From a4c55e16c50022825966864cf1f08b9efa3ebb86 Mon Sep 17 00:00:00 2001
From: Vishakha Channapattan <vishakhavc@google.com>
Date: Thu, 15 Apr 2021 16:03:46 +0530
Subject: [PATCH] scsi: pm80xx: Add sysfs attribute to check controller hmi
error
A new sysfs variable 'ctl_hmi_error' is being introduced to give the error
details if the MPI initialization fails
Using the 'ctl_hmi_error' sysfs variable we can check the error details:
linux-2dq0:~# cat /sys/class/scsi_host/host*/ctl_hmi_error
0x00000000
0x00000000
0x00000000
Link: https://lore.kernel.org/r/20210415103352.3580-3-Viswas.G@microchip.com
Signed-off-by: Vishakha Channapattan <vishakhavc@google.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Ruksar Devadi <Ruksar.devadi@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
drivers/scsi/pm8001/pm8001_ctl.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/scsi/pm8001/pm8001_ctl.c b/drivers/scsi/pm8001/pm8001_ctl.c
index f3863076a81ec..786bd2d252b67 100644
--- a/drivers/scsi/pm8001/pm8001_ctl.c
+++ b/drivers/scsi/pm8001/pm8001_ctl.c
@@ -911,6 +911,27 @@ static ssize_t ctl_mpi_state_show(struct device *cdev,
}
static DEVICE_ATTR_RO(ctl_mpi_state);
+/**
+ * ctl_hmi_error_show - controller MPI initialization fails
+ * @cdev: pointer to embedded class device
+ * @buf: the buffer returned
+ *
+ * A sysfs 'read-only' shost attribute.
+ */
+
+static ssize_t ctl_hmi_error_show(struct device *cdev,
+ struct device_attribute *attr, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(cdev);
+ struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
+ struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
+ unsigned int mpidw0;
+
+ mpidw0 = pm8001_mr32(pm8001_ha->general_stat_tbl_addr, 0);
+ return sysfs_emit(buf, "0x%08x\n", (mpidw0 >> 16));
+}
+static DEVICE_ATTR_RO(ctl_hmi_error);
+
struct device_attribute *pm8001_host_attrs[] = {
&dev_attr_interface_rev,
&dev_attr_controller_fatal_error,
@@ -935,6 +956,7 @@ struct device_attribute *pm8001_host_attrs[] = {
&dev_attr_ila_version,
&dev_attr_inc_fw_ver,
&dev_attr_ctl_mpi_state,
+ &dev_attr_ctl_hmi_error,
NULL,
};
--
2.30.2