From 3460a6d9cef9ac2aa997da7eff7ff1c8291b361c Mon Sep 17 00:00:00 2001 From: "Keshavamurthy, Anil S" Date: Sun, 21 Oct 2007 16:41:54 -0700 Subject: Intel IOMMU: DMAR fault handling support MSI interrupt handler registrations and fault handling support for Intel-IOMMU hadrware. This patch enables the MSI interrupts for the DMA remapping units and in the interrupt handler read the fault cause and outputs the same on to the console. Signed-off-by: Anil S Keshavamurthy Cc: Andi Kleen Cc: Peter Zijlstra Cc: Muli Ben-Yehuda Cc: "Siddha, Suresh B" Cc: Arjan van de Ven Cc: Ashok Raj Cc: "David S. Miller" Cc: Christoph Lameter Cc: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/Intel-IOMMU.txt | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'Documentation/Intel-IOMMU.txt') diff --git a/Documentation/Intel-IOMMU.txt b/Documentation/Intel-IOMMU.txt index cbb4dbaef761..aba7722c2935 100644 --- a/Documentation/Intel-IOMMU.txt +++ b/Documentation/Intel-IOMMU.txt @@ -63,6 +63,15 @@ Interrupt ranges are not address translated, (0xfee00000 - 0xfeefffff). The same is true for peer to peer transactions. Hence we reserve the address from PCI MMIO ranges so they are not allocated for IOVA addresses. + +Fault reporting +--------------- +When errors are reported, the DMA engine signals via an interrupt. The fault +reason and device that caused it with fault reason is printed on console. + +See below for sample. + + Boot Message Sample ------------------- @@ -85,6 +94,14 @@ When DMAR is enabled for use, you will notice.. PCI-DMA: Using DMAR IOMMU +Fault reporting +--------------- + +DMAR:[DMA Write] Request device [00:02.0] fault addr 6df084000 +DMAR:[fault reason 05] PTE Write access is not set +DMAR:[DMA Write] Request device [00:02.0] fault addr 6df084000 +DMAR:[fault reason 05] PTE Write access is not set + TBD ---- -- cgit v1.2.3-59-g8ed1b