linux-kernel - Re: powerpc/prom: Increase RMA size to 512MB

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Message-Id: <3vzNHv1ZFfz9s8T@ozlabs.org>
Date:   Thu,  6 Apr 2017 23:06:03 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:     praveen.pandey@...ibm.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: powerpc/prom: Increase RMA size to 512MB

On Thu, 2017-03-30 at 04:03:49 UTC, Sukadev Bhattiprolu wrote:
> >From 3ae8d1ed31b01b92b172fe20e4560cfbfab135ec Mon Sep 17 00:00:00 2001
> From: root <root@...atripa-lp2.aus.stglabs.ibm.com>
> Date: Mon, 27 Mar 2017 19:43:14 -0400
> Subject: [PATCH] powerpc/prom: Increase RMA size to 512MB
> 
> When booting very large systems with a large initrd, we run out of
> space for either the RTAS or the flattened device tree (FDT). Boot
> fails with messages like:
> 
> 	Could not allocate memory for RTAS
> or
> 	No memory for flatten_device_tree (no room)
> 
> Increasing the minimum RMA size to 512MB fixes the problem. This
> should not have an impact on smaller LPARs (with 256MB memory),
> as the firmware will cap the RMA to the memory assigned to the LPAR.
> 
> Fix is based on input/discussions with Michael Ellerman. Thanks to
> Praveen K. Pandey for testing on a large system.
> 
> Reported-by: Praveen K. Pandey <preveen.pandey@...ibm.com>
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/687da8fce1682c9f1e87530e731189

cheers