From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, David Woodhouse <dwmw2@infradead.org>
Cc: ashok.raj@intel.com, sanjay.k.kumar@intel.com,
jacob.jun.pan@intel.com, kevin.tian@intel.com,
yi.l.liu@intel.com, yi.y.sun@intel.com, peterx@redhat.com,
Jean-Philippe Brucker <jean-philippe.brucker@arm.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 v2 05/12] iommu/vt-d: Reserve a domain id for FL and PT modes
Date: Thu, 30 Aug 2018 09:35:17 +0800 [thread overview]
Message-ID: <20180830013524.28743-6-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20180830013524.28743-1-baolu.lu@linux.intel.com>
Vt-d spec rev3.0 (section 6.2.3.1) requires that each pasid
entry for first-level or pass-through translation should be
programmed with a domain id different from those used for
second-level or nested translation. It is recommended that
software could use a same domain id for all first-only and
pass-through translations.
This reserves a domain id for first-level and pass-through
translations.
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Cc: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 10 ++++++++++
drivers/iommu/intel-pasid.h | 6 ++++++
2 files changed, 16 insertions(+)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 93cde957adc7..562da10bf93e 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1643,6 +1643,16 @@ static int iommu_init_domains(struct intel_iommu *iommu)
*/
set_bit(0, iommu->domain_ids);
+ /*
+ * Vt-d spec rev3.0 (section 6.2.3.1) requires that each pasid
+ * entry for first-level or pass-through translation modes should
+ * be programmed with a domain id different from those used for
+ * second-level or nested translation. We reserve a domain id for
+ * this purpose.
+ */
+ if (sm_supported(iommu))
+ set_bit(FLPT_DEFAULT_DID, iommu->domain_ids);
+
return 0;
}
diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h
index 12f480c2bb8b..03c1612d173c 100644
--- a/drivers/iommu/intel-pasid.h
+++ b/drivers/iommu/intel-pasid.h
@@ -17,6 +17,12 @@
#define PDE_PFN_MASK PAGE_MASK
#define PASID_PDE_SHIFT 6
+/*
+ * Domain ID reserved for pasid entries programmed for first-level
+ * only and pass-through transfer modes.
+ */
+#define FLPT_DEFAULT_DID 1
+
struct pasid_dir_entry {
u64 val;
};
--
2.17.1
next prev parent reply other threads:[~2018-08-30 1:37 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-30 1:35 [PATCH v2 00/12] iommu/vt-d: Add scalable mode support Lu Baolu
2018-08-30 1:35 ` [PATCH v2 01/12] iommu/vt-d: Enumerate the scalable mode capability Lu Baolu
2018-09-06 1:55 ` Tian, Kevin
2018-09-06 2:25 ` Lu Baolu
2018-08-30 1:35 ` [PATCH v2 02/12] iommu/vt-d: Manage scalalble mode PASID tables Lu Baolu
2018-09-06 2:14 ` Tian, Kevin
2018-09-06 2:46 ` Lu Baolu
2018-09-06 2:52 ` Tian, Kevin
2018-09-06 3:05 ` Lu Baolu
2018-09-06 23:43 ` Jacob Pan
2018-09-07 1:57 ` Lu Baolu
2018-08-30 1:35 ` [PATCH v2 03/12] iommu/vt-d: Move page table helpers into header Lu Baolu
2018-09-06 2:15 ` Tian, Kevin
2018-09-06 2:52 ` Lu Baolu
2018-08-30 1:35 ` [PATCH v2 04/12] iommu/vt-d: Add 256-bit invalidation descriptor support Lu Baolu
2018-09-06 2:39 ` Tian, Kevin
2018-09-07 2:11 ` Lu Baolu
2018-08-30 1:35 ` Lu Baolu [this message]
2018-08-30 1:35 ` [PATCH v2 06/12] iommu/vt-d: Add second level page table interface Lu Baolu
2018-09-06 3:11 ` Tian, Kevin
2018-09-07 2:47 ` Lu Baolu
2018-09-07 17:43 ` Raj, Ashok
2018-09-13 5:52 ` Tian, Kevin
2018-08-30 1:35 ` [PATCH v2 07/12] iommu/vt-d: Setup pasid entry for RID2PASID support Lu Baolu
2018-08-30 1:35 ` [PATCH v2 08/12] iommu/vt-d: Pass pasid table to context mapping Lu Baolu
2018-09-06 3:17 ` Tian, Kevin
2018-09-07 2:13 ` Lu Baolu
2018-08-30 1:35 ` [PATCH v2 09/12] iommu/vt-d: Setup context and enable RID2PASID support Lu Baolu
2018-08-30 1:35 ` [PATCH v2 10/12] iommu/vt-d: Add first level page table interface Lu Baolu
2018-08-30 1:35 ` [PATCH v2 11/12] iommu/vt-d: Shared virtual address in scalable mode Lu Baolu
2018-08-30 1:35 ` [PATCH v2 12/12] iommu/vt-d: Remove deferred invalidation Lu Baolu
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