wifi: ath11k: Add support to get power save duration for each client

Add support to get the following power save information through debugfs interface,

 * Current ps state of the peer
 * Time duration since the peer is in power save
 * Total duration of the peer spent in power save

Above information is helpful in debugging the issues with power save clients.

This patch also add trace log support for PS timekeeper to track the PS state
change of the peers alongs with the peer MAC address and timestamp.

Use the below commands to get the above power save information,

To know the time_since_station_in_power_save:
cat /sys/kernel/debug/ieee80211/phyX/netdev:wlanX/stations/
XX:XX:XX:XX:XX:XX/current_ps_duration

To know power_save_duration:
cat /sys/kernel/debug/ieee80211/phyX/netdev:wlanX/stations/
XX:XX:XX:XX:XX:XX/total_ps_duration

To reset the power_save_duration of all stations connected to AP:
echo 1 > /sys/kernel/debug/ieee80211/phyX/ath11k/reset_ps_duration

To enable/disable the ps_timekeeper:
echo Y > /sys/kernel/debug/ieee80211/phyX/ath11k/ps_timekeeper_enable
Y = 1 to enable and Y = 0 to disable.

To record PS timekeeer logs after enabling ps_timekeeper:
trace-cmd record -e ath11k_ps_timekeeper

Tested-on: Tested-on: IPQ8074 WLAN.HK.2.5.0.1-00991-QCAHKSWPL_SILICONZ-1

Signed-off-by: Venkateswara Naralasetty <quic_vnaralas@quicinc.com>
Signed-off-by: Tamizh Chelvam Raja <quic_tamizhr@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220725054601.14719-1-quic_tamizhr@quicinc.com

1 files changed, 107 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath11k/debugfs_sta.c b/drivers/net/wireless/ath/ath11k/debugfs_sta.c
index 1b1acbdf837a..9cc4ef28e751 100644
--- a/drivers/net/wireless/ath/ath11k/debugfs_sta.c
+++ b/drivers/net/wireless/ath/ath11k/debugfs_sta.c
@@ -751,6 +751,102 @@ static const struct file_operations fops_htt_peer_stats_reset = {
 	.llseek = default_llseek,
 };
 
+static ssize_t ath11k_dbg_sta_read_peer_ps_state(struct file *file,
+						 char __user *user_buf,
+						 size_t count, loff_t *ppos)
+{
+	struct ieee80211_sta *sta = file->private_data;
+	struct ath11k_sta *arsta = (struct ath11k_sta *)sta->drv_priv;
+	struct ath11k *ar = arsta->arvif->ar;
+	char buf[20];
+	int len;
+
+	spin_lock_bh(&ar->data_lock);
+
+	len = scnprintf(buf, sizeof(buf), "%d\n", arsta->peer_ps_state);
+
+	spin_unlock_bh(&ar->data_lock);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static const struct file_operations fops_peer_ps_state = {
+	.open = simple_open,
+	.read = ath11k_dbg_sta_read_peer_ps_state,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
+static ssize_t ath11k_dbg_sta_read_current_ps_duration(struct file *file,
+						       char __user *user_buf,
+						       size_t count,
+						       loff_t *ppos)
+{
+	struct ieee80211_sta *sta = file->private_data;
+	struct ath11k_sta *arsta = (struct ath11k_sta *)sta->drv_priv;
+	struct ath11k *ar = arsta->arvif->ar;
+	u64 time_since_station_in_power_save;
+	char buf[20];
+	int len;
+
+	spin_lock_bh(&ar->data_lock);
+
+	if (arsta->peer_ps_state == WMI_PEER_PS_STATE_ON &&
+	    arsta->peer_current_ps_valid)
+		time_since_station_in_power_save = jiffies_to_msecs(jiffies
+						- arsta->ps_start_jiffies);
+	else
+		time_since_station_in_power_save = 0;
+
+	len = scnprintf(buf, sizeof(buf), "%llu\n",
+			time_since_station_in_power_save);
+	spin_unlock_bh(&ar->data_lock);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static const struct file_operations fops_current_ps_duration = {
+	.open = simple_open,
+	.read = ath11k_dbg_sta_read_current_ps_duration,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
+static ssize_t ath11k_dbg_sta_read_total_ps_duration(struct file *file,
+						     char __user *user_buf,
+						     size_t count, loff_t *ppos)
+{
+	struct ieee80211_sta *sta = file->private_data;
+	struct ath11k_sta *arsta = (struct ath11k_sta *)sta->drv_priv;
+	struct ath11k *ar = arsta->arvif->ar;
+	char buf[20];
+	u64 power_save_duration;
+	int len;
+
+	spin_lock_bh(&ar->data_lock);
+
+	if (arsta->peer_ps_state == WMI_PEER_PS_STATE_ON &&
+	    arsta->peer_current_ps_valid)
+		power_save_duration = jiffies_to_msecs(jiffies
+						- arsta->ps_start_jiffies)
+						+ arsta->ps_total_duration;
+	else
+		power_save_duration = arsta->ps_total_duration;
+
+	len = scnprintf(buf, sizeof(buf), "%llu\n", power_save_duration);
+
+	spin_unlock_bh(&ar->data_lock);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static const struct file_operations fops_total_ps_duration = {
+	.open = simple_open,
+	.read = ath11k_dbg_sta_read_total_ps_duration,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
 void ath11k_debugfs_sta_op_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 			       struct ieee80211_sta *sta, struct dentry *dir)
 {
@@ -778,4 +874,15 @@ void ath11k_debugfs_sta_op_add(struct ieee80211_hw *hw, struct ieee80211_vif *vi
 		     ar->ab->wmi_ab.svc_map))
 		debugfs_create_file("htt_peer_stats_reset", 0600, dir, sta,
 				    &fops_htt_peer_stats_reset);
+
+	debugfs_create_file("peer_ps_state", 0400, dir, sta,
+			    &fops_peer_ps_state);
+
+	if (test_bit(WMI_TLV_SERVICE_PEER_POWER_SAVE_DURATION_SUPPORT,
+		     ar->ab->wmi_ab.svc_map)) {
+		debugfs_create_file("current_ps_duration", 0440, dir, sta,
+				    &fops_current_ps_duration);
+		debugfs_create_file("total_ps_duration", 0440, dir, sta,
+				    &fops_total_ps_duration);
+	}
 }