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menuconfig ION
bool "Ion Memory Manager"
depends on HAS_DMA && MMU
select GENERIC_ALLOCATOR
select DMA_SHARED_BUFFER
help
Choose 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_SYSTEM_HEAP
bool "Ion system heap"
depends on ION
help
Choose this option to enable the Ion system heap. The system heap
is backed by pages from the buddy allocator. If in doubt, say Y.
config ION_CARVEOUT_HEAP
bool "Ion carveout heap support"
depends on ION
help
Choose this option to enable carveout heaps with Ion. Carveout heaps
are backed by memory reserved from the system. Allocation times are
typically faster at the cost of memory not being used. Unless you
know your system has these regions, you should say N here.
config ION_CHUNK_HEAP
bool "Ion chunk heap support"
depends on ION
help
Choose this option to enable chunk heaps with Ion. This heap is
similar in function the carveout heap but memory is broken down
into smaller chunk sizes, typically corresponding to a TLB size.
Unless you know your system has these regions, you should say N here.
config ION_CMA_HEAP
bool "Ion CMA heap support"
depends on ION && DMA_CMA
help
Choose this option to enable CMA heaps with Ion. This heap is backed
by the Contiguous Memory Allocator (CMA). If your system has these
regions, you should say Y here.
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