> These patches attempt to deal with this in the simplest way possible by > generalising the specific quirk for 32-bit bridges into an arbitrary > mask which can then also be plumbed into the firmware code. In the > interest of being minimally invasive, I've only included a point fix > for the IOMMU issue as seen on arm64 - there may be further tweaks > needed in DMA ops to catch all possible incarnations of this problem, > but this initial RFC is mostly about the impact beyond the dma-mapping > subsystem itself.
Thanks, this looks very nice to me. In fact it probably solves the RISC-V/Xiling problem as well if we can just add the dma-ranges property to the device tree for the affected systems. Palmer, do you know how easily the DT could be updated for that case? > > Robin. > > > [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/580804.html > [2] > http://lists.infradead.org/pipermail/linux-arm-kernel/2016-December/474443.html > > Robin Murphy (4): > dma-mapping: Generalise dma_32bit_limit flag > ACPI/IORT: Set bus DMA mask as appropriate > of/device: Set bus DMA mask as appropriate > iommu/dma: Respect bus DMA limit for IOVAs > > arch/x86/kernel/pci-dma.c | 2 +- > drivers/acpi/arm64/iort.c | 1 + > drivers/iommu/dma-iommu.c | 3 +++ > drivers/of/device.c | 1 + > include/linux/device.h | 6 +++--- > kernel/dma/direct.c | 2 +- > 6 files changed, 10 insertions(+), 5 deletions(-) > > -- > 2.17.1.dirty ---end quoted text--- _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
