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From:   "Rafael J. Wysocki" <rafael@kernel.org>
Date:   Tue, 10 Dec 2019 00:03:18 +0100
Message-ID: <CAJZ5v0g=D3uOhETbAcuXEQfwNSK5RtK6-XVgOtRr-4n718Pifg@mail.gmail.com>
Subject: Re: [PATCH] ACPI: PM: Avoid attaching ACPI PM domain to certain devices
To:     Todd Brandt <todd.e.brandt@linux.intel.com>
Cc:     Zhang Rui <rui.zhang@intel.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Linux ACPI <linux-acpi@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux PM <linux-pm@vger.kernel.org>,
        "Brandt, Todd E" <todd.e.brandt@intel.com>
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On Mon, Dec 9, 2019 at 11:49 PM Todd Brandt
<todd.e.brandt@linux.intel.com> wrote:
>
> 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%

Great, thanks for the verification!

I will queue up the patch for the next ACPI pull request, then.

Thanks!