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27 # need to enable this.
85 to allocate big physically-contiguous blocks of memory for use with
105 default, but it can be enabled by passing cma=size[MG] to the kernel.
117 enabled by passing cma=size[MG] to the kernel.
142 DMA mapping framework by default aligns all buffers to the smallest
143 PAGE_SIZE order which is greater than or equal to the requested buffer
144 size. This works well for buffers up to a few hundreds kilobytes, but
147 buffers will be aligned only to this specified order. The order is
150 For example, if your system defaults to 4KiB pages, the order value
151 of 8 means that the buffers will be aligned up to 1MiB only.
161 Enable this option to debug the use of the DMA API by device drivers.
162 With this option you will be able to detect common bugs in device
166 This also attempts to catch cases where a page owned by DMA is
168 example, this enables cow_user_page() to check that the source page is
171 This option causes a performance degradation. Use only if you want to
185 This is particularly likely to have been overlooked in cases where the