qcacld-3.0: Prevent 2.4G connection when SAP is on DFS channel

On single MAC devices, when a SAP or P2P-GO is already operating
on a DFS channel, MCC mode is not allowed. It is  currently
possible, even with a SAP on DFS channel, to connect to a 2.4G
AP using the command: iw interface connect SSID [AP freq]
Add additional checks in policy manager to prevent this
MCC situation.

Change-Id: I9adf063fbc1cb4c2d3f22f6b4d1bb00beb079007
CRs-Fixed: 2485436

components/cmn_services/policy_mgr/inc/wlan_policy_mgr_api.h

@@ -1986,6 +1986,18 @@ void policy_mgr_hw_mode_transition_cb(uint32_t old_hw_mode_index,
  */
 bool policy_mgr_current_concurrency_is_mcc(struct wlan_objmgr_psoc *psoc);
 
+/**
+ * policy_mgr_is_sap_p2pgo_on_dfs() - check if there is a P2PGO or SAP
+ * operating in a DFS channel
+ * @psoc: PSOC object information
+ * This routine is called to check if there is a P2PGO/SAP on DFS channel
+ *
+ * Return: True  - P2PGO/SAP present on DFS Channel
+ * False - Otherwise
+ */
+
+bool policy_mgr_is_sap_p2pgo_on_dfs(struct wlan_objmgr_psoc *psoc);
+
 /**
  * policy_mgr_register_sme_cb() - register SME callbacks
  * @psoc: PSOC object information

components/cmn_services/policy_mgr/src/wlan_policy_mgr_get_set_utils.c

@@ -1455,6 +1455,51 @@ bool policy_mgr_current_concurrency_is_mcc(struct wlan_objmgr_psoc *psoc)
 	return is_mcc;
 }
 
+bool policy_mgr_is_sap_p2pgo_on_dfs(struct wlan_objmgr_psoc *psoc)
+{
+	int index, count;
+	uint32_t list[MAX_NUMBER_OF_CONC_CONNECTIONS];
+	struct policy_mgr_psoc_priv_obj *pm_ctx = NULL;
+
+	if (psoc)
+		pm_ctx = policy_mgr_get_context(psoc);
+
+	if (!pm_ctx) {
+		policy_mgr_err("Invalid Context");
+		return false;
+	}
+
+	index = 0;
+	qdf_mutex_acquire(&pm_ctx->qdf_conc_list_lock);
+	count = policy_mgr_mode_specific_connection_count(psoc,
+							  PM_SAP_MODE,
+							  list);
+	while (index < count) {
+		if (wlan_reg_is_dfs_ch(pm_ctx->pdev,
+				       pm_conc_connection_list
+				       [list[index]].chan)){
+			qdf_mutex_release(&pm_ctx->qdf_conc_list_lock);
+			return true;
+		}
+		index++;
+	}
+	count = policy_mgr_mode_specific_connection_count(psoc,
+							  PM_P2P_GO_MODE,
+							  list);
+	index = 0;
+	while (index < count) {
+		if (wlan_reg_is_dfs_ch(pm_ctx->pdev,
+				       pm_conc_connection_list
+				       [list[index]].chan)){
+			qdf_mutex_release(&pm_ctx->qdf_conc_list_lock);
+			return true;
+		}
+		index++;
+	}
+	qdf_mutex_release(&pm_ctx->qdf_conc_list_lock);
+	return false;
+}
+
 /**
  * policy_mgr_set_concurrency_mode() - To set concurrency mode
  * @psoc: PSOC object data
@@ -2045,6 +2090,9 @@ bool policy_mgr_is_concurrency_allowed(struct wlan_objmgr_psoc *psoc,
 		 *    DFS channel then allow concurrency but make sure it is
 		 *    going to DBS and send PCL to firmware indicating that
 		 *    don't allow STA to roam to 5G channels.
+		 * 4) On a single MAC device, if a SAP/P2PGO is already on a DFS
+		 *    channel, don't allow a 2 channel as it will result
+		 *    in MCC which is not allowed.
 		 */
 		if (!policy_mgr_is_5g_channel_allowed(psoc,
 			channel, list, PM_P2P_GO_MODE))
@@ -2067,6 +2115,15 @@ bool policy_mgr_is_concurrency_allowed(struct wlan_objmgr_psoc *psoc,
 			policy_mgr_err("No MCC, SAP/GO about to come up on DFS channel");
 			goto done;
 		}
+		if ((policy_mgr_is_hw_dbs_capable(psoc) != true) &&
+		    num_connections) {
+			if (WLAN_REG_IS_24GHZ_CH(channel)) {
+				if (policy_mgr_is_sap_p2pgo_on_dfs(psoc)) {
+					policy_mgr_err("MCC not allowed: SAP/P2PGO on DFS");
+					goto done;
+				}
+			}
+		}
 	}
 
 	count = policy_mgr_mode_specific_connection_count(psoc, PM_STA_MODE,
@@ -2176,7 +2233,6 @@ bool policy_mgr_is_concurrency_allowed(struct wlan_objmgr_psoc *psoc,
 		policy_mgr_err("This concurrency combination is not allowed");
 		goto done;
 	}
-
 	/* don't allow two P2P GO on same band */
 	if (channel && (mode == PM_P2P_GO_MODE) && num_connections) {
 		index = 0;