From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org>, Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Kevin Hilman <khilman@kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>, Daniel Lezcano <daniel.lezcano@linaro.org>, Lorenzo Pieralisi <lpieralisi@kernel.org>, Sudeep Holla <sudeep.holla@arm.com>, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Adrien Thierry <athierry@redhat.com>, Brian Masney <bmasney@redhat.com>, linux-rt-users@vger.kernel.org Subject: Re: [PATCH v2 3/5] cpuidle: psci: Do not suspend topology CPUs on PREEMPT_RT Date: Thu, 12 Jan 2023 12:09:24 +0100 [thread overview] Message-ID: <Y7/qZNoXvp/I6h8s@linutronix.de> (raw) In-Reply-To: <20221219151503.385816-4-krzysztof.kozlowski@linaro.org> On 2022-12-19 16:15:01 [+0100], Krzysztof Kozlowski wrote: > diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c > index 57bc3e3ae391..9d971cc4b12b 100644 > --- a/drivers/cpuidle/cpuidle-psci.c > +++ b/drivers/cpuidle/cpuidle-psci.c > @@ -72,7 +72,7 @@ static int __psci_enter_domain_idle_state(struct cpuidle_device *dev, > ct_irq_enter_irqson(); > if (s2idle) > dev_pm_genpd_suspend(pd_dev); > - else > + else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) > pm_runtime_put_sync_suspend(pd_dev); So based on the commit description you run into a sleeping lock in pm_runtime_put_sync_suspend() while the CPU is in an IRQ-off region. Why is it okay to skip it on PREEMPT_RT? > ct_irq_exit_irqson(); > Sebastian _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org>, Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Kevin Hilman <khilman@kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>, Daniel Lezcano <daniel.lezcano@linaro.org>, Lorenzo Pieralisi <lpieralisi@kernel.org>, Sudeep Holla <sudeep.holla@arm.com>, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Adrien Thierry <athierry@redhat.com>, Brian Masney <bmasney@redhat.com>, linux-rt-users@vger.kernel.org Subject: Re: [PATCH v2 3/5] cpuidle: psci: Do not suspend topology CPUs on PREEMPT_RT Date: Thu, 12 Jan 2023 12:09:24 +0100 [thread overview] Message-ID: <Y7/qZNoXvp/I6h8s@linutronix.de> (raw) In-Reply-To: <20221219151503.385816-4-krzysztof.kozlowski@linaro.org> On 2022-12-19 16:15:01 [+0100], Krzysztof Kozlowski wrote: > diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c > index 57bc3e3ae391..9d971cc4b12b 100644 > --- a/drivers/cpuidle/cpuidle-psci.c > +++ b/drivers/cpuidle/cpuidle-psci.c > @@ -72,7 +72,7 @@ static int __psci_enter_domain_idle_state(struct cpuidle_device *dev, > ct_irq_enter_irqson(); > if (s2idle) > dev_pm_genpd_suspend(pd_dev); > - else > + else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) > pm_runtime_put_sync_suspend(pd_dev); So based on the commit description you run into a sleeping lock in pm_runtime_put_sync_suspend() while the CPU is in an IRQ-off region. Why is it okay to skip it on PREEMPT_RT? > ct_irq_exit_irqson(); > Sebastian
next prev parent reply other threads:[~2023-01-12 11:10 UTC|newest] Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-12-19 15:14 [PATCH v2 0/5] PM: Fixes for Realtime systems Krzysztof Kozlowski 2022-12-19 15:14 ` Krzysztof Kozlowski 2022-12-19 15:14 ` [PATCH v2 1/5] PM: domains: Add GENPD_FLAG_RT_SAFE for PREEMPT_RT Krzysztof Kozlowski 2022-12-19 15:14 ` Krzysztof Kozlowski 2023-01-04 15:45 ` Ulf Hansson 2023-01-04 15:45 ` Ulf Hansson 2023-01-06 14:52 ` Krzysztof Kozlowski 2023-01-06 14:52 ` Krzysztof Kozlowski 2023-01-12 10:36 ` Sebastian Andrzej Siewior 2023-01-12 10:36 ` Sebastian Andrzej Siewior 2023-01-12 11:27 ` Krzysztof Kozlowski 2023-01-12 11:27 ` Krzysztof Kozlowski 2023-01-12 10:32 ` Sebastian Andrzej Siewior 2023-01-12 10:32 ` Sebastian Andrzej Siewior 2023-01-12 11:31 ` Krzysztof Kozlowski 2023-01-12 11:31 ` Krzysztof Kozlowski 2022-12-19 15:15 ` [PATCH v2 2/5] cpuidle: psci: Mark as PREEMPT_RT safe Krzysztof Kozlowski 2022-12-19 15:15 ` Krzysztof Kozlowski 2023-01-12 11:00 ` Sebastian Andrzej Siewior 2023-01-12 11:00 ` Sebastian Andrzej Siewior 2023-01-12 11:32 ` Krzysztof Kozlowski 2023-01-12 11:32 ` Krzysztof Kozlowski 2023-01-17 15:27 ` Ulf Hansson 2023-01-17 15:27 ` Ulf Hansson 2023-01-19 15:40 ` Krzysztof Kozlowski 2023-01-19 15:40 ` Krzysztof Kozlowski 2023-01-19 17:06 ` Krzysztof Kozlowski 2023-01-19 17:06 ` Krzysztof Kozlowski 2022-12-19 15:15 ` [PATCH v2 3/5] cpuidle: psci: Do not suspend topology CPUs on PREEMPT_RT Krzysztof Kozlowski 2022-12-19 15:15 ` Krzysztof Kozlowski 2023-01-12 11:09 ` Sebastian Andrzej Siewior [this message] 2023-01-12 11:09 ` Sebastian Andrzej Siewior 2023-01-12 11:34 ` Krzysztof Kozlowski 2023-01-12 11:34 ` Krzysztof Kozlowski 2023-01-30 9:51 ` Sebastian Andrzej Siewior 2023-01-30 9:51 ` Sebastian Andrzej Siewior 2022-12-19 15:15 ` [PATCH v2 4/5] PM: Allow calling dev_pm_domain_set() with raw spinlock Krzysztof Kozlowski 2022-12-19 15:15 ` Krzysztof Kozlowski 2023-01-12 11:13 ` Sebastian Andrzej Siewior 2023-01-12 11:13 ` Sebastian Andrzej Siewior 2022-12-19 15:15 ` [PATCH v2 5/5] PM: domains: Do not call device_pm_check_callbacks() when holding genpd_lock() Krzysztof Kozlowski 2022-12-19 15:15 ` Krzysztof Kozlowski 2023-01-12 11:31 ` Sebastian Andrzej Siewior 2023-01-12 11:31 ` Sebastian Andrzej Siewior 2023-01-12 11:37 ` Krzysztof Kozlowski 2023-01-12 11:37 ` Krzysztof Kozlowski 2023-01-17 15:11 ` Ulf Hansson 2023-01-17 15:11 ` Ulf Hansson 2023-01-19 15:58 ` Krzysztof Kozlowski 2023-01-19 15:58 ` Krzysztof Kozlowski 2022-12-20 21:36 ` [PATCH v2 0/5] PM: Fixes for Realtime systems Adrien Thierry 2022-12-20 21:36 ` Adrien Thierry 2023-01-04 15:15 ` Ulf Hansson 2023-01-04 15:15 ` Ulf Hansson
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