[PATCH v3 3/7] pm80xx: Add sysfs attribute to track iop0 count
From: Viswas G <hidden>
Date: 2021-03-30 06:31:41
Subsystem:
pmc sierra pm8001 driver, scsi subsystem, the rest · Maintainers:
Jack Wang, "James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
From: Vishakha Channapattan <redacted> A new sysfs variable 'ctl_iop0_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_iop0_count' sysfs variable we can see ticks incrementing mvae14:~# cat /sys/class/scsi_host/host*/ctl_iop0_count 0x000000a3 0x000001db 0x000001e4 0x000001e7 Signed-off-by: Vishakha Channapattan <redacted> Signed-off-by: Viswas G <redacted> Signed-off-by: Ruksar Devadi <redacted> Signed-off-by: Ashokkumar N <redacted> Signed-off-by: Radha Ramachandran <redacted> Acked-by: Jack Wang <jinpu.wang@ionos.com> --- drivers/scsi/pm8001/pm8001_ctl.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/drivers/scsi/pm8001/pm8001_ctl.c b/drivers/scsi/pm8001/pm8001_ctl.c
index 890d6faf18e9..dd546d2c35d7 100644
--- a/drivers/scsi/pm8001/pm8001_ctl.c
+++ b/drivers/scsi/pm8001/pm8001_ctl.c@@ -941,6 +941,29 @@ static ssize_t ctl_raae_count_show(struct device *cdev, } static DEVICE_ATTR_RO(ctl_raae_count); +/** + * ctl_iop0_count_show - controller iop0 count check + * @cdev: pointer to embedded class device + * @buf: the buffer returned + * + * A sysfs 'read-only' shost attribute. + */ + +static ssize_t ctl_iop0_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 iop0cnt; + int c; + + iop0cnt = pm8001_mr32(pm8001_ha->general_stat_tbl_addr, 16); + c = sysfs_emit(buf, "0x%08x\n", iop0cnt); + return c; +} +static DEVICE_ATTR_RO(ctl_iop0_count); + struct device_attribute *pm8001_host_attrs[] = { &dev_attr_interface_rev, &dev_attr_controller_fatal_error,
@@ -966,6 +989,7 @@ struct device_attribute *pm8001_host_attrs[] = { &dev_attr_inc_fw_ver, &dev_attr_ctl_mpi_state, &dev_attr_ctl_raae_count, + &dev_attr_ctl_iop0_count, NULL, };
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2.16.3