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[PATCH] Document iommu=panic

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Signed-off-by: Andi Kleen <ak@suse.de>
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Andi Kleen 2006-09-30 01:47:55 +02:00 committed by Andi Kleen
parent ded318ec80
commit d802ab981d
2 changed files with 2 additions and 0 deletions
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Documentation/x86_64/boot-options.txt
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@ -203,6 +203,7 @@ IOMMU
When off all DMA over >4GB is forced through an IOMMU or bounce When off all DMA over >4GB is forced through an IOMMU or bounce
buffering. buffering.
nodac Forbid DMA >4GB nodac Forbid DMA >4GB
panic Always panic when IOMMU overflows
swiotlb=pages[,force] swiotlb=pages[,force]

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arch/x86_64/kernel/pci-dma.c
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@ -245,6 +245,7 @@ EXPORT_SYMBOL(dma_set_mask);
noaperture Don't touch the aperture for AGP. noaperture Don't touch the aperture for AGP.
allowdac Allow DMA >4GB allowdac Allow DMA >4GB
nodac Forbid DMA >4GB nodac Forbid DMA >4GB
panic Force panic when IOMMU overflows
*/ */
__init int iommu_setup(char *p) __init int iommu_setup(char *p)
{ {