crypto: hisilicon/zip - add a work_queue for zip irq

The patch 'irqchip/gic-v3-its: Balance initial LPI affinity across CPUs'
set the IRQ to an uncentain CPU. If an IRQ is bound to the CPU used by the
thread which is sending request, the throughput will be just half.

So allocate a 'work_queue' and set as 'WQ_UNBOUND' to do the back half work
on some different CPUS.
Signed-off-by: Yang Shen <shenyang39@huawei.com>
Reviewed-by: Zaibo Xu <xuzaibo@huawei.com>
Reviewed-by: Zhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/hisilicon/zip/zip_main.c

@@ -747,6 +747,8 @@ static int hisi_zip_pf_probe_init(struct hisi_zip *hisi_zip)
 
 static int hisi_zip_qm_init(struct hisi_qm *qm, struct pci_dev *pdev)
 {
+	int ret;
+
 	qm->pdev = pdev;
 	qm->ver = pdev->revision;
 	qm->algs = "zlib\ngzip";
@@ -772,7 +774,25 @@ static int hisi_zip_qm_init(struct hisi_qm *qm, struct pci_dev *pdev)
 		qm->qp_num = HZIP_QUEUE_NUM_V1 - HZIP_PF_DEF_Q_NUM;
 	}
 
-	return hisi_qm_init(qm);
+	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;
+	}
+
+	ret = hisi_qm_init(qm);
+	if (ret)
+		destroy_workqueue(qm->wq);
+
+	return ret;
+}
+
+static void hisi_zip_qm_uninit(struct hisi_qm *qm)
+{
+	hisi_qm_uninit(qm);
+	destroy_workqueue(qm->wq);
 }
 
 static int hisi_zip_probe_init(struct hisi_zip *hisi_zip)
@@ -854,7 +874,7 @@ static int hisi_zip_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	hisi_qm_dev_err_uninit(qm);
 
 err_qm_uninit:
-	hisi_qm_uninit(qm);
+	hisi_zip_qm_uninit(qm);
 
 	return ret;
 }
@@ -872,7 +892,7 @@ static void hisi_zip_remove(struct pci_dev *pdev)
 	hisi_zip_debugfs_exit(qm);
 	hisi_qm_stop(qm, QM_NORMAL);
 	hisi_qm_dev_err_uninit(qm);
-	hisi_qm_uninit(qm);
+	hisi_zip_qm_uninit(qm);
 }
 
 static const struct pci_error_handlers hisi_zip_err_handler = {