From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A5F87C04AA7 for ; Mon, 13 May 2019 19:29:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 762F520850 for ; Mon, 13 May 2019 19:29:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="sPy1xWva" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727081AbfEMT3X (ORCPT ); Mon, 13 May 2019 15:29:23 -0400 Received: from mail-lj1-f193.google.com ([209.85.208.193]:42300 "EHLO mail-lj1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726570AbfEMT3W (ORCPT ); Mon, 13 May 2019 15:29:22 -0400 Received: by mail-lj1-f193.google.com with SMTP id 188so12073211ljf.9 for ; Mon, 13 May 2019 12:29:20 -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; bh=WrUBlQWQzfbgrdk7klxniFTaW91XaiQj55o38mlFd9s=; b=sPy1xWvat53hABQ29ElA2SDvZnqfRV5oZCv6u9/BoxR2ZPqFXvyAG3a5TqRkJY1a78 ViroHIx+ON0jQRU/3UrEYHgnwsRgfEfK1eI6rvzBvxBl01A+l0VD3RNQr/pCLeiGgll5 oZk8WImmrSosBLIL5WDY5HKxk6DoQYAY3hOyay9Zaekc0Qx48OBqfoEIU9LOQbcuUzO9 y21fdWLhr9sVngZjVbZUtziI2z+WwnXK05qOJ7jaN6FqE68r4gmG+pebrx9IRchSta0X VzfAclg9EtvAhwIfrDB0k8yyetyh5giqMkUfQdSjeFYl6oWMRIbrHygy50HEN/rtT2Ov JANw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=WrUBlQWQzfbgrdk7klxniFTaW91XaiQj55o38mlFd9s=; b=G5Qo5nnuwnGMsBD/pLHISnMhXm2aBYWSsnkiTuYuh59RzS7WD89Cax2FIiIkOob2MF +Xg6bgwXUiYkCtv2pYNr5Mh04pp51g/o7NmKPv+gPzphzu1nWvyF9pdw+03sHuT9sFnW kV03ymKjI0b+OWW1TiQ74nXPXnEV5a7NP+kezdJLgI29RjTskYRMCYfM2lcuB8nKoGkG 5ECyy3PjVOIHxg/UGdZGUQGm9GXHzsVAKbU+vsj+J7lTLenO7WrRvNO2YmTSVTc90w4D qYpXM30B86bVf6gR+TSRlhPdtFFSLysK3eT95kZ3BPg10LkWucfd8ySNm9Ev4bW6abxd zXKQ== X-Gm-Message-State: APjAAAUCTNxet8ldg69pbBbnEhgn/SPldg03ijSqczGZuxy5XJ3poZTD XstagjnNP6ff0ja8lKKR4OvKSw== X-Google-Smtp-Source: APXvYqwd8hFjFHeIWZMZf2tJMuRrNt9YuVmMQEmung/qTBri+UbFr4ziejpMmn/ZiqWmeUdPeQNSbw== X-Received: by 2002:a2e:2b58:: with SMTP id q85mr14768159lje.179.1557775413538; Mon, 13 May 2019 12:23:33 -0700 (PDT) Received: from localhost.localdomain (h-158-174-22-210.NA.cust.bahnhof.se. [158.174.22.210]) by smtp.gmail.com with ESMTPSA id q21sm3449365lfa.84.2019.05.13.12.23.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 May 2019 12:23:32 -0700 (PDT) From: Ulf Hansson To: Sudeep Holla , Lorenzo Pieralisi , Mark Rutland , linux-arm-kernel@lists.infradead.org Cc: "Rafael J . Wysocki" , Daniel Lezcano , "Raju P . L . S . S . S . N" , Amit Kucheria , Bjorn Andersson , Stephen Boyd , Niklas Cassel , Tony Lindgren , Kevin Hilman , Lina Iyer , Viresh Kumar , Vincent Guittot , Geert Uytterhoeven , Souvik Chakravarty , linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Ulf Hansson Subject: [PATCH 15/18] drivers: firmware: psci: Support CPU hotplug for the hierarchical model Date: Mon, 13 May 2019 21:22:57 +0200 Message-Id: <20190513192300.653-16-ulf.hansson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190513192300.653-1-ulf.hansson@linaro.org> References: <20190513192300.653-1-ulf.hansson@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org When the hierarchical CPU topology is used and when a CPU has been put offline (hotplug), that same CPU prevents its PM domain and thus also potential master PM domains, from being powered off. This is because genpd observes the CPU's attached device as being active from a runtime PM point of view. To deal with this, let's decrease the runtime PM usage count by calling pm_runtime_put_sync_suspend() of the attached struct device when putting the CPU offline. Consequentially, we must then increase the runtime PM usage count, while putting the CPU online again. Signed-off-by: Ulf Hansson --- Changes: - Use get_logical_index() to find the CPU number. - Verify that a corresponding struct device* has been attached to the PM domain before doing runtime PM refrence counting. - Clear the domain state when the CPU goes offline, to start fresh. - Move code to internal helper functions and move them inside "ifdef CONFIG_CPU_IDLE. --- drivers/firmware/psci/psci.c | 47 +++++++++++++++++++++++++++++++++++- 1 file changed, 46 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c index 2c4157d3a616..5ad93c3694b5 100644 --- a/drivers/firmware/psci/psci.c +++ b/drivers/firmware/psci/psci.c @@ -15,6 +15,7 @@ #include #include +#include #include #include #include @@ -93,6 +94,9 @@ static u32 psci_function_id[PSCI_FN_MAX]; static u32 psci_cpu_suspend_feature; static bool psci_system_reset2_supported; +static void psci_cpuidle_cpu_off(void); +static void psci_cpuidle_cpu_on(unsigned long cpuid); + static inline bool psci_has_ext_power_state(void) { return psci_cpu_suspend_feature & @@ -188,6 +192,8 @@ static int psci_cpu_off(u32 state) int err; u32 fn; + psci_cpuidle_cpu_off(); + fn = psci_function_id[PSCI_FN_CPU_OFF]; err = invoke_psci_fn(fn, state, 0, 0); return psci_to_linux_errno(err); @@ -200,7 +206,13 @@ static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point) fn = psci_function_id[PSCI_FN_CPU_ON]; err = invoke_psci_fn(fn, cpuid, entry_point, 0); - return psci_to_linux_errno(err); + err = psci_to_linux_errno(err); + if (err) + return err; + + psci_cpuidle_cpu_on(cpuid); + + return 0; } static int psci_migrate(unsigned long cpuid) @@ -540,8 +552,41 @@ static int __init _psci_dt_topology_init(struct device_node *np) return ret; } + +static void psci_cpuidle_cpu_off(void) +{ + struct device *dev = __this_cpu_read(psci_cpuidle_data.dev); + + /* + * Drop the runtime PM usage count if the CPU has been attached to a + * CPU PM domain. This is needed to, for example, not prevent other + * master domains in the hierarchy to remain powered on. + */ + if (dev) + pm_runtime_put_sync_suspend(dev); +} + +static void psci_cpuidle_cpu_on(unsigned long cpuid) +{ + struct device *dev; + int cpu; + + if (!psci_dt_topology) + return; + + cpu = get_logical_index(cpuid); + if (cpu < 0) + return; + + dev = per_cpu(psci_cpuidle_data.dev, cpu); + if (dev) + pm_runtime_get_sync(dev); +} + #else static inline int _psci_dt_topology_init(struct device_node *np) { return 0; } +static void psci_cpuidle_cpu_off(void) {} +static void psci_cpuidle_cpu_on(unsigned long cpuid) {} #endif static int psci_system_suspend(unsigned long unused) -- 2.17.1