net/mac80211/pm.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Portions
0004  * Copyright (C) 2020-2021 Intel Corporation
0005  */
0006 #include <net/mac80211.h>
0007 #include <net/rtnetlink.h>
0008
0009 #include "ieee80211_i.h"
0010 #include "mesh.h"
0011 #include "driver-ops.h"
0012 #include "led.h"
0013
0014 static void ieee80211_sched_scan_cancel(struct ieee80211_local *local)
0015 {
0016     if (ieee80211_request_sched_scan_stop(local))
0017         return;
0018     cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0);
0019 }
0020
0021 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
0022 {
0023     struct ieee80211_local *local = hw_to_local(hw);
0024     struct ieee80211_sub_if_data *sdata;
0025     struct sta_info *sta;
0026
0027     if (!local->open_count)
0028         goto suspend;
0029
0030     local->suspending = true;
0031     mb(); /* make suspending visible before any cancellation */
0032
0033     ieee80211_scan_cancel(local);
0034
0035     ieee80211_dfs_cac_cancel(local);
0036
0037     ieee80211_roc_purge(local, NULL);
0038
0039     ieee80211_del_virtual_monitor(local);
0040
0041     if (ieee80211_hw_check(hw, AMPDU_AGGREGATION) &&
0042         !(wowlan && wowlan->any)) {
0043         mutex_lock(&local->sta_mtx);
0044         list_for_each_entry(sta, &local->sta_list, list) {
0045             set_sta_flag(sta, WLAN_STA_BLOCK_BA);
0046             ieee80211_sta_tear_down_BA_sessions(
0047                     sta, AGG_STOP_LOCAL_REQUEST);
0048         }
0049         mutex_unlock(&local->sta_mtx);
0050     }
0051
0052     /* keep sched_scan only in case of 'any' trigger */
0053     if (!(wowlan && wowlan->any))
0054         ieee80211_sched_scan_cancel(local);
0055
0056     ieee80211_stop_queues_by_reason(hw,
0057                     IEEE80211_MAX_QUEUE_MAP,
0058                     IEEE80211_QUEUE_STOP_REASON_SUSPEND,
0059                     false);
0060
0061     /* flush out all packets */
0062     synchronize_net();
0063
0064     ieee80211_flush_queues(local, NULL, true);
0065
0066     local->quiescing = true;
0067     /* make quiescing visible to timers everywhere */
0068     mb();
0069
0070     flush_workqueue(local->workqueue);
0071
0072     /* Don't try to run timers while suspended. */
0073     del_timer_sync(&local->sta_cleanup);
0074
0075      /*
0076      * Note that this particular timer doesn't need to be
0077      * restarted at resume.
0078      */
0079     cancel_work_sync(&local->dynamic_ps_enable_work);
0080     del_timer_sync(&local->dynamic_ps_timer);
0081
0082     local->wowlan = wowlan;
0083     if (local->wowlan) {
0084         int err;
0085
0086         /* Drivers don't expect to suspend while some operations like
0087          * authenticating or associating are in progress. It doesn't
0088          * make sense anyway to accept that, since the authentication
0089          * or association would never finish since the driver can't do
0090          * that on its own.
0091          * Thus, clean up in-progress auth/assoc first.
0092          */
0093         list_for_each_entry(sdata, &local->interfaces, list) {
0094             if (!ieee80211_sdata_running(sdata))
0095                 continue;
0096             if (sdata->vif.type != NL80211_IFTYPE_STATION)
0097                 continue;
0098             ieee80211_mgd_quiesce(sdata);
0099             /* If suspended during TX in progress, and wowlan
0100              * is enabled (connection will be active) there
0101              * can be a race where the driver is put out
0102              * of power-save due to TX and during suspend
0103              * dynamic_ps_timer is cancelled and TX packet
0104              * is flushed, leaving the driver in ACTIVE even
0105              * after resuming until dynamic_ps_timer puts
0106              * driver back in DOZE.
0107              */
0108             if (sdata->u.mgd.associated &&
0109                 sdata->u.mgd.powersave &&
0110                  !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
0111                 local->hw.conf.flags |= IEEE80211_CONF_PS;
0112                 ieee80211_hw_config(local,
0113                             IEEE80211_CONF_CHANGE_PS);
0114             }
0115         }
0116
0117         err = drv_suspend(local, wowlan);
0118         if (err < 0) {
0119             local->quiescing = false;
0120             local->wowlan = false;
0121             if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
0122                 mutex_lock(&local->sta_mtx);
0123                 list_for_each_entry(sta,
0124                             &local->sta_list, list) {
0125                     clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
0126                 }
0127                 mutex_unlock(&local->sta_mtx);
0128             }
0129             ieee80211_wake_queues_by_reason(hw,
0130                     IEEE80211_MAX_QUEUE_MAP,
0131                     IEEE80211_QUEUE_STOP_REASON_SUSPEND,
0132                     false);
0133             return err;
0134         } else if (err > 0) {
0135             WARN_ON(err != 1);
0136             /* cfg80211 will call back into mac80211 to disconnect
0137              * all interfaces, allow that to proceed properly
0138              */
0139             ieee80211_wake_queues_by_reason(hw,
0140                     IEEE80211_MAX_QUEUE_MAP,
0141                     IEEE80211_QUEUE_STOP_REASON_SUSPEND,
0142                     false);
0143             return err;
0144         } else {
0145             goto suspend;
0146         }
0147     }
0148
0149     /* remove all interfaces that were created in the driver */
0150     list_for_each_entry(sdata, &local->interfaces, list) {
0151         if (!ieee80211_sdata_running(sdata))
0152             continue;
0153         switch (sdata->vif.type) {
0154         case NL80211_IFTYPE_AP_VLAN:
0155         case NL80211_IFTYPE_MONITOR:
0156             continue;
0157         case NL80211_IFTYPE_STATION:
0158             ieee80211_mgd_quiesce(sdata);
0159             break;
0160         default:
0161             break;
0162         }
0163
0164         flush_delayed_work(&sdata->dec_tailroom_needed_wk);
0165         drv_remove_interface(local, sdata);
0166     }
0167
0168     /*
0169      * We disconnected on all interfaces before suspend, all channel
0170      * contexts should be released.
0171      */
0172     WARN_ON(!list_empty(&local->chanctx_list));
0173
0174     /* stop hardware - this must stop RX */
0175     ieee80211_stop_device(local);
0176
0177  suspend:
0178     local->suspended = true;
0179     /* need suspended to be visible before quiescing is false */
0180     barrier();
0181     local->quiescing = false;
0182     local->suspending = false;
0183
0184     return 0;
0185 }
0186
0187 /*
0188  * __ieee80211_resume() is a static inline which just calls
0189  * ieee80211_reconfig(), which is also needed for hardware
0190  * hang/firmware failure/etc. recovery.
0191  */
0192
0193 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
0194                     struct cfg80211_wowlan_wakeup *wakeup,
0195                     gfp_t gfp)
0196 {
0197     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
0198
0199     cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
0200 }
0201 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);