linux-kernel - [PATCH v6 4/4] platform/x86/intel/pmc: core: Report duration of time in HW sleep state

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Date:   Mon, 3 Apr 2023 16:18:30 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Sven van Ashbrook <svenva@...omium.org>,
        John Stultz <jstultz@...gle.com>,
        Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
        David E Box <david.e.box@...el.com>
CC:     Raul Rangel <rrangel@...omium.org>,
        Rajat Jain <rajatja@...gle.com>,
        "S-k Shyam-sundar" <Shyam-sundar.S-k@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        <linux-kernel@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>,
        Mark Gross <markgross@...nel.org>
Subject: [PATCH v6 4/4] platform/x86/intel/pmc: core: Report duration of time in HW sleep state

intel_pmc_core displays a warning when the module parameter
`warn_on_s0ix_failures` is set and a suspend didn't get to a HW sleep
state.

Report this to the standard kernel reporting infrastructure so that
userspace software can query after the suspend cycle is done.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
v5->v6:
 * Handle overflow case
 * Use renamed symbol
v4->v5:
 * Reword commit message
---
 drivers/platform/x86/intel/pmc/core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 925c5d676a43..0621756792c8 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -1214,6 +1214,11 @@ static inline bool pmc_core_is_s0ix_failed(struct pmc_dev *pmcdev)
 	if (pmc_core_dev_state_get(pmcdev, &s0ix_counter))
 		return false;
 
+	if (s0ix_counter >= pmcdev->s0ix_counter)
+		pm_report_hw_sleep_time(s0ix_counter - pmcdev->s0ix_counter);
+	else
+		pm_report_hw_sleep_time(U64_MAX);
+
 	if (s0ix_counter == pmcdev->s0ix_counter)
 		return true;
 
-- 
2.34.1