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Thu, 12 Jan 2023 20:57:13 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id BAFC42CCF1F5C; Thu, 12 Jan 2023 20:57:07 +0100 (CET) Message-ID: <20230112195540.007918454@infradead.org> User-Agent: quilt/0.66 Date: Thu, 12 Jan 2023 20:43:25 +0100 From: Peter Zijlstra To: peterz@infradead.org Cc: richard.henderson@linaro.org, ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@kernel.org, linux@armlinux.org.uk, nsekhar@ti.com, brgl@bgdev.pl, 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, krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com, 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, andersson@kernel.org, konrad.dybcio@linaro.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, mhiramat@kernel.org, frederic@kernel.org, paulmck@kernel.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, 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-samsung-soc@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, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, kasan-dev@googlegroups.com, "Rafael J. Wysocki" , Ulf Hansson Subject: [PATCH v3 11/51] cpuidle,omap4: Push RCU-idle into driver References: <20230112194314.845371875@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Doing RCU-idle outside the driver, only to then temporarily enable it again, some *four* times, before going idle is daft. Notably three times explicitly using RCU_NONIDLE() and once implicitly through cpu_pm_*(). Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Frederic Weisbecker Reviewed-by: Tony Lindgren Acked-by: Rafael J. Wysocki Tested-by: Tony Lindgren Tested-by: Ulf Hansson --- arch/arm/mach-omap2/cpuidle44xx.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-) --- a/arch/arm/mach-omap2/cpuidle44xx.c +++ b/arch/arm/mach-omap2/cpuidle44xx.c @@ -105,7 +105,9 @@ static int omap_enter_idle_smp(struct cp } raw_spin_unlock_irqrestore(&mpu_lock, flag); + ct_idle_enter(); omap4_enter_lowpower(dev->cpu, cx->cpu_state); + ct_idle_exit(); raw_spin_lock_irqsave(&mpu_lock, flag); if (cx->mpu_state_vote == num_online_cpus()) @@ -151,10 +153,10 @@ static int omap_enter_idle_coupled(struc (cx->mpu_logic_state == PWRDM_POWER_OFF); /* Enter broadcast mode for periodic timers */ - RCU_NONIDLE(tick_broadcast_enable()); + tick_broadcast_enable(); /* Enter broadcast mode for one-shot timers */ - RCU_NONIDLE(tick_broadcast_enter()); + tick_broadcast_enter(); /* * Call idle CPU PM enter notifier chain so that @@ -166,7 +168,7 @@ static int omap_enter_idle_coupled(struc if (dev->cpu == 0) { pwrdm_set_logic_retst(mpu_pd, cx->mpu_logic_state); - RCU_NONIDLE(omap_set_pwrdm_state(mpu_pd, cx->mpu_state)); + omap_set_pwrdm_state(mpu_pd, cx->mpu_state); /* * Call idle CPU cluster PM enter notifier chain @@ -178,14 +180,16 @@ static int omap_enter_idle_coupled(struc index = 0; cx = state_ptr + index; pwrdm_set_logic_retst(mpu_pd, cx->mpu_logic_state); - RCU_NONIDLE(omap_set_pwrdm_state(mpu_pd, cx->mpu_state)); + omap_set_pwrdm_state(mpu_pd, cx->mpu_state); mpuss_can_lose_context = 0; } } } + ct_idle_enter(); omap4_enter_lowpower(dev->cpu, cx->cpu_state); cpu_done[dev->cpu] = true; + ct_idle_exit(); /* Wakeup CPU1 only if it is not offlined */ if (dev->cpu == 0 && cpumask_test_cpu(1, cpu_online_mask)) { @@ -194,9 +198,9 @@ static int omap_enter_idle_coupled(struc mpuss_can_lose_context) gic_dist_disable(); - RCU_NONIDLE(clkdm_deny_idle(cpu_clkdm[1])); - RCU_NONIDLE(omap_set_pwrdm_state(cpu_pd[1], PWRDM_POWER_ON)); - RCU_NONIDLE(clkdm_allow_idle(cpu_clkdm[1])); + clkdm_deny_idle(cpu_clkdm[1]); + omap_set_pwrdm_state(cpu_pd[1], PWRDM_POWER_ON); + clkdm_allow_idle(cpu_clkdm[1]); if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD) && mpuss_can_lose_context) { @@ -222,7 +226,7 @@ static int omap_enter_idle_coupled(struc cpu_pm_exit(); cpu_pm_out: - RCU_NONIDLE(tick_broadcast_exit()); + tick_broadcast_exit(); fail: cpuidle_coupled_parallel_barrier(dev, &abort_barrier); @@ -247,7 +251,8 @@ static struct cpuidle_driver omap4_idle_ /* C2 - CPU0 OFF + CPU1 OFF + MPU CSWR */ .exit_latency = 328 + 440, .target_residency = 960, - .flags = CPUIDLE_FLAG_COUPLED, + .flags = CPUIDLE_FLAG_COUPLED | + CPUIDLE_FLAG_RCU_IDLE, .enter = omap_enter_idle_coupled, .name = "C2", .desc = "CPUx OFF, MPUSS CSWR", @@ -256,7 +261,8 @@ static struct cpuidle_driver omap4_idle_ /* C3 - CPU0 OFF + CPU1 OFF + MPU OSWR */ .exit_latency = 460 + 518, .target_residency = 1100, - .flags = CPUIDLE_FLAG_COUPLED, + .flags = CPUIDLE_FLAG_COUPLED | + CPUIDLE_FLAG_RCU_IDLE, .enter = omap_enter_idle_coupled, .name = "C3", .desc = "CPUx OFF, MPUSS OSWR", @@ -282,7 +288,8 @@ static struct cpuidle_driver omap5_idle_ /* C2 - CPU0 RET + CPU1 RET + MPU CSWR */ .exit_latency = 48 + 60, .target_residency = 100, - .flags = CPUIDLE_FLAG_TIMER_STOP, + .flags = CPUIDLE_FLAG_TIMER_STOP | + CPUIDLE_FLAG_RCU_IDLE, .enter = omap_enter_idle_smp, .name = "C2", .desc = "CPUx CSWR, MPUSS CSWR",