On Mon, Jan 16, 2017 at 01:24:55PM +0000, Robin Murphy wrote: > Whilst PCI devices may have 64-bit DMA masks, they still benefit from > using 32-bit addresses wherever possible in order to avoid DAC (PCI) or > longer address packets (PCIe), which may incur a performance overhead. > Implement the same optimisation as other allocators by trying to get a > 32-bit address first, only falling back to the full mask if that fails. > > Signed-off-by: Robin Murphy <robin.mur...@arm.com> > --- > drivers/iommu/dma-iommu.c | 21 +++++++++++++++------ > 1 file changed, 15 insertions(+), 6 deletions(-)
Looks good to me, and has the added benefit of getting PCI ethernet working on Juno when using the SMMU. Unintended side-effect, but: Acked-by: Will Deacon <will.dea...@arm.com> Will _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
