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authorSuresh Siddha <suresh.b.siddha@intel.com>2010-12-01 01:22:29 -0500
committerH. Peter Anvin <hpa@linux.intel.com>2010-12-13 19:53:57 -0500
commit7f99d946e71e71d484b7543b49e990508e70d0c0 (patch)
treee6e05d2fdb03474bf7135adb950de9a6d49519cf /drivers/pci
parent7f7fbf45c6b748074546f7f16b9488ca71de99c1 (diff)
x86, vt-d: Handle previous faults after enabling fault handling
Fault handling is getting enabled after enabling the interrupt-remapping (as the success of interrupt-remapping can affect the apic mode and hence the fault handling mode). Hence there can potentially be some faults between the window of enabling interrupt-remapping in the vt-d and the fault-handling of the vt-d units. Handle any previous faults after enabling the vt-d fault handling. For v2.6.38 cleanup, need to check if we can remove the dmar_fault() in the enable_intr_remapping() and see if we can enable fault handling along with enabling intr-remapping. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <20101201062244.630417138@intel.com> Cc: stable@kernel.org [v2.6.32+] Acked-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/dmar.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 0157708d474d..09933eb9126b 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -1417,6 +1417,11 @@ int __init enable_drhd_fault_handling(void)
1417 (unsigned long long)drhd->reg_base_addr, ret); 1417 (unsigned long long)drhd->reg_base_addr, ret);
1418 return -1; 1418 return -1;
1419 } 1419 }
1420
1421 /*
1422 * Clear any previous faults.
1423 */
1424 dmar_fault(iommu->irq, iommu);
1420 } 1425 }
1421 1426
1422 return 0; 1427 return 0;