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[88.156.142.67]) by smtp.gmail.com with ESMTPSA id c18-20020ac25f72000000b004b59b43ec61sm238491lfc.179.2022.12.16.06.58.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Dec 2022 06:58:07 -0800 (PST) From: Krzysztof Kozlowski To: "Rafael J. Wysocki" , Kevin Hilman , Ulf Hansson , Pavel Machek , Len Brown , Greg Kroah-Hartman , Daniel Lezcano , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Krzysztof Kozlowski , Adrien Thierry , Brian Masney Subject: [PATCH RFC 1/2] PM: domains: Add GENPD_FLAG_RT_SAFE for PREEMPT_RT Date: Fri, 16 Dec 2022 15:58:01 +0100 Message-Id: <20221216145802.102374-1-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1752383282907689626?= X-GMAIL-MSGID: =?utf-8?q?1752383282907689626?= Realtime kernels with PREEMPT_RT must use raw_spinlock_t, so add a flag allowing a power domain provider to indicate it is RT safe. The flag is supposed to be used with existing GENPD_FLAG_IRQ_SAFE. Cc: Adrien Thierry Cc: Brian Masney Signed-off-by: Krzysztof Kozlowski --- Independently from Adrien, I encountered the same problem around genpd when using PREEMPT_RT kernel. Previous patch by Adrien: https://lore.kernel.org/all/20220615203605.1068453-1-athierry@redhat.com/ --- drivers/base/power/domain.c | 51 +++++++++++++++++++++++++++++++++++-- include/linux/pm_domain.h | 13 ++++++++++ 2 files changed, 62 insertions(+), 2 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index a539d6bc6fe0..478862ae478a 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -119,6 +119,48 @@ static const struct genpd_lock_ops genpd_spin_ops = { .unlock = genpd_unlock_spin, }; +static void genpd_lock_rawspin(struct generic_pm_domain *genpd) + __acquires(&genpd->rslock) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&genpd->rslock, flags); + genpd->rlock_flags = flags; +} + +static void genpd_lock_nested_rawspin(struct generic_pm_domain *genpd, + int depth) + __acquires(&genpd->rslock) +{ + unsigned long flags; + + raw_spin_lock_irqsave_nested(&genpd->rslock, flags, depth); + genpd->rlock_flags = flags; +} + +static int genpd_lock_interruptible_rawspin(struct generic_pm_domain *genpd) + __acquires(&genpd->rslock) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&genpd->rslock, flags); + genpd->rlock_flags = flags; + return 0; +} + +static void genpd_unlock_rawspin(struct generic_pm_domain *genpd) + __releases(&genpd->rslock) +{ + raw_spin_unlock_irqrestore(&genpd->rslock, genpd->rlock_flags); +} + +static const struct genpd_lock_ops genpd_rawspin_ops = { + .lock = genpd_lock_rawspin, + .lock_nested = genpd_lock_nested_rawspin, + .lock_interruptible = genpd_lock_interruptible_rawspin, + .unlock = genpd_unlock_rawspin, +}; + #define genpd_lock(p) p->lock_ops->lock(p) #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) @@ -2048,8 +2090,13 @@ static void genpd_free_data(struct generic_pm_domain *genpd) static void genpd_lock_init(struct generic_pm_domain *genpd) { if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { - spin_lock_init(&genpd->slock); - genpd->lock_ops = &genpd_spin_ops; + if (genpd->flags & GENPD_FLAG_RT_SAFE) { + raw_spin_lock_init(&genpd->rslock); + genpd->lock_ops = &genpd_rawspin_ops; + } else { + spin_lock_init(&genpd->slock); + genpd->lock_ops = &genpd_spin_ops; + } } else { mutex_init(&genpd->mlock); genpd->lock_ops = &genpd_mtx_ops; diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index c6cda024ff99..6b0f9de2be1c 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -61,6 +61,14 @@ * GENPD_FLAG_MIN_RESIDENCY: Enable the genpd governor to consider its * components' next wakeup when determining the * optimal idle state. + * + * GENPD_FLAG_RT_SAFE: When used with GENPD_FLAG_IRQ_SAFE, this informs + * genpd that its backend callbacks, ->power_on|off(), + * do not use other spinlocks. They might use + * raw_spinlocks or other pre-emption-disable + * methods, all of which are PREEMPT_RT safe. Note + * that, a genpd having this flag set, requires its + * masterdomains to also have it set. */ #define GENPD_FLAG_PM_CLK (1U << 0) #define GENPD_FLAG_IRQ_SAFE (1U << 1) @@ -69,6 +77,7 @@ #define GENPD_FLAG_CPU_DOMAIN (1U << 4) #define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5) #define GENPD_FLAG_MIN_RESIDENCY (1U << 6) +#define GENPD_FLAG_RT_SAFE (1U << 7) enum gpd_status { GENPD_STATE_ON = 0, /* PM domain is on */ @@ -164,6 +173,10 @@ struct generic_pm_domain { spinlock_t slock; unsigned long lock_flags; }; + struct { + raw_spinlock_t rslock; + unsigned long rlock_flags; + }; }; }; From patchwork Fri Dec 16 14:58:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 33970 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:e747:0:0:0:0:0 with SMTP id c7csp1013479wrn; Fri, 16 Dec 2022 07:01:20 -0800 (PST) X-Google-Smtp-Source: AMrXdXsWJ2ZjUoYZS1g65Wr8tIa0ztflFpWUgS8GSAdrdqJNRxgeOAsNGv9FdxVoH7x2KTaq2q0v X-Received: by 2002:aa7:c850:0:b0:472:adc9:6eb2 with SMTP id g16-20020aa7c850000000b00472adc96eb2mr7633515edt.29.1671202880660; Fri, 16 Dec 2022 07:01:20 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1671202880; cv=none; d=google.com; s=arc-20160816; b=l6NGI9xYuz6QMmauqMFi0JXJQaEGcvHjqFTPcsVtCMa01RDSij0MISkB0PdedD2bVh hAqoMV78elt63E8c59wJtQk8nvIjAL9EWBXtZ9nEhL5Ev8jH3b8Q4BJDvl5Z4wH8GXOk mB8U+uYJx71TTqqoc8Uujpp+Rls9ad8vjXUKz6OO5H4RGjkM3JVesBZLAdhiHyJyPqKR JQ7Ri1HkYmJbKYn8idcdGa1J8EL5dmIMnPrAFfQfshhKR4sB/q63tOp2vdDICFyh61gH CsUDyUBLGbFNULz/kE+fygxoBxwWqgzI+nQlPeDFjIwCASIbQ9fn9ko1B9mi3kyROy1m YR2w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=XI5FWBUPx6OMJbv7hDR0vpuygKMiyn48qRmwgBRrpyg=; b=HYluxs79V1o/eqJ2xpHvB0vOIu1K/OYX143+YbQ1fCKLC9jD7UHqeZlkpQAimPO0mM fnQWZod/ctYgs4Jm3txlZ0nhdK41yOBc2AWfiM4ihafF+VclCvwPfJNu+I7YPEQhzMIk 3Pm6eFjzBGUjalngGUXZh64TqIklRqZVRq/G8t5SjPfU34AaqZpnB8M753asKwk4+98X QB42Xvd4oAXDtiBbAY7zTaoY+Z8p9VKrJy45nHua2ynDT8FB8EV4lehLAYJvkYsSiBAt rExkLVnfCdGrighl677h0tCkgIjDIgCkeXzEiJT+vM5iTa+ebG4ReJZUs4hyXbkyvNQa lHCA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b="EjIV/9MO"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from out1.vger.email (out1.vger.email. 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[88.156.142.67]) by smtp.gmail.com with ESMTPSA id c18-20020ac25f72000000b004b59b43ec61sm238491lfc.179.2022.12.16.06.58.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Dec 2022 06:58:08 -0800 (PST) From: Krzysztof Kozlowski To: "Rafael J. Wysocki" , Kevin Hilman , Ulf Hansson , Pavel Machek , Len Brown , Greg Kroah-Hartman , Daniel Lezcano , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Krzysztof Kozlowski , Adrien Thierry , Brian Masney Subject: [PATCH RFC 2/2] cpuidle: psci: Mark as PREEMPT_RT safe Date: Fri, 16 Dec 2022 15:58:02 +0100 Message-Id: <20221216145802.102374-2-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221216145802.102374-1-krzysztof.kozlowski@linaro.org> References: <20221216145802.102374-1-krzysztof.kozlowski@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1752383232008778827?= X-GMAIL-MSGID: =?utf-8?q?1752383232008778827?= The PSCI cpuidle power domain in power_off callback uses __this_cpu_write() so it is PREEMPT_RT safe. This allows to use it in Realtime kernels and solves errors like: BUG: scheduling while atomic: swapper/2/0/0x00000002 Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT) Call trace: dump_backtrace.part.0+0xe0/0xf0 show_stack+0x18/0x40 dump_stack_lvl+0x68/0x84 dump_stack+0x18/0x34 __schedule_bug+0x60/0x80 __schedule+0x628/0x800 schedule_rtlock+0x28/0x5c rtlock_slowlock_locked+0x360/0xd30 rt_spin_lock+0x88/0xb0 genpd_lock_nested_spin+0x1c/0x30 genpd_power_off.part.0.isra.0+0x20c/0x2a0 genpd_runtime_suspend+0x150/0x2bc __rpm_callback+0x48/0x170 rpm_callback+0x6c/0x7c rpm_suspend+0x108/0x660 __pm_runtime_suspend+0x4c/0x8c __psci_enter_domain_idle_state.constprop.0+0x54/0xe0 psci_enter_domain_idle_state+0x18/0x2c cpuidle_enter_state+0x8c/0x4e0 cpuidle_enter+0x38/0x50 do_idle+0x248/0x2f0 cpu_startup_entry+0x24/0x30 secondary_start_kernel+0x130/0x154 __secondary_switched+0xb0/0xb4 Cc: Adrien Thierry Cc: Brian Masney Signed-off-by: Krzysztof Kozlowski --- drivers/cpuidle/cpuidle-psci-domain.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c index 821984947ed9..5cb78e754b27 100644 --- a/drivers/cpuidle/cpuidle-psci-domain.c +++ b/drivers/cpuidle/cpuidle-psci-domain.c @@ -62,7 +62,8 @@ static int psci_pd_init(struct device_node *np, bool use_osi) if (!pd_provider) goto free_pd; - pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN; + pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_RT_SAFE | \ + GENPD_FLAG_CPU_DOMAIN; /* Allow power off when OSI has been successfully enabled. */ if (use_osi)