static unsigned int sync_file_poll(struct file *file, poll_table *wait)
{
struct sync_file *sync_file = file->private_data;
poll_wait(file, &sync_file->wq, wait);
if (!poll_does_not_wait(wait) &&
!test_and_set_bit(POLL_ENABLED, &sync_file->fence->flags)) {
if (fence_add_callback(sync_file->fence, &sync_file->cb,
fence_check_cb_func) < 0)
wake_up_all(&sync_file->wq);
}
return fence_is_signaled(sync_file->fence) ? POLLIN : 0;
}
static int
reservation_cb_add_fence_cb(struct drm_reservation_cb *rcb, struct fence *fence)
{
int ret = 0;
struct drm_reservation_fence_cb *fence_cb;
struct drm_reservation_fence_cb **new_fence_cbs;
new_fence_cbs = krealloc(rcb->fence_cbs,
(rcb->num_fence_cbs + 1)
* sizeof(struct drm_reservation_fence_cb *),
GFP_KERNEL);
if (!new_fence_cbs)
return -ENOMEM;
rcb->fence_cbs = new_fence_cbs;
fence_cb = kzalloc(sizeof(struct drm_reservation_fence_cb), GFP_KERNEL);
if (!fence_cb)
return -ENOMEM;
/*
* do not want for fence to disappear on us while we are waiting for
* callback and we need it in case we want to remove callbacks
*/
fence_get(fence);
fence_cb->fence = fence;
fence_cb->parent = rcb;
rcb->fence_cbs[rcb->num_fence_cbs] = fence_cb;
atomic_inc(&rcb->count);
ret = fence_add_callback(fence, &fence_cb->base,
reservation_cb_fence_cb);
if (ret == -ENOENT) {
/* already signaled */
atomic_dec(&rcb->count);
fence_put(fence_cb->fence);
kfree(fence_cb);
ret = 0;
} else if (ret < 0) {
atomic_dec(&rcb->count);
fence_put(fence_cb->fence);
kfree(fence_cb);
return ret;
} else {
rcb->num_fence_cbs++;
}
return ret;
}
