[PATCH v6 07/12] iommu/vt-d: Setup pasid entry for RID2PASID support

Lu Baolu
2018-12-10T01:59:01Z

when the scalable mode is enabled, there is no second level
page translation pointer in the context entry any more (for
DMA request without PASID). Instead, a new RID2PASID field
is introduced in the context entry. Software can choose any
PASID value to set RID2PASID and then setup the translation
in the corresponding PASID entry. Upon receiving a DMA request
without PASID, hardware will firstly look at this RID2PASID
field and then treat this request as a request with a pasid
value specified in RID2PASID field.

Though software is allowed to use any PASID for the RID2PASID,
we will always use the PASID 0 as a sort of design decision.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
---
drivers/iommu/intel-iommu.c | 20 ++++++++++++++++++++
drivers/iommu/intel-pasid.h | 1 +
2 files changed, 21 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index e741238e2326..a077ff3f67a6 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2462,6 +2462,22 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
dmar_remove_one_dev_info(domain, dev);
return NULL;
}
+
+ /* Setup the PASID entry for requests without PASID: */
+ spin_lock(&iommu->lock);
+ if (hw_pass_through && domain_type_is_si(domain))
+ ret = intel_pasid_setup_pass_through(iommu, domain,
+ dev, PASID_RID2PASID);
+ else
+ ret = intel_pasid_setup_second_level(iommu, domain,
+ dev, PASID_RID2PASID);
+ spin_unlock(&iommu->lock);
+ if (ret) {
+ pr_err("Setup RID2PASID for %s failed\n",
+ dev_name(dev));
+ dmar_remove_one_dev_info(domain, dev);
+ return NULL;
+ }
}

if (dev && domain_context_mapping(domain, dev)) {
@@ -4825,6 +4841,10 @@ static void __dmar_remove_one_dev_info(struct device_domain_info *info)
iommu = info->iommu;

if (info->dev) {
+ if (dev_is_pci(info->dev) && sm_supported(iommu))
+ intel_pasid_tear_down_entry(iommu, info->dev,
+ PASID_RID2PASID);
+
iommu_disable_dev_iotlb(info);
domain_context_clear(iommu, info->dev);
intel_pasid_free_table(info->dev);
diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h
index 3c70522091d3..d6f4fead4491 100644
--- a/drivers/iommu/intel-pasid.h
+++ b/drivers/iommu/intel-pasid.h
@@ -10,6 +10,7 @@
#ifndef __INTEL_PASID_H
#define __INTEL_PASID_H

+#define PASID_RID2PASID 0x0
#define PASID_MIN 0x1
#define PASID_MAX 0x100000
#define PASID_PTE_MASK 0x3F
--
2.17.1