int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
bool write = !!(op & MSM_PREP_WRITE);
unsigned long remain =
op & MSM_PREP_NOSYNC ? 0 : timeout_to_jiffies(timeout);
long ret;
ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
true, remain);
if (ret == 0)
return remain == 0 ? -EBUSY : -ETIMEDOUT;
else if (ret < 0)
return ret;
/* TODO cache maintenance */
return 0;
}
int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
bool write = !!(op & MSM_PREP_WRITE);
if (op & MSM_PREP_NOSYNC) {
if (!reservation_object_test_signaled_rcu(msm_obj->resv, write))
return -EBUSY;
} else {
int ret;
ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
true, timeout_to_jiffies(timeout));
if (ret <= 0)
return ret == 0 ? -ETIMEDOUT : ret;
}
/* TODO cache maintenance */
return 0;
}
