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menuconfig ION
bool "Ion Memory Manager"
depends on HAVE_MEMBLOCK
select GENERIC_ALLOCATOR
select DMA_SHARED_BUFFER
---help---
Chose this option to enable the ION Memory Manager,
used by Android to efficiently allocate buffers
from userspace that can be shared between drivers.
If you're not using Android its probably safe to
say N here.
config ION_TEST
tristate "Ion Test Device"
depends on ION
help
Choose this option to create a device that can be used to test the
kernel and device side ION functions.
config ION_DUMMY
bool "Dummy Ion driver"
depends on ION
help
Provides a dummy ION driver that registers the
/dev/ion device and some basic heaps. This can
be used for testing the ION infrastructure if
one doesn't have access to hardware drivers that
use ION.
config ION_TEGRA
tristate "Ion for Tegra"
depends on ARCH_TEGRA && ION
help
Choose this option if you wish to use ion on an nVidia Tegra.
config ION_JUNO
bool "Ion for Juno board"
depends on ION
help
ION support for arm juno reference board.
config ION_COMPOUND_PAGE
bool "Ion compound page system pool"
depends on ION
help
Enable use of compound pages (default to 2MB) system memory pool.
Backs a buffer with large and aligned pages where possible,
to ease TLB pressure and lessen memory fragmentation.
config ION_COMPOUND_PAGE_SIZE
int "Compound page size, shift amount (9 => 2MB, 10 => 4MB)"
depends on ION_COMPOUND_PAGE
range 1 20
default 9
help
Size of the compound pages to use, when possible.
Typically this is set to match the size needed by IOMMUs on the system.
The number is the page shift amount, so 1 means shift by one,
aka 2 times the page size.
config ION_COMPOUND_PAGE_LOWMARK
int "Compound page lowmark"
depends on ION_COMPOUND_PAGE
range 2 256
default 16
help
Memory refill will be triggered if the number of pages in the free pool goes below this
config ION_COMPOUND_PAGE_FILLMARK
int "Compound page fillmark"
depends on ION_COMPOUND_PAGE
range 2 512
default 32
help
Amount of pages memory refill will target
config ION_COMPOUND_PAGE_HIGHMARK
int "Compound page highmark"
depends on ION_COMPOUND_PAGE
range 2 1024
default 128
help
Maximum number of pages to keep in the free pool
config ION_COMPOUND_PAGE_STATS
bool "Collect statistics for the compound page pool"
depends on ION_COMPOUND_PAGE && DEBUG_FS
help
Collect extra usage statistics for the compound page pool.
Available via ion's debugfs entry for the pool.
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