[PATCH rtw-next 2/8] wifi: rtw89: debug: add beacon_info debugfs

[Ping-Ke Shih <pkshih@xxxxxxxxxxx>]

From: Kuan-Chung Chen <damon.chen@xxxxxxxxxxx>

Add debugfs beacon_info to display the information of beacon tracking.
The screenshot as below:

  [Beacon info]
  count: 15
  interval: 100
  dtim: 1
  raw rssi: 146
  hw rate: 0
  length: 407

  [Distribution]
  tbtt
  00 - 04: 26
  05 - 09: 5
  10 - 14: 1
  15 - 19: 0
  20 - 24: 0
  25 - 29: 0

  drift
  0: 9
  1: 7
  2: 3
  3: 3
  4: 4
  5: 1
  6: 1
  7: 2
  8: 1
  11: 1

  lower bound: 0
  upper bound: 10
  outlier count: 1

  [Tracking]
  tbtt offset: 20
  bcn timeout: 19

Signed-off-by: Kuan-Chung Chen <damon.chen@xxxxxxxxxxx>
Signed-off-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
---
 drivers/net/wireless/realtek/rtw89/debug.c | 61 ++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw89/debug.c b/drivers/net/wireless/realtek/rtw89/debug.c
index afdfb9647fc1..a37cdd73ddc3 100644
--- a/drivers/net/wireless/realtek/rtw89/debug.c
+++ b/drivers/net/wireless/realtek/rtw89/debug.c
@@ -86,6 +86,7 @@ struct rtw89_debugfs {
 	struct rtw89_debugfs_priv stations;
 	struct rtw89_debugfs_priv disable_dm;
 	struct rtw89_debugfs_priv mlo_mode;
+	struct rtw89_debugfs_priv beacon_info;
 };
 
 struct rtw89_debugfs_iter_data {
@@ -4298,6 +4299,64 @@ rtw89_debug_priv_mlo_mode_set(struct rtw89_dev *rtwdev,
 	return count;
 }
 
+static ssize_t
+rtw89_debug_priv_beacon_info_get(struct rtw89_dev *rtwdev,
+				 struct rtw89_debugfs_priv *debugfs_priv,
+				 char *buf, size_t bufsz)
+{
+	struct rtw89_pkt_stat *pkt_stat = &rtwdev->phystat.last_pkt_stat;
+	struct rtw89_beacon_track_info *bcn_track = &rtwdev->bcn_track;
+	struct rtw89_beacon_stat *bcn_stat = &rtwdev->phystat.bcn_stat;
+	struct rtw89_beacon_dist *bcn_dist = &bcn_stat->bcn_dist;
+	u16 upper, lower = bcn_stat->tbtt_tu_min;
+	char *p = buf, *end = buf + bufsz;
+	u16 *drift = bcn_stat->drift;
+	u8 bcn_num = bcn_stat->num;
+	u8 count;
+	u8 i;
+
+	p += scnprintf(p, end - p, "[Beacon info]\n");
+	p += scnprintf(p, end - p, "count: %u\n", pkt_stat->beacon_nr);
+	p += scnprintf(p, end - p, "interval: %u\n", bcn_track->beacon_int);
+	p += scnprintf(p, end - p, "dtim: %u\n", bcn_track->dtim);
+	p += scnprintf(p, end - p, "raw rssi: %lu\n",
+		       ewma_rssi_read(&rtwdev->phystat.bcn_rssi));
+	p += scnprintf(p, end - p, "hw rate: %u\n", pkt_stat->beacon_rate);
+	p += scnprintf(p, end - p, "length: %u\n", pkt_stat->beacon_len);
+
+	p += scnprintf(p, end - p, "\n[Distribution]\n");
+	p += scnprintf(p, end - p, "tbtt\n");
+	for (i = 0; i < RTW89_BCN_TRACK_MAX_BIN_NUM; i++) {
+		upper = lower + RTW89_BCN_TRACK_BIN_WIDTH - 1;
+		if (i == RTW89_BCN_TRACK_MAX_BIN_NUM - 1)
+			upper = max(upper, bcn_stat->tbtt_tu_max);
+
+		p += scnprintf(p, end - p, "%02u - %02u: %u\n",
+			       lower, upper, bcn_dist->bins[i]);
+
+		lower = upper + 1;
+	}
+
+	p += scnprintf(p, end - p, "\ndrift\n");
+
+	for (i = 0; i < bcn_num; i += count) {
+		count = 1;
+		while (i + count < bcn_num && drift[i] == drift[i + count])
+			count++;
+
+		p += scnprintf(p, end - p, "%u: %u\n", drift[i], count);
+	}
+	p += scnprintf(p, end - p, "\nlower bound: %u\n", bcn_dist->lower_bound);
+	p += scnprintf(p, end - p, "upper bound: %u\n", bcn_dist->upper_bound);
+	p += scnprintf(p, end - p, "outlier count: %u\n", bcn_dist->outlier_count);
+
+	p += scnprintf(p, end - p, "\n[Tracking]\n");
+	p += scnprintf(p, end - p, "tbtt offset: %u\n", bcn_track->tbtt_offset);
+	p += scnprintf(p, end - p, "bcn timeout: %u\n", bcn_track->bcn_timeout);
+
+	return p - buf;
+}
+
 #define rtw89_debug_priv_get(name, opts...)			\
 {								\
 	.cb_read = rtw89_debug_priv_ ##name## _get,		\
@@ -4356,6 +4415,7 @@ static const struct rtw89_debugfs rtw89_debugfs_templ = {
 	.stations = rtw89_debug_priv_get(stations, RLOCK),
 	.disable_dm = rtw89_debug_priv_set_and_get(disable_dm, RWLOCK),
 	.mlo_mode = rtw89_debug_priv_set_and_get(mlo_mode, RWLOCK),
+	.beacon_info = rtw89_debug_priv_get(beacon_info),
 };
 
 #define rtw89_debugfs_add(name, mode, fopname, parent)				\
@@ -4401,6 +4461,7 @@ void rtw89_debugfs_add_sec1(struct rtw89_dev *rtwdev, struct dentry *debugfs_top
 	rtw89_debugfs_add_r(stations);
 	rtw89_debugfs_add_rw(disable_dm);
 	rtw89_debugfs_add_rw(mlo_mode);
+	rtw89_debugfs_add_r(beacon_info);
 }
 
 void rtw89_debugfs_init(struct rtw89_dev *rtwdev)
-- 
2.25.1