linux-kernel - Re: [PATCH 0/3] VME bus error handling overhaul

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Date:	Mon, 6 Jul 2015 17:20:20 +0300
From:	Dmitry Kalinkin <dmitry.kalinkin@...il.com>
To:	Martyn Welch <martyn.welch@...com>
Cc:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	Manohar Vanga <manohar.vanga@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Igor Alekseev <igor.alekseev@...p.ru>
Subject: Re: [PATCH 0/3] VME bus error handling overhaul

Hi Martyn,

> On 06 Jul 2015, at 15:31, Martyn Welch <martyn.welch@...com> wrote:
> 
> These are looking good to me.
Thank you for finding time to look at this and the others.
> 
> You mention error handling in relation to vme_master_mmap, am I right in thinking patch 3 avoids errors being recorded when triggered by an mmap access (so as not to appear as a spurious error on a later access)?
Yes, this is covered as well.
> 
> I think it would be worth at least logging errors to the kernel log should they be generated and not be handled by a error handler, so someone using mmap gets at least some form of notification that their accesses are resulting on bus errors. What do you think?
Yes. I agree with you. Bus error handler could print a message when an error doesn’t trigger any of the registered handlers.
What would be really useful, is if we could dispatch such errors to the userspace in a more direct way. Not sure how, though.

Cheers,
Dmitry

> 
> 
> On 02/07/15 15:11, Dmitry Kalinkin wrote:
>> This moves tsi148 error handling into VME subsystem so it can be shared with
>> the other bridge driver.  Then there is a change to close a fixme on separating
>> errors by address space.  And finally a fix for memory leak problem that was
>> introduced with support of mmap's.
>> 
>> The next logical step in this direction would be to add error handling support
>> to ca91cx42 and make it unconditional for tsi148. It also makes much sense to
>> add synchronization to error-related list operations (spinlocks, rcu).
>> 
>> Dmitry Kalinkin (3):
>>   vme: move tsi148 error handling into VME subsystem
>>   vme: include address space in error filtering
>>   vme: change bus error handling scheme
>> 
>>  drivers/vme/bridges/vme_ca91cx42.c |   3 +-
>>  drivers/vme/bridges/vme_tsi148.c   | 170 ++++++++++---------------------------
>>  drivers/vme/vme.c                  |  83 ++++++++++++++++++
>>  drivers/vme/vme_bridge.h           |  21 +++--
>>  4 files changed, 147 insertions(+), 130 deletions(-)
>> 
> 
> -- 
> Martyn Welch (Lead Software Engineer)  | Registered in England and Wales
> GE Intelligent Platforms               | (3828642) at 100 Barbirolli Square
> T +44(0)1327322748                     | Manchester, M2 3AB
> E martyn.welch@...com                  | VAT:GB 927559189

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