[PATCH v3 1/6] sparc64: Add FORCE_MAX_ZONEORDER and default to 13

[Tushar Dave]

From: Dave Kleikamp 

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 
Signed-off-by: Tushar Dave 
---
 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

[PATCH v3 1/6] sparc64: Add FORCE_MAX_ZONEORDER and default to 13

[Tushar Dave]

From: Dave Kleikamp 

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 
Signed-off-by: Tushar Dave 
---
 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