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43 # need to enable this.
97 # Should be selected if we can mmap non-coherent mappings to userspace.
98 # The only thing that is really required is a way to set an uncached bit
123 to allocate big physically-contiguous blocks of memory for use with
138 Enable this option to get pernuma CMA areas so that devices like
154 default, but it can be enabled by passing cma=size[MG] to the kernel.
166 enabled by passing cma=size[MG] to the kernel.
191 DMA mapping framework by default aligns all buffers to the smallest
192 PAGE_SIZE order which is greater than or equal to the requested buffer
193 size. This works well for buffers up to a few hundreds kilobytes, but
196 buffers will be aligned only to this specified order. The order is
199 For example, if your system defaults to 4KiB pages, the order value
200 of 8 means that the buffers will be aligned up to 1MiB only.
210 Enable this option to debug the use of the DMA API by device drivers.
211 With this option you will be able to detect common bugs in device
215 This option causes a performance degradation. Use only if you want to
229 This is particularly likely to have been overlooked in cases where the