        struct work_struct fbdev_suspend_work;

        struct drm_property *broadcast_rgb_property;
        struct drm_property *force_audio_property;

        /* hda/i915 audio component */
        struct i915_audio_component *audio_component;
        bool audio_component_registered;
        /**
         * av_mutex - mutex for audio/video sync
         *
         */
        struct mutex av_mutex;

        struct {
                struct list_head list;
                struct llist_head free_list;
                struct work_struct free_work;

                /* The hw wants to have a stable context identifier for the
                 * lifetime of the context (for OA, PASID, faults, etc).
                 * This is limited in execlists to 21 bits.
                 */
                struct ida hw_ida;
#define MAX_CONTEXT_HW_ID (1<<21) /* exclusive */
        } contexts;

        u32 fdi_rx_config;

        /* Shadow for DISPLAY_PHY_CONTROL which can't be safely read */
        u32 chv_phy_control;
        /*
         * Shadows for CHV DPLL_MD regs to keep the state
         * checker somewhat working in the presence hardware
         * crappiness (can't read out DPLL_MD for pipes B & C).
         */
        u32 chv_dpll_md[I915_MAX_PIPES];
        u32 bxt_phy_grc;

        u32 suspend_count;
        bool suspended_to_idle;
        struct i915_suspend_saved_registers regfile;
        struct vlv_s0ix_state vlv_s0ix_state;

        enum {
                I915_SAGV_UNKNOWN = 0,
                I915_SAGV_DISABLED,
                I915_SAGV_ENABLED,
                I915_SAGV_NOT_CONTROLLED
        } sagv_status;

        struct {
                /*
                 * Raw watermark latency values:
                 * in 0.1us units for WM0,
                 * in 0.5us units for WM1+.
                 */
                /* primary */
                uint16_t pri_latency[5];
                /* sprite */
                uint16_t spr_latency[5];
                /* cursor */
                uint16_t cur_latency[5];
                /*
                 * Raw watermark memory latency values
                 * for SKL for all 8 levels
                 * in 1us units.
                 */
                uint16_t skl_latency[8];

                /* current hardware state */
                union {
                        struct ilk_wm_values hw;
                        struct skl_wm_values skl_hw;
                        struct vlv_wm_values vlv;
                        struct g4x_wm_values g4x;
                };

                uint8_t max_level;

                /*
                 * Should be held around atomic WM register writing; also
                 * protects * intel_crtc->wm.active and
                 * cstate->wm.need_postvbl_update.
                 */
                struct mutex wm_mutex;

                /*
                 * Set during HW readout of watermarks/DDB.  Some platforms
                 * need to know when we're still using BIOS-provided values
                 * (which we don't fully trust).
                 */
                bool distrust_bios_wm;
        } wm;

        struct i915_runtime_pm runtime_pm;

        struct {
                bool initialized;

                struct kobject *metrics_kobj;
                struct ctl_table_header *sysctl_header;

                /*
                 * Lock associated with adding/modifying/removing OA configs
                 * in dev_priv->perf.metrics_idr.
                 */
                struct mutex metrics_lock;

                /*
                 * List of dynamic configurations, you need to hold
                 * dev_priv->perf.metrics_lock to access it.
                 */
                struct idr metrics_idr;

                /*
                 * Lock associated with anything below within this structure
                 * except exclusive_stream.
                 */
                struct mutex lock;
                struct list_head streams;

                struct {
                        /*
                         * The stream currently using the OA unit. If accessed
                         * outside a syscall associated to its file
                         * descriptor, you need to hold
                         * dev_priv->drm.struct_mutex.
                         */
                        struct i915_perf_stream *exclusive_stream;

                        u32 specific_ctx_id;

                        struct hrtimer poll_check_timer;
                        wait_queue_head_t poll_wq;
                        bool pollin;

                        /**
                         * For rate limiting any notifications of spurious
                         * invalid OA reports
                         */
                        struct ratelimit_state spurious_report_rs;

                        bool periodic;
                        int period_exponent;

                        struct i915_oa_config test_config;

                        struct {
                                struct i915_vma *vma;
                                u8 *vaddr;
                                u32 last_ctx_id;
                                int format;
                                int format_size;

                                /**
                                 * Locks reads and writes to all head/tail state
                                 *
                                 * Consider: the head and tail pointer state
                                 * needs to be read consistently from a hrtimer
                                 * callback (atomic context) and read() fop
                                 * (user context) with tail pointer updates
                                 * happening in atomic context and head updates
                                 * in user context and the (unlikely)
                                 * possibility of read() errors needing to
                                 * reset all head/tail state.
                                 *
                                 * Note: Contention or performance aren't
                                 * currently a significant concern here
                                 * considering the relatively low frequency of
                                 * hrtimer callbacks (5ms period) and that
                                 * reads typically only happen in response to a
                                 * hrtimer event and likely complete before the
                                 * next callback.
                                 *
                                 * Note: This lock is not held *while* reading
                                 * and copying data to userspace so the value
                                 * of head observed in htrimer callbacks won't
                                 * represent any partial consumption of data.
                                 */
                                spinlock_t ptr_lock;

                                /**
                                 * One 'aging' tail pointer and one 'aged'
                                 * tail pointer ready to used for reading.
                                 *
                                 * Initial values of 0xffffffff are invalid
                                 * and imply that an update is required
                                 * (and should be ignored by an attempted
                                 * read)
                                 */
                                struct {
                                        u32 offset;
                                } tails[2];

                                /**
                                 * Index for the aged tail ready to read()
                                 * data up to.
                                 */
                                unsigned int aged_tail_idx;

                                /**
                                 * A monotonic timestamp for when the current
                                 * aging tail pointer was read; used to
                                 * determine when it is old enough to trust.
                                 */
                                u64 aging_timestamp;

                                /**
                                 * Although we can always read back the head
                                 * pointer register, we prefer to avoid
                                 * trusting the HW state, just to avoid any
                                 * risk that some hardware condition could
                                 * somehow bump the head pointer unpredictably
                                 * and cause us to forward the wrong OA buffer
                                 * data to userspace.
                                 */
                                u32 head;
                        } oa_buffer;

                        u32 gen7_latched_oastatus1;
                        u32 ctx_oactxctrl_offset;
                        u32 ctx_flexeu0_offset;

                        /**
                         * The RPT_ID/reason field for Gen8+ includes a bit
                         * to determine if the CTX ID in the report is valid
                         * but the specific bit differs between Gen 8 and 9
                         */
                        u32 gen8_valid_ctx_bit;

                        struct i915_oa_ops ops;
                        const struct i915_oa_format *oa_formats;
                } oa;
        } perf;

        /* Abstract the submission mechanism (legacy ringbuffer or execlists) away */
        struct {
                void (*resume)(struct drm_i915_private *);
                void (*cleanup_engine)(struct intel_engine_cs *engine);

                struct list_head timelines;
                struct i915_gem_timeline global_timeline;
                u32 active_requests;

                /**
                 * Is the GPU currently considered idle, or busy executing
                 * userspace requests? Whilst idle, we allow runtime power
                 * management to power down the hardware and display clocks.
                 * In order to reduce the effect on performance, there
                 * is a slight delay before we do so.
                 */
                bool awake;

                /**
                 * We leave the user IRQ off as much as possible,
                 * but this means that requests will finish and never
                 * be retired once the system goes idle. Set a timer to
                 * fire periodically while the ring is running. When it
                 * fires, go retire requests.
                 */
                struct delayed_work retire_work;

                /**
                 * When we detect an idle GPU, we want to turn on
                 * powersaving features. So once we see that there
                 * are no more requests outstanding and no more
                 * arrive within a small period of time, we fire
                 * off the idle_work.
                 */
                struct delayed_work idle_work;

                ktime_t last_init_time;
        } gt;

        /* perform PHY state sanity checks? */
        bool chv_phy_assert[2];

        bool ipc_enabled;

        /* Used to save the pipe-to-encoder mapping for audio */
        struct intel_encoder *av_enc_map[I915_MAX_PIPES];

        /* necessary resource sharing with HDMI LPE audio driver. */
        struct {
                struct platform_device *platdev;
                int     irq;
        } lpe_audio;

        struct i915_pmu pmu;

        /*
         * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
         * will be rejected. Instead look for a better place.
         */
};

static inline struct drm_i915_private *to_i915(const struct drm_device *dev)
{
        return container_of(dev, struct drm_i915_private, drm);
}

static inline struct drm_i915_private *kdev_to_i915(struct device *kdev)
{
        return to_i915(dev_get_drvdata(kdev));
}

static inline struct drm_i915_private *guc_to_i915(struct intel_guc *guc)
{
        return container_of(guc, struct drm_i915_private, guc);
}

static inline struct drm_i915_private *huc_to_i915(struct intel_huc *huc)
{
        return container_of(huc, struct drm_i915_private, huc);
}

/* Simple iterator over all initialised engines */
#define for_each_engine(engine__, dev_priv__, id__) \
        for ((id__) = 0; \
             (id__) < I915_NUM_ENGINES; \
             (id__)++) \
                for_each_if ((engine__) = (dev_priv__)->engine[(id__)])

/* Iterator over subset of engines selected by mask */
#define for_each_engine_masked(engine__, dev_priv__, mask__, tmp__) \
        for (tmp__ = mask__ & INTEL_INFO(dev_priv__)->ring_mask;        \
             tmp__ ? (engine__ = (dev_priv__)->engine[__mask_next_bit(tmp__)]), 1 : 0; )

enum hdmi_force_audio {
        HDMI_AUDIO_OFF_DVI = -2,        /* no aux data for HDMI-DVI converter */
        HDMI_AUDIO_OFF,                 /* force turn off HDMI audio */
        HDMI_AUDIO_AUTO,                /* trust EDID */
        HDMI_AUDIO_ON,                  /* force turn on HDMI audio */
};

#define I915_GTT_OFFSET_NONE ((u32)-1)

/*
 * Frontbuffer tracking bits. Set in obj->frontbuffer_bits while a gem bo is
 * considered to be the frontbuffer for the given plane interface-wise. This
 * doesn't mean that the hw necessarily already scans it out, but that any
 * rendering (by the cpu or gpu) will land in the frontbuffer eventually.
 *
 * We have one bit per pipe and per scanout plane type.
 */
#define INTEL_MAX_SPRITE_BITS_PER_PIPE 5
#define INTEL_FRONTBUFFER_BITS_PER_PIPE 8
#define INTEL_FRONTBUFFER_PRIMARY(pipe) \
        (1 << (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)))
#define INTEL_FRONTBUFFER_CURSOR(pipe) \
        (1 << (1 + (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
#define INTEL_FRONTBUFFER_SPRITE(pipe, plane) \
        (1 << (2 + plane + (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
#define INTEL_FRONTBUFFER_OVERLAY(pipe) \
        (1 << (2 + INTEL_MAX_SPRITE_BITS_PER_PIPE + (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
#define INTEL_FRONTBUFFER_ALL_MASK(pipe) \
        (0xff << (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)))

/*
 * Optimised SGL iterator for GEM objects
 */
static __always_inline struct sgt_iter {
        struct scatterlist *sgp;
        union {
                unsigned long pfn;
                dma_addr_t dma;
        };
        unsigned int curr;
        unsigned int max;
} __sgt_iter(struct scatterlist *sgl, bool dma) {
        struct sgt_iter s = { .sgp = sgl };

        if (s.sgp) {
                s.max = s.curr = s.sgp->offset;
                s.max += s.sgp->length;
                if (dma)
                        s.dma = sg_dma_address(s.sgp);
                else
                        s.pfn = page_to_pfn(sg_page(s.sgp));
        }

        return s;
}

static inline struct scatterlist *____sg_next(struct scatterlist *sg)
{
        ++sg;
        if (unlikely(sg_is_chain(sg)))
                sg = sg_chain_ptr(sg);
        return sg;
}

/**
 * __sg_next - return the next scatterlist entry in a list
 * @sg:         The current sg entry
 *
 * Description:
 *   If the entry is the last, return NULL; otherwise, step to the next
 *   element in the array (@sg@+1). If that's a chain pointer, follow it;
 *   otherwise just return the pointer to the current element.
 **/
static inline struct scatterlist *__sg_next(struct scatterlist *sg)
{
#ifdef CONFIG_DEBUG_SG
        BUG_ON(sg->sg_magic != SG_MAGIC);
#endif
        return sg_is_last(sg) ? NULL : ____sg_next(sg);
}

/**
 * for_each_sgt_dma - iterate over the DMA addresses of the given sg_table
 * @__dmap:     DMA address (output)
 * @__iter:     'struct sgt_iter' (iterator state, internal)
 * @__sgt:      sg_table to iterate over (input)
 */
#define for_each_sgt_dma(__dmap, __iter, __sgt)                         \
        for ((__iter) = __sgt_iter((__sgt)->sgl, true);                 \
             ((__dmap) = (__iter).dma + (__iter).curr);                 \
             (((__iter).curr += PAGE_SIZE) >= (__iter).max) ?           \
             (__iter) = __sgt_iter(__sg_next((__iter).sgp), true), 0 : 0)

/**
 * for_each_sgt_page - iterate over the pages of the given sg_table
 * @__pp:       page pointer (output)
 * @__iter:     'struct sgt_iter' (iterator state, internal)
 * @__sgt:      sg_table to iterate over (input)
 */
#define for_each_sgt_page(__pp, __iter, __sgt)                          \
        for ((__iter) = __sgt_iter((__sgt)->sgl, false);                \
             ((__pp) = (__iter).pfn == 0 ? NULL :                       \
              pfn_to_page((__iter).pfn + ((__iter).curr >> PAGE_SHIFT))); \
             (((__iter).curr += PAGE_SIZE) >= (__iter).max) ?           \
             (__iter) = __sgt_iter(__sg_next((__iter).sgp), false), 0 : 0)

static inline unsigned int i915_sg_page_sizes(struct scatterlist *sg)
{
        unsigned int page_sizes;

        page_sizes = 0;
        while (sg) {
                GEM_BUG_ON(sg->offset);
                GEM_BUG_ON(!IS_ALIGNED(sg->length, PAGE_SIZE));
                page_sizes |= sg->length;
                sg = __sg_next(sg);
        }

        return page_sizes;
}

static inline unsigned int i915_sg_segment_size(void)
{
        unsigned int size = swiotlb_max_segment();

        if (size == 0)
                return SCATTERLIST_MAX_SEGMENT;

        size = rounddown(size, PAGE_SIZE);
        /* swiotlb_max_segment_size can return 1 byte when it means one page. */
        if (size < PAGE_SIZE)
                size = PAGE_SIZE;

        return size;
}

static inline const struct intel_device_info *
intel_info(const struct drm_i915_private *dev_priv)
{
        return &dev_priv->info;
}

#define INTEL_INFO(dev_priv)    intel_info((dev_priv))

#define INTEL_GEN(dev_priv)     ((dev_priv)->info.gen)
#define INTEL_DEVID(dev_priv)   ((dev_priv)->info.device_id)

#define REVID_FOREVER           0xff
#define INTEL_REVID(dev_priv)   ((dev_priv)->drm.pdev->revision)

#define GEN_FOREVER (0)

#define INTEL_GEN_MASK(s, e) ( \
        BUILD_BUG_ON_ZERO(!__builtin_constant_p(s)) + \
        BUILD_BUG_ON_ZERO(!__builtin_constant_p(e)) + \
        GENMASK((e) != GEN_FOREVER ? (e) - 1 : BITS_PER_LONG - 1, \
                (s) != GEN_FOREVER ? (s) - 1 : 0) \
)

/*
 * Returns true if Gen is in inclusive range [Start, End].
 *
 * Use GEN_FOREVER for unbound start and or end.
 */
#define IS_GEN(dev_priv, s, e) \
        (!!((dev_priv)->info.gen_mask & INTEL_GEN_MASK((s), (e))))

/*
 * Return true if revision is in range [since,until] inclusive.
 *
 * Use 0 for open-ended since, and REVID_FOREVER for open-ended until.
 */
#define IS_REVID(p, since, until) \
        (INTEL_REVID(p) >= (since) && INTEL_REVID(p) <= (until))

#define IS_PLATFORM(dev_priv, p) ((dev_priv)->info.platform_mask & BIT(p))

#define IS_I830(dev_priv)       IS_PLATFORM(dev_priv, INTEL_I830)
#define IS_I845G(dev_priv)      IS_PLATFORM(dev_priv, INTEL_I845G)
#define IS_I85X(dev_priv)       IS_PLATFORM(dev_priv, INTEL_I85X)
#define IS_I865G(dev_priv)      IS_PLATFORM(dev_priv, INTEL_I865G)
#define IS_I915G(dev_priv)      IS_PLATFORM(dev_priv, INTEL_I915G)
#define IS_I915GM(dev_priv)     IS_PLATFORM(dev_priv, INTEL_I915GM)
#define IS_I945G(dev_priv)      IS_PLATFORM(dev_priv, INTEL_I945G)
#define IS_I945GM(dev_priv)     IS_PLATFORM(dev_priv, INTEL_I945GM)
#define IS_I965G(dev_priv)      IS_PLATFORM(dev_priv, INTEL_I965G)
#define IS_I965GM(dev_priv)     IS_PLATFORM(dev_priv, INTEL_I965GM)
#define IS_G45(dev_priv)        IS_PLATFORM(dev_priv, INTEL_G45)
#define IS_GM45(dev_priv)       IS_PLATFORM(dev_priv, INTEL_GM45)
#define IS_G4X(dev_priv)        (IS_G45(dev_priv) || IS_GM45(dev_priv))
#define IS_PINEVIEW_G(dev_priv) (INTEL_DEVID(dev_priv) == 0xa001)
#define IS_PINEVIEW_M(dev_priv) (INTEL_DEVID(dev_priv) == 0xa011)
#define IS_PINEVIEW(dev_priv)   IS_PLATFORM(dev_priv, INTEL_PINEVIEW)
#define IS_G33(dev_priv)        IS_PLATFORM(dev_priv, INTEL_G33)
#define IS_IRONLAKE_M(dev_priv) (INTEL_DEVID(dev_priv) == 0x0046)
#define IS_IVYBRIDGE(dev_priv)  IS_PLATFORM(dev_priv, INTEL_IVYBRIDGE)
#define IS_IVB_GT1(dev_priv)    (IS_IVYBRIDGE(dev_priv) && \
                                 (dev_priv)->info.gt == 1)
#define IS_VALLEYVIEW(dev_priv) IS_PLATFORM(dev_priv, INTEL_VALLEYVIEW)
#define IS_CHERRYVIEW(dev_priv) IS_PLATFORM(dev_priv, INTEL_CHERRYVIEW)
#define IS_HASWELL(dev_priv)    IS_PLATFORM(dev_priv, INTEL_HASWELL)
#define IS_BROADWELL(dev_priv)  IS_PLATFORM(dev_priv, INTEL_BROADWELL)
#define IS_SKYLAKE(dev_priv)    IS_PLATFORM(dev_priv, INTEL_SKYLAKE)
#define IS_BROXTON(dev_priv)    IS_PLATFORM(dev_priv, INTEL_BROXTON)
#define IS_KABYLAKE(dev_priv)   IS_PLATFORM(dev_priv, INTEL_KABYLAKE)
#define IS_GEMINILAKE(dev_priv) IS_PLATFORM(dev_priv, INTEL_GEMINILAKE)
#define IS_COFFEELAKE(dev_priv) IS_PLATFORM(dev_priv, INTEL_COFFEELAKE)
#define IS_CANNONLAKE(dev_priv) IS_PLATFORM(dev_priv, INTEL_CANNONLAKE)
#define IS_MOBILE(dev_priv)     ((dev_priv)->info.is_mobile)
#define IS_HSW_EARLY_SDV(dev_priv) (IS_HASWELL(dev_priv) && \
                                    (INTEL_DEVID(dev_priv) & 0xFF00) == 0x0C00)
#define IS_BDW_ULT(dev_priv)    (IS_BROADWELL(dev_priv) && \
                                 ((INTEL_DEVID(dev_priv) & 0xf) == 0x6 ||       \
                                 (INTEL_DEVID(dev_priv) & 0xf) == 0xb ||        \
                                 (INTEL_DEVID(dev_priv) & 0xf) == 0xe))
/* ULX machines are also considered ULT. */
#define IS_BDW_ULX(dev_priv)    (IS_BROADWELL(dev_priv) && \
                                 (INTEL_DEVID(dev_priv) & 0xf) == 0xe)
#define IS_BDW_GT3(dev_priv)    (IS_BROADWELL(dev_priv) && \
                                 (dev_priv)->info.gt == 3)
#define IS_HSW_ULT(dev_priv)    (IS_HASWELL(dev_priv) && \
                                 (INTEL_DEVID(dev_priv) & 0xFF00) == 0x0A00)
#define IS_HSW_GT3(dev_priv)    (IS_HASWELL(dev_priv) && \
                                 (dev_priv)->info.gt == 3)
/* ULX machines are also considered ULT. */
#define IS_HSW_ULX(dev_priv)    (INTEL_DEVID(dev_priv) == 0x0A0E || \
                                 INTEL_DEVID(dev_priv) == 0x0A1E)
#define IS_SKL_ULT(dev_priv)    (INTEL_DEVID(dev_priv) == 0x1906 || \
                                 INTEL_DEVID(dev_priv) == 0x1913 || \
                                 INTEL_DEVID(dev_priv) == 0x1916 || \
                                 INTEL_DEVID(dev_priv) == 0x1921 || \
                                 INTEL_DEVID(dev_priv) == 0x1926)
#define IS_SKL_ULX(dev_priv)    (INTEL_DEVID(dev_priv) == 0x190E || \
                                 INTEL_DEVID(dev_priv) == 0x1915 || \
                                 INTEL_DEVID(dev_priv) == 0x191E)
#define IS_KBL_ULT(dev_priv)    (INTEL_DEVID(dev_priv) == 0x5906 || \
                                 INTEL_DEVID(dev_priv) == 0x5913 || \
                                 INTEL_DEVID(dev_priv) == 0x5916 || \
                                 INTEL_DEVID(dev_priv) == 0x5921 || \
                                 INTEL_DEVID(dev_priv) == 0x5926)
#define IS_KBL_ULX(dev_priv)    (INTEL_DEVID(dev_priv) == 0x590E || \
                                 INTEL_DEVID(dev_priv) == 0x5915 || \
                                 INTEL_DEVID(dev_priv) == 0x591E)
#define IS_SKL_GT2(dev_priv)    (IS_SKYLAKE(dev_priv) && \
                                 (dev_priv)->info.gt == 2)
#define IS_SKL_GT3(dev_priv)    (IS_SKYLAKE(dev_priv) && \
                                 (dev_priv)->info.gt == 3)
#define IS_SKL_GT4(dev_priv)    (IS_SKYLAKE(dev_priv) && \
                                 (dev_priv)->info.gt == 4)
#define IS_KBL_GT2(dev_priv)    (IS_KABYLAKE(dev_priv) && \
                                 (dev_priv)->info.gt == 2)
#define IS_KBL_GT3(dev_priv)    (IS_KABYLAKE(dev_priv) && \
                                 (dev_priv)->info.gt == 3)
#define IS_CFL_ULT(dev_priv)    (IS_COFFEELAKE(dev_priv) && \
                                 (INTEL_DEVID(dev_priv) & 0x00F0) == 0x00A0)
#define IS_CFL_GT2(dev_priv)    (IS_COFFEELAKE(dev_priv) && \
                                 (dev_priv)->info.gt == 2)
#define IS_CFL_GT3(dev_priv)    (IS_COFFEELAKE(dev_priv) && \
                                 (dev_priv)->info.gt == 3)

#define IS_ALPHA_SUPPORT(intel_info) ((intel_info)->is_alpha_support)

#define SKL_REVID_A0            0x0
#define SKL_REVID_B0            0x1
#define SKL_REVID_C0            0x2
#define SKL_REVID_D0            0x3
#define SKL_REVID_E0            0x4
#define SKL_REVID_F0            0x5
#define SKL_REVID_G0            0x6
#define SKL_REVID_H0            0x7

#define IS_SKL_REVID(p, since, until) (IS_SKYLAKE(p) && IS_REVID(p, since, until))

#define BXT_REVID_A0            0x0
#define BXT_REVID_A1            0x1
#define BXT_REVID_B0            0x3
#define BXT_REVID_B_LAST        0x8
#define BXT_REVID_C0            0x9

#define IS_BXT_REVID(dev_priv, since, until) \
        (IS_BROXTON(dev_priv) && IS_REVID(dev_priv, since, until))

#define KBL_REVID_A0            0x0
#define KBL_REVID_B0            0x1
#define KBL_REVID_C0            0x2
#define KBL_REVID_D0            0x3
#define KBL_REVID_E0            0x4

#define IS_KBL_REVID(dev_priv, since, until) \
        (IS_KABYLAKE(dev_priv) && IS_REVID(dev_priv, since, until))

#define GLK_REVID_A0            0x0
#define GLK_REVID_A1            0x1

#define IS_GLK_REVID(dev_priv, since, until) \
        (IS_GEMINILAKE(dev_priv) && IS_REVID(dev_priv, since, until))

#define CNL_REVID_A0            0x0
#define CNL_REVID_B0            0x1
#define CNL_REVID_C0            0x2

#define IS_CNL_REVID(p, since, until) \
        (IS_CANNONLAKE(p) && IS_REVID(p, since, until))

/*
 * The genX designation typically refers to the render engine, so render
 * capability related checks should use IS_GEN, while display and other checks
 * have their own (e.g. HAS_PCH_SPLIT for ILK+ display, IS_foo for particular
 * chips, etc.).
 */
#define IS_GEN2(dev_priv)       (!!((dev_priv)->info.gen_mask & BIT(1)))
#define IS_GEN3(dev_priv)       (!!((dev_priv)->info.gen_mask & BIT(2)))
#define IS_GEN4(dev_priv)       (!!((dev_priv)->info.gen_mask & BIT(3)))
#define IS_GEN5(dev_priv)       (!!((dev_priv)->info.gen_mask & BIT(4)))
#define IS_GEN6(dev_priv)       (!!((dev_priv)->info.gen_mask & BIT(5)))
#define IS_GEN7(dev_priv)       (!!((dev_priv)->info.gen_mask & BIT(6)))
#define IS_GEN8(dev_priv)       (!!((dev_priv)->info.gen_mask & BIT(7)))
#define IS_GEN9(dev_priv)       (!!((dev_priv)->info.gen_mask & BIT(8)))
#define IS_GEN10(dev_priv)      (!!((dev_priv)->info.gen_mask & BIT(9)))

#define IS_LP(dev_priv) (INTEL_INFO(dev_priv)->is_lp)
#define IS_GEN9_LP(dev_priv)    (IS_GEN9(dev_priv) && IS_LP(dev_priv))
#define IS_GEN9_BC(dev_priv)    (IS_GEN9(dev_priv) && !IS_LP(dev_priv))

#define ENGINE_MASK(id) BIT(id)
#define RENDER_RING     ENGINE_MASK(RCS)
#define BSD_RING        ENGINE_MASK(VCS)
#define BLT_RING        ENGINE_MASK(BCS)
#define VEBOX_RING      ENGINE_MASK(VECS)
#define BSD2_RING       ENGINE_MASK(VCS2)
#define ALL_ENGINES     (~0)

#define HAS_ENGINE(dev_priv, id) \
        (!!((dev_priv)->info.ring_mask & ENGINE_MASK(id)))

#define HAS_BSD(dev_priv)       HAS_ENGINE(dev_priv, VCS)
#define HAS_BSD2(dev_priv)      HAS_ENGINE(dev_priv, VCS2)
#define HAS_BLT(dev_priv)       HAS_ENGINE(dev_priv, BCS)
#define HAS_VEBOX(dev_priv)     HAS_ENGINE(dev_priv, VECS)

#define HAS_LEGACY_SEMAPHORES(dev_priv) IS_GEN7(dev_priv)

#define HAS_LLC(dev_priv)       ((dev_priv)->info.has_llc)
#define HAS_SNOOP(dev_priv)     ((dev_priv)->info.has_snoop)
#define HAS_EDRAM(dev_priv)     (!!((dev_priv)->edram_cap & EDRAM_ENABLED))
#define HAS_WT(dev_priv)        ((IS_HASWELL(dev_priv) || \
                                 IS_BROADWELL(dev_priv)) && HAS_EDRAM(dev_priv))

#define HWS_NEEDS_PHYSICAL(dev_priv)    ((dev_priv)->info.hws_needs_physical)

#define HAS_LOGICAL_RING_CONTEXTS(dev_priv) \
                ((dev_priv)->info.has_logical_ring_contexts)
#define HAS_LOGICAL_RING_PREEMPTION(dev_priv) \
                ((dev_priv)->info.has_logical_ring_preemption)

#define HAS_EXECLISTS(dev_priv) HAS_LOGICAL_RING_CONTEXTS(dev_priv)

#define USES_PPGTT(dev_priv)            (i915_modparams.enable_ppgtt)
#define USES_FULL_PPGTT(dev_priv)       (i915_modparams.enable_ppgtt >= 2)
#define USES_FULL_48BIT_PPGTT(dev_priv) (i915_modparams.enable_ppgtt == 3)
#define HAS_PAGE_SIZES(dev_priv, sizes) ({ \
        GEM_BUG_ON((sizes) == 0); \
        ((sizes) & ~(dev_priv)->info.page_sizes) == 0; \
})

#define HAS_OVERLAY(dev_priv)            ((dev_priv)->info.has_overlay)
#define OVERLAY_NEEDS_PHYSICAL(dev_priv) \
                ((dev_priv)->info.overlay_needs_physical)

/* Early gen2 have a totally busted CS tlb and require pinned batches. */
#define HAS_BROKEN_CS_TLB(dev_priv)     (IS_I830(dev_priv) || IS_I845G(dev_priv))

/* WaRsDisableCoarsePowerGating:skl,bxt */
#define NEEDS_WaRsDisableCoarsePowerGating(dev_priv) \
        (IS_SKL_GT3(dev_priv) || IS_SKL_GT4(dev_priv))

/*
 * dp aux and gmbus irq on gen4 seems to be able to generate legacy interrupts
 * even when in MSI mode. This results in spurious interrupt warnings if the
 * legacy irq no. is shared with another device. The kernel then disables that
 * interrupt source and so prevents the other device from working properly.
 *
 * Since we don't enable MSI anymore on gen4, we can always use GMBUS/AUX
 * interrupts.
 */
#define HAS_AUX_IRQ(dev_priv)   true
#define HAS_GMBUS_IRQ(dev_priv) (INTEL_GEN(dev_priv) >= 4)

/* With the 945 and later, Y tiling got adjusted so that it was 32 128-byte
 * rows, which changed the alignment requirements and fence programming.
 */
#define HAS_128_BYTE_Y_TILING(dev_priv) (!IS_GEN2(dev_priv) && \
                                         !(IS_I915G(dev_priv) || \
                                         IS_I915GM(dev_priv)))
#define SUPPORTS_TV(dev_priv)           ((dev_priv)->info.supports_tv)
#define I915_HAS_HOTPLUG(dev_priv)      ((dev_priv)->info.has_hotplug)

#define HAS_FW_BLC(dev_priv)    (INTEL_GEN(dev_priv) > 2)
#define HAS_FBC(dev_priv)       ((dev_priv)->info.has_fbc)
#define HAS_CUR_FBC(dev_priv)   (!HAS_GMCH_DISPLAY(dev_priv) && INTEL_INFO(dev_priv)->gen >= 7)

#define HAS_IPS(dev_priv)       (IS_HSW_ULT(dev_priv) || IS_BROADWELL(dev_priv))

#define HAS_DP_MST(dev_priv)    ((dev_priv)->info.has_dp_mst)

#define HAS_DDI(dev_priv)                ((dev_priv)->info.has_ddi)
#define HAS_FPGA_DBG_UNCLAIMED(dev_priv) ((dev_priv)->info.has_fpga_dbg)
#define HAS_PSR(dev_priv)                ((dev_priv)->info.has_psr)

#define HAS_RC6(dev_priv)                ((dev_priv)->info.has_rc6)
#define HAS_RC6p(dev_priv)               ((dev_priv)->info.has_rc6p)
#define HAS_RC6pp(dev_priv)              (false) /* HW was never validated */

#define HAS_CSR(dev_priv)       ((dev_priv)->info.has_csr)

#define HAS_RUNTIME_PM(dev_priv) ((dev_priv)->info.has_runtime_pm)
#define HAS_64BIT_RELOC(dev_priv) ((dev_priv)->info.has_64bit_reloc)

#define HAS_IPC(dev_priv)                ((dev_priv)->info.has_ipc)

/*
 * For now, anything with a GuC requires uCode loading, and then supports
 * command submission once loaded. But these are logically independent
 * properties, so we have separate macros to test them.
 */
#define HAS_GUC(dev_priv)       ((dev_priv)->info.has_guc)
#define HAS_GUC_CT(dev_priv)    ((dev_priv)->info.has_guc_ct)
#define HAS_GUC_UCODE(dev_priv) (HAS_GUC(dev_priv))
#define HAS_GUC_SCHED(dev_priv) (HAS_GUC(dev_priv))

/* For now, anything with a GuC has also HuC */
#define HAS_HUC(dev_priv)       (HAS_GUC(dev_priv))
#define HAS_HUC_UCODE(dev_priv) (HAS_GUC(dev_priv))

/* Having a GuC is not the same as using a GuC */
#define USES_GUC(dev_priv)              intel_uc_is_using_guc()
#define USES_GUC_SUBMISSION(dev_priv)   intel_uc_is_using_guc_submission()
#define USES_HUC(dev_priv)              intel_uc_is_using_huc()

#define HAS_RESOURCE_STREAMER(dev_priv) ((dev_priv)->info.has_resource_streamer)

#define HAS_POOLED_EU(dev_priv) ((dev_priv)->info.has_pooled_eu)

#define INTEL_PCH_DEVICE_ID_MASK                0xff80
#define INTEL_PCH_IBX_DEVICE_ID_TYPE            0x3b00
#define INTEL_PCH_CPT_DEVICE_ID_TYPE            0x1c00
#define INTEL_PCH_PPT_DEVICE_ID_TYPE            0x1e00
#define INTEL_PCH_LPT_DEVICE_ID_TYPE            0x8c00
#define INTEL_PCH_LPT_LP_DEVICE_ID_TYPE         0x9c00
#define INTEL_PCH_WPT_DEVICE_ID_TYPE            0x8c80
#define INTEL_PCH_WPT_LP_DEVICE_ID_TYPE         0x9c80
#define INTEL_PCH_SPT_DEVICE_ID_TYPE            0xA100
#define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE         0x9D00
#define INTEL_PCH_KBP_DEVICE_ID_TYPE            0xA280
#define INTEL_PCH_CNP_DEVICE_ID_TYPE            0xA300
#define INTEL_PCH_CNP_LP_DEVICE_ID_TYPE         0x9D80
#define INTEL_PCH_P2X_DEVICE_ID_TYPE            0x7100
#define INTEL_PCH_P3X_DEVICE_ID_TYPE            0x7000
#define INTEL_PCH_QEMU_DEVICE_ID_TYPE           0x2900 /* qemu q35 has 2918 */

#define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
#define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
#define HAS_PCH_CNP_LP(dev_priv) \
        ((dev_priv)->pch_id == INTEL_PCH_CNP_LP_DEVICE_ID_TYPE)
#define HAS_PCH_KBP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_KBP)
#define HAS_PCH_SPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_SPT)
#define HAS_PCH_LPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_LPT)
#define HAS_PCH_LPT_LP(dev_priv) \
        ((dev_priv)->pch_id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE || \
         (dev_priv)->pch_id == INTEL_PCH_WPT_LP_DEVICE_ID_TYPE)
#define HAS_PCH_LPT_H(dev_priv) \
        ((dev_priv)->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE || \
         (dev_priv)->pch_id == INTEL_PCH_WPT_DEVICE_ID_TYPE)
#define HAS_PCH_CPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CPT)
#define HAS_PCH_IBX(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_IBX)
#define HAS_PCH_NOP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_NOP)
#define HAS_PCH_SPLIT(dev_priv) (INTEL_PCH_TYPE(dev_priv) != PCH_NONE)

#define HAS_GMCH_DISPLAY(dev_priv) ((dev_priv)->info.has_gmch_display)

#define HAS_LSPCON(dev_priv) (INTEL_GEN(dev_priv) >= 9)

/* DPF == dynamic parity feature */
#define HAS_L3_DPF(dev_priv) ((dev_priv)->info.has_l3_dpf)
#define NUM_L3_SLICES(dev_priv) (IS_HSW_GT3(dev_priv) ? \
                                 2 : HAS_L3_DPF(dev_priv))

#define GT_FREQUENCY_MULTIPLIER 50
#define GEN9_FREQ_SCALER 3

#include "i915_trace.h"

static inline bool intel_vtd_active(void)
{
#ifdef CONFIG_INTEL_IOMMU
        if (intel_iommu_gfx_mapped)
                return true;
#endif
        return false;
}

static inline bool intel_scanout_needs_vtd_wa(struct drm_i915_private *dev_priv)
{
        return INTEL_GEN(dev_priv) >= 6 && intel_vtd_active();
}

static inline bool
intel_ggtt_update_needs_vtd_wa(struct drm_i915_private *dev_priv)
{
        return IS_BROXTON(dev_priv) && intel_vtd_active();
}

int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
                                int enable_ppgtt);

/* i915_drv.c */
void __printf(3, 4)
__i915_printk(struct drm_i915_private *dev_priv, const char *level,
              const char *fmt, ...);

#define i915_report_error(dev_priv, fmt, ...)                              \
        __i915_printk(dev_priv, KERN_ERR, fmt, ##__VA_ARGS__)

#ifdef CONFIG_COMPAT
extern long i915_compat_ioctl(struct file *filp, unsigned int cmd,
                              unsigned long arg);
#else
#define i915_compat_ioctl NULL
#endif
extern const struct dev_pm_ops i915_pm_ops;

extern int i915_driver_load(struct pci_dev *pdev,
                            const struct pci_device_id *ent);
extern void i915_driver_unload(struct drm_device *dev);
extern int intel_gpu_reset(struct drm_i915_private *dev_priv, u32 engine_mask);
extern bool intel_has_gpu_reset(struct drm_i915_private *dev_priv);

#define I915_RESET_QUIET BIT(0)
extern void i915_reset(struct drm_i915_private *i915, unsigned int flags);
extern int i915_reset_engine(struct intel_engine_cs *engine,
                             unsigned int flags);

extern bool intel_has_reset_engine(struct drm_i915_private *dev_priv);
extern int intel_reset_guc(struct drm_i915_private *dev_priv);
extern int intel_guc_reset_engine(struct intel_guc *guc,
                                  struct intel_engine_cs *engine);
extern void intel_engine_init_hangcheck(struct intel_engine_cs *engine);
extern void intel_hangcheck_init(struct drm_i915_private *dev_priv);
extern unsigned long i915_chipset_val(struct drm_i915_private *dev_priv);
extern unsigned long i915_mch_val(struct drm_i915_private *dev_priv);
extern unsigned long i915_gfx_val(struct drm_i915_private *dev_priv);
extern void i915_update_gfx_val(struct drm_i915_private *dev_priv);
int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool on);

int intel_engines_init_mmio(struct drm_i915_private *dev_priv);
int intel_engines_init(struct drm_i915_private *dev_priv);

/* intel_hotplug.c */
void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
                           u32 pin_mask, u32 long_mask);
void intel_hpd_init(struct drm_i915_private *dev_priv);
void intel_hpd_init_work(struct drm_i915_private *dev_priv);
void intel_hpd_cancel_work(struct drm_i915_private *dev_priv);
enum port intel_hpd_pin_to_port(enum hpd_pin pin);
enum hpd_pin intel_hpd_pin(enum port port);
bool intel_hpd_disable(struct drm_i915_private *dev_priv, enum hpd_pin pin);
void intel_hpd_enable(struct drm_i915_private *dev_priv, enum hpd_pin pin);

/* i915_irq.c */
static inline void i915_queue_hangcheck(struct drm_i915_private *dev_priv)
{
        unsigned long delay;

        if (unlikely(!i915_modparams.enable_hangcheck))
                return;

        /* Don't continually defer the hangcheck so that it is always run at
         * least once after work has been scheduled on any ring. Otherwise,
         * we will ignore a hung ring if a second ring is kept busy.
         */

        delay = round_jiffies_up_relative(DRM_I915_HANGCHECK_JIFFIES);
        queue_delayed_work(system_long_wq,
                           &dev_priv->gpu_error.hangcheck_work, delay);
}

__printf(3, 4)
void i915_handle_error(struct drm_i915_private *dev_priv,
                       u32 engine_mask,
                       const char *fmt, ...);

extern void intel_irq_init(struct drm_i915_private *dev_priv);
extern void intel_irq_fini(struct drm_i915_private *dev_priv);
int intel_irq_install(struct drm_i915_private *dev_priv);
void intel_irq_uninstall(struct drm_i915_private *dev_priv);

static inline bool intel_gvt_active(struct drm_i915_private *dev_priv)
{
        return dev_priv->gvt;
}

static inline bool intel_vgpu_active(struct drm_i915_private *dev_priv)
{
        return dev_priv->vgpu.active;
}

u32 i915_pipestat_enable_mask(struct drm_i915_private *dev_priv,
                              enum pipe pipe);
void
i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
                     u32 status_mask);

void
i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
                      u32 status_mask);

void valleyview_enable_display_irqs(struct drm_i915_private *dev_priv);
void valleyview_disable_display_irqs(struct drm_i915_private *dev_priv);
void i915_hotplug_interrupt_update(struct drm_i915_private *dev_priv,
                                   uint32_t mask,
                                   uint32_t bits);
void ilk_update_display_irq(struct drm_i915_private *dev_priv,
                            uint32_t interrupt_mask,
                            uint32_t enabled_irq_mask);
static inline void
ilk_enable_display_irq(struct drm_i915_private *dev_priv, uint32_t bits)
{
        ilk_update_display_irq(dev_priv, bits, bits);
}
static inline void
ilk_disable_display_irq(struct drm_i915_private *dev_priv, uint32_t bits)
{
        ilk_update_display_irq(dev_priv, bits, 0);
}
void bdw_update_pipe_irq(struct drm_i915_private *dev_priv,
                         enum pipe pipe,
                         uint32_t interrupt_mask,
                         uint32_t enabled_irq_mask);
static inline void bdw_enable_pipe_irq(struct drm_i915_private *dev_priv,
                                       enum pipe pipe, uint32_t bits)
{
        bdw_update_pipe_irq(dev_priv, pipe, bits, bits);
}
static inline void bdw_disable_pipe_irq(struct drm_i915_private *dev_priv,
                                        enum pipe pipe, uint32_t bits)
{
        bdw_update_pipe_irq(dev_priv, pipe, bits, 0);
}
void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,
                                  uint32_t interrupt_mask,
                                  uint32_t enabled_irq_mask);
static inline void
ibx_enable_display_interrupt(struct drm_i915_private *dev_priv, uint32_t bits)
{
        ibx_display_interrupt_update(dev_priv, bits, bits);
}
static inline void
ibx_disable_display_interrupt(struct drm_i915_private *dev_priv, uint32_t bits)
{
        ibx_display_interrupt_update(dev_priv, bits, 0);
}

/* i915_gem.c */
int i915_gem_create_ioctl(struct drm_device *dev, void *data,
                          struct drm_file *file_priv);
int i915_gem_pread_ioctl(struct drm_device *dev, void *data,
                         struct drm_file *file_priv);
int i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
                          struct drm_file *file_priv);
int i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
int i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
int i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv);
int i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
                             struct drm_file *file_priv);
int i915_gem_execbuffer(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
int i915_gem_execbuffer2(struct drm_device *dev, void *data,
                         struct drm_file *file_priv);
int i915_gem_busy_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
                               struct drm_file *file);
int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
                               struct drm_file *file);
int i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
                            struct drm_file *file_priv);
int i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
                           struct drm_file *file_priv);
int i915_gem_set_tiling_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv);
int i915_gem_get_tiling_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv);
int i915_gem_init_userptr(struct drm_i915_private *dev_priv);
void i915_gem_cleanup_userptr(struct drm_i915_private *dev_priv);
int i915_gem_userptr_ioctl(struct drm_device *dev, void *data,
                           struct drm_file *file);
int i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
                                struct drm_file *file_priv);
int i915_gem_wait_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
void i915_gem_sanitize(struct drm_i915_private *i915);
int i915_gem_load_init(struct drm_i915_private *dev_priv);
void i915_gem_load_cleanup(struct drm_i915_private *dev_priv);
void i915_gem_load_init_fences(struct drm_i915_private *dev_priv);
int i915_gem_freeze(struct drm_i915_private *dev_priv);
int i915_gem_freeze_late(struct drm_i915_private *dev_priv);

void *i915_gem_object_alloc(struct drm_i915_private *dev_priv);
void i915_gem_object_free(struct drm_i915_gem_object *obj);
void i915_gem_object_init(struct drm_i915_gem_object *obj,
                         const struct drm_i915_gem_object_ops *ops);
struct drm_i915_gem_object *
i915_gem_object_create(struct drm_i915_private *dev_priv, u64 size);
struct drm_i915_gem_object *
i915_gem_object_create_from_data(struct drm_i915_private *dev_priv,
                                 const void *data, size_t size);
void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file);
void i915_gem_free_object(struct drm_gem_object *obj);

static inline void i915_gem_drain_freed_objects(struct drm_i915_private *i915)
{
        /* A single pass should suffice to release all the freed objects (along
         * most call paths) , but be a little more paranoid in that freeing
         * the objects does take a little amount of time, during which the rcu
         * callbacks could have added new objects into the freed list, and
         * armed the work again.
         */
        do {
                rcu_barrier();
        } while (flush_work(&i915->mm.free_work));
}

static inline void i915_gem_drain_workqueue(struct drm_i915_private *i915)
{
        /*
         * Similar to objects above (see i915_gem_drain_freed-objects), in
         * general we have workers that are armed by RCU and then rearm
         * themselves in their callbacks. To be paranoid, we need to
         * drain the workqueue a second time after waiting for the RCU
         * grace period so that we catch work queued via RCU from the first
         * pass. As neither drain_workqueue() nor flush_workqueue() report
         * a result, we make an assumption that we only don't require more
         * than 2 passes to catch all recursive RCU delayed work.
         *
         */
        int pass = 2;
        do {
                rcu_barrier();
                drain_workqueue(i915->wq);
        } while (--pass);
}

struct i915_vma * __must_check
i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
                         const struct i915_ggtt_view *view,
                         u64 size,
                         u64 alignment,
                         u64 flags);

int i915_gem_object_unbind(struct drm_i915_gem_object *obj);
void i915_gem_release_mmap(struct drm_i915_gem_object *obj);

void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv);

static inline int __sg_page_count(const struct scatterlist *sg)
{
        return sg->length >> PAGE_SHIFT;
}

struct scatterlist *
i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
                       unsigned int n, unsigned int *offset);

struct page *
i915_gem_object_get_page(struct drm_i915_gem_object *obj,
                         unsigned int n);

struct page *
i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
                               unsigned int n);

dma_addr_t
i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
                                unsigned long n);

void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
                                 struct sg_table *pages,
                                 unsigned int sg_page_sizes);
int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj);

static inline int __must_check
i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
{
        might_lock(&obj->mm.lock);

        if (atomic_inc_not_zero(&obj->mm.pages_pin_count))
                return 0;

        return __i915_gem_object_get_pages(obj);
}

static inline bool
i915_gem_object_has_pages(struct drm_i915_gem_object *obj)
{
        return !IS_ERR_OR_NULL(READ_ONCE(obj->mm.pages));
}

static inline void
__i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
{
        GEM_BUG_ON(!i915_gem_object_has_pages(obj));

        atomic_inc(&obj->mm.pages_pin_count);
}

static inline bool
i915_gem_object_has_pinned_pages(struct drm_i915_gem_object *obj)
{
        return atomic_read(&obj->mm.pages_pin_count);
}

static inline void
__i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
{
        GEM_BUG_ON(!i915_gem_object_has_pages(obj));
        GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));

        atomic_dec(&obj->mm.pages_pin_count);
}

static inline void
i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
{
        __i915_gem_object_unpin_pages(obj);
}

enum i915_mm_subclass { /* lockdep subclass for obj->mm.lock */
        I915_MM_NORMAL = 0,
        I915_MM_SHRINKER
};

void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
                                 enum i915_mm_subclass subclass);
void __i915_gem_object_invalidate(struct drm_i915_gem_object *obj);

enum i915_map_type {
        I915_MAP_WB = 0,
        I915_MAP_WC,
#define I915_MAP_OVERRIDE BIT(31)
        I915_MAP_FORCE_WB = I915_MAP_WB | I915_MAP_OVERRIDE,
        I915_MAP_FORCE_WC = I915_MAP_WC | I915_MAP_OVERRIDE,
};

/**
 * i915_gem_object_pin_map - return a contiguous mapping of the entire object
 * @obj: the object to map into kernel address space
 * @type: the type of mapping, used to select pgprot_t
 *
 * Calls i915_gem_object_pin_pages() to prevent reaping of the object's
 * pages and then returns a contiguous mapping of the backing storage into
 * the kernel address space. Based on the @type of mapping, the PTE will be
 * set to either WriteBack or WriteCombine (via pgprot_t).
 *
 * The caller is responsible for calling i915_gem_object_unpin_map() when the
 * mapping is no longer required.
 *
 * Returns the pointer through which to access the mapped object, or an
 * ERR_PTR() on error.
 */
void *__must_check i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
                                           enum i915_map_type type);

/**
 * i915_gem_object_unpin_map - releases an earlier mapping
 * @obj: the object to unmap
 *
 * After pinning the object and mapping its pages, once you are finished
 * with your access, call i915_gem_object_unpin_map() to release the pin
 * upon the mapping. Once the pin count reaches zero, that mapping may be
 * removed.
 */
static inline void i915_gem_object_unpin_map(struct drm_i915_gem_object *obj)
{
        i915_gem_object_unpin_pages(obj);
}

int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
                                    unsigned int *needs_clflush);
int i915_gem_obj_prepare_shmem_write(struct drm_i915_gem_object *obj,
                                     unsigned int *needs_clflush);
#define CLFLUSH_BEFORE  BIT(0)
#define CLFLUSH_AFTER   BIT(1)
#define CLFLUSH_FLAGS   (CLFLUSH_BEFORE | CLFLUSH_AFTER)

static inline void
i915_gem_obj_finish_shmem_access(struct drm_i915_gem_object *obj)
{
        i915_gem_object_unpin_pages(obj);
}

int __must_check i915_mutex_lock_interruptible(struct drm_device *dev);
void i915_vma_move_to_active(struct i915_vma *vma,
                             struct drm_i915_gem_request *req,
                             unsigned int flags);
int i915_gem_dumb_create(struct drm_file *file_priv,
                         struct drm_device *dev,
                         struct drm_mode_create_dumb *args);
int i915_gem_mmap_gtt(struct drm_file *file_priv, struct drm_device *dev,
                      uint32_t handle, uint64_t *offset);
int i915_gem_mmap_gtt_version(void);

void i915_gem_track_fb(struct drm_i915_gem_object *old,
                       struct drm_i915_gem_object *new,
                       unsigned frontbuffer_bits);

int __must_check i915_gem_set_global_seqno(struct drm_device *dev, u32 seqno);

struct drm_i915_gem_request *
i915_gem_find_active_request(struct intel_engine_cs *engine);

void i915_gem_retire_requests(struct drm_i915_private *dev_priv);

static inline bool i915_reset_backoff(struct i915_gpu_error *error)
{
        return unlikely(test_bit(I915_RESET_BACKOFF, &error->flags));
}

static inline bool i915_reset_handoff(struct i915_gpu_error *error)
{
        return unlikely(test_bit(I915_RESET_HANDOFF, &error->flags));
}

static inline bool i915_terminally_wedged(struct i915_gpu_error *error)
{
        return unlikely(test_bit(I915_WEDGED, &error->flags));
}

static inline bool i915_reset_backoff_or_wedged(struct i915_gpu_error *error)
{
        return i915_reset_backoff(error) | i915_terminally_wedged(error);
}

static inline u32 i915_reset_count(struct i915_gpu_error *error)
{
        return READ_ONCE(error->reset_count);
}

static inline u32 i915_reset_engine_count(struct i915_gpu_error *error,
                                          struct intel_engine_cs *engine)
{
        return READ_ONCE(error->reset_engine_count[engine->id]);
}

struct drm_i915_gem_request *
i915_gem_reset_prepare_engine(struct intel_engine_cs *engine);
int i915_gem_reset_prepare(struct drm_i915_private *dev_priv);
void i915_gem_reset(struct drm_i915_private *dev_priv);
void i915_gem_reset_finish_engine(struct intel_engine_cs *engine);
void i915_gem_reset_finish(struct drm_i915_private *dev_priv);
void i915_gem_set_wedged(struct drm_i915_private *dev_priv);
bool i915_gem_unset_wedged(struct drm_i915_private *dev_priv);
void i915_gem_reset_engine(struct intel_engine_cs *engine,
                           struct drm_i915_gem_request *request);

void i915_gem_init_mmio(struct drm_i915_private *i915);
int __must_check i915_gem_init(struct drm_i915_private *dev_priv);
int __must_check i915_gem_init_hw(struct drm_i915_private *dev_priv);
void i915_gem_init_swizzling(struct drm_i915_private *dev_priv);
void i915_gem_cleanup_engines(struct drm_i915_private *dev_priv);
int i915_gem_wait_for_idle(struct drm_i915_private *dev_priv,
                           unsigned int flags);
int __must_check i915_gem_suspend(struct drm_i915_private *dev_priv);
void i915_gem_resume(struct drm_i915_private *dev_priv);
int i915_gem_fault(struct vm_fault *vmf);
int i915_gem_object_wait(struct drm_i915_gem_object *obj,
                         unsigned int flags,
                         long timeout,
                         struct intel_rps_client *rps);
int i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
                                  unsigned int flags,
                                  int priority);
#define I915_PRIORITY_DISPLAY I915_PRIORITY_MAX

int __must_check
i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write);
int __must_check
i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write);
int __must_check
i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write);
struct i915_vma * __must_check
i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
                                     u32 alignment,
                                     const struct i915_ggtt_view *view);
void i915_gem_object_unpin_from_display_plane(struct i915_vma *vma);
int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj,
                                int align);
int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file);
void i915_gem_release(struct drm_device *dev, struct drm_file *file);

int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
                                    enum i915_cache_level cache_level);

struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
                                struct dma_buf *dma_buf);

struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
                                struct drm_gem_object *gem_obj, int flags);

static inline struct i915_hw_ppgtt *
i915_vm_to_ppgtt(struct i915_address_space *vm)
{
        return container_of(vm, struct i915_hw_ppgtt, base);
}

/* i915_gem_fence_reg.c */
struct drm_i915_fence_reg *
i915_reserve_fence(struct drm_i915_private *dev_priv);
void i915_unreserve_fence(struct drm_i915_fence_reg *fence);

void i915_gem_revoke_fences(struct drm_i915_private *dev_priv);
void i915_gem_restore_fences(struct drm_i915_private *dev_priv);

void i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv);
void i915_gem_object_do_bit_17_swizzle(struct drm_i915_gem_object *obj,
                                       struct sg_table *pages);
void i915_gem_object_save_bit_17_swizzle(struct drm_i915_gem_object *obj,
                                         struct sg_table *pages);

static inline struct i915_gem_context *
__i915_gem_context_lookup_rcu(struct drm_i915_file_private *file_priv, u32 id)
{
        return idr_find(&file_priv->context_idr, id);
}

static inline struct i915_gem_context *
i915_gem_context_lookup(struct drm_i915_file_private *file_priv, u32 id)
{
        struct i915_gem_context *ctx;

        rcu_read_lock();
        ctx = __i915_gem_context_lookup_rcu(file_priv, id);
        if (ctx && !kref_get_unless_zero(&ctx->ref))
                ctx = NULL;
        rcu_read_unlock();

        return ctx;
}

static inline struct intel_timeline *
i915_gem_context_lookup_timeline(struct i915_gem_context *ctx,
                                 struct intel_engine_cs *engine)
{
        struct i915_address_space *vm;

        vm = ctx->ppgtt ? &ctx->ppgtt->base : &ctx->i915->ggtt.base;
        return &vm->timeline.engine[engine->id];
}

int i915_perf_open_ioctl(struct drm_device *dev, void *data,
                         struct drm_file *file);
int i915_perf_add_config_ioctl(struct drm_device *dev, void *data,
                               struct drm_file *file);
int i915_perf_remove_config_ioctl(struct drm_device *dev, void *data,
                                  struct drm_file *file);
void i915_oa_init_reg_state(struct intel_engine_cs *engine,
                            struct i915_gem_context *ctx,
                            uint32_t *reg_state);

/* i915_gem_evict.c */
int __must_check i915_gem_evict_something(struct i915_address_space *vm,
                                          u64 min_size, u64 alignment,
                                          unsigned cache_level,
                                          u64 start, u64 end,
                                          unsigned flags);
int __must_check i915_gem_evict_for_node(struct i915_address_space *vm,
                                         struct drm_mm_node *node,
                                         unsigned int flags);
int i915_gem_evict_vm(struct i915_address_space *vm);

void i915_gem_flush_ggtt_writes(struct drm_i915_private *dev_priv);

/* belongs in i915_gem_gtt.h */
static inline void i915_gem_chipset_flush(struct drm_i915_private *dev_priv)
{
        wmb();
        if (INTEL_GEN(dev_priv) < 6)
                intel_gtt_chipset_flush();
}

/* i915_gem_stolen.c */
int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
                                struct drm_mm_node *node, u64 size,
                                unsigned alignment);
int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
                                         struct drm_mm_node *node, u64 size,
                                         unsigned alignment, u64 start,
                                         u64 end);
void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
                                 struct drm_mm_node *node);
int i915_gem_init_stolen(struct drm_i915_private *dev_priv);
void i915_gem_cleanup_stolen(struct drm_device *dev);
struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
                              resource_size_t size);
struct drm_i915_gem_object *
i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
                                               resource_size_t stolen_offset,
                                               resource_size_t gtt_offset,
                                               resource_size_t size);

/* i915_gem_internal.c */
struct drm_i915_gem_object *
i915_gem_object_create_internal(struct drm_i915_private *dev_priv,
                                phys_addr_t size);

/* i915_gem_shrinker.c */
unsigned long i915_gem_shrink(struct drm_i915_private *i915,
                              unsigned long target,
                              unsigned long *nr_scanned,
                              unsigned flags);
#define I915_SHRINK_PURGEABLE 0x1
#define I915_SHRINK_UNBOUND 0x2
#define I915_SHRINK_BOUND 0x4
#define I915_SHRINK_ACTIVE 0x8
#define I915_SHRINK_VMAPS 0x10
unsigned long i915_gem_shrink_all(struct drm_i915_private *i915);
void i915_gem_shrinker_register(struct drm_i915_private *i915);
void i915_gem_shrinker_unregister(struct drm_i915_private *i915);


/* i915_gem_tiling.c */
static inline bool i915_gem_object_needs_bit17_swizzle(struct drm_i915_gem_object *obj)
{
        struct drm_i915_private *dev_priv = to_i915(obj->base.dev);

        return dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_9_10_17 &&
                i915_gem_object_is_tiled(obj);
}

u32 i915_gem_fence_size(struct drm_i915_private *dev_priv, u32 size,
                        unsigned int tiling, unsigned int stride);
u32 i915_gem_fence_alignment(struct drm_i915_private *dev_priv, u32 size,
                             unsigned int tiling, unsigned int stride);

/* i915_debugfs.c */
#ifdef CONFIG_DEBUG_FS
int i915_debugfs_register(struct drm_i915_private *dev_priv);
int i915_debugfs_connector_add(struct drm_connector *connector);
void intel_display_crc_init(struct drm_i915_private *dev_priv);
#else
static inline int i915_debugfs_register(struct drm_i915_private *dev_priv) {return 0;}
static inline int i915_debugfs_connector_add(struct drm_connector *connector)
{ return 0; }
static inline void intel_display_crc_init(struct drm_i915_private *dev_priv) {}
#endif

/* i915_gpu_error.c */
#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)

__printf(2, 3)
void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...);
int i915_error_state_to_str(struct drm_i915_error_state_buf *estr,
                            const struct i915_gpu_state *gpu);
int i915_error_state_buf_init(struct drm_i915_error_state_buf *eb,
                              struct drm_i915_private *i915,
                              size_t count, loff_t pos);
static inline void i915_error_state_buf_release(
        struct drm_i915_error_state_buf *eb)
{
        kfree(eb->buf);
}

struct i915_gpu_state *i915_capture_gpu_state(struct drm_i915_private *i915);
void i915_capture_error_state(struct drm_i915_private *dev_priv,
                              u32 engine_mask,
                              const char *error_msg);

static inline struct i915_gpu_state *
i915_gpu_state_get(struct i915_gpu_state *gpu)
{
        kref_get(&gpu->ref);
        return gpu;
}

void __i915_gpu_state_free(struct kref *kref);
static inline void i915_gpu_state_put(struct i915_gpu_state *gpu)
{
        if (gpu)
                kref_put(&gpu->ref, __i915_gpu_state_free);
}

struct i915_gpu_state *i915_first_error_state(struct drm_i915_private *i915);
void i915_reset_error_state(struct drm_i915_private *i915);

#else

static inline void i915_capture_error_state(struct drm_i915_private *dev_priv,
                                            u32 engine_mask,
                                            const char *error_msg)
{
}

static inline struct i915_gpu_state *
i915_first_error_state(struct drm_i915_private *i915)
{
        return NULL;
}

static inline void i915_reset_error_state(struct drm_i915_private *i915)
{
}

#endif

const char *i915_cache_level_str(struct drm_i915_private *i915, int type);

/* i915_cmd_parser.c */
int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv);
void intel_engine_init_cmd_parser(struct intel_engine_cs *engine);
void intel_engine_cleanup_cmd_parser(struct intel_engine_cs *engine);
int intel_engine_cmd_parser(struct intel_engine_cs *engine,
                            struct drm_i915_gem_object *batch_obj,
                            struct drm_i915_gem_object *shadow_batch_obj,
                            u32 batch_start_offset,
                            u32 batch_len,
                            bool is_master);

/* i915_perf.c */
extern void i915_perf_init(struct drm_i915_private *dev_priv);
extern void i915_perf_fini(struct drm_i915_private *dev_priv);
extern void i915_perf_register(struct drm_i915_private *dev_priv);
extern void i915_perf_unregister(struct drm_i915_private *dev_priv);

/* i915_suspend.c */
extern int i915_save_state(struct drm_i915_private *dev_priv);
extern int i915_restore_state(struct drm_i915_private *dev_priv);

/* i915_sysfs.c */
void i915_setup_sysfs(struct drm_i915_private *dev_priv);
void i915_teardown_sysfs(struct drm_i915_private *dev_priv);

/* intel_lpe_audio.c */
int  intel_lpe_audio_init(struct drm_i915_private *dev_priv);
void intel_lpe_audio_teardown(struct drm_i915_private *dev_priv);
void intel_lpe_audio_irq_handler(struct drm_i915_private *dev_priv);
void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
                            enum pipe pipe, enum port port,
                            const void *eld, int ls_clock, bool dp_output);

/* intel_i2c.c */
extern int intel_setup_gmbus(struct drm_i915_private *dev_priv);
extern void intel_teardown_gmbus(struct drm_i915_private *dev_priv);
extern bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv,
                                     unsigned int pin);

extern struct i2c_adapter *
intel_gmbus_get_adapter(struct drm_i915_private *dev_priv, unsigned int pin);
extern void intel_gmbus_set_speed(struct i2c_adapter *adapter, int speed);
extern void intel_gmbus_force_bit(struct i2c_adapter *adapter, bool force_bit);
static inline bool intel_gmbus_is_forced_bit(struct i2c_adapter *adapter)
{
        return container_of(adapter, struct intel_gmbus, adapter)->force_bit;
}
extern void intel_i2c_reset(struct drm_i915_private *dev_priv);

/* intel_bios.c */
void intel_bios_init(struct drm_i915_private *dev_priv);
void intel_bios_cleanup(struct drm_i915_private *dev_priv);
bool intel_bios_is_valid_vbt(const void *buf, size_t size);
bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv);
bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin);
bool intel_bios_is_port_present(struct drm_i915_private *dev_priv, enum port port);
bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port);
bool intel_bios_is_port_dp_dual_mode(struct drm_i915_private *dev_priv, enum port port);
bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv, enum port *port);
bool intel_bios_is_port_hpd_inverted(struct drm_i915_private *dev_priv,
                                     enum port port);
bool intel_bios_is_lspcon_present(struct drm_i915_private *dev_priv,
                                enum port port);

/* intel_acpi.c */
#ifdef CONFIG_ACPI
extern void intel_register_dsm_handler(void);
extern void intel_unregister_dsm_handler(void);
#else
static inline void intel_register_dsm_handler(void) { return; }
static inline void intel_unregister_dsm_handler(void) { return; }
#endif /* CONFIG_ACPI */

/* intel_device_info.c */
static inline struct intel_device_info *
mkwrite_device_info(struct drm_i915_private *dev_priv)
{
        return (struct intel_device_info *)&dev_priv->info;
}

/* modesetting */
extern void intel_modeset_init_hw(struct drm_device *dev);
extern int intel_modeset_init(struct drm_device *dev);
extern void intel_modeset_cleanup(struct drm_device *dev);
extern int intel_connector_register(struct drm_connector *);
extern void intel_connector_unregister(struct drm_connector *);
extern int intel_modeset_vga_set_state(struct drm_i915_private *dev_priv,
                                       bool state);
extern void intel_display_resume(struct drm_device *dev);
extern void i915_redisable_vga(struct drm_i915_private *dev_priv);
extern void i915_redisable_vga_power_on(struct drm_i915_private *dev_priv);
extern bool ironlake_set_drps(struct drm_i915_private *dev_priv, u8 val);
extern void intel_init_pch_refclk(struct drm_i915_private *dev_priv);
extern int intel_set_rps(struct drm_i915_private *dev_priv, u8 val);
extern bool intel_set_memory_cxsr(struct drm_i915_private *dev_priv,
                                  bool enable);

int i915_reg_read_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file);

/* overlay */
extern struct intel_overlay_error_state *
intel_overlay_capture_error_state(struct drm_i915_private *dev_priv);
extern void intel_overlay_print_error_state(struct drm_i915_error_state_buf *e,
                                            struct intel_overlay_error_state *error);

extern struct intel_display_error_state *
intel_display_capture_error_state(struct drm_i915_private *dev_priv);
extern void intel_display_print_error_state(struct drm_i915_error_state_buf *e,
                                            struct intel_display_error_state *error);

int sandybridge_pcode_read(struct drm_i915_private *dev_priv, u32 mbox, u32 *val);
int sandybridge_pcode_write_timeout(struct drm_i915_private *dev_priv, u32 mbox,
                                    u32 val, int timeout_us);
#define sandybridge_pcode_write(dev_priv, mbox, val)    \
        sandybridge_pcode_write_timeout(dev_priv, mbox, val, 500)

int skl_pcode_request(struct drm_i915_private *dev_priv, u32 mbox, u32 request,
                      u32 reply_mask, u32 reply, int timeout_base_ms);

/* intel_sideband.c */
u32 vlv_punit_read(struct drm_i915_private *dev_priv, u32 addr);
int vlv_punit_write(struct drm_i915_private *dev_priv, u32 addr, u32 val);
u32 vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr);
u32 vlv_iosf_sb_read(struct drm_i915_private *dev_priv, u8 port, u32 reg);
void vlv_iosf_sb_write(struct drm_i915_private *dev_priv, u8 port, u32 reg, u32 val);
u32 vlv_cck_read(struct drm_i915_private *dev_priv, u32 reg);
void vlv_cck_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
u32 vlv_ccu_read(struct drm_i915_private *dev_priv, u32 reg);
void vlv_ccu_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
u32 vlv_bunit_read(struct drm_i915_private *dev_priv, u32 reg);
void vlv_bunit_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
u32 vlv_dpio_read(struct drm_i915_private *dev_priv, enum pipe pipe, int reg);
void vlv_dpio_write(struct drm_i915_private *dev_priv, enum pipe pipe, int reg, u32 val);
u32 intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg,
                   enum intel_sbi_destination destination);
void intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,
                     enum intel_sbi_destination destination);
u32 vlv_flisdsi_read(struct drm_i915_private *dev_priv, u32 reg);
void vlv_flisdsi_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);

/* intel_dpio_phy.c */
void bxt_port_to_phy_channel(struct drm_i915_private *dev_priv, enum port port,
                             enum dpio_phy *phy, enum dpio_channel *ch);
void bxt_ddi_phy_set_signal_level(struct drm_i915_private *dev_priv,
                                  enum port port, u32 margin, u32 scale,
                                  u32 enable, u32 deemphasis);
void bxt_ddi_phy_init(struct drm_i915_private *dev_priv, enum dpio_phy phy);
void bxt_ddi_phy_uninit(struct drm_i915_private *dev_priv, enum dpio_phy phy);
bool bxt_ddi_phy_is_enabled(struct drm_i915_private *dev_priv,
                            enum dpio_phy phy);
bool bxt_ddi_phy_verify_state(struct drm_i915_private *dev_priv,
                              enum dpio_phy phy);
uint8_t bxt_ddi_phy_calc_lane_lat_optim_mask(uint8_t lane_count);
void bxt_ddi_phy_set_lane_optim_mask(struct intel_encoder *encoder,
                                     uint8_t lane_lat_optim_mask);
uint8_t bxt_ddi_phy_get_lane_lat_optim_mask(struct intel_encoder *encoder);

void chv_set_phy_signal_level(struct intel_encoder *encoder,
                              u32 deemph_reg_value, u32 margin_reg_value,
                              bool uniq_trans_scale);
void chv_data_lane_soft_reset(struct intel_encoder *encoder,
                              const struct intel_crtc_state *crtc_state,
                              bool reset);
void chv_phy_pre_pll_enable(struct intel_encoder *encoder,
                            const struct intel_crtc_state *crtc_state);
void chv_phy_pre_encoder_enable(struct intel_encoder *encoder,
                                const struct intel_crtc_state *crtc_state);
void chv_phy_release_cl2_override(struct intel_encoder *encoder);
void chv_phy_post_pll_disable(struct intel_encoder *encoder,
                              const struct intel_crtc_state *old_crtc_state);

void vlv_set_phy_signal_level(struct intel_encoder *encoder,
                              u32 demph_reg_value, u32 preemph_reg_value,
                              u32 uniqtranscale_reg_value, u32 tx3_demph);
void vlv_phy_pre_pll_enable(struct intel_encoder *encoder,
                            const struct intel_crtc_state *crtc_state);
void vlv_phy_pre_encoder_enable(struct intel_encoder *encoder,
                                const struct intel_crtc_state *crtc_state);
void vlv_phy_reset_lanes(struct intel_encoder *encoder,
                         const struct intel_crtc_state *old_crtc_state);

int intel_gpu_freq(struct drm_i915_private *dev_priv, int val);
int intel_freq_opcode(struct drm_i915_private *dev_priv, int val);
u64 intel_rc6_residency_ns(struct drm_i915_private *dev_priv,
                           const i915_reg_t reg);

u32 intel_get_cagf(struct drm_i915_private *dev_priv, u32 rpstat1);

static inline u64 intel_rc6_residency_us(struct drm_i915_private *dev_priv,
                                         const i915_reg_t reg)
{
        return DIV_ROUND_UP_ULL(intel_rc6_residency_ns(dev_priv, reg), 1000);
}

#define I915_READ8(reg)         dev_priv->uncore.funcs.mmio_readb(dev_priv, (reg), true)
#define I915_WRITE8(reg, val)   dev_priv->uncore.funcs.mmio_writeb(dev_priv, (reg), (val), true)

#define I915_READ16(reg)        dev_priv->uncore.funcs.mmio_readw(dev_priv, (reg), true)
#define I915_WRITE16(reg, val)  dev_priv->uncore.funcs.mmio_writew(dev_priv, (reg), (val), true)
#define I915_READ16_NOTRACE(reg)        dev_priv->uncore.funcs.mmio_readw(dev_priv, (reg), false)
#define I915_WRITE16_NOTRACE(reg, val)  dev_priv->uncore.funcs.mmio_writew(dev_priv, (reg), (val), false)

#define I915_READ(reg)          dev_priv->uncore.funcs.mmio_readl(dev_priv, (reg), true)
#define I915_WRITE(reg, val)    dev_priv->uncore.funcs.mmio_writel(dev_priv, (reg), (val), true)
#define I915_READ_NOTRACE(reg)          dev_priv->uncore.funcs.mmio_readl(dev_priv, (reg), false)
#define I915_WRITE_NOTRACE(reg, val)    dev_priv->uncore.funcs.mmio_writel(dev_priv, (reg), (val), false)

/* Be very careful with read/write 64-bit values. On 32-bit machines, they
 * will be implemented using 2 32-bit writes in an arbitrary order with
 * an arbitrary delay between them. This can cause the hardware to
 * act upon the intermediate value, possibly leading to corruption and
 * machine death. For this reason we do not support I915_WRITE64, or
 * dev_priv->uncore.funcs.mmio_writeq.
 *
 * When reading a 64-bit value as two 32-bit values, the delay may cause
 * the two reads to mismatch, e.g. a timestamp overflowing. Also note that
 * occasionally a 64-bit register does not actualy support a full readq
 * and must be read using two 32-bit reads.
 *
 * You have been warned.
 */
#define I915_READ64(reg)        dev_priv->uncore.funcs.mmio_readq(dev_priv, (reg), true)

#define I915_READ64_2x32(lower_reg, upper_reg) ({                       \
        u32 upper, lower, old_upper, loop = 0;                          \
        upper = I915_READ(upper_reg);                                   \
        do {                                                            \
                old_upper = upper;                                      \
                lower = I915_READ(lower_reg);                           \
                upper = I915_READ(upper_reg);                           \
        } while (upper != old_upper && loop++ < 2);                     \
        (u64)upper << 32 | lower; })

#define POSTING_READ(reg)       (void)I915_READ_NOTRACE(reg)
#define POSTING_READ16(reg)     (void)I915_READ16_NOTRACE(reg)

#define __raw_read(x, s) \
static inline uint##x##_t __raw_i915_read##x(const struct drm_i915_private *dev_priv, \
                                             i915_reg_t reg) \
{ \
        return read##s(dev_priv->regs + i915_mmio_reg_offset(reg)); \
}

#define __raw_write(x, s) \
static inline void __raw_i915_write##x(const struct drm_i915_private *dev_priv, \
                                       i915_reg_t reg, uint##x##_t val) \
{ \
        write##s(val, dev_priv->regs + i915_mmio_reg_offset(reg)); \
}
__raw_read(8, b)
__raw_read(16, w)
__raw_read(32, l)
__raw_read(64, q)

__raw_write(8, b)
__raw_write(16, w)
__raw_write(32, l)
__raw_write(64, q)

#undef __raw_read
#undef __raw_write

/* These are untraced mmio-accessors that are only valid to be used inside
 * critical sections, such as inside IRQ handlers, where forcewake is explicitly
 * controlled.
 *
 * Think twice, and think again, before using these.
 *
 * As an example, these accessors can possibly be used between:
 *
 * spin_lock_irq(&dev_priv->uncore.lock);
 * intel_uncore_forcewake_get__locked();
 *
 * and
 *
 * intel_uncore_forcewake_put__locked();
 * spin_unlock_irq(&dev_priv->uncore.lock);
 *
 *
 * Note: some registers may not need forcewake held, so
 * intel_uncore_forcewake_{get,put} can be omitted, see
 * intel_uncore_forcewake_for_reg().
 *
 * Certain architectures will die if the same cacheline is concurrently accessed
 * by different clients (e.g. on Ivybridge). Access to registers should
 * therefore generally be serialised, by either the dev_priv->uncore.lock or
 * a more localised lock guarding all access to that bank of registers.
 */
#define I915_READ_FW(reg__) __raw_i915_read32(dev_priv, (reg__))
#define I915_WRITE_FW(reg__, val__) __raw_i915_write32(dev_priv, (reg__), (val__))
#define I915_WRITE64_FW(reg__, val__) __raw_i915_write64(dev_priv, (reg__), (val__))
#define POSTING_READ_FW(reg__) (void)I915_READ_FW(reg__)

/* "Broadcast RGB" property */
#define INTEL_BROADCAST_RGB_AUTO 0
#define INTEL_BROADCAST_RGB_FULL 1
#define INTEL_BROADCAST_RGB_LIMITED 2

static inline i915_reg_t i915_vgacntrl_reg(struct drm_i915_private *dev_priv)
{
        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                return VLV_VGACNTRL;
        else if (INTEL_GEN(dev_priv) >= 5)
                return CPU_VGACNTRL;
        else
                return VGACNTRL;
}

static inline unsigned long msecs_to_jiffies_timeout(const unsigned int m)
{
        unsigned long j = msecs_to_jiffies(m);

        return min_t(unsigned long, MAX_JIFFY_OFFSET, j + 1);
}

static inline unsigned long nsecs_to_jiffies_timeout(const u64 n)
{
        /* nsecs_to_jiffies64() does not guard against overflow */
        if (NSEC_PER_SEC % HZ &&
            div_u64(n, NSEC_PER_SEC) >= MAX_JIFFY_OFFSET / HZ)
                return MAX_JIFFY_OFFSET;

        return min_t(u64, MAX_JIFFY_OFFSET, nsecs_to_jiffies64(n) + 1);
}

static inline unsigned long
timespec_to_jiffies_timeout(const struct timespec *value)
{
        unsigned long j = timespec_to_jiffies(value);

        return min_t(unsigned long, MAX_JIFFY_OFFSET, j + 1);
}

/*
 * If you need to wait X milliseconds between events A and B, but event B
 * doesn't happen exactly after event A, you record the timestamp (jiffies) of
 * when event A happened, then just before event B you call this function and
 * pass the timestamp as the first argument, and X as the second argument.
 */
static inline void
wait_remaining_ms_from_jiffies(unsigned long timestamp_jiffies, int to_wait_ms)
{
        unsigned long target_jiffies, tmp_jiffies, remaining_jiffies;

        /*
         * Don't re-read the value of "jiffies" every time since it may change
         * behind our back and break the math.
         */
        tmp_jiffies = jiffies;
        target_jiffies = timestamp_jiffies +
                         msecs_to_jiffies_timeout(to_wait_ms);

        if (time_after(target_jiffies, tmp_jiffies)) {
                remaining_jiffies = target_jiffies - tmp_jiffies;
                while (remaining_jiffies)
                        remaining_jiffies =
                            schedule_timeout_uninterruptible(remaining_jiffies);
        }
}

static inline bool
__i915_request_irq_complete(const struct drm_i915_gem_request *req)
{
        struct intel_engine_cs *engine = req->engine;
        u32 seqno;

        /* Note that the engine may have wrapped around the seqno, and
         * so our request->global_seqno will be ahead of the hardware,
         * even though it completed the request before wrapping. We catch
         * this by kicking all the waiters before resetting the seqno
         * in hardware, and also signal the fence.
         */
        if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &req->fence.flags))
                return true;

        /* The request was dequeued before we were awoken. We check after
         * inspecting the hw to confirm that this was the same request
         * that generated the HWS update. The memory barriers within
         * the request execution are sufficient to ensure that a check
         * after reading the value from hw matches this request.
         */
        seqno = i915_gem_request_global_seqno(req);
        if (!seqno)
                return false;

        /* Before we do the heavier coherent read of the seqno,
         * check the value (hopefully) in the CPU cacheline.
         */
        if (__i915_gem_request_completed(req, seqno))
                return true;

        /* Ensure our read of the seqno is coherent so that we
         * do not "miss an interrupt" (i.e. if this is the last
         * request and the seqno write from the GPU is not visible
         * by the time the interrupt fires, we will see that the
         * request is incomplete and go back to sleep awaiting
         * another interrupt that will never come.)
         *
         * Strictly, we only need to do this once after an interrupt,
         * but it is easier and safer to do it every time the waiter
         * is woken.
         */
        if (engine->irq_seqno_barrier &&
            test_and_clear_bit(ENGINE_IRQ_BREADCRUMB, &engine->irq_posted)) {
                struct intel_breadcrumbs *b = &engine->breadcrumbs;

                /* The ordering of irq_posted versus applying the barrier
                 * is crucial. The clearing of the current irq_posted must
                 * be visible before we perform the barrier operation,
                 * such that if a subsequent interrupt arrives, irq_posted
                 * is reasserted and our task rewoken (which causes us to
                 * do another __i915_request_irq_complete() immediately
                 * and reapply the barrier). Conversely, if the clear
                 * occurs after the barrier, then an interrupt that arrived
                 * whilst we waited on the barrier would not trigger a
                 * barrier on the next pass, and the read may not see the
                 * seqno update.
                 */
                engine->irq_seqno_barrier(engine);

                /* If we consume the irq, but we are no longer the bottom-half,
                 * the real bottom-half may not have serialised their own
                 * seqno check with the irq-barrier (i.e. may have inspected
                 * the seqno before we believe it coherent since they see
                 * irq_posted == false but we are still running).
                 */
                spin_lock_irq(&b->irq_lock);
                if (b->irq_wait && b->irq_wait->tsk != current)
                        /* Note that if the bottom-half is changed as we
                         * are sending the wake-up, the new bottom-half will
                         * be woken by whomever made the change. We only have
                         * to worry about when we steal the irq-posted for
                         * ourself.
                         */
                        wake_up_process(b->irq_wait->tsk);
                spin_unlock_irq(&b->irq_lock);

                if (__i915_gem_request_completed(req, seqno))
                        return true;
        }

        return false;
}

void i915_memcpy_init_early(struct drm_i915_private *dev_priv);
bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len);

/* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment,
 * as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot
 * perform the operation. To check beforehand, pass in the parameters to
 * to i915_can_memcpy_from_wc() - since we only care about the low 4 bits,
 * you only need to pass in the minor offsets, page-aligned pointers are
 * always valid.
 *
 * For just checking for SSE4.1, in the foreknowledge that the future use
 * will be correctly aligned, just use i915_has_memcpy_from_wc().
 */
#define i915_can_memcpy_from_wc(dst, src, len) \
        i915_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0)

#define i915_has_memcpy_from_wc() \
        i915_memcpy_from_wc(NULL, NULL, 0)

/* i915_mm.c */
int remap_io_mapping(struct vm_area_struct *vma,
                     unsigned long addr, unsigned long pfn, unsigned long size,
                     struct io_mapping *iomap);

static inline int intel_hws_csb_write_index(struct drm_i915_private *i915)
{
        if (INTEL_GEN(i915) >= 10)
                return CNL_HWS_CSB_WRITE_INDEX;
        else
                return I915_HWS_CSB_WRITE_INDEX;
}

#endif