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Wysocki" Cc: Sven van Ashbrook , linux-pm@vger.kernel.org, platform-driver-x86@vger.kernel.org, Pavel Machek , Len Brown , John Stultz , Thomas Gleixner , Stephen Boyd , Rajneesh Bhardwaj , S-k Shyam-sundar , rrangel@chromium.org, Rajat Jain , David E Box , Hans de Goede , linux-kernel@vger.kernel.org References: <20221110064723.8882-1-mario.limonciello@amd.com> <20221110064723.8882-2-mario.limonciello@amd.com> From: "Limonciello, Mario" In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DM6PR03CA0027.namprd03.prod.outlook.com (2603:10b6:5:40::40) To MN0PR12MB6101.namprd12.prod.outlook.com (2603:10b6:208:3cb::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN0PR12MB6101:EE_|SN7PR12MB6789:EE_ X-MS-Office365-Filtering-Correlation-Id: b215cb71-d75a-4bb1-7394-08dac71c881b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MN0PR12MB6101.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(4636009)(346002)(39860400002)(366004)(136003)(396003)(376002)(451199015)(8676002)(186003)(66476007)(316002)(66946007)(4326008)(66556008)(41300700001)(2616005)(6512007)(7416002)(53546011)(8936002)(36756003)(5660300002)(31696002)(38100700002)(86362001)(83380400001)(2906002)(6666004)(6486002)(478600001)(6916009)(31686004)(66899015)(54906003)(6506007)(45980500001)(43740500002);DIR:OUT;SFP:1101; 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Wysocki wrote: > On Thu, Nov 10, 2022 at 7:49 AM Mario Limonciello > wrote: >> >> Both AMD and Intel SoCs have a concept of reporting whether the hardware >> reached a hardware sleep state over s2idle as well as how much >> time was spent in such a state. >> >> This information is valuable to both chip designers and system designers >> as it helps to identify when there are problems with power consumption >> over an s2idle cycle. >> >> To make the information discoverable, create a new sysfs file and a symbol >> that drivers from supported manufacturers can use to advertise this >> information. This file will only be exported when the system supports low >> power idle in the ACPI table. >> >> In order to effectively use this information you will ideally want to >> compare against the total duration of sleep, so export a second sysfs file >> that will show total time. This file will be exported on all systems and >> used both for s2idle and s3. > > Well, my first question would be how this is related to > > /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us > This has a dependency on the platform firmware offering an ACPI LPIT table. I don't know how common that is. As this series started from the needs on ChromeOS I would ask is that typically populated by coreboot? I would hope it's the same number that is populated in that file on supported systems though. > and > > /sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us > No relation to this one for what's in the series. >> Suggested-by: David E Box >> Signed-off-by: Mario Limonciello >> --- >> Documentation/ABI/testing/sysfs-power | 17 +++++++++++ >> include/linux/suspend.h | 4 +++ >> kernel/power/main.c | 42 +++++++++++++++++++++++++++ >> kernel/power/suspend.c | 2 ++ >> kernel/time/timekeeping.c | 2 ++ >> 5 files changed, 67 insertions(+) >> >> diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power >> index f99d433ff311..5b47cbb4dc9e 100644 >> --- a/Documentation/ABI/testing/sysfs-power >> +++ b/Documentation/ABI/testing/sysfs-power >> @@ -413,6 +413,23 @@ Description: >> The /sys/power/suspend_stats/last_failed_step file contains >> the last failed step in the suspend/resume path. >> >> +What: /sys/power/suspend_stats/last_hw_state_residency >> +Date: December 2022 >> +Contact: Mario Limonciello >> +Description: >> + The /sys/power/suspend_stats/last_hw_state_residency file contains >> + the amount of time spent in a hardware sleep state. >> + This attribute is only available if the system supports >> + low power idle. This is measured in microseconds. >> + >> +What: /sys/power/suspend_stats/last_suspend_total >> +Date: December 2022 >> +Contact: Mario Limonciello >> +Description: >> + The /sys/power/suspend_stats/last_suspend_total file contains >> + the total duration of the sleep cycle. >> + This is measured in microseconds. >> + >> What: /sys/power/sync_on_suspend >> Date: October 2019 >> Contact: Jonas Meurer >> diff --git a/include/linux/suspend.h b/include/linux/suspend.h >> index cfe19a028918..af343c3f8198 100644 >> --- a/include/linux/suspend.h >> +++ b/include/linux/suspend.h >> @@ -68,6 +68,8 @@ struct suspend_stats { >> int last_failed_errno; >> int errno[REC_FAILED_NUM]; >> int last_failed_step; >> + u64 last_hw_state_residency; >> + u64 last_suspend_total; >> enum suspend_stat_step failed_steps[REC_FAILED_NUM]; >> }; >> >> @@ -489,6 +491,8 @@ void restore_processor_state(void); >> extern int register_pm_notifier(struct notifier_block *nb); >> extern int unregister_pm_notifier(struct notifier_block *nb); >> extern void ksys_sync_helper(void); >> +extern void pm_set_hw_state_residency(u64 duration); >> +extern void pm_account_suspend_type(const struct timespec64 *t); >> >> #define pm_notifier(fn, pri) { \ >> static struct notifier_block fn##_nb = \ >> diff --git a/kernel/power/main.c b/kernel/power/main.c >> index 31ec4a9b9d70..11bd658583b0 100644 >> --- a/kernel/power/main.c >> +++ b/kernel/power/main.c >> @@ -6,6 +6,7 @@ >> * Copyright (c) 2003 Open Source Development Lab >> */ >> >> +#include >> #include >> #include >> #include >> @@ -54,6 +55,19 @@ void unlock_system_sleep(unsigned int flags) >> } >> EXPORT_SYMBOL_GPL(unlock_system_sleep); >> >> +void pm_set_hw_state_residency(u64 duration) >> +{ >> + suspend_stats.last_hw_state_residency = duration; >> +} >> +EXPORT_SYMBOL_GPL(pm_set_hw_state_residency); >> + >> +void pm_account_suspend_type(const struct timespec64 *t) >> +{ >> + suspend_stats.last_suspend_total += (s64)t->tv_sec * USEC_PER_SEC + >> + t->tv_nsec / NSEC_PER_USEC; >> +} >> +EXPORT_SYMBOL_GPL(pm_account_suspend_type); >> + >> void ksys_sync_helper(void) >> { >> ktime_t start; >> @@ -377,6 +391,20 @@ static ssize_t last_failed_step_show(struct kobject *kobj, >> } >> static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step); >> >> +static ssize_t last_hw_state_residency_show(struct kobject *kobj, >> + struct kobj_attribute *attr, char *buf) >> +{ >> + return sprintf(buf, "%llu\n", suspend_stats.last_hw_state_residency); >> +} >> +static struct kobj_attribute last_hw_state_residency = __ATTR_RO(last_hw_state_residency); >> + >> +static ssize_t last_suspend_total_show(struct kobject *kobj, >> + struct kobj_attribute *attr, char *buf) >> +{ >> + return sprintf(buf, "%llu\n", suspend_stats.last_suspend_total); >> +} >> +static struct kobj_attribute last_suspend_total = __ATTR_RO(last_suspend_total); >> + >> static struct attribute *suspend_attrs[] = { >> &success.attr, >> &fail.attr, >> @@ -391,12 +419,26 @@ static struct attribute *suspend_attrs[] = { >> &last_failed_dev.attr, >> &last_failed_errno.attr, >> &last_failed_step.attr, >> + &last_hw_state_residency.attr, >> + &last_suspend_total.attr, >> NULL, >> }; >> >> +static umode_t suspend_attr_is_visible(struct kobject *kobj, struct attribute *attr, int idx) >> +{ >> + if (attr != &last_hw_state_residency.attr) >> + return 0444; >> +#ifdef CONFIG_ACPI >> + if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) >> + return 0444; >> +#endif >> + return 0; >> +} >> + >> static const struct attribute_group suspend_attr_group = { >> .name = "suspend_stats", >> .attrs = suspend_attrs, >> + .is_visible = suspend_attr_is_visible, >> }; >> >> #ifdef CONFIG_DEBUG_FS >> diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c >> index fa3bf161d13f..b6c4a3733212 100644 >> --- a/kernel/power/suspend.c >> +++ b/kernel/power/suspend.c >> @@ -423,6 +423,8 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) >> if (suspend_test(TEST_PLATFORM)) >> goto Platform_wake; >> >> + suspend_stats.last_suspend_total = 0; >> + >> if (state == PM_SUSPEND_TO_IDLE) { >> s2idle_loop(); >> goto Platform_wake; >> diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c >> index f72b9f1de178..e1b356787e53 100644 >> --- a/kernel/time/timekeeping.c >> +++ b/kernel/time/timekeeping.c >> @@ -24,6 +24,7 @@ >> #include >> #include >> #include >> +#include >> >> #include "tick-internal.h" >> #include "ntp_internal.h" >> @@ -1698,6 +1699,7 @@ static void __timekeeping_inject_sleeptime(struct timekeeper *tk, >> tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, *delta)); >> tk_update_sleep_time(tk, timespec64_to_ktime(*delta)); >> tk_debug_account_sleep_time(delta); >> + pm_account_suspend_type(delta); >> } >> >> #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_RTC_HCTOSYS_DEVICE) >> -- >> 2.34.1 >>