qcacmn: Add APIs to set/get ce service max yield time

Add APIs to set/get ce service max yield time and update
max time taken in NAPI poll from the driver load time.

Change-Id: Idfd4a271ce13916f188c92ab3af32e1648f48c95
CRs-Fixed: 2055082

hif/inc/hif.h

@@ -171,6 +171,7 @@ struct qca_napi_stat {
 	uint32_t napi_budget_uses[QCA_NAPI_NUM_BUCKETS];
 	uint32_t time_limit_reached;
 	uint32_t rxpkt_thresh_reached;
+	unsigned long long napi_max_poll_time;
 };
 
 
@@ -920,4 +921,28 @@ ssize_t hif_ce_en_desc_hist(struct hif_softc *scn,
 ssize_t hif_disp_ce_enable_desc_data_hist(struct hif_softc *scn, char *buf);
 ssize_t hif_dump_desc_event(struct hif_softc *scn, char *buf);
 #endif /* Note: for MCL, #if defined(HIF_CONFIG_SLUB_DEBUG_ON) || HIF_CE_DEBUG_DATA_BUF */
+
+/**
+ * hif_set_ce_service_max_yield_time() - sets CE service max yield time
+ * @hif: hif context
+ * @ce_service_max_yield_time: CE service max yield time to set
+ *
+ * This API storess CE service max yield time in hif context based
+ * on ini value.
+ *
+ * Return: void
+ */
+void hif_set_ce_service_max_yield_time(struct hif_opaque_softc *hif,
+				       uint8_t ce_service_max_yield_time);
+
+/**
+ * hif_get_ce_service_max_yield_time() - get CE service max yield time
+ * @hif: hif context
+ *
+ * This API returns CE service max yield time.
+ *
+ * Return: CE service max yield time
+ */
+unsigned long long
+hif_get_ce_service_max_yield_time(struct hif_opaque_softc *hif);
 #endif /* _HIF_H_ */

hif/src/ce/ce_internal.h

@@ -141,6 +141,8 @@ struct CE_state {
 
 	/* time in nanoseconds to yield control of napi poll */
 	unsigned long long ce_service_yield_time;
+	/* CE service start time in nanoseconds */
+	unsigned long long ce_service_start_time;
 	/* Num Of Receive Buffers handled for one interrupt DPC routine */
 	unsigned int receive_count;
 	/* epping */

hif/src/ce/ce_service.c

@@ -1992,6 +1992,10 @@ more_data:
 		more_comp_cnt = 0;
 		goto more_data;
 	}
+
+	hif_update_napi_max_poll_time(ce_state, scn->napi_data.napis[ce_id],
+				      qdf_get_cpu());
+
 	qdf_atomic_set(&ce_state->rx_pending, 0);
 	if (TARGET_REGISTER_ACCESS_ALLOWED(scn)) {
 		CE_ENGINE_INT_STATUS_CLEAR(scn, ctrl_addr,
@@ -2025,11 +2029,6 @@ static void ce_per_engine_service_fast(struct hif_softc *scn, int ce_id)
 }
 #endif /* WLAN_FEATURE_FASTPATH */
 
-/* Maximum amount of time in nano seconds before which the CE per engine service
- * should yield. ~1 jiffie.
- */
-#define CE_PER_ENGINE_SERVICE_MAX_YIELD_TIME_NS (10 * 1000 * 1000)
-
 /*
  * Guts of interrupt handler for per-engine interrupts on a particular CE.
  *
@@ -2066,10 +2065,11 @@ int ce_per_engine_service(struct hif_softc *scn, unsigned int CE_id)
 	/* Clear force_break flag and re-initialize receive_count to 0 */
 	CE_state->receive_count = 0;
 	CE_state->force_break = 0;
+	CE_state->ce_service_start_time = sched_clock();
 	CE_state->ce_service_yield_time =
-		sched_clock() +
-		(unsigned long long)CE_PER_ENGINE_SERVICE_MAX_YIELD_TIME_NS;
-
+		CE_state->ce_service_start_time +
+		hif_get_ce_service_max_yield_time(
+			(struct hif_opaque_softc *)scn);
 
 	qdf_spin_lock(&CE_state->ce_index_lock);
 	/*

hif/src/hif_main.c

@@ -1260,3 +1260,19 @@ void hif_set_initial_wakeup_cb(struct hif_opaque_softc *hif_ctx,
 	scn->initial_wakeup_priv = priv;
 }
 
+void hif_set_ce_service_max_yield_time(struct hif_opaque_softc *hif,
+				       uint8_t ce_service_max_yield_time)
+{
+	struct hif_softc *hif_ctx = HIF_GET_SOFTC(hif);
+
+	hif_ctx->ce_service_max_yield_time =
+		ce_service_max_yield_time * 1000 * 1000;
+}
+
+unsigned long long
+hif_get_ce_service_max_yield_time(struct hif_opaque_softc *hif)
+{
+	struct hif_softc *hif_ctx = HIF_GET_SOFTC(hif);
+
+	return hif_ctx->ce_service_max_yield_time;
+}

hif/src/hif_main.h

@@ -176,6 +176,8 @@ struct hif_softc {
 #ifdef FEATURE_NAPI
 	struct qca_napi_data napi_data;
 #endif /* FEATURE_NAPI */
+	/* stores ce_service_max_yield_time in ns */
+	unsigned long long ce_service_max_yield_time;
 	struct hif_driver_state_callbacks callbacks;
 	uint32_t hif_con_param;
 #ifdef QCA_NSS_WIFI_OFFLOAD_SUPPORT

hif/src/hif_napi.c

@@ -853,6 +853,18 @@ out:
 }
 qdf_export_symbol(hif_napi_poll);
 
+void hif_update_napi_max_poll_time(struct CE_state *ce_state,
+				   struct qca_napi_info *napi_info,
+				   int cpu_id)
+{
+	unsigned long long napi_poll_time = sched_clock() -
+					ce_state->ce_service_start_time;
+
+	if (napi_poll_time >
+			napi_info->stats[cpu_id].napi_max_poll_time)
+		napi_info->stats[cpu_id].napi_max_poll_time = napi_poll_time;
+}
+
 #ifdef HIF_IRQ_AFFINITY
 /**
  *
@@ -890,16 +902,22 @@ void hif_napi_update_yield_stats(struct CE_state *ce_state,
 		return;
 	}
 
-	if (unlikely(NULL == napi_data->napis[ce_id]))
-		return;
-
 	ce_id = ce_state->id;
 	cpu_id = qdf_get_cpu();
 
+	if (unlikely(!napi_data->napis[ce_id])) {
+		HIF_INFO("%s: NAPI info is NULL for ce id: %d",
+			 __func__, ce_id);
+		return;
+	}
+
 	if (time_limit_reached)
 		napi_data->napis[ce_id]->stats[cpu_id].time_limit_reached++;
 	else
 		napi_data->napis[ce_id]->stats[cpu_id].rxpkt_thresh_reached++;
+
+	hif_update_napi_max_poll_time(ce_state, napi_data->napis[ce_id],
+				      cpu_id);
 }
 
 /**

hif/src/hif_napi.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2017 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2018 The Linux Foundation. All rights reserved.
  *
  * Previously licensed under the ISC license by Qualcomm Atheros, Inc.
  *
@@ -255,4 +255,17 @@ static inline int hif_napi_cpu_blacklist(struct qca_napi_data *napid,
 { return 0; }
 #endif /* HIF_IRQ_AFFINITY */
 
+/**
+ * hif_update_napi_max_poll_time() - updates NAPI max poll time
+ * @ce_state: ce state
+ * @napi_info: pointer to napi info structure
+ * @cpu_id: cpu id
+ *
+ * This API updates NAPI max poll time per CE per SPU.
+ *
+ * Return: void
+ */
+void hif_update_napi_max_poll_time(struct CE_state *ce_state,
+				   struct qca_napi_info *napi_info,
+				   int cpu_id);
 #endif /* __HIF_NAPI_H__ */