drivers/iommu: Add pg fault worker queue prio

ascend inclusion
category: bugfix
bugzilla: NA
CVE: NA

-------------------

IO page fault can not be handled in time, because of low priority.
Increase priority of IO page fault worker queue to WQ_HIGHPRI.
Signed-off-by: NJiankang Chen <chenjiankang1@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NLijun Fang <fanglijun3@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/iommu/io-pgfault.c

@@ -410,7 +410,11 @@ iopf_queue_alloc(const char *name, iopf_queue_flush_t flush, void *cookie)
 	 * that's dealt with, the high-level function can handle groups out of
 	 * order.
 	 */
+#ifdef CONFIG_ARCH_ASCEND
+	queue->wq = alloc_workqueue("iopf_queue/%s", WQ_HIGHPRI, 0, name);
+#else
 	queue->wq = alloc_workqueue("iopf_queue/%s", WQ_UNBOUND, 0, name);
+#endif
 	if (!queue->wq) {
 		kfree(queue);
 		return NULL;