wifi: rtw89: debug: add mlo_mode dbgfs

Add an dbgfs mlo_mode to get/set MLO mode. And, support to trigger MLSR
switching. Setting it will automatically disable MLO Dynamic Mechanism
(DM). Then MLO things can follow commands via dbgfs mlo_mode instead of
MLO DM. The disabled DM(s) can be checked/cleared via dbgfs disable_dm.

The following is an use example.

Read it to show current MLD status.
	$ cat mlo_mode

	MLD(s) status: (MLO DM: enable)
		#0: MLO mode 0, valid 0x6, active 0x2

Write it to switch to MLSR on link id 2.
	$ echo 0 2 > mlo_mode
	$ cat mlo_mode

	MLD(s) status: (MLO DM: disable)
		#0: MLO mode 0, valid 0x6, active 0x4

Besides, to be safer, add RWLOCK attribute to dbgfs disable_dm.

Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250505072440.45113-11-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/core.c

@@ -3708,9 +3708,13 @@ select:
 
 static void rtw89_core_mlo_track(struct rtw89_dev *rtwdev)
 {
+	struct rtw89_hal *hal = &rtwdev->hal;
 	struct ieee80211_vif *vif;
 	struct rtw89_vif *rtwvif;
 
+	if (hal->disabled_dm_bitmap & BIT(RTW89_DM_MLO))
+		return;
+
 	rtw89_for_each_rtwvif(rtwdev, rtwvif) {
 		vif = rtwvif_to_vif(rtwvif);
 		if (!vif->cfg.assoc || !ieee80211_vif_is_mld(vif))

drivers/net/wireless/realtek/rtw89/core.h

@@ -4842,6 +4842,7 @@ enum rtw89_dm_type {
 	RTW89_DM_DYNAMIC_EDCCA,
 	RTW89_DM_THERMAL_PROTECT,
 	RTW89_DM_TAS,
+	RTW89_DM_MLO,
 };
 
 #define RTW89_THERMAL_PROT_LV_MAX 5

drivers/net/wireless/realtek/rtw89/debug.c

@@ -85,6 +85,7 @@ struct rtw89_debugfs {
 	struct rtw89_debugfs_priv phy_info;
 	struct rtw89_debugfs_priv stations;
 	struct rtw89_debugfs_priv disable_dm;
+	struct rtw89_debugfs_priv mlo_mode;
 };
 
 struct rtw89_debugfs_iter_data {
@@ -4136,6 +4137,35 @@ static ssize_t rtw89_debug_priv_stations_get(struct rtw89_dev *rtwdev,
 	return p - buf;
 }
 
+static void rtw89_debug_disable_dm_cfg_bmap(struct rtw89_dev *rtwdev, u32 new)
+{
+	struct rtw89_hal *hal = &rtwdev->hal;
+	u32 old = hal->disabled_dm_bitmap;
+
+	if (new == old)
+		return;
+
+	hal->disabled_dm_bitmap = new;
+
+	rtw89_debug(rtwdev, RTW89_DBG_STATE, "Disable DM: 0x%x -> 0x%x\n", old, new);
+}
+
+static void rtw89_debug_disable_dm_set_flag(struct rtw89_dev *rtwdev, u8 flag)
+{
+	struct rtw89_hal *hal = &rtwdev->hal;
+	u32 cur = hal->disabled_dm_bitmap;
+
+	rtw89_debug_disable_dm_cfg_bmap(rtwdev, cur | BIT(flag));
+}
+
+static void rtw89_debug_disable_dm_clr_flag(struct rtw89_dev *rtwdev, u8 flag)
+{
+	struct rtw89_hal *hal = &rtwdev->hal;
+	u32 cur = hal->disabled_dm_bitmap;
+
+	rtw89_debug_disable_dm_cfg_bmap(rtwdev, cur & ~BIT(flag));
+}
+
 #define DM_INFO(type) {RTW89_DM_ ## type, #type}
 
 static const struct rtw89_disabled_dm_info {
@@ -4145,6 +4175,7 @@ static const struct rtw89_disabled_dm_info {
 	DM_INFO(DYNAMIC_EDCCA),
 	DM_INFO(THERMAL_PROTECT),
 	DM_INFO(TAS),
+	DM_INFO(MLO),
 };
 
 static ssize_t
@@ -4178,7 +4209,6 @@ rtw89_debug_priv_disable_dm_set(struct rtw89_dev *rtwdev,
 				struct rtw89_debugfs_priv *debugfs_priv,
 				const char *buf, size_t count)
 {
-	struct rtw89_hal *hal = &rtwdev->hal;
 	u32 conf;
 	int ret;
 
@@ -4186,7 +4216,83 @@ rtw89_debug_priv_disable_dm_set(struct rtw89_dev *rtwdev,
 	if (ret)
 		return -EINVAL;
 
-	hal->disabled_dm_bitmap = conf;
+	rtw89_debug_disable_dm_cfg_bmap(rtwdev, conf);
+
+	return count;
+}
+
+static void rtw89_debug_mlo_mode_set_mlsr(struct rtw89_dev *rtwdev,
+					  unsigned int link_id)
+{
+	struct ieee80211_vif *vif;
+	struct rtw89_vif *rtwvif;
+
+	rtw89_for_each_rtwvif(rtwdev, rtwvif) {
+		vif = rtwvif_to_vif(rtwvif);
+		if (!ieee80211_vif_is_mld(vif))
+			continue;
+
+		rtw89_core_mlsr_switch(rtwdev, rtwvif, link_id);
+	}
+}
+
+static ssize_t
+rtw89_debug_priv_mlo_mode_get(struct rtw89_dev *rtwdev,
+			      struct rtw89_debugfs_priv *debugfs_priv,
+			      char *buf, size_t bufsz)
+{
+	bool mlo_dm_dis = rtwdev->hal.disabled_dm_bitmap & BIT(RTW89_DM_MLO);
+	char *p = buf, *end = buf + bufsz;
+	struct ieee80211_vif *vif;
+	struct rtw89_vif *rtwvif;
+	int count = 0;
+
+	p += scnprintf(p, end - p, "MLD(s) status: (MLO DM: %s)\n",
+		       str_disable_enable(mlo_dm_dis));
+
+	rtw89_for_each_rtwvif(rtwdev, rtwvif) {
+		vif = rtwvif_to_vif(rtwvif);
+		if (!ieee80211_vif_is_mld(vif))
+			continue;
+
+		p += scnprintf(p, end - p,
+			       "\t#%u: MLO mode %x, valid 0x%x, active 0x%x\n",
+			       count++, rtwvif->mlo_mode, vif->valid_links,
+			       vif->active_links);
+	}
+
+	if (count == 0)
+		p += scnprintf(p, end - p, "\t(None)\n");
+
+	return p - buf;
+}
+
+static ssize_t
+rtw89_debug_priv_mlo_mode_set(struct rtw89_dev *rtwdev,
+			      struct rtw89_debugfs_priv *debugfs_priv,
+			      const char *buf, size_t count)
+{
+	u8 num, mlo_mode;
+	u32 argv;
+
+	num = sscanf(buf, "%hhx %u", &mlo_mode, &argv);
+	if (num != 2)
+		return -EINVAL;
+
+	rtw89_debug_disable_dm_set_flag(rtwdev, RTW89_DM_MLO);
+
+	rtw89_debug(rtwdev, RTW89_DBG_STATE, "Set MLO mode to %x\n", mlo_mode);
+
+	switch (mlo_mode) {
+	case RTW89_MLO_MODE_MLSR:
+		rtw89_debug_mlo_mode_set_mlsr(rtwdev, argv);
+		break;
+	default:
+		rtw89_debug(rtwdev, RTW89_DBG_STATE, "Unsupported MLO mode\n");
+		rtw89_debug_disable_dm_clr_flag(rtwdev, RTW89_DM_MLO);
+
+		return -EOPNOTSUPP;
+	}
 
 	return count;
 }
@@ -4247,7 +4353,8 @@ static const struct rtw89_debugfs rtw89_debugfs_templ = {
 	.fw_log_manual = rtw89_debug_priv_set(fw_log_manual, WLOCK),
 	.phy_info = rtw89_debug_priv_get(phy_info),
 	.stations = rtw89_debug_priv_get(stations, RLOCK),
-	.disable_dm = rtw89_debug_priv_set_and_get(disable_dm),
+	.disable_dm = rtw89_debug_priv_set_and_get(disable_dm, RWLOCK),
+	.mlo_mode = rtw89_debug_priv_set_and_get(mlo_mode, RWLOCK),
 };
 
 #define rtw89_debugfs_add(name, mode, fopname, parent)				\
@@ -4292,6 +4399,7 @@ void rtw89_debugfs_add_sec1(struct rtw89_dev *rtwdev, struct dentry *debugfs_top
 	rtw89_debugfs_add_r(phy_info);
 	rtw89_debugfs_add_r(stations);
 	rtw89_debugfs_add_rw(disable_dm);
+	rtw89_debugfs_add_rw(mlo_mode);
 }
 
 void rtw89_debugfs_init(struct rtw89_dev *rtwdev)