drm/i915: proper use of forcewake

[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 "i915_reg.h"
#include "intel_bios.h"
#include "intel_ringbuffer.h"
#include <linux/io-mapping.h>
#include <linux/i2c.h>
#include <drm/intel-gtt.h>

/* General customization:
 */

#define DRIVER_AUTHOR           "Tungsten Graphics, Inc."

#define DRIVER_NAME             "i915"
#define DRIVER_DESC             "Intel Graphics"
#define DRIVER_DATE             "20080730"

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

enum plane {
        PLANE_A = 0,
        PLANE_B,
        PLANE_C,
};
#define plane_name(p) ((p) + 'A')

#define I915_GEM_GPU_DOMAINS    (~(I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT))

#define for_each_pipe(p) for ((p) = 0; (p) < dev_priv->num_pipe; (p)++)

/* 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_COHERENCY 0
#define WATCH_LISTS     0

#define I915_GEM_PHYS_CURSOR_0 1
#define I915_GEM_PHYS_CURSOR_1 2
#define I915_GEM_PHYS_OVERLAY_REGS 3
#define I915_MAX_PHYS_OBJECT (I915_GEM_PHYS_OVERLAY_REGS)

struct drm_i915_gem_phys_object {
        int id;
        struct page **page_list;
        drm_dma_handle_t *handle;
        struct drm_i915_gem_object *cur_obj;
};

struct mem_block {
        struct mem_block *next;
        struct mem_block *prev;
        int start;
        int size;
        struct drm_file *file_priv; /* NULL: free, -1: heap, other: real files */
};

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

struct intel_opregion {
        struct opregion_header *header;
        struct opregion_acpi *acpi;
        struct opregion_swsci *swsci;
        struct opregion_asle *asle;
        void *vbt;
        u32 __iomem *lid_state;
};
#define OPREGION_SIZE            (8*1024)

struct intel_overlay;
struct intel_overlay_error_state;

struct drm_i915_master_private {
        drm_local_map_t *sarea;
        struct _drm_i915_sarea *sarea_priv;
};
#define I915_FENCE_REG_NONE -1

struct drm_i915_fence_reg {
        struct list_head lru_list;
        struct drm_i915_gem_object *obj;
        uint32_t setup_seqno;
};

struct sdvo_device_mapping {
        u8 initialized;
        u8 dvo_port;
        u8 slave_addr;
        u8 dvo_wiring;
        u8 i2c_pin;
        u8 i2c_speed;
        u8 ddc_pin;
};

struct intel_display_error_state;

struct drm_i915_error_state {
        u32 eir;
        u32 pgtbl_er;
        u32 pipestat[I915_MAX_PIPES];
        u32 ipeir;
        u32 ipehr;
        u32 instdone;
        u32 acthd;
        u32 error; /* gen6+ */
        u32 bcs_acthd; /* gen6+ blt engine */
        u32 bcs_ipehr;
        u32 bcs_ipeir;
        u32 bcs_instdone;
        u32 bcs_seqno;
        u32 vcs_acthd; /* gen6+ bsd engine */
        u32 vcs_ipehr;
        u32 vcs_ipeir;
        u32 vcs_instdone;
        u32 vcs_seqno;
        u32 instpm;
        u32 instps;
        u32 instdone1;
        u32 seqno;
        u64 bbaddr;
        u64 fence[16];
        struct timeval time;
        struct drm_i915_error_object {
                int page_count;
                u32 gtt_offset;
                u32 *pages[0];
        } *ringbuffer[I915_NUM_RINGS], *batchbuffer[I915_NUM_RINGS];
        struct drm_i915_error_buffer {
                u32 size;
                u32 name;
                u32 seqno;
                u32 gtt_offset;
                u32 read_domains;
                u32 write_domain;
                s32 fence_reg:5;
                s32 pinned:2;
                u32 tiling:2;
                u32 dirty:1;
                u32 purgeable:1;
                u32 ring:4;
                u32 cache_level:2;
        } *active_bo, *pinned_bo;
        u32 active_bo_count, pinned_bo_count;
        struct intel_overlay_error_state *overlay;
        struct intel_display_error_state *display;
};

struct drm_i915_display_funcs {
        void (*dpms)(struct drm_crtc *crtc, int mode);
        bool (*fbc_enabled)(struct drm_device *dev);
        void (*enable_fbc)(struct drm_crtc *crtc, unsigned long interval);
        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);
        void (*update_wm)(struct drm_device *dev);
        int (*crtc_mode_set)(struct drm_crtc *crtc,
                             struct drm_display_mode *mode,
                             struct drm_display_mode *adjusted_mode,
                             int x, int y,
                             struct drm_framebuffer *old_fb);

        /* clock updates for mode set */
        /* cursor updates */
        /* render clock increase/decrease */
        /* display clock increase/decrease */
        /* pll clock increase/decrease */
        /* clock gating init */
};

struct intel_device_info {
        u8 gen;
        u8 is_mobile : 1;
        u8 is_i85x : 1;
        u8 is_i915g : 1;
        u8 is_i945gm : 1;
        u8 is_g33 : 1;
        u8 need_gfx_hws : 1;
        u8 is_g4x : 1;
        u8 is_pineview : 1;
        u8 is_broadwater : 1;
        u8 is_crestline : 1;
        u8 has_fbc : 1;
        u8 has_pipe_cxsr : 1;
        u8 has_hotplug : 1;
        u8 cursor_needs_physical : 1;
        u8 has_overlay : 1;
        u8 overlay_needs_physical : 1;
        u8 supports_tv : 1;
        u8 has_bsd_ring : 1;
        u8 has_blt_ring : 1;
};

enum no_fbc_reason {
        FBC_NO_OUTPUT, /* no outputs enabled to compress */
        FBC_STOLEN_TOO_SMALL, /* not enough space to hold compressed 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 */
};

enum intel_pch {
        PCH_IBX,        /* Ibexpeak PCH */
        PCH_CPT,        /* Cougarpoint PCH */
};

#define QUIRK_PIPEA_FORCE (1<<0)

struct intel_fbdev;

typedef struct drm_i915_private {
        struct drm_device *dev;

        const struct intel_device_info *info;

        int has_gem;
        int relative_constants_mode;

        void __iomem *regs;

        struct intel_gmbus {
                struct i2c_adapter adapter;
                struct i2c_adapter *force_bit;
                u32 reg0;
        } *gmbus;

        struct pci_dev *bridge_dev;
        struct intel_ring_buffer ring[I915_NUM_RINGS];
        uint32_t next_seqno;

        drm_dma_handle_t *status_page_dmah;
        uint32_t counter;
        drm_local_map_t hws_map;
        struct drm_i915_gem_object *pwrctx;
        struct drm_i915_gem_object *renderctx;

        struct resource mch_res;

        unsigned int cpp;
        int back_offset;
        int front_offset;
        int current_page;
        int page_flipping;

        atomic_t irq_received;

        /* protects the irq masks */
        spinlock_t irq_lock;
        /** Cached value of IMR to avoid reads in updating the bitfield */
        u32 pipestat[2];
        u32 irq_mask;
        u32 gt_irq_mask;
        u32 pch_irq_mask;

        u32 hotplug_supported_mask;
        struct work_struct hotplug_work;

        int tex_lru_log_granularity;
        int allow_batchbuffer;
        struct mem_block *agp_heap;
        unsigned int sr01, adpa, ppcr, dvob, dvoc, lvds;
        int vblank_pipe;
        int num_pipe;

        /* For hangcheck timer */
#define DRM_I915_HANGCHECK_PERIOD 1500 /* in ms */
        struct timer_list hangcheck_timer;
        int hangcheck_count;
        uint32_t last_acthd;
        uint32_t last_instdone;
        uint32_t last_instdone1;

        unsigned long cfb_size;
        unsigned long cfb_pitch;
        unsigned long cfb_offset;
        int cfb_fence;
        int cfb_plane;
        int cfb_y;

        struct intel_opregion opregion;

        /* overlay */
        struct intel_overlay *overlay;

        /* LVDS info */
        int backlight_level;  /* restore backlight to this value */
        bool backlight_enabled;
        struct drm_display_mode *panel_fixed_mode;
        struct drm_display_mode *lfp_lvds_vbt_mode; /* if any */
        struct drm_display_mode *sdvo_lvds_vbt_mode; /* if any */

        /* Feature bits from the VBIOS */
        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;
        int lvds_ssc_freq;
        struct {
                int rate;
                int lanes;
                int preemphasis;
                int vswing;

                bool initialized;
                bool support;
                int bpp;
                struct edp_power_seq pps;
        } edp;
        bool no_aux_handshake;

        struct notifier_block lid_notifier;

        int crt_ddc_pin;
        struct drm_i915_fence_reg fence_regs[16]; /* 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;

        spinlock_t error_lock;
        struct drm_i915_error_state *first_error;
        struct work_struct error_work;
        struct completion error_completion;
        struct workqueue_struct *wq;

        /* Display functions */
        struct drm_i915_display_funcs display;

        /* PCH chipset type */
        enum intel_pch pch_type;

        unsigned long quirks;

        /* Register state */
        bool modeset_on_lid;
        u8 saveLBB;
        u32 saveDSPACNTR;
        u32 saveDSPBCNTR;
        u32 saveDSPARB;
        u32 saveHWS;
        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 saveDPFC_CB_BASE;
        u32 saveFBC_CFB_BASE;
        u32 saveFBC_LL_BASE;
        u32 saveFBC_CONTROL;
        u32 saveFBC_CONTROL2;
        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[16];
        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;

        struct {
                /** Bridge to intel-gtt-ko */
                const struct intel_gtt *gtt;
                /** Memory allocator for GTT stolen memory */
                struct drm_mm stolen;
                /** Memory allocator for GTT */
                struct drm_mm gtt_space;
                /** List of all objects in gtt_space. Used to restore gtt
                 * mappings on resume */
                struct list_head gtt_list;

                /** Usable portion of the GTT for GEM */
                unsigned long gtt_start;
                unsigned long gtt_mappable_end;
                unsigned long gtt_end;

                struct io_mapping *gtt_mapping;
                int gtt_mtrr;

                struct shrinker inactive_shrinker;

                /**
                 * List of objects currently involved in rendering.
                 *
                 * Includes buffers having the contents of their GPU caches
                 * flushed, not necessarily primitives.  last_rendering_seqno
                 * represents when the rendering involved will be completed.
                 *
                 * A reference is held on the buffer while on this list.
                 */
                struct list_head active_list;

                /**
                 * List of objects which are not in the ringbuffer but which
                 * still have a write_domain which needs to be flushed before
                 * unbinding.
                 *
                 * last_rendering_seqno is 0 while an object is in this list.
                 *
                 * A reference is held on the buffer while on this list.
                 */
                struct list_head flushing_list;

                /**
                 * LRU list of objects which are not in the ringbuffer and
                 * are ready to unbind, but are still in the GTT.
                 *
                 * last_rendering_seqno is 0 while an object is in this list.
                 *
                 * A reference is not held on the buffer while on this list,
                 * as merely being GTT-bound shouldn't prevent its being
                 * freed, and we'll pull it off the list in the free path.
                 */
                struct list_head inactive_list;

                /**
                 * LRU list of objects which are not in the ringbuffer but
                 * are still pinned in the GTT.
                 */
                struct list_head pinned_list;

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

                /**
                 * List of objects currently pending being freed.
                 *
                 * These objects are no longer in use, but due to a signal
                 * we were prevented from freeing them at the appointed time.
                 */
                struct list_head deferred_free_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;

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

                /**
                 * Flag if the X Server, and thus DRM, is not currently in
                 * control of the device.
                 *
                 * This is set between LeaveVT and EnterVT.  It needs to be
                 * replaced with a semaphore.  It also needs to be
                 * transitioned away from for kernel modesetting.
                 */
                int suspended;

                /**
                 * Flag if the hardware appears to be wedged.
                 *
                 * This is set when attempts to idle the device timeout.
                 * It prevents command submission from occurring and makes
                 * every pending request fail
                 */
                atomic_t wedged;

                /** 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;

                /* storage for physical objects */
                struct drm_i915_gem_phys_object *phys_objs[I915_MAX_PHYS_OBJECT];

                /* accounting, useful for userland debugging */
                size_t gtt_total;
                size_t mappable_gtt_total;
                size_t object_memory;
                u32 object_count;
        } mm;
        struct sdvo_device_mapping sdvo_mappings[2];
        /* indicate whether the LVDS_BORDER should be enabled or not */
        unsigned int lvds_border_bits;
        /* Panel fitter placement and size for Ironlake+ */
        u32 pch_pf_pos, pch_pf_size;
        int panel_t3, panel_t12;

        struct drm_crtc *plane_to_crtc_mapping[2];
        struct drm_crtc *pipe_to_crtc_mapping[2];
        wait_queue_head_t pending_flip_queue;
        bool flip_pending_is_done;

        /* Reclocking support */
        bool render_reclock_avail;
        bool lvds_downclock_avail;
        /* indicates the reduced downclock for LVDS*/
        int lvds_downclock;
        struct work_struct idle_work;
        struct timer_list idle_timer;
        bool busy;
        u16 orig_clock;
        int child_dev_num;
        struct child_device_config *child_dev;
        struct drm_connector *int_lvds_connector;

        bool mchbar_need_disable;

        u8 cur_delay;
        u8 min_delay;
        u8 max_delay;
        u8 fmax;
        u8 fstart;

        u64 last_count1;
        unsigned long last_time1;
        u64 last_count2;
        struct timespec last_time2;
        unsigned long gfx_power;
        int c_m;
        int r_t;
        u8 corr;
        spinlock_t *mchdev_lock;

        enum no_fbc_reason no_fbc_reason;

        struct drm_mm_node *compressed_fb;
        struct drm_mm_node *compressed_llb;

        unsigned long last_gpu_reset;

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

        struct drm_property *broadcast_rgb_property;
} drm_i915_private_t;

enum i915_cache_level {
        I915_CACHE_NONE,
        I915_CACHE_LLC,
        I915_CACHE_LLC_MLC, /* gen6+ */
};

struct drm_i915_gem_object {
        struct drm_gem_object base;

        /** Current space allocated to this object in the GTT, if any. */
        struct drm_mm_node *gtt_space;
        struct list_head gtt_list;

        /** This object's place on the active/flushing/inactive lists */
        struct list_head ring_list;
        struct list_head mm_list;
        /** This object's place on GPU write list */
        struct list_head gpu_write_list;
        /** This object's place in the batchbuffer or on the eviction list */
        struct list_head exec_list;

        /**
         * This is set if the object is on the active or flushing lists
         * (has pending rendering), and is not set if it's on inactive (ready
         * to be unbound).
         */
        unsigned int active : 1;

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

        /**
         * This is set if the object has been written to since the last
         * GPU flush.
         */
        unsigned int pending_gpu_write : 1;

        /**
         * Fence register bits (if any) for this object.  Will be set
         * as needed when mapped into the GTT.
         * Protected by dev->struct_mutex.
         *
         * Size: 4 bits for 16 fences + sign (for FENCE_REG_NONE)
         */
        signed int fence_reg : 5;

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

        /**
         * Current tiling mode for the object.
         */
        unsigned int tiling_mode : 2;
        unsigned int tiling_changed : 1;

        /** How many users have pinned this object in GTT space. The following
         * users can each hold at most one reference: pwrite/pread, pin_ioctl
         * (via user_pin_count), execbuffer (objects are not allowed multiple
         * times for the same batchbuffer), and the framebuffer code. When
         * switching/pageflipping, the framebuffer code has at most two buffers
         * pinned per crtc.
         *
         * In the worst case this is 1 + 1 + 1 + 2*2 = 7. That would fit into 3
         * bits with absolutely no headroom. So use 4 bits. */
        unsigned int pin_count : 4;
#define DRM_I915_GEM_OBJECT_MAX_PIN_COUNT 0xf

        /**
         * 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;

        /*
         * Is the GPU currently using a fence to access this buffer,
         */
        unsigned int pending_fenced_gpu_access:1;
        unsigned int fenced_gpu_access:1;

        unsigned int cache_level:2;

        struct page **pages;

        /**
         * DMAR support
         */
        struct scatterlist *sg_list;
        int num_sg;

        /**
         * Used for performing relocations during execbuffer insertion.
         */
        struct hlist_node exec_node;
        unsigned long exec_handle;
        struct drm_i915_gem_exec_object2 *exec_entry;

        /**
         * Current offset of the object in GTT space.
         *
         * This is the same as gtt_space->start
         */
        uint32_t gtt_offset;

        /** Breadcrumb of last rendering to the buffer. */
        uint32_t last_rendering_seqno;
        struct intel_ring_buffer *ring;

        /** Breadcrumb of last fenced GPU access to the buffer. */
        uint32_t last_fenced_seqno;
        struct intel_ring_buffer *last_fenced_ring;

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

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


        /**
         * If present, while GEM_DOMAIN_CPU is in the read domain this array
         * flags which individual pages are valid.
         */
        uint8_t *page_cpu_valid;

        /** User space pin count and filp owning the pin */
        uint32_t user_pin_count;
        struct drm_file *pin_filp;

        /** for phy allocated objects */
        struct drm_i915_gem_phys_object *phys_obj;

        /**
         * Number of crtcs where this object is currently the fb, but
         * will be page flipped away on the next vblank.  When it
         * reaches 0, dev_priv->pending_flip_queue will be woken up.
         */
        atomic_t pending_flip;
};

#define to_intel_bo(x) container_of(x, struct drm_i915_gem_object, base)

/**
 * 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_rendering_seqnos, and associate
 * an emission time with seqnos for tracking how far ahead of the GPU we are.
 */
struct drm_i915_gem_request {
        /** On Which ring this request was generated */
        struct intel_ring_buffer *ring;

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

        /** 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;
};

struct drm_i915_file_private {
        struct {
                struct spinlock lock;
                struct list_head request_list;
        } mm;
};

enum intel_chip_family {
        CHIP_I8XX = 0x01,
        CHIP_I9XX = 0x02,
        CHIP_I915 = 0x04,
        CHIP_I965 = 0x08,
};

#define INTEL_INFO(dev) (((struct drm_i915_private *) (dev)->dev_private)->info)

#define IS_I830(dev)            ((dev)->pci_device == 0x3577)
#define IS_845G(dev)            ((dev)->pci_device == 0x2562)
#define IS_I85X(dev)            (INTEL_INFO(dev)->is_i85x)
#define IS_I865G(dev)           ((dev)->pci_device == 0x2572)
#define IS_I915G(dev)           (INTEL_INFO(dev)->is_i915g)
#define IS_I915GM(dev)          ((dev)->pci_device == 0x2592)
#define IS_I945G(dev)           ((dev)->pci_device == 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)            ((dev)->pci_device == 0x2A42)
#define IS_G4X(dev)             (INTEL_INFO(dev)->is_g4x)
#define IS_PINEVIEW_G(dev)      ((dev)->pci_device == 0xa001)
#define IS_PINEVIEW_M(dev)      ((dev)->pci_device == 0xa011)
#define IS_PINEVIEW(dev)        (INTEL_INFO(dev)->is_pineview)
#define IS_G33(dev)             (INTEL_INFO(dev)->is_g33)
#define IS_IRONLAKE_D(dev)      ((dev)->pci_device == 0x0042)
#define IS_IRONLAKE_M(dev)      ((dev)->pci_device == 0x0046)
#define IS_MOBILE(dev)          (INTEL_INFO(dev)->is_mobile)

#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 HAS_BSD(dev)            (INTEL_INFO(dev)->has_bsd_ring)
#define HAS_BLT(dev)            (INTEL_INFO(dev)->has_blt_ring)
#define I915_NEED_GFX_HWS(dev)  (INTEL_INFO(dev)->need_gfx_hws)

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

/* 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_EDP(dev)               (IS_IRONLAKE_M(dev))
#define SUPPORTS_TV(dev)                (INTEL_INFO(dev)->supports_tv)
#define I915_HAS_HOTPLUG(dev)            (INTEL_INFO(dev)->has_hotplug)
/* dsparb controlled by hw only */
#define DSPARB_HWCONTROL(dev) (IS_G4X(dev) || IS_IRONLAKE(dev))

#define HAS_FW_BLC(dev) (INTEL_INFO(dev)->gen > 2)
#define HAS_PIPE_CXSR(dev) (INTEL_INFO(dev)->has_pipe_cxsr)
#define I915_HAS_FBC(dev) (INTEL_INFO(dev)->has_fbc)

#define HAS_PCH_SPLIT(dev) (IS_GEN5(dev) || IS_GEN6(dev))
#define HAS_PIPE_CONTROL(dev) (IS_GEN5(dev) || IS_GEN6(dev))

#define INTEL_PCH_TYPE(dev) (((struct drm_i915_private *)(dev)->dev_private)->pch_type)
#define HAS_PCH_CPT(dev) (INTEL_PCH_TYPE(dev) == PCH_CPT)
#define HAS_PCH_IBX(dev) (INTEL_PCH_TYPE(dev) == PCH_IBX)

#include "i915_trace.h"

extern struct drm_ioctl_desc i915_ioctls[];
extern int i915_max_ioctl;
extern unsigned int i915_fbpercrtc;
extern int i915_panel_ignore_lid;
extern unsigned int i915_powersave;
extern unsigned int i915_semaphores;
extern unsigned int i915_lvds_downclock;
extern unsigned int i915_panel_use_ssc;
extern int i915_vbt_sdvo_panel_type;
extern unsigned int i915_enable_rc6;

extern int i915_suspend(struct drm_device *dev, pm_message_t state);
extern int i915_resume(struct drm_device *dev);
extern void i915_save_display(struct drm_device *dev);
extern void i915_restore_display(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_dma.c */
extern void i915_kernel_lost_context(struct drm_device * dev);
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_priv);
extern void i915_driver_lastclose(struct drm_device * dev);
extern void i915_driver_preclose(struct drm_device *dev,
                                 struct drm_file *file_priv);
extern void i915_driver_postclose(struct drm_device *dev,
                                  struct drm_file *file_priv);
extern int i915_driver_device_is_agp(struct drm_device * dev);
extern long i915_compat_ioctl(struct file *filp, unsigned int cmd,
                              unsigned long arg);
extern int i915_emit_box(struct drm_device *dev,
                         struct drm_clip_rect *box,
                         int DR1, int DR4);
extern int i915_reset(struct drm_device *dev, u8 flags);
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);


/* i915_irq.c */
void i915_hangcheck_elapsed(unsigned long data);
void i915_handle_error(struct drm_device *dev, bool wedged);
extern int i915_irq_emit(struct drm_device *dev, void *data,
                         struct drm_file *file_priv);
extern int i915_irq_wait(struct drm_device *dev, void *data,
                         struct drm_file *file_priv);

extern irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS);
extern void i915_driver_irq_preinstall(struct drm_device * dev);
extern int i915_driver_irq_postinstall(struct drm_device *dev);
extern void i915_driver_irq_uninstall(struct drm_device * dev);
extern int i915_vblank_pipe_set(struct drm_device *dev, void *data,
                                struct drm_file *file_priv);
extern int i915_vblank_pipe_get(struct drm_device *dev, void *data,
                                struct drm_file *file_priv);
extern int i915_enable_vblank(struct drm_device *dev, int crtc);
extern void i915_disable_vblank(struct drm_device *dev, int crtc);
extern u32 i915_get_vblank_counter(struct drm_device *dev, int crtc);
extern u32 gm45_get_vblank_counter(struct drm_device *dev, int crtc);
extern int i915_vblank_swap(struct drm_device *dev, void *data,
                            struct drm_file *file_priv);

void
i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask);

void
i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask);

void intel_enable_asle (struct drm_device *dev);
int i915_get_vblank_timestamp(struct drm_device *dev, int crtc,
                              int *max_error,
                              struct timeval *vblank_time,
                              unsigned flags);

int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
                             int *vpos, int *hpos);

#ifdef CONFIG_DEBUG_FS
extern void i915_destroy_error_state(struct drm_device *dev);
#else
#define i915_destroy_error_state(x)
#endif


/* i915_mem.c */
extern int i915_mem_alloc(struct drm_device *dev, void *data,
                          struct drm_file *file_priv);
extern int i915_mem_free(struct drm_device *dev, void *data,
                         struct drm_file *file_priv);
extern int i915_mem_init_heap(struct drm_device *dev, void *data,
                              struct drm_file *file_priv);
extern int i915_mem_destroy_heap(struct drm_device *dev, void *data,
                                 struct drm_file *file_priv);
extern void i915_mem_takedown(struct mem_block **heap);
extern void i915_mem_release(struct drm_device * dev,
                             struct drm_file *file_priv, struct mem_block *heap);
/* i915_gem.c */
int i915_gem_init_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
int i915_gem_create_ioctl(struct drm_device *dev, void *data,
                          struct drm_file *file_priv);
int i915_gem_pread_ioctl(struct drm_device *dev, void *data,
                         struct drm_file *file_priv);
int i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
                          struct drm_file *file_priv);
int i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
int i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
int i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv);
int i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
                             struct drm_file *file_priv);
int i915_gem_execbuffer(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
int i915_gem_execbuffer2(struct drm_device *dev, void *data,
                         struct drm_file *file_priv);
int i915_gem_pin_ioctl(struct drm_device *dev, void *data,
                       struct drm_file *file_priv);
int i915_gem_unpin_ioctl(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_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_entervt_ioctl(struct drm_device *dev, void *data,
                           struct drm_file *file_priv);
int i915_gem_leavevt_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_get_aperture_ioctl(struct drm_device *dev, void *data,
                                struct drm_file *file_priv);
void i915_gem_load(struct drm_device *dev);
int i915_gem_init_object(struct drm_gem_object *obj);
int __must_check i915_gem_flush_ring(struct intel_ring_buffer *ring,
                                     uint32_t invalidate_domains,
                                     uint32_t flush_domains);
struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
                                                  size_t size);
void i915_gem_free_object(struct drm_gem_object *obj);
int __must_check i915_gem_object_pin(struct drm_i915_gem_object *obj,
                                     uint32_t alignment,
                                     bool map_and_fenceable);
void i915_gem_object_unpin(struct drm_i915_gem_object *obj);
int __must_check i915_gem_object_unbind(struct drm_i915_gem_object *obj);
void i915_gem_release_mmap(struct drm_i915_gem_object *obj);
void i915_gem_lastclose(struct drm_device *dev);

int __must_check i915_mutex_lock_interruptible(struct drm_device *dev);
int __must_check i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj);
void i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
                                    struct intel_ring_buffer *ring,
                                    u32 seqno);

int i915_gem_dumb_create(struct drm_file *file_priv,
                         struct drm_device *dev,
                         struct drm_mode_create_dumb *args);
int i915_gem_mmap_gtt(struct drm_file *file_priv, struct drm_device *dev,
                      uint32_t handle, uint64_t *offset);
int i915_gem_dumb_destroy(struct drm_file *file_priv, struct drm_device *dev,
                          uint32_t handle);                       
/**
 * 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 u32
i915_gem_next_request_seqno(struct intel_ring_buffer *ring)
{
        drm_i915_private_t *dev_priv = ring->dev->dev_private;
        return ring->outstanding_lazy_request = dev_priv->next_seqno;
}

int __must_check i915_gem_object_get_fence(struct drm_i915_gem_object *obj,
                                           struct intel_ring_buffer *pipelined);
int __must_check i915_gem_object_put_fence(struct drm_i915_gem_object *obj);

void i915_gem_retire_requests(struct drm_device *dev);
void i915_gem_reset(struct drm_device *dev);
void i915_gem_clflush_object(struct drm_i915_gem_object *obj);
int __must_check i915_gem_object_set_domain(struct drm_i915_gem_object *obj,
                                            uint32_t read_domains,
                                            uint32_t write_domain);
int __must_check i915_gem_object_flush_gpu(struct drm_i915_gem_object *obj);
int __must_check i915_gem_init_ringbuffer(struct drm_device *dev);
void i915_gem_cleanup_ringbuffer(struct drm_device *dev);
void i915_gem_do_init(struct drm_device *dev,
                      unsigned long start,
                      unsigned long mappable_end,
                      unsigned long end);
int __must_check i915_gpu_idle(struct drm_device *dev);
int __must_check i915_gem_idle(struct drm_device *dev);
int __must_check i915_add_request(struct intel_ring_buffer *ring,
                                  struct drm_file *file,
                                  struct drm_i915_gem_request *request);
int __must_check i915_wait_request(struct intel_ring_buffer *ring,
                                   uint32_t seqno);
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_display_plane(struct drm_i915_gem_object *obj,
                                     struct intel_ring_buffer *pipelined);
int i915_gem_attach_phys_object(struct drm_device *dev,
                                struct drm_i915_gem_object *obj,
                                int id,
                                int align);
void i915_gem_detach_phys_object(struct drm_device *dev,
                                 struct drm_i915_gem_object *obj);
void i915_gem_free_all_phys_object(struct drm_device *dev);
void i915_gem_release(struct drm_device *dev, struct drm_file *file);

uint32_t
i915_gem_get_unfenced_gtt_alignment(struct drm_i915_gem_object *obj);

/* i915_gem_gtt.c */
void i915_gem_restore_gtt_mappings(struct drm_device *dev);
int __must_check i915_gem_gtt_bind_object(struct drm_i915_gem_object *obj);
void i915_gem_gtt_unbind_object(struct drm_i915_gem_object *obj);

/* i915_gem_evict.c */
int __must_check i915_gem_evict_something(struct drm_device *dev, int min_size,
                                          unsigned alignment, bool mappable);
int __must_check i915_gem_evict_everything(struct drm_device *dev,
                                           bool purgeable_only);
int __must_check i915_gem_evict_inactive(struct drm_device *dev,
                                         bool purgeable_only);

/* i915_gem_tiling.c */
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 */
void i915_gem_dump_object(struct drm_i915_gem_object *obj, int len,
                          const char *where, uint32_t mark);
#if WATCH_LISTS
int i915_verify_lists(struct drm_device *dev);
#else
#define i915_verify_lists(dev) 0
#endif
void i915_gem_object_check_coherency(struct drm_i915_gem_object *obj,
                                     int handle);
void i915_gem_dump_object(struct drm_i915_gem_object *obj, int len,
                          const char *where, uint32_t mark);

/* i915_debugfs.c */
int i915_debugfs_init(struct drm_minor *minor);
void i915_debugfs_cleanup(struct drm_minor *minor);

/* i915_suspend.c */
extern int i915_save_state(struct drm_device *dev);
extern int i915_restore_state(struct drm_device *dev);

/* i915_suspend.c */
extern int i915_save_state(struct drm_device *dev);
extern int i915_restore_state(struct drm_device *dev);

/* intel_i2c.c */
extern int intel_setup_gmbus(struct drm_device *dev);
extern void intel_teardown_gmbus(struct drm_device *dev);
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);
extern 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 */
extern int intel_opregion_setup(struct drm_device *dev);
#ifdef CONFIG_ACPI
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 void intel_opregion_gse_intr(struct drm_device *dev);
extern void intel_opregion_enable_asle(struct drm_device *dev);
#else
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 void intel_opregion_gse_intr(struct drm_device *dev) { return; }
static inline void intel_opregion_enable_asle(struct drm_device *dev) { return; }
#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(struct drm_device *dev);
extern void intel_modeset_gem_init(struct drm_device *dev);
extern void intel_modeset_cleanup(struct drm_device *dev);
extern int intel_modeset_vga_set_state(struct drm_device *dev, bool state);
extern void i8xx_disable_fbc(struct drm_device *dev);
extern void g4x_disable_fbc(struct drm_device *dev);
extern void ironlake_disable_fbc(struct drm_device *dev);
extern void intel_disable_fbc(struct drm_device *dev);
extern void intel_enable_fbc(struct drm_crtc *crtc, unsigned long interval);
extern bool intel_fbc_enabled(struct drm_device *dev);
extern bool ironlake_set_drps(struct drm_device *dev, u8 val);
extern void ironlake_enable_rc6(struct drm_device *dev);
extern void gen6_set_rps(struct drm_device *dev, u8 val);
extern void intel_detect_pch (struct drm_device *dev);
extern int intel_trans_dp_port_sel (struct drm_crtc *crtc);

/* overlay */
#ifdef CONFIG_DEBUG_FS
extern struct intel_overlay_error_state *intel_overlay_capture_error_state(struct drm_device *dev);
extern void intel_overlay_print_error_state(struct seq_file *m, 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 seq_file *m,
                                            struct drm_device *dev,
                                            struct intel_display_error_state *error);
#endif

#define LP_RING(d) (&((struct drm_i915_private *)(d))->ring[RCS])

#define BEGIN_LP_RING(n) \
        intel_ring_begin(LP_RING(dev_priv), (n))

#define OUT_RING(x) \
        intel_ring_emit(LP_RING(dev_priv), x)

#define ADVANCE_LP_RING() \
        intel_ring_advance(LP_RING(dev_priv))

/**
 * Lock test for when it's just for synchronization of ring access.
 *
 * In that case, we don't need to do it when GEM is initialized as nobody else
 * has access to the ring.
 */
#define RING_LOCK_TEST_WITH_RETURN(dev, file) do {                      \
        if (LP_RING(dev->dev_private)->obj == NULL)                     \
                LOCK_TEST_WITH_RETURN(dev, file);                       \
} while (0)

/* 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);
void __gen6_gt_force_wake_put(struct drm_i915_private *dev_priv);
void __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv);

/* We give fast paths for the really cool registers */
#define NEEDS_FORCE_WAKE(dev_priv, reg) \
        (((dev_priv)->info->gen >= 6) && \
        ((reg) < 0x40000) && \
        ((reg) != FORCEWAKE))

#define __i915_read(x, y) \
static inline u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg) { \
        u##x val = 0; \
        if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
                __gen6_gt_force_wake_get(dev_priv); \
                val = read##y(dev_priv->regs + reg); \
                __gen6_gt_force_wake_put(dev_priv); \
        } else { \
                val = read##y(dev_priv->regs + reg); \
        } \
        trace_i915_reg_rw(false, reg, val, sizeof(val)); \
        return val; \
}
__i915_read(8, b)
__i915_read(16, w)
__i915_read(32, l)
__i915_read(64, q)
#undef __i915_read

#define __i915_write(x, y) \
static inline void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val) { \
        trace_i915_reg_rw(true, reg, val, sizeof(val)); \
        if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
                __gen6_gt_wait_for_fifo(dev_priv); \
        } \
        write##y(val, dev_priv->regs + reg); \
}
__i915_write(8, b)
__i915_write(16, w)
__i915_write(32, l)
__i915_write(64, q)
#undef __i915_write

#define I915_READ8(reg)         i915_read8(dev_priv, (reg))
#define I915_WRITE8(reg, val)   i915_write8(dev_priv, (reg), (val))

#define I915_READ16(reg)        i915_read16(dev_priv, (reg))
#define I915_WRITE16(reg, val)  i915_write16(dev_priv, (reg), (val))
#define I915_READ16_NOTRACE(reg)        readw(dev_priv->regs + (reg))
#define I915_WRITE16_NOTRACE(reg, val)  writew(val, dev_priv->regs + (reg))

#define I915_READ(reg)          i915_read32(dev_priv, (reg))
#define I915_WRITE(reg, val)    i915_write32(dev_priv, (reg), (val))
#define I915_READ_NOTRACE(reg)          readl(dev_priv->regs + (reg))
#define I915_WRITE_NOTRACE(reg, val)    writel(val, dev_priv->regs + (reg))

#define I915_WRITE64(reg, val)  i915_write64(dev_priv, (reg), (val))
#define I915_READ64(reg)        i915_read64(dev_priv, (reg))

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


#endif