vmwgfx_drv.h

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/**************************************************************************
 *
 * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
 * 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
 * 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
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#ifndef _VMWGFX_DRV_H_
#define _VMWGFX_DRV_H_

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

#define VMWGFX_DRIVER_DATE "20120209"
#define VMWGFX_DRIVER_MAJOR 2
#define VMWGFX_DRIVER_MINOR 4
#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 VMW_PL_GMR TTM_PL_PRIV0
#define VMW_PL_FLAG_GMR TTM_PL_FLAG_PRIV0

#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

struct vmw_fpriv {
    struct drm_master *locked_master;
    struct ttm_object_file *tfile;
    struct list_head fence_events;
};

struct vmw_dma_buffer {
    struct ttm_buffer_object base;
    struct list_head validate_list;
    bool gmr_bound;
    uint32_t cur_validate_node;
    bool on_validate_list;
};

struct vmw_resource {
    struct kref kref;
    struct vmw_private *dev_priv;
    struct idr *idr;
    int id;
    enum ttm_object_type res_type;
    bool avail;
    void (*remove_from_lists) (struct vmw_resource *res);
    void (*hw_destroy) (struct vmw_resource *res);
    void (*res_free) (struct vmw_resource *res);
    struct list_head validate_head;
    struct list_head query_head; /* Protected by the cmdbuf mutex */
    /* TODO is a generic snooper needed? */
#if 0
    void (*snoop)(struct vmw_resource *res,
              struct ttm_object_file *tfile,
              SVGA3dCmdHeader *header);
    void *snoop_priv;
#endif
};

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

struct vmw_framebuffer;
struct vmw_surface_offset;

struct vmw_surface {
    struct vmw_resource res;
    struct list_head lru_head; /* Protected by the resource lock */
    uint32_t flags;
    uint32_t format;
    uint32_t mip_levels[DRM_VMW_MAX_SURFACE_FACES];
    struct drm_vmw_size *sizes;
    uint32_t num_sizes;

    bool scanout;

    /* TODO so far just a extra pointer */
    struct vmw_cursor_snooper snooper;
    struct ttm_buffer_object *backup;
    struct vmw_surface_offset *offsets;
    uint32_t backup_size;
};

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

struct vmw_fifo_state {
    unsigned long reserved_size;
    __le32 *dynamic_buffer;
    __le32 *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;
};

struct vmw_relocation {
    SVGAGuestPtr *location;
    uint32_t index;
};

struct vmw_sw_context{
    struct ida bo_list;
    uint32_t last_cid;
    bool cid_valid;
    bool kernel; 
    struct vmw_resource *cur_ctx;
    uint32_t last_sid;
    uint32_t sid_translation;
    bool sid_valid;
    struct ttm_object_file *tfile;
    struct list_head validate_nodes;
    struct vmw_relocation relocs[VMWGFX_MAX_RELOCATIONS];
    uint32_t cur_reloc;
    struct ttm_validate_buffer val_bufs[VMWGFX_MAX_VALIDATIONS];
    uint32_t cur_val_buf;
    uint32_t *cmd_bounce;
    uint32_t cmd_bounce_size;
    struct list_head resource_list;
    uint32_t fence_flags;
    struct list_head query_list;
    struct ttm_buffer_object *cur_query_bo;
    uint32_t cur_query_cid;
    bool query_cid_valid;
};

struct vmw_legacy_display;
struct vmw_overlay;

struct vmw_master {
    struct ttm_lock lock;
    struct mutex fb_surf_mutex;
    struct list_head fb_surf;
};

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

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 mmio_start;
    uint32_t mmio_size;
    uint32_t fb_max_width;
    uint32_t fb_max_height;
    uint32_t initial_width;
    uint32_t initial_height;
    __le32 __iomem *mmio_virt;
    int mmio_mtrr;
    uint32_t capabilities;
    uint32_t max_gmr_descriptors;
    uint32_t max_gmr_ids;
    uint32_t max_gmr_pages;
    uint32_t memory_size;
    bool has_gmr;
    struct mutex hw_mutex;

    /*
     * 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;

    /*
     * Framebuffer info.
     */

    void *fb_info;
    struct vmw_legacy_display *ldu_priv;
    struct vmw_screen_object_display *sou_priv;
    struct vmw_overlay *overlay_priv;

    /*
     * Context and surface management.
     */

    rwlock_t resource_lock;
    struct idr context_idr;
    struct idr surface_idr;
    struct idr stream_idr;

    /*
     * 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;
    int fence_queue_waiters; /* Protected by hw_mutex */
    int goal_queue_waiters; /* Protected by hw_mutex */
    atomic_t fifo_queue_waiters;
    uint32_t last_read_seqno;
    spinlock_t irq_lock;
    struct vmw_fence_manager *fman;
    uint32_t irq_mask;

    /*
     * Device state
     */

    uint32_t traces_state;
    uint32_t enable_state;
    uint32_t config_done_state;

    struct vmw_sw_context ctx;
    struct mutex cmdbuf_mutex;

    bool stealth;
    bool is_opened;
    bool enable_fb;

    struct vmw_master *active_master;
    struct vmw_master fbdev_master;
    struct notifier_block pm_nb;
    bool suspended;

    struct mutex release_mutex;
    uint32_t num_3d_resources;

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

    struct ttm_buffer_object *dummy_query_bo;
    struct ttm_buffer_object *pinned_bo;
    uint32_t query_cid;
    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 surface_lru;
    uint32_t used_memory_size;
};

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;
}

static inline void vmw_write(struct vmw_private *dev_priv,
                 unsigned int offset, uint32_t value)
{
    outl(offset, dev_priv->io_start + VMWGFX_INDEX_PORT);
    outl(value, dev_priv->io_start + VMWGFX_VALUE_PORT);
}

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

    outl(offset, dev_priv->io_start + VMWGFX_INDEX_PORT);
    val = inl(dev_priv->io_start + VMWGFX_VALUE_PORT);
    return val;
}

int vmw_3d_resource_inc(struct vmw_private *dev_priv, bool unhide_svga);
void vmw_3d_resource_dec(struct vmw_private *dev_priv, bool hide_svga);

extern int vmw_gmr_bind(struct vmw_private *dev_priv,
            struct page *pages[],
            unsigned long num_pages,
            int gmr_id);
extern void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id);

extern struct vmw_resource *vmw_context_alloc(struct vmw_private *dev_priv);
extern void vmw_resource_unreference(struct vmw_resource **p_res);
extern struct vmw_resource *vmw_resource_reference(struct vmw_resource *res);
extern int vmw_context_destroy_ioctl(struct drm_device *dev, void *data,
                     struct drm_file *file_priv);
extern int vmw_context_define_ioctl(struct drm_device *dev, void *data,
                    struct drm_file *file_priv);
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_user_lookup_handle(struct vmw_private *dev_priv,
                  struct ttm_object_file *tfile,
                  uint32_t handle,
                  struct vmw_surface **out_surf,
                  struct vmw_dma_buffer **out_buf);
extern void vmw_surface_res_free(struct vmw_resource *res);
extern int vmw_surface_init(struct vmw_private *dev_priv,
                struct vmw_surface *srf,
                void (*res_free) (struct vmw_resource *res));
extern int vmw_user_surface_lookup_handle(struct vmw_private *dev_priv,
                      struct ttm_object_file *tfile,
                      uint32_t handle,
                      struct vmw_surface **out);
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_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);
extern void vmw_dmabuf_bo_free(struct ttm_buffer_object *bo);
extern int vmw_dmabuf_init(struct vmw_private *dev_priv,
               struct vmw_dma_buffer *vmw_bo,
               size_t size, struct ttm_placement *placement,
               bool interuptable,
               void (*bo_free) (struct ttm_buffer_object *bo));
extern int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data,
                  struct drm_file *file_priv);
extern int vmw_dmabuf_unref_ioctl(struct drm_device *dev, void *data,
                  struct drm_file *file_priv);
extern uint32_t vmw_dmabuf_validate_node(struct ttm_buffer_object *bo,
                     uint32_t cur_validate_node);
extern void vmw_dmabuf_validate_clear(struct ttm_buffer_object *bo);
extern int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
                  uint32_t id, struct vmw_dma_buffer **out);
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 list_head *list);

extern int vmw_dmabuf_to_placement(struct vmw_private *vmw_priv,
                   struct vmw_dma_buffer *bo,
                   struct ttm_placement *placement,
                   bool interruptible);
extern int vmw_dmabuf_to_vram(struct vmw_private *dev_priv,
                  struct vmw_dma_buffer *buf,
                  bool pin, bool interruptible);
extern int vmw_dmabuf_to_vram_or_gmr(struct vmw_private *dev_priv,
                     struct vmw_dma_buffer *buf,
                     bool pin, bool interruptible);
extern int vmw_dmabuf_to_start_of_vram(struct vmw_private *vmw_priv,
                       struct vmw_dma_buffer *bo,
                       bool pin, bool interruptible);
extern int vmw_dmabuf_unpin(struct vmw_private *vmw_priv,
                struct vmw_dma_buffer *bo,
                bool interruptible);
extern void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *buf,
                 SVGAGuestPtr *ptr);
extern void vmw_bo_pin(struct ttm_buffer_object *bo, bool pin);

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 unsigned int 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);

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_commit(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(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_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 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_evictable_placement;
extern struct ttm_placement vmw_srf_placement;
extern struct ttm_bo_driver vmw_bo_driver;
extern int vmw_dma_quiescent(struct drm_device *dev);

extern int vmw_execbuf_ioctl(struct drm_device *dev, void *data,
                 struct drm_file *file_priv);
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,
                   struct drm_vmw_fence_rep __user
                   *user_fence_rep,
                   struct vmw_fence_obj **out_fence);

extern void
vmw_execbuf_release_pinned_bo(struct vmw_private *dev_priv,
                  bool only_on_cid_match, uint32_t cid);

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);

extern irqreturn_t vmw_irq_handler(DRM_IRQ_ARGS);
extern int vmw_wait_seqno(struct vmw_private *dev_priv, bool lazy,
                 uint32_t seqno, bool interruptible,
                 unsigned long timeout);
extern void vmw_irq_preinstall(struct drm_device *dev);
extern int vmw_irq_postinstall(struct drm_device *dev);
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_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);

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);

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, int crtc);
int vmw_enable_vblank(struct drm_device *dev, int crtc);
void vmw_disable_vblank(struct drm_device *dev, int crtc);
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_readback(struct vmw_private *dev_priv,
             struct drm_file *file_priv,
             struct vmw_framebuffer *vfb,
             struct drm_vmw_fence_rep __user *user_fence_rep,
             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);

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);
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);

extern const struct ttm_mem_type_manager_func vmw_gmrid_manager_func;

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

    ttm_bo_unref(&bo);
}

static inline struct vmw_dma_buffer *vmw_dmabuf_reference(struct vmw_dma_buffer *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;
}
#endif