Messages in this thread Patch in this message | | | Date | Sat, 29 Jul 2006 21:42:49 +0200 | From | "Andi Kleen" <> | Subject | [PATCH for 2.6.18] [6/8] x86_64: Fix swiotlb=force |
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It was broken before. But having it is important as possible hardware bug workaround.
And previously there was no way to force swiotlb if there is another IOMMU. Side effect is that iommu=force won't force swiotlb anymore even if there isn't another IOMMU.
Signed-off-by: Andi Kleen <ak@suse.de>
--- arch/x86_64/kernel/pci-swiotlb.c | 5 +++-- include/asm-x86_64/swiotlb.h | 2 ++ 2 files changed, 5 insertions(+), 2 deletions(-)
Index: linux-2.6.18-rc2-git7/arch/x86_64/kernel/pci-swiotlb.c =================================================================== --- linux-2.6.18-rc2-git7.orig/arch/x86_64/kernel/pci-swiotlb.c +++ linux-2.6.18-rc2-git7/arch/x86_64/kernel/pci-swiotlb.c @@ -31,9 +31,10 @@ struct dma_mapping_ops swiotlb_dma_ops = void pci_swiotlb_init(void) { /* don't initialize swiotlb if iommu=off (no_iommu=1) */ - if (!iommu_detected && !no_iommu && - (end_pfn > MAX_DMA32_PFN || force_iommu)) + if (!iommu_detected && !no_iommu && end_pfn > MAX_DMA32_PFN) swiotlb = 1; + if (swiotlb_force) + swiotlb = 1; if (swiotlb) { printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n"); swiotlb_init(); Index: linux-2.6.18-rc2-git7/include/asm-x86_64/swiotlb.h =================================================================== --- linux-2.6.18-rc2-git7.orig/include/asm-x86_64/swiotlb.h +++ linux-2.6.18-rc2-git7/include/asm-x86_64/swiotlb.h @@ -42,6 +42,8 @@ extern void swiotlb_free_coherent (struc extern int swiotlb_dma_supported(struct device *hwdev, u64 mask); extern void swiotlb_init(void); +extern int swiotlb_force; + #ifdef CONFIG_SWIOTLB extern int swiotlb; #else - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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