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| /freebsd-11-stable/sys/x86/x86/ | ||
| H A D | busdma_bounce.c | diff 239008 Fri Aug 03 11:54:41 MDT 2012 jhb Improve the handling of static DMA buffers that use non-default memory attributes (currently just BUS_DMA_NOCACHE): - Don't call pmap_change_attr() on the returned address, instead use kmem_alloc_contig() to ask the VM system for memory with the requested attribute. - As a result, always use kmem_alloc_contig() for non-default memory attributes, even for sub-page allocations. This requires adjusting bus_dmamem_free()'s logic for determining which free routine to use. - For x86, add a new dummy bus_dmamap that is used for static DMA buffers allocated via kmem_alloc_contig(). bus_dmamem_free() can then use the map pointer to determine which free routine to use. - For powerpc, add a new flag to the allocated map (bus_dmamem_alloc() always creates a real map on powerpc) to indicate which free routine should be used. Note that the BUS_DMA_NOCACHE handling in powerpc is currently #ifdef'd out. I have left it disabled but updated it to match x86. Reviewed by: scottl MFC after: 1 month |
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