scsi: hisi_sas: add host reset interface for test

Add host reset interface to make it easier for testing the host reset
feature.
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -2234,6 +2234,19 @@ void hisi_sas_kill_tasklets(struct hisi_hba *hisi_hba)
 }
 EXPORT_SYMBOL_GPL(hisi_sas_kill_tasklets);
 
+int hisi_sas_host_reset(struct Scsi_Host *shost, int reset_type)
+{
+	struct hisi_hba *hisi_hba = shost_priv(shost);
+
+	if (reset_type != SCSI_ADAPTER_RESET)
+		return -EOPNOTSUPP;
+
+	queue_work(hisi_hba->wq, &hisi_hba->rst_work);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hisi_sas_host_reset);
+
 struct scsi_transport_template *hisi_sas_stt;
 EXPORT_SYMBOL_GPL(hisi_sas_stt);
 

drivers/scsi/hisi_sas/hisi_sas_v1_hw.c

@@ -1823,6 +1823,7 @@ static struct scsi_host_template sht_v1_hw = {
 	.target_destroy		= sas_target_destroy,
 	.ioctl			= sas_ioctl,
 	.shost_attrs		= host_attrs_v1_hw,
+	.host_reset             = hisi_sas_host_reset,
 };
 
 static const struct hisi_sas_hw hisi_sas_v1_hw = {

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

@@ -3599,6 +3599,7 @@ static struct scsi_host_template sht_v2_hw = {
 	.target_destroy		= sas_target_destroy,
 	.ioctl			= sas_ioctl,
 	.shost_attrs		= host_attrs_v2_hw,
+	.host_reset		= hisi_sas_host_reset,
 };
 
 static const struct hisi_sas_hw hisi_sas_v2_hw = {

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -2678,6 +2678,7 @@ static struct scsi_host_template sht_v3_hw = {
 	.ioctl			= sas_ioctl,
 	.shost_attrs		= host_attrs_v3_hw,
 	.tag_alloc_policy	= BLK_TAG_ALLOC_RR,
+	.host_reset             = hisi_sas_host_reset,
 };
 
 static const struct hisi_sas_hw hisi_sas_v3_hw = {