cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/wireless/ti/wlcore/ps.c

/*
 * This file is part of wl1271
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include "ps.h"
#include "io.h"
#include "tx.h"
#include "debug.h"


#define WL1271_WAKEUP_TIMEOUT 500


#define ELP_ENTRY_DELAY  30

#define ELP_ENTRY_DELAY_FORCE_PS  5


void wl1271_elp_work(struct work_struct *work) { struct delayed_work *dwork; struct wl1271 *wl; struct wl12xx_vif *wlvif; int ret; dwork = to_delayed_work(work); wl = container_of(dwork, struct wl1271, elp_work); wl1271_debug(DEBUG_PSM, "elp work"); mutex_lock(&wl->mutex); if (unlikely(wl->state != WLCORE_STATE_ON)) goto out; /* our work might have been already cancelled */ if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) goto out; if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) goto out; wl12xx_for_each_wlvif(wl, wlvif) { if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) goto out; } wl1271_debug(DEBUG_PSM, "chip to elp"); ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_SLEEP); if (ret < 0) { wl12xx_queue_recovery_work(wl); goto out; } set_bit(WL1271_FLAG_IN_ELP, &wl->flags); out: mutex_unlock(&wl->mutex); }

Contributors

PersonTokensPropCommitsCommitProp
Juuso Oikarinen10050.25%430.77%
Eliad Peller4221.11%323.08%
Luciano Coelho3115.58%215.38%
Ido Yariv2412.06%215.38%
Geliang Tang10.50%17.69%
Eyal Shapira10.50%17.69%
Total199100.00%13100.00%

/* Routines to toggle sleep mode while in ELP */
void wl1271_ps_elp_sleep(struct wl1271 *wl) { struct wl12xx_vif *wlvif; u32 timeout; /* We do not enter elp sleep in PLT mode */ if (wl->plt) return; if (wl->sleep_auth != WL1271_PSM_ELP) return; /* we shouldn't get consecutive sleep requests */ if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))) return; wl12xx_for_each_wlvif(wl, wlvif) { if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) && test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags)) return; } timeout = wl->conf.conn.forced_ps ? ELP_ENTRY_DELAY_FORCE_PS : ELP_ENTRY_DELAY; ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, msecs_to_jiffies(timeout)); }

Contributors

PersonTokensPropCommitsCommitProp
Juuso Oikarinen4539.13%323.08%
Eliad Peller4135.65%430.77%
Igal Chernobelsky108.70%17.69%
Luciano Coelho108.70%323.08%
Yair Shapira86.96%17.69%
Eyal Shapira10.87%17.69%
Total115100.00%13100.00%

EXPORT_SYMBOL_GPL(wl1271_ps_elp_sleep);
int wl1271_ps_elp_wakeup(struct wl1271 *wl) { DECLARE_COMPLETION_ONSTACK(compl); unsigned long flags; int ret; unsigned long start_time = jiffies; bool pending = false; /* * we might try to wake up even if we didn't go to sleep * before (e.g. on boot) */ if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)) return 0; /* don't cancel_sync as it might contend for a mutex and deadlock */ cancel_delayed_work(&wl->elp_work); if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) return 0; wl1271_debug(DEBUG_PSM, "waking up chip from elp"); /* * The spinlock is required here to synchronize both the work and * the completion variable in one entity. */ spin_lock_irqsave(&wl->wl_lock, flags); if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags)) pending = true; else wl->elp_compl = &compl; spin_unlock_irqrestore(&wl->wl_lock, flags); ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP); if (ret < 0) { wl12xx_queue_recovery_work(wl); goto err; } if (!pending) { ret = wait_for_completion_timeout( &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT)); if (ret == 0) { wl1271_error("ELP wakeup timeout!"); wl12xx_queue_recovery_work(wl); ret = -ETIMEDOUT; goto err; } } clear_bit(WL1271_FLAG_IN_ELP, &wl->flags); wl1271_debug(DEBUG_PSM, "wakeup time: %u ms", jiffies_to_msecs(jiffies - start_time)); goto out; err: spin_lock_irqsave(&wl->wl_lock, flags); wl->elp_compl = NULL; spin_unlock_irqrestore(&wl->wl_lock, flags); return ret; out: return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Luciano Coelho19373.38%222.22%
Eliad Peller269.89%111.11%
Ido Yariv249.13%333.33%
Juuso Oikarinen186.84%222.22%
Arik Nemtsov20.76%111.11%
Total263100.00%9100.00%

EXPORT_SYMBOL_GPL(wl1271_ps_elp_wakeup);
int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif, enum wl1271_cmd_ps_mode mode) { int ret; u16 timeout = wl->conf.conn.dynamic_ps_timeout; switch (mode) { case STATION_AUTO_PS_MODE: case STATION_POWER_SAVE_MODE: wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)", mode, timeout); ret = wl1271_acx_wake_up_conditions(wl, wlvif, wl->conf.conn.wake_up_event, wl->conf.conn.listen_interval); if (ret < 0) { wl1271_error("couldn't set wake up conditions"); return ret; } ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout); if (ret < 0) return ret; set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); /* * enable beacon early termination. * Not relevant for 5GHz and for high rates. */ if ((wlvif->band == NL80211_BAND_2GHZ) && (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { ret = wl1271_acx_bet_enable(wl, wlvif, true); if (ret < 0) return ret; } break; case STATION_ACTIVE_MODE: wl1271_debug(DEBUG_PSM, "leaving psm"); /* disable beacon early termination */ if ((wlvif->band == NL80211_BAND_2GHZ) && (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) { ret = wl1271_acx_bet_enable(wl, wlvif, false); if (ret < 0) return ret; } ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0); if (ret < 0) return ret; clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags); break; default: wl1271_warning("trying to set ps to unsupported mode %d", mode); ret = -EINVAL; } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Eyal Shapira8631.73%428.57%
Luciano Coelho8431.00%17.14%
Juuso Oikarinen5419.93%321.43%
Victor Goldenshtein217.75%17.14%
Eliad Peller165.90%321.43%
Shahar Levi82.95%17.14%
Johannes Berg20.74%17.14%
Total271100.00%14100.00%


static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid) { int i; struct sk_buff *skb; struct ieee80211_tx_info *info; unsigned long flags; int filtered[NUM_TX_QUEUES]; struct wl1271_link *lnk = &wl->links[hlid]; /* filter all frames currently in the low level queues for this hlid */ for (i = 0; i < NUM_TX_QUEUES; i++) { filtered[i] = 0; while ((skb = skb_dequeue(&lnk->tx_queue[i]))) { filtered[i]++; if (WARN_ON(wl12xx_is_dummy_packet(wl, skb))) continue; info = IEEE80211_SKB_CB(skb); info->flags |= IEEE80211_TX_STAT_TX_FILTERED; info->status.rates[0].idx = -1; ieee80211_tx_status_ni(wl->hw, skb); } } spin_lock_irqsave(&wl->wl_lock, flags); for (i = 0; i < NUM_TX_QUEUES; i++) { wl->tx_queue_count[i] -= filtered[i]; if (lnk->wlvif) lnk->wlvif->tx_queue_count[i] -= filtered[i]; } spin_unlock_irqrestore(&wl->wl_lock, flags); wl1271_handle_tx_low_watermark(wl); }

Contributors

PersonTokensPropCommitsCommitProp
Arik Nemtsov21899.54%480.00%
Eliad Peller10.46%120.00%
Total219100.00%5100.00%


void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid, bool clean_queues) { struct ieee80211_sta *sta; struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); if (WARN_ON_ONCE(wlvif->bss_type != BSS_TYPE_AP_BSS)) return; if (!test_bit(hlid, wlvif->ap.sta_hlid_map) || test_bit(hlid, &wl->ap_ps_map)) return; wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d " "clean_queues %d", hlid, wl->links[hlid].allocated_pkts, clean_queues); rcu_read_lock(); sta = ieee80211_find_sta(vif, wl->links[hlid].addr); if (!sta) { wl1271_error("could not find sta %pM for starting ps", wl->links[hlid].addr); rcu_read_unlock(); return; } ieee80211_sta_ps_transition_ni(sta, true); rcu_read_unlock(); /* do we want to filter all frames from this link's queues? */ if (clean_queues) wl1271_ps_filter_frames(wl, hlid); __set_bit(hlid, &wl->ap_ps_map); }

Contributors

PersonTokensPropCommitsCommitProp
Arik Nemtsov15490.59%375.00%
Eliad Peller169.41%125.00%
Total170100.00%4100.00%


void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid) { struct ieee80211_sta *sta; struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif); if (!test_bit(hlid, &wl->ap_ps_map)) return; wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid); __clear_bit(hlid, &wl->ap_ps_map); rcu_read_lock(); sta = ieee80211_find_sta(vif, wl->links[hlid].addr); if (!sta) { wl1271_error("could not find sta %pM for ending ps", wl->links[hlid].addr); goto end; } ieee80211_sta_ps_transition_ni(sta, false); end: rcu_read_unlock(); }

Contributors

PersonTokensPropCommitsCommitProp
Arik Nemtsov10586.78%150.00%
Eliad Peller1613.22%150.00%
Total121100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Arik Nemtsov48234.58%715.91%
Luciano Coelho33023.67%511.36%
Juuso Oikarinen21815.64%715.91%
Eliad Peller17212.34%1022.73%
Eyal Shapira886.31%49.09%
Ido Yariv483.44%49.09%
Victor Goldenshtein211.51%12.27%
Igal Chernobelsky141.00%12.27%
Shahar Levi100.72%24.55%
Yair Shapira80.57%12.27%
Johannes Berg20.14%12.27%
Geliang Tang10.07%12.27%
Total1394100.00%44100.00%
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