linux-kernel - [PATCH 3/3] x86/amd-iommu: Export cache-coherency capability

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Message-ID: <1280249030-21332-4-git-send-email-joerg.roedel@amd.com>
Date:	Tue, 27 Jul 2010 18:43:50 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...e.hu>, <x86@...nel.org>
CC:	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 3/3] x86/amd-iommu: Export cache-coherency capability

This patch exports the capability of the AMD IOMMU to force
cache coherency of DMA transactions through the IOMMU-API.
This is required to disable some nasty hacks in KVM when
this capability is not available.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/amd_iommu.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 29dd3b9..fa044e1 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -2572,6 +2572,11 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
 static int amd_iommu_domain_has_cap(struct iommu_domain *domain,
 				    unsigned long cap)
 {
+	switch (cap) {
+	case IOMMU_CAP_CACHE_COHERENCY:
+		return 1;
+	}
+
 	return 0;
 }
 
-- 
1.7.0.4


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