Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757946AbZJFPcU (ORCPT ); Tue, 6 Oct 2009 11:32:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757617AbZJFPcS (ORCPT ); Tue, 6 Oct 2009 11:32:18 -0400 Received: from e28smtp04.in.ibm.com ([59.145.155.4]:33152 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753872AbZJFPcR (ORCPT ); Tue, 6 Oct 2009 11:32:17 -0400 Date: Tue, 6 Oct 2009 21:01:26 +0530 From: Arun R Bharadwaj To: Peter Zijlstra , Joel Schopp , Benjamin Herrenschmidt , Paul Mackerras , Ingo Molnar , Vaidyanathan Srinivasan , Dipankar Sarma , Balbir Singh , Gautham R Shenoy , Venkatesh Pallipadi , Arun Bharadwaj Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arch@vger.kernel.org Subject: [v7 PATCH 3/7]: x86: refactor x86 idle power management code and remove all instances of pm_idle. Message-ID: <20091006153126.GA7358@linux.vnet.ibm.com> Reply-To: arun@linux.vnet.ibm.com References: <20091006152421.GA7278@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20091006152421.GA7278@linux.vnet.ibm.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9533 Lines: 330 * Arun R Bharadwaj [2009-10-06 20:54:21]: This patch cleans up x86 of all instances of pm_idle. pm_idle which was earlier called from cpu_idle() idle loop is replaced by cpuidle_idle_call. x86 also registers to cpuidle when the idle routine is selected, by populating the cpuidle_device data structure for each cpu. This is replicated for apm module and for xen, which also used pm_idle. Signed-off-by: Arun R Bharadwaj --- arch/x86/kernel/apm_32.c | 37 ++++++++++++++++++-- arch/x86/kernel/process.c | 79 ++++++++++++++++++++++++++++++++----------- arch/x86/kernel/process_32.c | 3 + arch/x86/kernel/process_64.c | 3 + arch/x86/xen/setup.c | 22 +++++++++++ 5 files changed, 118 insertions(+), 26 deletions(-) Index: linux.trees.git/arch/x86/kernel/process.c =================================================================== --- linux.trees.git.orig/arch/x86/kernel/process.c +++ linux.trees.git/arch/x86/kernel/process.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -244,12 +245,6 @@ int sys_vfork(struct pt_regs *regs) unsigned long boot_option_idle_override = 0; EXPORT_SYMBOL(boot_option_idle_override); -/* - * Powermanagement idle function, if any.. - */ -void (*pm_idle)(void); -EXPORT_SYMBOL(pm_idle); - #ifdef CONFIG_X86_32 /* * This halt magic was a workaround for ancient floppy DMA @@ -329,17 +324,15 @@ static void do_nothing(void *unused) } /* - * cpu_idle_wait - Used to ensure that all the CPUs discard old value of - * pm_idle and update to new pm_idle value. Required while changing pm_idle - * handler on SMP systems. + * cpu_idle_wait - Required while changing idle routine handler on SMP systems. * - * Caller must have changed pm_idle to the new value before the call. Old - * pm_idle value will not be used by any CPU after the return of this function. + * Caller must have changed idle routine to the new value before the call. Old + * value will not be used by any CPU after the return of this function. */ void cpu_idle_wait(void) { smp_mb(); - /* kick all the CPUs so that they exit out of pm_idle */ + /* kick all the CPUs so that they exit out of idle loop */ smp_call_function(do_nothing, NULL, 1); } EXPORT_SYMBOL_GPL(cpu_idle_wait); @@ -518,15 +511,59 @@ static void c1e_idle(void) default_idle(); } +static void (*local_idle)(void); +DEFINE_PER_CPU(struct cpuidle_device, idle_devices); + +struct cpuidle_driver cpuidle_default_driver = { + .name = "cpuidle_default", +}; + +static int local_idle_loop(struct cpuidle_device *dev, struct cpuidle_state *st) +{ + ktime_t t1, t2; + s64 diff; + int ret; + + t1 = ktime_get(); + local_idle(); + t2 = ktime_get(); + + diff = ktime_to_us(ktime_sub(t2, t1)); + if (diff > INT_MAX) + diff = INT_MAX; + ret = (int) diff; + + return ret; +} + +static int setup_cpuidle_simple(void) +{ + struct cpuidle_device *dev; + int cpu; + + if (!cpuidle_curr_driver) + cpuidle_register_driver(&cpuidle_default_driver); + + for_each_online_cpu(cpu) { + dev = &per_cpu(idle_devices, cpu); + dev->cpu = cpu; + dev->states[0].enter = local_idle_loop; + dev->state_count = 1; + cpuidle_register_device(dev); + } + return 0; +} +device_initcall(setup_cpuidle_simple); + void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c) { #ifdef CONFIG_SMP - if (pm_idle == poll_idle && smp_num_siblings > 1) { + if (local_idle == poll_idle && smp_num_siblings > 1) { printk(KERN_WARNING "WARNING: polling idle and HT enabled," " performance may degrade.\n"); } #endif - if (pm_idle) + if (local_idle) return; if (cpu_has(c, X86_FEATURE_MWAIT) && mwait_usable(c)) { @@ -534,18 +571,20 @@ void __cpuinit select_idle_routine(const * One CPU supports mwait => All CPUs supports mwait */ printk(KERN_INFO "using mwait in idle threads.\n"); - pm_idle = mwait_idle; + local_idle = mwait_idle; } else if (check_c1e_idle(c)) { printk(KERN_INFO "using C1E aware idle routine\n"); - pm_idle = c1e_idle; + local_idle = c1e_idle; } else - pm_idle = default_idle; + local_idle = default_idle; + + return; } void __init init_c1e_mask(void) { /* If we're using c1e_idle, we need to allocate c1e_mask. */ - if (pm_idle == c1e_idle) + if (local_idle == c1e_idle) zalloc_cpumask_var(&c1e_mask, GFP_KERNEL); } @@ -556,7 +595,7 @@ static int __init idle_setup(char *str) if (!strcmp(str, "poll")) { printk("using polling idle threads.\n"); - pm_idle = poll_idle; + local_idle = poll_idle; } else if (!strcmp(str, "mwait")) force_mwait = 1; else if (!strcmp(str, "halt")) { @@ -567,7 +606,7 @@ static int __init idle_setup(char *str) * To continue to load the CPU idle driver, don't touch * the boot_option_idle_override. */ - pm_idle = default_idle; + local_idle = default_idle; idle_halt = 1; return 0; } else if (!strcmp(str, "nomwait")) { Index: linux.trees.git/arch/x86/kernel/process_32.c =================================================================== --- linux.trees.git.orig/arch/x86/kernel/process_32.c +++ linux.trees.git/arch/x86/kernel/process_32.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include @@ -113,7 +114,7 @@ void cpu_idle(void) local_irq_disable(); /* Don't trace irqs off for idle */ stop_critical_timings(); - pm_idle(); + cpuidle_idle_call(); start_critical_timings(); } tick_nohz_restart_sched_tick(); Index: linux.trees.git/arch/x86/kernel/process_64.c =================================================================== --- linux.trees.git.orig/arch/x86/kernel/process_64.c +++ linux.trees.git/arch/x86/kernel/process_64.c @@ -39,6 +39,7 @@ #include #include #include +#include #include #include @@ -142,7 +143,7 @@ void cpu_idle(void) enter_idle(); /* Don't trace irqs off for idle */ stop_critical_timings(); - pm_idle(); + cpuidle_idle_call(); start_critical_timings(); /* In many cases the interrupt that ended idle has already called exit_idle. But some idle Index: linux.trees.git/arch/x86/kernel/apm_32.c =================================================================== --- linux.trees.git.orig/arch/x86/kernel/apm_32.c +++ linux.trees.git/arch/x86/kernel/apm_32.c @@ -2257,6 +2257,38 @@ static struct dmi_system_id __initdata a { } }; +DEFINE_PER_CPU(struct cpuidle_device, apm_idle_devices); + +struct cpuidle_driver cpuidle_apm_driver = { + .name = "cpuidle_apm", +}; + +void __cpuinit setup_cpuidle_apm(void) +{ + struct cpuidle_device *dev; + + if (!cpuidle_curr_driver) + cpuidle_register_driver(&cpuidle_apm_driver); + + dev = &per_cpu(apm_idle_devices, smp_processor_id()); + dev->cpu = smp_processor_id(); + dev->states[0].enter = apm_cpu_idle; + dev->state_count = 1; + cpuidle_register_device(dev); +} + +void exit_cpuidle_apm(void) +{ + struct cpuidle_device *dev; + int cpu; + + for_each_online_cpu(cpu) { + dev = &per_cpu(apm_idle_devices, cpu); + cpuidle_unregister_device(dev); + } +} + + /* * Just start the APM thread. We do NOT want to do APM BIOS * calls from anything but the APM thread, if for no other reason @@ -2394,8 +2426,7 @@ static int __init apm_init(void) if (HZ != 100) idle_period = (idle_period * HZ) / 100; if (idle_threshold < 100) { - original_pm_idle = pm_idle; - pm_idle = apm_cpu_idle; + setup_cpuidle_apm(); set_pm_idle = 1; } @@ -2407,7 +2438,7 @@ static void __exit apm_exit(void) int error; if (set_pm_idle) { - pm_idle = original_pm_idle; + exit_cpuidle_apm(); /* * We are about to unload the current idle thread pm callback * (pm_idle), Wait for all processors to update cached/local Index: linux.trees.git/arch/x86/xen/setup.c =================================================================== --- linux.trees.git.orig/arch/x86/xen/setup.c +++ linux.trees.git/arch/x86/xen/setup.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include @@ -151,6 +152,25 @@ void __cpuinit xen_enable_syscall(void) #endif /* CONFIG_X86_64 */ } +DEFINE_PER_CPU(struct cpuidle_device, xen_idle_devices); +struct cpuidle_driver cpuidle_xen_driver = { + .name = "cpuidle_xen", +}; + +void __cpuinit setup_cpuidle_xen(void) +{ + struct cpuidle_device *dev; + + if (!cpuidle_curr_driver) + cpuidle_register_driver(&cpuidle_xen_driver); + + dev = &per_cpu(xen_idle_devices, smp_processor_id()); + dev->cpu = smp_processor_id(); + dev->states[0].enter = xen_idle; + dev->state_count = 1; + cpuidle_register_device(dev); +} + void __init xen_arch_setup(void) { struct physdev_set_iopl set_iopl; @@ -186,7 +206,7 @@ void __init xen_arch_setup(void) MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ? COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE); - pm_idle = xen_idle; + setup_cpuidle_xen(); paravirt_disable_iospace(); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/