From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Niggemann <jn@hz6.de>
Subject: Re: i915 irq storm mitigation in 3.10
Date: Thu, 25 Jul 2013 23:23:24 +0200
Message-ID: <a9eb123e84afe0bd3bfd4f169180a516@hz6.de>
References: <2b828191fde71b2243f883e2dbb28d6d@hz6.de>
	<20130708200316.GG18285@phenom.ffwll.local>
	<d0824eeb1788ff9264382449b35a72cd@hz6.de>
	<CAKMK7uGVz=9jvOGi56_Qqz-3PYrjn35vD56qn8O8RMydn0=dcA@mail.gmail.com>
	<20972.59257.635588.597578@linux-qknr.site>
	<e39862f6eaabe578fe5493786e4c6066@hz6.de>
	<20974.26726.659962.223064@linux-qknr.site>
	<dac730d08743a0582b3936d756bb8999@hz6.de>
	<20976.55523.670477.45248@linux-qknr.site>
	<CAKMK7uGiFaAROx6Nm-MzbFW9Z76brD4cqwCBcTk8Z5f6YOh9HQ@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Content-Transfer-Encoding: 7bit
Return-path: <intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org>
Received: from d119a3.x-mailer.de (d119a3.x-mailer.de [212.162.53.143])
	by gabe.freedesktop.org (Postfix) with ESMTP id 6385DE7082
	for <intel-gfx@lists.freedesktop.org>;
	Thu, 25 Jul 2013 14:23:27 -0700 (PDT)
In-Reply-To: <CAKMK7uGiFaAROx6Nm-MzbFW9Z76brD4cqwCBcTk8Z5f6YOh9HQ@mail.gmail.com>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
To: Daniel Vetter <daniel@ffwll.ch>
Cc: Egbert Eich <eich@suse.com>, intel-gfx <intel-gfx@lists.freedesktop.org>
List-Id: intel-gfx@lists.freedesktop.org

Hi Daniel,

Am 25.07.2013 11:58, schrieb Daniel Vetter:
> Can you pls try the below
> patch (on top of Egbert's debug stuff)?
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h
> index 6caa748..2d4c884 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1925,9 +1925,9 @@
>
>  #define PORT_HOTPLUG_STAT      (dev_priv->info->display_mmio_offset
> + 0x61114)
>  /* HDMI/DP bits are gen4+ */
> -#define   PORTB_HOTPLUG_LIVE_STATUS               (1 << 29)
> +#define   PORTD_HOTPLUG_LIVE_STATUS               (1 << 29)
>  #define   PORTC_HOTPLUG_LIVE_STATUS               (1 << 28)
> -#define   PORTD_HOTPLUG_LIVE_STATUS               (1 << 27)
> +#define   PORTB_HOTPLUG_LIVE_STATUS               (1 << 27)
>  #define   PORTD_HOTPLUG_INT_STATUS             (3 << 21)
>  #define   PORTC_HOTPLUG_INT_STATUS             (3 << 19)
>  #define   PORTB_HOTPLUG_INT_STATUS             (3 << 17)
I did, here are the logs:
364K http://files.hz6.de/kern_20130724_2.log
I don't understand what exactly this patch does, but I noticed:
- much less drm debug info, resulting in a much smaller log
- no more noticeable lag on my system (even though a storm was 
detected).
I double checked the latter and the lag seems indeed to be gone...

Jan