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SubjectRe: [PATCH] ACPI: PM: Avoid attaching ACPI PM domain to certain devices
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On Thu, 2019-12-05 at 09:32 -0800, Todd Brandt wrote:
> On Wed, 2019-12-04 at 22:04 +0800, Zhang Rui wrote:
> > On Wed, 2019-12-04 at 02:54 +0100, Rafael J. Wysocki wrote:
> > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > >
> > > Certain ACPI-enumerated devices represented as platform devices
> > > in
> > > Linux, like fans, require special low-level power management
> > > handling
> > > implemented by their drivers that is not in agreement with the
> > > ACPI
> > > PM domain behavior. That leads to problems with managing ACPI
> > > fans
> > > during system-wide suspend and resume.
> > >
> > > For this reason, make acpi_dev_pm_attach() skip the affected
> > > devices
> > > by adding a list of device IDs to avoid to it and putting the IDs
> > > of
> > > the affected devices into that list.
> > >
> > > Fixes: e5cc8ef31267 (ACPI / PM: Provide ACPI PM callback routines
> > > for
> > > subsystems)
> > > Reported-by: Zhang Rui <rui.zhang@intel.com>
> > > Cc: 3.10+ <stable@vger.kernel.org> # 3.10+
> > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > > ---
> > >
> > > Rui,
> > >
> > > Please test this on the machine(s) affected by the fan
> > > suspend/resume
> > > issues.
> >
> > Sure, Todd and I will re-run stress test with this patch applied
> > when
> > 5.5-rc1 released.
>
> I've applied it 5.4.0 and will do a full stress test run this weekend
> in the lab (where 7 out of 20 machines have this issue). The kernel
> will be called "5.4.0-acpifanfix", and the data should be ready
> Sunday
> Dec 8.
>
> This is the issue I'll test for:
> https://bugzilla.kernel.org/show_bug.cgi?id=204321
>

The test data is in and I'm very happy to report that the patch works
extremely well. Here's the data gathered on the bugzilla issue 204321:
ACPI fan resume is too long.

[With the patch]

Kernel Host Test Run Count Rate
5.4.0-acpifanfix otcpl-whl-u-clear mem-x2351 1 0.04%
5.4.0-acpifanfix otcpl-z170x-ud5 mem-x2369 0 0%
5.4.0-acpifanfix otcpl-z170x-ud5 freeze-x2492 0 0%
5.4.0-acpifanfix otcpl-whl-u-clear freeze-x2411 0 0%
5.4.0-acpifanfix otcpl-whl-u mem-x2289 0 0%
5.4.0-acpifanfix otcpl-whl-u freeze-x2389 0 0%
5.4.0-acpifanfix otcpl-icl-u-2 mem-x2273 0 0%
5.4.0-acpifanfix otcpl-icl-u-2 freeze-x817 0 0%
5.4.0-acpifanfix otcpl-glk-rvp-1 freeze-x122 0 0%
5.4.0-acpifanfix otcpl-dell-p5510-xeon-1 mem-x1851 0 0%
5.4.0-acpifanfix otcpl-dell-p5510-xeon-1 freeze-x1994 0 0%
5.4.0-acpifanfix otcpl-dell-inspiron-3493 mem-x1722 0 0%
5.4.0-acpifanfix otcpl-dell-inspiron-3493 freeze-x2102 0 0%
5.4.0-acpifanfix otcpl-cfl-u-01 mem-x39 0 0%
5.4.0-acpifanfix otcpl-cfl-u-01 freeze-x2091 0 0%
5.4.0-acpifanfix otcpl-cfl-h mem-x415 0 0%
5.4.0-acpifanfix otcpl-cfl-h freeze-x2265 0 0%
5.4.0-acpifanfix otcpl-aml-y mem-x3126 0 0%
5.4.0-acpifanfix otcpl-aml-y freeze-x2288 0 0%

[Without the patch]

Kernel Host Test Run Count Rate
5.3.0+ otcpl-icl-u-2 mem-x2571 2571 100.00%
5.3.0+ otcpl-whl-u mem-x2497 2497 100.00%
5.3.0+ otcpl-cfl-h mem-x2068 2068 100.00%
5.3.0+ otcpl-glk-rvp-1 mem-x75 74 98.67%
5.3.0+ otcpl-cfl-u-01 mem-x1074 1050 97.77%
5.3.0+ otcpl-glk-rvp-1 freeze-x45 12 26.67%
5.3.0+ otcpl-whl-u freeze-x2649 428 16.16%
5.3.0+ otcpl-aml-y freeze-x2434 373 15.32%
5.3.0+ otcpl-cfl-u-01 freeze-x2419 123 5.08%
5.3.0+ otcpl-latexo-ivb-cpt freeze-x1914 97 5.07%
5.3.0+ otcpl-whl-u-clear mem-x2640 69 2.61%
5.3.0+ otcpl-icl-u-2 freeze-x2757 59 2.14%
5.3.0+ otcpl-whl-u-clear freeze-x2830 53 1.87%
5.3.0+ otcpl-tgl-rvp freeze-x2086 20 0.96%
5.3.0+ otcpl-cfl-h freeze-x2457 8 0.33%
5.3.0+ otcpl-latexo-ivb-cpt mem-x2000 4 0.20%
5.3.0+ otcpl-aml-y mem-x2727 2 0.07%
5.3.0+ otcpl-z170x-ud5 mem-x2669 0 0%
5.3.0+ otcpl-z170x-ud5 freeze-x2881 0 0%
5.3.0+ otcpl-lenovo-ideapad-130 mem-x2000 0 0%
5.3.0+ otcpl-lenovo-ideapad-130 freeze-x2000 0 0%
5.3.0+ otcpl-dell-p5510-xeon-2 mem-x570 0 0%
5.3.0+ otcpl-dell-p5510-xeon-2 freeze-x1093 0 0%
5.3.0+ otcpl-dell-p5510-xeon-1 mem-x2209 0 0%
5.3.0+ otcpl-dell-p5510-xeon-1 freeze-x2431 0 0%
5.3.0+ otcpl-dell-inspiron-3493 freeze-x1170 0 0%
5.3.0+ otcpl-chromebook-hsw freeze-x1305 0 0%
5.3.0+ otcpl-chromebook-hsw freeze-x368 0 0%

> >
> > thanks,
> > rui
> >
> > >
> > > I don't really see any cleaner way to address this problem,
> > > because
> > > the
> > > ACPI PM domain should not be used with the devices in question
> > > even
> > > if
> > > the driver that binds to them is not loaded.
> > >
> > > Cheers,
> > > Rafael
> > >
> > > ---
> > > drivers/acpi/device_pm.c | 12 +++++++++++-
> > > 1 file changed, 11 insertions(+), 1 deletion(-)
> > >
> > > Index: linux-pm/drivers/acpi/device_pm.c
> > > =================================================================
> > > ==
> > > --- linux-pm.orig/drivers/acpi/device_pm.c
> > > +++ linux-pm/drivers/acpi/device_pm.c
> > > @@ -1314,9 +1314,19 @@ static void acpi_dev_pm_detach(struct de
> > > */
> > > int acpi_dev_pm_attach(struct device *dev, bool power_on)
> > > {
> > > + /*
> > > + * Skip devices whose ACPI companions match the device IDs
> > > below,
> > > + * because they require special power management handling
> > > incompatible
> > > + * with the generic ACPI PM domain.
> > > + */
> > > + static const struct acpi_device_id special_pm_ids[] = {
> > > + {"PNP0C0B", }, /* Generic ACPI fan */
> > > + {"INT3404", }, /* Fan */
> > > + {}
> > > + };
> > > struct acpi_device *adev = ACPI_COMPANION(dev);
> > >
> > > - if (!adev)
> > > + if (!adev || !acpi_match_device_ids(adev, special_pm_ids))
> > > return 0;
> > >
> > > /*
> > >
> > >
> > >
> >
> >

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