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Wysocki" , Viresh Kumar , MyungJoo Ham , "Kyungmin Park" , Chanwoo Choi , Matthias Brugger , AngeloGioacchino Del Regno CC: , , , , , Subject: [PATCH v1 1/2] PM / devfreq: mediatek: protect oop in critical session Date: Fri, 13 Sep 2024 18:39:32 +0800 Message-ID: <20240913103933.30895-2-chun-jen.tseng@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20240913103933.30895-1-chun-jen.tseng@mediatek.com> References: <20240913103933.30895-1-chun-jen.tseng@mediatek.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--4.484100-8.000000 X-TMASE-MatchedRID: LAlCrEnopVXUzvcPSorAlFz+axQLnAVBtGonEOW5g+agaf0+XUrNk3kk h754FS8n6DB7yJ7eUTP0VyIrxg+OJcZEoJx1HltluIwLnB3Aqp25+1figft3Lg5SzgJNSArLkVq DBn//HhImL4e5hLr+f0mZgncXR4mgGAdnzrnkM48URSScn+QSXt0H8LFZNFG7doMssNsUwYVV2Y FKivUXnovjZuoPNVwq7Ouc1TlJj0nz/pMg4hZ1PL27cYXrOln+oV7D15FntQdDvz+t8eVtJ0AAL As+DNqOStqwsbgFR/qAhOcaQrQ0U1GyRcoeF18qmKP0zzpTAeGwod8xOMKmvA1Aka/KIp/p X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--4.484100-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: FC2A249B0FAC5904A78B645CACC39F666E4A44308525607319F5BE191941A9442000:8 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" mtk_ccifreq_target() & mtk_ccifreq_opp_notifier() is re-enter funtion when cpufreq governor is more than one. It should add global mutex to protect OPP , avoid get wrong frequency & voltage. Signed-off-by: Mark Tseng --- drivers/devfreq/mtk-cci-devfreq.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/devfreq/mtk-cci-devfreq.c b/drivers/devfreq/mtk-cci-de= vfreq.c index 7ad5225b0381..293cf81e53fe 100644 --- a/drivers/devfreq/mtk-cci-devfreq.c +++ b/drivers/devfreq/mtk-cci-devfreq.c @@ -29,13 +29,14 @@ struct mtk_ccifreq_drv { struct clk *inter_clk; int inter_voltage; unsigned long pre_freq; - /* Avoid race condition for regulators between notify and policy */ - struct mutex reg_lock; struct notifier_block opp_nb; const struct mtk_ccifreq_platform_data *soc_data; int vtrack_max; }; =20 +/* Avoid race condition for regulators between notify and policy */ +static DEFINE_MUTEX(reg_lock); + static int mtk_ccifreq_set_voltage(struct mtk_ccifreq_drv *drv, int new_vo= ltage) { const struct mtk_ccifreq_platform_data *soc_data =3D drv->soc_data; @@ -125,22 +126,20 @@ static int mtk_ccifreq_set_voltage(struct mtk_ccifreq= _drv *drv, int new_voltage) static int mtk_ccifreq_target(struct device *dev, unsigned long *freq, u32 flags) { - struct mtk_ccifreq_drv *drv =3D dev_get_drvdata(dev); + struct mtk_ccifreq_drv *drv; struct clk *cci_pll; struct dev_pm_opp *opp; unsigned long opp_rate; int voltage, pre_voltage, inter_voltage, target_voltage, ret; =20 + mutex_lock(®_lock); + + drv =3D dev_get_drvdata(dev); if (!drv) return -EINVAL; =20 - if (drv->pre_freq =3D=3D *freq) - return 0; - - mutex_lock(&drv->reg_lock); - - inter_voltage =3D drv->inter_voltage; cci_pll =3D clk_get_parent(drv->cci_clk); + inter_voltage =3D drv->inter_voltage; =20 opp_rate =3D *freq; opp =3D devfreq_recommended_opp(dev, &opp_rate, 1); @@ -206,7 +205,7 @@ static int mtk_ccifreq_target(struct device *dev, unsig= ned long *freq, } =20 drv->pre_freq =3D *freq; - mutex_unlock(&drv->reg_lock); + mutex_unlock(®_lock); =20 return 0; =20 @@ -214,21 +213,23 @@ static int mtk_ccifreq_target(struct device *dev, uns= igned long *freq, mtk_ccifreq_set_voltage(drv, pre_voltage); =20 out_unlock: - mutex_unlock(&drv->reg_lock); + mutex_unlock(®_lock); return ret; } =20 static int mtk_ccifreq_opp_notifier(struct notifier_block *nb, unsigned long event, void *data) { - struct dev_pm_opp *opp =3D data; + struct dev_pm_opp *opp; struct mtk_ccifreq_drv *drv; unsigned long freq, volt; =20 + mutex_lock(®_lock); + + opp =3D data; drv =3D container_of(nb, struct mtk_ccifreq_drv, opp_nb); =20 if (event =3D=3D OPP_EVENT_ADJUST_VOLTAGE) { - mutex_lock(&drv->reg_lock); freq =3D dev_pm_opp_get_freq(opp); =20 /* current opp item is changed */ @@ -236,8 +237,8 @@ static int mtk_ccifreq_opp_notifier(struct notifier_blo= ck *nb, volt =3D dev_pm_opp_get_voltage(opp); mtk_ccifreq_set_voltage(drv, volt); } - mutex_unlock(&drv->reg_lock); } + mutex_unlock(®_lock); =20 return 0; } @@ -262,7 +263,6 @@ static int mtk_ccifreq_probe(struct platform_device *pd= ev) drv->dev =3D dev; drv->soc_data =3D (const struct mtk_ccifreq_platform_data *) of_device_get_match_data(&pdev->dev); - mutex_init(&drv->reg_lock); platform_set_drvdata(pdev, drv); =20 drv->cci_clk =3D devm_clk_get(dev, "cci"); --=20 2.45.2 From nobody Thu Sep 19 10:37:35 2024 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CCD371D86E0; 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Fri, 13 Sep 2024 18:39:40 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Fri, 13 Sep 2024 18:39:37 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Fri, 13 Sep 2024 18:39:37 +0800 From: Mark Tseng To: "Rafael J . Wysocki" , Viresh Kumar , MyungJoo Ham , "Kyungmin Park" , Chanwoo Choi , Matthias Brugger , AngeloGioacchino Del Regno CC: , , , , , Subject: [PATCH v1 2/2] cpufreq: mediatek: Fixed cpufreq has 2 policy will cause concurrency Date: Fri, 13 Sep 2024 18:39:33 +0800 Message-ID: <20240913103933.30895-3-chun-jen.tseng@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20240913103933.30895-1-chun-jen.tseng@mediatek.com> References: <20240913103933.30895-1-chun-jen.tseng@mediatek.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--13.646400-8.000000 X-TMASE-MatchedRID: NRO3hbO9xfYsJluZlyHlY8AmcZEx8XHJnQkHrAHoKqYA6s2mIXI3kAQH T64gg+vfhbvmKbpIiCZEzxsFM1euZkzhWNnvpqvYXP5rFAucBUEjs7F41+YP7NSVUkz9BPXec1B UAZEsVDboMHvInt5RM8tR/vbsBoBQ7DvDbr7RMEril2r2x2PwtQrefVId6fzVdxcn1spsVVkoSp oF9H5fPdQPqLBIkXdW57+d6CGh74J/Kgj3tMS/EMFHAfWALUlhAn4P7FuKVFAiPSULBgbDb+g6D D179VtATIPFmUsu9TBMwbPxIFtiF7MywGOaB4QQngIgpj8eDcAZ1CdBJOsoY8RB0bsfrpPIXzYx eQR1Dvteoc8+S50jzaLdGITE8Df+vw7wTiLlKfCj07KR8K62ZL1knp3UBvYm X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--13.646400-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: 5968523419A560E3B6635D9CEC4A214E18E49A95633F58B26A814CDDCA359DDB2000:8 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" mtk_cpufreq_set_target() is re-enter function but the mutex lock decalre in mtk_cpu_dvfs_info structure for each policy. It should change to global variable for critical session avoid policy get wrong OPP. SoC with CCI architecture should set transition_delay to 10 ms because cpufreq need to call devfreq notifier in async mode. if delay less than 10ms may get wrong OPP-level in CCI driver. Add CPUFREQ_ASYNC_NOTIFICATION flages for cpufreq policy because some of process will get CPU frequency by cpufreq sysfs node. It may get wrong frequency then call cpufreq_out_of_sync() to fixed frequency. Signed-off-by: Mark Tseng --- drivers/cpufreq/mediatek-cpufreq.c | 65 ++++++++++++++++++++++-------- 1 file changed, 49 insertions(+), 16 deletions(-) diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-= cpufreq.c index 663f61565cf7..3303b6d72ea7 100644 --- a/drivers/cpufreq/mediatek-cpufreq.c +++ b/drivers/cpufreq/mediatek-cpufreq.c @@ -49,8 +49,6 @@ struct mtk_cpu_dvfs_info { bool need_voltage_tracking; int vproc_on_boot; int pre_vproc; - /* Avoid race condition for regulators between notify and policy */ - struct mutex reg_lock; struct notifier_block opp_nb; unsigned int opp_cpu; unsigned long current_freq; @@ -59,6 +57,9 @@ struct mtk_cpu_dvfs_info { bool ccifreq_bound; }; =20 +/* Avoid race condition for regulators between notify and policy */ +static DEFINE_MUTEX(mtk_policy_lock); + static struct platform_device *cpufreq_pdev; =20 static LIST_HEAD(dvfs_info_list); @@ -200,20 +201,29 @@ static bool is_ccifreq_ready(struct mtk_cpu_dvfs_info= *info) static int mtk_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index) { - struct cpufreq_frequency_table *freq_table =3D policy->freq_table; - struct clk *cpu_clk =3D policy->clk; - struct clk *armpll =3D clk_get_parent(cpu_clk); - struct mtk_cpu_dvfs_info *info =3D policy->driver_data; - struct device *cpu_dev =3D info->cpu_dev; + struct cpufreq_frequency_table *freq_table; + struct clk *cpu_clk; + struct clk *armpll; + struct mtk_cpu_dvfs_info *info; + struct device *cpu_dev; struct dev_pm_opp *opp; long freq_hz, pre_freq_hz; int vproc, pre_vproc, inter_vproc, target_vproc, ret; + struct cpufreq_freqs freqs; =20 - inter_vproc =3D info->intermediate_voltage; + mutex_lock(&mtk_policy_lock); =20 - pre_freq_hz =3D clk_get_rate(cpu_clk); + freq_table =3D policy->freq_table; + cpu_clk =3D policy->clk; + armpll =3D clk_get_parent(cpu_clk); + info =3D policy->driver_data; + cpu_dev =3D info->cpu_dev; + inter_vproc =3D info->intermediate_voltage; + pre_freq_hz =3D policy->cur * 1000; =20 - mutex_lock(&info->reg_lock); + freqs.old =3D policy->cur; + freqs.new =3D freq_table[index].frequency; + cpufreq_freq_transition_begin(policy, &freqs); =20 if (unlikely(info->pre_vproc <=3D 0)) pre_vproc =3D regulator_get_voltage(info->proc_reg); @@ -308,7 +318,8 @@ static int mtk_cpufreq_set_target(struct cpufreq_policy= *policy, info->current_freq =3D freq_hz; =20 out: - mutex_unlock(&info->reg_lock); + cpufreq_freq_transition_end(policy, &freqs, false); + mutex_unlock(&mtk_policy_lock); =20 return ret; } @@ -316,19 +327,20 @@ static int mtk_cpufreq_set_target(struct cpufreq_poli= cy *policy, static int mtk_cpufreq_opp_notifier(struct notifier_block *nb, unsigned long event, void *data) { - struct dev_pm_opp *opp =3D data; + struct dev_pm_opp *opp; struct dev_pm_opp *new_opp; struct mtk_cpu_dvfs_info *info; unsigned long freq, volt; struct cpufreq_policy *policy; int ret =3D 0; =20 + mutex_lock(&mtk_policy_lock); + opp =3D data; info =3D container_of(nb, struct mtk_cpu_dvfs_info, opp_nb); =20 if (event =3D=3D OPP_EVENT_ADJUST_VOLTAGE) { freq =3D dev_pm_opp_get_freq(opp); =20 - mutex_lock(&info->reg_lock); if (info->current_freq =3D=3D freq) { volt =3D dev_pm_opp_get_voltage(opp); ret =3D mtk_cpufreq_set_voltage(info, volt); @@ -336,7 +348,6 @@ static int mtk_cpufreq_opp_notifier(struct notifier_blo= ck *nb, dev_err(info->cpu_dev, "failed to scale voltage: %d\n", ret); } - mutex_unlock(&info->reg_lock); } else if (event =3D=3D OPP_EVENT_DISABLE) { freq =3D dev_pm_opp_get_freq(opp); =20 @@ -361,6 +372,7 @@ static int mtk_cpufreq_opp_notifier(struct notifier_blo= ck *nb, } } } + mutex_unlock(&mtk_policy_lock); =20 return notifier_from_errno(ret); } @@ -495,7 +507,6 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_i= nfo *info, int cpu) info->intermediate_voltage =3D dev_pm_opp_get_voltage(opp); dev_pm_opp_put(opp); =20 - mutex_init(&info->reg_lock); info->current_freq =3D clk_get_rate(info->cpu_clk); =20 info->opp_cpu =3D cpu; @@ -597,6 +608,9 @@ static int mtk_cpufreq_init(struct cpufreq_policy *poli= cy) policy->driver_data =3D info; policy->clk =3D info->cpu_clk; =20 + if (info->soc_data->ccifreq_supported) + policy->transition_delay_us =3D 10000; + return 0; } =20 @@ -607,13 +621,32 @@ static void mtk_cpufreq_exit(struct cpufreq_policy *p= olicy) dev_pm_opp_free_cpufreq_table(info->cpu_dev, &policy->freq_table); } =20 +static unsigned int mtk_cpufreq_get(unsigned int cpu) +{ + struct mtk_cpu_dvfs_info *info; + unsigned long current_freq; + + mutex_lock(&mtk_policy_lock); + info =3D mtk_cpu_dvfs_info_lookup(cpu); + if (!info) { + mutex_unlock(&mtk_policy_lock); + return 0; + } + + current_freq =3D info->current_freq / 1000; + mutex_unlock(&mtk_policy_lock); + + return current_freq; +} + static struct cpufreq_driver mtk_cpufreq_driver =3D { .flags =3D CPUFREQ_NEED_INITIAL_FREQ_CHECK | CPUFREQ_HAVE_GOVERNOR_PER_POLICY | + CPUFREQ_ASYNC_NOTIFICATION | CPUFREQ_IS_COOLING_DEV, .verify =3D cpufreq_generic_frequency_table_verify, .target_index =3D mtk_cpufreq_set_target, - .get =3D cpufreq_generic_get, + .get =3D mtk_cpufreq_get, .init =3D mtk_cpufreq_init, .exit =3D mtk_cpufreq_exit, .register_em =3D cpufreq_register_em_with_opp, --=20 2.45.2