From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Michael Neuling <mikey@neuling.org>
Cc: mikey@neuling.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: powerpc: Fix /proc/cpuinfo revision for POWER9 DD2
Date: Thu, 29 Jun 2017 22:21:10 +1000 (AEST) [thread overview]
Message-ID: <3wyzKM03L9z9s8H@ozlabs.org> (raw)
In-Reply-To: <20170615015316.17070-1-mikey@neuling.org>
On Thu, 2017-06-15 at 01:53:16 UTC, Michael Neuling wrote:
> The P9 PVR bits 12-15 don't indicate a revision but instead different
> chip configurations. From BookIV we have:
> Bits Configuration
> 0 : Scale out 12 cores
> 1 : Scale out 24 cores
> 2 : Scale up 12 cores
> 3 : Scale up 24 cores
>
> DD1 doesn't use this but DD2 does. Linux will mostly use the "Scale
> out 24 core" configuration (ie. SMT4 not SMT8) which results in a PVR
> of 0x004e1200. The reported revision in /proc/cpuinfo is hence
> reported incorrectly as "18.0".
>
> This patch fixes this to mask off only the relevant bits for the major
> revision (ie. bits 8-11) for POWER9.
>
> Signed-off-by: Michael Neuling <mikey@neuling.org>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/64ebb9a208c6e66316329a6d910181
cheers
prev parent reply other threads:[~2017-06-29 12:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-15 1:53 [PATCH] powerpc: Fix /proc/cpuinfo revision for POWER9 DD2 Michael Neuling
2017-06-29 12:21 ` Michael Ellerman [this message]
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