qcacld-3.0: Dump wmi/event record after FW down

On third party platforms. there is no crashdump.
Such logs are helpful for analysis of crash issue.
For debuging purpose, dump wmi cmd/event/credit
record history when PLD_FW_DOWN event is received.

CONFIG_DUMP_LOG_BUF_CNT is used to limit the number
of logs. it's 0 by default on the platforms like LA
where crashdump is available.

Change-Id: I136e39322b32ff43b88765f390a7393432ca7daa
CRs-Fixed: 2857691

Kbuild

@@ -3517,6 +3517,10 @@ ifdef CONFIG_MAX_LOGS_PER_SEC
 ccflags-y += -DWLAN_MAX_LOGS_PER_SEC=$(CONFIG_MAX_LOGS_PER_SEC)
 endif
 
+ifeq ($(CONFIG_NON_QC_PLATFORM), y)
+ccflags-y += -DWLAN_DUMP_LOG_BUF_CNT=$(CONFIG_DUMP_LOG_BUF_CNT)
+endif
+
 ifdef CONFIG_SCHED_HISTORY_SIZE
 ccflags-y += -DWLAN_SCHED_HISTORY_SIZE=$(CONFIG_SCHED_HISTORY_SIZE)
 endif

core/hdd/inc/wlan_hdd_wext.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012-2020 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2021 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -343,6 +343,20 @@ void hdd_wext_send_event(struct net_device *dev, unsigned int cmd,
 }
 #endif /* WLAN_WEXT_SUPPORT_ENABLE */
 
+#ifdef WLAN_DUMP_LOG_BUF_CNT
+/**
+ * hdd_dump_log_buffer() - dump log buffer history
+ *
+ * Reture: None
+ */
+void hdd_dump_log_buffer(void);
+#else
+static inline
+void hdd_dump_log_buffer(void)
+{
+}
+#endif
+
 #if defined(WLAN_WEXT_SUPPORT_ENABLE) && defined(HASTINGS_BT_WAR)
 int hdd_hastings_bt_war_enable_fw(struct hdd_context *hdd_ctx);
 int hdd_hastings_bt_war_disable_fw(struct hdd_context *hdd_ctx);

core/hdd/src/wlan_hdd_driver_ops.c

@@ -1947,7 +1947,7 @@ wlan_hdd_pld_uevent(struct device *dev, struct pld_uevent_data *event_data)
 	switch (event_data->uevent) {
 	case PLD_FW_DOWN:
 		hdd_debug("Received firmware down indication");
-
+		hdd_dump_log_buffer();
 		cds_set_target_ready(false);
 		cds_set_recovery_in_progress(true);
 

core/hdd/src/wlan_hdd_wext.c

@@ -8833,6 +8833,16 @@ static void hdd_ioctl_log_buffer(int log_id, uint32_t count)
 	}
 }
 
+#ifdef WLAN_DUMP_LOG_BUF_CNT
+void hdd_dump_log_buffer(void)
+{
+	int i;
+
+	for (i = 0; i <= MGMT_EVENT_LOG; i++)
+		hdd_ioctl_log_buffer(i, WLAN_DUMP_LOG_BUF_CNT);
+}
+#endif
+
 #ifdef CONFIG_DP_TRACE
 void hdd_set_dump_dp_trace(uint16_t cmd_type, uint16_t count)
 {