From: "Luck, Tony" <tony.luck@intel.com>
To: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>, X86 ML <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/5] x86/mce: Fix all mce notifiers to update the mce->handled bitmask
Date: Thu, 13 Feb 2020 15:08:07 -0800 [thread overview]
Message-ID: <20200213230807.GA22454@agluck-desk2.amr.corp.intel.com> (raw)
In-Reply-To: <CALCETrVrL1Ps9ubAcKQykxTofn4hbkESBYE9H22Ws5Pis_vG+g@mail.gmail.com>
On Thu, Feb 13, 2020 at 02:27:31PM -0800, Andy Lutomirski wrote:
> On Thu, Feb 13, 2020 at 2:19 PM Luck, Tony <tony.luck@intel.com> wrote:
> >
> > On Thu, Feb 13, 2020 at 06:03:08PM +0100, Borislav Petkov wrote:
> > > On Wed, Feb 12, 2020 at 12:46:51PM -0800, Tony Luck wrote:
> > > > If the handler took any action to log or deal with the error, set
> > > > a bit int mce->handled so that the default handler on the end of
> > > > the machine check chain can see what has been done.
> > > >
> > > > [!!! What to do about NOTIFY_STOP ... any handler that returns this
> > > > value short-circuits calling subsequent entries on the chain. In
> > > > some cases this may be the right thing to do ... but it others we
> > > > really want to keep calling other functions on the chain]
> > >
> > > Yes, we can kill that NOTIFY_STOP thing in the mce code since it is
> > > nasty.
> >
> > Well, there are places where we want to keep NOTIFY_STOP.
>
> I very very strongly disagree.
>
> >
> > 1) Default case for CEC. We want it to "hide" the corrected error.
> > That was one of the main goals for CEC. We've discussed cases
> > where CEC shouldn't hide (when internal threshold exceeded and
> > it tries to take a page offline ... probably something related to
> > CMCI storms ... though we didn't really come to any conclusion)
>
> Then put this logic in do_machine_check() or in some sensible place
> that it calls via some ops structure or directly. Don't hide it in
> some incomprehensible, possibly nondeterministic place in a notifier
> chain.
I could make the EDAC driver (and others on the chain) check to see if
CEC already handled the error record:
if (mce->handled & MCE_HANDLED_CEC)
return NOTIFY_DONE;
Then everyone on the chain still sees the error ... just some of them
make informed decisions based on what functions earlier in the chain
did with the error record.
> > 2) Errata. Perhaps a vendor/platform specific function at the head
> > of the notify chain that weeds out errors that should never have
> > been reported.
>
> No, do this before the notifier chain please.
Ok. We don't have code that does this yet. If we need some, I'll
make sure to do the weed out before it gets to the notifier.
-Tony
next prev parent reply other threads:[~2020-02-13 23:08 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 20:46 [RFC PATCH 0/5] New way to track mce notifier chain actions Tony Luck
2020-02-12 20:46 ` [PATCH 1/5] x86/mce: Rename "first" function as "early" Tony Luck
2020-02-12 20:46 ` [PATCH 2/5] x86/mce: Convert corrected error collector to use mce notifier Tony Luck
2020-02-12 20:46 ` [PATCH 3/5] x86/mce: Add new "handled" field to "struct mce" Tony Luck
2020-02-13 16:56 ` Borislav Petkov
2020-02-13 22:09 ` Luck, Tony
2020-02-14 8:50 ` Borislav Petkov
2020-02-12 20:46 ` [PATCH 4/5] x86/mce: Fix all mce notifiers to update the mce->handled bitmask Tony Luck
2020-02-13 17:03 ` Borislav Petkov
2020-02-13 22:19 ` Luck, Tony
2020-02-13 22:27 ` Andy Lutomirski
2020-02-13 23:08 ` Luck, Tony [this message]
2020-02-14 9:02 ` Borislav Petkov
2020-02-14 0:18 ` Thomas Gleixner
2020-02-14 8:59 ` Borislav Petkov
2020-02-12 20:46 ` [PATCH 5/5] x86/mce: Change default mce logger to check mce->handled Tony Luck
2020-02-13 17:08 ` Borislav Petkov
2020-02-13 22:27 ` Luck, Tony
2020-02-14 9:05 ` Borislav Petkov
2020-02-12 23:08 ` [RFC PATCH 0/5] New way to track mce notifier chain actions Luck, Tony
2020-02-13 5:52 ` Andy Lutomirski
2020-02-13 6:09 ` Borislav Petkov
2020-02-13 16:05 ` Andy Lutomirski
2020-02-14 22:27 ` [PATCH v2 0/7] " Tony Luck
2020-02-14 22:27 ` [PATCH v2 1/7] x86/mce: Rename "first" function as "early" Tony Luck
2020-04-15 9:49 ` [tip: ras/core] " tip-bot2 for Tony Luck
2020-02-14 22:27 ` [PATCH v2 2/7] x86/mce: Convert corrected error collector to use mce notifier Tony Luck
2020-04-15 9:49 ` [tip: ras/core] x86/mce: Convert the CEC to use the MCE notifier tip-bot2 for Tony Luck
2020-02-14 22:27 ` [PATCH v2 3/7] x86/mce: Add new "kflags" field to "struct mce" Tony Luck
2020-04-15 9:49 ` [tip: ras/core] x86/mce: Add a struct mce.kflags field tip-bot2 for Tony Luck
2020-04-15 18:19 ` Luck, Tony
2020-04-15 18:36 ` Borislav Petkov
2020-04-15 19:58 ` [PATCH] x86/mce: Drop bogus comment about mce.kflags Luck, Tony
2020-04-17 9:21 ` [tip: ras/core] " tip-bot2 for Tony Luck
2020-04-20 8:06 ` [tip: ras/core] x86/mce: Add a struct mce.kflags field Christoph Hellwig
2020-04-20 8:42 ` Borislav Petkov
2020-02-14 22:27 ` [PATCH v2 4/7] x86/mce: Fix all mce notifiers to update the mce->kflags bitmask Tony Luck
2020-04-07 8:21 ` Borislav Petkov
2020-04-15 9:49 ` [tip: ras/core] " tip-bot2 for Tony Luck
2020-02-14 22:27 ` [PATCH v2 5/7] x86/mce: Change default mce logger to check mce->kflags Tony Luck
2020-04-07 11:10 ` Borislav Petkov
2020-04-07 16:43 ` Luck, Tony
2020-04-07 19:37 ` Borislav Petkov
2020-04-07 19:44 ` Luck, Tony
2020-04-15 9:49 ` [tip: ras/core] x86/mce: Change default MCE " tip-bot2 for Tony Luck
2020-02-14 22:27 ` [PATCH v2 6/7] x86/mce: Add mce=print_all option Tony Luck
2020-04-15 9:49 ` [tip: ras/core] " tip-bot2 for Tony Luck
2020-02-14 22:27 ` [PATCH v2 7/7] x86/mce: Drop the EDAC report status checks Tony Luck
2020-04-15 9:49 ` [tip: ras/core] EDAC: " tip-bot2 for Tony Luck
2020-04-07 16:34 ` [PATCH 0/9 v3] New way to track mce notifier chain actions Borislav Petkov
2020-04-07 16:34 ` [PATCH 1/9] x86/mce/amd, edac: Remove report_gart_errors Borislav Petkov
2020-04-15 9:49 ` [tip: ras/core] " tip-bot2 for Borislav Petkov
2020-04-07 16:34 ` [PATCH 2/9] x86/mce: Rename "first" function as "early" Borislav Petkov
2020-04-07 16:34 ` [PATCH 3/9] x86/mce: Convert the CEC to use the MCE notifier Borislav Petkov
2020-04-07 16:34 ` [PATCH 4/9] x86/mce: Add a struct mce.kflags field Borislav Petkov
2020-04-07 16:34 ` [PATCH 5/9] x86/mce: Fix all mce notifiers to update the mce->kflags bitmask Borislav Petkov
2020-04-07 16:34 ` [PATCH 6/9] x86/mce: Change default MCE logger to check mce->kflags Borislav Petkov
2020-04-07 16:34 ` [PATCH 7/9] x86/mce: Add mce=print_all option Borislav Petkov
2020-04-07 16:34 ` [PATCH 8/9] EDAC: Drop the EDAC report status checks Borislav Petkov
2020-04-07 16:34 ` [PATCH 9/9] x86/mce: Fixup exception only for the correct MCEs Borislav Petkov
2020-04-15 9:49 ` [tip: ras/core] " tip-bot2 for Borislav Petkov
2020-04-07 19:53 ` [PATCH 0/9 v3] New way to track mce notifier chain actions Luck, Tony
2020-04-07 19:56 ` Borislav Petkov
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