[RFC PATCH v3 15/19] scsi: mpt3sas: Add param to control target based error handle

[JiangJianJun]

From: Wenchao Hao <haowenchao2@xxxxxxxxxx>

Add new module param target_eh to control if enable target based
error handle, since mpt3sas defined callback eh_host_reset, so make
it fallback to further recover when target based recovery can not
recover all error commands.

Signed-off-by: Wenchao Hao <haowenchao2@xxxxxxxxxx>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index b3ceba3c1ea8..6f3eced511bf 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -177,6 +177,10 @@ static bool lun_eh;
 module_param(lun_eh, bool, 0444);
 MODULE_PARM_DESC(lun_eh, "LUN based error handle (def=0)");
 
+static bool target_eh;
+module_param(target_eh, bool, 0444);
+MODULE_PARM_DESC(target_eh, "target based error handle (def=0)");
+
 /* raid transport support */
 static struct raid_template *mpt3sas_raid_template;
 static struct raid_template *mpt2sas_raid_template;
@@ -1878,6 +1882,13 @@ scsih_target_alloc(struct scsi_target *starget)
 	struct _pcie_device *pcie_device;
 	unsigned long flags;
 	struct sas_rphy *rphy;
+	int ret = 0;
+
+	if (target_eh) {
+		ret = scsi_target_setup_eh(starget, 1);
+		if (ret)
+			return ret;
+	}
 
 	sas_target_priv_data = kzalloc(sizeof(*sas_target_priv_data),
 				       GFP_KERNEL);
@@ -1968,6 +1979,9 @@ scsih_target_destroy(struct scsi_target *starget)
 	struct _pcie_device *pcie_device;
 	unsigned long flags;
 
+	if (target_eh)
+		scsi_target_clear_eh(starget);
+
 	sas_target_priv_data = starget->hostdata;
 	if (!sas_target_priv_data)
 		return;
-- 
2.33.0