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         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                 mutex_lock(&local->sta_mtx);
  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                 mutex_unlock(&local->sta_mtx);
  50         }
  51
  52         /* keep sched_scan only in case of 'any' trigger */
  53         if (!(wowlan && wowlan->any))
  54                 ieee80211_sched_scan_cancel(local);
  55
  56         ieee80211_stop_queues_by_reason(hw,
  57                                         IEEE80211_MAX_QUEUE_MAP,
  58                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
  59                                         false);
  60
  61         /* flush out all packets */
  62         synchronize_net();
  63
  64         ieee80211_flush_queues(local, NULL, true);
  65
  66         local->quiescing = true;
  67         /* make quiescing visible to timers everywhere */
  68         mb();
  69
  70         flush_workqueue(local->workqueue);
  71
  72         /* Don't try to run timers while suspended. */
  73         del_timer_sync(&local->sta_cleanup);
  74
  75          /*
  76          * Note that this particular timer doesn't need to be
  77          * restarted at resume.
  78          */
  79         cancel_work_sync(&local->dynamic_ps_enable_work);
  80         del_timer_sync(&local->dynamic_ps_timer);
  81
  82         local->wowlan = wowlan;
  83         if (local->wowlan) {
  84                 int err;
  85
  86                 /* Drivers don't expect to suspend while some operations like
  87                  * authenticating or associating are in progress. It doesn't
  88                  * make sense anyway to accept that, since the authentication
  89                  * or association would never finish since the driver can't do
  90                  * that on its own.
  91                  * Thus, clean up in-progress auth/assoc first.
  92                  */
  93                 list_for_each_entry(sdata, &local->interfaces, list) {
  94                         if (!ieee80211_sdata_running(sdata))
  95                                 continue;
  96                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
  97                                 continue;
  98                         ieee80211_mgd_quiesce(sdata);
  99                         /* If suspended during TX in progress, and wowlan
 100                          * is enabled (connection will be active) there
 101                          * can be a race where the driver is put out
 102                          * of power-save due to TX and during suspend
 103                          * dynamic_ps_timer is cancelled and TX packet
 104                          * is flushed, leaving the driver in ACTIVE even
 105                          * after resuming until dynamic_ps_timer puts
 106                          * driver back in DOZE.
 107                          */
 108                         if (sdata->u.mgd.associated &&
 109                             sdata->u.mgd.powersave &&
 110                              !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
 111                                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 112                                 ieee80211_hw_config(local,
 113                                                     IEEE80211_CONF_CHANGE_PS);
 114                         }
 115                 }
 116
 117                 err = drv_suspend(local, wowlan);
 118                 if (err < 0) {
 119                         local->quiescing = false;
 120                         local->wowlan = false;
 121                         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
 122                                 mutex_lock(&local->sta_mtx);
 123                                 list_for_each_entry(sta,
 124                                                     &local->sta_list, list) {
 125                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 126                                 }
 127                                 mutex_unlock(&local->sta_mtx);
 128                         }
 129                         ieee80211_wake_queues_by_reason(hw,
 130                                         IEEE80211_MAX_QUEUE_MAP,
 131                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 132                                         false);
 133                         return err;
 134                 } else if (err > 0) {
 135                         WARN_ON(err != 1);
 136                         /* cfg80211 will call back into mac80211 to disconnect
 137                          * all interfaces, allow that to proceed properly
 138                          */
 139                         ieee80211_wake_queues_by_reason(hw,
 140                                         IEEE80211_MAX_QUEUE_MAP,
 141                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 142                                         false);
 143                         return err;
 144                 } else {
 145                         goto suspend;
 146                 }
 147         }
 148
 149         /* remove all interfaces that were created in the driver */
 150         list_for_each_entry(sdata, &local->interfaces, list) {
 151                 if (!ieee80211_sdata_running(sdata))
 152                         continue;
 153                 switch (sdata->vif.type) {
 154                 case NL80211_IFTYPE_AP_VLAN:
 155                 case NL80211_IFTYPE_MONITOR:
 156                         continue;
 157                 case NL80211_IFTYPE_STATION:
 158                         ieee80211_mgd_quiesce(sdata);
 159                         break;
 160                 default:
 161                         break;
 162                 }
 163
 164                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 165                 drv_remove_interface(local, sdata);
 166         }
 167
 168         /*
 169          * We disconnected on all interfaces before suspend, all channel
 170          * contexts should be released.
 171          */
 172         WARN_ON(!list_empty(&local->chanctx_list));
 173
 174         /* stop hardware - this must stop RX */
 175         ieee80211_stop_device(local);
 176
 177  suspend:
 178         local->suspended = true;
 179         /* need suspended to be visible before quiescing is false */
 180         barrier();
 181         local->quiescing = false;
 182         local->suspending = false;
 183
 184         return 0;
 185 }
 186
 187 /*
 188  * __ieee80211_resume() is a static inline which just calls
 189  * ieee80211_reconfig(), which is also needed for hardware
 190  * hang/firmware failure/etc. recovery.
 191  */
 192
 193 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 194                                     struct cfg80211_wowlan_wakeup *wakeup,
 195                                     gfp_t gfp)
 196 {
 197         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 198
 199         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 200 }
 201 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);