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Commit 8432bdb2 authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Jens Axboe
Browse files

nvme: Make controller state visible via sysfs 



Easier for debugging and testing state machine
transitions.

Signed-off-by: default avatarSagi Grimberg <sagi@grimberg.me>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 15fbad96

drivers/nvme/host/core.c

+24 −0
Original line number Diff line number Diff line
@@ -1577,6 +1577,29 @@ static ssize_t nvme_sysfs_show_transport(struct device *dev, 
}

static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL);



static ssize_t nvme_sysfs_show_state(struct device *dev,

				     struct device_attribute *attr,

				     char *buf)

{

	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	static const char *const state_name[] = {

		[NVME_CTRL_NEW]		= "new",

		[NVME_CTRL_LIVE]	= "live",

		[NVME_CTRL_RESETTING]	= "resetting",

		[NVME_CTRL_RECONNECTING]= "reconnecting",

		[NVME_CTRL_DELETING]	= "deleting",

		[NVME_CTRL_DEAD]	= "dead",

	};



	if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) &&

	    state_name[ctrl->state])

		return sprintf(buf, "%s\n", state_name[ctrl->state]);



	return sprintf(buf, "unknown state\n");

}



static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL);



static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,

					 struct device_attribute *attr,

					 char *buf)
@@ -1609,6 +1632,7 @@ static struct attribute *nvme_dev_attrs[] = { 
	&dev_attr_transport.attr,

	&dev_attr_subsysnqn.attr,

	&dev_attr_address.attr,

	&dev_attr_state.attr,

	NULL

};