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Message-Id: <1475796816-14448-2-git-send-email-tushar.n.dave@oracle.com>
Date: Thu, 6 Oct 2016 16:33:31 -0700
From: Tushar Dave <tushar.n.dave@...cle.com>
To: davem@...emloft.net, chris.hyser@...cle.com,
sowmini.varadhan@...cle.com, vgupta@...opsys.com,
robin.murphy@....com, jroedel@...e.de, egtvedt@...fundet.no,
krzk@...nel.org, sparclinux@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH 1/6] sparc64: Add FORCE_MAX_ZONEORDER and default to 13
From: Dave Kleikamp <dave.kleikamp@...cle.com>
This change allows ATU (new IOMMU) in SPARC systems to request
large (32M) contiguous memory during boot for creating IOTSB backing
store.
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Signed-off-by: Tushar Dave <tushar.n.dave@...cle.com>
---
arch/sparc/Kconfig | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 59b0960..338282d 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -91,6 +91,10 @@ config ARCH_DEFCONFIG
config ARCH_PROC_KCORE_TEXT
def_bool y
+config ARCH_ATU
+ bool
+ default y if SPARC64
+
config IOMMU_HELPER
bool
default y if SPARC64
@@ -306,6 +310,20 @@ config ARCH_SPARSEMEM_ENABLE
config ARCH_SPARSEMEM_DEFAULT
def_bool y if SPARC64
+config FORCE_MAX_ZONEORDER
+ int "Maximum zone order"
+ default "13"
+ help
+ The kernel memory allocator divides physically contiguous memory
+ blocks into "zones", where each zone is a power of two number of
+ pages. This option selects the largest power of two that the kernel
+ keeps in the memory allocator. If you need to allocate very large
+ blocks of physically contiguous memory, then you may need to
+ increase this value.
+
+ This config option is actually maximum order plus one. For example,
+ a value of 13 means that the largest free memory block is 2^12 pages.
+
source "mm/Kconfig"
if SPARC64
--
1.9.1
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