net/mac80211/pm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Portions
   4  * Copyright (C) 2020-2021, 2023 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
  14 static 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
  21 int __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);
  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         del_timer_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         del_timer_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,
 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);
 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
 192 void 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 }
 200 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);