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>
---
 drivers/nvme/host/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 1d5fc8a6fd37..9ad23472ac15 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c

@@ -3547,6 +3547,7 @@ 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,

@@ -3749,6 +3750,7 @@ static struct attribute *nvme_dev_attrs[] = {
        &dev_attr_ctrl_loss_tmo.attr,
        &dev_attr_fast_io_fail_tmo.attr,
        &dev_attr_reconnect_delay.attr,
+       &dev_attr_kato.attr,
        NULL
 };