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authorSuresh Siddha <suresh.b.siddha@intel.com>2009-03-16 17:04:57 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2009-03-17 15:39:58 -0700
commit1531a6a6b81a4e6f9eec9a5608758a6ea14b96e0 (patch)
tree3b1523516192fdd19b286879376b4d3d7c827b0d /drivers/pci/intr_remapping.c
parenteba67e5da6e971993b2899d2cdf459ce77d3dbc5 (diff)
x86, dmar: start with sane state while enabling dma and interrupt-remapping
Impact: cleanup/sanitization Start from a sane state while enabling dma and interrupt-remapping, by clearing the previous recorded faults and disabling previously enabled queued invalidation and interrupt-remapping. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'drivers/pci/intr_remapping.c')
-rw-r--r--drivers/pci/intr_remapping.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 0d202d73a1ac..a84686b2478b 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -499,6 +499,23 @@ int __init enable_intr_remapping(int eim)
struct dmar_drhd_unit *drhd;
int setup = 0;
+ for_each_drhd_unit(drhd) {
+ struct intel_iommu *iommu = drhd->iommu;
+
+ /*
+ * Clear previous faults.
+ */
+ dmar_fault(-1, iommu);
+
+ /*
+ * Disable intr remapping and queued invalidation, if already
+ * enabled prior to OS handover.
+ */
+ disable_intr_remapping(iommu);
+
+ dmar_disable_qi(iommu);
+ }
+
/*
* check for the Interrupt-remapping support
*/