From: "Pali Rohár" <pali.rohar@gmail.com>
To: Juergen Gross <jgross@suse.com>
Cc: x86@kernel.org, jeremy@goop.org, jdelvare@suse.com,
peterz@infradead.org, rusty@rustcorp.com.au, akataria@vmware.com,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org, chrisw@sous-sol.org,
mingo@redhat.com, david.vrabel@citrix.com,
Douglas_Warzecha@dell.com, hpa@zytor.com,
xen-devel@lists.xenproject.org, boris.ostrovsky@oracle.com,
tglx@linutronix.de, Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH v4 6/6] hwmon: use smp_call_on_cpu() for dell-smm i8k
Date: Thu, 21 Apr 2016 15:27:35 +0200 [thread overview]
Message-ID: <20160421132735.GR29406__10393.3813552887$1461245357$gmane$org@pali> (raw)
In-Reply-To: <5718D1D4.3040309@suse.com>
On Thursday 21 April 2016 15:12:52 Juergen Gross wrote:
> On 21/04/16 12:57, Pali Rohár wrote:
> > On Tuesday 05 April 2016 21:31:52 Pali Rohár wrote:
> >> On Tuesday 05 April 2016 16:54:14 Guenter Roeck wrote:
> >>> On Tue, Apr 05, 2016 at 07:10:07AM +0200, Juergen Gross wrote:
> >>>> Use the smp_call_on_cpu() function to call system management
> >>>> mode on cpu 0.
> >>>> Make call secure by adding get_online_cpus() to avoid e.g. suspend
> >>>> resume cycles in between.
> >>>>
> >>>> Signed-off-by: Juergen Gross <jgross@suse.com>
> >>>> ---
> >>>> V4: add call to get_online_cpus()
> >>>
> >>> Pali, any chance to test this ?
> >>
> >> I can test it, but just on machine where (probably) smm calls can be
> >> send from any cpu... Need some time for testing and I believe I can do
> >> that at the end of the week.
> >
> > Sorry I had absolutely no more free time last weekend :-( And same
> > prediction is for this weekend and also next one...
>
> Pali, I've got a Dell laptop (Latitude E6440) here. Would this device be
> okay for a test?
Hi!
Proper regression test should check if this patch does not break any
function or drivers dependent on dcdbas.ko. And should be done on both
notebook devices: which needs to issue that smm call on cpu 0 and also
on which it is not needed.
Some notebooks which needs smm call to issued from cpu 0 can be found in
git commit messages of i8k, dell-laptop or dcdbas kernel drivers.
> What would you do for testing? In case you can give me
> some hints how to do a sensible test I'd do it.
Test e.g. dell-laptop.ko driver. It provides /sys interface for changing
keyboard backlight or changing rfkill switches (bluetooth wifi).
Also test tools from libsmbios (userspace) package.
There must be no difference in output/functionality with or without your
patches.
> I've verified by adding a printk() to smp_call_on_cpu() that at least
> one of the modified drivers has been used during system boot.
Also you can patch i8k/dcdbas smm function to print cpu number on which
is code running (to verify that it was really called on cpu 0 as
needed).
--
Pali Rohár
pali.rohar@gmail.com
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next prev parent reply other threads:[~2016-04-21 13:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1459833007-11618-1-git-send-email-jgross@suse.com>
2016-04-05 5:10 ` [PATCH v4 1/6] xen: sync xen header Juergen Gross
2016-04-05 5:10 ` [PATCH v4 2/6] virt, sched: add generic vcpu pinning support Juergen Gross
2016-04-05 5:10 ` [PATCH v4 3/6] smp: add function to execute a function synchronously on a cpu Juergen Gross
2016-04-05 5:10 ` [PATCH v4 4/6] xen: add xen_pin_vcpu() to support calling functions on a dedicated pcpu Juergen Gross
2016-04-05 5:10 ` [PATCH v4 5/6] dcdbas: make use of smp_call_on_cpu() Juergen Gross
2016-04-05 5:10 ` [PATCH v4 6/6] hwmon: use smp_call_on_cpu() for dell-smm i8k Juergen Gross
[not found] ` <1459833007-11618-4-git-send-email-jgross@suse.com>
2016-04-05 8:11 ` [PATCH v4 3/6] smp: add function to execute a function synchronously on a cpu Peter Zijlstra
[not found] ` <20160405081107.GH3448@twins.programming.kicks-ass.net>
2016-04-05 10:05 ` Juergen Gross
[not found] ` <1459833007-11618-2-git-send-email-jgross@suse.com>
2016-04-05 9:34 ` [PATCH v4 1/6] xen: sync xen header David Vrabel
[not found] ` <1459833007-11618-5-git-send-email-jgross@suse.com>
2016-04-05 9:45 ` [PATCH v4 4/6] xen: add xen_pin_vcpu() to support calling functions on a dedicated pcpu David Vrabel
[not found] ` <57038927.1030205@citrix.com>
2016-04-05 10:01 ` Juergen Gross
[not found] ` <57038D0E.1040708@suse.com>
2016-04-05 10:03 ` David Vrabel
[not found] ` <1459833007-11618-7-git-send-email-jgross@suse.com>
2016-04-05 14:54 ` [PATCH v4 6/6] hwmon: use smp_call_on_cpu() for dell-smm i8k Guenter Roeck
[not found] ` <20160405145414.GB27359@roeck-us.net>
2016-04-05 19:31 ` Pali Rohár
[not found] ` <201604052131.52765@pali>
2016-04-21 10:57 ` Pali Rohár
[not found] ` <20160421105724.GK29406@pali>
2016-04-21 13:12 ` Juergen Gross
[not found] ` <5718D1D4.3040309@suse.com>
2016-04-21 13:27 ` Pali Rohár [this message]
[not found] ` <20160421132735.GR29406@pali>
2016-05-09 14:37 ` Juergen Gross
[not found] ` <5730A08D.60100@suse.com>
2016-05-12 8:51 ` Pali Rohár
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