linux-kernel - Re: [PATCH] rate limit drm:radeon_cp

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Date:	Tue, 9 Sep 2008 09:15:36 +0100 (IST)
From:	Dave Airlie <airlied@...ux.ie>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Roberto Oppedisano <roppedisano@...racomspa.it>,
	LKML <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.sourceforge.net
Subject: Re: [PATCH] rate limit drm:radeon_cp_idle/reset errors


> > > > Sep  6 10:24:31 poppero1 kernel: [  186.138774] [drm:radeon_cp_start] *ERROR* radeon_cp_start called without lock held, held  0 owner f726bc80 f68f6840
> > > > Sep  6 10:24:31 poppero1 kernel: [  186.138968] [drm:radeon_cp_idle] *ERROR* radeon_cp_idle called without lock held, held  0 owner f726bc80 f68f6840
> > > > Sep  6 10:24:31 poppero1 kernel: [  186.139214] [drm:radeon_cp_reset] *ERROR* radeon_cp_reset called without lock held, held  0 owner f726bc80 f68f6840
> > > > Sep  6 10:24:31 poppero1 kernel: [  186.139408] [drm:radeon_cp_start] *ERROR* radeon_cp_start called without lock held, held  0 owner f726bc80 f68f6840
> > > > Sep  6 10:24:31 poppero1 kernel: [  186.139601] [drm:radeon_cp_idle] *ERROR* radeon_cp_idle called without lock held, held  0 owner f726bc80 f68f6840
> > > > Sep  6 10:24:31 poppero1 kernel: [  186.139866] [drm:radeon_cp_reset] *ERROR* radeon_cp_reset called without lock held, held  0 owner f726bc80 f68f6840
> > > > Sep  6 10:24:31 poppero1 kernel: [  186.140072] [drm:radeon_cp_start] *ERROR* radeon_cp_start called without lock held, held  0 owner f726bc80 f68f6840
> > > > Sep  6 10:24:31 poppero1 kernel: [  186.140467] [drm:radeon_cp_idle] *ERROR* radeon_cp_idle called without lock held, held  0 owner f726bc80 f68f6840
> > > > Sep  6 10:24:36 poppero1 kernel: [  191.139019] __ratelimit: 253431 callbacks suppressed
> > > > Sep  6 10:24:36 poppero1 kernel: [  191.139030] [drm:radeon_cp_reset] *ERROR* radeon_cp_reset called without lock held, held  0 owner f726bc80 f68f6840
> > > > Sep  6 10:24:36 poppero1 kernel: [  191.139314] [drm:radeon_cp_start] *ERROR* radeon_cp_start called without lock held, held  0 owner f726bc80 f68f6840
> > > > 
> > > > Also if it doesn't solve a bug I think it may still be worth applying it. 
> > > > Patch is against current git.
> > > > 
> > > > Signed-off-by: Roberto Oppedisano <roberto.oppedisano@...racom.it>
> > > > 
> > > > diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> > > > index 1c1b13e..1107361 100644
> > > > --- a/include/drm/drmP.h
> > > > +++ b/include/drm/drmP.h
> > > > @@ -162,7 +162,8 @@ struct drm_device;
> > > >   * \param arg arguments
> > > >   */
> > > >  #define DRM_ERROR(fmt, arg...) \
> > > > -	printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* " fmt , __func__ , ##arg)
> > > > +	if (printk_ratelimit()) \
> > > > +		printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* " fmt , __func__ , ##arg)
> > > >  
> > > >  /**
> > > >   * Memory error output.
> > > > 
> > > 
> > > Which kernel version(s)?
> > 
> > This is against vanilla current git. 
> > 
> > Linux poppero1 2.6.27-rc5-00000-g7686ad5-dirty #1 PREEMPT Sun Sep 7 08:47:08 CEST 2008 i686 GNU/Linux
> > 
> 
> Thanks.  I should have asked earlier: was 2.6.26 OK?  Any other kernels
> tested?

This looks like a userspace problem, some app is accessing the drm file 
descriptror without holding the drm lock, this is very illegal.

Its probably a race between the X server and the AIGLX driver.

Dave.
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