drm/i915: Modifying structures related to DRRS

[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 "i915_reg.h"
#include "intel_bios.h"
#include "intel_ringbuffer.h"
#include "intel_lrc.h"
#include "i915_gem_gtt.h"
#include "i915_gem_render_state.h"
#include <linux/io-mapping.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <drm/intel-gtt.h>
#include <drm/drm_legacy.h> /* for struct drm_dma_handle */
#include <drm/drm_gem.h>
#include <linux/backlight.h>
#include <linux/hashtable.h>
#include <linux/intel-iommu.h>
#include <linux/kref.h>
#include <linux/pm_qos.h>

/* General customization:
 */

#define DRIVER_NAME             "i915"
#define DRIVER_DESC             "Intel Graphics"
#define DRIVER_DATE             "20150117"

#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), "WARN_ON(" #x ")")
#endif

#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 (i915.verbose_state_checks)                          \
                        WARN(1, format);                                \
                else                                                    \
                        DRM_ERROR(format);                              \
        }                                                               \
        unlikely(__ret_warn_on);                                        \
})

#define I915_STATE_WARN_ON(condition) ({                                \
        int __ret_warn_on = !!(condition);                              \
        if (unlikely(__ret_warn_on)) {                                  \
                if (i915.verbose_state_checks)                          \
                        WARN(1, "WARN_ON(" #condition ")\n");           \
                else                                                    \
                        DRM_ERROR("WARN_ON(" #condition ")\n");         \
        }                                                               \
        unlikely(__ret_warn_on);                                        \
})

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,
        I915_MAX_TRANSCODERS
};
#define transcoder_name(t) ((t) + 'A')

/*
 * This is the maximum (across all platforms) number of planes (primary +
 * sprites) that can be active at the same time on one pipe.
 *
 * This value doesn't count the cursor plane.
 */
#define I915_MAX_PLANES 3

enum plane {
        PLANE_A = 0,
        PLANE_B,
        PLANE_C,
};
#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_PORT_DDI_A_2_LANES,
        POWER_DOMAIN_PORT_DDI_A_4_LANES,
        POWER_DOMAIN_PORT_DDI_B_2_LANES,
        POWER_DOMAIN_PORT_DDI_B_4_LANES,
        POWER_DOMAIN_PORT_DDI_C_2_LANES,
        POWER_DOMAIN_PORT_DDI_C_4_LANES,
        POWER_DOMAIN_PORT_DDI_D_2_LANES,
        POWER_DOMAIN_PORT_DDI_D_4_LANES,
        POWER_DOMAIN_PORT_DSI,
        POWER_DOMAIN_PORT_CRT,
        POWER_DOMAIN_PORT_OTHER,
        POWER_DOMAIN_VGA,
        POWER_DOMAIN_AUDIO,
        POWER_DOMAIN_PLLS,
        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_PORT_A = HPD_NONE, /* PORT_A is internal */
        HPD_TV = HPD_NONE,     /* TV is known to be unreliable */
        HPD_CRT,
        HPD_SDVO_B,
        HPD_SDVO_C,
        HPD_PORT_B,
        HPD_PORT_C,
        HPD_PORT_D,
        HPD_NUM_PINS
};

#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_plane(pipe, p) \
        for ((p) = 0; (p) < INTEL_INFO(dev)->num_sprites[(pipe)] + 1; (p)++)
#define for_each_sprite(p, s) for ((s) = 0; (s) < INTEL_INFO(dev)->num_sprites[(p)]; (s)++)

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

#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_encoder(dev, intel_encoder)              \
        list_for_each_entry(intel_encoder,                      \
                            &(dev)->mode_config.encoder_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) \
                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) \
                if ((intel_connector)->base.encoder == (__encoder))

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

struct drm_i915_private;
struct i915_mm_struct;
struct i915_mmu_object;

enum intel_dpll_id {
        DPLL_ID_PRIVATE = -1, /* non-shared dpll in use */
        /* real shared dpll ids must be >= 0 */
        DPLL_ID_PCH_PLL_A = 0,
        DPLL_ID_PCH_PLL_B = 1,
        /* hsw/bdw */
        DPLL_ID_WRPLL1 = 0,
        DPLL_ID_WRPLL2 = 1,
        /* skl */
        DPLL_ID_SKL_DPLL1 = 0,
        DPLL_ID_SKL_DPLL2 = 1,
        DPLL_ID_SKL_DPLL3 = 2,
};
#define I915_NUM_PLLS 3

struct intel_dpll_hw_state {
        /* i9xx, pch plls */
        uint32_t dpll;
        uint32_t dpll_md;
        uint32_t fp0;
        uint32_t fp1;

        /* hsw, bdw */
        uint32_t wrpll;

        /* skl */
        /*
         * DPLL_CTRL1 has 6 bits for each each this DPLL. We store those in
         * lower part of crtl1 and they get shifted into position when writing
         * the register.  This allows us to easily compare the state to share
         * the DPLL.
         */
        uint32_t ctrl1;
        /* HDMI only, 0 when used for DP */
        uint32_t cfgcr1, cfgcr2;
};

struct intel_shared_dpll_config {
        unsigned crtc_mask; /* mask of CRTCs sharing this PLL */
        struct intel_dpll_hw_state hw_state;
};

struct intel_shared_dpll {
        struct intel_shared_dpll_config config;
        struct intel_shared_dpll_config *new_config;

        int active; /* count of number of active CRTCs (i.e. DPMS on) */
        bool on; /* is the PLL actually active? Disabled during modeset */
        const char *name;
        /* should match the index in the dev_priv->shared_dplls array */
        enum intel_dpll_id id;
        /* The mode_set hook is optional and should be used together with the
         * intel_prepare_shared_dpll function. */
        void (*mode_set)(struct drm_i915_private *dev_priv,
                         struct intel_shared_dpll *pll);
        void (*enable)(struct drm_i915_private *dev_priv,
                       struct intel_shared_dpll *pll);
        void (*disable)(struct drm_i915_private *dev_priv,
                        struct intel_shared_dpll *pll);
        bool (*get_hw_state)(struct drm_i915_private *dev_priv,
                             struct intel_shared_dpll *pll,
                             struct intel_dpll_hw_state *hw_state);
};

#define SKL_DPLL0 0
#define SKL_DPLL1 1
#define SKL_DPLL2 2
#define SKL_DPLL3 3

/* 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 __iomem *header;
        struct opregion_acpi __iomem *acpi;
        struct opregion_swsci __iomem *swsci;
        u32 swsci_gbda_sub_functions;
        u32 swsci_sbcb_sub_functions;
        struct opregion_asle __iomem *asle;
        void __iomem *vbt;
        u32 __iomem *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];
        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 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 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 semaphore_seqno[I915_NUM_RINGS - 1];

                /* Register state */
                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_RINGS - 1];

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

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

                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_RINGS];

        struct drm_i915_error_buffer {
                u32 size;
                u32 name;
                u32 rseqno, wseqno;
                u32 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_config;
struct intel_plane_config;
struct intel_crtc;
struct intel_limit;
struct dpll;

struct drm_i915_display_funcs {
        bool (*fbc_enabled)(struct drm_device *dev);
        void (*enable_fbc)(struct drm_crtc *crtc);
        void (*disable_fbc)(struct drm_device *dev);
        int (*get_display_clock_speed)(struct drm_device *dev);
        int (*get_fifo_size)(struct drm_device *dev, int plane);
        /**
         * find_dpll() - Find the best values for the PLL
         * @limit: limits for the PLL
         * @crtc: current CRTC
         * @target: target frequency in kHz
         * @refclk: reference clock frequency in kHz
         * @match_clock: if provided, @best_clock P divider must
         *               match the P divider from @match_clock
         *               used for LVDS downclocking
         * @best_clock: best PLL values found
         *
         * Returns true on success, false on failure.
         */
        bool (*find_dpll)(const struct intel_limit *limit,
                          struct intel_crtc *crtc,
                          int target, int refclk,
                          struct dpll *match_clock,
                          struct dpll *best_clock);
        void (*update_wm)(struct drm_crtc *crtc);
        void (*update_sprite_wm)(struct drm_plane *plane,
                                 struct drm_crtc *crtc,
                                 uint32_t sprite_width, uint32_t sprite_height,
                                 int pixel_size, bool enable, bool scaled);
        void (*modeset_global_resources)(struct drm_device *dev);
        /* 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_config *);
        void (*get_plane_config)(struct intel_crtc *,
                                 struct intel_plane_config *);
        int (*crtc_compute_clock)(struct intel_crtc *crtc);
        void (*crtc_enable)(struct drm_crtc *crtc);
        void (*crtc_disable)(struct drm_crtc *crtc);
        void (*off)(struct drm_crtc *crtc);
        void (*audio_codec_enable)(struct drm_connector *connector,
                                   struct intel_encoder *encoder,
                                   struct drm_display_mode *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 intel_engine_cs *ring,
                          uint32_t flags);
        void (*update_primary_plane)(struct drm_crtc *crtc,
                                     struct drm_framebuffer *fb,
                                     int x, int y);
        void (*hpd_irq_setup)(struct drm_device *dev);
        /* clock updates for mode set */
        /* cursor updates */
        /* render clock increase/decrease */
        /* display clock increase/decrease */
        /* pll clock increase/decrease */

        int (*setup_backlight)(struct intel_connector *connector, enum pipe pipe);
        uint32_t (*get_backlight)(struct intel_connector *connector);
        void (*set_backlight)(struct intel_connector *connector,
                              uint32_t level);
        void (*disable_backlight)(struct intel_connector *connector);
        void (*enable_backlight)(struct intel_connector *connector);
};

struct intel_uncore_funcs {
        void (*force_wake_get)(struct drm_i915_private *dev_priv,
                                                        int fw_engine);
        void (*force_wake_put)(struct drm_i915_private *dev_priv,
                                                        int fw_engine);

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

        void (*mmio_writeb)(struct drm_i915_private *dev_priv, off_t offset,
                                uint8_t val, bool trace);
        void (*mmio_writew)(struct drm_i915_private *dev_priv, off_t offset,
                                uint16_t val, bool trace);
        void (*mmio_writel)(struct drm_i915_private *dev_priv, off_t offset,
                                uint32_t val, bool trace);
        void (*mmio_writeq)(struct drm_i915_private *dev_priv, off_t offset,
                                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;
        unsigned forcewake_count;

        unsigned fw_rendercount;
        unsigned fw_mediacount;
        unsigned fw_blittercount;

        struct timer_list force_wake_timer;
};

#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_haswell) sep \
        func(is_skylake) 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_ddi) sep \
        func(has_fpga_dbg)

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

struct intel_device_info {
        u32 display_mmio_offset;
        u16 device_id;
        u8 num_pipes:3;
        u8 num_sprites[I915_MAX_PIPES];
        u8 gen;
        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];
        unsigned int eu_total;
};

#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 intel_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.
 * @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.
 * @vm: 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 intel_context {
        struct kref ref;
        int user_handle;
        uint8_t remap_slice;
        struct drm_i915_file_private *file_priv;
        struct i915_ctx_hang_stats hang_stats;
        struct i915_hw_ppgtt *ppgtt;

        /* Legacy ring buffer submission */
        struct {
                struct drm_i915_gem_object *rcs_state;
                bool initialized;
        } legacy_hw_ctx;

        /* Execlists */
        bool rcs_initialized;
        struct {
                struct drm_i915_gem_object *state;
                struct intel_ringbuffer *ringbuf;
                int unpin_count;
        } engine[I915_NUM_RINGS];

        struct list_head link;
};

struct i915_fbc {
        unsigned long size;
        unsigned threshold;
        unsigned int fb_id;
        enum plane plane;
        int y;

        struct drm_mm_node compressed_fb;
        struct drm_mm_node *compressed_llb;

        bool false_color;

        /* Tracks whether the HW is actually enabled, not whether the feature is
         * possible. */
        bool enabled;

        /* On gen8 some rings cannont perform fbc clean operation so for now
         * we are doing this on SW with mmio.
         * This variable works in the opposite information direction
         * of ring->fbc_dirty telling software on frontbuffer tracking
         * to perform the cache clean on sw side.
         */
        bool need_sw_cache_clean;

        struct intel_fbc_work {
                struct delayed_work work;
                struct drm_crtc *crtc;
                struct drm_framebuffer *fb;
        } *fbc_work;

        enum no_fbc_reason {
                FBC_OK, /* FBC is enabled */
                FBC_UNSUPPORTED, /* FBC is not supported by this chipset */
                FBC_NO_OUTPUT, /* no outputs enabled to compress */
                FBC_STOLEN_TOO_SMALL, /* not enough space for buffers */
                FBC_UNSUPPORTED_MODE, /* interlace or doublescanned mode */
                FBC_MODE_TOO_LARGE, /* mode too large for compression */
                FBC_BAD_PLANE, /* fbc not supported on plane */
                FBC_NOT_TILED, /* buffer not tiled */
                FBC_MULTIPLE_PIPES, /* more than one pipe active */
                FBC_MODULE_PARAM,
                FBC_CHIP_DEFAULT, /* disabled by default on this chip */
        } 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 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_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;
        u32 force_bit;
        u32 reg0;
        u32 gpio_reg;
        struct i2c_algo_bit_data bit_algo;
        struct drm_i915_private *dev_priv;
};

struct i915_suspend_saved_registers {
        u8 saveLBB;
        u32 saveDSPACNTR;
        u32 saveDSPBCNTR;
        u32 saveDSPARB;
        u32 savePIPEACONF;
        u32 savePIPEBCONF;
        u32 savePIPEASRC;
        u32 savePIPEBSRC;
        u32 saveFPA0;
        u32 saveFPA1;
        u32 saveDPLL_A;
        u32 saveDPLL_A_MD;
        u32 saveHTOTAL_A;
        u32 saveHBLANK_A;
        u32 saveHSYNC_A;
        u32 saveVTOTAL_A;
        u32 saveVBLANK_A;
        u32 saveVSYNC_A;
        u32 saveBCLRPAT_A;
        u32 saveTRANSACONF;
        u32 saveTRANS_HTOTAL_A;
        u32 saveTRANS_HBLANK_A;
        u32 saveTRANS_HSYNC_A;
        u32 saveTRANS_VTOTAL_A;
        u32 saveTRANS_VBLANK_A;
        u32 saveTRANS_VSYNC_A;
        u32 savePIPEASTAT;
        u32 saveDSPASTRIDE;
        u32 saveDSPASIZE;
        u32 saveDSPAPOS;
        u32 saveDSPAADDR;
        u32 saveDSPASURF;
        u32 saveDSPATILEOFF;
        u32 savePFIT_PGM_RATIOS;
        u32 saveBLC_HIST_CTL;
        u32 saveBLC_PWM_CTL;
        u32 saveBLC_PWM_CTL2;
        u32 saveBLC_CPU_PWM_CTL;
        u32 saveBLC_CPU_PWM_CTL2;
        u32 saveFPB0;
        u32 saveFPB1;
        u32 saveDPLL_B;
        u32 saveDPLL_B_MD;
        u32 saveHTOTAL_B;
        u32 saveHBLANK_B;
        u32 saveHSYNC_B;
        u32 saveVTOTAL_B;
        u32 saveVBLANK_B;
        u32 saveVSYNC_B;
        u32 saveBCLRPAT_B;
        u32 saveTRANSBCONF;
        u32 saveTRANS_HTOTAL_B;
        u32 saveTRANS_HBLANK_B;
        u32 saveTRANS_HSYNC_B;
        u32 saveTRANS_VTOTAL_B;
        u32 saveTRANS_VBLANK_B;
        u32 saveTRANS_VSYNC_B;
        u32 savePIPEBSTAT;
        u32 saveDSPBSTRIDE;
        u32 saveDSPBSIZE;
        u32 saveDSPBPOS;
        u32 saveDSPBADDR;
        u32 saveDSPBSURF;
        u32 saveDSPBTILEOFF;
        u32 saveVGA0;
        u32 saveVGA1;
        u32 saveVGA_PD;
        u32 saveVGACNTRL;
        u32 saveADPA;
        u32 saveLVDS;
        u32 savePP_ON_DELAYS;
        u32 savePP_OFF_DELAYS;
        u32 saveDVOA;
        u32 saveDVOB;
        u32 saveDVOC;
        u32 savePP_ON;
        u32 savePP_OFF;
        u32 savePP_CONTROL;
        u32 savePP_DIVISOR;
        u32 savePFIT_CONTROL;
        u32 save_palette_a[256];
        u32 save_palette_b[256];
        u32 saveFBC_CONTROL;
        u32 saveIER;
        u32 saveIIR;
        u32 saveIMR;
        u32 saveDEIER;
        u32 saveDEIMR;
        u32 saveGTIER;
        u32 saveGTIMR;
        u32 saveFDI_RXA_IMR;
        u32 saveFDI_RXB_IMR;
        u32 saveCACHE_MODE_0;
        u32 saveMI_ARB_STATE;
        u32 saveSWF0[16];
        u32 saveSWF1[16];
        u32 saveSWF2[3];
        u8 saveMSR;
        u8 saveSR[8];
        u8 saveGR[25];
        u8 saveAR_INDEX;
        u8 saveAR[21];
        u8 saveDACMASK;
        u8 saveCR[37];
        uint64_t saveFENCE[I915_MAX_NUM_FENCES];
        u32 saveCURACNTR;
        u32 saveCURAPOS;
        u32 saveCURABASE;
        u32 saveCURBCNTR;
        u32 saveCURBPOS;
        u32 saveCURBBASE;
        u32 saveCURSIZE;
        u32 saveDP_B;
        u32 saveDP_C;
        u32 saveDP_D;
        u32 savePIPEA_GMCH_DATA_M;
        u32 savePIPEB_GMCH_DATA_M;
        u32 savePIPEA_GMCH_DATA_N;
        u32 savePIPEB_GMCH_DATA_N;
        u32 savePIPEA_DP_LINK_M;
        u32 savePIPEB_DP_LINK_M;
        u32 savePIPEA_DP_LINK_N;
        u32 savePIPEB_DP_LINK_N;
        u32 saveFDI_RXA_CTL;
        u32 saveFDI_TXA_CTL;
        u32 saveFDI_RXB_CTL;
        u32 saveFDI_TXB_CTL;
        u32 savePFA_CTL_1;
        u32 savePFB_CTL_1;
        u32 savePFA_WIN_SZ;
        u32 savePFB_WIN_SZ;
        u32 savePFA_WIN_POS;
        u32 savePFB_WIN_POS;
        u32 savePCH_DREF_CONTROL;
        u32 saveDISP_ARB_CTL;
        u32 savePIPEA_DATA_M1;
        u32 savePIPEA_DATA_N1;
        u32 savePIPEA_LINK_M1;
        u32 savePIPEA_LINK_N1;
        u32 savePIPEB_DATA_M1;
        u32 savePIPEB_DATA_N1;
        u32 savePIPEB_LINK_M1;
        u32 savePIPEB_LINK_N1;
        u32 saveMCHBAR_RENDER_STANDBY;
        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 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;

        /* 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 efficient_freq;      /* AKA RPe. Pre-determined balanced frequency */
        u8 rp1_freq;            /* "less than" RP0 power/freqency */
        u8 rp0_freq;            /* Non-overclocked max frequency. */
        u32 cz_freq;

        u32 ei_interrupt_count;

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

        bool enabled;
        struct delayed_work delayed_resume_work;

        /* 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.
         */
        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_gem_object *pwrctx;
        struct drm_i915_gem_object *renderctx;
};

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_batch_pool {
        struct drm_device *dev;
        struct list_head cache_list;
};

struct i915_gem_mm {
        /** Memory allocator for GTT stolen memory */
        struct drm_mm stolen;
        /** 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;

        /*
         * A pool of objects to use as shadow copies of client batch buffers
         * when the command parser is enabled. Prevents the client from
         * modifying the batch contents after software parsing.
         */
        struct i915_gem_batch_pool batch_pool;

        /** 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 shrinker shrinker;
        bool shrinker_no_lock_stealing;

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

        /**
         * 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;

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

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

        /* the indicator for dispatch video commands on two BSD rings */
        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 timer_list hangcheck_timer;

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


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

        /* Userspace knobs for gpu hang simulation;
         * combines both a ring mask, and extra flags
         */
        u32 stop_rings;
#define I915_STOP_RING_ALLOW_BAN       (1 << 31)
#define I915_STOP_RING_ALLOW_WARN      (1 << 30)

        /* For missed irq/seqno simulation. */
        unsigned int test_irq_rings;

        /* Used to prevent gem_check_wedged returning -EAGAIN during gpu reset   */
        bool reload_in_reset;
};

enum modeset_restore {
        MODESET_ON_LID_OPEN,
        MODESET_DONE,
        MODESET_SUSPENDED,
};

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;
};

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 has_mipi:1;
        int lvds_ssc_freq;
        unsigned int bios_lvds_val; /* initial [PCH_]LVDS reg val in VBIOS */

        enum drrs_support_type drrs_type;

        /* eDP */
        int edp_rate;
        int edp_lanes;
        int edp_preemphasis;
        int edp_vswing;
        bool edp_initialized;
        bool edp_support;
        int edp_bpp;
        struct edp_power_seq edp_pps;

        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 */
        } backlight;

        /* MIPI DSI */
        struct {
                u16 port;
                u16 panel_id;
                struct mipi_config *config;
                struct mipi_pps_data *pps;
                u8 seq_version;
                u32 size;
                u8 *data;
                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];
};

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 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];
        struct skl_ddb_entry cursor[I915_MAX_PIPES];
};

struct skl_wm_values {
        bool dirty[I915_MAX_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 cursor[I915_MAX_PIPES][8];
        uint32_t plane_trans[I915_MAX_PIPES][I915_MAX_PLANES];
        uint32_t cursor_trans[I915_MAX_PIPES];
};

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

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

#define I915_MAX_WA_REGS 16

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

struct drm_i915_private {
        struct drm_device *dev;
        struct kmem_cache *slab;

        const struct intel_device_info info;

        int relative_constants_mode;

        void __iomem *regs;

        struct intel_uncore uncore;

        struct intel_gmbus gmbus[GMBUS_NUM_PORTS];


        /** 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;

        wait_queue_head_t gmbus_wait_queue;

        struct pci_dev *bridge_dev;
        struct intel_engine_cs ring[I915_NUM_RINGS];
        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;

        /* DPIO indirect register protection */
        struct mutex dpio_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 work_struct hotplug_work;
        struct {
                unsigned long hpd_last_jiffies;
                int hpd_cnt;
                enum {
                        HPD_ENABLED = 0,
                        HPD_DISABLED = 1,
                        HPD_MARK_DISABLED = 2
                } hpd_mark;
        } hpd_stats[HPD_NUM_PINS];
        u32 hpd_event_bits;
        struct delayed_work hotplug_reenable_work;

        struct i915_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 fence_reg_start; /* 4 if userland hasn't ioctl'd us yet */
        int num_fence_regs; /* 8 on pre-965, 16 otherwise */

        unsigned int fsb_freq, mem_freq, is_ddr3;
        unsigned int vlv_cdclk_freq;
        unsigned int hpll_freq;

        /**
         * 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 list_head vm_list; /* Global list of all address spaces */
        struct i915_gtt gtt; /* VM representing the global address space */

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

        /* Kernel Modesetting */

        struct sdvo_device_mapping sdvo_mappings[2];

        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

        int num_shared_dpll;
        struct intel_shared_dpll shared_dplls[I915_NUM_PLLS];
        int dpio_phy_iosf_port[I915_NUM_PHYS_VLV];

        struct i915_workarounds workarounds;

        /* Reclocking support */
        bool render_reclock_avail;
        bool lvds_downclock_avail;
        /* indicates the reduced downclock for LVDS*/
        int lvds_downclock;

        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. */
        size_t ellc_size;

        /* 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_I915_FBDEV
        /* 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 */
        bool audio_component_registered;

        uint32_t hw_context_size;
        struct list_head context_list;

        u32 fdi_rx_config;

        u32 suspend_count;
        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;
                };
        } wm;

        struct i915_runtime_pm pm;

        struct intel_digital_port *hpd_irq_port[I915_MAX_PORTS];
        u32 long_hpd_port_mask;
        u32 short_hpd_port_mask;
        struct work_struct dig_port_work;

        /*
         * 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;

        /* Abstract the submission mechanism (legacy ringbuffer or execlists) away */
        struct {
                int (*do_execbuf)(struct drm_device *dev, struct drm_file *file,
                                  struct intel_engine_cs *ring,
                                  struct intel_context *ctx,
                                  struct drm_i915_gem_execbuffer2 *args,
                                  struct list_head *vmas,
                                  struct drm_i915_gem_object *batch_obj,
                                  u64 exec_start, u32 flags);
                int (*init_rings)(struct drm_device *dev);
                void (*cleanup_ring)(struct intel_engine_cs *ring);
                void (*stop_ring)(struct intel_engine_cs *ring);
        } gt;

        uint32_t request_uniq;

        /*
         * 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 dev->dev_private;
}

static inline struct drm_i915_private *dev_to_i915(struct device *dev)
{
        return to_i915(dev_get_drvdata(dev));
}

/* Iterate over initialised rings */
#define for_each_ring(ring__, dev_priv__, i__) \
        for ((i__) = 0; (i__) < I915_NUM_RINGS; (i__)++) \
                if (((ring__) = &(dev_priv__)->ring[(i__)]), intel_ring_initialized((ring__)))

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 {
        /* 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-vise. 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_FRONTBUFFER_BITS_PER_PIPE 4
#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) \
        (1 << (2 +(INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
#define INTEL_FRONTBUFFER_OVERLAY(pipe) \
        (1 << (3 +(INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
#define INTEL_FRONTBUFFER_ALL_MASK(pipe) \
        (0xf << (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 ring_list;
        /** Used in execbuf to temporarily hold a ref */
        struct list_head obj_exec_link;

        struct list_head batch_pool_list;

        /**
         * 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:1;

        /**
         * 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;
        unsigned int pin_mappable:1;
        unsigned int pin_display: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 has_dma_mapping:1;

        unsigned int frontbuffer_bits:INTEL_FRONTBUFFER_BITS;

        struct sg_table *pages;
        int pages_pin_count;

        /* prime dma-buf support */
        void *dma_buf_vmapping;
        int vmapping_count;

        /** Breadcrumb of last rendering to the buffer. */
        struct drm_i915_gem_request *last_read_req;
        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;
        };
};
#define to_intel_bo(x) container_of(x, struct drm_i915_gem_object, base)

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

/**
 * Request queue structure.
 *
 * The request queue allows us to note sequence numbers that have been emitted
 * and may be associated with active buffers to be retired.
 *
 * By keeping this list, we can avoid having to do questionable sequence
 * number comparisons on buffer last_read|write_seqno. It also allows an
 * emission time to be associated with the request for tracking how far ahead
 * of the GPU the submission is.
 */
struct drm_i915_gem_request {
        struct kref ref;

        /** On Which ring this request was generated */
        struct intel_engine_cs *ring;

        /** GEM sequence number associated with this request. */
        uint32_t seqno;

        /** Position in the ringbuffer of the start of the request */
        u32 head;

        /** Position in the ringbuffer of the end of the request */
        u32 tail;

        /** Context related to this request */
        struct intel_context *ctx;

        /** Batch buffer related to this request if any */
        struct drm_i915_gem_object *batch_obj;

        /** Time at which this request was emitted, in jiffies. */
        unsigned long emitted_jiffies;

        /** global list entry for this request */
        struct list_head list;

        struct drm_i915_file_private *file_priv;
        /** file_priv list entry for this request */
        struct list_head client_list;

        uint32_t uniq;
};

void i915_gem_request_free(struct kref *req_ref);

static inline uint32_t
i915_gem_request_get_seqno(struct drm_i915_gem_request *req)
{
        return req ? req->seqno : 0;
}

static inline struct intel_engine_cs *
i915_gem_request_get_ring(struct drm_i915_gem_request *req)
{
        return req ? req->ring : NULL;
}

static inline void
i915_gem_request_reference(struct drm_i915_gem_request *req)
{
        kref_get(&req->ref);
}

static inline void
i915_gem_request_unreference(struct drm_i915_gem_request *req)
{
        WARN_ON(!mutex_is_locked(&req->ring->dev->struct_mutex));
        kref_put(&req->ref, i915_gem_request_free);
}

static inline void i915_gem_request_assign(struct drm_i915_gem_request **pdst,
                                           struct drm_i915_gem_request *src)
{
        if (src)
                i915_gem_request_reference(src);

        if (*pdst)
                i915_gem_request_unreference(*pdst);

        *pdst = src;
}

/*
 * XXX: i915_gem_request_completed should be here but currently needs the
 * definition of i915_seqno_passed() which is below. It will be moved in
 * a later patch when the call to i915_seqno_passed() is obsoleted...
 */

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

        struct {
                spinlock_t lock;
                struct list_head request_list;
                struct delayed_work idle_work;
        } mm;
        struct idr context_idr;

        atomic_t rps_wait_boost;
        struct  intel_engine_cs *bsd_ring;
};

/*
 * 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.
         */
        struct {
                u32 offset;
                u32 mask;
        } 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_DEVID(p)  (INTEL_INFO(p)->device_id)

#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_SNB_GT1(dev)         (INTEL_DEVID(dev) == 0x0102 || \
                                 INTEL_DEVID(dev) == 0x0106 || \
                                 INTEL_DEVID(dev) == 0x010A)
#define IS_VALLEYVIEW(dev)      (INTEL_INFO(dev)->is_valleyview)
#define IS_CHERRYVIEW(dev)      (INTEL_INFO(dev)->is_valleyview && IS_GEN8(dev))
#define IS_HASWELL(dev) (INTEL_INFO(dev)->is_haswell)
#define IS_BROADWELL(dev)       (!INTEL_INFO(dev)->is_valleyview && IS_GEN8(dev))
#define IS_SKYLAKE(dev) (INTEL_INFO(dev)->is_skylake)
#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) == 0x2  || \
                                 (INTEL_DEVID(dev) & 0xf) == 0x6 || \
                                 (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_PRELIMINARY_HW(intel_info) ((intel_info)->is_preliminary)

/*
 * 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 == 2)
#define IS_GEN3(dev)    (INTEL_INFO(dev)->gen == 3)
#define IS_GEN4(dev)    (INTEL_INFO(dev)->gen == 4)
#define IS_GEN5(dev)    (INTEL_INFO(dev)->gen == 5)
#define IS_GEN6(dev)    (INTEL_INFO(dev)->gen == 6)
#define IS_GEN7(dev)    (INTEL_INFO(dev)->gen == 7)
#define IS_GEN8(dev)    (INTEL_INFO(dev)->gen == 8)
#define IS_GEN9(dev)    (INTEL_INFO(dev)->gen == 9)

#define RENDER_RING             (1<<RCS)
#define BSD_RING                (1<<VCS)
#define BLT_RING                (1<<BCS)
#define VEBOX_RING              (1<<VECS)
#define BSD2_RING               (1<<VCS2)
#define HAS_BSD(dev)            (INTEL_INFO(dev)->ring_mask & BSD_RING)
#define HAS_BSD2(dev)           (INTEL_INFO(dev)->ring_mask & BSD2_RING)
#define HAS_BLT(dev)            (INTEL_INFO(dev)->ring_mask & BLT_RING)
#define HAS_VEBOX(dev)          (INTEL_INFO(dev)->ring_mask & VEBOX_RING)
#define HAS_LLC(dev)            (INTEL_INFO(dev)->has_llc)
#define HAS_WT(dev)             ((IS_HASWELL(dev) || IS_BROADWELL(dev)) && \
                                 __I915__(dev)->ellc_size)
#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 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))
/*
 * 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_DIGITAL_OUTPUTS(dev)   (!IS_GEN2(dev) && !IS_PINEVIEW(dev))
#define SUPPORTS_INTEGRATED_HDMI(dev)   (IS_G4X(dev) || IS_GEN5(dev))
#define SUPPORTS_INTEGRATED_DP(dev)     (IS_G4X(dev) || IS_GEN5(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_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))
#define HAS_RUNTIME_PM(dev)     (IS_GEN6(dev) || IS_HASWELL(dev) || \
                                 IS_BROADWELL(dev) || IS_VALLEYVIEW(dev))
#define HAS_RC6(dev)            (INTEL_INFO(dev)->gen >= 6)
#define HAS_RC6p(dev)           (INTEL_INFO(dev)->gen == 6 || IS_IVYBRIDGE(dev))

#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_TYPE(dev) (__I915__(dev)->pch_type)
#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_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))

/* 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

#include "i915_trace.h"

extern const struct drm_ioctl_desc i915_ioctls[];
extern int i915_max_ioctl;

extern int i915_suspend_legacy(struct drm_device *dev, pm_message_t state);
extern int i915_resume_legacy(struct drm_device *dev);
extern int i915_master_create(struct drm_device *dev, struct drm_master *master);
extern void i915_master_destroy(struct drm_device *dev, struct drm_master *master);

/* i915_params.c */
struct i915_params {
        int modeset;
        int panel_ignore_lid;
        unsigned int powersave;
        int semaphores;
        unsigned int lvds_downclock;
        int lvds_channel_mode;
        int panel_use_ssc;
        int vbt_sdvo_panel_type;
        int enable_rc6;
        int enable_fbc;
        int enable_ppgtt;
        int enable_execlists;
        int enable_psr;
        unsigned int preliminary_hw_support;
        int disable_power_well;
        int enable_ips;
        int invert_brightness;
        int enable_cmd_parser;
        /* leave bools at the end to not create holes */
        bool enable_hangcheck;
        bool fastboot;
        bool prefault_disable;
        bool reset;
        bool disable_display;
        bool disable_vtd_wa;
        int use_mmio_flip;
        bool mmio_debug;
        bool verbose_state_checks;
};
extern struct i915_params i915 __read_mostly;

                                /* i915_dma.c */
extern int i915_driver_load(struct drm_device *, unsigned long flags);
extern int i915_driver_unload(struct drm_device *);
extern int i915_driver_open(struct drm_device *dev, struct drm_file *file);
extern void i915_driver_lastclose(struct drm_device * dev);
extern void i915_driver_preclose(struct drm_device *dev,
                                 struct drm_file *file);
extern void i915_driver_postclose(struct drm_device *dev,
                                  struct drm_file *file);
extern int i915_driver_device_is_agp(struct drm_device * dev);
#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_device *dev);
extern int i915_reset(struct drm_device *dev);
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);
void intel_hpd_cancel_work(struct drm_i915_private *dev_priv);

/* i915_irq.c */
void i915_queue_hangcheck(struct drm_device *dev);
__printf(3, 4)
void i915_handle_error(struct drm_device *dev, bool wedged,
                       const char *fmt, ...);

extern void intel_irq_init(struct drm_i915_private *dev_priv);
extern void intel_hpd_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_device *dev);
extern void intel_uncore_early_sanitize(struct drm_device *dev,
                                        bool restore_forcewake);
extern void intel_uncore_init(struct drm_device *dev);
extern void intel_uncore_check_errors(struct drm_device *dev);
extern void intel_uncore_fini(struct drm_device *dev);
extern void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore);

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
ironlake_enable_display_irq(struct drm_i915_private *dev_priv, u32 mask);
void
ironlake_disable_display_irq(struct drm_i915_private *dev_priv, u32 mask);
void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,
                                  uint32_t interrupt_mask,
                                  uint32_t enabled_irq_mask);
#define ibx_enable_display_interrupt(dev_priv, bits) \
        ibx_display_interrupt_update((dev_priv), (bits), (bits))
#define ibx_disable_display_interrupt(dev_priv, 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 intel_engine_cs *ring);
void i915_gem_execbuffer_retire_commands(struct drm_device *dev,
                                         struct drm_file *file,
                                         struct intel_engine_cs *ring,
                                         struct drm_i915_gem_object *obj);
int i915_gem_ringbuffer_submission(struct drm_device *dev,
                                   struct drm_file *file,
                                   struct intel_engine_cs *ring,
                                   struct intel_context *ctx,
                                   struct drm_i915_gem_execbuffer2 *args,
                                   struct list_head *vmas,
                                   struct drm_i915_gem_object *batch_obj,
                                   u64 exec_start, u32 flags);
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);
int i915_gem_init_userptr(struct drm_device *dev);
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(struct drm_device *dev);
unsigned long i915_gem_shrink(struct drm_i915_private *dev_priv,
                              long target,
                              unsigned flags);
#define I915_SHRINK_PURGEABLE 0x1
#define I915_SHRINK_UNBOUND 0x2
#define I915_SHRINK_BOUND 0x4
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_alloc_object(struct drm_device *dev,
                                                  size_t size);
void i915_init_vm(struct drm_i915_private *dev_priv,
                  struct i915_address_space *vm);
void i915_gem_free_object(struct drm_gem_object *obj);
void i915_gem_vma_destroy(struct i915_vma *vma);

#define PIN_MAPPABLE 0x1
#define PIN_NONBLOCK 0x2
#define PIN_GLOBAL 0x4
#define PIN_OFFSET_BIAS 0x8
#define PIN_OFFSET_MASK (~4095)
int __must_check i915_gem_object_pin_view(struct drm_i915_gem_object *obj,
                                          struct i915_address_space *vm,
                                          uint32_t alignment,
                                          uint64_t flags,
                                          const struct i915_ggtt_view *view);
static inline
int __must_check i915_gem_object_pin(struct drm_i915_gem_object *obj,
                                     struct i915_address_space *vm,
                                     uint32_t alignment,
                                     uint64_t flags)
{
        return i915_gem_object_pin_view(obj, vm, alignment, flags,
                                                &i915_ggtt_view_normal);
}

int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
                  u32 flags);
int __must_check i915_vma_unbind(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 struct page *i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n)
{
        struct sg_page_iter sg_iter;

        for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, n)
                return sg_page_iter_page(&sg_iter);

        return NULL;
}
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--;
}

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);
void i915_vma_move_to_active(struct i915_vma *vma,
                             struct intel_engine_cs *ring);
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);
/**
 * Returns true if seq1 is later than seq2.
 */
static inline bool
i915_seqno_passed(uint32_t seq1, uint32_t seq2)
{
        return (int32_t)(seq1 - seq2) >= 0;
}

static inline bool i915_gem_request_completed(struct drm_i915_gem_request *req,
                                              bool lazy_coherency)
{
        u32 seqno;

        BUG_ON(req == NULL);

        seqno = req->ring->get_seqno(req->ring, lazy_coherency);

        return i915_seqno_passed(seqno, req->seqno);
}

int __must_check i915_gem_get_seqno(struct drm_device *dev, u32 *seqno);
int __must_check i915_gem_set_seqno(struct drm_device *dev, u32 seqno);
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);

struct drm_i915_gem_request *
i915_gem_find_active_request(struct intel_engine_cs *ring);

bool i915_gem_retire_requests(struct drm_device *dev);
void i915_gem_retire_requests_ring(struct intel_engine_cs *ring);
int __must_check i915_gem_check_wedge(struct i915_gpu_error *error,
                                      bool interruptible);
int __must_check i915_gem_check_olr(struct drm_i915_gem_request *req);

static inline bool i915_reset_in_progress(struct i915_gpu_error *error)
{
        return unlikely(atomic_read(&error->reset_counter)
                        & (I915_RESET_IN_PROGRESS_FLAG | I915_WEDGED));
}

static inline bool i915_terminally_wedged(struct i915_gpu_error *error)
{
        return atomic_read(&error->reset_counter) & I915_WEDGED;
}

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

static inline bool i915_stop_ring_allow_ban(struct drm_i915_private *dev_priv)
{
        return dev_priv->gpu_error.stop_rings == 0 ||
                dev_priv->gpu_error.stop_rings & I915_STOP_RING_ALLOW_BAN;
}

static inline bool i915_stop_ring_allow_warn(struct drm_i915_private *dev_priv)
{
        return dev_priv->gpu_error.stop_rings == 0 ||
                dev_priv->gpu_error.stop_rings & I915_STOP_RING_ALLOW_WARN;
}

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_object_finish_gpu(struct drm_i915_gem_object *obj);
int __must_check i915_gem_init(struct drm_device *dev);
int i915_gem_init_rings(struct drm_device *dev);
int __must_check i915_gem_init_hw(struct drm_device *dev);
int i915_gem_l3_remap(struct intel_engine_cs *ring, int slice);
void i915_gem_init_swizzling(struct drm_device *dev);
void i915_gem_cleanup_ringbuffer(struct drm_device *dev);
int __must_check i915_gpu_idle(struct drm_device *dev);
int __must_check i915_gem_suspend(struct drm_device *dev);
int __i915_add_request(struct intel_engine_cs *ring,
                       struct drm_file *file,
                       struct drm_i915_gem_object *batch_obj);
#define i915_add_request(ring) \
        __i915_add_request(ring, NULL, NULL)
int __i915_wait_request(struct drm_i915_gem_request *req,
                        unsigned reset_counter,
                        bool interruptible,
                        s64 *timeout,
                        struct drm_i915_file_private *file_priv);
int __must_check i915_wait_request(struct drm_i915_gem_request *req);
int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
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,
                                     struct intel_engine_cs *pipelined);
void i915_gem_object_unpin_from_display_plane(struct drm_i915_gem_object *obj);
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);

void i915_gem_restore_fences(struct drm_device *dev);

unsigned long i915_gem_obj_offset_view(struct drm_i915_gem_object *o,
                                       struct i915_address_space *vm,
                                       enum i915_ggtt_view_type view);
static inline
unsigned long i915_gem_obj_offset(struct drm_i915_gem_object *o,
                                  struct i915_address_space *vm)
{
        return i915_gem_obj_offset_view(o, vm, I915_GGTT_VIEW_NORMAL);
}
bool i915_gem_obj_bound_any(struct drm_i915_gem_object *o);
bool i915_gem_obj_bound_view(struct drm_i915_gem_object *o,
                             struct i915_address_space *vm,
                             enum i915_ggtt_view_type view);
static inline
bool i915_gem_obj_bound(struct drm_i915_gem_object *o,
                        struct i915_address_space *vm)
{
        return i915_gem_obj_bound_view(o, vm, I915_GGTT_VIEW_NORMAL);
}

unsigned long i915_gem_obj_size(struct drm_i915_gem_object *o,
                                struct i915_address_space *vm);
struct i915_vma *i915_gem_obj_to_vma_view(struct drm_i915_gem_object *obj,
                                          struct i915_address_space *vm,
                                          const struct i915_ggtt_view *view);
static inline
struct i915_vma *i915_gem_obj_to_vma(struct drm_i915_gem_object *obj,
                                     struct i915_address_space *vm)
{
        return i915_gem_obj_to_vma_view(obj, vm, &i915_ggtt_view_normal);
}

struct i915_vma *
i915_gem_obj_lookup_or_create_vma_view(struct drm_i915_gem_object *obj,
                                       struct i915_address_space *vm,
                                       const struct i915_ggtt_view *view);

static inline
struct i915_vma *
i915_gem_obj_lookup_or_create_vma(struct drm_i915_gem_object *obj,
                                  struct i915_address_space *vm)
{
        return i915_gem_obj_lookup_or_create_vma_view(obj, vm,
                                                &i915_ggtt_view_normal);
}

struct i915_vma *i915_gem_obj_to_ggtt(struct drm_i915_gem_object *obj);
static inline bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj) {
        struct i915_vma *vma;
        list_for_each_entry(vma, &obj->vma_list, vma_link)
                if (vma->pin_count > 0)
                        return true;
        return false;
}

/* Some GGTT VM helpers */
#define i915_obj_to_ggtt(obj) \
        (&((struct drm_i915_private *)(obj)->base.dev->dev_private)->gtt.base)
static inline bool i915_is_ggtt(struct i915_address_space *vm)
{
        struct i915_address_space *ggtt =
                &((struct drm_i915_private *)(vm)->dev->dev_private)->gtt.base;
        return vm == ggtt;
}

static inline struct i915_hw_ppgtt *
i915_vm_to_ppgtt(struct i915_address_space *vm)
{
        WARN_ON(i915_is_ggtt(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_bound(obj, i915_obj_to_ggtt(obj));
}

static inline unsigned long
i915_gem_obj_ggtt_offset(struct drm_i915_gem_object *obj)
{
        return i915_gem_obj_offset(obj, i915_obj_to_ggtt(obj));
}

static inline unsigned long
i915_gem_obj_ggtt_size(struct drm_i915_gem_object *obj)
{
        return i915_gem_obj_size(obj, i915_obj_to_ggtt(obj));
}

static inline int __must_check
i915_gem_obj_ggtt_pin(struct drm_i915_gem_object *obj,
                      uint32_t alignment,
                      unsigned flags)
{
        return i915_gem_object_pin(obj, i915_obj_to_ggtt(obj),
                                   alignment, flags | PIN_GLOBAL);
}

static inline int
i915_gem_object_ggtt_unbind(struct drm_i915_gem_object *obj)
{
        return i915_vma_unbind(i915_gem_obj_to_ggtt(obj));
}

void i915_gem_object_ggtt_unpin(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_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);
int i915_gem_context_enable(struct drm_i915_private *dev_priv);
void i915_gem_context_close(struct drm_device *dev, struct drm_file *file);
int i915_switch_context(struct intel_engine_cs *ring,
                        struct intel_context *to);
struct intel_context *
i915_gem_context_get(struct drm_i915_file_private *file_priv, u32 id);
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);
static inline void i915_gem_context_reference(struct intel_context *ctx)
{
        kref_get(&ctx->ref);
}

static inline void i915_gem_context_unreference(struct intel_context *ctx)
{
        kref_put(&ctx->ref, i915_gem_context_free);
}

static inline bool i915_gem_context_is_default(const struct intel_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);

/* 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 i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle);
int i915_gem_evict_everything(struct drm_device *dev);

/* belongs in i915_gem_gtt.h */
static inline void i915_gem_chipset_flush(struct drm_device *dev)
{
        if (INTEL_INFO(dev)->gen < 6)
                intel_gtt_chipset_flush();
}

/* i915_gem_stolen.c */
int i915_gem_init_stolen(struct drm_device *dev);
int i915_gem_stolen_setup_compression(struct drm_device *dev, int size, int fb_cpp);
void i915_gem_stolen_cleanup_compression(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_tiling.c */
static inline bool i915_gem_object_needs_bit17_swizzle(struct drm_i915_gem_object *obj)
{
        struct drm_i915_private *dev_priv = obj->base.dev->dev_private;

        return dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_9_10_17 &&
                obj->tiling_mode != I915_TILING_NONE;
}

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

/* i915_debugfs.c */
int i915_debugfs_init(struct drm_minor *minor);
void i915_debugfs_cleanup(struct drm_minor *minor);
#ifdef CONFIG_DEBUG_FS
void intel_display_crc_init(struct drm_device *dev);
#else
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_device *dev, bool wedge,
                              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_device *dev, uint32_t *instdone);
const char *i915_cache_level_str(struct drm_i915_private *i915, int type);

/* i915_gem_batch_pool.c */
void i915_gem_batch_pool_init(struct drm_device *dev,
                              struct i915_gem_batch_pool *pool);
void i915_gem_batch_pool_fini(struct i915_gem_batch_pool *pool);
struct drm_i915_gem_object*
i915_gem_batch_pool_get(struct i915_gem_batch_pool *pool, size_t size);

/* i915_cmd_parser.c */
int i915_cmd_parser_get_version(void);
int i915_cmd_parser_init_ring(struct intel_engine_cs *ring);
void i915_cmd_parser_fini_ring(struct intel_engine_cs *ring);
bool i915_needs_cmd_parser(struct intel_engine_cs *ring);
int i915_parse_cmds(struct intel_engine_cs *ring,
                    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_ums.c */
void i915_save_display_reg(struct drm_device *dev);
void i915_restore_display_reg(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);
static inline bool intel_gmbus_is_port_valid(unsigned port)
{
        return (port >= GMBUS_PORT_SSC && port <= GMBUS_PORT_DPD);
}

extern struct i2c_adapter *intel_gmbus_get_adapter(
                struct drm_i915_private *dev_priv, unsigned port);
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_opregion.c */
#ifdef CONFIG_ACPI
extern int intel_opregion_setup(struct drm_device *dev);
extern void intel_opregion_init(struct drm_device *dev);
extern void intel_opregion_fini(struct drm_device *dev);
extern void intel_opregion_asle_intr(struct drm_device *dev);
extern int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
                                         bool enable);
extern int intel_opregion_notify_adapter(struct drm_device *dev,
                                         pci_power_t state);
#else
static inline int intel_opregion_setup(struct drm_device *dev) { return 0; }
static inline void intel_opregion_init(struct drm_device *dev) { return; }
static inline void intel_opregion_fini(struct drm_device *dev) { return; }
static inline void intel_opregion_asle_intr(struct drm_device *dev) { return; }
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_device *dev, pci_power_t state)
{
        return 0;
}
#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 */

/* 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 void intel_connector_unregister(struct intel_connector *);
extern int intel_modeset_vga_set_state(struct drm_device *dev, bool state);
extern void intel_modeset_setup_hw_state(struct drm_device *dev,
                                         bool force_restore);
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_device *dev, u8 val);
extern void intel_init_pch_refclk(struct drm_device *dev);
extern void gen6_set_rps(struct drm_device *dev, u8 val);
extern void valleyview_set_rps(struct drm_device *dev, u8 val);
extern void intel_set_memory_cxsr(struct drm_i915_private *dev_priv,
                                  bool enable);
extern void intel_detect_pch(struct drm_device *dev);
extern int intel_trans_dp_port_sel(struct drm_crtc *crtc);
extern int intel_enable_rc6(const struct drm_device *dev);

extern bool i915_semaphore_is_enabled(struct drm_device *dev);
int i915_reg_read_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file);
int i915_get_reset_stats_ioctl(struct drm_device *dev, void *data,
                               struct drm_file *file);

void intel_notify_mmio_flip(struct intel_engine_cs *ring);

/* overlay */
extern struct intel_overlay_error_state *intel_overlay_capture_error_state(struct drm_device *dev);
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_device *dev);
extern void intel_display_print_error_state(struct drm_i915_error_state_buf *e,
                                            struct drm_device *dev,
                                            struct intel_display_error_state *error);

/* On SNB platform, before reading ring registers forcewake bit
 * must be set to prevent GT core from power down and stale values being
 * returned.
 */
void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv, int fw_engine);
void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv, int fw_engine);
void assert_force_wake_inactive(struct drm_i915_private *dev_priv);

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_gpio_nc_read(struct drm_i915_private *dev_priv, u32 reg);
void vlv_gpio_nc_write(struct drm_i915_private *dev_priv, 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_gps_core_read(struct drm_i915_private *dev_priv, u32 reg);
void vlv_gps_core_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);

int vlv_gpu_freq(struct drm_i915_private *dev_priv, int val);
int vlv_freq_opcode(struct drm_i915_private *dev_priv, int val);

#define FORCEWAKE_RENDER        (1 << 0)
#define FORCEWAKE_MEDIA         (1 << 1)
#define FORCEWAKE_BLITTER       (1 << 2)
#define FORCEWAKE_ALL           (FORCEWAKE_RENDER | FORCEWAKE_MEDIA | \
                                        FORCEWAKE_BLITTER)


#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 = I915_READ(upper_reg);                       \
                u32 lower = I915_READ(lower_reg);                       \
                u32 tmp = I915_READ(upper_reg);                         \
                if (upper != tmp) {                                     \
                        upper = tmp;                                    \
                        lower = I915_READ(lower_reg);                   \
                        WARN_ON(I915_READ(upper_reg) != upper);         \
                }                                                       \
                (u64)upper << 32 | lower; })

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

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

static inline uint32_t i915_vgacntrl_reg(struct drm_device *dev)
{
        if (IS_VALLEYVIEW(dev))
                return VLV_VGACNTRL;
        else if (INTEL_INFO(dev)->gen >= 5)
                return CPU_VGACNTRL;
        else
                return VGACNTRL;
}

static inline void __user *to_user_ptr(u64 address)
{
        return (void __user *)(uintptr_t)address;
}

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 void i915_trace_irq_get(struct intel_engine_cs *ring,
                                      struct drm_i915_gem_request *req)
{
        if (ring->trace_irq_req == NULL && ring->irq_get(ring))
                i915_gem_request_assign(&ring->trace_irq_req, req);
}

#endif