DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :cc:content-type:content-transfer-encoding;
        b=dkwsiJGMz4YbT0Hu/fjLnScoGtmamrlt0KWZ42UFkHoXdgkm9oiZJ0RLuL/lA5LEm4
         obaCs8jrnPUNdwVYGwiJxWJlMlWWZNAU8BKoFjT/Ucs3FmcFGNcOPOVw0OeuOQYugZPh
         f5bYcsiFT2NoGtZGOlhFi5m6npR8IfgNvW+k0=
MIME-Version: 1.0
In-Reply-To: <BANLkTikEsZHjqzT6Ur+XgJhkzJDpSy-FDA@mail.gmail.com>
References: <BANLkTinud+4nUkZtnYRrU_gAFaMDWRa_AA@mail.gmail.com>
	<4DA655E7.3000904@zytor.com>
	<BANLkTimqR_M5keMqr5WAuz-t+1BkCZbwCg@mail.gmail.com>
	<BANLkTincU4rM+SqhzGOK_Rgxgg8fqJOOdQ@mail.gmail.com>
	<20110415131152.GJ18463@8bytes.org>
	<20110415131650.GB18660@elte.hu>
	<20110415154604.GN18463@8bytes.org>
	<BANLkTim23SQiyb4R+QA7=fpPZrnQw9_PRQ@mail.gmail.com>
	<20110416163509.GS18463@8bytes.org>
	<BANLkTimxG3QoLx0vqw9YgE_s4qyzcEoEaQ@mail.gmail.com>
	<20110417140924.GU18463@8bytes.org>
	<BANLkTikEsZHjqzT6Ur+XgJhkzJDpSy-FDA@mail.gmail.com>
Date: Mon, 18 Apr 2011 11:29:24 -0400
Message-ID: <BANLkTin3XeXBEvWZcKVdPvif=Ndr0h3UVA@mail.gmail.com>
Subject: Re: Linux 2.6.39-rc3
From: Jerome Glisse <j.glisse@gmail.com>
To: Alex Deucher <alexdeucher@gmail.com>
Cc: Joerg Roedel <joro@8bytes.org>, Yinghai Lu <yinghai@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
        "H. Peter Anvin" <hpa@zytor.com>, Tejun Heo <tj@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>, alexandre.f.demers@gmail.com
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8BIT
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1602
Lines: 36

On Mon, Apr 18, 2011 at 11:23 AM, Alex Deucher <alexdeucher@gmail.com> wrote:
> On Sun, Apr 17, 2011 at 10:09 AM, Joerg Roedel <joro@8bytes.org> wrote:
>> On Sat, Apr 16, 2011 at 02:54:04PM -0400, Jerome Glisse wrote:
>>
>>> If you want to go the printk way you can add printk before each test
>>> ring_test, ib_test in r600.c this 2 functions are the own that might
>>> trigger the first GPU gart activities.
>>
>> Okay, I found the place in source that triggers this. It happens in the
>> function r600_ib_test. The interesting thing is that not the ib-command
>> itself is responsible but the fence that is emitted afterwards (proved
>> by removing the fence command, where the problem went away).
>> I don't know enough about the command semantics to make a guess what
>> goes wrong there. But maybe you GPU folks have an idea?
>>
>
> I can't think of anything off hand. ?It might be worth disabling the
> call to r600_ib_test() in r600_init() and then seeing if you get any
> errors when the fences are used later on when X starts or just at that
> point in the module load sequence. ?What's odd is that when you tested
> radeon.no_wb=1 you got the same behavior as that disables shadowing of
> fence writes to gpu gart mem, so it wouldn't be writing to memory in
> that case.
>
> Alex
>

It might be the irq ring write that is faulty.

Cheers,
Jerome
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/