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Message-ID: <1302250630-8183-5-git-send-email-joerg.roedel@amd.com>
Date: Fri, 8 Apr 2011 10:17:09 +0200
From: Joerg Roedel <joerg.roedel@....com>
To: <iommu@...ts.linux-foundation.org>,
Jesse Barnes <jbarnes@...tuousgeek.org>
CC: <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 4/5] x86/amd-iommu: Add flag to indicate IOTLB support
This patch adds a flag to the AMD IOMMU driver to indicate
that all IOMMUs present in the system support device IOTLBs.
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
arch/x86/include/asm/amd_iommu_types.h | 2 ++
arch/x86/kernel/amd_iommu_init.c | 4 ++++
2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index f5d184e..cb811c9 100644
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -250,6 +250,8 @@ extern bool amd_iommu_dump;
/* global flag if IOMMUs cache non-present entries */
extern bool amd_iommu_np_cache;
+/* Only true if all IOMMUs support device IOTLBs */
+extern bool amd_iommu_iotlb_sup;
/*
* Make iterating over all IOMMUs easier
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 8848dda..b6c634f 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -137,6 +137,7 @@ int amd_iommus_present;
/* IOMMUs have a non-present cache? */
bool amd_iommu_np_cache __read_mostly;
+bool amd_iommu_iotlb_sup __read_mostly = true;
/*
* The ACPI table parsing functions set this variable on an error
@@ -673,6 +674,9 @@ static void __init init_iommu_from_pci(struct amd_iommu *iommu)
MMIO_GET_LD(range));
iommu->evt_msi_num = MMIO_MSI_NUM(misc);
+ if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
+ amd_iommu_iotlb_sup = false;
+
if (!is_rd890_iommu(iommu->dev))
return;
--
1.7.1
--
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