drm/i915: Remove misleading CSR firmware loading docs

[deliverable/linux.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/hashtable.h>
#include <linux/intel-iommu.h>
#include <linux/kref.h>
#include <linux/pm_qos.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 "i915_params.h"
#include "i915_reg.h"

#include "intel_bios.h"
#include "intel_dpll_mgr.h"
#include "intel_guc.h"
#include "intel_lrc.h"
#include "intel_ringbuffer.h"

#include "i915_gem.h"
#include "i915_gem_gtt.h"
#include "i915_gem_render_state.h"
#include "i915_gem_request.h"

#include "intel_gvt.h"

/* General customization:
 */

#define DRIVER_NAME             "i915"
#define DRIVER_DESC             "Intel Graphics"
#define DRIVER_DATE             "20160711"

#undef WARN_ON
/* Many gcc seem to no see through this and fall over :( */
#if 0
#define WARN_ON(x) ({ \
        bool __i915_warn_cond = (x); \
        if (__builtin_constant_p(__i915_warn_cond)) \
                BUILD_BUG_ON(__i915_warn_cond); \
        WARN(__i915_warn_cond, "WARN_ON(" #x ")"); })
#else
#define WARN_ON(x) WARN((x), "%s", "WARN_ON(" __stringify(x) ")")
#endif

#undef WARN_ON_ONCE
#define WARN_ON_ONCE(x) WARN_ONCE((x), "%s", "WARN_ON_ONCE(" __stringify(x) ")")

#define MISSING_CASE(x) WARN(1, "Missing switch case (%lu) in %s\n", \
                             (long) (x), __func__);

/* 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.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__)

static inline const char *yesno(bool v)
{
        return v ? "yes" : "no";
}

static inline const char *onoff(bool v)
{
        return v ? "on" : "off";
}

enum pipe {
        INVALID_PIPE = -1,
        PIPE_A = 0,
        PIPE_B,
        PIPE_C,
        _PIPE_EDP,
        I915_MAX_PIPES = _PIPE_EDP
};
#define pipe_name(p) ((p) + 'A')

enum transcoder {
        TRANSCODER_A = 0,
        TRANSCODER_B,
        TRANSCODER_C,
        TRANSCODER_EDP,
        TRANSCODER_DSI_A,
        TRANSCODER_DSI_C,
        I915_MAX_TRANSCODERS
};

static inline const char *transcoder_name(enum transcoder transcoder)
{
        switch (transcoder) {
        case TRANSCODER_A:
                return "A";
        case TRANSCODER_B:
                return "B";
        case TRANSCODER_C:
                return "C";
        case TRANSCODER_EDP:
                return "EDP";
        case TRANSCODER_DSI_A:
                return "DSI A";
        case TRANSCODER_DSI_C:
                return "DSI C";
        default:
                return "<invalid>";
        }
}

static inline bool transcoder_is_dsi(enum transcoder transcoder)
{
        return transcoder == TRANSCODER_DSI_A || transcoder == TRANSCODER_DSI_C;
}

/*
 * I915_MAX_PLANES in the enum below is the maximum (across all platforms)
 * number of planes per CRTC.  Not all platforms really have this many planes,
 * which means some arrays of size I915_MAX_PLANES may have unused entries
 * between the topmost sprite plane and the cursor plane.
 */
enum plane {
        PLANE_A = 0,
        PLANE_B,
        PLANE_C,
        PLANE_CURSOR,
        I915_MAX_PLANES,
};
#define plane_name(p) ((p) + 'A')

#define sprite_name(p, s) ((p) * INTEL_INFO(dev)->num_sprites[(p)] + (s) + 'A')

enum port {
        PORT_A = 0,
        PORT_B,
        PORT_C,
        PORT_D,
        PORT_E,
        I915_MAX_PORTS
};
#define port_name(p) ((p) + 'A')

#define I915_NUM_PHYS_VLV 2

enum dpio_channel {
        DPIO_CH0,
        DPIO_CH1
};

enum dpio_phy {
        DPIO_PHY0,
        DPIO_PHY1
};

enum intel_display_power_domain {
        POWER_DOMAIN_PIPE_A,
        POWER_DOMAIN_PIPE_B,
        POWER_DOMAIN_PIPE_C,
        POWER_DOMAIN_PIPE_A_PANEL_FITTER,
        POWER_DOMAIN_PIPE_B_PANEL_FITTER,
        POWER_DOMAIN_PIPE_C_PANEL_FITTER,
        POWER_DOMAIN_TRANSCODER_A,
        POWER_DOMAIN_TRANSCODER_B,
        POWER_DOMAIN_TRANSCODER_C,
        POWER_DOMAIN_TRANSCODER_EDP,
        POWER_DOMAIN_TRANSCODER_DSI_A,
        POWER_DOMAIN_TRANSCODER_DSI_C,
        POWER_DOMAIN_PORT_DDI_A_LANES,
        POWER_DOMAIN_PORT_DDI_B_LANES,
        POWER_DOMAIN_PORT_DDI_C_LANES,
        POWER_DOMAIN_PORT_DDI_D_LANES,
        POWER_DOMAIN_PORT_DDI_E_LANES,
        POWER_DOMAIN_PORT_DSI,
        POWER_DOMAIN_PORT_CRT,
        POWER_DOMAIN_PORT_OTHER,
        POWER_DOMAIN_VGA,
        POWER_DOMAIN_AUDIO,
        POWER_DOMAIN_PLLS,
        POWER_DOMAIN_AUX_A,
        POWER_DOMAIN_AUX_B,
        POWER_DOMAIN_AUX_C,
        POWER_DOMAIN_AUX_D,
        POWER_DOMAIN_GMBUS,
        POWER_DOMAIN_MODESET,
        POWER_DOMAIN_INIT,

        POWER_DOMAIN_NUM,
};

#define POWER_DOMAIN_PIPE(pipe) ((pipe) + POWER_DOMAIN_PIPE_A)
#define POWER_DOMAIN_PIPE_PANEL_FITTER(pipe) \
                ((pipe) + POWER_DOMAIN_PIPE_A_PANEL_FITTER)
#define POWER_DOMAIN_TRANSCODER(tran) \
        ((tran) == TRANSCODER_EDP ? POWER_DOMAIN_TRANSCODER_EDP : \
         (tran) + POWER_DOMAIN_TRANSCODER_A)

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)++)

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;

        /*
         * 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)

#define for_each_pipe(__dev_priv, __p) \
        for ((__p) = 0; (__p) < INTEL_INFO(__dev_priv)->num_pipes; (__p)++)
#define for_each_pipe_masked(__dev_priv, __p, __mask) \
        for ((__p) = 0; (__p) < INTEL_INFO(__dev_priv)->num_pipes; (__p)++) \
                for_each_if ((__mask) & (1 << (__p)))
#define for_each_plane(__dev_priv, __pipe, __p)                         \
        for ((__p) = 0;                                                 \
             (__p) < INTEL_INFO(__dev_priv)->num_sprites[(__pipe)] + 1; \
             (__p)++)
#define for_each_sprite(__dev_priv, __p, __s)                           \
        for ((__s) = 0;                                                 \
             (__s) < INTEL_INFO(__dev_priv)->num_sprites[(__p)];        \
             (__s)++)

#define for_each_port_masked(__port, __ports_mask) \
        for ((__port) = PORT_A; (__port) < I915_MAX_PORTS; (__port)++)  \
                for_each_if ((__ports_mask) & (1 << (__port)))

#define for_each_crtc(dev, crtc) \
        list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head)

#define for_each_intel_plane(dev, intel_plane) \
        list_for_each_entry(intel_plane,                        \
                            &(dev)->mode_config.plane_list,     \
                            base.head)

#define for_each_intel_plane_mask(dev, intel_plane, plane_mask)         \
        list_for_each_entry(intel_plane,                                \
                            &(dev)->mode_config.plane_list,             \
                            base.head)                                  \
                for_each_if ((plane_mask) &                             \
                             (1 << drm_plane_index(&intel_plane->base)))

#define for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane)      \
        list_for_each_entry(intel_plane,                                \
                            &(dev)->mode_config.plane_list,             \
                            base.head)                                  \
                for_each_if ((intel_plane)->pipe == (intel_crtc)->pipe)

#define for_each_intel_crtc(dev, intel_crtc)                            \
        list_for_each_entry(intel_crtc,                                 \
                            &(dev)->mode_config.crtc_list,              \
                            base.head)

#define for_each_intel_crtc_mask(dev, intel_crtc, crtc_mask)            \
        list_for_each_entry(intel_crtc,                                 \
                            &(dev)->mode_config.crtc_list,              \
                            base.head)                                  \
                for_each_if ((crtc_mask) & (1 << drm_crtc_index(&intel_crtc->base)))

#define for_each_intel_encoder(dev, intel_encoder)              \
        list_for_each_entry(intel_encoder,                      \
                            &(dev)->mode_config.encoder_list,   \
                            base.head)

#define for_each_intel_connector(dev, intel_connector)          \
        list_for_each_entry(intel_connector,                    \
                            &(dev)->mode_config.connector_list, \
                            base.head)

#define for_each_encoder_on_crtc(dev, __crtc, intel_encoder) \
        list_for_each_entry((intel_encoder), &(dev)->mode_config.encoder_list, base.head) \
                for_each_if ((intel_encoder)->base.crtc == (__crtc))

#define for_each_connector_on_encoder(dev, __encoder, intel_connector) \
        list_for_each_entry((intel_connector), &(dev)->mode_config.connector_list, base.head) \
                for_each_if ((intel_connector)->base.encoder == (__encoder))

#define for_each_power_domain(domain, mask)                             \
        for ((domain) = 0; (domain) < POWER_DOMAIN_NUM; (domain)++)     \
                for_each_if ((1 << (domain)) & (mask))

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 {
                struct list_head link;
                unsigned boosts;
        } rps;

        unsigned int bsd_ring;
};

/* Used by dp and fdi links */
struct intel_link_m_n {
        uint32_t        tu;
        uint32_t        gmch_m;
        uint32_t        gmch_n;
        uint32_t        link_m;
        uint32_t        link_n;
};

void intel_link_compute_m_n(int bpp, int nlanes,
                            int pixel_clock, int link_clock,
                            struct intel_link_m_n *m_n);

/* 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

#define WATCH_LISTS     0

struct opregion_header;
struct opregion_acpi;
struct opregion_swsci;
struct opregion_asle;

struct intel_opregion {
        struct opregion_header *header;
        struct opregion_acpi *acpi;
        struct opregion_swsci *swsci;
        u32 swsci_gbda_sub_functions;
        u32 swsci_sbcb_sub_functions;
        struct opregion_asle *asle;
        void *rvda;
        const void *vbt;
        u32 vbt_size;
        u32 *lid_state;
        struct work_struct asle_work;
};
#define OPREGION_SIZE            (8*1024)

struct intel_overlay;
struct intel_overlay_error_state;

#define I915_FENCE_REG_NONE -1
#define I915_MAX_NUM_FENCES 32
/* 32 fences + sign bit for FENCE_REG_NONE */
#define I915_MAX_NUM_FENCE_BITS 6

struct drm_i915_fence_reg {
        struct list_head lru_list;
        struct drm_i915_gem_object *obj;
        int pin_count;
};

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

struct intel_display_error_state;

struct drm_i915_error_state {
        struct kref ref;
        struct timeval time;

        char error_msg[128];
        bool simulated;
        int iommu;
        u32 reset_count;
        u32 suspend_count;

        /* Generic register state */
        u32 eir;
        u32 pgtbl_er;
        u32 ier;
        u32 gtier[4];
        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 extra_instdone[I915_NUM_INSTDONE_REG];
        u64 fence[I915_MAX_NUM_FENCES];
        struct intel_overlay_error_state *overlay;
        struct intel_display_error_state *display;
        struct drm_i915_error_object *semaphore_obj;

        struct drm_i915_error_ring {
                bool valid;
                /* Software tracked state */
                bool waiting;
                int num_waiters;
                int hangcheck_score;
                enum intel_ring_hangcheck_action hangcheck_action;
                int num_requests;

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

                u32 last_seqno;
                u32 semaphore_seqno[I915_NUM_ENGINES - 1];

                /* Register state */
                u32 start;
                u32 tail;
                u32 head;
                u32 ctl;
                u32 hws;
                u32 ipeir;
                u32 ipehr;
                u32 instdone;
                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 drm_i915_error_object {
                        int page_count;
                        u64 gtt_offset;
                        u32 *pages[0];
                } *ringbuffer, *batchbuffer, *wa_batchbuffer, *ctx, *hws_page;

                struct drm_i915_error_object *wa_ctx;

                struct drm_i915_error_request {
                        long jiffies;
                        u32 seqno;
                        u32 tail;
                } *requests;

                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;

                pid_t pid;
                char comm[TASK_COMM_LEN];
        } ring[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;
                s32 pinned:2;
                u32 tiling:2;
                u32 dirty:1;
                u32 purgeable:1;
                u32 userptr:1;
                s32 ring:4;
                u32 cache_level:3;
        } **active_bo, **pinned_bo;

        u32 *active_bo_count, *pinned_bo_count;
        u32 vm_count;
};

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

struct drm_i915_display_funcs {
        int (*get_display_clock_speed)(struct drm_device *dev);
        int (*get_fifo_size)(struct drm_device *dev, int 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_crtc_state *cstate);
        void (*optimize_watermarks)(struct intel_crtc_state *cstate);
        int (*compute_global_watermarks)(struct drm_atomic_state *state);
        void (*update_wm)(struct drm_crtc *crtc);
        int (*modeset_calc_cdclk)(struct drm_atomic_state *state);
        void (*modeset_commit_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 drm_crtc *crtc);
        void (*crtc_disable)(struct drm_crtc *crtc);
        void (*audio_codec_enable)(struct drm_connector *connector,
                                   struct intel_encoder *encoder,
                                   const struct drm_display_mode *adjusted_mode);
        void (*audio_codec_disable)(struct intel_encoder *encoder);
        void (*fdi_link_train)(struct drm_crtc *crtc);
        void (*init_clock_gating)(struct drm_device *dev);
        int (*queue_flip)(struct drm_device *dev, struct drm_crtc *crtc,
                          struct drm_framebuffer *fb,
                          struct drm_i915_gem_object *obj,
                          struct drm_i915_gem_request *req,
                          uint32_t flags);
        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);
};

enum forcewake_domain_id {
        FW_DOMAIN_ID_RENDER = 0,
        FW_DOMAIN_ID_BLITTER,
        FW_DOMAIN_ID_MEDIA,

        FW_DOMAIN_ID_COUNT
};

enum forcewake_domains {
        FORCEWAKE_RENDER = (1 << FW_DOMAIN_ID_RENDER),
        FORCEWAKE_BLITTER = (1 << FW_DOMAIN_ID_BLITTER),
        FORCEWAKE_MEDIA = (1 << FW_DOMAIN_ID_MEDIA),
        FORCEWAKE_ALL = (FORCEWAKE_RENDER |
                         FORCEWAKE_BLITTER |
                         FORCEWAKE_MEDIA)
};

#define FW_REG_READ  (1)
#define FW_REG_WRITE (2)

enum forcewake_domains
intel_uncore_forcewake_for_reg(struct drm_i915_private *dev_priv,
                               i915_reg_t reg, unsigned int op);

struct intel_uncore_funcs {
        void (*force_wake_get)(struct drm_i915_private *dev_priv,
                                                        enum forcewake_domains domains);
        void (*force_wake_put)(struct drm_i915_private *dev_priv,
                                                        enum forcewake_domains domains);

        uint8_t  (*mmio_readb)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
        uint16_t (*mmio_readw)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
        uint32_t (*mmio_readl)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
        uint64_t (*mmio_readq)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);

        void (*mmio_writeb)(struct drm_i915_private *dev_priv, i915_reg_t r,
                                uint8_t val, bool trace);
        void (*mmio_writew)(struct drm_i915_private *dev_priv, i915_reg_t r,
                                uint16_t val, bool trace);
        void (*mmio_writel)(struct drm_i915_private *dev_priv, i915_reg_t r,
                                uint32_t val, bool trace);
        void (*mmio_writeq)(struct drm_i915_private *dev_priv, i915_reg_t r,
                                uint64_t val, bool trace);
};

struct intel_uncore {
        spinlock_t lock; /** lock is also taken in irq contexts. */

        struct intel_uncore_funcs funcs;

        unsigned fifo_count;
        enum forcewake_domains fw_domains;

        struct intel_uncore_forcewake_domain {
                struct drm_i915_private *i915;
                enum forcewake_domain_id id;
                enum forcewake_domains mask;
                unsigned wake_count;
                struct hrtimer timer;
                i915_reg_t reg_set;
                u32 val_set;
                u32 val_clear;
                i915_reg_t reg_ack;
                i915_reg_t reg_post;
                u32 val_reset;
        } fw_domain[FW_DOMAIN_ID_COUNT];

        int unclaimed_mmio_check;
};

/* Iterate over initialised fw domains */
#define for_each_fw_domain_masked(domain__, mask__, dev_priv__) \
        for ((domain__) = &(dev_priv__)->uncore.fw_domain[0]; \
             (domain__) < &(dev_priv__)->uncore.fw_domain[FW_DOMAIN_ID_COUNT]; \
             (domain__)++) \
                for_each_if ((mask__) & (domain__)->mask)

#define for_each_fw_domain(domain__, dev_priv__) \
        for_each_fw_domain_masked(domain__, FORCEWAKE_ALL, dev_priv__)

#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;
};

#define DEV_INFO_FOR_EACH_FLAG(func, sep) \
        func(is_mobile) sep \
        func(is_i85x) sep \
        func(is_i915g) sep \
        func(is_i945gm) sep \
        func(is_g33) sep \
        func(need_gfx_hws) sep \
        func(is_g4x) sep \
        func(is_pineview) sep \
        func(is_broadwater) sep \
        func(is_crestline) sep \
        func(is_ivybridge) sep \
        func(is_valleyview) sep \
        func(is_cherryview) sep \
        func(is_haswell) sep \
        func(is_broadwell) sep \
        func(is_skylake) sep \
        func(is_broxton) sep \
        func(is_kabylake) sep \
        func(is_preliminary) sep \
        func(has_fbc) sep \
        func(has_pipe_cxsr) sep \
        func(has_hotplug) sep \
        func(cursor_needs_physical) sep \
        func(has_overlay) sep \
        func(overlay_needs_physical) sep \
        func(supports_tv) sep \
        func(has_llc) sep \
        func(has_snoop) sep \
        func(has_ddi) sep \
        func(has_fpga_dbg) sep \
        func(has_pooled_eu)

#define DEFINE_FLAG(name) u8 name:1
#define SEP_SEMICOLON ;

struct intel_device_info {
        u32 display_mmio_offset;
        u16 device_id;
        u8 num_pipes;
        u8 num_sprites[I915_MAX_PIPES];
        u8 gen;
        u16 gen_mask;
        u8 ring_mask; /* Rings supported by the HW */
        DEV_INFO_FOR_EACH_FLAG(DEFINE_FLAG, SEP_SEMICOLON);
        /* Register offsets for the various display pipes and transcoders */
        int pipe_offsets[I915_MAX_TRANSCODERS];
        int trans_offsets[I915_MAX_TRANSCODERS];
        int palette_offsets[I915_MAX_PIPES];
        int cursor_offsets[I915_MAX_PIPES];

        /* Slice/subslice/EU info */
        u8 slice_total;
        u8 subslice_total;
        u8 subslice_per_slice;
        u8 eu_total;
        u8 eu_per_subslice;
        u8 min_eu_in_pool;
        /* For each slice, which subslice(s) has(have) 7 EUs (bitfield)? */
        u8 subslice_7eu[3];
        u8 has_slice_pg:1;
        u8 has_subslice_pg:1;
        u8 has_eu_pg:1;

        struct color_luts {
                u16 degamma_lut_size;
                u16 gamma_lut_size;
        } color;
};

#undef DEFINE_FLAG
#undef SEP_SEMICOLON

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 */
};

struct i915_ctx_hang_stats {
        /* This context had batch pending when hang was declared */
        unsigned batch_pending;

        /* This context had batch active when hang was declared */
        unsigned batch_active;

        /* Time when this context was last blamed for a GPU reset */
        unsigned long guilty_ts;

        /* If the contexts causes a second GPU hang within this time,
         * it is permanently banned from submitting any more work.
         */
        unsigned long ban_period_seconds;

        /* This context is banned to submit more work */
        bool banned;
};

/* This must match up with the value previously used for execbuf2.rsvd1. */
#define DEFAULT_CONTEXT_HANDLE 0

/**
 * struct i915_gem_context - as the name implies, represents a context.
 * @ref: reference count.
 * @user_handle: userspace tracking identity for this context.
 * @remap_slice: l3 row remapping information.
 * @flags: context specific flags:
 *         CONTEXT_NO_ZEROMAP: do not allow mapping things to page 0.
 * @file_priv: filp associated with this context (NULL for global default
 *             context).
 * @hang_stats: information about the role of this context in possible GPU
 *              hangs.
 * @ppgtt: virtual memory space used by this context.
 * @legacy_hw_ctx: render context backing object and whether it is correctly
 *                initialized (legacy ring submission mechanism only).
 * @link: link in the global list of contexts.
 *
 * Contexts are memory images used by the hardware to store copies of their
 * internal state.
 */
struct i915_gem_context {
        struct kref ref;
        struct drm_i915_private *i915;
        struct drm_i915_file_private *file_priv;
        struct i915_hw_ppgtt *ppgtt;

        struct i915_ctx_hang_stats hang_stats;

        /* Unique identifier for this context, used by the hw for tracking */
        unsigned long flags;
#define CONTEXT_NO_ZEROMAP              BIT(0)
#define CONTEXT_NO_ERROR_CAPTURE        BIT(1)
        unsigned hw_id;
        u32 user_handle;

        u32 ggtt_alignment;

        struct intel_context {
                struct drm_i915_gem_object *state;
                struct intel_ringbuffer *ringbuf;
                struct i915_vma *lrc_vma;
                uint32_t *lrc_reg_state;
                u64 lrc_desc;
                int pin_count;
                bool initialised;
        } engine[I915_NUM_ENGINES];
        u32 ring_size;
        u32 desc_template;
        struct atomic_notifier_head status_notifier;
        bool execlists_force_single_submission;

        struct list_head link;

        u8 remap_slice;
};

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;

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

                struct {
                        unsigned int rotation;
                        int src_w;
                        int src_h;
                        bool visible;
                } plane;

                struct {
                        u64 ilk_ggtt_offset;
                        uint32_t pixel_format;
                        unsigned int stride;
                        int fence_reg;
                        unsigned int tiling_mode;
                } fb;
        } state_cache;

        struct intel_fbc_reg_params {
                struct {
                        enum pipe pipe;
                        enum plane plane;
                        unsigned int fence_y_offset;
                } crtc;

                struct {
                        u64 ggtt_offset;
                        uint32_t pixel_format;
                        unsigned int stride;
                        int fence_reg;
                } fb;

                int cfb_size;
        } 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;
};

enum intel_pch {
        PCH_NONE = 0,   /* No PCH present */
        PCH_IBX,        /* Ibexpeak PCH */
        PCH_CPT,        /* Cougarpoint PCH */
        PCH_LPT,        /* Lynxpoint PCH */
        PCH_SPT,        /* Sunrisepoint PCH */
        PCH_KBP,        /* Kabypoint PCH */
        PCH_NOP,
};

enum intel_sbi_destination {
        SBI_ICLK,
        SBI_MPHY,
};

#define QUIRK_PIPEA_FORCE (1<<0)
#define QUIRK_LVDS_SSC_DISABLE (1<<1)
#define QUIRK_INVERT_BRIGHTNESS (1<<2)
#define QUIRK_BACKLIGHT_PRESENT (1<<3)
#define QUIRK_PIPEB_FORCE (1<<4)
#define QUIRK_PIN_SWIZZLED_PAGES (1<<5)

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 saveLVDS;
        u32 savePP_ON_DELAYS;
        u32 savePP_OFF_DELAYS;
        u32 savePP_ON;
        u32 savePP_OFF;
        u32 savePP_CONTROL;
        u32 savePP_DIVISOR;
        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 {
        u32 cz_clock;
        u32 render_c0;
        u32 media_c0;
};

struct intel_gen6_power_mgmt {
        /*
         * work, interrupts_enabled and pm_iir are protected by
         * dev_priv->irq_lock
         */
        struct work_struct work;
        bool interrupts_enabled;
        u32 pm_iir;

        u32 pm_intr_keep;

        /* 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;

        spinlock_t client_lock;
        struct list_head clients;
        bool client_boost;

        bool enabled;
        unsigned boosts;

        /* manual wa residency calculations */
        struct intel_rps_ei up_ei, down_ei;

        /*
         * 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 hw_lock;
};

/* 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;
        unsigned long domains;
        unsigned long data;
        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;

        /** 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) but still have
         * (presumably uncached) pages still attached.
         */
        struct list_head unbound_list;

        /** Usable portion of the GTT for GEM */
        unsigned long stolen_base; /* limited to low memory (32-bit) */

        /** 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;
        bool shrinker_no_lock_stealing;

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

        /**
         * Are we in a non-interruptible section of code like
         * modesetting?
         */
        bool interruptible;

        /* the indicator for dispatch video commands on two BSD rings */
        unsigned int bsd_ring_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;
        size_t 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;
};

struct i915_error_state_file_priv {
        struct drm_device *dev;
        struct drm_i915_error_state *error;
};

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)
        /* Hang gpu twice in this window and your context gets banned */
#define DRM_I915_CTX_BAN_PERIOD DIV_ROUND_UP(8*DRM_I915_HANGCHECK_PERIOD, 1000)

        struct delayed_work hangcheck_work;

        /* For reset and error_state handling. */
        spinlock_t lock;
        /* Protected by the above dev->gpu_error.lock. */
        struct drm_i915_error_state *first_error;

        unsigned long missed_irq_rings;

        /**
         * State variable controlling the reset flow and count
         *
         * This is a counter which gets incremented when reset is triggered,
         * and again when reset has been handled. So odd values (lowest bit set)
         * means that reset is in progress and even values that
         * (reset_counter >> 1):th reset was successfully completed.
         *
         * 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.
         */
        atomic_t reset_counter;

#define I915_RESET_IN_PROGRESS_FLAG     1
#define I915_WEDGED                     (1 << 31)

        /**
         * 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 {
        /*
         * 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 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 */
                enum intel_backlight_type type;
        } backlight;

        /* MIPI DSI */
        struct {
                u16 panel_id;
                struct mipi_config *config;
                struct mipi_pps_data *pps;
                u8 seq_version;
                u32 size;
                u8 *data;
                const u8 *sequence[MIPI_SEQ_MAX];
        } dsi;

        int crt_ddc_pin;

        int child_dev_num;
        union 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 vlv_pipe_wm {
        uint16_t primary;
        uint16_t sprite[2];
        uint8_t cursor;
};

struct vlv_sr_wm {
        uint16_t plane;
        uint8_t cursor;
};

struct vlv_wm_values {
        struct vlv_pipe_wm pipe[3];
        struct vlv_sr_wm sr;
        struct {
                uint8_t cursor;
                uint8_t sprite[2];
                uint8_t primary;
        } ddl[3];
        uint8_t level;
        bool cxsr;
};

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 pipe[I915_MAX_PIPES];
        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;
        uint32_t wm_linetime[I915_MAX_PIPES];
        uint32_t plane[I915_MAX_PIPES][I915_MAX_PLANES][8];
        uint32_t plane_trans[I915_MAX_PIPES][I915_MAX_PLANES];
};

struct skl_wm_level {
        bool plane_en[I915_MAX_PLANES];
        uint16_t plane_res_b[I915_MAX_PLANES];
        uint8_t plane_res_l[I915_MAX_PLANES];
};

/*
 * 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;
        atomic_t atomic_seq;
        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;
};

struct i915_frontbuffer_tracking {
        struct mutex 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;
};

/*
 * RING_MAX_NONPRIV_SLOTS is per-engine but at this point we are only
 * allowing it for RCS as we don't foresee any requirement of having
 * a whitelist for other engines. When it is really required for
 * other engines then the limit need to be increased.
 */
#define I915_MAX_WA_REGS (16 + RING_MAX_NONPRIV_SLOTS)

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;
};

struct i915_execbuffer_params {
        struct drm_device               *dev;
        struct drm_file                 *file;
        uint32_t                        dispatch_flags;
        uint32_t                        args_batch_start_offset;
        uint64_t                        batch_obj_vm_offset;
        struct intel_engine_cs *engine;
        struct drm_i915_gem_object      *batch_obj;
        struct i915_gem_context            *ctx;
        struct drm_i915_gem_request     *request;
};

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

struct drm_i915_private {
        struct drm_device drm;

        struct kmem_cache *objects;
        struct kmem_cache *vmas;
        struct kmem_cache *requests;

        const struct intel_device_info info;

        int relative_constants_mode;

        void __iomem *regs;

        struct intel_uncore uncore;

        struct i915_virtual_gpu vgpu;

        struct intel_gvt gvt;

        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;

        wait_queue_head_t gmbus_wait_queue;

        struct pci_dev *bridge_dev;
        struct i915_gem_context *kernel_context;
        struct intel_engine_cs engine[I915_NUM_ENGINES];
        struct drm_i915_gem_object *semaphore_obj;
        uint32_t last_seqno, next_seqno;

        struct drm_dma_handle *status_page_dmah;
        struct resource mch_res;

        /* protects the irq masks */
        spinlock_t irq_lock;

        /* protects the mmio flip data */
        spinlock_t mmio_flip_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_irq_mask;
        u32 pm_rps_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 cdclk_freq, max_cdclk_freq, atomic_cdclk_freq;
        unsigned int max_dotclk_freq;
        unsigned int rawclk_freq;
        unsigned int hpll_freq;
        unsigned int czclk_freq;

        struct {
                unsigned int vco, ref;
        } cdclk_pll;

        /**
         * 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;

        /* 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 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;

        /* 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 context_hw_ida;
#define MAX_CONTEXT_HW_ID (1<<21) /* exclusive */

        /* Kernel Modesetting */

        struct drm_crtc *plane_to_crtc_mapping[I915_MAX_PIPES];
        struct drm_crtc *pipe_to_crtc_mapping[I915_MAX_PIPES];
        wait_queue_head_t pending_flip_queue;

#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;
        unsigned int min_pixclk[I915_MAX_PIPES];

        int dpio_phy_iosf_port[I915_NUM_PHYS_VLV];

        struct i915_workarounds workarounds;

        struct i915_frontbuffer_tracking fb_tracking;

        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;

        /* gen6+ rps state */
        struct intel_gen6_power_mgmt rps;

        /* 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;

#ifdef CONFIG_DRM_FBDEV_EMULATION
        /* list of fbdev register on this device */
        struct intel_fbdev *fbdev;
        struct work_struct fbdev_suspend_work;
#endif

        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;

        uint32_t hw_context_size;
        struct list_head context_list;

        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;

        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];

                /*
                 * The skl_wm_values structure is a bit too big for stack
                 * allocation, so we keep the staging struct where we store
                 * intermediate results here instead.
                 */
                struct skl_wm_values skl_results;

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

                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 pm;

        /* Abstract the submission mechanism (legacy ringbuffer or execlists) away */
        struct {
                int (*execbuf_submit)(struct i915_execbuffer_params *params,
                                      struct drm_i915_gem_execbuffer2 *args,
                                      struct list_head *vmas);
                void (*cleanup_engine)(struct intel_engine_cs *engine);
                void (*stop_engine)(struct intel_engine_cs *engine);

                /**
                 * 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.
                 */
                unsigned int active_engines;
                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;
        } gt;

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

        struct intel_encoder *dig_port_map[I915_MAX_PORTS];

        /*
         * 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 *dev_to_i915(struct device *dev)
{
        return to_i915(dev_get_drvdata(dev));
}

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

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

/* Iterator with engine_id */
#define for_each_engine_id(engine__, dev_priv__, id__) \
        for ((engine__) = &(dev_priv__)->engine[0], (id__) = 0; \
             (engine__) < &(dev_priv__)->engine[I915_NUM_ENGINES]; \
             (engine__)++) \
                for_each_if (((id__) = (engine__)->id, \
                              intel_engine_initialized(engine__)))

/* Iterator over subset of engines selected by mask */
#define for_each_engine_masked(engine__, dev_priv__, mask__) \
        for ((engine__) = &(dev_priv__)->engine[0]; \
             (engine__) < &(dev_priv__)->engine[I915_NUM_ENGINES]; \
             (engine__)++) \
                for_each_if (((mask__) & intel_engine_flag(engine__)) && \
                             intel_engine_initialized(engine__))

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)

struct drm_i915_gem_object_ops {
        unsigned int flags;
#define I915_GEM_OBJECT_HAS_STRUCT_PAGE 0x1

        /* Interface between the GEM object and its backing storage.
         * get_pages() is called once prior to the use of the associated set
         * of pages before to binding them into the GTT, and put_pages() is
         * called after we no longer need them. As we expect there to be
         * associated cost with migrating pages between the backing storage
         * and making them available for the GPU (e.g. clflush), we may hold
         * onto the pages after they are no longer referenced by the GPU
         * in case they may be used again shortly (for example migrating the
         * pages to a different memory domain within the GTT). put_pages()
         * will therefore most likely be called when the object itself is
         * being released or under memory pressure (where we attempt to
         * reap pages for the shrinker).
         */
        int (*get_pages)(struct drm_i915_gem_object *);
        void (*put_pages)(struct drm_i915_gem_object *);

        int (*dmabuf_export)(struct drm_i915_gem_object *);
        void (*release)(struct drm_i915_gem_object *);
};

/*
 * 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_BITS \
        (INTEL_FRONTBUFFER_BITS_PER_PIPE * I915_MAX_PIPES)
#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)))

struct drm_i915_gem_object {
        struct drm_gem_object base;

        const struct drm_i915_gem_object_ops *ops;

        /** List of VMAs backed by this object */
        struct list_head vma_list;

        /** Stolen memory for this object, instead of being backed by shmem. */
        struct drm_mm_node *stolen;
        struct list_head global_list;

        struct list_head engine_list[I915_NUM_ENGINES];
        /** Used in execbuf to temporarily hold a ref */
        struct list_head obj_exec_link;

        struct list_head batch_pool_link;

        /**
         * This is set if the object is on the active lists (has pending
         * rendering and so a non-zero seqno), and is not set if it i s on
         * inactive (ready to be unbound) list.
         */
        unsigned int active:I915_NUM_ENGINES;

        /**
         * This is set if the object has been written to since last bound
         * to the GTT
         */
        unsigned int dirty:1;

        /**
         * Fence register bits (if any) for this object.  Will be set
         * as needed when mapped into the GTT.
         * Protected by dev->struct_mutex.
         */
        signed int fence_reg:I915_MAX_NUM_FENCE_BITS;

        /**
         * Advice: are the backing pages purgeable?
         */
        unsigned int madv:2;

        /**
         * Current tiling mode for the object.
         */
        unsigned int tiling_mode:2;
        /**
         * Whether the tiling parameters for the currently associated fence
         * register have changed. Note that for the purposes of tracking
         * tiling changes we also treat the unfenced register, the register
         * slot that the object occupies whilst it executes a fenced
         * command (such as BLT on gen2/3), as a "fence".
         */
        unsigned int fence_dirty:1;

        /**
         * Is the object at the current location in the gtt mappable and
         * fenceable? Used to avoid costly recalculations.
         */
        unsigned int map_and_fenceable:1;

        /**
         * Whether the current gtt mapping needs to be mappable (and isn't just
         * mappable by accident). Track pin and fault separate for a more
         * accurate mappable working set.
         */
        unsigned int fault_mappable:1;

        /*
         * Is the object to be mapped as read-only to the GPU
         * Only honoured if hardware has relevant pte bit
         */
        unsigned long gt_ro:1;
        unsigned int cache_level:3;
        unsigned int cache_dirty:1;

        unsigned int frontbuffer_bits:INTEL_FRONTBUFFER_BITS;

        unsigned int has_wc_mmap;
        unsigned int pin_display;

        struct sg_table *pages;
        int pages_pin_count;
        struct get_page {
                struct scatterlist *sg;
                int last;
        } get_page;
        void *mapping;

        /** Breadcrumb of last rendering to the buffer.
         * There can only be one writer, but we allow for multiple readers.
         * If there is a writer that necessarily implies that all other
         * read requests are complete - but we may only be lazily clearing
         * the read requests. A read request is naturally the most recent
         * request on a ring, so we may have two different write and read
         * requests on one ring where the write request is older than the
         * read request. This allows for the CPU to read from an active
         * buffer by only waiting for the write to complete.
         * */
        struct drm_i915_gem_request *last_read_req[I915_NUM_ENGINES];
        struct drm_i915_gem_request *last_write_req;
        /** Breadcrumb of last fenced GPU access to the buffer. */
        struct drm_i915_gem_request *last_fenced_req;

        /** Current tiling stride for the object, if it's tiled. */
        uint32_t stride;

        /** References from framebuffers, locks out tiling changes. */
        unsigned long framebuffer_references;

        /** Record of address bit 17 of each page at last unbind. */
        unsigned long *bit_17;

        union {
                /** for phy allocated objects */
                struct drm_dma_handle *phys_handle;

                struct i915_gem_userptr {
                        uintptr_t ptr;
                        unsigned read_only :1;
                        unsigned workers :4;
#define I915_GEM_USERPTR_MAX_WORKERS 15

                        struct i915_mm_struct *mm;
                        struct i915_mmu_object *mmu_object;
                        struct work_struct *work;
                } userptr;
        };
};

static inline struct drm_i915_gem_object *
to_intel_bo(struct drm_gem_object *gem)
{
        /* Assert that to_intel_bo(NULL) == NULL */
        BUILD_BUG_ON(offsetof(struct drm_i915_gem_object, base));

        return container_of(gem, struct drm_i915_gem_object, base);
}

static inline struct drm_i915_gem_object *
i915_gem_object_lookup(struct drm_file *file, u32 handle)
{
        return to_intel_bo(drm_gem_object_lookup(file, handle));
}

__deprecated
extern struct drm_gem_object *
drm_gem_object_lookup(struct drm_file *file, u32 handle);

__attribute__((nonnull))
static inline struct drm_i915_gem_object *
i915_gem_object_get(struct drm_i915_gem_object *obj)
{
        drm_gem_object_reference(&obj->base);
        return obj;
}

__deprecated
extern void drm_gem_object_reference(struct drm_gem_object *);

__attribute__((nonnull))
static inline void
i915_gem_object_put(struct drm_i915_gem_object *obj)
{
        drm_gem_object_unreference(&obj->base);
}

__deprecated
extern void drm_gem_object_unreference(struct drm_gem_object *);

__attribute__((nonnull))
static inline void
i915_gem_object_put_unlocked(struct drm_i915_gem_object *obj)
{
        drm_gem_object_unreference_unlocked(&obj->base);
}

__deprecated
extern void drm_gem_object_unreference_unlocked(struct drm_gem_object *);

static inline bool
i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
{
        return obj->ops->flags & I915_GEM_OBJECT_HAS_STRUCT_PAGE;
}

/*
 * 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;
}

/**
 * __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 :
                likely(!sg_is_chain(++sg)) ? sg :
                sg_chain_ptr(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))

/**
 * 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))

/*
 * A command that requires special handling by the command parser.
 */
struct drm_i915_cmd_descriptor {
        /*
         * Flags describing how the command parser processes the command.
         *
         * CMD_DESC_FIXED: The command has a fixed length if this is set,
         *                 a length mask if not set
         * CMD_DESC_SKIP: The command is allowed but does not follow the
         *                standard length encoding for the opcode range in
         *                which it falls
         * CMD_DESC_REJECT: The command is never allowed
         * CMD_DESC_REGISTER: The command should be checked against the
         *                    register whitelist for the appropriate ring
         * CMD_DESC_MASTER: The command is allowed if the submitting process
         *                  is the DRM master
         */
        u32 flags;
#define CMD_DESC_FIXED    (1<<0)
#define CMD_DESC_SKIP     (1<<1)
#define CMD_DESC_REJECT   (1<<2)
#define CMD_DESC_REGISTER (1<<3)
#define CMD_DESC_BITMASK  (1<<4)
#define CMD_DESC_MASTER   (1<<5)

        /*
         * The command's unique identification bits and the bitmask to get them.
         * This isn't strictly the opcode field as defined in the spec and may
         * also include type, subtype, and/or subop fields.
         */
        struct {
                u32 value;
                u32 mask;
        } cmd;

        /*
         * The command's length. The command is either fixed length (i.e. does
         * not include a length field) or has a length field mask. The flag
         * CMD_DESC_FIXED indicates a fixed length. Otherwise, the command has
         * a length mask. All command entries in a command table must include
         * length information.
         */
        union {
                u32 fixed;
                u32 mask;
        } length;

        /*
         * Describes where to find a register address in the command to check
         * against the ring's register whitelist. Only valid if flags has the
         * CMD_DESC_REGISTER bit set.
         *
         * A non-zero step value implies that the command may access multiple
         * registers in sequence (e.g. LRI), in that case step gives the
         * distance in dwords between individual offset fields.
         */
        struct {
                u32 offset;
                u32 mask;
                u32 step;
        } reg;

#define MAX_CMD_DESC_BITMASKS 3
        /*
         * Describes command checks where a particular dword is masked and
         * compared against an expected value. If the command does not match
         * the expected value, the parser rejects it. Only valid if flags has
         * the CMD_DESC_BITMASK bit set. Only entries where mask is non-zero
         * are valid.
         *
         * If the check specifies a non-zero condition_mask then the parser
         * only performs the check when the bits specified by condition_mask
         * are non-zero.
         */
        struct {
                u32 offset;
                u32 mask;
                u32 expected;
                u32 condition_offset;
                u32 condition_mask;
        } bits[MAX_CMD_DESC_BITMASKS];
};

/*
 * A table of commands requiring special handling by the command parser.
 *
 * Each ring has an array of tables. Each table consists of an array of command
 * descriptors, which must be sorted with command opcodes in ascending order.
 */
struct drm_i915_cmd_table {
        const struct drm_i915_cmd_descriptor *table;
        int count;
};

/* Note that the (struct drm_i915_private *) cast is just to shut up gcc. */
#define __I915__(p) ({ \
        struct drm_i915_private *__p; \
        if (__builtin_types_compatible_p(typeof(*p), struct drm_i915_private)) \
                __p = (struct drm_i915_private *)p; \
        else if (__builtin_types_compatible_p(typeof(*p), struct drm_device)) \
                __p = to_i915((struct drm_device *)p); \
        else \
                BUILD_BUG(); \
        __p; \
})
#define INTEL_INFO(p)   (&__I915__(p)->info)
#define INTEL_GEN(p)    (INTEL_INFO(p)->gen)
#define INTEL_DEVID(p)  (INTEL_INFO(p)->device_id)

#define REVID_FOREVER           0xff
#define INTEL_REVID(p)  (__I915__(p)->drm.pdev->revision)

#define GEN_FOREVER (0)
/*
 * Returns true if Gen is in inclusive range [Start, End].
 *
 * Use GEN_FOREVER for unbound start and or end.
 */
#define IS_GEN(p, s, e) ({ \
        unsigned int __s = (s), __e = (e); \
        BUILD_BUG_ON(!__builtin_constant_p(s)); \
        BUILD_BUG_ON(!__builtin_constant_p(e)); \
        if ((__s) != GEN_FOREVER) \
                __s = (s) - 1; \
        if ((__e) == GEN_FOREVER) \
                __e = BITS_PER_LONG - 1; \
        else \
                __e = (e) - 1; \
        !!(INTEL_INFO(p)->gen_mask & GENMASK((__e), (__s))); \
})

/*
 * 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_I830(dev)            (INTEL_DEVID(dev) == 0x3577)
#define IS_845G(dev)            (INTEL_DEVID(dev) == 0x2562)
#define IS_I85X(dev)            (INTEL_INFO(dev)->is_i85x)
#define IS_I865G(dev)           (INTEL_DEVID(dev) == 0x2572)
#define IS_I915G(dev)           (INTEL_INFO(dev)->is_i915g)
#define IS_I915GM(dev)          (INTEL_DEVID(dev) == 0x2592)
#define IS_I945G(dev)           (INTEL_DEVID(dev) == 0x2772)
#define IS_I945GM(dev)          (INTEL_INFO(dev)->is_i945gm)
#define IS_BROADWATER(dev)      (INTEL_INFO(dev)->is_broadwater)
#define IS_CRESTLINE(dev)       (INTEL_INFO(dev)->is_crestline)
#define IS_GM45(dev)            (INTEL_DEVID(dev) == 0x2A42)
#define IS_G4X(dev)             (INTEL_INFO(dev)->is_g4x)
#define IS_PINEVIEW_G(dev)      (INTEL_DEVID(dev) == 0xa001)
#define IS_PINEVIEW_M(dev)      (INTEL_DEVID(dev) == 0xa011)
#define IS_PINEVIEW(dev)        (INTEL_INFO(dev)->is_pineview)
#define IS_G33(dev)             (INTEL_INFO(dev)->is_g33)
#define IS_IRONLAKE_M(dev)      (INTEL_DEVID(dev) == 0x0046)
#define IS_IVYBRIDGE(dev)       (INTEL_INFO(dev)->is_ivybridge)
#define IS_IVB_GT1(dev)         (INTEL_DEVID(dev) == 0x0156 || \
                                 INTEL_DEVID(dev) == 0x0152 || \
                                 INTEL_DEVID(dev) == 0x015a)
#define IS_VALLEYVIEW(dev)      (INTEL_INFO(dev)->is_valleyview)
#define IS_CHERRYVIEW(dev)      (INTEL_INFO(dev)->is_cherryview)
#define IS_HASWELL(dev) (INTEL_INFO(dev)->is_haswell)
#define IS_BROADWELL(dev)       (INTEL_INFO(dev)->is_broadwell)
#define IS_SKYLAKE(dev) (INTEL_INFO(dev)->is_skylake)
#define IS_BROXTON(dev)         (INTEL_INFO(dev)->is_broxton)
#define IS_KABYLAKE(dev)        (INTEL_INFO(dev)->is_kabylake)
#define IS_MOBILE(dev)          (INTEL_INFO(dev)->is_mobile)
#define IS_HSW_EARLY_SDV(dev)   (IS_HASWELL(dev) && \
                                 (INTEL_DEVID(dev) & 0xFF00) == 0x0C00)
#define IS_BDW_ULT(dev)         (IS_BROADWELL(dev) && \
                                 ((INTEL_DEVID(dev) & 0xf) == 0x6 ||    \
                                 (INTEL_DEVID(dev) & 0xf) == 0xb ||     \
                                 (INTEL_DEVID(dev) & 0xf) == 0xe))
/* ULX machines are also considered ULT. */
#define IS_BDW_ULX(dev)         (IS_BROADWELL(dev) && \
                                 (INTEL_DEVID(dev) & 0xf) == 0xe)
#define IS_BDW_GT3(dev)         (IS_BROADWELL(dev) && \
                                 (INTEL_DEVID(dev) & 0x00F0) == 0x0020)
#define IS_HSW_ULT(dev)         (IS_HASWELL(dev) && \
                                 (INTEL_DEVID(dev) & 0xFF00) == 0x0A00)
#define IS_HSW_GT3(dev)         (IS_HASWELL(dev) && \
                                 (INTEL_DEVID(dev) & 0x00F0) == 0x0020)
/* ULX machines are also considered ULT. */
#define IS_HSW_ULX(dev)         (INTEL_DEVID(dev) == 0x0A0E || \
                                 INTEL_DEVID(dev) == 0x0A1E)
#define IS_SKL_ULT(dev)         (INTEL_DEVID(dev) == 0x1906 || \
                                 INTEL_DEVID(dev) == 0x1913 || \
                                 INTEL_DEVID(dev) == 0x1916 || \
                                 INTEL_DEVID(dev) == 0x1921 || \
                                 INTEL_DEVID(dev) == 0x1926)
#define IS_SKL_ULX(dev)         (INTEL_DEVID(dev) == 0x190E || \
                                 INTEL_DEVID(dev) == 0x1915 || \
                                 INTEL_DEVID(dev) == 0x191E)
#define IS_KBL_ULT(dev)         (INTEL_DEVID(dev) == 0x5906 || \
                                 INTEL_DEVID(dev) == 0x5913 || \
                                 INTEL_DEVID(dev) == 0x5916 || \
                                 INTEL_DEVID(dev) == 0x5921 || \
                                 INTEL_DEVID(dev) == 0x5926)
#define IS_KBL_ULX(dev)         (INTEL_DEVID(dev) == 0x590E || \
                                 INTEL_DEVID(dev) == 0x5915 || \
                                 INTEL_DEVID(dev) == 0x591E)
#define IS_SKL_GT3(dev)         (IS_SKYLAKE(dev) && \
                                 (INTEL_DEVID(dev) & 0x00F0) == 0x0020)
#define IS_SKL_GT4(dev)         (IS_SKYLAKE(dev) && \
                                 (INTEL_DEVID(dev) & 0x00F0) == 0x0030)

#define IS_PRELIMINARY_HW(intel_info) ((intel_info)->is_preliminary)

#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_C0            0x9

#define IS_BXT_REVID(p, since, until) (IS_BROXTON(p) && IS_REVID(p, 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(p, since, until) \
        (IS_KABYLAKE(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)    (!!(INTEL_INFO(dev)->gen_mask & BIT(1)))
#define IS_GEN3(dev)    (!!(INTEL_INFO(dev)->gen_mask & BIT(2)))
#define IS_GEN4(dev)    (!!(INTEL_INFO(dev)->gen_mask & BIT(3)))
#define IS_GEN5(dev)    (!!(INTEL_INFO(dev)->gen_mask & BIT(4)))
#define IS_GEN6(dev)    (!!(INTEL_INFO(dev)->gen_mask & BIT(5)))
#define IS_GEN7(dev)    (!!(INTEL_INFO(dev)->gen_mask & BIT(6)))
#define IS_GEN8(dev)    (!!(INTEL_INFO(dev)->gen_mask & BIT(7)))
#define IS_GEN9(dev)    (!!(INTEL_INFO(dev)->gen_mask & BIT(8)))

#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) \
        (!!(INTEL_INFO(dev_priv)->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_LLC(dev)            (INTEL_INFO(dev)->has_llc)
#define HAS_SNOOP(dev)          (INTEL_INFO(dev)->has_snoop)
#define HAS_EDRAM(dev)          (!!(__I915__(dev)->edram_cap & EDRAM_ENABLED))
#define HAS_WT(dev)             ((IS_HASWELL(dev) || IS_BROADWELL(dev)) && \
                                 HAS_EDRAM(dev))
#define I915_NEED_GFX_HWS(dev)  (INTEL_INFO(dev)->need_gfx_hws)

#define HAS_HW_CONTEXTS(dev)    (INTEL_INFO(dev)->gen >= 6)
#define HAS_LOGICAL_RING_CONTEXTS(dev)  (INTEL_INFO(dev)->gen >= 8)
#define USES_PPGTT(dev)         (i915.enable_ppgtt)
#define USES_FULL_PPGTT(dev)    (i915.enable_ppgtt >= 2)
#define USES_FULL_48BIT_PPGTT(dev)      (i915.enable_ppgtt == 3)

#define HAS_OVERLAY(dev)                (INTEL_INFO(dev)->has_overlay)
#define OVERLAY_NEEDS_PHYSICAL(dev)     (INTEL_INFO(dev)->overlay_needs_physical)

/* Early gen2 have a totally busted CS tlb and require pinned batches. */
#define HAS_BROKEN_CS_TLB(dev)          (IS_I830(dev) || IS_845G(dev))

/* WaRsDisableCoarsePowerGating:skl,bxt */
#define NEEDS_WaRsDisableCoarsePowerGating(dev_priv) \
        (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1) || \
         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.
 */
#define HAS_AUX_IRQ(dev) (INTEL_INFO(dev)->gen >= 5)
#define HAS_GMBUS_IRQ(dev) (INTEL_INFO(dev)->gen >= 5)

/* 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) (!IS_GEN2(dev) && !(IS_I915G(dev) || \
                                                      IS_I915GM(dev)))
#define SUPPORTS_TV(dev)                (INTEL_INFO(dev)->supports_tv)
#define I915_HAS_HOTPLUG(dev)            (INTEL_INFO(dev)->has_hotplug)

#define HAS_FW_BLC(dev) (INTEL_INFO(dev)->gen > 2)
#define HAS_PIPE_CXSR(dev) (INTEL_INFO(dev)->has_pipe_cxsr)
#define HAS_FBC(dev) (INTEL_INFO(dev)->has_fbc)

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

#define HAS_DP_MST(dev)         (IS_HASWELL(dev) || IS_BROADWELL(dev) || \
                                 INTEL_INFO(dev)->gen >= 9)

#define HAS_DDI(dev)            (INTEL_INFO(dev)->has_ddi)
#define HAS_FPGA_DBG_UNCLAIMED(dev)     (INTEL_INFO(dev)->has_fpga_dbg)
#define HAS_PSR(dev)            (IS_HASWELL(dev) || IS_BROADWELL(dev) || \
                                 IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev) || \
                                 IS_SKYLAKE(dev) || IS_KABYLAKE(dev))
#define HAS_RUNTIME_PM(dev)     (IS_GEN6(dev) || IS_HASWELL(dev) || \
                                 IS_BROADWELL(dev) || IS_VALLEYVIEW(dev) || \
                                 IS_CHERRYVIEW(dev) || IS_SKYLAKE(dev) || \
                                 IS_KABYLAKE(dev) || IS_BROXTON(dev))
#define HAS_RC6(dev)            (INTEL_INFO(dev)->gen >= 6)
#define HAS_RC6p(dev)           (IS_GEN6(dev) || IS_IVYBRIDGE(dev))

#define HAS_CSR(dev)    (IS_GEN9(dev))

/*
 * 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)            (IS_GEN9(dev))
#define HAS_GUC_UCODE(dev)      (HAS_GUC(dev))
#define HAS_GUC_SCHED(dev)      (HAS_GUC(dev))

#define HAS_RESOURCE_STREAMER(dev) (IS_HASWELL(dev) || \
                                    INTEL_INFO(dev)->gen >= 8)

#define HAS_CORE_RING_FREQ(dev) (INTEL_INFO(dev)->gen >= 6 && \
                                 !IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev) && \
                                 !IS_BROXTON(dev))

#define HAS_POOLED_EU(dev)      (INTEL_INFO(dev)->has_pooled_eu)

#define INTEL_PCH_DEVICE_ID_MASK                0xff00
#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_SPT_DEVICE_ID_TYPE            0xA100
#define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE         0x9D00
#define INTEL_PCH_KBP_DEVICE_ID_TYPE            0xA200
#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) (__I915__(dev)->pch_type)
#define HAS_PCH_KBP(dev) (INTEL_PCH_TYPE(dev) == PCH_KBP)
#define HAS_PCH_SPT(dev) (INTEL_PCH_TYPE(dev) == PCH_SPT)
#define HAS_PCH_LPT(dev) (INTEL_PCH_TYPE(dev) == PCH_LPT)
#define HAS_PCH_LPT_LP(dev) (__I915__(dev)->pch_id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE)
#define HAS_PCH_LPT_H(dev) (__I915__(dev)->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE)
#define HAS_PCH_CPT(dev) (INTEL_PCH_TYPE(dev) == PCH_CPT)
#define HAS_PCH_IBX(dev) (INTEL_PCH_TYPE(dev) == PCH_IBX)
#define HAS_PCH_NOP(dev) (INTEL_PCH_TYPE(dev) == PCH_NOP)
#define HAS_PCH_SPLIT(dev) (INTEL_PCH_TYPE(dev) != PCH_NONE)

#define HAS_GMCH_DISPLAY(dev) (INTEL_INFO(dev)->gen < 5 || \
                               IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))

/* DPF == dynamic parity feature */
#define HAS_L3_DPF(dev) (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
#define NUM_L3_SLICES(dev) (IS_HSW_GT3(dev) ? 2 : HAS_L3_DPF(dev))

#define GT_FREQUENCY_MULTIPLIER 50
#define GEN9_FREQ_SCALER 3

#include "i915_trace.h"

static inline bool intel_scanout_needs_vtd_wa(struct drm_i915_private *dev_priv)
{
#ifdef CONFIG_INTEL_IOMMU
        if (INTEL_GEN(dev_priv) >= 6 && intel_iommu_gfx_mapped)
                return true;
#endif
        return false;
}

extern int i915_suspend_switcheroo(struct drm_device *dev, pm_message_t state);
extern int i915_resume_switcheroo(struct drm_device *dev);

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

bool intel_sanitize_semaphores(struct drm_i915_private *dev_priv, int value);

/* 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);
#endif
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);
extern int i915_reset(struct drm_i915_private *dev_priv);
extern int intel_guc_reset(struct drm_i915_private *dev_priv);
extern void intel_engine_init_hangcheck(struct intel_engine_cs *engine);
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);

/* 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);
bool intel_hpd_pin_to_port(enum hpd_pin 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.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);
int intel_irq_install(struct drm_i915_private *dev_priv);
void intel_irq_uninstall(struct drm_i915_private *dev_priv);

extern void intel_uncore_sanitize(struct drm_i915_private *dev_priv);
extern void intel_uncore_early_sanitize(struct drm_i915_private *dev_priv,
                                        bool restore_forcewake);
extern void intel_uncore_init(struct drm_i915_private *dev_priv);
extern bool intel_uncore_unclaimed_mmio(struct drm_i915_private *dev_priv);
extern bool intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv);
extern void intel_uncore_fini(struct drm_i915_private *dev_priv);
extern void intel_uncore_forcewake_reset(struct drm_i915_private *dev_priv,
                                         bool restore);
const char *intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id);
void intel_uncore_forcewake_get(struct drm_i915_private *dev_priv,
                                enum forcewake_domains domains);
void intel_uncore_forcewake_put(struct drm_i915_private *dev_priv,
                                enum forcewake_domains domains);
/* Like above but the caller must manage the uncore.lock itself.
 * Must be used with I915_READ_FW and friends.
 */
void intel_uncore_forcewake_get__locked(struct drm_i915_private *dev_priv,
                                        enum forcewake_domains domains);
void intel_uncore_forcewake_put__locked(struct drm_i915_private *dev_priv,
                                        enum forcewake_domains domains);
u64 intel_uncore_edram_size(struct drm_i915_private *dev_priv);

void assert_forcewakes_inactive(struct drm_i915_private *dev_priv);

int intel_wait_for_register(struct drm_i915_private *dev_priv,
                            i915_reg_t reg,
                            const u32 mask,
                            const u32 value,
                            const unsigned long timeout_ms);
int intel_wait_for_register_fw(struct drm_i915_private *dev_priv,
                               i915_reg_t reg,
                               const u32 mask,
                               const u32 value,
                               const unsigned long timeout_ms);

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

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

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);
void i915_gem_execbuffer_move_to_active(struct list_head *vmas,
                                        struct drm_i915_gem_request *req);
int i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
                                   struct drm_i915_gem_execbuffer2 *args,
                                   struct list_head *vmas);
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(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
int i915_gem_get_tiling(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
void i915_gem_init_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_load_init(struct drm_device *dev);
void i915_gem_load_cleanup(struct drm_device *dev);
void i915_gem_load_init_fences(struct drm_i915_private *dev_priv);
int i915_gem_freeze_late(struct drm_i915_private *dev_priv);

void *i915_gem_object_alloc(struct drm_device *dev);
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_device *dev,
                                                  size_t size);
struct drm_i915_gem_object *i915_gem_object_create_from_data(
                struct drm_device *dev, const void *data, size_t size);
void i915_gem_free_object(struct drm_gem_object *obj);
void i915_gem_vma_destroy(struct i915_vma *vma);

/* Flags used by pin/bind&friends. */
#define PIN_MAPPABLE    (1<<0)
#define PIN_NONBLOCK    (1<<1)
#define PIN_GLOBAL      (1<<2)
#define PIN_OFFSET_BIAS (1<<3)
#define PIN_USER        (1<<4)
#define PIN_UPDATE      (1<<5)
#define PIN_ZONE_4G     (1<<6)
#define PIN_HIGH        (1<<7)
#define PIN_OFFSET_FIXED        (1<<8)
#define PIN_OFFSET_MASK (~4095)
int __must_check
i915_gem_object_pin(struct drm_i915_gem_object *obj,
                    struct i915_address_space *vm,
                    uint32_t alignment,
                    uint64_t flags);
int __must_check
i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
                         const struct i915_ggtt_view *view,
                         uint32_t alignment,
                         uint64_t flags);

int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
                  u32 flags);
void __i915_vma_set_map_and_fenceable(struct i915_vma *vma);
int __must_check i915_vma_unbind(struct i915_vma *vma);
/*
 * BEWARE: Do not use the function below unless you can _absolutely_
 * _guarantee_ VMA in question is _not in use_ anywhere.
 */
int __must_check __i915_vma_unbind_no_wait(struct i915_vma *vma);
int i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
void i915_gem_release_all_mmaps(struct drm_i915_private *dev_priv);
void i915_gem_release_mmap(struct drm_i915_gem_object *obj);

int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
                                    int *needs_clflush);

int __must_check i915_gem_object_get_pages(struct drm_i915_gem_object *obj);

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

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

static inline dma_addr_t
i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj, int n)
{
        if (n < obj->get_page.last) {
                obj->get_page.sg = obj->pages->sgl;
                obj->get_page.last = 0;
        }

        while (obj->get_page.last + __sg_page_count(obj->get_page.sg) <= n) {
                obj->get_page.last += __sg_page_count(obj->get_page.sg++);
                if (unlikely(sg_is_chain(obj->get_page.sg)))
                        obj->get_page.sg = sg_chain_ptr(obj->get_page.sg);
        }

        return sg_dma_address(obj->get_page.sg) + ((n - obj->get_page.last) << PAGE_SHIFT);
}

static inline struct page *
i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n)
{
        if (WARN_ON(n >= obj->base.size >> PAGE_SHIFT))
                return NULL;

        if (n < obj->get_page.last) {
                obj->get_page.sg = obj->pages->sgl;
                obj->get_page.last = 0;
        }

        while (obj->get_page.last + __sg_page_count(obj->get_page.sg) <= n) {
                obj->get_page.last += __sg_page_count(obj->get_page.sg++);
                if (unlikely(sg_is_chain(obj->get_page.sg)))
                        obj->get_page.sg = sg_chain_ptr(obj->get_page.sg);
        }

        return nth_page(sg_page(obj->get_page.sg), n - obj->get_page.last);
}

static inline void i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
{
        BUG_ON(obj->pages == NULL);
        obj->pages_pin_count++;
}

static inline void i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
{
        BUG_ON(obj->pages_pin_count == 0);
        obj->pages_pin_count--;
}

/**
 * i915_gem_object_pin_map - return a contiguous mapping of the entire object
 * @obj - the object to map into kernel address space
 *
 * 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.
 *
 * The caller must hold the struct_mutex, and 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);

/**
 * 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.
 *
 * The caller must hold the struct_mutex.
 */
static inline void i915_gem_object_unpin_map(struct drm_i915_gem_object *obj)
{
        lockdep_assert_held(&obj->base.dev->struct_mutex);
        i915_gem_object_unpin_pages(obj);
}

int __must_check i915_mutex_lock_interruptible(struct drm_device *dev);
int i915_gem_object_sync(struct drm_i915_gem_object *obj,
                         struct intel_engine_cs *to,
                         struct drm_i915_gem_request **to_req);
void i915_vma_move_to_active(struct i915_vma *vma,
                             struct drm_i915_gem_request *req);
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);

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_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);
void i915_gem_retire_requests_ring(struct intel_engine_cs *engine);

static inline u32 i915_reset_counter(struct i915_gpu_error *error)
{
        return atomic_read(&error->reset_counter);
}

static inline bool __i915_reset_in_progress(u32 reset)
{
        return unlikely(reset & I915_RESET_IN_PROGRESS_FLAG);
}

static inline bool __i915_reset_in_progress_or_wedged(u32 reset)
{
        return unlikely(reset & (I915_RESET_IN_PROGRESS_FLAG | I915_WEDGED));
}

static inline bool __i915_terminally_wedged(u32 reset)
{
        return unlikely(reset & I915_WEDGED);
}

static inline bool i915_reset_in_progress(struct i915_gpu_error *error)
{
        return __i915_reset_in_progress(i915_reset_counter(error));
}

static inline bool i915_reset_in_progress_or_wedged(struct i915_gpu_error *error)
{
        return __i915_reset_in_progress_or_wedged(i915_reset_counter(error));
}

static inline bool i915_terminally_wedged(struct i915_gpu_error *error)
{
        return __i915_terminally_wedged(i915_reset_counter(error));
}

static inline u32 i915_reset_count(struct i915_gpu_error *error)
{
        return ((i915_reset_counter(error) & ~I915_WEDGED) + 1) / 2;
}

void i915_gem_reset(struct drm_device *dev);
bool i915_gem_clflush_object(struct drm_i915_gem_object *obj, bool force);
int __must_check i915_gem_init(struct drm_device *dev);
int __must_check i915_gem_init_hw(struct drm_device *dev);
void i915_gem_init_swizzling(struct drm_device *dev);
void i915_gem_cleanup_engines(struct drm_device *dev);
int __must_check i915_gem_wait_for_idle(struct drm_i915_private *dev_priv);
int __must_check i915_gem_suspend(struct drm_device *dev);
void i915_gem_resume(struct drm_device *dev);
int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
int __must_check
i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
                               bool readonly);
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);
int __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 drm_i915_gem_object *obj,
                                              const struct i915_ggtt_view *view);
int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj,
                                int align);
int i915_gem_open(struct drm_device *dev, struct drm_file *file);
void i915_gem_release(struct drm_device *dev, struct drm_file *file);

uint32_t
i915_gem_get_gtt_size(struct drm_device *dev, uint32_t size, int tiling_mode);
uint32_t
i915_gem_get_gtt_alignment(struct drm_device *dev, uint32_t size,
                            int tiling_mode, bool fenced);

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);

u64 i915_gem_obj_ggtt_offset_view(struct drm_i915_gem_object *o,
                                  const struct i915_ggtt_view *view);
u64 i915_gem_obj_offset(struct drm_i915_gem_object *o,
                        struct i915_address_space *vm);
static inline u64
i915_gem_obj_ggtt_offset(struct drm_i915_gem_object *o)
{
        return i915_gem_obj_ggtt_offset_view(o, &i915_ggtt_view_normal);
}

bool i915_gem_obj_bound_any(struct drm_i915_gem_object *o);
bool i915_gem_obj_ggtt_bound_view(struct drm_i915_gem_object *o,
                                  const struct i915_ggtt_view *view);
bool i915_gem_obj_bound(struct drm_i915_gem_object *o,
                        struct i915_address_space *vm);

struct i915_vma *
i915_gem_obj_to_vma(struct drm_i915_gem_object *obj,
                    struct i915_address_space *vm);
struct i915_vma *
i915_gem_obj_to_ggtt_view(struct drm_i915_gem_object *obj,
                          const struct i915_ggtt_view *view);

struct i915_vma *
i915_gem_obj_lookup_or_create_vma(struct drm_i915_gem_object *obj,
                                  struct i915_address_space *vm);
struct i915_vma *
i915_gem_obj_lookup_or_create_ggtt_vma(struct drm_i915_gem_object *obj,
                                       const struct i915_ggtt_view *view);

static inline struct i915_vma *
i915_gem_obj_to_ggtt(struct drm_i915_gem_object *obj)
{
        return i915_gem_obj_to_ggtt_view(obj, &i915_ggtt_view_normal);
}
bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj);

/* Some GGTT VM helpers */
static inline struct i915_hw_ppgtt *
i915_vm_to_ppgtt(struct i915_address_space *vm)
{
        return container_of(vm, struct i915_hw_ppgtt, base);
}


static inline bool i915_gem_obj_ggtt_bound(struct drm_i915_gem_object *obj)
{
        return i915_gem_obj_ggtt_bound_view(obj, &i915_ggtt_view_normal);
}

unsigned long
i915_gem_obj_ggtt_size(struct drm_i915_gem_object *obj);

static inline int __must_check
i915_gem_obj_ggtt_pin(struct drm_i915_gem_object *obj,
                      uint32_t alignment,
                      unsigned flags)
{
        struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
        struct i915_ggtt *ggtt = &dev_priv->ggtt;

        return i915_gem_object_pin(obj, &ggtt->base,
                                   alignment, flags | PIN_GLOBAL);
}

void i915_gem_object_ggtt_unpin_view(struct drm_i915_gem_object *obj,
                                     const struct i915_ggtt_view *view);
static inline void
i915_gem_object_ggtt_unpin(struct drm_i915_gem_object *obj)
{
        i915_gem_object_ggtt_unpin_view(obj, &i915_ggtt_view_normal);
}

/* i915_gem_fence.c */
int __must_check i915_gem_object_get_fence(struct drm_i915_gem_object *obj);
int __must_check i915_gem_object_put_fence(struct drm_i915_gem_object *obj);

bool i915_gem_object_pin_fence(struct drm_i915_gem_object *obj);
void i915_gem_object_unpin_fence(struct drm_i915_gem_object *obj);

void i915_gem_restore_fences(struct drm_device *dev);

void i915_gem_detect_bit_6_swizzle(struct drm_device *dev);
void i915_gem_object_do_bit_17_swizzle(struct drm_i915_gem_object *obj);
void i915_gem_object_save_bit_17_swizzle(struct drm_i915_gem_object *obj);

/* i915_gem_context.c */
int __must_check i915_gem_context_init(struct drm_device *dev);
void i915_gem_context_lost(struct drm_i915_private *dev_priv);
void i915_gem_context_fini(struct drm_device *dev);
void i915_gem_context_reset(struct drm_device *dev);
int i915_gem_context_open(struct drm_device *dev, struct drm_file *file);
void i915_gem_context_close(struct drm_device *dev, struct drm_file *file);
int i915_switch_context(struct drm_i915_gem_request *req);
int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv);
void i915_gem_context_free(struct kref *ctx_ref);
struct drm_i915_gem_object *
i915_gem_alloc_context_obj(struct drm_device *dev, size_t size);
struct i915_gem_context *
i915_gem_context_create_gvt(struct drm_device *dev);

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

        lockdep_assert_held(&file_priv->dev_priv->drm.struct_mutex);

        ctx = idr_find(&file_priv->context_idr, id);
        if (!ctx)
                return ERR_PTR(-ENOENT);

        return ctx;
}

static inline struct i915_gem_context *
i915_gem_context_get(struct i915_gem_context *ctx)
{
        kref_get(&ctx->ref);
        return ctx;
}

static inline void i915_gem_context_put(struct i915_gem_context *ctx)
{
        lockdep_assert_held(&ctx->i915->drm.struct_mutex);
        kref_put(&ctx->ref, i915_gem_context_free);
}

static inline bool i915_gem_context_is_default(const struct i915_gem_context *c)
{
        return c->user_handle == DEFAULT_CONTEXT_HANDLE;
}

int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
                                  struct drm_file *file);
int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
                                   struct drm_file *file);
int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
                                    struct drm_file *file_priv);
int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
                                    struct drm_file *file_priv);
int i915_gem_context_reset_stats_ioctl(struct drm_device *dev, void *data,
                                       struct drm_file *file);

/* i915_gem_evict.c */
int __must_check i915_gem_evict_something(struct drm_device *dev,
                                          struct i915_address_space *vm,
                                          int min_size,
                                          unsigned alignment,
                                          unsigned cache_level,
                                          unsigned long start,
                                          unsigned long end,
                                          unsigned flags);
int __must_check i915_gem_evict_for_vma(struct i915_vma *target);
int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle);

/* belongs in i915_gem_gtt.h */
static inline void i915_gem_chipset_flush(struct drm_i915_private *dev_priv)
{
        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_device *dev);
void i915_gem_cleanup_stolen(struct drm_device *dev);
struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_device *dev, u32 size);
struct drm_i915_gem_object *
i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
                                               u32 stolen_offset,
                                               u32 gtt_offset,
                                               u32 size);

/* i915_gem_shrinker.c */
unsigned long i915_gem_shrink(struct drm_i915_private *dev_priv,
                              unsigned long target,
                              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 *dev_priv);
void i915_gem_shrinker_init(struct drm_i915_private *dev_priv);
void i915_gem_shrinker_cleanup(struct drm_i915_private *dev_priv);


/* 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 &&
                obj->tiling_mode != I915_TILING_NONE;
}

/* i915_gem_debug.c */
#if WATCH_LISTS
int i915_verify_lists(struct drm_device *dev);
#else
#define i915_verify_lists(dev) 0
#endif

/* i915_debugfs.c */
#ifdef CONFIG_DEBUG_FS
int i915_debugfs_register(struct drm_i915_private *dev_priv);
void i915_debugfs_unregister(struct drm_i915_private *dev_priv);
int i915_debugfs_connector_add(struct drm_connector *connector);
void intel_display_crc_init(struct drm_device *dev);
#else
static inline int i915_debugfs_register(struct drm_i915_private *dev_priv) {return 0;}
static inline void i915_debugfs_unregister(struct drm_i915_private *dev_priv) {}
static inline int i915_debugfs_connector_add(struct drm_connector *connector)
{ return 0; }
static inline void intel_display_crc_init(struct drm_device *dev) {}
#endif

/* i915_gpu_error.c */
__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_error_state_file_priv *error);
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);
}
void i915_capture_error_state(struct drm_i915_private *dev_priv,
                              u32 engine_mask,
                              const char *error_msg);
void i915_error_state_get(struct drm_device *dev,
                          struct i915_error_state_file_priv *error_priv);
void i915_error_state_put(struct i915_error_state_file_priv *error_priv);
void i915_destroy_error_state(struct drm_device *dev);

void i915_get_extra_instdone(struct drm_i915_private *dev_priv, uint32_t *instdone);
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);
int i915_cmd_parser_init_ring(struct intel_engine_cs *engine);
void i915_cmd_parser_fini_ring(struct intel_engine_cs *engine);
bool i915_needs_cmd_parser(struct intel_engine_cs *engine);
int i915_parse_cmds(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_suspend.c */
extern int i915_save_state(struct drm_device *dev);
extern int i915_restore_state(struct drm_device *dev);

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

/* intel_i2c.c */
extern int intel_setup_gmbus(struct drm_device *dev);
extern void intel_teardown_gmbus(struct drm_device *dev);
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_device *dev);

/* intel_bios.c */
int intel_bios_init(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);

/* intel_opregion.c */
#ifdef CONFIG_ACPI
extern int intel_opregion_setup(struct drm_i915_private *dev_priv);
extern void intel_opregion_register(struct drm_i915_private *dev_priv);
extern void intel_opregion_unregister(struct drm_i915_private *dev_priv);
extern void intel_opregion_asle_intr(struct drm_i915_private *dev_priv);
extern int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
                                         bool enable);
extern int intel_opregion_notify_adapter(struct drm_i915_private *dev_priv,
                                         pci_power_t state);
extern int intel_opregion_get_panel_type(struct drm_i915_private *dev_priv);
#else
static inline int intel_opregion_setup(struct drm_i915_private *dev) { return 0; }
static inline void intel_opregion_register(struct drm_i915_private *dev_priv) { }
static inline void intel_opregion_unregister(struct drm_i915_private *dev_priv) { }
static inline void intel_opregion_asle_intr(struct drm_i915_private *dev_priv)
{
}
static inline int
intel_opregion_notify_encoder(struct intel_encoder *intel_encoder, bool enable)
{
        return 0;
}
static inline int
intel_opregion_notify_adapter(struct drm_i915_private *dev, pci_power_t state)
{
        return 0;
}
static inline int intel_opregion_get_panel_type(struct drm_i915_private *dev)
{
        return -ENODEV;
}
#endif

/* 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;
}

void intel_device_info_runtime_init(struct drm_i915_private *dev_priv);
void intel_device_info_dump(struct drm_i915_private *dev_priv);

/* modesetting */
extern void intel_modeset_init_hw(struct drm_device *dev);
extern void intel_modeset_init(struct drm_device *dev);
extern void intel_modeset_gem_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_device *dev, bool state);
extern void intel_display_resume(struct drm_device *dev);
extern void i915_redisable_vga(struct drm_device *dev);
extern void i915_redisable_vga_power_on(struct drm_device *dev);
extern bool ironlake_set_drps(struct drm_i915_private *dev_priv, u8 val);
extern void intel_init_pch_refclk(struct drm_device *dev);
extern void intel_set_rps(struct drm_i915_private *dev_priv, u8 val);
extern void 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 drm_device *dev,
                                            struct intel_display_error_state *error);

int sandybridge_pcode_read(struct drm_i915_private *dev_priv, u32 mbox, u32 *val);
int sandybridge_pcode_write(struct drm_i915_private *dev_priv, u32 mbox, u32 val);

/* intel_sideband.c */
u32 vlv_punit_read(struct drm_i915_private *dev_priv, u32 addr);
void 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 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,
                              bool reset);
void chv_phy_pre_pll_enable(struct intel_encoder *encoder);
void chv_phy_pre_encoder_enable(struct intel_encoder *encoder);
void chv_phy_release_cl2_override(struct intel_encoder *encoder);
void chv_phy_post_pll_disable(struct intel_encoder *encoder);

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);
void vlv_phy_pre_encoder_enable(struct intel_encoder *encoder);
void vlv_phy_reset_lanes(struct intel_encoder *encoder);

int intel_gpu_freq(struct drm_i915_private *dev_priv, int val);
int intel_freq_opcode(struct drm_i915_private *dev_priv, int val);

#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. You have been warned.
 */
#define I915_WRITE64(reg, val)  dev_priv->uncore.funcs.mmio_writeq(dev_priv, (reg), (val), true)
#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(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(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
 * criticial sections inside IRQ handlers where forcewake is explicitly
 * controlled.
 * Think twice, and think again, before using these.
 * Note: Should only be used between intel_uncore_forcewake_irqlock() and
 * intel_uncore_forcewake_irqunlock().
 */
#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_device *dev)
{
        if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
                return VLV_VGACNTRL;
        else if (INTEL_INFO(dev)->gen >= 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)
{
        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(struct drm_i915_gem_request *req)
{
        struct intel_engine_cs *engine = req->engine;

        /* Before we do the heavier coherent read of the seqno,
         * check the value (hopefully) in the CPU cacheline.
         */
        if (i915_gem_request_completed(req))
                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 &&
            READ_ONCE(engine->breadcrumbs.irq_seqno_bh) == current &&
            cmpxchg_relaxed(&engine->breadcrumbs.irq_posted, 1, 0)) {
                struct task_struct *tsk;

                /* 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).
                 */
                rcu_read_lock();
                tsk = READ_ONCE(engine->breadcrumbs.irq_seqno_bh);
                if (tsk && 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(tsk);
                rcu_read_unlock();

                if (i915_gem_request_completed(req))
                        return true;
        }

        /* We need to check whether any gpu reset happened in between
         * the request being submitted and now. If a reset has occurred,
         * the seqno will have been advance past ours and our request
         * is complete. If we are in the process of handling a reset,
         * the request is effectively complete as the rendering will
         * be discarded, but we need to return in order to drop the
         * struct_mutex.
         */
        if (i915_reset_in_progress(&req->i915->gpu_error))
                return true;

        return false;
}

#endif