menuconfig ION
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tristate "Ion Memory Manager"
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depends on HAVE_MEMBLOCK && HAS_DMA && MMU
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select GENERIC_ALLOCATOR
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select DMA_SHARED_BUFFER
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help
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Choose this option to enable the ION Memory Manager,
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used by Android to efficiently allocate buffers
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from userspace that can be shared between drivers.
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If you're not using Android its probably safe to
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say N here.
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config ION_PROTECTED_HEAP
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bool "Ion protected heap"
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depends on ION
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help
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Choose this option to enable the Ion protected heap. The protected
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heap is backed by pages from the gen pool allocator.
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If in doubt, say Y.
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config ION_SYSTEM_HEAP
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bool "Ion system heap"
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depends on ION
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help
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Choose this option to enable the Ion system heap. The system heap
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is backed by pages from the buddy allocator. If in doubt, say Y.
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config ION_CARVEOUT_HEAP
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bool "Ion carveout heap support"
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depends on ION
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help
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Choose this option to enable carveout heaps with Ion. Carveout heaps
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are backed by memory reserved from the system. Allocation times are
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typically faster at the cost of memory not being used. Unless you
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know your system has these regions, you should say N here.
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config ION_CHUNK_HEAP
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bool "Ion chunk heap support"
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depends on ION
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help
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Choose this option to enable chunk heaps with Ion. This heap is
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similar in function the carveout heap but memory is broken down
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into smaller chunk sizes, typically corresponding to a TLB size.
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Unless you know your system has these regions, you should say N here.
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config ION_CMA_HEAP
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bool "Ion CMA heap support"
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depends on ION && DMA_CMA
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help
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Choose this option to enable CMA heaps with Ion. This heap is backed
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by the Contiguous Memory Allocator (CMA). If your system has these
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regions, you should say Y here.
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config ION_FORCE_DMA_SYNC
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bool "Force ION to always DMA sync buffer memory"
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depends on ION
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help
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Force ION to DMA sync buffer memory when it is allocated and to
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always DMA sync the buffer memory on calls to begin/end cpu
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access. This makes ION DMA sync behavior similar to that of the
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older version of ION.
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We generally don't want to enable this config as it breaks the
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cache maintenance model.
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If you're not sure say N here.
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