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Message-ID: <20220608144516.743744529@infradead.org> User-Agent: quilt/0.66 Date: Wed, 08 Jun 2022 16:27:36 +0200 From: Peter Zijlstra To: peterz@infradead.org Cc: rth@twiddle.net, 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, benh@kernel.crashing.org, paulus@samba.org, 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, anup@brainfault.org, thierry.reding@gmail.com, jonathanh@nvidia.com, jacob.jun.pan@linux.intel.com, Arnd Bergmann , yury.norov@gmail.com, andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk, rostedt@goodmis.org, pmladek@suse.com, senozhatsky@chromium.org, john.ogness@linutronix.de, paulmck@kernel.org, frederic@kernel.org, quic_neeraju@quicinc.com, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, joel@joelfernandes.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, jpoimboe@kernel.org, linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, 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, xen-devel@lists.xenproject.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, rcu@vger.kernel.org Subject: [PATCH 13/36] cpuidle,dt: Push RCU-idle into driver References: <20220608142723.103523089@infradead.org> MIME-Version: 1.0 Doing RCU-idle outside the driver, only to then temporarily enable it again before going idle is daft. Notably: this converts all dt_init_idle_driver() and __CPU_PM_CPU_IDLE_ENTER() users for they are inextrably intertwined. Signed-off-by: Peter Zijlstra (Intel) --- arch/arm/mach-omap2/cpuidle34xx.c | 4 ++-- drivers/acpi/processor_idle.c | 2 ++ drivers/cpuidle/cpuidle-arm.c | 1 + drivers/cpuidle/cpuidle-big_little.c | 8 ++++++-- drivers/cpuidle/cpuidle-psci.c | 1 + drivers/cpuidle/cpuidle-qcom-spm.c | 1 + drivers/cpuidle/cpuidle-riscv-sbi.c | 1 + drivers/cpuidle/dt_idle_states.c | 2 +- include/linux/cpuidle.h | 4 ++++ 9 files changed, 19 insertions(+), 5 deletions(-) --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1200,6 +1200,8 @@ static int acpi_processor_setup_lpi_stat state->target_residency = lpi->min_residency; if (lpi->arch_flags) state->flags |= CPUIDLE_FLAG_TIMER_STOP; + if (lpi->entry_method == ACPI_CSTATE_FFH) + state->flags |= CPUIDLE_FLAG_RCU_IDLE; state->enter = acpi_idle_lpi_enter; drv->safe_state_index = i; } --- a/drivers/cpuidle/cpuidle-arm.c +++ b/drivers/cpuidle/cpuidle-arm.c @@ -53,6 +53,7 @@ static struct cpuidle_driver arm_idle_dr * handler for idle state index 0. */ .states[0] = { + .flags = CPUIDLE_FLAG_RCU_IDLE, .enter = arm_enter_idle_state, .exit_latency = 1, .target_residency = 1, --- a/drivers/cpuidle/cpuidle-big_little.c +++ b/drivers/cpuidle/cpuidle-big_little.c @@ -64,7 +64,8 @@ static struct cpuidle_driver bl_idle_lit .enter = bl_enter_powerdown, .exit_latency = 700, .target_residency = 2500, - .flags = CPUIDLE_FLAG_TIMER_STOP, + .flags = CPUIDLE_FLAG_TIMER_STOP | + CPUIDLE_FLAG_RCU_IDLE, .name = "C1", .desc = "ARM little-cluster power down", }, @@ -85,7 +86,8 @@ static struct cpuidle_driver bl_idle_big .enter = bl_enter_powerdown, .exit_latency = 500, .target_residency = 2000, - .flags = CPUIDLE_FLAG_TIMER_STOP, + .flags = CPUIDLE_FLAG_TIMER_STOP | + CPUIDLE_FLAG_RCU_IDLE, .name = "C1", .desc = "ARM big-cluster power down", }, @@ -124,11 +126,13 @@ static int bl_enter_powerdown(struct cpu struct cpuidle_driver *drv, int idx) { cpu_pm_enter(); + rcu_idle_enter(); cpu_suspend(0, bl_powerdown_finisher); /* signals the MCPM core that CPU is out of low power state */ mcpm_cpu_powered_up(); + rcu_idle_exit(); cpu_pm_exit(); --- a/drivers/cpuidle/cpuidle-psci.c +++ b/drivers/cpuidle/cpuidle-psci.c @@ -357,6 +357,7 @@ static int psci_idle_init_cpu(struct dev * PSCI idle states relies on architectural WFI to be represented as * state index 0. */ + drv->states[0].flags = CPUIDLE_FLAG_RCU_IDLE; drv->states[0].enter = psci_enter_idle_state; drv->states[0].exit_latency = 1; drv->states[0].target_residency = 1; --- a/drivers/cpuidle/cpuidle-qcom-spm.c +++ b/drivers/cpuidle/cpuidle-qcom-spm.c @@ -72,6 +72,7 @@ static struct cpuidle_driver qcom_spm_id .owner = THIS_MODULE, .states[0] = { .enter = spm_enter_idle_state, + .flags = CPUIDLE_FLAG_RCU_IDLE, .exit_latency = 1, .target_residency = 1, .power_usage = UINT_MAX, --- a/drivers/cpuidle/cpuidle-riscv-sbi.c +++ b/drivers/cpuidle/cpuidle-riscv-sbi.c @@ -332,6 +332,7 @@ static int sbi_cpuidle_init_cpu(struct d drv->cpumask = (struct cpumask *)cpumask_of(cpu); /* RISC-V architectural WFI to be represented as state index 0. */ + drv->states[0].flags = CPUIDLE_FLAG_RCU_IDLE; drv->states[0].enter = sbi_cpuidle_enter_state; drv->states[0].exit_latency = 1; drv->states[0].target_residency = 1; --- a/drivers/cpuidle/dt_idle_states.c +++ b/drivers/cpuidle/dt_idle_states.c @@ -77,7 +77,7 @@ static int init_state_node(struct cpuidl if (err) desc = state_node->name; - idle_state->flags = 0; + idle_state->flags = CPUIDLE_FLAG_RCU_IDLE; if (of_property_read_bool(state_node, "local-timer-stop")) idle_state->flags |= CPUIDLE_FLAG_TIMER_STOP; /* --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -282,14 +282,18 @@ extern s64 cpuidle_governor_latency_req( int __ret = 0; \ \ if (!idx) { \ + rcu_idle_enter(); \ cpu_do_idle(); \ + rcu_idle_exit(); \ return idx; \ } \ \ if (!is_retention) \ __ret = cpu_pm_enter(); \ if (!__ret) { \ + rcu_idle_enter(); \ __ret = low_level_idle_enter(state); \ + rcu_idle_exit(); \ if (!is_retention) \ cpu_pm_exit(); \ } \