On Sat, Oct 13, 2018 at 10:09:52AM -0400, tedheadster wrote:
> Christoph,
> here is all of the newly patched dmesg output. I also added
> 'aic7xxx.a9c7xxx=verbose' for extra information.
Hi Matthew,
it seems like we do for some reason never actually enable swiotlb
for 32-bit x86. Before my commit the block bounce buffering papered
over that for networking, Please try this patch:
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 661583662430..71c0b01d93b1 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -42,10 +42,8 @@ IOMMU_INIT_FINISH(pci_swiotlb_detect_override,
int __init pci_swiotlb_detect_4gb(void)
{
/* don't initialize swiotlb if iommu=off (no_iommu=1) */
-#ifdef CONFIG_X86_64
if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN)
swiotlb = 1;
-#endif
/*
* If SME is active then swiotlb will be set to 1 so that bounce
