linux-kernel - [ 083/153] intel/iommu: force writebuffer-flush quirk on Gen 4 Chipsets

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Message-Id: <20130304033715.763611702@decadent.org.uk>
Date:	Mon, 04 Mar 2013 03:38:30 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Daniel Vetter <daniel.vetter@...ll.ch>,
	David Woodhouse <dwmw2@...radead.org>,
	"Sankaran, Rajesh" <rajesh.sankaran@...el.com>
Subject: [ 083/153] intel/iommu: force writebuffer-flush quirk on Gen 4 Chipsets

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Daniel Vetter <daniel.vetter@...ll.ch>

commit 210561ffd72d00eccf12c0131b8024d5436bae95 upstream.

We already have the quirk entry for the mobile platform, but also
reports on some desktop versions. So be paranoid and set it
everywhere.

References: http://www.mail-archive.com/dri-devel@lists.freedesktop.org/msg33138.html
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: "Sankaran, Rajesh" <rajesh.sankaran@...el.com>
Reported-and-tested-by: Mihai Moldovan <ionic@...ic.de>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/iommu/intel-iommu.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4140,13 +4140,19 @@ static void __devinit quirk_iommu_rwbf(s
 {
 	/*
 	 * Mobile 4 Series Chipset neglects to set RWBF capability,
-	 * but needs it:
+	 * but needs it. Same seems to hold for the desktop versions.
 	 */
 	printk(KERN_INFO "DMAR: Forcing write-buffer flush capability\n");
 	rwbf_quirk = 1;
 }
 
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e00, quirk_iommu_rwbf);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e10, quirk_iommu_rwbf);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e20, quirk_iommu_rwbf);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e30, quirk_iommu_rwbf);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e40, quirk_iommu_rwbf);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e90, quirk_iommu_rwbf);
 
 #define GGC 0x52
 #define GGC_MEMORY_SIZE_MASK	(0xf << 8)


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