diff options
| author |   Suresh Siddha <suresh.b.siddha@intel.com> | 2009-03-16 17:04:57 -0700 |
|---|---|---|
| committer |   H. Peter Anvin <hpa@linux.intel.com> | 2009-03-17 15:39:58 -0700 |
| commit | 1531a6a6b81a4e6f9eec9a5608758a6ea14b96e0 (patch) | |
| tree | 3b1523516192fdd19b286879376b4d3d7c827b0d /drivers/pci/intel-iommu.c | |
| parent | x86, dmar: routines for disabling queued invalidation and intr remapping (diff) | |
| download | linux-dev-1531a6a6b81a4e6f9eec9a5608758a6ea14b96e0.tar.xz linux-dev-1531a6a6b81a4e6f9eec9a5608758a6ea14b96e0.zip | |
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/intel-iommu.c')
| -rw-r--r-- | drivers/pci/intel-iommu.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 25fc1df486bb..ef167b8b047d 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -1855,11 +1855,40 @@ static int __init init_dmars(void) } } + /* + * Start from the sane iommu hardware state. + */ for_each_drhd_unit(drhd) { if (drhd->ignored) continue; iommu = drhd->iommu; + + /* + * If the queued invalidation is already initialized by us + * (for example, while enabling interrupt-remapping) then + * we got the things already rolling from a sane state. + */ + if (iommu->qi) + continue; + + /* + * Clear any previous faults. + */ + dmar_fault(-1, iommu); + /* + * Disable queued invalidation if supported and already enabled + * before OS handover. + */ + dmar_disable_qi(iommu); + } + + for_each_drhd_unit(drhd) { + if (drhd->ignored) + continue; + + iommu = drhd->iommu; + if (dmar_enable_qi(iommu)) { /* * Queued Invalidate not enabled, use Register Based |