linux-kernel - [PATCH 1/1] iommu: add a dma remap fault reason.

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Message-Id: <1362537797-6034-1-git-send-email-zhen-hual@hp.com>
Date:	Wed,  6 Mar 2013 10:43:17 +0800
From:	"Li, Zhen-Hua" <zhen-hual@...com>
To:	<linux-kernel@...r.kernel.org>, Joerg Roedel <joro@...tes.org>,
	Ingo Molnar <mingo@...nel.org>,
	Donald Dutile <ddutile@...hat.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Hannes Reinecke <hare@...e.de>
Cc:	"Li, Zhen-Hua" <zhen-hual@...com>
Subject: [PATCH 1/1] iommu: add a dma remap fault reason.

The number of dma fault reasons in intel's document are from 1 to 0xD, but in dmar.c I cannot find fault reason 0xD.

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).

So I think 0xD should be added.

Signed-off-by: Li, Zhen-Hua <zhen-hual@...com>
---
 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[] =
-- 
1.7.10.4

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