On Thu, Dec 13, 2018 at 05:17:17PM +1100, Alexey Kardashevskiy wrote: > This new memory does not have page structs as it is not plugged to > the host so gup() will fail anyway. > > This adds 2 helpers: > - mm_iommu_newdev() to preregister the "memory device" memory so > the rest of API can still be used; > - mm_iommu_is_devmem() to know if the physical address is one of thise > new regions which we must avoid unpinning of. > > This adds @mm to tce_page_is_contained() and iommu_tce_xchg() to test > if the memory is device memory to avoid pfn_to_page(). > > This adds a check for device memory in mm_iommu_ua_mark_dirty_rm() which > does delayed pages dirtying. > > Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx> Reviewed-by: Paul Mackerras <paulus@xxxxxxxxxx>
