From patchwork Sat Mar 26 15:51:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 555484 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8783CC4332F for ; Sat, 26 Mar 2022 15:52:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233688AbiCZPxh (ORCPT ); Sat, 26 Mar 2022 11:53:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233689AbiCZPxg (ORCPT ); Sat, 26 Mar 2022 11:53:36 -0400 Received: from mail-lf1-x131.google.com (mail-lf1-x131.google.com [IPv6:2a00:1450:4864:20::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2950412ACE for ; Sat, 26 Mar 2022 08:51:59 -0700 (PDT) Received: by mail-lf1-x131.google.com with SMTP id bt26so17998319lfb.3 for ; Sat, 26 Mar 2022 08:51:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=TGuxe1tdDb+vQ+pZhLOcPKE6MxLU7K+4INF2UgDIqr0=; b=Yqxt27hEZ4enS/Hz6DvVZIsJpD5jySXI/e+r7/MOZUXw7X2toawJ6gPkF4TsGR3Gj1 kchL8DLZ1X0/YYlmaiOXXcVYTZb7l1nNi5oqxXRa+1ZW5LdCsdGejIX053syZqtEVRkw mYAEC5yK6oXL+oTkClsIQmPEgKGxRd0oFvh1U9HJqy27CLJHAhArRROfhUE8kDYu9iRV NPIvECa9yxV7+wCsywlYIMY7a5oVkbSDgQZkVPoINNGZDkr3wLM/qpM2m/LMXOuD292G dHNxvQ1HZwUyUpITpkb69yxI6BXO7lSGN4kWWGKFh/8KhlUOQ3KeNQAfqRGezQsZflzK xtqw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=TGuxe1tdDb+vQ+pZhLOcPKE6MxLU7K+4INF2UgDIqr0=; b=QJP2raigIFX5c7eWnDAiymPvQgviwYgyXPCo5nxcNHiLBOnd3/sAx3q6bNn2/bpIr/ WUQttPpimoIDpNdanVXCXnPRRjUkmM+68pg/8QjwGLkvNS0pypOZxCcJS6fo+th0/tlV OkJMF3zbANsoDqwaOEF3RZTVmIMM/SxUBGK6G7AFvN/ZKdWxDdXUqVefiKHKTMSNSaou xO1cO37YP2/INkfUuQxNVWXy9fPIAmAtgit0KgA/5CzLT7U3Qe5ySTzZlpF79K1Zrz6c 0h8fr12SBav3xS9m2TPAleUl8f0qusUKMp7tx3V6cUKx64gS0A6fre6QpHcm3DTDn69P O+Tw== X-Gm-Message-State: AOAM533tI172YK2ysDSsSoS9xuLmeXtV96FRBvtOEUbi6QwKv5rr3LhD Vx/PEnUHAsurPDfYEKLwqxeThfGec2cBhg== X-Google-Smtp-Source: ABdhPJx6FgKKfA7Gsm5qoa96fp4hyxULZ36tI15uJ/iTrrlmOi/3LS+TS0iR//A1d69nPukRK8VQjw== X-Received: by 2002:ac2:5223:0:b0:448:5100:e427 with SMTP id i3-20020ac25223000000b004485100e427mr12565757lfl.87.1648309917316; Sat, 26 Mar 2022 08:51:57 -0700 (PDT) Received: from eriador.lumag.spb.ru ([185.24.52.156]) by smtp.gmail.com with ESMTPSA id o17-20020a05651238b100b00443c898b598sm1097992lft.112.2022.03.26.08.51.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Mar 2022 08:51:56 -0700 (PDT) From: Dmitry Baryshkov To: Andy Gross , Bjorn Andersson , "Rafael J. Wysocki" , Viresh Kumar Cc: linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, Thara Gopinath Subject: [PATCH v4 2/4] cpufreq: qcom-hw: fix the race between LMH worker and cpuhp Date: Sat, 26 Mar 2022 18:51:51 +0300 Message-Id: <20220326155153.7377-3-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220326155153.7377-1-dmitry.baryshkov@linaro.org> References: <20220326155153.7377-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The driver would disable the worker when cpu is being put offline, but it happens closer to the end of cpufreq_offline(). The function qcom_lmh_dcvs_poll() can be running in parallel with this, when policy->cpus already has been updated. Read policy->related_cpus instead. [ 37.122433] ------------[ cut here ]------------ [ 37.127225] WARNING: CPU: 0 PID: 187 at drivers/base/arch_topology.c:180 topology_update_thermal_pressure+0xec/0x100 [ 37.138098] Modules linked in: [ 37.141279] CPU: 0 PID: 187 Comm: kworker/0:3 Tainted: G S 5.17.0-rc6-00389-g37c83d0b8710-dirty #713 [ 37.158306] Workqueue: events qcom_lmh_dcvs_poll [ 37.163095] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 37.170278] pc : topology_update_thermal_pressure+0xec/0x100 [ 37.176131] lr : topology_update_thermal_pressure+0x20/0x100 [ 37.181977] sp : ffff800009b6bce0 [ 37.185402] x29: ffff800009b6bce0 x28: ffffd87abe92b000 x27: ffff04bd7292e205 [ 37.192792] x26: ffffd87abe930af8 x25: ffffd87abe94e4c8 x24: 0000000000000000 [ 37.200180] x23: ffff04bb01177018 x22: ffff04bb011770c0 x21: ffff04bb01177000 [ 37.207567] x20: ffff04bb0a419000 x19: 00000000000c4e00 x18: 0000000000000000 [ 37.214954] x17: 000000040044ffff x16: 004000b2b5503510 x15: 0000006aaa1326d2 [ 37.222333] x14: 0000000000000232 x13: 0000000000000001 x12: 0000000000000040 [ 37.229718] x11: ffff04bb00400000 x10: 968f57bd39f701c8 x9 : ffff04bb0acc8674 [ 37.237095] x8 : fefefefefefefeff x7 : 0000000000000018 x6 : ffffd87abd90092c [ 37.244478] x5 : 0000000000000016 x4 : 0000000000000000 x3 : 0000000000000100 [ 37.251852] x2 : ffff04bb0a419020 x1 : 0000000000000100 x0 : 0000000000000100 [ 37.259235] Call trace: [ 37.261771] topology_update_thermal_pressure+0xec/0x100 [ 37.267266] qcom_lmh_dcvs_poll+0xbc/0x154 [ 37.271505] process_one_work+0x288/0x69c [ 37.275654] worker_thread+0x74/0x470 [ 37.279450] kthread+0xfc/0x100 [ 37.282712] ret_from_fork+0x10/0x20 [ 37.286417] irq event stamp: 74 [ 37.289664] hardirqs last enabled at (73): [] _raw_spin_unlock_irq+0x44/0x80 [ 37.298632] hardirqs last disabled at (74): [] __schedule+0x710/0xa10 [ 37.306885] softirqs last enabled at (58): [] _stext+0x410/0x588 [ 37.314778] softirqs last disabled at (51): [] __irq_exit_rcu+0x158/0x174 [ 37.323386] ---[ end trace 0000000000000000 ]--- Fixes: 275157b367f4 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support") Signed-off-by: Dmitry Baryshkov --- drivers/cpufreq/qcom-cpufreq-hw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index 44d46e52baea..d39a0ef9ea45 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -290,7 +290,7 @@ static unsigned int qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data) static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) { struct cpufreq_policy *policy = data->policy; - int cpu = cpumask_first(policy->cpus); + int cpu = cpumask_first(policy->related_cpus); struct device *dev = get_cpu_device(cpu); unsigned long freq_hz, throttled_freq; struct dev_pm_opp *opp;