qcacld-3.0: Add software latency manager base code

Add the basic attach code for software latency
manager.

Software latency manager currently tries to
handle the srng register write coaslescing
only.

Change-Id: I23cddf32a52f091b7c66d821e0625656e1a5af23
CRs-Fixed: 2759134

core/dp/txrx3.0/dp_swlm.c

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2020, 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 above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifdef WLAN_DP_FEATURE_SW_LATENCY_MGR
+
+#include "dp_swlm.h"
+
+/**
+ * dp_tcl_should_coalesc() - To know if the current TCL reg write is to be
+ *			     processed or coalesced.
+ * @soc: Datapath global soc handle
+ * @tx_desc: descriptor for the current packet to be transmitted
+ *
+ * This function takes into account the current tx and rx throughput and
+ * decides whether the TCL register write corresponding to the current packet,
+ * to be transmitted, is to be processed or coalesced.
+ * It maintains a session for which the TCL register writes are coalesced and
+ * then flushed if a certain time/bytes threshold is reached.
+ *
+ * Returns: 1 if the current TCL write is to be coalesced
+ *	    0, if the current TCL write is to be processed.
+ */
+static int dp_tcl_should_coalesc(struct dp_soc *soc,
+				 struct dp_tx_desc_s *tx_desc)
+{
+	return 0;
+}
+
+/**
+ * dp_swlm_query_policy() - apply software latency policy based on ring type.
+ * @soc: Datapath global soc handle
+ * @ring_type: SRNG type
+ * @query_data: private data for the query corresponding to the ring type
+ *
+ * Returns: 0 always
+ */
+int dp_swlm_query_policy(struct dp_soc *soc, int ring_type,
+			 union swlm_data query_data)
+{
+	if (qdf_unlikely(!soc->swlm.is_enabled))
+		return 0;
+
+	switch (ring_type) {
+	case TCL_DATA:
+		return soc->swlm.ops->tcl_should_coalesc(soc,
+							 query_data.tx_desc);
+	default:
+		break
+	}
+
+	return 0;
+}
+
+struct dp_swlm_ops dp_latency_mgr_ops = {
+	.tcl_should_coalesc = dp_tcl_should_coalesc,
+};
+
+/**
+ * dp_soc_swlm_attach() - attach the software latency manager resources
+ * @soc: Datapath global soc handle
+ *
+ * Returns: QDF_STATUS
+ */
+QDF_STATUS dp_soc_swlm_attach(struct dp_soc *soc)
+{
+	soc->swlm.ops = &dp_latency_mgr_ops;
+	soc->swlm.is_enabled = true;
+
+	return QDF_STATUS_SUCCESS;
+}
+
+#endif /* WLAN_DP_FEATURE_SW_LATENCY_MGR */

core/dp/txrx3.0/dp_swlm.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2020, 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 above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _DP_SWLM_H_
+#define _DP_SWLM_H_
+
+#include <dp_types.h>
+#include <dp_internal.h>
+
+#endif