From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
Kevin Tian <kevin.tian@intel.com>, Joerg Roedel <jroedel@suse.de>,
Ashok Raj <ashok.raj@intel.com>,
Zhenyu Wang <zhenyuw@linux.intel.com>,
iommu@lists.linux-foundation.org
Subject: [PATCH AUTOSEL 4.19 329/671] iommu/vt-d: Make kernel parameter igfx_off work with vIOMMU
Date: Thu, 16 Jan 2020 11:59:27 -0500
Message-ID: <20200116170509.12787-66-sashal@kernel.org> (raw)
In-Reply-To: <20200116170509.12787-1-sashal@kernel.org>
From: Lu Baolu <baolu.lu@linux.intel.com>
[ Upstream commit 5daab58043ee2bca861068e2595564828f3bc663 ]
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>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 b9af2419006f..abbbc614c522 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3387,9 +3387,12 @@ 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) {
--
2.20.1
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next parent reply index
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200116170509.12787-1-sashal@kernel.org>
2020-01-16 16:59 ` Sasha Levin [this message]
2020-01-16 17:00 ` [PATCH AUTOSEL 4.19 381/671] iommu: Add missing new line for dma type Sasha Levin
2020-01-16 17:00 ` [PATCH AUTOSEL 4.19 382/671] iommu: Use right function to get group for device Sasha Levin
2020-01-16 17:00 ` [PATCH AUTOSEL 4.19 405/671] iommu/vt-d: Duplicate iommu_resv_region objects per device list Sasha Levin
2020-01-16 17:01 ` [PATCH AUTOSEL 4.19 442/671] iommu/amd: Make iommu_disable safer Sasha Levin
2020-01-16 17:02 ` [PATCH AUTOSEL 4.19 510/671] iommu/mediatek: Fix iova_to_phys PA start for 4GB mode Sasha Levin
2020-01-16 17:03 ` [PATCH AUTOSEL 4.19 560/671] iommu/amd: Wait for completion of IOTLB flush in attach_device Sasha Levin
Reply instructions:
You may reply publically to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200116170509.12787-66-sashal@kernel.org \
--to=sashal@kernel.org \
--cc=ashok.raj@intel.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jroedel@suse.de \
--cc=kevin.tian@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=stable@vger.kernel.org \
--cc=zhenyuw@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
IOMMU Archive on lore.kernel.org
Archives are clonable:
git clone --mirror https://lore.kernel.org/linux-iommu/0 linux-iommu/git/0.git
# If you have public-inbox 1.1+ installed, you may
# initialize and index your mirror using the following commands:
public-inbox-init -V2 linux-iommu linux-iommu/ https://lore.kernel.org/linux-iommu \
iommu@lists.linux-foundation.org
public-inbox-index linux-iommu
Example config snippet for mirrors
Newsgroup available over NNTP:
nntp://nntp.lore.kernel.org/org.linux-foundation.lists.iommu
AGPL code for this site: git clone https://public-inbox.org/public-inbox.git