linux-kernel - RE: [PATCH v8 4/4] platform/x86/intel/pmc: core: Report duration of time in HW sleep state

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <MN0PR12MB6101F7E14E3AD1ECFD6C2F25E2989@MN0PR12MB6101.namprd12.prod.outlook.com>
Date:   Thu, 13 Apr 2023 22:40:08 +0000
From:   "Limonciello, Mario" <Mario.Limonciello@....com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Box David E <david.e.box@...el.com>
CC:     "jstultz@...gle.com" <jstultz@...gle.com>,
        "pavel@....cz" <pavel@....cz>,
        "svenva@...omium.org" <svenva@...omium.org>,
        Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
        "S-k, Shyam-sundar" <Shyam-sundar.S-k@....com>,
        "rrangel@...omium.org" <rrangel@...omium.org>,
        Jain Rajat <rajatja@...gle.com>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v8 4/4] platform/x86/intel/pmc: core: Report duration of
 time in HW sleep state

[Public]



> -----Original Message-----
> From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Sent: Thursday, April 13, 2023 04:24
> To: Limonciello, Mario <Mario.Limonciello@....com>
> Cc: Box David E <david.e.box@...el.com>; jstultz@...gle.com;
> pavel@....cz; svenva@...omium.org; Rajneesh Bhardwaj
> <irenic.rajneesh@...il.com>; S-k, Shyam-sundar <Shyam-sundar.S-
> k@....com>; rrangel@...omium.org; Jain Rajat <rajatja@...gle.com>;
> hdegoede@...hat.com; Mark Gross <markgross@...nel.org>; platform-
> driver-x86@...r.kernel.org; LKML <linux-kernel@...r.kernel.org>
> Subject: Re: [PATCH v8 4/4] platform/x86/intel/pmc: core: Report duration of
> time in HW sleep state
> 
> On Wed, 12 Apr 2023, Mario Limonciello wrote:
> 
> > 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>
> > ---
> > v7->v8:
> >  * Report max sleep as well
> > ---
> >  drivers/platform/x86/intel/pmc/core.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/platform/x86/intel/pmc/core.c
> b/drivers/platform/x86/intel/pmc/core.c
> > index 925c5d676a43..f9677104353d 100644
> > --- a/drivers/platform/x86/intel/pmc/core.c
> > +++ b/drivers/platform/x86/intel/pmc/core.c
> > @@ -1153,6 +1153,7 @@ static int pmc_core_probe(struct platform_device
> *pdev)
> >  	pmc_core_do_dmi_quirks(pmcdev);
> >
> >  	pmc_core_dbgfs_register(pmcdev);
> > +	pm_report_max_hw_sleep(((1UL << 32) - 1) *
> pmc_core_adjust_slp_s0_step(pmcdev, 1));
> 
> Technically this is FIELD_MAX(SLP_S0_RES_COUNTER_MASK) *
> pmc_core_adjust...?
> Where the define is:
> #define SLP_S0_RES_COUNTER_MASK	GENMASK(31, 0)

That's fine by me to switch it over, it certainly makes it a lot more readable.
I took the value from @Box David E to use suggested in v7, so what are your
thoughts?

The current version has an overflow error reported by the robot for i386, so it
definitely needs some sort of change.

> 
> >
> >  	device_initialized = true;
> >  	dev_info(&pdev->dev, " initialized\n");
> > @@ -1214,6 +1215,8 @@ static inline bool pmc_core_is_s0ix_failed(struct
> pmc_dev *pmcdev)
> >  	if (pmc_core_dev_state_get(pmcdev, &s0ix_counter))
> >  		return false;
> >
> > +	pm_report_hw_sleep_time((u32)(s0ix_counter - pmcdev-
> >s0ix_counter));
> > +
> >  	if (s0ix_counter == pmcdev->s0ix_counter)
> >  		return true;
> >
> >
> 
> --
>  i.