[PATCH 2/7] pm80xx: Add sysfs attribute to track RAAE count
From: Viswas G <hidden>
Date: 2021-02-24 16:11:42
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_raae_count' is being introduced that tells if the controller is alive by indicating controller ticks. If on subsequent run we see the ticks changing in RAAE count that indicates that controller is not dead. Tested: Using 'ctl_raae_count' sysfs variable we can see ticks incrementing mvae14:~# cat /sys/class/scsi_host/host*/ctl_raae_count MSGUTCNT=0x00002245 MSGUTCNT=0x00002253 MSGUTCNT=0x0000225e 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> --- drivers/scsi/pm8001/pm8001_ctl.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/drivers/scsi/pm8001/pm8001_ctl.c b/drivers/scsi/pm8001/pm8001_ctl.c
index 035969ed1c2e..d415bb12718c 100644
--- a/drivers/scsi/pm8001/pm8001_ctl.c
+++ b/drivers/scsi/pm8001/pm8001_ctl.c@@ -919,6 +919,30 @@ static ssize_t ctl_mpi_state_show(struct device *cdev, } static DEVICE_ATTR_RO(ctl_mpi_state); +/** + * ctl_raae_count_show - controller raae count check + * @cdev: pointer to embedded class device + * @buf: the buffer returned + * + * A sysfs 'read-only' shost attribute. + */ + +static ssize_t ctl_raae_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 raaecnt = 0; + int c; + + pm8001_dbg(pm8001_ha, IOCTL, "%s\n", __func__); + raaecnt = pm8001_mr32(pm8001_ha->general_stat_tbl_addr, 12); + c = sprintf(buf, "MSGUTCNT=0x%08x\n", raaecnt); + return c; +} +static DEVICE_ATTR_RO(ctl_raae_count); + struct device_attribute *pm8001_host_attrs[] = { &dev_attr_interface_rev, &dev_attr_controller_fatal_error,
@@ -943,6 +967,7 @@ struct device_attribute *pm8001_host_attrs[] = { &dev_attr_ila_version, &dev_attr_inc_fw_ver, &dev_attr_ctl_mpi_state, + &dev_attr_ctl_raae_count, NULL, };
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2.16.3