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Commit d802ab98 authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
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[PATCH] Document iommu=panic 

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent ded318ec
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Documentation/x86_64/boot-options.txt
View file @ d802ab98
...@@ -203,6 +203,7 @@ IOMMU ...@@ -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]
......
arch/x86_64/kernel/pci-dma.c
View file @ d802ab98
...@@ -245,6 +245,7 @@ EXPORT_SYMBOL(dma_set_mask); ...@@ -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)
{ {
......
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