diff options
author | Sagi Grimberg <sagi@grimberg.me> | 2020-07-05 00:57:55 -0700 |
---|---|---|
committer | Christoph Hellwig <hch@lst.de> | 2020-07-08 16:16:20 +0200 |
commit | 764075fdcb2f09baa23fdc4df4b79741e5c39b57 (patch) | |
tree | fbb0d8a5cd13ebd3ad8b1a7a3a6f9e0631999eb5 /drivers/nvme | |
parent | 240e6ee272c07a2636dfc7d65f5bbb18377c49e5 (diff) | |
download | linux-764075fdcb2f09baa23fdc4df4b79741e5c39b57.tar.bz2 |
nvme: expose reconnect_delay and ctrl_loss_tmo via sysfs
This is useful information, and moreover its it's useful to
be able to alter these parameters per controller after it
has been established.
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
-rw-r--r-- | drivers/nvme/host/core.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index a8ee10a0cd32..4aaffc4fa150 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3535,6 +3535,66 @@ static ssize_t nvme_sysfs_show_address(struct device *dev, } static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL); +static ssize_t nvme_ctrl_loss_tmo_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + struct nvmf_ctrl_options *opts = ctrl->opts; + + if (ctrl->opts->max_reconnects == -1) + return sprintf(buf, "off\n"); + return sprintf(buf, "%d\n", + opts->max_reconnects * opts->reconnect_delay); +} + +static ssize_t nvme_ctrl_loss_tmo_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + struct nvmf_ctrl_options *opts = ctrl->opts; + int ctrl_loss_tmo, err; + + err = kstrtoint(buf, 10, &ctrl_loss_tmo); + if (err) + return -EINVAL; + + else if (ctrl_loss_tmo < 0) + opts->max_reconnects = -1; + else + opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo, + opts->reconnect_delay); + return count; +} +static DEVICE_ATTR(ctrl_loss_tmo, S_IRUGO | S_IWUSR, + nvme_ctrl_loss_tmo_show, nvme_ctrl_loss_tmo_store); + +static ssize_t nvme_ctrl_reconnect_delay_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + + if (ctrl->opts->reconnect_delay == -1) + return sprintf(buf, "off\n"); + return sprintf(buf, "%d\n", ctrl->opts->reconnect_delay); +} + +static ssize_t nvme_ctrl_reconnect_delay_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + unsigned int v; + int err; + + err = kstrtou32(buf, 10, &v); + if (err || v > UINT_MAX) + return -EINVAL; + + ctrl->opts->reconnect_delay = v; + return count; +} +static DEVICE_ATTR(reconnect_delay, S_IRUGO | S_IWUSR, + nvme_ctrl_reconnect_delay_show, nvme_ctrl_reconnect_delay_store); + static struct attribute *nvme_dev_attrs[] = { &dev_attr_reset_controller.attr, &dev_attr_rescan_controller.attr, @@ -3552,6 +3612,8 @@ static struct attribute *nvme_dev_attrs[] = { &dev_attr_sqsize.attr, &dev_attr_hostnqn.attr, &dev_attr_hostid.attr, + &dev_attr_ctrl_loss_tmo.attr, + &dev_attr_reconnect_delay.attr, NULL }; |