[PATCH] Document iommu=panic

Signed-off-by: Andi Kleen <ak@suse.de>
2006-09-30 01:47:55 +02:00 · 2006-09-30 01:47:55 +02:00 · d802ab981d
commit d802ab981d
parent ded318ec80
2 changed files with 2 additions and 0 deletions
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@ -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]

--- a/arch/x86_64/kernel/pci-dma.c
+++ b/arch/x86_64/kernel/pci-dma.c
@ -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)
 {