diff mbox series

[v4,2/8] pm80xx: Add sysfs attribute to check controller hmi error

Message ID 20210415103352.3580-3-Viswas.G@microchip.com
State New
Headers show
Series pm80xx updates | expand

Commit Message

Viswas G April 15, 2021, 10:33 a.m. UTC 
From: Vishakha Channapattan <vishakhavc@google.com>

A new sysfs variable 'ctl_hmi_error' is being introduced to
give the error details if the MPI initialization fails

Tested: Using 'ctl_hmi_error' sysfs variable we check the error details
linux-2dq0:~# cat /sys/class/scsi_host/host*/ctl_hmi_error
0x00000000
0x00000000
0x00000000

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>
---
 drivers/scsi/pm8001/pm8001_ctl.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
diff mbox series

Patch

diff --git a/drivers/scsi/pm8001/pm8001_ctl.c b/drivers/scsi/pm8001/pm8001_ctl.c
index a93799bd3a32..b1f105253a12 100644
--- a/drivers/scsi/pm8001/pm8001_ctl.c
+++ b/drivers/scsi/pm8001/pm8001_ctl.c
@@ -915,6 +915,27 @@  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,
@@ -939,6 +960,7 @@  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,
 };