linux-kernel - [PATCH v2 1/6] sparc64: Add FORCE_MAX

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Date:   Thu, 27 Oct 2016 17:23:27 -0700
From:   Tushar Dave <tushar.n.dave@...cle.com>
To:     davem@...emloft.net, chris.hyser@...cle.com,
        sowmini.varadhan@...cle.com, vgupta@...opsys.com, jroedel@...e.de,
        egtvedt@...fundet.no, robin.murphy@....com,
        m.szyprowski@...sung.com, krzk@...nel.org,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 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 b23c76b..5202eb4 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -89,6 +89,10 @@ 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
@@ -304,6 +308,20 @@ 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