linux-kernel - [PATCH v8 0/4] Add vendor agnostic mechanism to report hardware sleep

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Message-ID: <20230412194917.7164-1-mario.limonciello@amd.com>
Date:   Wed, 12 Apr 2023 14:49:12 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Box David E <david.e.box@...el.com>, <jstultz@...gle.com>,
        <pavel@....cz>, <svenva@...omium.org>,
        <platform-driver-x86@...r.kernel.org>, <linux-pm@...r.kernel.org>
CC:     <Shyam-sundar.S-k@....com>, <rrangel@...omium.org>,
        Jain Rajat <rajatja@...gle.com>, <hdegoede@...hat.com>,
        Mario Limonciello <mario.limonciello@....com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v8 0/4] Add vendor agnostic mechanism to report hardware sleep

An important part of validating that s0ix worked properly is to check how
much of a cycle was spent in a hardware sleep state.

The reporting of hardware sleep is a mix of kernel messages and sysfs
files that vary from vendor to vendor. Collecting this information
requires extra information on the kernel command line or fetching from
debugfs.

To make this information more readily accessible introduce a new file in
suspend_stats that drivers can report into during their resume routine.

Userspace can fetch this information and compare it against the duration
of the cycle to allow determining residency percentages and flagging
problems.

Mario Limonciello (4):
  PM: Add sysfs files to represent time spent in hardware sleep state
  platform/x86/amd: pmc: Report duration of time in hw sleep state
  platform/x86/intel/pmc: core: Always capture counters on suspend
  platform/x86/intel/pmc: core: Report duration of time in HW sleep
    state

 Documentation/ABI/testing/sysfs-power | 29 +++++++++++++
 drivers/platform/x86/amd/pmc.c        |  6 +--
 drivers/platform/x86/intel/pmc/core.c | 16 ++++----
 drivers/platform/x86/intel/pmc/core.h |  2 -
 include/linux/suspend.h               |  8 ++++
 kernel/power/main.c                   | 59 +++++++++++++++++++++------
 6 files changed, 95 insertions(+), 25 deletions(-)

base-commit: 09a9639e56c01c7a00d6c0ca63f4c7c41abe075d
-- 
2.34.1