linux-kernel - Re: [PATCH] UV2 - Bug fix for GRU global addresses

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Date:	Thu, 8 Sep 2011 19:29:16 -0500
From:	Jack Steiner <steiner@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH] UV2 - Bug fix for GRU global addresses

On Thu, Sep 08, 2011 at 04:51:39PM -0700, Andrew Morton wrote:
> (cc x86 maintainers)
> 
> On Thu, 8 Sep 2011 13:24:13 -0500
> Jack Steiner <steiner@....com> wrote:
> 
> > This patch is a workaround for a UV2 hub bug that affects the format
> > of system global addresses.
> > 
> > The GRU API for UV2 was inadvertently broken by a hardware change. The
> > format of the physical address used for TLB dropins and for addresses used
> > with instructions running in unmapped mode has changed. This change was not
> > documented and became apparent only when diags failed running on system simulators.
> > 
> > For UV1, TLB and GRU instruction physical addresses are identical to socket
> > physical addresses (although high NASID bits must be OR'ed into the
> > address).
> > 
> > For UV2, socket physical addresses need to be converted. The NODE portion of
> > the physical address needs to be shifted so that the low bit is in bit 39 or
> > bit 40, depending on an MMR value.
> > 
> > It is not yet clear if this bug will be fixed in a silicon respin. If it
> > is fixed, the hub revision will be incremented & the workaround disabled.
> 
> It's unclear to me whether this patch should be merged into 3.1 and/or
> into 3.0.x and earlier?

3.1 is fine. I can push directly to the distros.

--- jack
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