powerpc/prom: Increase RMA size to 512MB
diff mbox

Message ID 20170330040349.GA31756@us.ibm.com
State Accepted
Headers show

Commit Message

Sukadev Bhattiprolu March 30, 2017, 4:03 a.m. UTC
From 3ae8d1ed31b01b92b172fe20e4560cfbfab135ec Mon Sep 17 00:00:00 2001
From: root <root@furatripa-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@in.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---
 arch/powerpc/kernel/prom_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Michael Ellerman April 6, 2017, 1:06 p.m. UTC | #1
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@furatripa-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@in.ibm.com>
> Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>

Applied to powerpc next, thanks.

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

cheers

Patch
diff mbox

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) */