Messages in this thread | | | Subject | Re: [PATCH] x86: enable swiotlb for > 4GiG ram on 32-bit kernels | From | Konrad Rzeszutek Wilk <> | Date | Mon, 15 Oct 2018 14:52:04 -0400 |
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On 10/14/18 3:52 AM, Christoph Hellwig wrote: > We already build the swiotlb code for 32b-t kernels with PAE support, > but the code to actually use swiotlb has only been enabled for 64-bit > kernel for an unknown reason. > > Before Linux 4.18 we papers over this fact because the networking code, > the scsi layer and some random block drivers implenented their own > bounce buffering scheme. > > Fixes: 21e07dba ("scsi: reduce use of block bounce buffers") > Fixes: ab74cfeb ("net: remove the PCI_DMA_BUS_IS_PHYS check in illegal_highdma") > Reported-by: tedheadster <tedheadster@gmail.com> > Tested-by: tedheadster <tedheadster@gmail.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
But since it is already in 'tip' feel free to ignore my tag.
Thanks! > --- > arch/x86/kernel/pci-swiotlb.c | 2 -- > 1 file changed, 2 deletions(-) > > 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 >
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