/*
 * Copyright © 2014 Intel Corporation
 *
 * 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, sublicense,
 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS 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.
 *
 * Please try to maintain the following order within this file unless it makes
 * sense to do otherwise. From top to bottom:
 * 1. typedefs
 * 2. #defines, and macros
 * 3. structure definitions
 * 4. function prototypes
 *
 * Within each section, please try to order by generation in ascending order,
 * from top to bottom (ie. gen6 on the top, gen8 on the bottom).
 */

#ifndef __I915_GEM_GTT_H__
#define __I915_GEM_GTT_H__

#include <linux/io-mapping.h>
#include <linux/mm.h>
#include <linux/pagevec.h>

#ifdef __DragonFly__
#include <linux/pci.h>
#endif

#include "i915_request.h"
#include "i915_selftest.h"
#include "i915_timeline.h"

#define I915_GTT_PAGE_SIZE_4K   BIT_ULL(12)
#define I915_GTT_PAGE_SIZE_64K  BIT_ULL(16)
#define I915_GTT_PAGE_SIZE_2M   BIT_ULL(21)

#define I915_GTT_PAGE_SIZE I915_GTT_PAGE_SIZE_4K
#define I915_GTT_MAX_PAGE_SIZE I915_GTT_PAGE_SIZE_2M

#define I915_GTT_PAGE_MASK -I915_GTT_PAGE_SIZE

#define I915_GTT_MIN_ALIGNMENT I915_GTT_PAGE_SIZE

#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_file_private;
struct drm_i915_fence_reg;
struct i915_vma;

typedef u32 gen6_pte_t;
typedef u64 gen8_pte_t;
typedef u64 gen8_pde_t;
typedef u64 gen8_ppgtt_pdpe_t;
typedef u64 gen8_ppgtt_pml4e_t;

#define ggtt_total_entries(ggtt) ((ggtt)->vm.total >> PAGE_SHIFT)

/* gen6-hsw has bit 11-4 for physical addr bit 39-32 */
#define GEN6_GTT_ADDR_ENCODE(addr)      ((addr) | (((addr) >> 28) & 0xff0))
#define GEN6_PTE_ADDR_ENCODE(addr)      GEN6_GTT_ADDR_ENCODE(addr)
#define GEN6_PDE_ADDR_ENCODE(addr)      GEN6_GTT_ADDR_ENCODE(addr)
#define GEN6_PTE_CACHE_LLC              (2 << 1)
#define GEN6_PTE_UNCACHED               (1 << 1)
#define GEN6_PTE_VALID                  (1 << 0)

#define I915_PTES(pte_len)              ((unsigned int)(PAGE_SIZE / (pte_len)))
#define I915_PTE_MASK(pte_len)          (I915_PTES(pte_len) - 1)
#define I915_PDES                       512
#define I915_PDE_MASK                   (I915_PDES - 1)
#define NUM_PTE(pde_shift)     (1 << (pde_shift - PAGE_SHIFT))

#define GEN6_PTES                       I915_PTES(sizeof(gen6_pte_t))
#define GEN6_PD_SIZE                    (I915_PDES * PAGE_SIZE)
#define GEN6_PD_ALIGN                   (PAGE_SIZE * 16)
#define GEN6_PDE_SHIFT                  22
#define GEN6_PDE_VALID                  (1 << 0)

#define GEN7_PTE_CACHE_L3_LLC           (3 << 1)

#define BYT_PTE_SNOOPED_BY_CPU_CACHES   (1 << 2)
#define BYT_PTE_WRITEABLE               (1 << 1)

/* Cacheability Control is a 4-bit value. The low three bits are stored in bits
 * 3:1 of the PTE, while the fourth bit is stored in bit 11 of the PTE.
 */
#define HSW_CACHEABILITY_CONTROL(bits)  ((((bits) & 0x7) << 1) | \
                                         (((bits) & 0x8) << (11 - 3)))
#define HSW_WB_LLC_AGE3                 HSW_CACHEABILITY_CONTROL(0x2)
#define HSW_WB_LLC_AGE0                 HSW_CACHEABILITY_CONTROL(0x3)
#define HSW_WB_ELLC_LLC_AGE3            HSW_CACHEABILITY_CONTROL(0x8)
#define HSW_WB_ELLC_LLC_AGE0            HSW_CACHEABILITY_CONTROL(0xb)
#define HSW_WT_ELLC_LLC_AGE3            HSW_CACHEABILITY_CONTROL(0x7)
#define HSW_WT_ELLC_LLC_AGE0            HSW_CACHEABILITY_CONTROL(0x6)
#define HSW_PTE_UNCACHED                (0)
#define HSW_GTT_ADDR_ENCODE(addr)       ((addr) | (((addr) >> 28) & 0x7f0))
#define HSW_PTE_ADDR_ENCODE(addr)       HSW_GTT_ADDR_ENCODE(addr)

/* GEN8 32b style address is defined as a 3 level page table:
 * 31:30 | 29:21 | 20:12 |  11:0
 * PDPE  |  PDE  |  PTE  | offset
 * The difference as compared to normal x86 3 level page table is the PDPEs are
 * programmed via register.
 */
#define GEN8_3LVL_PDPES                 4
#define GEN8_PDE_SHIFT                  21
#define GEN8_PDE_MASK                   0x1ff
#define GEN8_PTE_SHIFT                  12
#define GEN8_PTE_MASK                   0x1ff
#define GEN8_PTES                       I915_PTES(sizeof(gen8_pte_t))

/* GEN8 48b style address is defined as a 4 level page table:
 * 47:39 | 38:30 | 29:21 | 20:12 |  11:0
 * PML4E | PDPE  |  PDE  |  PTE  | offset
 */
#define GEN8_PML4ES_PER_PML4            512
#define GEN8_PML4E_SHIFT                39
#define GEN8_PML4E_MASK                 (GEN8_PML4ES_PER_PML4 - 1)
#define GEN8_PDPE_SHIFT                 30
/* NB: GEN8_PDPE_MASK is untrue for 32b platforms, but it has no impact on 32b page
 * tables */
#define GEN8_PDPE_MASK                  0x1ff

#define PPAT_UNCACHED                   (_PAGE_PWT | _PAGE_PCD)
#define PPAT_CACHED_PDE                 0 /* WB LLC */
#define PPAT_CACHED                     _PAGE_PAT /* WB LLCeLLC */
#define PPAT_DISPLAY_ELLC               _PAGE_PCD /* WT eLLC */

#define CHV_PPAT_SNOOP                  (1<<6)
#define GEN8_PPAT_AGE(x)                ((x)<<4)
#define GEN8_PPAT_LLCeLLC               (3<<2)
#define GEN8_PPAT_LLCELLC               (2<<2)
#define GEN8_PPAT_LLC                   (1<<2)
#define GEN8_PPAT_WB                    (3<<0)
#define GEN8_PPAT_WT                    (2<<0)
#define GEN8_PPAT_WC                    (1<<0)
#define GEN8_PPAT_UC                    (0<<0)
#define GEN8_PPAT_ELLC_OVERRIDE         (0<<2)
#define GEN8_PPAT(i, x)                 ((u64)(x) << ((i) * 8))

#define GEN8_PPAT_GET_CA(x) ((x) & 3)
#define GEN8_PPAT_GET_TC(x) ((x) & (3 << 2))
#define GEN8_PPAT_GET_AGE(x) ((x) & (3 << 4))
#define CHV_PPAT_GET_SNOOP(x) ((x) & (1 << 6))

#define GEN8_PDE_IPS_64K BIT(11)
#define GEN8_PDE_PS_2M   BIT(7)

struct sg_table;

struct intel_rotation_info {
        struct intel_rotation_plane_info {
                /* tiles */
                unsigned int width, height, stride, offset;
        } plane[2];
} __packed;

struct intel_partial_info {
        u64 offset;
        unsigned int size;
} __packed;

enum i915_ggtt_view_type {
        I915_GGTT_VIEW_NORMAL = 0,
        I915_GGTT_VIEW_ROTATED = sizeof(struct intel_rotation_info),
        I915_GGTT_VIEW_PARTIAL = sizeof(struct intel_partial_info),
};

static inline void assert_i915_gem_gtt_types(void)
{
        BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 8*sizeof(unsigned int));
        BUILD_BUG_ON(sizeof(struct intel_partial_info) != sizeof(u64) + sizeof(unsigned int));

        /* As we encode the size of each branch inside the union into its type,
         * we have to be careful that each branch has a unique size.
         */
        switch ((enum i915_ggtt_view_type)0) {
        case I915_GGTT_VIEW_NORMAL:
        case I915_GGTT_VIEW_PARTIAL:
        case I915_GGTT_VIEW_ROTATED:
                /* gcc complains if these are identical cases */
                break;
        }
}

struct i915_ggtt_view {
        enum i915_ggtt_view_type type;
        union {
                /* Members need to contain no holes/padding */
                struct intel_partial_info partial;
                struct intel_rotation_info rotated;
        };
};

enum i915_cache_level;

struct i915_vma;

struct i915_page_dma {
        struct page *page;
        int order;
        union {
                dma_addr_t daddr;

                /* For gen6/gen7 only. This is the offset in the GGTT
                 * where the page directory entries for PPGTT begin
                 */
                u32 ggtt_offset;
        };
};

#define px_base(px) (&(px)->base)
#define px_dma(px) (px_base(px)->daddr)

struct i915_page_table {
        struct i915_page_dma base;
        unsigned int used_ptes;
};

struct i915_page_directory {
        struct i915_page_dma base;

        struct i915_page_table *page_table[I915_PDES]; /* PDEs */
        unsigned int used_pdes;
};

struct i915_page_directory_pointer {
        struct i915_page_dma base;
        struct i915_page_directory **page_directory;
        unsigned int used_pdpes;
};

struct i915_pml4 {
        struct i915_page_dma base;
        struct i915_page_directory_pointer *pdps[GEN8_PML4ES_PER_PML4];
};

struct i915_vma_ops {
        /* Map an object into an address space with the given cache flags. */
        int (*bind_vma)(struct i915_vma *vma,
                        enum i915_cache_level cache_level,
                        u32 flags);
        /*
         * Unmap an object from an address space. This usually consists of
         * setting the valid PTE entries to a reserved scratch page.
         */
        void (*unbind_vma)(struct i915_vma *vma);

        int (*set_pages)(struct i915_vma *vma);
        void (*clear_pages)(struct i915_vma *vma);
};

struct pagestash {
        spinlock_t lock;
        struct pagevec pvec;
};

struct i915_address_space {
        struct drm_mm mm;
        struct drm_i915_private *i915;
        struct device *dma;
        /* Every address space belongs to a struct file - except for the global
         * GTT that is owned by the driver (and so @file is set to NULL). In
         * principle, no information should leak from one context to another
         * (or between files/processes etc) unless explicitly shared by the
         * owner. Tracking the owner is important in order to free up per-file
         * objects along with the file, to aide resource tracking, and to
         * assign blame.
         */
        struct drm_i915_file_private *file;
        u64 total;              /* size addr space maps (ex. 2GB for ggtt) */
        u64 reserved;           /* size addr space reserved */

        bool closed;

        struct lock mutex; /* protects vma and our lists */

        struct i915_page_dma scratch_page;
        struct i915_page_table *scratch_pt;
        struct i915_page_directory *scratch_pd;
        struct i915_page_directory_pointer *scratch_pdp; /* GEN8+ & 48b PPGTT */

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

        /**
         * LRU list of objects which are not in the ringbuffer and
         * are ready to unbind, but are still in the GTT.
         *
         * last_read_req is NULL 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;

        /**
         * List of vma that have been unbound.
         *
         * A reference is not held on the buffer while on this list.
         */
        struct list_head unbound_list;

        struct pagestash free_pages;

        /* Global GTT */
        bool is_ggtt:1;

        /* Some systems require uncached updates of the page directories */
        bool pt_kmap_wc:1;

        /* Some systems support read-only mappings for GGTT and/or PPGTT */
        bool has_read_only:1;

        /* FIXME: Need a more generic return type */
        gen6_pte_t (*pte_encode)(dma_addr_t addr,
                                 enum i915_cache_level level,
                                 u32 flags); /* Create a valid PTE */
        /* flags for pte_encode */
#define PTE_READ_ONLY   (1<<0)
        int (*allocate_va_range)(struct i915_address_space *vm,
                                 u64 start, u64 length);
        void (*clear_range)(struct i915_address_space *vm,
                            u64 start, u64 length);
        void (*insert_page)(struct i915_address_space *vm,
                            dma_addr_t addr,
                            u64 offset,
                            enum i915_cache_level cache_level,
                            u32 flags);
        void (*insert_entries)(struct i915_address_space *vm,
                               struct i915_vma *vma,
                               enum i915_cache_level cache_level,
                               u32 flags);
        void (*cleanup)(struct i915_address_space *vm);

        struct i915_vma_ops vma_ops;

        I915_SELFTEST_DECLARE(struct fault_attr fault_attr);
        I915_SELFTEST_DECLARE(bool scrub_64K);
};

#define i915_is_ggtt(vm) ((vm)->is_ggtt)

static inline bool
i915_vm_is_48bit(const struct i915_address_space *vm)
{
        return (vm->total - 1) >> 32;
}

static inline bool
i915_vm_has_scratch_64K(struct i915_address_space *vm)
{
        return vm->scratch_page.order == get_order(I915_GTT_PAGE_SIZE_64K);
}

/* The Graphics Translation Table is the way in which GEN hardware translates a
 * Graphics Virtual Address into a Physical Address. In addition to the normal
 * collateral associated with any va->pa translations GEN hardware also has a
 * portion of the GTT which can be mapped by the CPU and remain both coherent
 * and correct (in cases like swizzling). That region is referred to as GMADR in
 * the spec.
 */
struct i915_ggtt {
        struct i915_address_space vm;

        struct io_mapping iomap;        /* Mapping to our CPU mappable region */
        struct linux_resource gmadr;          /* GMADR resource */
        resource_size_t mappable_end;   /* End offset that we can CPU map */

        /** "Graphics Stolen Memory" holds the global PTEs */
        void __iomem *gsm;
        void (*invalidate)(struct drm_i915_private *dev_priv);

        bool do_idle_maps;

        int mtrr;

        u32 pin_bias;

        struct drm_mm_node error_capture;
};

struct i915_hw_ppgtt {
        struct i915_address_space vm;
        struct kref ref;

        unsigned long pd_dirty_rings;
        union {
                struct i915_pml4 pml4;          /* GEN8+ & 48b PPGTT */
                struct i915_page_directory_pointer pdp; /* GEN8+ */
                struct i915_page_directory pd;          /* GEN6-7 */
        };

        void (*debug_dump)(struct i915_hw_ppgtt *ppgtt, struct seq_file *m);
};

struct gen6_hw_ppgtt {
        struct i915_hw_ppgtt base;

        struct i915_vma *vma;
        gen6_pte_t __iomem *pd_addr;
        gen6_pte_t scratch_pte;

        unsigned int pin_count;
        bool scan_for_unused_pt;
};

#define __to_gen6_ppgtt(base) container_of(base, struct gen6_hw_ppgtt, base)

static inline struct gen6_hw_ppgtt *to_gen6_ppgtt(struct i915_hw_ppgtt *base)
{
        BUILD_BUG_ON(offsetof(struct gen6_hw_ppgtt, base));
        return __to_gen6_ppgtt(base);
}

/*
 * gen6_for_each_pde() iterates over every pde from start until start+length.
 * If start and start+length are not perfectly divisible, the macro will round
 * down and up as needed. Start=0 and length=2G effectively iterates over
 * every PDE in the system. The macro modifies ALL its parameters except 'pd',
 * so each of the other parameters should preferably be a simple variable, or
 * at most an lvalue with no side-effects!
 */
#define gen6_for_each_pde(pt, pd, start, length, iter)                  \
        for (iter = gen6_pde_index(start);                              \
             length > 0 && iter < I915_PDES &&                          \
                (pt = (pd)->page_table[iter], true);                    \
             ({ u32 temp = ALIGN(start+1, 1 << GEN6_PDE_SHIFT);         \
                    temp = min(temp - start, length);                   \
                    start += temp, length -= temp; }), ++iter)

#define gen6_for_all_pdes(pt, pd, iter)                                 \
        for (iter = 0;                                                  \
             iter < I915_PDES &&                                        \
                (pt = (pd)->page_table[iter], true);                    \
             ++iter)

static inline u32 i915_pte_index(u64 address, unsigned int pde_shift)
{
        const u32 mask = NUM_PTE(pde_shift) - 1;

        return (address >> PAGE_SHIFT) & mask;
}

/* Helper to counts the number of PTEs within the given length. This count
 * does not cross a page table boundary, so the max value would be
 * GEN6_PTES for GEN6, and GEN8_PTES for GEN8.
*/
static inline u32 i915_pte_count(u64 addr, u64 length, unsigned int pde_shift)
{
        const u64 mask = ~((1ULL << pde_shift) - 1);
        u64 end;

        GEM_BUG_ON(length == 0);
        GEM_BUG_ON(offset_in_page(addr | length));

        end = addr + length;

        if ((addr & mask) != (end & mask))
                return NUM_PTE(pde_shift) - i915_pte_index(addr, pde_shift);

        return i915_pte_index(end, pde_shift) - i915_pte_index(addr, pde_shift);
}

static inline u32 i915_pde_index(u64 addr, u32 shift)
{
        return (addr >> shift) & I915_PDE_MASK;
}

static inline u32 gen6_pte_index(u32 addr)
{
        return i915_pte_index(addr, GEN6_PDE_SHIFT);
}

static inline u32 gen6_pte_count(u32 addr, u32 length)
{
        return i915_pte_count(addr, length, GEN6_PDE_SHIFT);
}

static inline u32 gen6_pde_index(u32 addr)
{
        return i915_pde_index(addr, GEN6_PDE_SHIFT);
}

static inline unsigned int
i915_pdpes_per_pdp(const struct i915_address_space *vm)
{
        if (i915_vm_is_48bit(vm))
                return GEN8_PML4ES_PER_PML4;

        return GEN8_3LVL_PDPES;
}

/* Equivalent to the gen6 version, For each pde iterates over every pde
 * between from start until start + length. On gen8+ it simply iterates
 * over every page directory entry in a page directory.
 */
#define gen8_for_each_pde(pt, pd, start, length, iter)                  \
        for (iter = gen8_pde_index(start);                              \
             length > 0 && iter < I915_PDES &&                          \
                (pt = (pd)->page_table[iter], true);                    \
             ({ u64 temp = ALIGN(start+1, 1 << GEN8_PDE_SHIFT);         \
                    temp = min(temp - start, length);                   \
                    start += temp, length -= temp; }), ++iter)

#define gen8_for_each_pdpe(pd, pdp, start, length, iter)                \
        for (iter = gen8_pdpe_index(start);                             \
             length > 0 && iter < i915_pdpes_per_pdp(vm) &&             \
                (pd = (pdp)->page_directory[iter], true);               \
             ({ u64 temp = ALIGN(start+1, 1 << GEN8_PDPE_SHIFT);        \
                    temp = min(temp - start, length);                   \
                    start += temp, length -= temp; }), ++iter)

#define gen8_for_each_pml4e(pdp, pml4, start, length, iter)             \
        for (iter = gen8_pml4e_index(start);                            \
             length > 0 && iter < GEN8_PML4ES_PER_PML4 &&               \
                (pdp = (pml4)->pdps[iter], true);                       \
             ({ u64 temp = ALIGN(start+1, 1ULL << GEN8_PML4E_SHIFT);    \
                    temp = min(temp - start, length);                   \
                    start += temp, length -= temp; }), ++iter)

static inline u32 gen8_pte_index(u64 address)
{
        return i915_pte_index(address, GEN8_PDE_SHIFT);
}

static inline u32 gen8_pde_index(u64 address)
{
        return i915_pde_index(address, GEN8_PDE_SHIFT);
}

static inline u32 gen8_pdpe_index(u64 address)
{
        return (address >> GEN8_PDPE_SHIFT) & GEN8_PDPE_MASK;
}

static inline u32 gen8_pml4e_index(u64 address)
{
        return (address >> GEN8_PML4E_SHIFT) & GEN8_PML4E_MASK;
}

static inline u64 gen8_pte_count(u64 address, u64 length)
{
        return i915_pte_count(address, length, GEN8_PDE_SHIFT);
}

static inline dma_addr_t
i915_page_dir_dma_addr(const struct i915_hw_ppgtt *ppgtt, const unsigned n)
{
        return px_dma(ppgtt->pdp.page_directory[n]);
}

static inline struct i915_ggtt *
i915_vm_to_ggtt(struct i915_address_space *vm)
{
        GEM_BUG_ON(!i915_is_ggtt(vm));
        return container_of(vm, struct i915_ggtt, vm);
}

#define INTEL_MAX_PPAT_ENTRIES 8
#define INTEL_PPAT_PERFECT_MATCH (~0U)

struct intel_ppat;

struct intel_ppat_entry {
        struct intel_ppat *ppat;
        struct kref ref;
        u8 value;
};

struct intel_ppat {
        struct intel_ppat_entry entries[INTEL_MAX_PPAT_ENTRIES];
        DECLARE_BITMAP(used, INTEL_MAX_PPAT_ENTRIES);
        DECLARE_BITMAP(dirty, INTEL_MAX_PPAT_ENTRIES);
        unsigned int max_entries;
        u8 clear_value;
        /*
         * Return a score to show how two PPAT values match,
         * a INTEL_PPAT_PERFECT_MATCH indicates a perfect match
         */
        unsigned int (*match)(u8 src, u8 dst);
        void (*update_hw)(struct drm_i915_private *i915);

        struct drm_i915_private *i915;
};

const struct intel_ppat_entry *
intel_ppat_get(struct drm_i915_private *i915, u8 value);
void intel_ppat_put(const struct intel_ppat_entry *entry);

int i915_gem_init_aliasing_ppgtt(struct drm_i915_private *i915);
void i915_gem_fini_aliasing_ppgtt(struct drm_i915_private *i915);

int i915_ggtt_probe_hw(struct drm_i915_private *dev_priv);
int i915_ggtt_init_hw(struct drm_i915_private *dev_priv);
int i915_ggtt_enable_hw(struct drm_i915_private *dev_priv);
void i915_ggtt_enable_guc(struct drm_i915_private *i915);
void i915_ggtt_disable_guc(struct drm_i915_private *i915);
int i915_gem_init_ggtt(struct drm_i915_private *dev_priv);
void i915_ggtt_cleanup_hw(struct drm_i915_private *dev_priv);

int i915_ppgtt_init_hw(struct drm_i915_private *dev_priv);
void i915_ppgtt_release(struct kref *kref);
struct i915_hw_ppgtt *i915_ppgtt_create(struct drm_i915_private *dev_priv,
                                        struct drm_i915_file_private *fpriv);
void i915_ppgtt_close(struct i915_address_space *vm);
static inline void i915_ppgtt_get(struct i915_hw_ppgtt *ppgtt)
{
        if (ppgtt)
                kref_get(&ppgtt->ref);
}
static inline void i915_ppgtt_put(struct i915_hw_ppgtt *ppgtt)
{
        if (ppgtt)
                kref_put(&ppgtt->ref, i915_ppgtt_release);
}

int gen6_ppgtt_pin(struct i915_hw_ppgtt *base);
void gen6_ppgtt_unpin(struct i915_hw_ppgtt *base);

void i915_check_and_clear_faults(struct drm_i915_private *dev_priv);
void i915_gem_suspend_gtt_mappings(struct drm_i915_private *dev_priv);
void i915_gem_restore_gtt_mappings(struct drm_i915_private *dev_priv);

int __must_check i915_gem_gtt_prepare_pages(struct drm_i915_gem_object *obj,
                                            struct sg_table *pages);
void i915_gem_gtt_finish_pages(struct drm_i915_gem_object *obj,
                               struct sg_table *pages);

int i915_gem_gtt_reserve(struct i915_address_space *vm,
                         struct drm_mm_node *node,
                         u64 size, u64 offset, unsigned long color,
                         unsigned int flags);

int i915_gem_gtt_insert(struct i915_address_space *vm,
                        struct drm_mm_node *node,
                        u64 size, u64 alignment, unsigned long color,
                        u64 start, u64 end, unsigned int flags);

/* Flags used by pin/bind&friends. */
#define PIN_NONBLOCK            BIT_ULL(0)
#define PIN_MAPPABLE            BIT_ULL(1)
#define PIN_ZONE_4G             BIT_ULL(2)
#define PIN_NONFAULT            BIT_ULL(3)
#define PIN_NOEVICT             BIT_ULL(4)

#define PIN_MBZ                 BIT_ULL(5) /* I915_VMA_PIN_OVERFLOW */
#define PIN_GLOBAL              BIT_ULL(6) /* I915_VMA_GLOBAL_BIND */
#define PIN_USER                BIT_ULL(7) /* I915_VMA_LOCAL_BIND */
#define PIN_UPDATE              BIT_ULL(8)

#define PIN_HIGH                BIT_ULL(9)
#define PIN_OFFSET_BIAS         BIT_ULL(10)
#define PIN_OFFSET_FIXED        BIT_ULL(11)
#define PIN_OFFSET_MASK         (-I915_GTT_PAGE_SIZE)

#endif