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

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Message-Id: <20110908165139.caa9ddef.akpm@linux-foundation.org>
Date:	Thu, 8 Sep 2011 16:51:39 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jack Steiner <steiner@....com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH] UV2 - Bug fix for GRU global addresses

(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?
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