pm.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Portions
  4 * Copyright (C) 2020-2021, 2023-2024 Intel Corporation
  5 */
  6#include <net/mac80211.h>
  7#include <net/rtnetlink.h>
  8
  9#include "ieee80211_i.h"
 10#include "mesh.h"
 11#include "driver-ops.h"
 12#include "led.h"
 13
 14static void ieee80211_sched_scan_cancel(struct ieee80211_local *local)
 15{
 16	if (ieee80211_request_sched_scan_stop(local))
 17		return;
 18	cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0);
 19}
 20
 21int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 22{
 23	struct ieee80211_local *local = hw_to_local(hw);
 24	struct ieee80211_sub_if_data *sdata;
 25	struct sta_info *sta;
 26
 27	if (!local->open_count)
 28		goto suspend;
 29
 30	local->suspending = true;
 31	mb(); /* make suspending visible before any cancellation */
 32
 33	ieee80211_scan_cancel(local);
 34
 35	ieee80211_dfs_cac_cancel(local, NULL);
 36
 37	ieee80211_roc_purge(local, NULL);
 38
 39	ieee80211_del_virtual_monitor(local);
 40
 41	if (ieee80211_hw_check(hw, AMPDU_AGGREGATION) &&
 42	    !(wowlan && wowlan->any)) {
 43		lockdep_assert_wiphy(local->hw.wiphy);
 44		list_for_each_entry(sta, &local->sta_list, list) {
 45			set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 46			ieee80211_sta_tear_down_BA_sessions(
 47					sta, AGG_STOP_LOCAL_REQUEST);
 48		}
 49	}
 50
 51	/* keep sched_scan only in case of 'any' trigger */
 52	if (!(wowlan && wowlan->any))
 53		ieee80211_sched_scan_cancel(local);
 54
 55	ieee80211_stop_queues_by_reason(hw,
 56					IEEE80211_MAX_QUEUE_MAP,
 57					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 58					false);
 59
 60	/* flush out all packets */
 61	synchronize_net();
 62
 63	ieee80211_flush_queues(local, NULL, true);
 64
 65	local->quiescing = true;
 66	/* make quiescing visible to timers everywhere */
 67	mb();
 68
 69	flush_workqueue(local->workqueue);
 70
 71	/* Don't try to run timers while suspended. */
 72	timer_delete_sync(&local->sta_cleanup);
 73
 74	 /*
 75	 * Note that this particular timer doesn't need to be
 76	 * restarted at resume.
 77	 */
 78	wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work);
 79	timer_delete_sync(&local->dynamic_ps_timer);
 80
 81	local->wowlan = wowlan;
 82	if (local->wowlan) {
 83		int err;
 84
 85		/* Drivers don't expect to suspend while some operations like
 86		 * authenticating or associating are in progress. It doesn't
 87		 * make sense anyway to accept that, since the authentication
 88		 * or association would never finish since the driver can't do
 89		 * that on its own.
 90		 * Thus, clean up in-progress auth/assoc first.
 91		 */
 92		list_for_each_entry(sdata, &local->interfaces, list) {
 93			if (!ieee80211_sdata_running(sdata))
 94				continue;
 95			if (sdata->vif.type != NL80211_IFTYPE_STATION)
 96				continue;
 97			ieee80211_mgd_quiesce(sdata);
 98			/* If suspended during TX in progress, and wowlan
 99			 * is enabled (connection will be active) there
100			 * can be a race where the driver is put out
101			 * of power-save due to TX and during suspend
102			 * dynamic_ps_timer is cancelled and TX packet
103			 * is flushed, leaving the driver in ACTIVE even
104			 * after resuming until dynamic_ps_timer puts
105			 * driver back in DOZE.
106			 */
107			if (sdata->u.mgd.associated &&
108			    sdata->u.mgd.powersave &&
109			     !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
110				local->hw.conf.flags |= IEEE80211_CONF_PS;
111				ieee80211_hw_config(local, -1,
112						    IEEE80211_CONF_CHANGE_PS);
113			}
114		}
115
116		err = drv_suspend(local, wowlan);
117		if (err < 0) {
118			local->quiescing = false;
119			local->wowlan = false;
120			if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
121				lockdep_assert_wiphy(local->hw.wiphy);
122				list_for_each_entry(sta,
123						    &local->sta_list, list) {
124					clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
125				}
126			}
127			ieee80211_wake_queues_by_reason(hw,
128					IEEE80211_MAX_QUEUE_MAP,
129					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
130					false);
131			return err;
132		} else if (err > 0) {
133			WARN_ON(err != 1);
134			/* cfg80211 will call back into mac80211 to disconnect
135			 * all interfaces, allow that to proceed properly
136			 */
137			ieee80211_wake_queues_by_reason(hw,
138					IEEE80211_MAX_QUEUE_MAP,
139					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
140					false);
141			return err;
142		} else {
143			goto suspend;
144		}
145	}
146
147	/* remove all interfaces that were created in the driver */
148	list_for_each_entry(sdata, &local->interfaces, list) {
149		if (!ieee80211_sdata_running(sdata))
150			continue;
151		switch (sdata->vif.type) {
152		case NL80211_IFTYPE_AP_VLAN:
153		case NL80211_IFTYPE_MONITOR:
154			continue;
155		case NL80211_IFTYPE_STATION:
156			ieee80211_mgd_quiesce(sdata);
157			break;
158		default:
159			break;
160		}
161
162		wiphy_delayed_work_flush(local->hw.wiphy,
163					 &sdata->dec_tailroom_needed_wk);
164		drv_remove_interface(local, sdata);
165	}
166
167	/*
168	 * We disconnected on all interfaces before suspend, all channel
169	 * contexts should be released.
170	 */
171	WARN_ON(!list_empty(&local->chanctx_list));
172
173	/* stop hardware - this must stop RX */
174	ieee80211_stop_device(local, true);
175
176 suspend:
177	local->suspended = true;
178	/* need suspended to be visible before quiescing is false */
179	barrier();
180	local->quiescing = false;
181	local->suspending = false;
182
183	return 0;
184}
185
186/*
187 * __ieee80211_resume() is a static inline which just calls
188 * ieee80211_reconfig(), which is also needed for hardware
189 * hang/firmware failure/etc. recovery.
190 */
191
192void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
193				    struct cfg80211_wowlan_wakeup *wakeup,
194				    gfp_t gfp)
195{
196	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
197
198	cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
199}
200EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);