From: Hannes Reinecke <hare@suse.de>
Date: Fri, 16 Apr 2021 11:46:21 +0000 (+0200)
Subject: nvme: add 'kato' sysfs attribute
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=74c22990f08c9f922f775939a4ebc814ca2c49eb;p=linux.git

nvme: add 'kato' sysfs attribute

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>
---

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 0cb097cd6a8e6..d6fd44774e9f6 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -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
 };