net/mac80211/pm.c

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