linux-kernel - [tip:x86/urgent] iommu, x86: Add DMA remap fault reason

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Message-ID: <tip-4ecccd9edd5eb4dd185486e6e593c671484691bc@git.kernel.org>
Date:	Wed, 6 Mar 2013 01:03:23 -0800
From:	"tip-bot for Li, Zhen-Hua" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	joro@...tes.org, ddutile@...hat.com, zhen-hual@...com,
	hare@...e.de, suresh.b.siddha@...el.com, tglx@...utronix.de
Subject: [tip:x86/urgent] iommu, x86: Add DMA remap fault reason

Commit-ID:  4ecccd9edd5eb4dd185486e6e593c671484691bc
Gitweb:     http://git.kernel.org/tip/4ecccd9edd5eb4dd185486e6e593c671484691bc
Author:     Li, Zhen-Hua <zhen-hual@...com>
AuthorDate: Wed, 6 Mar 2013 10:43:17 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 6 Mar 2013 09:41:51 +0100

iommu, x86: Add DMA remap fault reason

The number of DMA fault reasons in intel's document are from 1
to 0xD, but in dmar.c fault reason 0xD is not printed out.

In this document:

 "Intel Virtualization Technology for Directed I/O Architecture Specification"
 http://download.intel.com/technology/computing/vptech/Intel(r)_VT_for_Direct_IO.pdf

Chapter 4. Support For Device-IOTLBs

Table 6. Unsuccessful Translated Requests

There is fault reason for 0xD not listed in kernel:

    Present context-entry used to process translation request
    specifies blocking of Translation Requests (Translation Type (T)
    field value not equal to 01b).

This patch adds reason 0xD as well.

Signed-off-by: Li, Zhen-Hua <zhen-hual@...com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Donald Dutile <ddutile@...hat.com>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
Cc: Hannes Reinecke <hare@...e.de>
Link: http://lkml.kernel.org/r/1362537797-6034-1-git-send-email-zhen-hual@hp.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/iommu/dmar.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index dc7e478..e5cdaf8 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -1083,6 +1083,7 @@ static const char *dma_remap_fault_reasons[] =
 	"non-zero reserved fields in RTP",
 	"non-zero reserved fields in CTP",
 	"non-zero reserved fields in PTE",
+	"PCE for translation request specifies blocking",
 };
 
 static const char *irq_remap_fault_reasons[] =
--
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