cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

pmc.c (2425B)

      1/*
      2 * Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com>
      3 *
      4 * Permission to use, copy, modify, and/or distribute this software for any
      5 * purpose with or without fee is hereby granted, provided that the above
      6 * copyright notice and this permission notice appear in all copies.
      7 *
      8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
     13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     15 */
     16
     17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
     18
     19#include "wcn36xx.h"
     20
     21#define WCN36XX_BMPS_FAIL_THREHOLD 3
     22
     23int wcn36xx_pmc_enter_bmps_state(struct wcn36xx *wcn,
     24				 struct ieee80211_vif *vif)
     25{
     26	int ret = 0;
     27	struct wcn36xx_vif *vif_priv = wcn36xx_vif_to_priv(vif);
     28	/* TODO: Make sure the TX chain clean */
     29	ret = wcn36xx_smd_enter_bmps(wcn, vif);
     30	if (!ret) {
     31		wcn36xx_dbg(WCN36XX_DBG_PMC, "Entered BMPS\n");
     32		vif_priv->pw_state = WCN36XX_BMPS;
     33		vif_priv->bmps_fail_ct = 0;
     34		vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
     35	} else {
     36		/*
     37		 * One of the reasons why HW will not enter BMPS is because
     38		 * driver is trying to enter bmps before first beacon was
     39		 * received just after auth complete
     40		 */
     41		wcn36xx_err("Can not enter BMPS!\n");
     42
     43		if (vif_priv->bmps_fail_ct++ == WCN36XX_BMPS_FAIL_THREHOLD) {
     44			ieee80211_connection_loss(vif);
     45			vif_priv->bmps_fail_ct = 0;
     46		}
     47	}
     48	return ret;
     49}
     50
     51int wcn36xx_pmc_exit_bmps_state(struct wcn36xx *wcn,
     52				struct ieee80211_vif *vif)
     53{
     54	struct wcn36xx_vif *vif_priv = wcn36xx_vif_to_priv(vif);
     55
     56	if (WCN36XX_BMPS != vif_priv->pw_state) {
     57		/* Unbalanced call or last BMPS enter failed */
     58		wcn36xx_dbg(WCN36XX_DBG_PMC,
     59			    "Not in BMPS mode, no need to exit\n");
     60		return -EALREADY;
     61	}
     62	wcn36xx_smd_exit_bmps(wcn, vif);
     63	vif_priv->pw_state = WCN36XX_FULL_POWER;
     64	vif->driver_flags &= ~IEEE80211_VIF_BEACON_FILTER;
     65	return 0;
     66}
     67
     68int wcn36xx_enable_keep_alive_null_packet(struct wcn36xx *wcn,
     69					  struct ieee80211_vif *vif)
     70{
     71	wcn36xx_dbg(WCN36XX_DBG_PMC, "%s\n", __func__);
     72	return wcn36xx_smd_keep_alive_req(wcn, vif,
     73					  WCN36XX_HAL_KEEP_ALIVE_NULL_PKT);
     74}