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nvme: add 'kato' sysfs attribute

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Add a 'kato' controller sysfs attribute to display the current
keep-alive timeout value (if any). This allows userspace to identify
persistent discovery controllers, as these will have a non-zero
KATO value.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke 2021-04-16 13:46:21 +02:00 committed by Christoph Hellwig
parent a70b81bd4d
commit 74c22990f0
1 changed files with 2 additions and 0 deletions
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2
drivers/nvme/host/core.c
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@ -3172,6 +3172,7 @@ nvme_show_int_function(cntlid);
nvme_show_int_function(numa_node);
nvme_show_int_function(queue_count);
nvme_show_int_function(sqsize);
nvme_show_int_function(kato);
static ssize_t nvme_sysfs_delete(struct device *dev,
struct device_attribute *attr, const char *buf,
@ -3369,6 +3370,7 @@ static struct attribute *nvme_dev_attrs[] = {
&dev_attr_ctrl_loss_tmo.attr,
&dev_attr_reconnect_delay.attr,
&dev_attr_fast_io_fail_tmo.attr,
&dev_attr_kato.attr,
NULL
};