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From patchwork Thu Mar 30 04:03:49 2017
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: powerpc/prom: Increase RMA size to 512MB
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From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
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X-Patchwork-Id: 745044
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Message-Id: <20170330040349.GA31756@us.ibm.com>
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To: Michael Ellerman <mpe@ellerman.id.au>
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Cc: praveen.pandey@in.ibm.com, linuxppc-dev@lists.ozlabs.org,
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linux-kernel@vger.kernel.org
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Date: Wed, 29 Mar 2017 21:03:49 -0700
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>From 3ae8d1ed31b01b92b172fe20e4560cfbfab135ec Mon Sep 17 00:00:00 2001
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From: root <root@furatripa-lp2.aus.stglabs.ibm.com>
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Date: Mon, 27 Mar 2017 19:43:14 -0400
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Subject: [PATCH] powerpc/prom: Increase RMA size to 512MB
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When booting very large systems with a large initrd, we run out of
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space for either the RTAS or the flattened device tree (FDT). Boot
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fails with messages like:
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Could not allocate memory for RTAS
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or
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No memory for flatten_device_tree (no room)
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Increasing the minimum RMA size to 512MB fixes the problem. This
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should not have an impact on smaller LPARs (with 256MB memory),
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as the firmware will cap the RMA to the memory assigned to the LPAR.
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Fix is based on input/discussions with Michael Ellerman. Thanks to
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Praveen K. Pandey for testing on a large system.
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Reported-by: Praveen K. Pandey <preveen.pandey@in.ibm.com>
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Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
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---
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arch/powerpc/kernel/prom_init.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
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index 1c1b44e..dd8a04f 100644
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--- a/arch/powerpc/kernel/prom_init.c
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+++ b/arch/powerpc/kernel/prom_init.c
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@@ -815,7 +815,7 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
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.virt_base = cpu_to_be32(0xffffffff),
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.virt_size = cpu_to_be32(0xffffffff),
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.load_base = cpu_to_be32(0xffffffff),
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- .min_rma = cpu_to_be32(256), /* 256MB min RMA */
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+ .min_rma = cpu_to_be32(512), /* 512MB min RMA */
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.min_load = cpu_to_be32(0xffffffff), /* full client load */
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.min_rma_percent = 0, /* min RMA percentage of total RAM */
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.max_pft_size = 48, /* max log_2(hash table size) */
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