From patchwork Wed Jan 25 11:34:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 647457 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 5C25BC54E94 for ; Wed, 25 Jan 2023 11:34:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235018AbjAYLer (ORCPT ); Wed, 25 Jan 2023 06:34:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53248 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235607AbjAYLe0 (ORCPT ); Wed, 25 Jan 2023 06:34:26 -0500 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F075D15C82 for ; Wed, 25 Jan 2023 03:34:24 -0800 (PST) Received: by mail-wr1-x42f.google.com with SMTP id m7so3073335wru.8 for ; Wed, 25 Jan 2023 03:34:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=6QYojRCCtYlJhvbj3M9r4VzNWk15cQ6A9mCCL7h6cqs=; b=tM3TcsMUWq0ATsaki5PPF59y/iPtsRn3LI8ChlBOT16wCaHLeLiTV8DDwyuI3Hukcz MaR6lSYLCjvFoAPegdg4pLiIMAWFdk9D8O0JmNrmuKsOZvjuyvolpxaCzTi5QUoZs6BP JW/tDHKxFwyGtgkGpqFpi/HNOK8tDPn2YBfWGWJ4T8rFcLptFgdka6NgIcF2V0xWR02h VWcoQ+d+32zt7qWfr5WNeLWNwUCFe7ahUbVXTK4pgD70W1FK6tu7ObQ1h9P7MhKGXqvM CxPmI+QKnUF9DELrMsqsjFJtUZ9XR+qtZQ5d1X6hmSMee1vDsSKxSjj7fJNR3ukkC9Or gXfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=6QYojRCCtYlJhvbj3M9r4VzNWk15cQ6A9mCCL7h6cqs=; b=Bql7aQM94VxWvfu20sYX/px9+GGZpFjnkdLA29q4p9b6S6IUmSKTQY7+Mdztp1ryDJ bKcCo6GPdIIXCpPf1fMVvMYMRCFZp1vN2DQXa9ip2l/jr/f/GLAZVMj2z4hZ3NemAgWh q7w5asHmgUVNY5hHFv8fl1AnDI3qRt9AiMOvn8Tl0sRYLckLZCDrczH42N7ol+6kRbP9 kJUMRA6fx4VCcSuD8U/gh1HVN58XPmn+qXkNaRgRS+JbmHaVfcZzFrQzQqQzstB7xmLX 9L7VcqZ5Qhkev4ztrhom15oOl1CsDwWBT9xfobTzezOIREw5yuqADeb9WLBJEkwHff4P /vQw== X-Gm-Message-State: AO0yUKUNnyS0p2gvE+s0vLLEb0sxK4hsDXDUzNPTU9hJ8oCwdJ0p+Xvv zB2wJutlsCW205JQi98LMY0DuQ== X-Google-Smtp-Source: AK7set9VpIH0D3BN4cRVxVqYN7JNRSMgys2I74WBhgAJEIQBNvqfmyMUGW9z20vMf24lhEQK0WRgNg== X-Received: by 2002:adf:dd12:0:b0:2bf:afdf:13db with SMTP id a18-20020adfdd12000000b002bfafdf13dbmr4795182wrm.47.1674646463364; Wed, 25 Jan 2023 03:34:23 -0800 (PST) Received: from krzk-bin.. ([178.197.216.144]) by smtp.gmail.com with ESMTPSA id s18-20020a5d4ed2000000b002bde537721dsm4213759wrv.20.2023.01.25.03.34.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Jan 2023 03:34:23 -0800 (PST) From: Krzysztof Kozlowski To: "Rafael J. Wysocki" , Daniel Lezcano , Ulf Hansson , Lorenzo Pieralisi , Sudeep Holla , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Krzysztof Kozlowski , Adrien Thierry , Brian Masney , linux-rt-users@vger.kernel.org Subject: [PATCH v4] cpuidle: psci: Do not suspend topology CPUs on PREEMPT_RT Date: Wed, 25 Jan 2023 12:34:18 +0100 Message-Id: <20230125113418.455089-1-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org The runtime Power Management of CPU topology is not compatible with PREEMPT_RT: 1. Core cpuidle path disables IRQs. 2. Core cpuidle calls cpuidle-psci. 3. cpuidle-psci in __psci_enter_domain_idle_state() calls pm_runtime_put_sync_suspend() and pm_runtime_get_sync() which use spinlocks (which are sleeping on PREEMPT_RT). Deep sleep modes are not a priority of Realtime kernels because the latencies might become unpredictable. On the other hand the PSCI CPU idle power domain is a parent of other devices and power domain controllers, thus it cannot be simply skipped (e.g. on Qualcomm SM8250). Disable the idle callbacks in cpuidle-psci and mark the domain as always on. This is a trade-off between making PREEMPT_RT working and still having a proper power domain hierarchy in the system. Cc: Adrien Thierry Cc: Brian Masney Cc: linux-rt-users@vger.kernel.org Signed-off-by: Krzysztof Kozlowski Tested-by: Adrien Thierry --- Changes since v3: 1. Rework - disable idle states, mark as always on (Ulf). 2. Extend Kconfig warning (Ulf). Changes since v1: 1. Re-work commit msg. 2. Add note to Kconfig. Several other patches were dropped, as this is the only one actually needed. It effectively stops PSCI cpuidle power domains from suspending thus solving all other issues I experienced. --- drivers/cpuidle/Kconfig.arm | 8 ++++++++ drivers/cpuidle/cpuidle-psci-domain.c | 7 +++++-- drivers/cpuidle/cpuidle-psci.c | 3 +++ 3 files changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm index 747aa537389b..8deaa2e05206 100644 --- a/drivers/cpuidle/Kconfig.arm +++ b/drivers/cpuidle/Kconfig.arm @@ -24,6 +24,14 @@ config ARM_PSCI_CPUIDLE It provides an idle driver that is capable of detecting and managing idle states through the PSCI firmware interface. + The driver has limitations when used with PREEMPT_RT: + - If the idle states are described with the non-hierarchical layout, + all idle states are still available. + + - If the idle states are described with the hierarchical layout, + only the idle states defined per CPU are available, but not the ones + being shared among a group of CPUs (aka cluster idle states). + config ARM_PSCI_CPUIDLE_DOMAIN bool "PSCI CPU idle Domain" depends on ARM_PSCI_CPUIDLE diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c index c80cf9ddabd8..6ad2954948a5 100644 --- a/drivers/cpuidle/cpuidle-psci-domain.c +++ b/drivers/cpuidle/cpuidle-psci-domain.c @@ -64,8 +64,11 @@ static int psci_pd_init(struct device_node *np, bool use_osi) pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN; - /* Allow power off when OSI has been successfully enabled. */ - if (use_osi) + /* + * Allow power off when OSI has been successfully enabled. + * PREEMPT_RT is not yet ready to enter domain idle states. + */ + if (use_osi && !IS_ENABLED(CONFIG_PREEMPT_RT)) pd->power_off = psci_pd_power_off; else pd->flags |= GENPD_FLAG_ALWAYS_ON; diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c index 312a34ef28dc..6de027f9f6f5 100644 --- a/drivers/cpuidle/cpuidle-psci.c +++ b/drivers/cpuidle/cpuidle-psci.c @@ -222,6 +222,9 @@ static int psci_dt_cpu_init_topology(struct cpuidle_driver *drv, if (!psci_has_osi_support()) return 0; + if (IS_ENABLED(CONFIG_PREEMPT_RT)) + return 0; + data->dev = psci_dt_attach_cpu(cpu); if (IS_ERR_OR_NULL(data->dev)) return PTR_ERR_OR_ZERO(data->dev);