qcacld-3.0: Log suspend failure reasons

Increment counters for the various reasons a suspend might fail, and
log them via print messages at time of failure.

Change-Id: Ie1fb700577aee5f1b3a0d29277b81299a13dbde3
CRs-Fixed: 1073824

core/hdd/inc/wlan_hdd_main.h

@@ -1235,8 +1235,25 @@ struct acs_dfs_policy {
 	uint8_t acs_channel;
 };
 
-/** Adapter structure definition */
+/**
+ * enum suspend_fail_reason: Reasons a WLAN suspend might fail
+ * SUSPEND_FAIL_IPA: IPA in progress
+ * SUSPEND_FAIL_RADAR: radar scan in progress
+ * SUSPEND_FAIL_ROAM: roaming in progress
+ * SUSPEND_FAIL_SCAN: scan in progress
+ * SUSPEND_FAIL_INITIAL_WAKEUP: received initial wakeup from firmware
+ * SUSPEND_FAIL_MAX_COUNT: the number of wakeup reasons, always at the end
+ */
+enum suspend_fail_reason {
+	SUSPEND_FAIL_IPA,
+	SUSPEND_FAIL_RADAR,
+	SUSPEND_FAIL_ROAM,
+	SUSPEND_FAIL_SCAN,
+	SUSPEND_FAIL_INITIAL_WAKEUP,
+	SUSPEND_FAIL_MAX_COUNT
+};
 
+/** Adapter structure definition */
 struct hdd_context_s {
 	/** Global CDS context  */
 	v_CONTEXT_t pcds_context;
@@ -1510,6 +1527,9 @@ struct hdd_context_s {
 	bool update_mac_addr_to_fw;
 	struct acs_dfs_policy acs_policy;
 	uint16_t wmi_max_len;
+
+	/* counters for failed suspend reasons */
+	uint32_t suspend_fail_stats[SUSPEND_FAIL_MAX_COUNT];
 };
 
 /*---------------------------------------------------------------------------

core/hdd/inc/wlan_hdd_power.h

@@ -199,6 +199,20 @@ static inline
 void hdd_wlan_suspend_resume_event(uint8_t state) {}
 #endif /* FEATURE_WLAN_DIAG_SUPPORT */
 
+/**
+ * wlan_hdd_inc_suspend_stats() - Prints, then increments, then prints suspend
+ *	failed statistics.
+ * @hdd_ctx:	The HDD context to operate on
+ * @reason:	The suspend failed reason to increment
+ *
+ * This function prints all of the suspend failed statistics, increments the
+ * specified suspend fail reason statistic, and prints the them all again. This
+ * is for easily keeping track of the most common reasons suspend fails.
+ *
+ * Return: none
+ */
+void wlan_hdd_inc_suspend_stats(hdd_context_t *hdd_ctx,
+				enum suspend_fail_reason reason);
 
 /*
  * Unit-test suspend/resume is a testing feature that allows putting firmware

core/hdd/src/wlan_hdd_driver_ops.c

@@ -618,10 +618,14 @@ resume_hif_noirq:
 	status = hif_bus_resume_noirq(hif_ctx);
 	QDF_BUG(!status);
 done:
-	if (err == -EAGAIN)
+	if (err == -EAGAIN) {
 		hdd_err("Firmware attempting wakeup, try again");
-	else
+		wlan_hdd_inc_suspend_stats(hdd_ctx,
+					   SUSPEND_FAIL_INITIAL_WAKEUP);
+	} else {
 		hdd_err("suspend_noirq failed, status = %d", err);
+	}
+
 	return err;
 }
 

core/hdd/src/wlan_hdd_power.c

@@ -1667,6 +1667,24 @@ static int wlan_hdd_set_powersave(hdd_adapter_t *adapter,
 	return 0;
 }
 
+static void wlan_hdd_print_suspend_fail_stats(hdd_context_t *hdd_ctx)
+{
+	hdd_err("ipa:%d, radar:%d, roam:%d, scan:%d, initial_wakeup:%d",
+		hdd_ctx->suspend_fail_stats[SUSPEND_FAIL_IPA],
+		hdd_ctx->suspend_fail_stats[SUSPEND_FAIL_RADAR],
+		hdd_ctx->suspend_fail_stats[SUSPEND_FAIL_ROAM],
+		hdd_ctx->suspend_fail_stats[SUSPEND_FAIL_SCAN],
+		hdd_ctx->suspend_fail_stats[SUSPEND_FAIL_INITIAL_WAKEUP]);
+}
+
+void wlan_hdd_inc_suspend_stats(hdd_context_t *hdd_ctx,
+				enum suspend_fail_reason reason)
+{
+	wlan_hdd_print_suspend_fail_stats(hdd_ctx);
+	hdd_ctx->suspend_fail_stats[reason]++;
+	wlan_hdd_print_suspend_fail_stats(hdd_ctx);
+}
+
 /**
  * __wlan_hdd_cfg80211_resume_wlan() - cfg80211 resume callback
  * @wiphy: Pointer to wiphy
@@ -1859,6 +1877,8 @@ static int __wlan_hdd_cfg80211_suspend_wlan(struct wiphy *wiphy,
 			    WLAN_HDD_GET_AP_CTX_PTR(pAdapter)->
 			    dfs_cac_block_tx) {
 				hdd_err("RADAR detection in progress, do not allow suspend");
+				wlan_hdd_inc_suspend_stats(pHddCtx,
+							   SUSPEND_FAIL_RADAR);
 				return -EAGAIN;
 			} else if (!pHddCtx->config->enableSapSuspend) {
 				/* return -EOPNOTSUPP if SAP does not support
@@ -1891,6 +1911,8 @@ static int __wlan_hdd_cfg80211_suspend_wlan(struct wiphy *wiphy,
 		if (sme_sta_in_middle_of_roaming
 			    (pHddCtx->hHal, pAdapter->sessionId)) {
 			hdd_err("Roaming in progress, do not allow suspend");
+			wlan_hdd_inc_suspend_stats(pHddCtx,
+						   SUSPEND_FAIL_ROAM);
 			return -EAGAIN;
 		}
 
@@ -1905,6 +1927,8 @@ static int __wlan_hdd_cfg80211_suspend_wlan(struct wiphy *wiphy,
 				    msecs_to_jiffies(WLAN_WAIT_TIME_ABORTSCAN));
 			if (!status) {
 				hdd_err("Timeout occurred while waiting for abort scan");
+				wlan_hdd_inc_suspend_stats(pHddCtx,
+							   SUSPEND_FAIL_SCAN);
 				return -ETIME;
 			}
 		}
@@ -1918,6 +1942,7 @@ static int __wlan_hdd_cfg80211_suspend_wlan(struct wiphy *wiphy,
 	 */
 	if (hdd_ipa_suspend(pHddCtx)) {
 		hdd_err("IPA not ready to suspend!");
+		wlan_hdd_inc_suspend_stats(pHddCtx, SUSPEND_FAIL_IPA);
 		return -EAGAIN;
 	}