From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, David Woodhouse <dwmw2@infradead.org>
Cc: ashok.raj@intel.com, jacob.jun.pan@intel.com,
kevin.tian@intel.com, Zhenyu Wang <zhenyuw@linux.intel.com>,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Lu Baolu <baolu.lu@linux.intel.com>,
Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH 2/2] iommu/vt-d: Make kernel parameter igfx_off work with vIOMMU
Date: Thu, 2 May 2019 09:34:26 +0800 [thread overview]
Message-ID: <20190502013426.16989-3-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20190502013426.16989-1-baolu.lu@linux.intel.com>
The kernel parameter igfx_off is used by users to disable
DMA remapping for the Intel integrated graphic device. It
was designed for bare metal cases where a dedicated IOMMU
is used for graphic. This doesn't apply to virtual IOMMU
case where an include-all IOMMU is used. This makes the
kernel parameter work with virtual IOMMU as well.
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Suggested-by: Kevin Tian <kevin.tian@intel.com>
Fixes: c0771df8d5297 ("intel-iommu: Export a flag indicating that the IOMMU is used for iGFX.")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Zhenyu Wang <zhenyuw@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 00ad00193883..e078b13ce3d8 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3415,9 +3415,12 @@ static int __init init_dmars(void)
iommu_identity_mapping |= IDENTMAP_ALL;
#ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA
- iommu_identity_mapping |= IDENTMAP_GFX;
+ dmar_map_gfx = 0;
#endif
+ if (!dmar_map_gfx)
+ iommu_identity_mapping |= IDENTMAP_GFX;
+
check_tylersburg_isoch();
if (iommu_identity_mapping) {
--
2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, David Woodhouse <dwmw2@infradead.org>
Cc: kevin.tian@intel.com, ashok.raj@intel.com,
linux-kernel@vger.kernel.org,
Zhenyu Wang <zhenyuw@linux.intel.com>,
iommu@lists.linux-foundation.org, jacob.jun.pan@intel.com
Subject: [PATCH 2/2] iommu/vt-d: Make kernel parameter igfx_off work with vIOMMU
Date: Thu, 2 May 2019 09:34:26 +0800 [thread overview]
Message-ID: <20190502013426.16989-3-baolu.lu@linux.intel.com> (raw)
Message-ID: <20190502013426.VpB_-CAXdcI73AsVbtveJ0tYKwYbYt5S9-YEfJ8jSN0@z> (raw)
In-Reply-To: <20190502013426.16989-1-baolu.lu@linux.intel.com>
The kernel parameter igfx_off is used by users to disable
DMA remapping for the Intel integrated graphic device. It
was designed for bare metal cases where a dedicated IOMMU
is used for graphic. This doesn't apply to virtual IOMMU
case where an include-all IOMMU is used. This makes the
kernel parameter work with virtual IOMMU as well.
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Suggested-by: Kevin Tian <kevin.tian@intel.com>
Fixes: c0771df8d5297 ("intel-iommu: Export a flag indicating that the IOMMU is used for iGFX.")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Zhenyu Wang <zhenyuw@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 00ad00193883..e078b13ce3d8 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3415,9 +3415,12 @@ static int __init init_dmars(void)
iommu_identity_mapping |= IDENTMAP_ALL;
#ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA
- iommu_identity_mapping |= IDENTMAP_GFX;
+ dmar_map_gfx = 0;
#endif
+ if (!dmar_map_gfx)
+ iommu_identity_mapping |= IDENTMAP_GFX;
+
check_tylersburg_isoch();
if (iommu_identity_mapping) {
--
2.17.1
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2019-05-02 1:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-02 1:34 [PATCH 0/2] iommu/vt-d: Small fixes for 5.2-rc1 Lu Baolu
2019-05-02 1:34 ` Lu Baolu
2019-05-02 1:34 ` [PATCH 1/2] iommu/vt-d: Set intel_iommu_gfx_mapped correctly Lu Baolu
2019-05-02 1:34 ` Lu Baolu
2019-05-02 1:34 ` Lu Baolu [this message]
2019-05-02 1:34 ` [PATCH 2/2] iommu/vt-d: Make kernel parameter igfx_off work with vIOMMU Lu Baolu
2019-05-03 15:31 ` [PATCH 0/2] iommu/vt-d: Small fixes for 5.2-rc1 Joerg Roedel
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