On Mon, 14 Jan 2019 at 19:13, Christoph Hellwig <hch@xxxxxx> wrote: > > Hmm, I wonder if we are not actually using swiotlb in the end, > can you check if your dmesg contains this line or not? > > PCI-DMA: Using software bounce buffering for IO (SWIOTLB) This line does not appear in my dmesg. > > If not I guess we found a bug in swiotlb exit vs is_swiotlb_buffer, > and you can try this patch: > > diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c > index d6361776dc5c..1fb6fd68b9c7 100644 > --- a/kernel/dma/swiotlb.c > +++ b/kernel/dma/swiotlb.c > @@ -378,6 +378,8 @@ void __init swiotlb_exit(void) > memblock_free_late(io_tlb_start, > PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT)); > } > + io_tlb_start = 0; > + io_tlb_end = 0; > io_tlb_nslabs = 0; > max_segment = 0; > } With the patch applied to v5.0-rc2 I can no longer reproduce the issue. _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
