net/mac80211/pm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <net/mac80211.h>
   3 #include <net/rtnetlink.h>
   4
   5 #include "ieee80211_i.h"
   6 #include "mesh.h"
   7 #include "driver-ops.h"
   8 #include "led.h"
   9
  10 static void ieee80211_sched_scan_cancel(struct ieee80211_local *local)
  11 {
  12         if (ieee80211_request_sched_scan_stop(local))
  13                 return;
  14         cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy, 0);
  15 }
  16
  17 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
  18 {
  19         struct ieee80211_local *local = hw_to_local(hw);
  20         struct ieee80211_sub_if_data *sdata;
  21         struct sta_info *sta;
  22
  23         if (!local->open_count)
  24                 goto suspend;
  25
  26         ieee80211_scan_cancel(local);
  27
  28         ieee80211_dfs_cac_cancel(local);
  29
  30         ieee80211_roc_purge(local, NULL);
  31
  32         ieee80211_del_virtual_monitor(local);
  33
  34         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION) &&
  35             !(wowlan && wowlan->any)) {
  36                 mutex_lock(&local->sta_mtx);
  37                 list_for_each_entry(sta, &local->sta_list, list) {
  38                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
  39                         ieee80211_sta_tear_down_BA_sessions(
  40                                         sta, AGG_STOP_LOCAL_REQUEST);
  41                 }
  42                 mutex_unlock(&local->sta_mtx);
  43         }
  44
  45         /* keep sched_scan only in case of 'any' trigger */
  46         if (!(wowlan && wowlan->any))
  47                 ieee80211_sched_scan_cancel(local);
  48
  49         ieee80211_stop_queues_by_reason(hw,
  50                                         IEEE80211_MAX_QUEUE_MAP,
  51                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
  52                                         false);
  53
  54         /* flush out all packets */
  55         synchronize_net();
  56
  57         ieee80211_flush_queues(local, NULL, true);
  58
  59         local->quiescing = true;
  60         /* make quiescing visible to timers everywhere */
  61         mb();
  62
  63         flush_workqueue(local->workqueue);
  64
  65         /* Don't try to run timers while suspended. */
  66         del_timer_sync(&local->sta_cleanup);
  67
  68          /*
  69          * Note that this particular timer doesn't need to be
  70          * restarted at resume.
  71          */
  72         cancel_work_sync(&local->dynamic_ps_enable_work);
  73         del_timer_sync(&local->dynamic_ps_timer);
  74
  75         local->wowlan = wowlan;
  76         if (local->wowlan) {
  77                 int err;
  78
  79                 /* Drivers don't expect to suspend while some operations like
  80                  * authenticating or associating are in progress. It doesn't
  81                  * make sense anyway to accept that, since the authentication
  82                  * or association would never finish since the driver can't do
  83                  * that on its own.
  84                  * Thus, clean up in-progress auth/assoc first.
  85                  */
  86                 list_for_each_entry(sdata, &local->interfaces, list) {
  87                         if (!ieee80211_sdata_running(sdata))
  88                                 continue;
  89                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
  90                                 continue;
  91                         ieee80211_mgd_quiesce(sdata);
  92                         /* If suspended during TX in progress, and wowlan
  93                          * is enabled (connection will be active) there
  94                          * can be a race where the driver is put out
  95                          * of power-save due to TX and during suspend
  96                          * dynamic_ps_timer is cancelled and TX packet
  97                          * is flushed, leaving the driver in ACTIVE even
  98                          * after resuming until dynamic_ps_timer puts
  99                          * driver back in DOZE.
 100                          */
 101                         if (sdata->u.mgd.associated &&
 102                             sdata->u.mgd.powersave &&
 103                              !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
 104                                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 105                                 ieee80211_hw_config(local,
 106                                                     IEEE80211_CONF_CHANGE_PS);
 107                         }
 108                 }
 109
 110                 err = drv_suspend(local, wowlan);
 111                 if (err < 0) {
 112                         local->quiescing = false;
 113                         local->wowlan = false;
 114                         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
 115                                 mutex_lock(&local->sta_mtx);
 116                                 list_for_each_entry(sta,
 117                                                     &local->sta_list, list) {
 118                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 119                                 }
 120                                 mutex_unlock(&local->sta_mtx);
 121                         }
 122                         ieee80211_wake_queues_by_reason(hw,
 123                                         IEEE80211_MAX_QUEUE_MAP,
 124                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 125                                         false);
 126                         return err;
 127                 } else if (err > 0) {
 128                         WARN_ON(err != 1);
 129                         /* cfg80211 will call back into mac80211 to disconnect
 130                          * all interfaces, allow that to proceed properly
 131                          */
 132                         ieee80211_wake_queues_by_reason(hw,
 133                                         IEEE80211_MAX_QUEUE_MAP,
 134                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 135                                         false);
 136                         return err;
 137                 } else {
 138                         goto suspend;
 139                 }
 140         }
 141
 142         /* remove all interfaces that were created in the driver */
 143         list_for_each_entry(sdata, &local->interfaces, list) {
 144                 if (!ieee80211_sdata_running(sdata))
 145                         continue;
 146                 switch (sdata->vif.type) {
 147                 case NL80211_IFTYPE_AP_VLAN:
 148                 case NL80211_IFTYPE_MONITOR:
 149                         continue;
 150                 case NL80211_IFTYPE_STATION:
 151                         ieee80211_mgd_quiesce(sdata);
 152                         break;
 153                 case NL80211_IFTYPE_WDS:
 154                         /* tear down aggregation sessions and remove STAs */
 155                         mutex_lock(&local->sta_mtx);
 156                         sta = sdata->u.wds.sta;
 157                         if (sta && sta->uploaded) {
 158                                 enum ieee80211_sta_state state;
 159
 160                                 state = sta->sta_state;
 161                                 for (; state > IEEE80211_STA_NOTEXIST; state--)
 162                                         WARN_ON(drv_sta_state(local, sta->sdata,
 163                                                               sta, state,
 164                                                               state - 1));
 165                         }
 166                         mutex_unlock(&local->sta_mtx);
 167                         break;
 168                 default:
 169                         break;
 170                 }
 171
 172                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 173                 drv_remove_interface(local, sdata);
 174         }
 175
 176         /*
 177          * We disconnected on all interfaces before suspend, all channel
 178          * contexts should be released.
 179          */
 180         WARN_ON(!list_empty(&local->chanctx_list));
 181
 182         /* stop hardware - this must stop RX */
 183         ieee80211_stop_device(local);
 184
 185  suspend:
 186         local->suspended = true;
 187         /* need suspended to be visible before quiescing is false */
 188         barrier();
 189         local->quiescing = false;
 190
 191         return 0;
 192 }
 193
 194 /*
 195  * __ieee80211_resume() is a static inline which just calls
 196  * ieee80211_reconfig(), which is also needed for hardware
 197  * hang/firmware failure/etc. recovery.
 198  */
 199
 200 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 201                                     struct cfg80211_wowlan_wakeup *wakeup,
 202                                     gfp_t gfp)
 203 {
 204         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 205
 206         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 207 }
 208 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);