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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E419C54EE9 for ; Mon, 19 Sep 2022 15:03:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229694AbiISPDt (ORCPT ); Mon, 19 Sep 2022 11:03:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50064 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229578AbiISPDo (ORCPT ); Mon, 19 Sep 2022 11:03:44 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3167032DBC for ; Mon, 19 Sep 2022 08:03:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=8W4ANpZZg81bkZotlJvZ4fg4qiAvSnY5PZyc1BTsWP4=; b=TgoDTVhWtKioMAysMtRZaz+Ed4 3iL0je6K5Ai9n6tiQwv/cwXv6NOP0BwrMkHno/osPxg/RShHq5xAhp+fMX5Yy1LaTFzQyD2PKiDDa IDcRLh7Ei/snb4+/2+Rx+mnplXAYQmJsQxndGbb/87NfjvASOxocT/vko3Dsiv0YDdWBWm40GCYOU BqfYSOsgVZdJmPddNOZCBOqDrZGRZ7l78tr1pd1q85g8jMuq2dLOS9jwOybdzQXTlcFirzTSFh1Mf CwHwwRhI7n9Qk6BduqR2uRJ2T8bbcCN4Pdh8GIPZSoE0DqIl0HQ8n6rVimdaBjWyxLbUZ/OLSG7Cy vJU3fjyg==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1oaIId-004nY8-EL; Mon, 19 Sep 2022 15:03:07 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 86D5B30035F; Mon, 19 Sep 2022 17:03:04 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 5DBEE2BAC7A31; Mon, 19 Sep 2022 17:03:04 +0200 (CEST) Date: Mon, 19 Sep 2022 17:03:04 +0200 From: Peter Zijlstra To: Frederic Weisbecker Cc: richard.henderson@linaro.org, ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@kernel.org, linux@armlinux.org.uk, ulli.kroll@googlemail.com, linus.walleij@linaro.org, shawnguo@kernel.org, Sascha Hauer , kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, tony@atomide.com, khilman@kernel.org, catalin.marinas@arm.com, will@kernel.org, guoren@kernel.org, bcain@quicinc.com, chenhuacai@kernel.org, kernel@xen0n.name, geert@linux-m68k.org, sammy@sammy.net, monstr@monstr.eu, tsbogend@alpha.franken.de, dinguyen@kernel.org, jonas@southpole.se, stefan.kristiansson@saunalahti.fi, shorne@gmail.com, James.Bottomley@hansenpartnership.com, deller@gmx.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org, davem@davemloft.net, richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, namhyung@kernel.org, jgross@suse.com, srivatsa@csail.mit.edu, amakhalov@vmware.com, pv-drivers@vmware.com, boris.ostrovsky@oracle.com, chris@zankel.net, jcmvbkbc@gmail.com, rafael@kernel.org, lenb@kernel.org, pavel@ucw.cz, gregkh@linuxfoundation.org, mturquette@baylibre.com, sboyd@kernel.org, daniel.lezcano@linaro.org, lpieralisi@kernel.org, sudeep.holla@arm.com, agross@kernel.org, bjorn.andersson@linaro.org, konrad.dybcio@somainline.org, anup@brainfault.org, thierry.reding@gmail.com, jonathanh@nvidia.com, jacob.jun.pan@linux.intel.com, atishp@atishpatra.org, Arnd Bergmann , yury.norov@gmail.com, andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk, dennis@kernel.org, tj@kernel.org, cl@linux.com, rostedt@goodmis.org, pmladek@suse.com, senozhatsky@chromium.org, john.ogness@linutronix.de, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, fweisbec@gmail.com, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, Andrew Morton , jpoimboe@kernel.org, linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-omap@vger.kernel.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-perf-users@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-xtensa@linux-xtensa.org, linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-tegra@vger.kernel.org, linux-arch@vger.kernel.org, kasan-dev@googlegroups.com Subject: Re: [PATCH v2 08/44] cpuidle,imx6: Push RCU-idle into driver Message-ID: References: <20220919095939.761690562@infradead.org> <20220919101520.869531945@infradead.org> <20220919144941.GA62211@lothringen> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220919144941.GA62211@lothringen> Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org On Mon, Sep 19, 2022 at 04:49:41PM +0200, Frederic Weisbecker wrote: > On Mon, Sep 19, 2022 at 11:59:47AM +0200, Peter Zijlstra wrote: > > Doing RCU-idle outside the driver, only to then temporarily enable it > > again, at least twice, before going idle is daft. > > > > Signed-off-by: Peter Zijlstra (Intel) > > --- > > arch/arm/mach-imx/cpuidle-imx6sx.c | 5 ++++- > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > --- a/arch/arm/mach-imx/cpuidle-imx6sx.c > > +++ b/arch/arm/mach-imx/cpuidle-imx6sx.c > > @@ -47,7 +47,9 @@ static int imx6sx_enter_wait(struct cpui > > cpu_pm_enter(); > > cpu_cluster_pm_enter(); > > > > + ct_idle_enter(); > > cpu_suspend(0, imx6sx_idle_finish); > > + ct_idle_exit(); > > > > cpu_cluster_pm_exit(); > > cpu_pm_exit(); > > @@ -87,7 +89,8 @@ static struct cpuidle_driver imx6sx_cpui > > */ > > .exit_latency = 300, > > .target_residency = 500, > > - .flags = CPUIDLE_FLAG_TIMER_STOP, > > + .flags = CPUIDLE_FLAG_TIMER_STOP | > > + CPUIDLE_FLAG_RCU_IDLE, > > .enter = imx6sx_enter_wait, > > There is a second one below that also uses imx6sx_enter_wait. Oh, above you mean; but only @index==2 gets us into the whole PM crud. @index==1 is fine afaict.