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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, Jason Gunthorpe <jgg@nvidia.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Kevin Tian <kevin.tian@intel.com>
Cc: Jacob jun Pan <jacob.jun.pan@intel.com>,
	Liu Yi L <yi.l.liu@intel.com>,
	iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
	Lu Baolu <baolu.lu@linux.intel.com>
Subject: [PATCH v3 1/4] iommu/vt-d: Block force-snoop domain attaching if no SC support
Date: Fri,  6 May 2022 13:27:24 +0800	[thread overview]
Message-ID: <20220506052727.1689687-2-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20220506052727.1689687-1-baolu.lu@linux.intel.com>

In the attach_dev callback of the default domain ops, if the domain has
been set force_snooping, but the iommu hardware of the device does not
support SC(Snoop Control) capability, the callback should block it and
return a corresponding error code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
---
 drivers/iommu/intel/iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 2990f80c5e08..b4802f4055a0 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4367,6 +4367,9 @@ static int prepare_domain_attach_device(struct iommu_domain *domain,
 	if (!iommu)
 		return -ENODEV;
 
+	if (dmar_domain->force_snooping && !ecap_sc_support(iommu->ecap))
+		return -EOPNOTSUPP;
+
 	/* check if this iommu agaw is sufficient for max mapped address */
 	addr_width = agaw_to_width(iommu->agaw);
 	if (addr_width > cap_mgaw(iommu->cap))
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, Jason Gunthorpe <jgg@nvidia.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Kevin Tian <kevin.tian@intel.com>
Cc: iommu@lists.linux-foundation.org,
	Jacob jun Pan <jacob.jun.pan@intel.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH v3 1/4] iommu/vt-d: Block force-snoop domain attaching if no SC support
Date: Fri,  6 May 2022 13:27:24 +0800	[thread overview]
Message-ID: <20220506052727.1689687-2-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20220506052727.1689687-1-baolu.lu@linux.intel.com>

In the attach_dev callback of the default domain ops, if the domain has
been set force_snooping, but the iommu hardware of the device does not
support SC(Snoop Control) capability, the callback should block it and
return a corresponding error code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
---
 drivers/iommu/intel/iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 2990f80c5e08..b4802f4055a0 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4367,6 +4367,9 @@ static int prepare_domain_attach_device(struct iommu_domain *domain,
 	if (!iommu)
 		return -ENODEV;
 
+	if (dmar_domain->force_snooping && !ecap_sc_support(iommu->ecap))
+		return -EOPNOTSUPP;
+
 	/* check if this iommu agaw is sufficient for max mapped address */
 	addr_width = agaw_to_width(iommu->agaw);
 	if (addr_width > cap_mgaw(iommu->cap))
-- 
2.25.1

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2022-05-06  5:31 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-06  5:27 [PATCH v3 0/4] iommu/vt-d: Force snooping improvement Lu Baolu
2022-05-06  5:27 ` Lu Baolu
2022-05-06  5:27 ` Lu Baolu [this message]
2022-05-06  5:27   ` [PATCH v3 1/4] iommu/vt-d: Block force-snoop domain attaching if no SC support Lu Baolu
2022-05-06  5:27 ` [PATCH v3 2/4] iommu/vt-d: Check domain force_snooping against attached devices Lu Baolu
2022-05-06  5:27   ` Lu Baolu
2022-05-06  6:10   ` Tian, Kevin
2022-05-06  6:10     ` Tian, Kevin
2022-05-06  7:41     ` Baolu Lu
2022-05-06  7:41       ` Baolu Lu
2022-05-06  5:27 ` [PATCH v3 3/4] iommu/vt-d: Remove domain_update_iommu_snooping() Lu Baolu
2022-05-06  5:27   ` Lu Baolu
2022-05-06  5:27 ` [PATCH v3 4/4] iommu/vt-d: Remove hard coding PGSNP bit in PASID entries Lu Baolu
2022-05-06  5:27   ` Lu Baolu

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