crypto: hisilicon/sec2 - Add workqueue for SEC driver.

Allocate one workqueue for each QM instead of one for all QMs,
we found the throughput of SEC engine can be increased to
the hardware limit throughput during testing sec2 performance.
so we added this scheme.

Signed-off-by: Ye Kai <yekai13@huawei.com>
Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Signed-off-by: Zaibo Xu <xuzaibo@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/hisilicon/sec2/sec_main.c

@@ -774,12 +774,30 @@ static void sec_qm_uninit(struct hisi_qm *qm)
 
 static int sec_probe_init(struct hisi_qm *qm, struct sec_dev *sec)
 {
+	int ret;
+
+	/*
+	 * WQ_HIGHPRI: SEC request must be low delayed,
+	 * so need a high priority workqueue.
+	 * WQ_UNBOUND: SEC task is likely with long
+	 * running CPU intensive workloads.
+	 */
+	qm->wq = alloc_workqueue("%s", WQ_HIGHPRI |
+		WQ_MEM_RECLAIM | WQ_UNBOUND, num_online_cpus(),
+		pci_name(qm->pdev));
+	if (!qm->wq) {
+		pci_err(qm->pdev, "fail to alloc workqueue\n");
+		return -ENOMEM;
+	}
+
 	if (qm->fun_type == QM_HW_PF) {
 		qm->qp_base = SEC_PF_DEF_Q_BASE;
 		qm->qp_num = pf_q_num;
 		qm->debug.curr_qm_qp_num = pf_q_num;
 
-		return sec_pf_probe_init(sec);
+		ret = sec_pf_probe_init(sec);
+		if (ret)
+			goto err_probe_uninit;
 	} else if (qm->fun_type == QM_HW_VF) {
 		/*
 		 * have no way to get qm configure in VM in v1 hardware,
@@ -792,18 +810,26 @@ static int sec_probe_init(struct hisi_qm *qm, struct sec_dev *sec)
 			qm->qp_num = SEC_QUEUE_NUM_V1 - SEC_PF_DEF_Q_NUM;
 		} else if (qm->ver == QM_HW_V2) {
 			/* v2 starts to support get vft by mailbox */
-			return hisi_qm_get_vft(qm, &qm->qp_base, &qm->qp_num);
+			ret = hisi_qm_get_vft(qm, &qm->qp_base, &qm->qp_num);
+			if (ret)
+				goto err_probe_uninit;
 		}
 	} else {
-		return -ENODEV;
+		ret = -ENODEV;
+		goto err_probe_uninit;
 	}
 
 	return 0;
+err_probe_uninit:
+	destroy_workqueue(qm->wq);
+	return ret;
 }
 
 static void sec_probe_uninit(struct hisi_qm *qm)
 {
 	hisi_qm_dev_err_uninit(qm);
+
+	destroy_workqueue(qm->wq);
 }
 
 static int sec_probe(struct pci_dev *pdev, const struct pci_device_id *id)