rtw89: mac: correct decision on error status by scenario

The raw error code might combine error scenario and error status.
But, the error scenario isn't parsed previously. It makes us mishandle
cpu exception and assertion. Now, we correct the error status for them.

Besides, a few uses of error status are refined.
Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220314071250.40292-4-pkshih@realtek.com

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

@@ -257,7 +257,9 @@ static void rtw89_mac_dump_err_status(struct rtw89_dev *rtwdev,
 	u32 dmac_err, cmac_err;
 
 	if (err != MAC_AX_ERR_L1_ERR_DMAC &&
-	    err != MAC_AX_ERR_L0_PROMOTE_TO_L1)
+	    err != MAC_AX_ERR_L0_PROMOTE_TO_L1 &&
+	    err != MAC_AX_ERR_L0_ERR_CMAC0 &&
+	    err != MAC_AX_ERR_L0_ERR_CMAC1)
 		return;
 
 	rtw89_info(rtwdev, "--->\nerr=0x%x\n", err);
@@ -458,7 +460,7 @@ static void rtw89_mac_dump_err_status(struct rtw89_dev *rtwdev,
 
 u32 rtw89_mac_get_err_status(struct rtw89_dev *rtwdev)
 {
-	u32 err;
+	u32 err, err_scnr;
 	int ret;
 
 	ret = read_poll_timeout(rtw89_read32, err, (err != 0), 1000, 100000,
@@ -471,6 +473,12 @@ u32 rtw89_mac_get_err_status(struct rtw89_dev *rtwdev)
 	err = rtw89_read32(rtwdev, R_AX_HALT_C2H);
 	rtw89_write32(rtwdev, R_AX_HALT_C2H_CTRL, 0);
 
+	err_scnr = RTW89_ERROR_SCENARIO(err);
+	if (err_scnr == RTW89_WCPU_CPU_EXCEPTION)
+		err = MAC_AX_ERR_CPU_EXCEPTION;
+	else if (err_scnr == RTW89_WCPU_ASSERTION)
+		err = MAC_AX_ERR_ASSERTION;
+
 	rtw89_fw_st_dbg_dump(rtwdev);
 	rtw89_mac_dump_err_status(rtwdev, err);
 

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

@@ -521,6 +521,13 @@ struct rtw89_mac_dle_dfi_qempty {
 	u32 qempty;
 };
 
+enum rtw89_mac_error_scenario {
+	RTW89_WCPU_CPU_EXCEPTION	= 2,
+	RTW89_WCPU_ASSERTION		= 3,
+};
+
+#define RTW89_ERROR_SCENARIO(__err) ((__err) >> 28)
+
 /* Define DBG and recovery enum */
 enum mac_ax_err_info {
 	/* Get error info */
@@ -659,6 +666,7 @@ enum mac_ax_err_info {
 	MAC_AX_ERR_L2_ERR_APB_BBRF_TO_OTHERS = 0x2370,
 	MAC_AX_ERR_L2_RESET_DONE = 0x2400,
 	MAC_AX_ERR_CPU_EXCEPTION = 0x3000,
+	MAC_AX_ERR_ASSERTION = 0x4000,
 	MAC_AX_GET_ERR_MAX,
 	MAC_AX_DUMP_SHAREBUFF_INDICATOR = 0x80000000,
 

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

@@ -477,7 +477,7 @@ int rtw89_ser_notify(struct rtw89_dev *rtwdev, u32 err)
 {
 	u8 event = SER_EV_NONE;
 
-	rtw89_info(rtwdev, "ser event = 0x%04x\n", err);
+	rtw89_info(rtwdev, "SER catches error: 0x%x\n", err);
 
 	switch (err) {
 	case MAC_AX_ERR_L1_ERR_DMAC:
@@ -503,8 +503,10 @@ int rtw89_ser_notify(struct rtw89_dev *rtwdev, u32 err)
 		break;
 	}
 
-	if (event == SER_EV_NONE)
+	if (event == SER_EV_NONE) {
+		rtw89_warn(rtwdev, "SER cannot recognize error: 0x%x\n", err);
 		return -EINVAL;
+	}
 
 	ser_send_msg(&rtwdev->ser, event);
 	return 0;