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nvme: Make controller state visible via sysfs

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Easier for debugging and testing state machine
transitions.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Sagi Grimberg 2016-11-28 01:47:40 +02:00 committed by Jens Axboe
parent 15fbad96fc
commit 8432bdb290
1 changed files with 24 additions and 0 deletions
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24
drivers/nvme/host/core.c
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@ -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
};