diff options
Diffstat (limited to 'drivers/nvme/host/multipath.c')
| -rw-r--r-- | drivers/nvme/host/multipath.c | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 13e5d503ed07..f8bf6606eb2f 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -13,6 +13,42 @@ module_param(multipath, bool, 0444); MODULE_PARM_DESC(multipath, "turn on native support for multiple controllers per subsystem"); +static const char *nvme_iopolicy_names[] = { + [NVME_IOPOLICY_NUMA] = "numa", + [NVME_IOPOLICY_RR] = "round-robin", +}; + +static int iopolicy = NVME_IOPOLICY_NUMA; + +static int nvme_set_iopolicy(const char *val, const struct kernel_param *kp) +{ + if (!val) + return -EINVAL; + if (!strncmp(val, "numa", 4)) + iopolicy = NVME_IOPOLICY_NUMA; + else if (!strncmp(val, "round-robin", 11)) + iopolicy = NVME_IOPOLICY_RR; + else + return -EINVAL; + + return 0; +} + +static int nvme_get_iopolicy(char *buf, const struct kernel_param *kp) +{ + return sprintf(buf, "%s\n", nvme_iopolicy_names[iopolicy]); +} + +module_param_call(iopolicy, nvme_set_iopolicy, nvme_get_iopolicy, + &iopolicy, 0644); +MODULE_PARM_DESC(iopolicy, + "Default multipath I/O policy; 'numa' (default) or 'round-robin'"); + +void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys) +{ + subsys->iopolicy = iopolicy; +} + void nvme_mpath_unfreeze(struct nvme_subsystem *subsys) { struct nvme_ns_head *h; @@ -706,11 +742,6 @@ void nvme_mpath_stop(struct nvme_ctrl *ctrl) struct device_attribute subsys_attr_##_name = \ __ATTR(_name, _mode, _show, _store) -static const char *nvme_iopolicy_names[] = { - [NVME_IOPOLICY_NUMA] = "numa", - [NVME_IOPOLICY_RR] = "round-robin", -}; - static ssize_t nvme_subsys_iopolicy_show(struct device *dev, struct device_attribute *attr, char *buf) { |