mt76: mt7915: add debugfs knobs for MCU utilization

Add debugfs knobs to read MCU utilization, which helps user know
firmware status more easily to narrow down CPU bottleneck issues.
Co-developed-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c

@@ -106,6 +106,12 @@ mt7915_fw_debug_wm_set(void *data, u64 val)
 			return ret;
 	}
 
+	/* WM CPU info record control */
+	mt76_clear(dev, MT_CPU_UTIL_CTRL, BIT(0));
+	mt76_wr(dev, MT_DIC_CMD_REG_CMD, BIT(2) | BIT(13) | !dev->fw_debug_wm);
+	mt76_wr(dev, MT_MCU_WM_CIRQ_IRQ_MASK_CLR_ADDR, BIT(5));
+	mt76_wr(dev, MT_MCU_WM_CIRQ_IRQ_SOFT_ADDR, BIT(5));
+
 	return 0;
 }
 
@@ -126,10 +132,16 @@ static int
 mt7915_fw_debug_wa_set(void *data, u64 val)
 {
 	struct mt7915_dev *dev = data;
+	int ret;
 
 	dev->fw_debug_wa = val ? MCU_FW_LOG_TO_HOST : 0;
 
-	return mt7915_mcu_fw_log_2_host(dev, MCU_FW_LOG_WA, dev->fw_debug_wa);
+	ret = mt7915_mcu_fw_log_2_host(dev, MCU_FW_LOG_WA, dev->fw_debug_wa);
+	if (ret)
+		return ret;
+
+	return mt7915_mcu_wa_cmd(dev, MCU_WA_PARAM_CMD(SET), MCU_WA_PARAM_PDMA_RX,
+				 !!dev->fw_debug_wa, 0);
 }
 
 static int
@@ -145,6 +157,39 @@ mt7915_fw_debug_wa_get(void *data, u64 *val)
 DEFINE_DEBUGFS_ATTRIBUTE(fops_fw_debug_wa, mt7915_fw_debug_wa_get,
 			 mt7915_fw_debug_wa_set, "%lld\n");
 
+static int
+mt7915_fw_util_wm_show(struct seq_file *file, void *data)
+{
+	struct mt7915_dev *dev = file->private;
+
+	if (dev->fw_debug_wm) {
+		seq_printf(file, "Busy: %u%%  Peak busy: %u%%\n",
+			   mt76_rr(dev, MT_CPU_UTIL_BUSY_PCT),
+			   mt76_rr(dev, MT_CPU_UTIL_PEAK_BUSY_PCT));
+		seq_printf(file, "Idle count: %u  Peak idle count: %u\n",
+			   mt76_rr(dev, MT_CPU_UTIL_IDLE_CNT),
+			   mt76_rr(dev, MT_CPU_UTIL_PEAK_IDLE_CNT));
+	}
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mt7915_fw_util_wm);
+
+static int
+mt7915_fw_util_wa_show(struct seq_file *file, void *data)
+{
+	struct mt7915_dev *dev = file->private;
+
+	if (dev->fw_debug_wa)
+		return mt7915_mcu_wa_cmd(dev, MCU_WA_PARAM_CMD(QUERY),
+					 MCU_WA_PARAM_CPU_UTIL, 0, 0);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mt7915_fw_util_wa);
+
 static void
 mt7915_ampdu_stat_read_phy(struct mt7915_phy *phy,
 			   struct seq_file *file)
@@ -491,6 +536,10 @@ int mt7915_init_debugfs(struct mt7915_phy *phy)
 	debugfs_create_file("tx_stats", 0400, dir, phy, &mt7915_tx_stats_fops);
 	debugfs_create_file("fw_debug_wm", 0600, dir, dev, &fops_fw_debug_wm);
 	debugfs_create_file("fw_debug_wa", 0600, dir, dev, &fops_fw_debug_wa);
+	debugfs_create_file("fw_util_wm", 0400, dir, dev,
+			    &mt7915_fw_util_wm_fops);
+	debugfs_create_file("fw_util_wa", 0400, dir, dev,
+			    &mt7915_fw_util_wa_fops);
 	debugfs_create_file("implicit_txbf", 0600, dir, dev,
 			    &fops_implicit_txbf);
 	debugfs_create_file("txpower_sku", 0400, dir, phy,

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -416,8 +416,7 @@ mt7915_mcu_send_message(struct mt76_dev *mdev, struct sk_buff *skb,
 	return mt76_tx_queue_skb_raw(dev, mdev->q_mcu[qid], skb, 0);
 }
 
-static int
-mt7915_mcu_wa_cmd(struct mt7915_dev *dev, int cmd, u32 a1, u32 a2, u32 a3)
+int mt7915_mcu_wa_cmd(struct mt7915_dev *dev, int cmd, u32 a1, u32 a2, u32 a3)
 {
 	struct {
 		__le32 args[3];
@@ -429,7 +428,7 @@ mt7915_mcu_wa_cmd(struct mt7915_dev *dev, int cmd, u32 a1, u32 a2, u32 a3)
 		},
 	};
 
-	return mt76_mcu_send_msg(&dev->mt76, cmd, &req, sizeof(req), true);
+	return mt76_mcu_send_msg(&dev->mt76, cmd, &req, sizeof(req), false);
 }
 
 static void

drivers/net/wireless/mediatek/mt76/mt7915/mcu.h

@@ -309,6 +309,8 @@ enum {
 };
 
 enum {
+	MCU_WA_PARAM_PDMA_RX = 0x04,
+	MCU_WA_PARAM_CPU_UTIL = 0x0b,
 	MCU_WA_PARAM_RED = 0x0e,
 };
 

drivers/net/wireless/mediatek/mt76/mt7915/mmio.c

@@ -34,6 +34,9 @@ static u32 __mt7915_reg_addr(struct mt7915_dev *dev, u32 addr)
 		u32 mapped;
 		u32 size;
 	} fixed_map[] = {
+		{ 0x00400000, 0x80000, 0x10000 }, /* WF_MCU_SYSRAM */
+		{ 0x00410000, 0x90000, 0x10000 }, /* WF_MCU_SYSRAM (configure regs) */
+		{ 0x40000000, 0x70000, 0x10000 }, /* WF_UMAC_SYSRAM */
 		{ 0x54000000, 0x02000, 0x1000 }, /* WFDMA PCIE0 MCU DMA0 */
 		{ 0x55000000, 0x03000, 0x1000 }, /* WFDMA PCIE0 MCU DMA1 */
 		{ 0x58000000, 0x06000, 0x1000 }, /* WFDMA PCIE1 MCU DMA0 (MEM_DMA) */

drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h

@@ -450,6 +450,7 @@ int mt7915_mcu_get_rx_rate(struct mt7915_phy *phy, struct ieee80211_vif *vif,
 			   struct ieee80211_sta *sta, struct rate_info *rate);
 int mt7915_mcu_rdd_cmd(struct mt7915_dev *dev, enum mt7915_rdd_cmd cmd,
 		       u8 index, u8 rx_sel, u8 val);
+int mt7915_mcu_wa_cmd(struct mt7915_dev *dev, int cmd, u32 a1, u32 a2, u32 a3);
 int mt7915_mcu_fw_log_2_host(struct mt7915_dev *dev, u8 type, u8 ctrl);
 int mt7915_mcu_fw_dbg_ctrl(struct mt7915_dev *dev, u32 module, u8 level);
 void mt7915_mcu_rx_event(struct mt7915_dev *dev, struct sk_buff *skb);

drivers/net/wireless/mediatek/mt76/mt7915/regs.h

@@ -528,6 +528,18 @@
 #define MT_HIF_REMAP_L2_BASE		GENMASK(31, 12)
 #define MT_HIF_REMAP_BASE_L2		0x00000
 
+#define MT_DIC_CMD_REG_BASE		0x41f000
+#define MT_DIC_CMD_REG(ofs)		(MT_DIC_CMD_REG_BASE + (ofs))
+#define MT_DIC_CMD_REG_CMD		MT_DIC_CMD_REG(0x10)
+
+#define MT_CPU_UTIL_BASE		0x41f030
+#define MT_CPU_UTIL(ofs)		(MT_CPU_UTIL_BASE + (ofs))
+#define MT_CPU_UTIL_BUSY_PCT		MT_CPU_UTIL(0x00)
+#define MT_CPU_UTIL_PEAK_BUSY_PCT	MT_CPU_UTIL(0x04)
+#define MT_CPU_UTIL_IDLE_CNT		MT_CPU_UTIL(0x08)
+#define MT_CPU_UTIL_PEAK_IDLE_CNT	MT_CPU_UTIL(0x0c)
+#define MT_CPU_UTIL_CTRL		MT_CPU_UTIL(0x1c)
+
 #define MT_SWDEF_BASE			0x41f200
 #define MT_SWDEF(ofs)			(MT_SWDEF_BASE + (ofs))
 #define MT_SWDEF_MODE			MT_SWDEF(0x3c)
@@ -590,4 +602,9 @@
 #define MT_WF_PHY_RXTD12_IRPI_SW_CLR_ONLY	BIT(18)
 #define MT_WF_PHY_RXTD12_IRPI_SW_CLR	BIT(29)
 
+#define MT_MCU_WM_CIRQ_BASE			0x89010000
+#define MT_MCU_WM_CIRQ(ofs)			(MT_MCU_WM_CIRQ_BASE + (ofs))
+#define MT_MCU_WM_CIRQ_IRQ_MASK_CLR_ADDR	MT_MCU_WM_CIRQ(0x80)
+#define MT_MCU_WM_CIRQ_IRQ_SOFT_ADDR		MT_MCU_WM_CIRQ(0xc0)
+
 #endif