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authorSagi Grimberg <sagi@grimberg.me>2016-11-28 01:47:40 +0200
committerJens Axboe <axboe@fb.com>2017-02-22 13:34:00 -0700
commit8432bdb2905713cb3ef5cbe4a72630fa575565ad (patch)
treea70caa934fa285b6077925fa510a3fa04299ed72 /drivers/nvme
parent15fbad96fc5fb1c5a0502e6a10dea671f510de3d (diff)
downloadlinux-8432bdb2905713cb3ef5cbe4a72630fa575565ad.tar.bz2
nvme: Make controller state visible via sysfs
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>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/core.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 44a1a257e0b5..d52978038621 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -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
};