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path: root/drivers/nvme/host/multipath.c
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Diffstat (limited to 'drivers/nvme/host/multipath.c')
-rw-r--r--drivers/nvme/host/multipath.c41
1 files changed, 36 insertions, 5 deletions
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 7f2071f2460c..892bd5dcb46b 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)
{