On Mon, Oct 8, 2018 at 1:04 AM Christoph Hellwig <h...@lst.de> wrote: > > No need to duplicate the code - map_sg is equivalent to map_page > for each page in the scatterlist. > > Signed-off-by: Christoph Hellwig <h...@lst.de> > --- > kernel/dma/swiotlb.c | 34 ++++++++++++---------------------- > 1 file changed, 12 insertions(+), 22 deletions(-)
Hey all, So, I've found this patch seems to break userspace booting on the HiKey960 board. Initially I thought this was an issue with the mali drivers, and have worked w/ the mali team to try to find a solution, but I've since found that booting just the upstream kernel (with no graphics support) will see userland hang/block unless this patch is reverted. When I see the hangs, it seems like the filesystems are stuck or something, as kernel messages still show up and sometimes I can get to a shell, but commands that I run in that shell (like ls) just hang. I don't see any other error messages. Reverting this patch then gets it work. In order to cleanly revert the patch, I have to revert the following set: "arm64: use the generic swiotlb_dma_ops" "swiotlb: add support for non-coherent DMA" "swiotlb: don't dip into swiotlb pool for coherent allocations" "swiotlb: refactor swiotlb_map_page" "swiotlb: use swiotlb_map_page in swiotlb_map_sg_attrs" But at that point if I just re-apply "swiotlb: use swiotlb_map_page in swiotlb_map_sg_attrs", I reproduce the hangs. Any suggestions for how to further debug what might be going wrong would be appreciated! thanks -john _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
