From: Hannes Reinecke <hare@suse.de>
Date: Fri, 16 Apr 2021 13:46:21 +0200
Subject: nvme: add 'kato' sysfs attribute
Patch-mainline: v5.13-rc1
Git-commit: 74c22990f08c9f922f775939a4ebc814ca2c49eb
References: bsc#1179825

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>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/nvme/host/core.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3254,6 +3254,7 @@ 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,
@@ -3419,6 +3420,7 @@ static struct attribute *nvme_dev_attrs[
 	&dev_attr_hostid.attr,
 	&dev_attr_ctrl_loss_tmo.attr,
 	&dev_attr_reconnect_delay.attr,
+	&dev_attr_kato.attr,
 	NULL
 };