On Wed, Mar 24, 2021 at 5:54 PM Viswas G <Viswas.G@xxxxxxxxxxxxx> wrote:
>
> From: Vishakha Channapattan <vishakhavc@xxxxxxxxxx>
>
> 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
> 0x00002245
> 0x00002253
> 0x0000225e
>
> Signed-off-by: Vishakha Channapattan <vishakhavc@xxxxxxxxxx>
> Signed-off-by: Viswas G <Viswas.G@xxxxxxxxxxxxx>
> Signed-off-by: Ruksar Devadi <Ruksar.devadi@xxxxxxxxxxxxx>
> Signed-off-by: Ashokkumar N <Ashokkumar.N@xxxxxxxxxxxxx>
> Signed-off-by: Radha Ramachandran <radha@xxxxxxxxxx>
Acked-by: Jack Wang <jinpu.wang@xxxxxxxxx>
> ---
> 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 ce4846b1377c..98e5b47b9bb7 100644
> --- a/drivers/scsi/pm8001/pm8001_ctl.c
> +++ b/drivers/scsi/pm8001/pm8001_ctl.c
> @@ -918,6 +918,29 @@ 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;
> + int c;
> +
> + raaecnt = pm8001_mr32(pm8001_ha->general_stat_tbl_addr, 12);
> + c = sysfs_emit(buf, "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,
> @@ -942,6 +965,7 @@ 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,
> };
>
> --
> 2.16.3
>
