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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

Documentation/x86_64/boot-options.txt

+1 −0
Original line number Diff line number Diff line
@@ -203,6 +203,7 @@ IOMMU 
	    When off all DMA over >4GB is forced through an IOMMU or bounce

	    buffering.

   nodac    Forbid DMA >4GB

   panic    Always panic when IOMMU overflows



  swiotlb=pages[,force]

arch/x86_64/kernel/pci-dma.c

+1 −0
Original line number Diff line number Diff line
@@ -245,6 +245,7 @@ EXPORT_SYMBOL(dma_set_mask); 
   noaperture Don't touch the aperture for AGP.

   allowdac Allow DMA >4GB

   nodac    Forbid DMA >4GB

   panic    Force panic when IOMMU overflows

*/

__init int iommu_setup(char *p)

{