linux-kernel - Re: [PATCH] drm/i915: Record error batch buffers using iomem

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Message-Id: <89kc63$grv0vn@fmsmga002.fm.intel.com>
Date:	Tue, 11 May 2010 19:49:36 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	intel-gfx@...ts.freedesktop.org,
	Jaswinder Singh Rajput <jaswinderlinux@...il.com>,
	dri-devel@...ts.freedesktop.org, Dave Airlie <airlied@...ux.ie>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Record error batch buffers using iomem

On Tue, 11 May 2010 11:37:22 -0400, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Tue, 11 May 2010 19:22:14 +0100 Chris Wilson <chris@...is-wilson.co.uk> wrote:
> 
> > +	reloc_offset = src_priv->gtt_offset;
> >  	for (page = 0; page < page_count; page++) {
> > -		void *s, *d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
> > +		void __iomem *s;
> > +		void *d;
> > +
> > +		d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
> >  		if (d == NULL)
> >  			goto unwind;
> > -		s = kmap_atomic(src_priv->pages[page], KM_USER0);
> > -		memcpy(d, s, PAGE_SIZE);
> > -		kunmap_atomic(s, KM_USER0);
> > +
> > +		s = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
> > +					     reloc_offset);
> > +		memcpy_fromio(d, s, PAGE_SIZE);
> > +		io_mapping_unmap_atomic(s);
> 
> As mentioned in the other email, this will still corrupt the KM_USER0
> slot, and will generate a debug_kmap_atomic() warning.

How, as kmap_atomic(KM_USER0) is no longer used?
-- 
Chris Wilson, Intel Open Source Technology Centre
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