linux-kernel - [098/152] x86, vt-d: Handle previous faults after enabling fault handling

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Date:	Wed, 05 Jan 2011 16:23:17 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Chris Wright <chrisw@...s-sol.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: [098/152] x86, vt-d: Handle previous faults after enabling fault handling

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Suresh Siddha <suresh.b.siddha@...el.com>

commit 7f99d946e71e71d484b7543b49e990508e70d0c0 upstream.

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@...el.com>
LKML-Reference: <20101201062244.630417138@...el.com>
Acked-by: Chris Wright <chrisw@...s-sol.org>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/pci/dmar.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -1414,6 +1414,11 @@ int __init enable_drhd_fault_handling(vo
 			       (unsigned long long)drhd->reg_base_addr, ret);
 			return -1;
 		}
+
+		/*
+		 * Clear any previous faults.
+		 */
+		dmar_fault(iommu->irq, iommu);
 	}

 	return 0;

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