From patchwork Thu Mar 30 04:03:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: powerpc/prom: Increase RMA size to 512MB From: Sukadev Bhattiprolu X-Patchwork-Id: 745044 Message-Id: <20170330040349.GA31756@us.ibm.com> To: Michael Ellerman Cc: praveen.pandey@in.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Date: Wed, 29 Mar 2017 21:03:49 -0700 >From 3ae8d1ed31b01b92b172fe20e4560cfbfab135ec Mon Sep 17 00:00:00 2001 From: root 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 Signed-off-by: Sukadev Bhattiprolu --- arch/powerpc/kernel/prom_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index 1c1b44e..dd8a04f 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -815,7 +815,7 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = { .virt_base = cpu_to_be32(0xffffffff), .virt_size = cpu_to_be32(0xffffffff), .load_base = cpu_to_be32(0xffffffff), - .min_rma = cpu_to_be32(256), /* 256MB min RMA */ + .min_rma = cpu_to_be32(512), /* 512MB min RMA */ .min_load = cpu_to_be32(0xffffffff), /* full client load */ .min_rma_percent = 0, /* min RMA percentage of total RAM */ .max_pft_size = 48, /* max log_2(hash table size) */