mi: add power management feature functions

The feature is optional for the management endpoint support.

Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>

Author: ikegami-t

src/libnvme.map

@@ -2,6 +2,8 @@
 LIBNVME_UNRELEASED {
 	global:
 		nvme_mi_admin_get_features_arbitration;
+		nvme_mi_admin_get_features_power_mgmt;
+		nvme_mi_admin_set_features_power_mgmt;
 };
 
 LIBNVME_1_14 {

src/nvme/mi.c

@@ -1423,6 +1423,12 @@ int nvme_mi_admin_get_features_arbitration(nvme_mi_ctrl_t ctrl, enum nvme_get_fe
 	return __nvme_mi_admin_get_features(ctrl, NVME_FEAT_FID_ARBITRATION, sel, result);
 }
 
+int nvme_mi_admin_get_features_power_mgmt(nvme_mi_ctrl_t ctrl, enum nvme_get_features_sel sel,
+					  __u32 *result)
+{
+	return __nvme_mi_admin_get_features(ctrl, NVME_FEAT_FID_POWER_MGMT, sel, result);
+}
+
 int nvme_mi_admin_set_features(nvme_mi_ctrl_t ctrl,
 			       struct nvme_set_features_args *args)
 {
@@ -1467,6 +1473,33 @@ int nvme_mi_admin_set_features(nvme_mi_ctrl_t ctrl,
 	return 0;
 }
 
+static int __nvme_mi_admin_set_features(nvme_mi_ctrl_t ctrl, __u8 fid, __u32 cdw11, bool save,
+					__u32 *result)
+{
+	struct nvme_set_features_args args = {
+		.args_size = sizeof(args),
+		.nsid = NVME_NSID_NONE,
+		.cdw11 = cdw11,
+		.cdw12 = 0,
+		.save = save,
+		.uuidx = NVME_UUID_NONE,
+		.cdw15 = 0,
+		.data_len = 0,
+		.data = NULL,
+		.timeout = NVME_DEFAULT_IOCTL_TIMEOUT,
+		.result = result,
+	};
+	return nvme_mi_admin_set_features(ctrl, &args);
+}
+
+int nvme_mi_admin_set_features_power_mgmt(nvme_mi_ctrl_t ctrl, __u8 ps, __u8 wh, bool save,
+					  __u32 *result)
+{
+	__u32 value = NVME_SET(ps, FEAT_PWRMGMT_PS) | NVME_SET(wh, FEAT_PWRMGMT_WH);
+
+	return __nvme_mi_admin_set_features(ctrl, NVME_FEAT_FID_POWER_MGMT, value, save, result);
+}
+
 int nvme_mi_admin_ns_mgmt(nvme_mi_ctrl_t ctrl,
 			  struct nvme_ns_mgmt_args *args)
 {

src/nvme/mi.h

@@ -3149,6 +3149,18 @@ int nvme_mi_admin_get_features(nvme_mi_ctrl_t ctrl,
 int nvme_mi_admin_get_features_arbitration(nvme_mi_ctrl_t ctrl, enum nvme_get_features_sel sel,
 					   __u32 *result);
 
+/**
+ * nvme_mi_admin_get_features_power_mgmt() - Get power management feature
+ * @ctrl: Controller to send command to
+ * @sel: Select which type of attribute to return, see &enum nvme_get_features_sel
+ * @result: The feature data is returned in this argument
+ *
+ * Return: The nvme command status if a response was received (see
+ * &enum nvme_status_field) or -1 with errno set otherwise.
+ */
+int nvme_mi_admin_get_features_power_mgmt(nvme_mi_ctrl_t ctrl, enum nvme_get_features_sel sel,
+					  __u32 *result);
+
 /**
  * nvme_mi_admin_get_features_data() - Helper function for &nvme_mi_admin_get_features()
  * @ctrl: Controller to send command to
@@ -3220,6 +3232,20 @@ static inline int nvme_mi_admin_get_features_simple(nvme_mi_ctrl_t ctrl,
 int nvme_mi_admin_set_features(nvme_mi_ctrl_t ctrl,
 			       struct nvme_set_features_args *args);
 
+/**
+ * nvme_mi_admin_set_features_power_mgmt() - Set power management feature
+ * @ctrl: Controller to send command to
+ * @ps: Power State
+ * @wh: Workload Hint
+ * @save: Save value across power states
+ * @result: The feature data is returned in this argument
+ *
+ * Return: The nvme command status if a response was received (see
+ * &enum nvme_status_field) or -1 with errno set otherwise.
+ */
+int nvme_mi_admin_set_features_power_mgmt(nvme_mi_ctrl_t ctrl, __u8 ps, __u8 wh, bool save,
+					  __u32 *result);
+
 /**
  * nvme_mi_admin_ns_mgmt - Issue a Namespace Management command
  * @ctrl: Controller to send command to