diff mbox series

[v4,5/8] pm80xx: Add sysfs attribute to track iop1 count

Message ID 20210415103352.3580-6-Viswas.G@microchip.com
State Superseded
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_iop1_count' is being introduced that tells if
the controller is alive by indicating controller ticks. If on subsequent
run we see the ticks changing that indicates that controller is not
dead.

Tested: Using 'ctl_iop1_count' sysfs variable we can see ticks
incrementing
linux-9saw:~# cat  /sys/class/scsi_host/host*/ctl_iop1_count
0x00000069
0x0000006b
0x0000006d
0x00000072

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: Ashokkumar N <Ashokkumar.N@microchip.com>
Signed-off-by: Radha Ramachandran <radha@google.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
---
 drivers/scsi/pm8001/pm8001_ctl.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
diff mbox series

Patch

diff --git a/drivers/scsi/pm8001/pm8001_ctl.c b/drivers/scsi/pm8001/pm8001_ctl.c
index b1c351dd2704..f3c9fd067272 100644
--- a/drivers/scsi/pm8001/pm8001_ctl.c
+++ b/drivers/scsi/pm8001/pm8001_ctl.c
@@ -978,6 +978,28 @@  static ssize_t ctl_iop0_count_show(struct device *cdev,
 }
 static DEVICE_ATTR_RO(ctl_iop0_count);
 
+/**
+ * ctl_iop1_count_show - controller iop1 count check
+ * @cdev: pointer to embedded class device
+ * @buf: the buffer returned
+ *
+ * A sysfs 'read-only' shost attribute.
+ */
+
+static ssize_t ctl_iop1_count_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 iop1cnt;
+
+	iop1cnt = pm8001_mr32(pm8001_ha->general_stat_tbl_addr, 20);
+	return sysfs_emit(buf, "0x%08x\n", iop1cnt);
+
+}
+static DEVICE_ATTR_RO(ctl_iop1_count);
+
 struct device_attribute *pm8001_host_attrs[] = {
 	&dev_attr_interface_rev,
 	&dev_attr_controller_fatal_error,
@@ -1005,6 +1027,7 @@  struct device_attribute *pm8001_host_attrs[] = {
 	&dev_attr_ctl_hmi_error,
 	&dev_attr_ctl_raae_count,
 	&dev_attr_ctl_iop0_count,
+	&dev_attr_ctl_iop1_count,
 	NULL,
 };