From patchwork Wed Feb 29 03:11:41 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob X-Patchwork-Id: 6984 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id DEC3F2447B for ; Wed, 29 Feb 2012 03:12:01 +0000 (UTC) Received: from mail-iy0-f180.google.com (mail-iy0-f180.google.com [209.85.210.180]) by fiordland.canonical.com (Postfix) with ESMTP id 8EC02A18089 for ; Wed, 29 Feb 2012 03:12:01 +0000 (UTC) Received: by mail-iy0-f180.google.com with SMTP id e36so2503688iag.11 for ; Tue, 28 Feb 2012 19:12:01 -0800 (PST) Received: from mr.google.com ([10.43.52.74]) by 10.43.52.74 with SMTP id vl10mr19058710icb.55.1330485121423 (num_hops = 1); Tue, 28 Feb 2012 19:12:01 -0800 (PST) Received: by 10.43.52.74 with SMTP id vl10mr15392475icb.55.1330485121269; Tue, 28 Feb 2012 19:12:01 -0800 (PST) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.231.11.10 with SMTP id r10csp23419ibr; Tue, 28 Feb 2012 19:12:00 -0800 (PST) Received: by 10.100.233.35 with SMTP id f35mr2081511anh.37.1330485120365; Tue, 28 Feb 2012 19:12:00 -0800 (PST) Received: from mail-gy0-f178.google.com (mail-gy0-f178.google.com [209.85.160.178]) by mx.google.com with ESMTPS id v6si9893897anf.83.2012.02.28.19.12.00 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 28 Feb 2012 19:12:00 -0800 (PST) Received-SPF: neutral (google.com: 209.85.160.178 is neither permitted nor denied by best guess record for domain of rob.lee@linaro.org) client-ip=209.85.160.178; Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.160.178 is neither permitted nor denied by best guess record for domain of rob.lee@linaro.org) smtp.mail=rob.lee@linaro.org Received: by mail-gy0-f178.google.com with SMTP id f1so1446730ghb.37 for ; Tue, 28 Feb 2012 19:12:00 -0800 (PST) Received-SPF: pass (google.com: domain of rob.lee@linaro.org designates 10.100.233.35 as permitted sender) client-ip=10.100.233.35; Received: from mr.google.com ([10.100.233.35]) by 10.100.233.35 with SMTP id f35mr2687212anh.37.1330485120201 (num_hops = 1); Tue, 28 Feb 2012 19:12:00 -0800 (PST) MIME-Version: 1.0 Received: by 10.100.233.35 with SMTP id f35mr2081479anh.37.1330485117590; Tue, 28 Feb 2012 19:11:57 -0800 (PST) Received: from b18647-20 ([216.59.3.73]) by mx.google.com with ESMTPS id j2sm32232637ani.19.2012.02.28.19.11.54 (version=SSLv3 cipher=OTHER); Tue, 28 Feb 2012 19:11:57 -0800 (PST) From: Robert Lee To: len.brown@intel.com, khilman@ti.com Cc: robherring2@gmail.com, Baohua.Song@csr.com, amit.kucheria@linaro.org, nicolas.ferre@atmel.com, linux@maxim.org.za, kgene.kim@samsung.com, amit.kachhap@linaro.org, magnus.damm@gmail.com, nsekhar@ti.com, daniel.lezcano@linaro.org, mturquette@linaro.org, vincent.guittot@linaro.org, arnd.bergmann@linaro.org, linux-arm-kernel@lists.infradead.org, linaro-dev@lists.linaro.org, patches@linaro.org, deepthi@linux.vnet.ibm.com, broonie@opensource.wolfsonmicro.com, nicolas.pitre@linaro.org, linux@arm.linux.org.uk, jean.pihet@newoldbits.com, venki@google.com, ccross@google.com, g.trinabh@gmail.com, kernel@wantstofly.org, lethal@linux-sh.org, jon-hunter@ti.com, tony@atomide.com, linux-omap@vger.kernel.org, linux-sh@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v6 1/9] cpuidle: Add common time keeping and irq enabling Date: Tue, 28 Feb 2012 21:11:41 -0600 Message-Id: <1330485109-7327-2-git-send-email-rob.lee@linaro.org> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1330485109-7327-1-git-send-email-rob.lee@linaro.org> References: <1330485109-7327-1-git-send-email-rob.lee@linaro.org> X-Gm-Message-State: ALoCoQnY/ztNqg0D4elpPx9ZsVqjA3KBogZnQO/ljZ8ZZUwjvTY/iRicHPBQEISH9bEBu3XYkRJh Make necessary changes to implement time keeping and irq enabling in the core cpuidle code. This will allow the removal of these functionalities from various platform cpuidle implementations whose timekeeping and irq enabling follows the form in this common code. Signed-off-by: Robert Lee --- arch/arm/include/asm/cpuidle.h | 14 ++++++ drivers/cpuidle/cpuidle.c | 90 ++++++++++++++++++++++++++++++++-------- include/linux/cpuidle.h | 13 ++++++ 3 files changed, 99 insertions(+), 18 deletions(-) create mode 100644 arch/arm/include/asm/cpuidle.h diff --git a/arch/arm/include/asm/cpuidle.h b/arch/arm/include/asm/cpuidle.h new file mode 100644 index 0000000..1d2075b --- /dev/null +++ b/arch/arm/include/asm/cpuidle.h @@ -0,0 +1,14 @@ +#ifndef __ASM_ARM_CPUIDLE_H +#define __ASM_ARM_CPUIDLE_H + +/* Common ARM WFI state */ +#define CPUIDLE_ARM_WFI_STATE {\ + .enter = cpuidle_simple_enter,\ + .exit_latency = 1,\ + .target_residency = 1,\ + .flags = CPUIDLE_FLAG_TIME_VALID,\ + .name = "WFI",\ + .desc = "ARM core clock gating (WFI)",\ +} + +#endif diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 59f4261..00b02f5 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include "cpuidle.h" @@ -53,6 +54,24 @@ static void cpuidle_kick_cpus(void) {} static int __cpuidle_register_device(struct cpuidle_device *dev); +static inline int cpuidle_enter(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + struct cpuidle_state *target_state = &drv->states[index]; + return target_state->enter(dev, drv, index); +} + +static inline int cpuidle_enter_tk(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + return cpuidle_wrap_enter(dev, drv, index, cpuidle_enter); +} + +typedef int (*cpuidle_enter_t)(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index); + +static cpuidle_enter_t cpuidle_enter_ops; + /** * cpuidle_idle_call - the main idle loop * @@ -63,7 +82,6 @@ int cpuidle_idle_call(void) { struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); struct cpuidle_driver *drv = cpuidle_get_driver(); - struct cpuidle_state *target_state; int next_state, entered_state; if (off) @@ -92,12 +110,10 @@ int cpuidle_idle_call(void) return 0; } - target_state = &drv->states[next_state]; - trace_power_start(POWER_CSTATE, next_state, dev->cpu); trace_cpu_idle(next_state, dev->cpu); - entered_state = target_state->enter(dev, drv, next_state); + entered_state = cpuidle_enter_ops(dev, drv, next_state); trace_power_end(dev->cpu); trace_cpu_idle(PWR_EVENT_EXIT, dev->cpu); @@ -110,7 +126,8 @@ int cpuidle_idle_call(void) dev->states_usage[entered_state].time += (unsigned long long)dev->last_residency; dev->states_usage[entered_state].usage++; - } + } else + dev->last_residency = 0; /* give the governor an opportunity to reflect on the outcome */ if (cpuidle_curr_governor->reflect) @@ -164,20 +181,29 @@ void cpuidle_resume_and_unlock(void) EXPORT_SYMBOL_GPL(cpuidle_resume_and_unlock); -#ifdef CONFIG_ARCH_HAS_CPU_RELAX -static int poll_idle(struct cpuidle_device *dev, - struct cpuidle_driver *drv, int index) +/** + * cpuidle_wrap_enter - performs timekeeping and irqen around enter function + * @dev: pointer to a valid cpuidle_device object + * @drv: pointer to a valid cpuidle_driver object + * @index: index of the target cpuidle state. + */ +int cpuidle_wrap_enter(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index, + int (*enter)(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index)) { - ktime_t t1, t2; + ktime_t time_start, time_end; s64 diff; - t1 = ktime_get(); + time_start = ktime_get(); + + index = enter(dev, drv, index); + + time_end = ktime_get(); + local_irq_enable(); - while (!need_resched()) - cpu_relax(); - t2 = ktime_get(); - diff = ktime_to_us(ktime_sub(t2, t1)); + diff = ktime_to_us(ktime_sub(time_end, time_start)); if (diff > INT_MAX) diff = INT_MAX; @@ -186,6 +212,31 @@ static int poll_idle(struct cpuidle_device *dev, return index; } +int cpuidle_simple_enter(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + cpu_do_idle(); + + return index; +} + +#ifdef CONFIG_ARCH_HAS_CPU_RELAX +static inline int __poll_idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + while (!need_resched()) + cpu_relax(); + + return index; +} + +static int poll_idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + return cpuidle_wrap_enter(dev, drv, index, + __poll_idle); +} + static void poll_idle_init(struct cpuidle_driver *drv) { struct cpuidle_state *state = &drv->states[0]; @@ -195,7 +246,6 @@ static void poll_idle_init(struct cpuidle_driver *drv) state->exit_latency = 0; state->target_residency = 0; state->power_usage = -1; - state->flags = 0; state->enter = poll_idle; } #else @@ -212,10 +262,11 @@ static void poll_idle_init(struct cpuidle_driver *drv) {} int cpuidle_enable_device(struct cpuidle_device *dev) { int ret, i; + struct cpuidle_driver *drv = cpuidle_get_driver(); if (dev->enabled) return 0; - if (!cpuidle_get_driver() || !cpuidle_curr_governor) + if (!drv || !cpuidle_curr_governor) return -EIO; if (!dev->state_count) return -EINVAL; @@ -226,13 +277,16 @@ int cpuidle_enable_device(struct cpuidle_device *dev) return ret; } - poll_idle_init(cpuidle_get_driver()); + cpuidle_enter_ops = drv->en_core_tk_irqen ? + cpuidle_enter_tk : cpuidle_enter; + + poll_idle_init(drv); if ((ret = cpuidle_add_state_sysfs(dev))) return ret; if (cpuidle_curr_governor->enable && - (ret = cpuidle_curr_governor->enable(cpuidle_get_driver(), dev))) + (ret = cpuidle_curr_governor->enable(drv, dev))) goto fail_sysfs; for (i = 0; i < dev->state_count; i++) { diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 712abcc..c91b018 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -15,6 +15,7 @@ #include #include #include +#include #define CPUIDLE_STATE_MAX 8 #define CPUIDLE_NAME_LEN 16 @@ -122,6 +123,8 @@ struct cpuidle_driver { struct module *owner; unsigned int power_specified:1; + /* set to 1 to use the core cpuidle time keeping (for all states). */ + unsigned int en_core_tk_irqen:1; struct cpuidle_state states[CPUIDLE_STATE_MAX]; int state_count; int safe_state_index; @@ -140,6 +143,13 @@ extern void cpuidle_pause_and_lock(void); extern void cpuidle_resume_and_unlock(void); extern int cpuidle_enable_device(struct cpuidle_device *dev); extern void cpuidle_disable_device(struct cpuidle_device *dev); +extern int cpuidle_simple_enter(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index); + +extern int cpuidle_wrap_enter(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index, + int (*enter)(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index)); #else static inline void disable_cpuidle(void) { } @@ -157,6 +167,9 @@ static inline void cpuidle_resume_and_unlock(void) { } static inline int cpuidle_enable_device(struct cpuidle_device *dev) {return -ENODEV; } static inline void cpuidle_disable_device(struct cpuidle_device *dev) { } +static inline int cpuidle_simple_enter(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{return -ENODEV; } #endif