drm/vmwgfx: Protect from excessive execbuf kernel memory allocations v3

[thirdparty/linux.git] / drivers / gpu / drm / vmwgfx / vmwgfx_drv.h

/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/**************************************************************************
 *
 * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
 *
 * 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
 * THE COPYRIGHT HOLDERS, AUTHORS 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
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#ifndef _VMWGFX_DRV_H_
#define _VMWGFX_DRV_H_

#include "vmwgfx_validation.h"
#include "vmwgfx_reg.h"
#include <drm/drmP.h>
#include <drm/vmwgfx_drm.h>
#include <drm/drm_hashtab.h>
#include <drm/drm_auth.h>
#include <linux/suspend.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <drm/ttm/ttm_execbuf_util.h>
#include <drm/ttm/ttm_module.h>
#include "vmwgfx_fence.h"
#include "ttm_object.h"
#include "ttm_lock.h"
#include <linux/sync_file.h>

#define VMWGFX_DRIVER_NAME "vmwgfx"
#define VMWGFX_DRIVER_DATE "20180704"
#define VMWGFX_DRIVER_MAJOR 2
#define VMWGFX_DRIVER_MINOR 15
#define VMWGFX_DRIVER_PATCHLEVEL 0
#define VMWGFX_FILE_PAGE_OFFSET 0x00100000
#define VMWGFX_FIFO_STATIC_SIZE (1024*1024)
#define VMWGFX_MAX_RELOCATIONS 2048
#define VMWGFX_MAX_VALIDATIONS 2048
#define VMWGFX_MAX_DISPLAYS 16
#define VMWGFX_CMD_BOUNCE_INIT_SIZE 32768
#define VMWGFX_ENABLE_SCREEN_TARGET_OTABLE 1

/*
 * Perhaps we should have sysfs entries for these.
 */
#define VMWGFX_NUM_GB_CONTEXT 256
#define VMWGFX_NUM_GB_SHADER 20000
#define VMWGFX_NUM_GB_SURFACE 32768
#define VMWGFX_NUM_GB_SCREEN_TARGET VMWGFX_MAX_DISPLAYS
#define VMWGFX_NUM_DXCONTEXT 256
#define VMWGFX_NUM_DXQUERY 512
#define VMWGFX_NUM_MOB (VMWGFX_NUM_GB_CONTEXT +\
                        VMWGFX_NUM_GB_SHADER +\
                        VMWGFX_NUM_GB_SURFACE +\
                        VMWGFX_NUM_GB_SCREEN_TARGET)

#define VMW_PL_GMR (TTM_PL_PRIV + 0)
#define VMW_PL_FLAG_GMR (TTM_PL_FLAG_PRIV << 0)
#define VMW_PL_MOB (TTM_PL_PRIV + 1)
#define VMW_PL_FLAG_MOB (TTM_PL_FLAG_PRIV << 1)

#define VMW_RES_CONTEXT ttm_driver_type0
#define VMW_RES_SURFACE ttm_driver_type1
#define VMW_RES_STREAM ttm_driver_type2
#define VMW_RES_FENCE ttm_driver_type3
#define VMW_RES_SHADER ttm_driver_type4

struct vmw_fpriv {
        struct drm_master *locked_master;
        struct ttm_object_file *tfile;
        bool gb_aware; /* user-space is guest-backed aware */
};

struct vmw_buffer_object {
        struct ttm_buffer_object base;
        struct list_head res_list;
        s32 pin_count;
        /* Not ref-counted.  Protected by binding_mutex */
        struct vmw_resource *dx_query_ctx;
        /* Protected by reservation */
        struct ttm_bo_kmap_obj map;
};

/**
 * struct vmw_validate_buffer - Carries validation info about buffers.
 *
 * @base: Validation info for TTM.
 * @hash: Hash entry for quick lookup of the TTM buffer object.
 *
 * This structure contains also driver private validation info
 * on top of the info needed by TTM.
 */
struct vmw_validate_buffer {
        struct ttm_validate_buffer base;
        struct drm_hash_item hash;
        bool validate_as_mob;
};

struct vmw_res_func;


/**
 * struct vmw-resource - base class for hardware resources
 *
 * @kref: For refcounting.
 * @dev_priv: Pointer to the device private for this resource. Immutable.
 * @id: Device id. Protected by @dev_priv::resource_lock.
 * @backup_size: Backup buffer size. Immutable.
 * @res_dirty: Resource contains data not yet in the backup buffer. Protected
 * by resource reserved.
 * @backup_dirty: Backup buffer contains data not yet in the HW resource.
 * Protecte by resource reserved.
 * @backup: The backup buffer if any. Protected by resource reserved.
 * @backup_offset: Offset into the backup buffer if any. Protected by resource
 * reserved. Note that only a few resource types can have a @backup_offset
 * different from zero.
 * @pin_count: The pin count for this resource. A pinned resource has a
 * pin-count greater than zero. It is not on the resource LRU lists and its
 * backup buffer is pinned. Hence it can't be evicted.
 * @func: Method vtable for this resource. Immutable.
 * @lru_head: List head for the LRU list. Protected by @dev_priv::resource_lock.
 * @mob_head: List head for the MOB backup list. Protected by @backup reserved.
 * @binding_head: List head for the context binding list. Protected by
 * the @dev_priv::binding_mutex
 * @res_free: The resource destructor.
 * @hw_destroy: Callback to destroy the resource on the device, as part of
 * resource destruction.
 */
struct vmw_resource {
        struct kref kref;
        struct vmw_private *dev_priv;
        int id;
        unsigned long backup_size;
        bool res_dirty;
        bool backup_dirty;
        struct vmw_buffer_object *backup;
        unsigned long backup_offset;
        unsigned long pin_count;
        const struct vmw_res_func *func;
        struct list_head lru_head;
        struct list_head mob_head;
        struct list_head binding_head;
        void (*res_free) (struct vmw_resource *res);
        void (*hw_destroy) (struct vmw_resource *res);
};


/*
 * Resources that are managed using ioctls.
 */
enum vmw_res_type {
        vmw_res_context,
        vmw_res_surface,
        vmw_res_stream,
        vmw_res_shader,
        vmw_res_dx_context,
        vmw_res_cotable,
        vmw_res_view,
        vmw_res_max
};

/*
 * Resources that are managed using command streams.
 */
enum vmw_cmdbuf_res_type {
        vmw_cmdbuf_res_shader,
        vmw_cmdbuf_res_view
};

struct vmw_cmdbuf_res_manager;

struct vmw_cursor_snooper {
        size_t age;
        uint32_t *image;
};

struct vmw_framebuffer;
struct vmw_surface_offset;

struct vmw_surface {
        struct vmw_resource res;
        SVGA3dSurfaceAllFlags flags;
        uint32_t format;
        uint32_t mip_levels[DRM_VMW_MAX_SURFACE_FACES];
        struct drm_vmw_size base_size;
        struct drm_vmw_size *sizes;
        uint32_t num_sizes;
        bool scanout;
        uint32_t array_size;
        /* TODO so far just a extra pointer */
        struct vmw_cursor_snooper snooper;
        struct vmw_surface_offset *offsets;
        SVGA3dTextureFilter autogen_filter;
        uint32_t multisample_count;
        struct list_head view_list;
        SVGA3dMSPattern multisample_pattern;
        SVGA3dMSQualityLevel quality_level;
};

struct vmw_marker_queue {
        struct list_head head;
        u64 lag;
        u64 lag_time;
        spinlock_t lock;
};

struct vmw_fifo_state {
        unsigned long reserved_size;
        u32 *dynamic_buffer;
        u32 *static_buffer;
        unsigned long static_buffer_size;
        bool using_bounce_buffer;
        uint32_t capabilities;
        struct mutex fifo_mutex;
        struct rw_semaphore rwsem;
        struct vmw_marker_queue marker_queue;
        bool dx;
};

/**
 * struct vmw_res_cache_entry - resource information cache entry
 * @handle: User-space handle of a resource.
 * @res: Non-ref-counted pointer to the resource.
 * @valid_handle: Whether the @handle member is valid.
 * @valid: Whether the entry is valid, which also implies that the execbuf
 * code holds a reference to the resource, and it's placed on the
 * validation list.
 *
 * Used to avoid frequent repeated user-space handle lookups of the
 * same resource.
 */
struct vmw_res_cache_entry {
        uint32_t handle;
        struct vmw_resource *res;
        void *private;
        unsigned short valid_handle;
        unsigned short valid;
};

/**
 * enum vmw_dma_map_mode - indicate how to perform TTM page dma mappings.
 */
enum vmw_dma_map_mode {
        vmw_dma_phys,           /* Use physical page addresses */
        vmw_dma_alloc_coherent, /* Use TTM coherent pages */
        vmw_dma_map_populate,   /* Unmap from DMA just after unpopulate */
        vmw_dma_map_bind,       /* Unmap from DMA just before unbind */
        vmw_dma_map_max
};

/**
 * struct vmw_sg_table - Scatter/gather table for binding, with additional
 * device-specific information.
 *
 * @sgt: Pointer to a struct sg_table with binding information
 * @num_regions: Number of regions with device-address contiguous pages
 */
struct vmw_sg_table {
        enum vmw_dma_map_mode mode;
        struct page **pages;
        const dma_addr_t *addrs;
        struct sg_table *sgt;
        unsigned long num_regions;
        unsigned long num_pages;
};

/**
 * struct vmw_piter - Page iterator that iterates over a list of pages
 * and DMA addresses that could be either a scatter-gather list or
 * arrays
 *
 * @pages: Array of page pointers to the pages.
 * @addrs: DMA addresses to the pages if coherent pages are used.
 * @iter: Scatter-gather page iterator. Current position in SG list.
 * @i: Current position in arrays.
 * @num_pages: Number of pages total.
 * @next: Function to advance the iterator. Returns false if past the list
 * of pages, true otherwise.
 * @dma_address: Function to return the DMA address of the current page.
 */
struct vmw_piter {
        struct page **pages;
        const dma_addr_t *addrs;
        struct sg_page_iter iter;
        unsigned long i;
        unsigned long num_pages;
        bool (*next)(struct vmw_piter *);
        dma_addr_t (*dma_address)(struct vmw_piter *);
        struct page *(*page)(struct vmw_piter *);
};

/*
 * enum vmw_display_unit_type - Describes the display unit
 */
enum vmw_display_unit_type {
        vmw_du_invalid = 0,
        vmw_du_legacy,
        vmw_du_screen_object,
        vmw_du_screen_target
};

struct vmw_validation_context;
struct vmw_ctx_validation_info;

/**
 * struct vmw_sw_context - Command submission context
 * @res_ht: Pointer hash table used to find validation duplicates
 * @kernel: Whether the command buffer originates from kernel code rather
 * than from user-space
 * @fp: If @kernel is false, points to the file of the client. Otherwise
 * NULL
 * @cmd_bounce: Command bounce buffer used for command validation before
 * copying to fifo space
 * @cmd_bounce_size: Current command bounce buffer size
 * @cur_query_bo: Current buffer object used as query result buffer
 * @bo_relocations: List of buffer object relocations
 * @res_relocations: List of resource relocations
 * @buf_start: Pointer to start of memory where command validation takes
 * place
 * @res_cache: Cache of recently looked up resources
 * @last_query_ctx: Last context that submitted a query
 * @needs_post_query_barrier: Whether a query barrier is needed after
 * command submission
 * @staged_bindings: Cached per-context binding tracker
 * @staged_bindings_inuse: Whether the cached per-context binding tracker
 * is in use
 * @staged_cmd_res: List of staged command buffer managed resources in this
 * command buffer
 * @ctx_list: List of context resources referenced in this command buffer
 * @dx_ctx_node: Validation metadata of the current DX context
 * @dx_query_mob: The MOB used for DX queries
 * @dx_query_ctx: The DX context used for the last DX query
 * @man: Pointer to the command buffer managed resource manager
 * @ctx: The validation context
 */
struct vmw_sw_context{
        struct drm_open_hash res_ht;
        bool res_ht_initialized;
        bool kernel;
        struct vmw_fpriv *fp;
        uint32_t *cmd_bounce;
        uint32_t cmd_bounce_size;
        struct vmw_buffer_object *cur_query_bo;
        struct list_head bo_relocations;
        struct list_head res_relocations;
        uint32_t *buf_start;
        struct vmw_res_cache_entry res_cache[vmw_res_max];
        struct vmw_resource *last_query_ctx;
        bool needs_post_query_barrier;
        struct vmw_ctx_binding_state *staged_bindings;
        bool staged_bindings_inuse;
        struct list_head staged_cmd_res;
        struct list_head ctx_list;
        struct vmw_ctx_validation_info *dx_ctx_node;
        struct vmw_buffer_object *dx_query_mob;
        struct vmw_resource *dx_query_ctx;
        struct vmw_cmdbuf_res_manager *man;
        struct vmw_validation_context *ctx;
};

struct vmw_legacy_display;
struct vmw_overlay;

struct vmw_master {
        struct ttm_lock lock;
};

struct vmw_vga_topology_state {
        uint32_t width;
        uint32_t height;
        uint32_t primary;
        uint32_t pos_x;
        uint32_t pos_y;
};


/*
 * struct vmw_otable - Guest Memory OBject table metadata
 *
 * @size:           Size of the table (page-aligned).
 * @page_table:     Pointer to a struct vmw_mob holding the page table.
 */
struct vmw_otable {
        unsigned long size;
        struct vmw_mob *page_table;
        bool enabled;
};

struct vmw_otable_batch {
        unsigned num_otables;
        struct vmw_otable *otables;
        struct vmw_resource *context;
        struct ttm_buffer_object *otable_bo;
};

enum {
        VMW_IRQTHREAD_FENCE,
        VMW_IRQTHREAD_CMDBUF,
        VMW_IRQTHREAD_MAX
};

struct vmw_private {
        struct ttm_bo_device bdev;
        struct ttm_bo_global_ref bo_global_ref;
        struct drm_global_reference mem_global_ref;

        struct vmw_fifo_state fifo;

        struct drm_device *dev;
        unsigned long vmw_chipset;
        unsigned int io_start;
        uint32_t vram_start;
        uint32_t vram_size;
        uint32_t prim_bb_mem;
        uint32_t mmio_start;
        uint32_t mmio_size;
        uint32_t fb_max_width;
        uint32_t fb_max_height;
        uint32_t texture_max_width;
        uint32_t texture_max_height;
        uint32_t stdu_max_width;
        uint32_t stdu_max_height;
        uint32_t initial_width;
        uint32_t initial_height;
        u32 *mmio_virt;
        uint32_t capabilities;
        uint32_t capabilities2;
        uint32_t max_gmr_ids;
        uint32_t max_gmr_pages;
        uint32_t max_mob_pages;
        uint32_t max_mob_size;
        uint32_t memory_size;
        bool has_gmr;
        bool has_mob;
        spinlock_t hw_lock;
        spinlock_t cap_lock;
        bool has_dx;
        bool assume_16bpp;
        bool has_sm4_1;

        /*
         * VGA registers.
         */

        struct vmw_vga_topology_state vga_save[VMWGFX_MAX_DISPLAYS];
        uint32_t vga_width;
        uint32_t vga_height;
        uint32_t vga_bpp;
        uint32_t vga_bpl;
        uint32_t vga_pitchlock;

        uint32_t num_displays;

        /*
         * Currently requested_layout_mutex is used to protect the gui
         * positionig state in display unit. With that use case currently this
         * mutex is only taken during layout ioctl and atomic check_modeset.
         * Other display unit state can be protected with this mutex but that
         * needs careful consideration.
         */
        struct mutex requested_layout_mutex;

        /*
         * Framebuffer info.
         */

        void *fb_info;
        enum vmw_display_unit_type active_display_unit;
        struct vmw_legacy_display *ldu_priv;
        struct vmw_overlay *overlay_priv;
        struct drm_property *hotplug_mode_update_property;
        struct drm_property *implicit_placement_property;
        unsigned num_implicit;
        struct vmw_framebuffer *implicit_fb;
        struct mutex global_kms_state_mutex;
        spinlock_t cursor_lock;
        struct drm_atomic_state *suspend_state;

        /*
         * Context and surface management.
         */

        spinlock_t resource_lock;
        struct idr res_idr[vmw_res_max];
        /*
         * Block lastclose from racing with firstopen.
         */

        struct mutex init_mutex;

        /*
         * A resource manager for kernel-only surfaces and
         * contexts.
         */

        struct ttm_object_device *tdev;

        /*
         * Fencing and IRQs.
         */

        atomic_t marker_seq;
        wait_queue_head_t fence_queue;
        wait_queue_head_t fifo_queue;
        spinlock_t waiter_lock;
        int fence_queue_waiters; /* Protected by waiter_lock */
        int goal_queue_waiters; /* Protected by waiter_lock */
        int cmdbuf_waiters; /* Protected by waiter_lock */
        int error_waiters; /* Protected by waiter_lock */
        int fifo_queue_waiters; /* Protected by waiter_lock */
        uint32_t last_read_seqno;
        struct vmw_fence_manager *fman;
        uint32_t irq_mask; /* Updates protected by waiter_lock */

        /*
         * Device state
         */

        uint32_t traces_state;
        uint32_t enable_state;
        uint32_t config_done_state;

        /**
         * Execbuf
         */
        /**
         * Protected by the cmdbuf mutex.
         */

        struct vmw_sw_context ctx;
        struct mutex cmdbuf_mutex;
        struct mutex binding_mutex;

        /**
         * Operating mode.
         */

        bool stealth;
        bool enable_fb;
        spinlock_t svga_lock;

        /**
         * Master management.
         */

        struct vmw_master *active_master;
        struct vmw_master fbdev_master;
        struct notifier_block pm_nb;
        bool refuse_hibernation;
        bool suspend_locked;

        struct mutex release_mutex;
        atomic_t num_fifo_resources;

        /*
         * Replace this with an rwsem as soon as we have down_xx_interruptible()
         */
        struct ttm_lock reservation_sem;

        /*
         * Query processing. These members
         * are protected by the cmdbuf mutex.
         */

        struct vmw_buffer_object *dummy_query_bo;
        struct vmw_buffer_object *pinned_bo;
        uint32_t query_cid;
        uint32_t query_cid_valid;
        bool dummy_query_bo_pinned;

        /*
         * Surface swapping. The "surface_lru" list is protected by the
         * resource lock in order to be able to destroy a surface and take
         * it off the lru atomically. "used_memory_size" is currently
         * protected by the cmdbuf mutex for simplicity.
         */

        struct list_head res_lru[vmw_res_max];
        uint32_t used_memory_size;

        /*
         * DMA mapping stuff.
         */
        enum vmw_dma_map_mode map_mode;

        /*
         * Guest Backed stuff
         */
        struct vmw_otable_batch otable_batch;

        struct vmw_cmdbuf_man *cman;
        DECLARE_BITMAP(irqthread_pending, VMW_IRQTHREAD_MAX);

        /* Validation memory reservation */
        struct vmw_validation_mem vvm;
};

static inline struct vmw_surface *vmw_res_to_srf(struct vmw_resource *res)
{
        return container_of(res, struct vmw_surface, res);
}

static inline struct vmw_private *vmw_priv(struct drm_device *dev)
{
        return (struct vmw_private *)dev->dev_private;
}

static inline struct vmw_fpriv *vmw_fpriv(struct drm_file *file_priv)
{
        return (struct vmw_fpriv *)file_priv->driver_priv;
}

static inline struct vmw_master *vmw_master(struct drm_master *master)
{
        return (struct vmw_master *) master->driver_priv;
}

/*
 * The locking here is fine-grained, so that it is performed once
 * for every read- and write operation. This is of course costly, but we
 * don't perform much register access in the timing critical paths anyway.
 * Instead we have the extra benefit of being sure that we don't forget
 * the hw lock around register accesses.
 */
static inline void vmw_write(struct vmw_private *dev_priv,
                             unsigned int offset, uint32_t value)
{
        spin_lock(&dev_priv->hw_lock);
        outl(offset, dev_priv->io_start + VMWGFX_INDEX_PORT);
        outl(value, dev_priv->io_start + VMWGFX_VALUE_PORT);
        spin_unlock(&dev_priv->hw_lock);
}

static inline uint32_t vmw_read(struct vmw_private *dev_priv,
                                unsigned int offset)
{
        u32 val;

        spin_lock(&dev_priv->hw_lock);
        outl(offset, dev_priv->io_start + VMWGFX_INDEX_PORT);
        val = inl(dev_priv->io_start + VMWGFX_VALUE_PORT);
        spin_unlock(&dev_priv->hw_lock);

        return val;
}

extern void vmw_svga_enable(struct vmw_private *dev_priv);
extern void vmw_svga_disable(struct vmw_private *dev_priv);


/**
 * GMR utilities - vmwgfx_gmr.c
 */

extern int vmw_gmr_bind(struct vmw_private *dev_priv,
                        const struct vmw_sg_table *vsgt,
                        unsigned long num_pages,
                        int gmr_id);
extern void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id);

/**
 * Resource utilities - vmwgfx_resource.c
 */
struct vmw_user_resource_conv;

extern void vmw_resource_unreference(struct vmw_resource **p_res);
extern struct vmw_resource *vmw_resource_reference(struct vmw_resource *res);
extern struct vmw_resource *
vmw_resource_reference_unless_doomed(struct vmw_resource *res);
extern int vmw_resource_validate(struct vmw_resource *res, bool intr);
extern int vmw_resource_reserve(struct vmw_resource *res, bool interruptible,
                                bool no_backup);
extern bool vmw_resource_needs_backup(const struct vmw_resource *res);
extern int vmw_user_lookup_handle(struct vmw_private *dev_priv,
                                  struct ttm_object_file *tfile,
                                  uint32_t handle,
                                  struct vmw_surface **out_surf,
                                  struct vmw_buffer_object **out_buf);
extern int vmw_user_resource_lookup_handle(
        struct vmw_private *dev_priv,
        struct ttm_object_file *tfile,
        uint32_t handle,
        const struct vmw_user_resource_conv *converter,
        struct vmw_resource **p_res);
extern struct vmw_resource *
vmw_user_resource_noref_lookup_handle(struct vmw_private *dev_priv,
                                      struct ttm_object_file *tfile,
                                      uint32_t handle,
                                      const struct vmw_user_resource_conv *
                                      converter);
extern int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
                                  struct drm_file *file_priv);
extern int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
                                  struct drm_file *file_priv);
extern int vmw_user_stream_lookup(struct vmw_private *dev_priv,
                                  struct ttm_object_file *tfile,
                                  uint32_t *inout_id,
                                  struct vmw_resource **out);
extern void vmw_resource_unreserve(struct vmw_resource *res,
                                   bool switch_backup,
                                   struct vmw_buffer_object *new_backup,
                                   unsigned long new_backup_offset);
extern void vmw_query_move_notify(struct ttm_buffer_object *bo,
                                  struct ttm_mem_reg *mem);
extern int vmw_query_readback_all(struct vmw_buffer_object *dx_query_mob);
extern void vmw_resource_evict_all(struct vmw_private *dev_priv);
extern void vmw_resource_unbind_list(struct vmw_buffer_object *vbo);

/**
 * vmw_user_resource_noref_release - release a user resource pointer looked up
 * without reference
 */
static inline void vmw_user_resource_noref_release(void)
{
        ttm_base_object_noref_release();
}

/**
 * Buffer object helper functions - vmwgfx_bo.c
 */
extern int vmw_bo_pin_in_placement(struct vmw_private *vmw_priv,
                                   struct vmw_buffer_object *bo,
                                   struct ttm_placement *placement,
                                   bool interruptible);
extern int vmw_bo_pin_in_vram(struct vmw_private *dev_priv,
                              struct vmw_buffer_object *buf,
                              bool interruptible);
extern int vmw_bo_pin_in_vram_or_gmr(struct vmw_private *dev_priv,
                                     struct vmw_buffer_object *buf,
                                     bool interruptible);
extern int vmw_bo_pin_in_start_of_vram(struct vmw_private *vmw_priv,
                                       struct vmw_buffer_object *bo,
                                       bool interruptible);
extern int vmw_bo_unpin(struct vmw_private *vmw_priv,
                        struct vmw_buffer_object *bo,
                        bool interruptible);
extern void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *buf,
                                 SVGAGuestPtr *ptr);
extern void vmw_bo_pin_reserved(struct vmw_buffer_object *bo, bool pin);
extern void vmw_bo_bo_free(struct ttm_buffer_object *bo);
extern int vmw_bo_init(struct vmw_private *dev_priv,
                       struct vmw_buffer_object *vmw_bo,
                       size_t size, struct ttm_placement *placement,
                       bool interuptable,
                       void (*bo_free)(struct ttm_buffer_object *bo));
extern int vmw_user_bo_verify_access(struct ttm_buffer_object *bo,
                                     struct ttm_object_file *tfile);
extern int vmw_user_bo_alloc(struct vmw_private *dev_priv,
                             struct ttm_object_file *tfile,
                             uint32_t size,
                             bool shareable,
                             uint32_t *handle,
                             struct vmw_buffer_object **p_dma_buf,
                             struct ttm_base_object **p_base);
extern int vmw_user_bo_reference(struct ttm_object_file *tfile,
                                 struct vmw_buffer_object *dma_buf,
                                 uint32_t *handle);
extern int vmw_bo_alloc_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv);
extern int vmw_bo_unref_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv);
extern int vmw_user_bo_synccpu_ioctl(struct drm_device *dev, void *data,
                                     struct drm_file *file_priv);
extern int vmw_user_bo_lookup(struct ttm_object_file *tfile,
                              uint32_t id, struct vmw_buffer_object **out,
                              struct ttm_base_object **base);
extern void vmw_bo_fence_single(struct ttm_buffer_object *bo,
                                struct vmw_fence_obj *fence);
extern void *vmw_bo_map_and_cache(struct vmw_buffer_object *vbo);
extern void vmw_bo_unmap(struct vmw_buffer_object *vbo);
extern void vmw_bo_move_notify(struct ttm_buffer_object *bo,
                               struct ttm_mem_reg *mem);
extern void vmw_bo_swap_notify(struct ttm_buffer_object *bo);
extern struct vmw_buffer_object *
vmw_user_bo_noref_lookup(struct ttm_object_file *tfile, u32 handle);

/**
 * vmw_user_bo_noref_release - release a buffer object pointer looked up
 * without reference
 */
static inline void vmw_user_bo_noref_release(void)
{
        ttm_base_object_noref_release();
}


/**
 * Misc Ioctl functionality - vmwgfx_ioctl.c
 */

extern int vmw_getparam_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv);
extern int vmw_get_cap_3d_ioctl(struct drm_device *dev, void *data,
                                struct drm_file *file_priv);
extern int vmw_present_ioctl(struct drm_device *dev, void *data,
                             struct drm_file *file_priv);
extern int vmw_present_readback_ioctl(struct drm_device *dev, void *data,
                                      struct drm_file *file_priv);
extern __poll_t vmw_fops_poll(struct file *filp,
                                  struct poll_table_struct *wait);
extern ssize_t vmw_fops_read(struct file *filp, char __user *buffer,
                             size_t count, loff_t *offset);

/**
 * Fifo utilities - vmwgfx_fifo.c
 */

extern int vmw_fifo_init(struct vmw_private *dev_priv,
                         struct vmw_fifo_state *fifo);
extern void vmw_fifo_release(struct vmw_private *dev_priv,
                             struct vmw_fifo_state *fifo);
extern void *vmw_fifo_reserve(struct vmw_private *dev_priv, uint32_t bytes);
extern void *
vmw_fifo_reserve_dx(struct vmw_private *dev_priv, uint32_t bytes, int ctx_id);
extern void vmw_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes);
extern void vmw_fifo_commit_flush(struct vmw_private *dev_priv, uint32_t bytes);
extern int vmw_fifo_send_fence(struct vmw_private *dev_priv,
                               uint32_t *seqno);
extern void vmw_fifo_ping_host_locked(struct vmw_private *, uint32_t reason);
extern void vmw_fifo_ping_host(struct vmw_private *dev_priv, uint32_t reason);
extern bool vmw_fifo_have_3d(struct vmw_private *dev_priv);
extern bool vmw_fifo_have_pitchlock(struct vmw_private *dev_priv);
extern int vmw_fifo_emit_dummy_query(struct vmw_private *dev_priv,
                                     uint32_t cid);
extern int vmw_fifo_flush(struct vmw_private *dev_priv,
                          bool interruptible);

/**
 * TTM glue - vmwgfx_ttm_glue.c
 */

extern int vmw_ttm_global_init(struct vmw_private *dev_priv);
extern void vmw_ttm_global_release(struct vmw_private *dev_priv);
extern int vmw_mmap(struct file *filp, struct vm_area_struct *vma);

extern void vmw_validation_mem_init_ttm(struct vmw_private *dev_priv,
                                        size_t gran);
/**
 * TTM buffer object driver - vmwgfx_ttm_buffer.c
 */

extern const size_t vmw_tt_size;
extern struct ttm_placement vmw_vram_placement;
extern struct ttm_placement vmw_vram_ne_placement;
extern struct ttm_placement vmw_vram_sys_placement;
extern struct ttm_placement vmw_vram_gmr_placement;
extern struct ttm_placement vmw_vram_gmr_ne_placement;
extern struct ttm_placement vmw_sys_placement;
extern struct ttm_placement vmw_sys_ne_placement;
extern struct ttm_placement vmw_evictable_placement;
extern struct ttm_placement vmw_srf_placement;
extern struct ttm_placement vmw_mob_placement;
extern struct ttm_placement vmw_mob_ne_placement;
extern struct ttm_placement vmw_nonfixed_placement;
extern struct ttm_bo_driver vmw_bo_driver;
extern int vmw_dma_quiescent(struct drm_device *dev);
extern int vmw_bo_map_dma(struct ttm_buffer_object *bo);
extern void vmw_bo_unmap_dma(struct ttm_buffer_object *bo);
extern const struct vmw_sg_table *
vmw_bo_sg_table(struct ttm_buffer_object *bo);
extern void vmw_piter_start(struct vmw_piter *viter,
                            const struct vmw_sg_table *vsgt,
                            unsigned long p_offs);

/**
 * vmw_piter_next - Advance the iterator one page.
 *
 * @viter: Pointer to the iterator to advance.
 *
 * Returns false if past the list of pages, true otherwise.
 */
static inline bool vmw_piter_next(struct vmw_piter *viter)
{
        return viter->next(viter);
}

/**
 * vmw_piter_dma_addr - Return the DMA address of the current page.
 *
 * @viter: Pointer to the iterator
 *
 * Returns the DMA address of the page pointed to by @viter.
 */
static inline dma_addr_t vmw_piter_dma_addr(struct vmw_piter *viter)
{
        return viter->dma_address(viter);
}

/**
 * vmw_piter_page - Return a pointer to the current page.
 *
 * @viter: Pointer to the iterator
 *
 * Returns the DMA address of the page pointed to by @viter.
 */
static inline struct page *vmw_piter_page(struct vmw_piter *viter)
{
        return viter->page(viter);
}

/**
 * Command submission - vmwgfx_execbuf.c
 */

extern int vmw_execbuf_ioctl(struct drm_device *dev, unsigned long data,
                             struct drm_file *file_priv, size_t size);
extern int vmw_execbuf_process(struct drm_file *file_priv,
                               struct vmw_private *dev_priv,
                               void __user *user_commands,
                               void *kernel_commands,
                               uint32_t command_size,
                               uint64_t throttle_us,
                               uint32_t dx_context_handle,
                               struct drm_vmw_fence_rep __user
                               *user_fence_rep,
                               struct vmw_fence_obj **out_fence,
                               uint32_t flags);
extern void __vmw_execbuf_release_pinned_bo(struct vmw_private *dev_priv,
                                            struct vmw_fence_obj *fence);
extern void vmw_execbuf_release_pinned_bo(struct vmw_private *dev_priv);

extern int vmw_execbuf_fence_commands(struct drm_file *file_priv,
                                      struct vmw_private *dev_priv,
                                      struct vmw_fence_obj **p_fence,
                                      uint32_t *p_handle);
extern void vmw_execbuf_copy_fence_user(struct vmw_private *dev_priv,
                                        struct vmw_fpriv *vmw_fp,
                                        int ret,
                                        struct drm_vmw_fence_rep __user
                                        *user_fence_rep,
                                        struct vmw_fence_obj *fence,
                                        uint32_t fence_handle,
                                        int32_t out_fence_fd,
                                        struct sync_file *sync_file);
bool vmw_cmd_describe(const void *buf, u32 *size, char const **cmd);

/**
 * IRQs and wating - vmwgfx_irq.c
 */

extern int vmw_wait_seqno(struct vmw_private *dev_priv, bool lazy,
                          uint32_t seqno, bool interruptible,
                          unsigned long timeout);
extern int vmw_irq_install(struct drm_device *dev, int irq);
extern void vmw_irq_uninstall(struct drm_device *dev);
extern bool vmw_seqno_passed(struct vmw_private *dev_priv,
                                uint32_t seqno);
extern int vmw_fallback_wait(struct vmw_private *dev_priv,
                             bool lazy,
                             bool fifo_idle,
                             uint32_t seqno,
                             bool interruptible,
                             unsigned long timeout);
extern void vmw_update_seqno(struct vmw_private *dev_priv,
                                struct vmw_fifo_state *fifo_state);
extern void vmw_seqno_waiter_add(struct vmw_private *dev_priv);
extern void vmw_seqno_waiter_remove(struct vmw_private *dev_priv);
extern void vmw_goal_waiter_add(struct vmw_private *dev_priv);
extern void vmw_goal_waiter_remove(struct vmw_private *dev_priv);
extern void vmw_generic_waiter_add(struct vmw_private *dev_priv, u32 flag,
                                   int *waiter_count);
extern void vmw_generic_waiter_remove(struct vmw_private *dev_priv,
                                      u32 flag, int *waiter_count);

/**
 * Rudimentary fence-like objects currently used only for throttling -
 * vmwgfx_marker.c
 */

extern void vmw_marker_queue_init(struct vmw_marker_queue *queue);
extern void vmw_marker_queue_takedown(struct vmw_marker_queue *queue);
extern int vmw_marker_push(struct vmw_marker_queue *queue,
                           uint32_t seqno);
extern int vmw_marker_pull(struct vmw_marker_queue *queue,
                           uint32_t signaled_seqno);
extern int vmw_wait_lag(struct vmw_private *dev_priv,
                        struct vmw_marker_queue *queue, uint32_t us);

/**
 * Kernel framebuffer - vmwgfx_fb.c
 */

int vmw_fb_init(struct vmw_private *vmw_priv);
int vmw_fb_close(struct vmw_private *dev_priv);
int vmw_fb_off(struct vmw_private *vmw_priv);
int vmw_fb_on(struct vmw_private *vmw_priv);

/**
 * Kernel modesetting - vmwgfx_kms.c
 */

int vmw_kms_init(struct vmw_private *dev_priv);
int vmw_kms_close(struct vmw_private *dev_priv);
int vmw_kms_save_vga(struct vmw_private *vmw_priv);
int vmw_kms_restore_vga(struct vmw_private *vmw_priv);
int vmw_kms_cursor_bypass_ioctl(struct drm_device *dev, void *data,
                                struct drm_file *file_priv);
void vmw_kms_cursor_post_execbuf(struct vmw_private *dev_priv);
void vmw_kms_cursor_snoop(struct vmw_surface *srf,
                          struct ttm_object_file *tfile,
                          struct ttm_buffer_object *bo,
                          SVGA3dCmdHeader *header);
int vmw_kms_write_svga(struct vmw_private *vmw_priv,
                       unsigned width, unsigned height, unsigned pitch,
                       unsigned bpp, unsigned depth);
void vmw_kms_idle_workqueues(struct vmw_master *vmaster);
bool vmw_kms_validate_mode_vram(struct vmw_private *dev_priv,
                                uint32_t pitch,
                                uint32_t height);
u32 vmw_get_vblank_counter(struct drm_device *dev, unsigned int pipe);
int vmw_enable_vblank(struct drm_device *dev, unsigned int pipe);
void vmw_disable_vblank(struct drm_device *dev, unsigned int pipe);
int vmw_kms_present(struct vmw_private *dev_priv,
                    struct drm_file *file_priv,
                    struct vmw_framebuffer *vfb,
                    struct vmw_surface *surface,
                    uint32_t sid, int32_t destX, int32_t destY,
                    struct drm_vmw_rect *clips,
                    uint32_t num_clips);
int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
                                struct drm_file *file_priv);
void vmw_kms_legacy_hotspot_clear(struct vmw_private *dev_priv);
int vmw_kms_suspend(struct drm_device *dev);
int vmw_kms_resume(struct drm_device *dev);
void vmw_kms_lost_device(struct drm_device *dev);

int vmw_dumb_create(struct drm_file *file_priv,
                    struct drm_device *dev,
                    struct drm_mode_create_dumb *args);

int vmw_dumb_map_offset(struct drm_file *file_priv,
                        struct drm_device *dev, uint32_t handle,
                        uint64_t *offset);
int vmw_dumb_destroy(struct drm_file *file_priv,
                     struct drm_device *dev,
                     uint32_t handle);
extern int vmw_resource_pin(struct vmw_resource *res, bool interruptible);
extern void vmw_resource_unpin(struct vmw_resource *res);
extern enum vmw_res_type vmw_res_type(const struct vmw_resource *res);

/**
 * Overlay control - vmwgfx_overlay.c
 */

int vmw_overlay_init(struct vmw_private *dev_priv);
int vmw_overlay_close(struct vmw_private *dev_priv);
int vmw_overlay_ioctl(struct drm_device *dev, void *data,
                      struct drm_file *file_priv);
int vmw_overlay_stop_all(struct vmw_private *dev_priv);
int vmw_overlay_resume_all(struct vmw_private *dev_priv);
int vmw_overlay_pause_all(struct vmw_private *dev_priv);
int vmw_overlay_claim(struct vmw_private *dev_priv, uint32_t *out);
int vmw_overlay_unref(struct vmw_private *dev_priv, uint32_t stream_id);
int vmw_overlay_num_overlays(struct vmw_private *dev_priv);
int vmw_overlay_num_free_overlays(struct vmw_private *dev_priv);

/**
 * GMR Id manager
 */

extern const struct ttm_mem_type_manager_func vmw_gmrid_manager_func;

/**
 * Prime - vmwgfx_prime.c
 */

extern const struct dma_buf_ops vmw_prime_dmabuf_ops;
extern int vmw_prime_fd_to_handle(struct drm_device *dev,
                                  struct drm_file *file_priv,
                                  int fd, u32 *handle);
extern int vmw_prime_handle_to_fd(struct drm_device *dev,
                                  struct drm_file *file_priv,
                                  uint32_t handle, uint32_t flags,
                                  int *prime_fd);

/*
 * MemoryOBject management -  vmwgfx_mob.c
 */
struct vmw_mob;
extern int vmw_mob_bind(struct vmw_private *dev_priv, struct vmw_mob *mob,
                        const struct vmw_sg_table *vsgt,
                        unsigned long num_data_pages, int32_t mob_id);
extern void vmw_mob_unbind(struct vmw_private *dev_priv,
                           struct vmw_mob *mob);
extern void vmw_mob_destroy(struct vmw_mob *mob);
extern struct vmw_mob *vmw_mob_create(unsigned long data_pages);
extern int vmw_otables_setup(struct vmw_private *dev_priv);
extern void vmw_otables_takedown(struct vmw_private *dev_priv);

/*
 * Context management - vmwgfx_context.c
 */

extern const struct vmw_user_resource_conv *user_context_converter;

extern int vmw_context_check(struct vmw_private *dev_priv,
                             struct ttm_object_file *tfile,
                             int id,
                             struct vmw_resource **p_res);
extern int vmw_context_define_ioctl(struct drm_device *dev, void *data,
                                    struct drm_file *file_priv);
extern int vmw_extended_context_define_ioctl(struct drm_device *dev, void *data,
                                             struct drm_file *file_priv);
extern int vmw_context_destroy_ioctl(struct drm_device *dev, void *data,
                                     struct drm_file *file_priv);
extern struct list_head *vmw_context_binding_list(struct vmw_resource *ctx);
extern struct vmw_cmdbuf_res_manager *
vmw_context_res_man(struct vmw_resource *ctx);
extern struct vmw_resource *vmw_context_cotable(struct vmw_resource *ctx,
                                                SVGACOTableType cotable_type);
extern struct list_head *vmw_context_binding_list(struct vmw_resource *ctx);
struct vmw_ctx_binding_state;
extern struct vmw_ctx_binding_state *
vmw_context_binding_state(struct vmw_resource *ctx);
extern void vmw_dx_context_scrub_cotables(struct vmw_resource *ctx,
                                          bool readback);
extern int vmw_context_bind_dx_query(struct vmw_resource *ctx_res,
                                     struct vmw_buffer_object *mob);
extern struct vmw_buffer_object *
vmw_context_get_dx_query_mob(struct vmw_resource *ctx_res);


/*
 * Surface management - vmwgfx_surface.c
 */

extern const struct vmw_user_resource_conv *user_surface_converter;

extern void vmw_surface_res_free(struct vmw_resource *res);
extern int vmw_surface_destroy_ioctl(struct drm_device *dev, void *data,
                                     struct drm_file *file_priv);
extern int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
                                    struct drm_file *file_priv);
extern int vmw_surface_reference_ioctl(struct drm_device *dev, void *data,
                                       struct drm_file *file_priv);
extern int vmw_gb_surface_define_ioctl(struct drm_device *dev, void *data,
                                       struct drm_file *file_priv);
extern int vmw_gb_surface_reference_ioctl(struct drm_device *dev, void *data,
                                          struct drm_file *file_priv);
extern int vmw_surface_check(struct vmw_private *dev_priv,
                             struct ttm_object_file *tfile,
                             uint32_t handle, int *id);
extern int vmw_surface_validate(struct vmw_private *dev_priv,
                                struct vmw_surface *srf);
int vmw_surface_gb_priv_define(struct drm_device *dev,
                               uint32_t user_accounting_size,
                               SVGA3dSurfaceAllFlags svga3d_flags,
                               SVGA3dSurfaceFormat format,
                               bool for_scanout,
                               uint32_t num_mip_levels,
                               uint32_t multisample_count,
                               uint32_t array_size,
                               struct drm_vmw_size size,
                               SVGA3dMSPattern multisample_pattern,
                               SVGA3dMSQualityLevel quality_level,
                               struct vmw_surface **srf_out);
extern int vmw_gb_surface_define_ext_ioctl(struct drm_device *dev,
                                           void *data,
                                           struct drm_file *file_priv);
extern int vmw_gb_surface_reference_ext_ioctl(struct drm_device *dev,
                                              void *data,
                                              struct drm_file *file_priv);

/*
 * Shader management - vmwgfx_shader.c
 */

extern const struct vmw_user_resource_conv *user_shader_converter;

extern int vmw_shader_define_ioctl(struct drm_device *dev, void *data,
                                   struct drm_file *file_priv);
extern int vmw_shader_destroy_ioctl(struct drm_device *dev, void *data,
                                    struct drm_file *file_priv);
extern int vmw_compat_shader_add(struct vmw_private *dev_priv,
                                 struct vmw_cmdbuf_res_manager *man,
                                 u32 user_key, const void *bytecode,
                                 SVGA3dShaderType shader_type,
                                 size_t size,
                                 struct list_head *list);
extern int vmw_shader_remove(struct vmw_cmdbuf_res_manager *man,
                             u32 user_key, SVGA3dShaderType shader_type,
                             struct list_head *list);
extern int vmw_dx_shader_add(struct vmw_cmdbuf_res_manager *man,
                             struct vmw_resource *ctx,
                             u32 user_key,
                             SVGA3dShaderType shader_type,
                             struct list_head *list);
extern void vmw_dx_shader_cotable_list_scrub(struct vmw_private *dev_priv,
                                             struct list_head *list,
                                             bool readback);

extern struct vmw_resource *
vmw_shader_lookup(struct vmw_cmdbuf_res_manager *man,
                  u32 user_key, SVGA3dShaderType shader_type);

/*
 * Command buffer managed resources - vmwgfx_cmdbuf_res.c
 */

extern struct vmw_cmdbuf_res_manager *
vmw_cmdbuf_res_man_create(struct vmw_private *dev_priv);
extern void vmw_cmdbuf_res_man_destroy(struct vmw_cmdbuf_res_manager *man);
extern size_t vmw_cmdbuf_res_man_size(void);
extern struct vmw_resource *
vmw_cmdbuf_res_lookup(struct vmw_cmdbuf_res_manager *man,
                      enum vmw_cmdbuf_res_type res_type,
                      u32 user_key);
extern void vmw_cmdbuf_res_revert(struct list_head *list);
extern void vmw_cmdbuf_res_commit(struct list_head *list);
extern int vmw_cmdbuf_res_add(struct vmw_cmdbuf_res_manager *man,
                              enum vmw_cmdbuf_res_type res_type,
                              u32 user_key,
                              struct vmw_resource *res,
                              struct list_head *list);
extern int vmw_cmdbuf_res_remove(struct vmw_cmdbuf_res_manager *man,
                                 enum vmw_cmdbuf_res_type res_type,
                                 u32 user_key,
                                 struct list_head *list,
                                 struct vmw_resource **res);

/*
 * COTable management - vmwgfx_cotable.c
 */
extern const SVGACOTableType vmw_cotable_scrub_order[];
extern struct vmw_resource *vmw_cotable_alloc(struct vmw_private *dev_priv,
                                              struct vmw_resource *ctx,
                                              u32 type);
extern int vmw_cotable_notify(struct vmw_resource *res, int id);
extern int vmw_cotable_scrub(struct vmw_resource *res, bool readback);
extern void vmw_cotable_add_resource(struct vmw_resource *ctx,
                                     struct list_head *head);

/*
 * Command buffer managerment vmwgfx_cmdbuf.c
 */
struct vmw_cmdbuf_man;
struct vmw_cmdbuf_header;

extern struct vmw_cmdbuf_man *
vmw_cmdbuf_man_create(struct vmw_private *dev_priv);
extern int vmw_cmdbuf_set_pool_size(struct vmw_cmdbuf_man *man,
                                    size_t size, size_t default_size);
extern void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man);
extern void vmw_cmdbuf_man_destroy(struct vmw_cmdbuf_man *man);
extern int vmw_cmdbuf_idle(struct vmw_cmdbuf_man *man, bool interruptible,
                           unsigned long timeout);
extern void *vmw_cmdbuf_reserve(struct vmw_cmdbuf_man *man, size_t size,
                                int ctx_id, bool interruptible,
                                struct vmw_cmdbuf_header *header);
extern void vmw_cmdbuf_commit(struct vmw_cmdbuf_man *man, size_t size,
                              struct vmw_cmdbuf_header *header,
                              bool flush);
extern void *vmw_cmdbuf_alloc(struct vmw_cmdbuf_man *man,
                              size_t size, bool interruptible,
                              struct vmw_cmdbuf_header **p_header);
extern void vmw_cmdbuf_header_free(struct vmw_cmdbuf_header *header);
extern int vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man,
                                bool interruptible);
extern void vmw_cmdbuf_irqthread(struct vmw_cmdbuf_man *man);

/* CPU blit utilities - vmwgfx_blit.c */

/**
 * struct vmw_diff_cpy - CPU blit information structure
 *
 * @rect: The output bounding box rectangle.
 * @line: The current line of the blit.
 * @line_offset: Offset of the current line segment.
 * @cpp: Bytes per pixel (granularity information).
 * @memcpy: Which memcpy function to use.
 */
struct vmw_diff_cpy {
        struct drm_rect rect;
        size_t line;
        size_t line_offset;
        int cpp;
        void (*do_cpy)(struct vmw_diff_cpy *diff, u8 *dest, const u8 *src,
                       size_t n);
};

#define VMW_CPU_BLIT_INITIALIZER {      \
        .do_cpy = vmw_memcpy,           \
}

#define VMW_CPU_BLIT_DIFF_INITIALIZER(_cpp) {     \
        .line = 0,                                \
        .line_offset = 0,                         \
        .rect = { .x1 = INT_MAX/2,                \
                  .y1 = INT_MAX/2,                \
                  .x2 = INT_MIN/2,                \
                  .y2 = INT_MIN/2                 \
        },                                        \
        .cpp = _cpp,                              \
        .do_cpy = vmw_diff_memcpy,                \
}

void vmw_diff_memcpy(struct vmw_diff_cpy *diff, u8 *dest, const u8 *src,
                     size_t n);

void vmw_memcpy(struct vmw_diff_cpy *diff, u8 *dest, const u8 *src, size_t n);

int vmw_bo_cpu_blit(struct ttm_buffer_object *dst,
                    u32 dst_offset, u32 dst_stride,
                    struct ttm_buffer_object *src,
                    u32 src_offset, u32 src_stride,
                    u32 w, u32 h,
                    struct vmw_diff_cpy *diff);

/* Host messaging -vmwgfx_msg.c: */
int vmw_host_get_guestinfo(const char *guest_info_param,
                           char *buffer, size_t *length);
int vmw_host_log(const char *log);

/**
 * Inline helper functions
 */

static inline void vmw_surface_unreference(struct vmw_surface **srf)
{
        struct vmw_surface *tmp_srf = *srf;
        struct vmw_resource *res = &tmp_srf->res;
        *srf = NULL;

        vmw_resource_unreference(&res);
}

static inline struct vmw_surface *vmw_surface_reference(struct vmw_surface *srf)
{
        (void) vmw_resource_reference(&srf->res);
        return srf;
}

static inline void vmw_bo_unreference(struct vmw_buffer_object **buf)
{
        struct vmw_buffer_object *tmp_buf = *buf;

        *buf = NULL;
        if (tmp_buf != NULL) {
                struct ttm_buffer_object *bo = &tmp_buf->base;

                ttm_bo_unref(&bo);
        }
}

static inline struct vmw_buffer_object *
vmw_bo_reference(struct vmw_buffer_object *buf)
{
        if (ttm_bo_reference(&buf->base))
                return buf;
        return NULL;
}

static inline struct ttm_mem_global *vmw_mem_glob(struct vmw_private *dev_priv)
{
        return (struct ttm_mem_global *) dev_priv->mem_global_ref.object;
}

static inline void vmw_fifo_resource_inc(struct vmw_private *dev_priv)
{
        atomic_inc(&dev_priv->num_fifo_resources);
}

static inline void vmw_fifo_resource_dec(struct vmw_private *dev_priv)
{
        atomic_dec(&dev_priv->num_fifo_resources);
}

/**
 * vmw_mmio_read - Perform a MMIO read from volatile memory
 *
 * @addr: The address to read from
 *
 * This function is intended to be equivalent to ioread32() on
 * memremap'd memory, but without byteswapping.
 */
static inline u32 vmw_mmio_read(u32 *addr)
{
        return READ_ONCE(*addr);
}

/**
 * vmw_mmio_write - Perform a MMIO write to volatile memory
 *
 * @addr: The address to write to
 *
 * This function is intended to be equivalent to iowrite32 on
 * memremap'd memory, but without byteswapping.
 */
static inline void vmw_mmio_write(u32 value, u32 *addr)
{
        WRITE_ONCE(*addr, value);
}
#endif