linux-kernel - Re: [PATCH 2/2] x86, mce, amd: extend mce-inject for support threshold interrupt event injection on AMD platform

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Date:	Mon, 3 Nov 2014 19:00:47 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Aravind Gopalakrishnan <aravind.gopalakrishnan@....com>
Cc:	Chen Yucong <slaoub@...il.com>, tony.luck@...el.com,
	ak@...ux.intel.com, gong.chen@...ux.intel.com,
	linux-edac@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86, mce, amd: extend mce-inject for support
 threshold interrupt event injection on AMD platform

On Mon, Nov 03, 2014 at 11:51:47AM -0600, Aravind Gopalakrishnan wrote:
> On 11/3/2014 11:05 AM, Aravind Gopalakrishnan wrote:
> >
> >There are three ways that have been used to report machine check event.
> >And they are MCE, CMCI/Threshold Interrupt, and POLL. On the Intel
> >platform, CMCI/Threshold Interrupt and POLL share the same event handler
> >- machine_check_poll(). However, on the AMD platform, they have a
> >separate event handler. amd_threshold_interrupt() is used for handling
> >Threshold Interrupt event. And machine_check_poll() has been used for
> >polling other events.
> >
> >This patch introduces a new flag MCJ_INTERRUPT that will be used to
> >separate CMCI/Threshold Interrupt and POLL handler in mce-inject.
> >
> >Signed-off-by: Chen Yucong <slaoub@...il.com <mailto:slaoub@...il.com>>
> >---
> > arch/x86/include/asm/mce.h              |    5 +++--
> > arch/x86/kernel/cpu/mcheck/mce-inject.c |   16 ++++++++++++++++
> > arch/x86/kernel/cpu/mcheck/threshold.c  |    1 +
> > 3 files changed, 20 insertions(+), 2 deletions(-)
> >
> 
> 
> We currently test decoding logic on AMD by performing mce injections using
> edac/mce_amd_inj.c,
> So instead of modifying mce-inject just for testing
> amd_threshold_interrupt(),
> Why not put it under mce_amd_inj? (It's AMD specific code anyway)

Right, I think this is supposed to be vendor-agnostic as it is calling
mce_threshold_vector() directly.

Btw, I wouldn't mind if someone would sit down and unify those injection
methods and come up with a saner interface which can actually be used by
humans, not those yucky files you feed mce-inject with...

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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