Component Type: kbuild config

Description: Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers

More info: DMA mapping framework by default aligns all buffers to the smallest PAGE_SIZE order which is greater than or equal to the requested buffer size. This works well for buffers up to a few hundreds kilobytes, but for larger buffers it just a waste of address space. Drivers which has relatively small addressing window (like 64Mib) might run out of virtual space with just a few allocations. With this parameter you can specify the maximum PAGE_SIZE order for DMA IOMMU buffers. Larger buffers will be aligned only to this specified order. The order is expressed as a power of two multiplied by the PAGE_SIZE.

Build project: Kconfig (Linux kconfig) (Path: arch\arm\Kconfig )

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