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drm/vmwgfx: rework to new fence interface, v2 

Use the new fence interface on vmwgfx too.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>

---
Changes since v1:
Fix a sleeping function called from invalid context in enable_signaling.
This commit is contained in:
Maarten Lankhorst 2014-03-26 14:07:44 +01:00
Родитель c060a4e135
Коммит 2298e804e9
6 изменённых файлов: 228 добавлений и 146 удалений
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1
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
Просмотреть файл

@ -703,6 +703,7 @@ 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_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);

2
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
Просмотреть файл

@ -2389,7 +2389,7 @@ vmw_execbuf_copy_fence_user(struct vmw_private *dev_priv,
BUG_ON(fence == NULL);
fence_rep.handle = fence_handle;
fence_rep.seqno = fence->seqno;
fence_rep.seqno = fence->base.seqno;
vmw_update_seqno(dev_priv, &dev_priv->fifo);
fence_rep.passed_seqno = dev_priv->last_read_seqno;
}

324
drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
Просмотреть файл

@ -35,7 +35,7 @@ struct vmw_fence_manager {
struct vmw_private *dev_priv;
spinlock_t lock;
struct list_head fence_list;
struct work_struct work;
struct work_struct work, ping_work;
u32 user_fence_size;
u32 fence_size;
u32 event_fence_action_size;
@ -46,6 +46,7 @@ struct vmw_fence_manager {
bool goal_irq_on; /* Protected by @goal_irq_mutex */
bool seqno_valid; /* Protected by @lock, and may not be set to true
without the @goal_irq_mutex held. */
unsigned ctx;
};
struct vmw_user_fence {
@ -80,6 +81,12 @@ struct vmw_event_fence_action {
uint32_t *tv_usec;
};
static struct vmw_fence_manager *
fman_from_fence(struct vmw_fence_obj *fence)
{
return container_of(fence->base.lock, struct vmw_fence_manager, lock);
}
/**
* Note on fencing subsystem usage of irqs:
* Typically the vmw_fences_update function is called
@ -102,25 +109,143 @@ struct vmw_event_fence_action {
* objects with actions attached to them.
*/
static void vmw_fence_obj_destroy_locked(struct kref *kref)
static void vmw_fence_obj_destroy(struct fence *f)
{
struct vmw_fence_obj *fence =
container_of(kref, struct vmw_fence_obj, kref);
container_of(f, struct vmw_fence_obj, base);
struct vmw_fence_manager *fman = fence->fman;
unsigned int num_fences;
struct vmw_fence_manager *fman = fman_from_fence(fence);
unsigned long irq_flags;
spin_lock_irqsave(&fman->lock, irq_flags);
list_del_init(&fence->head);
num_fences = --fman->num_fence_objects;
spin_unlock_irq(&fman->lock);
if (fence->destroy)
fence->destroy(fence);
else
kfree(fence);
spin_lock_irq(&fman->lock);
--fman->num_fence_objects;
spin_unlock_irqrestore(&fman->lock, irq_flags);
fence->destroy(fence);
}
static const char *vmw_fence_get_driver_name(struct fence *f)
{
return "vmwgfx";
}
static const char *vmw_fence_get_timeline_name(struct fence *f)
{
return "svga";
}
static void vmw_fence_ping_func(struct work_struct *work)
{
struct vmw_fence_manager *fman =
container_of(work, struct vmw_fence_manager, ping_work);
vmw_fifo_ping_host(fman->dev_priv, SVGA_SYNC_GENERIC);
}
static bool vmw_fence_enable_signaling(struct fence *f)
{
struct vmw_fence_obj *fence =
container_of(f, struct vmw_fence_obj, base);
struct vmw_fence_manager *fman = fman_from_fence(fence);
struct vmw_private *dev_priv = fman->dev_priv;
__le32 __iomem *fifo_mem = dev_priv->mmio_virt;
u32 seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
if (seqno - fence->base.seqno < VMW_FENCE_WRAP)
return false;
if (mutex_trylock(&dev_priv->hw_mutex)) {
vmw_fifo_ping_host_locked(dev_priv, SVGA_SYNC_GENERIC);
mutex_unlock(&dev_priv->hw_mutex);
} else
schedule_work(&fman->ping_work);
return true;
}
struct vmwgfx_wait_cb {
struct fence_cb base;
struct task_struct *task;
};
static void
vmwgfx_wait_cb(struct fence *fence, struct fence_cb *cb)
{
struct vmwgfx_wait_cb *wait =
container_of(cb, struct vmwgfx_wait_cb, base);
wake_up_process(wait->task);
}
static void __vmw_fences_update(struct vmw_fence_manager *fman);
static long vmw_fence_wait(struct fence *f, bool intr, signed long timeout)
{
struct vmw_fence_obj *fence =
container_of(f, struct vmw_fence_obj, base);
struct vmw_fence_manager *fman = fman_from_fence(fence);
struct vmw_private *dev_priv = fman->dev_priv;
struct vmwgfx_wait_cb cb;
long ret = timeout;
unsigned long irq_flags;
if (likely(vmw_fence_obj_signaled(fence)))
return timeout;
vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
vmw_seqno_waiter_add(dev_priv);
spin_lock_irqsave(f->lock, irq_flags);
if (intr && signal_pending(current)) {
ret = -ERESTARTSYS;
goto out;
}
cb.base.func = vmwgfx_wait_cb;
cb.task = current;
list_add(&cb.base.node, &f->cb_list);
while (ret > 0) {
__vmw_fences_update(fman);
if (test_bit(FENCE_FLAG_SIGNALED_BIT, &f->flags))
break;
if (intr)
__set_current_state(TASK_INTERRUPTIBLE);
else
__set_current_state(TASK_UNINTERRUPTIBLE);
spin_unlock_irqrestore(f->lock, irq_flags);
ret = schedule_timeout(ret);
spin_lock_irqsave(f->lock, irq_flags);
if (ret > 0 && intr && signal_pending(current))
ret = -ERESTARTSYS;
}
if (!list_empty(&cb.base.node))
list_del(&cb.base.node);
__set_current_state(TASK_RUNNING);
out:
spin_unlock_irqrestore(f->lock, irq_flags);
vmw_seqno_waiter_remove(dev_priv);
return ret;
}
static struct fence_ops vmw_fence_ops = {
.get_driver_name = vmw_fence_get_driver_name,
.get_timeline_name = vmw_fence_get_timeline_name,
.enable_signaling = vmw_fence_enable_signaling,
.wait = vmw_fence_wait,
.release = vmw_fence_obj_destroy,
};
/**
* Execute signal actions on fences recently signaled.
@ -180,12 +305,14 @@ struct vmw_fence_manager *vmw_fence_manager_init(struct vmw_private *dev_priv)
INIT_LIST_HEAD(&fman->fence_list);
INIT_LIST_HEAD(&fman->cleanup_list);
INIT_WORK(&fman->work, &vmw_fence_work_func);
INIT_WORK(&fman->ping_work, &vmw_fence_ping_func);
fman->fifo_down = true;
fman->user_fence_size = ttm_round_pot(sizeof(struct vmw_user_fence));
fman->fence_size = ttm_round_pot(sizeof(struct vmw_fence_obj));
fman->event_fence_action_size =
ttm_round_pot(sizeof(struct vmw_event_fence_action));
mutex_init(&fman->goal_irq_mutex);
fman->ctx = fence_context_alloc(1);
return fman;
}
@ -196,6 +323,7 @@ void vmw_fence_manager_takedown(struct vmw_fence_manager *fman)
bool lists_empty;
(void) cancel_work_sync(&fman->work);
(void) cancel_work_sync(&fman->ping_work);
spin_lock_irqsave(&fman->lock, irq_flags);
lists_empty = list_empty(&fman->fence_list) &&
@ -211,16 +339,12 @@ static int vmw_fence_obj_init(struct vmw_fence_manager *fman,
void (*destroy) (struct vmw_fence_obj *fence))
{
unsigned long irq_flags;
unsigned int num_fences;
int ret = 0;
fence->seqno = seqno;
fence_init(&fence->base, &vmw_fence_ops, &fman->lock,
fman->ctx, seqno);
INIT_LIST_HEAD(&fence->seq_passed_actions);
fence->fman = fman;
fence->signaled = 0;
kref_init(&fence->kref);
fence->destroy = destroy;
init_waitqueue_head(&fence->queue);
spin_lock_irqsave(&fman->lock, irq_flags);
if (unlikely(fman->fifo_down)) {
@ -228,7 +352,7 @@ static int vmw_fence_obj_init(struct vmw_fence_manager *fman,
goto out_unlock;
}
list_add_tail(&fence->head, &fman->fence_list);
num_fences = ++fman->num_fence_objects;
++fman->num_fence_objects;
out_unlock:
spin_unlock_irqrestore(&fman->lock, irq_flags);
@ -236,38 +360,6 @@ out_unlock:
}
struct vmw_fence_obj *vmw_fence_obj_reference(struct vmw_fence_obj *fence)
{
if (unlikely(fence == NULL))
return NULL;
kref_get(&fence->kref);
return fence;
}
/**
* vmw_fence_obj_unreference
*
* Note that this function may not be entered with disabled irqs since
* it may re-enable them in the destroy function.
*
*/
void vmw_fence_obj_unreference(struct vmw_fence_obj **fence_p)
{
struct vmw_fence_obj *fence = *fence_p;
struct vmw_fence_manager *fman;
if (unlikely(fence == NULL))
return;
fman = fence->fman;
*fence_p = NULL;
spin_lock_irq(&fman->lock);
BUG_ON(atomic_read(&fence->kref.refcount) == 0);
kref_put(&fence->kref, vmw_fence_obj_destroy_locked);
spin_unlock_irq(&fman->lock);
}
static void vmw_fences_perform_actions(struct vmw_fence_manager *fman,
struct list_head *list)
{
@ -323,7 +415,7 @@ static bool vmw_fence_goal_new_locked(struct vmw_fence_manager *fman,
list_for_each_entry(fence, &fman->fence_list, head) {
if (!list_empty(&fence->seq_passed_actions)) {
fman->seqno_valid = true;
iowrite32(fence->seqno,
iowrite32(fence->base.seqno,
fifo_mem + SVGA_FIFO_FENCE_GOAL);
break;
}
@ -350,27 +442,27 @@ static bool vmw_fence_goal_new_locked(struct vmw_fence_manager *fman,
*/
static bool vmw_fence_goal_check_locked(struct vmw_fence_obj *fence)
{
struct vmw_fence_manager *fman = fman_from_fence(fence);
u32 goal_seqno;
__le32 __iomem *fifo_mem;
if (fence->signaled)
if (fence_is_signaled_locked(&fence->base))
return false;
fifo_mem = fence->fman->dev_priv->mmio_virt;
fifo_mem = fman->dev_priv->mmio_virt;
goal_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE_GOAL);
if (likely(fence->fman->seqno_valid &&
goal_seqno - fence->seqno < VMW_FENCE_WRAP))
if (likely(fman->seqno_valid &&
goal_seqno - fence->base.seqno < VMW_FENCE_WRAP))
return false;
iowrite32(fence->seqno, fifo_mem + SVGA_FIFO_FENCE_GOAL);
fence->fman->seqno_valid = true;
iowrite32(fence->base.seqno, fifo_mem + SVGA_FIFO_FENCE_GOAL);
fman->seqno_valid = true;
return true;
}
void vmw_fences_update(struct vmw_fence_manager *fman)
static void __vmw_fences_update(struct vmw_fence_manager *fman)
{
unsigned long flags;
struct vmw_fence_obj *fence, *next_fence;
struct list_head action_list;
bool needs_rerun;
@ -379,32 +471,25 @@ void vmw_fences_update(struct vmw_fence_manager *fman)
seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
rerun:
spin_lock_irqsave(&fman->lock, flags);
list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) {
if (seqno - fence->seqno < VMW_FENCE_WRAP) {
if (seqno - fence->base.seqno < VMW_FENCE_WRAP) {
list_del_init(&fence->head);
fence->signaled = 1;
fence_signal_locked(&fence->base);
INIT_LIST_HEAD(&action_list);
list_splice_init(&fence->seq_passed_actions,
&action_list);
vmw_fences_perform_actions(fman, &action_list);
wake_up_all(&fence->queue);
} else
break;
}
needs_rerun = vmw_fence_goal_new_locked(fman, seqno);
if (!list_empty(&fman->cleanup_list))
(void) schedule_work(&fman->work);
spin_unlock_irqrestore(&fman->lock, flags);
/*
* Rerun if the fence goal seqno was updated, and the
* hardware might have raced with that update, so that
* we missed a fence_goal irq.
*/
needs_rerun = vmw_fence_goal_new_locked(fman, seqno);
if (unlikely(needs_rerun)) {
new_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
if (new_seqno != seqno) {
@ -412,75 +497,58 @@ rerun:
goto rerun;
}
}
if (!list_empty(&fman->cleanup_list))
(void) schedule_work(&fman->work);
}
void vmw_fences_update(struct vmw_fence_manager *fman)
{
unsigned long irq_flags;
spin_lock_irqsave(&fman->lock, irq_flags);
__vmw_fences_update(fman);
spin_unlock_irqrestore(&fman->lock, irq_flags);
}
bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence)
{
struct vmw_fence_manager *fman = fence->fman;
unsigned long irq_flags;
uint32_t signaled;
struct vmw_fence_manager *fman = fman_from_fence(fence);
spin_lock_irqsave(&fman->lock, irq_flags);
signaled = fence->signaled;
spin_unlock_irqrestore(&fman->lock, irq_flags);
if (signaled)
if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
return 1;
vmw_fences_update(fman);
spin_lock_irqsave(&fman->lock, irq_flags);
signaled = fence->signaled;
spin_unlock_irqrestore(&fman->lock, irq_flags);
return signaled;
return fence_is_signaled(&fence->base);
}
int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy,
bool interruptible, unsigned long timeout)
{
struct vmw_private *dev_priv = fence->fman->dev_priv;
long ret;
long ret = fence_wait_timeout(&fence->base, interruptible, timeout);
if (likely(vmw_fence_obj_signaled(fence)))
if (likely(ret > 0))
return 0;
vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
vmw_seqno_waiter_add(dev_priv);
if (interruptible)
ret = wait_event_interruptible_timeout
(fence->queue,
vmw_fence_obj_signaled(fence),
timeout);
else if (ret == 0)
return -EBUSY;
else
ret = wait_event_timeout
(fence->queue,
vmw_fence_obj_signaled(fence),
timeout);
vmw_seqno_waiter_remove(dev_priv);
if (unlikely(ret == 0))
ret = -EBUSY;
else if (likely(ret > 0))
ret = 0;
return ret;
return ret;
}
void vmw_fence_obj_flush(struct vmw_fence_obj *fence)
{
struct vmw_private *dev_priv = fence->fman->dev_priv;
struct vmw_private *dev_priv = fman_from_fence(fence)->dev_priv;
vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
}
static void vmw_fence_destroy(struct vmw_fence_obj *fence)
{
struct vmw_fence_manager *fman = fence->fman;
struct vmw_fence_manager *fman = fman_from_fence(fence);
fence_free(&fence->base);
kfree(fence);
/*
* Free kernel space accounting.
*/
@ -527,7 +595,7 @@ static void vmw_user_fence_destroy(struct vmw_fence_obj *fence)
{
struct vmw_user_fence *ufence =
container_of(fence, struct vmw_user_fence, fence);
struct vmw_fence_manager *fman = fence->fman;
struct vmw_fence_manager *fman = fman_from_fence(fence);
ttm_base_object_kfree(ufence, base);
/*
@ -620,7 +688,6 @@ out_no_object:
void vmw_fence_fifo_down(struct vmw_fence_manager *fman)
{
unsigned long irq_flags;
struct list_head action_list;
int ret;
@ -629,13 +696,13 @@ void vmw_fence_fifo_down(struct vmw_fence_manager *fman)
* restart when we've released the fman->lock.
*/
spin_lock_irqsave(&fman->lock, irq_flags);
spin_lock_irq(&fman->lock);
fman->fifo_down = true;
while (!list_empty(&fman->fence_list)) {
struct vmw_fence_obj *fence =
list_entry(fman->fence_list.prev, struct vmw_fence_obj,
head);
kref_get(&fence->kref);
fence_get(&fence->base);
spin_unlock_irq(&fman->lock);
ret = vmw_fence_obj_wait(fence, false, false,
@ -643,20 +710,18 @@ void vmw_fence_fifo_down(struct vmw_fence_manager *fman)
if (unlikely(ret != 0)) {
list_del_init(&fence->head);
fence->signaled = 1;
fence_signal(&fence->base);
INIT_LIST_HEAD(&action_list);
list_splice_init(&fence->seq_passed_actions,
&action_list);
vmw_fences_perform_actions(fman, &action_list);
wake_up_all(&fence->queue);
}
spin_lock_irq(&fman->lock);
BUG_ON(!list_empty(&fence->head));
kref_put(&fence->kref, vmw_fence_obj_destroy_locked);
fence_put(&fence->base);
spin_lock_irq(&fman->lock);
}
spin_unlock_irqrestore(&fman->lock, irq_flags);
spin_unlock_irq(&fman->lock);
}
void vmw_fence_fifo_up(struct vmw_fence_manager *fman)
@ -748,12 +813,12 @@ int vmw_fence_obj_signaled_ioctl(struct drm_device *dev, void *data,
}
fence = &(container_of(base, struct vmw_user_fence, base)->fence);
fman = fence->fman;
fman = fman_from_fence(fence);
arg->signaled = vmw_fence_obj_signaled(fence);
spin_lock_irq(&fman->lock);
arg->signaled_flags = arg->flags;
spin_lock_irq(&fman->lock);
arg->passed_seqno = dev_priv->last_read_seqno;
spin_unlock_irq(&fman->lock);
@ -866,7 +931,7 @@ static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action)
{
struct vmw_event_fence_action *eaction =
container_of(action, struct vmw_event_fence_action, action);
struct vmw_fence_manager *fman = eaction->fence->fman;
struct vmw_fence_manager *fman = fman_from_fence(eaction->fence);
unsigned long irq_flags;
spin_lock_irqsave(&fman->lock, irq_flags);
@ -890,7 +955,7 @@ static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action)
static void vmw_fence_obj_add_action(struct vmw_fence_obj *fence,
struct vmw_fence_action *action)
{
struct vmw_fence_manager *fman = fence->fman;
struct vmw_fence_manager *fman = fman_from_fence(fence);
unsigned long irq_flags;
bool run_update = false;
@ -898,7 +963,7 @@ static void vmw_fence_obj_add_action(struct vmw_fence_obj *fence,
spin_lock_irqsave(&fman->lock, irq_flags);
fman->pending_actions[action->type]++;
if (fence->signaled) {
if (fence_is_signaled_locked(&fence->base)) {
struct list_head action_list;
INIT_LIST_HEAD(&action_list);
@ -950,7 +1015,7 @@ int vmw_event_fence_action_queue(struct drm_file *file_priv,
bool interruptible)
{
struct vmw_event_fence_action *eaction;
struct vmw_fence_manager *fman = fence->fman;
struct vmw_fence_manager *fman = fman_from_fence(fence);
struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
unsigned long irq_flags;
@ -990,7 +1055,8 @@ static int vmw_event_fence_action_create(struct drm_file *file_priv,
bool interruptible)
{
struct vmw_event_fence_pending *event;
struct drm_device *dev = fence->fman->dev_priv->dev;
struct vmw_fence_manager *fman = fman_from_fence(fence);
struct drm_device *dev = fman->dev_priv->dev;
unsigned long irq_flags;
int ret;

27
drivers/gpu/drm/vmwgfx/vmwgfx_fence.h
Просмотреть файл

@ -27,6 +27,8 @@
#ifndef _VMWGFX_FENCE_H_
#include <linux/fence.h>
#define VMW_FENCE_WAIT_TIMEOUT (5*HZ)
struct vmw_private;
@ -50,15 +52,11 @@ struct vmw_fence_action {
};
struct vmw_fence_obj {
struct kref kref;
u32 seqno;
struct fence base;
struct vmw_fence_manager *fman;
struct list_head head;
uint32_t signaled;
struct list_head seq_passed_actions;
void (*destroy)(struct vmw_fence_obj *fence);
wait_queue_head_t queue;
};
extern struct vmw_fence_manager *
@ -66,10 +64,23 @@ vmw_fence_manager_init(struct vmw_private *dev_priv);
extern void vmw_fence_manager_takedown(struct vmw_fence_manager *fman);
extern void vmw_fence_obj_unreference(struct vmw_fence_obj **fence_p);
static inline void
vmw_fence_obj_unreference(struct vmw_fence_obj **fence_p)
{
struct vmw_fence_obj *fence = *fence_p;
extern struct vmw_fence_obj *
vmw_fence_obj_reference(struct vmw_fence_obj *fence);
*fence_p = NULL;
if (fence)
fence_put(&fence->base);
}
static inline struct vmw_fence_obj *
vmw_fence_obj_reference(struct vmw_fence_obj *fence)
{
if (fence)
fence_get(&fence->base);
return fence;
}
extern void vmw_fences_update(struct vmw_fence_manager *fman);

11
drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
Просмотреть файл

@ -160,16 +160,21 @@ int vmw_fifo_init(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
return vmw_fifo_send_fence(dev_priv, &dummy);
}
void vmw_fifo_ping_host(struct vmw_private *dev_priv, uint32_t reason)
void vmw_fifo_ping_host_locked(struct vmw_private *dev_priv, uint32_t reason)
{
__le32 __iomem *fifo_mem = dev_priv->mmio_virt;
mutex_lock(&dev_priv->hw_mutex);
if (unlikely(ioread32(fifo_mem + SVGA_FIFO_BUSY) == 0)) {
iowrite32(1, fifo_mem + SVGA_FIFO_BUSY);
vmw_write(dev_priv, SVGA_REG_SYNC, reason);
}
}
void vmw_fifo_ping_host(struct vmw_private *dev_priv, uint32_t reason)
{
mutex_lock(&dev_priv->hw_mutex);
vmw_fifo_ping_host_locked(dev_priv, reason);
mutex_unlock(&dev_priv->hw_mutex);
}

9
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
Просмотреть файл

@ -1420,21 +1420,20 @@ void vmw_fence_single_bo(struct ttm_buffer_object *bo,
struct vmw_fence_obj *fence)
{
struct ttm_bo_device *bdev = bo->bdev;
struct ttm_bo_driver *driver = bdev->driver;
struct vmw_fence_obj *old_fence_obj;
struct vmw_private *dev_priv =
container_of(bdev, struct vmw_private, bdev);
if (fence == NULL)
if (fence == NULL) {
vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
else
driver->sync_obj_ref(fence);
} else
vmw_fence_obj_reference(fence);
reservation_object_add_excl_fence(bo->resv, &fence->base);
old_fence_obj = bo->sync_obj;
bo->sync_obj = fence;
if (old_fence_obj)
vmw_fence_obj_unreference(&old_fence_obj);
}