Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C
From:   Mario Limonciello <mario.limonciello@amd.com>
To:     Sven van Ashbrook <svenva@chromium.org>,
        John Stultz <jstultz@google.com>,
        <platform-driver-x86@vger.kernel.org>, <linux-pm@vger.kernel.org>
CC:     Raul Rangel <rrangel@chromium.org>,
        David E Box <david.e.box@intel.com>,
        Rajat Jain <rajatja@google.com>,
        S-k Shyam-sundar <Shyam-sundar.S-k@amd.com>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Hans de Goede <hdegoede@redhat.com>,
        <linux-kernel@vger.kernel.org>,
        Mario Limonciello <mario.limonciello@amd.com>
Subject: [PATCH v6 0/4] Add vendor agnostic mechanism to report hardware sleep
Date:   Mon, 3 Apr 2023 16:18:26 -0500
Message-ID: <20230403211831.4010-1-mario.limonciello@amd.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Apr 2023 21:18:46.9569
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: fcc06b5f-7f09-4f12-46a9-08db34890314
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource: BL02EPF000100D0.namprd05.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8419
X-Spam-Status: No, score=0.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID,
        DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE autolearn=no
        autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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.

v5->v6
 * Add sysfs file for total
 * In cases we know overflow return -EOVERFLOW
 * Update documentation
 * Rename symbol
 * Fix kernel robot reported missing stub
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 | 27 ++++++++++++++++
 drivers/platform/x86/amd/pmc.c        |  5 ++-
 drivers/platform/x86/intel/pmc/core.c | 18 ++++++-----
 drivers/platform/x86/intel/pmc/core.h |  2 --
 include/linux/suspend.h               |  5 +++
 kernel/power/main.c                   | 45 +++++++++++++++++++++++++++
 6 files changed, 89 insertions(+), 13 deletions(-)

-- 
2.34.1