lkml.org 
[lkml]   [2019]   [Sep]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 4/4] iommu/vt-d: Identify domains using first level page table
Date
This checks whether a domain should use first level page table
for map/unmap. And if so, we should attach the domain to the
device in first level translation mode.

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: Yi Sun <yi.y.sun@linux.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 | 41 ++++++++++++++++++++++++++++++++++---
1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 103480016010..d539e6a6c3dd 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1722,6 +1722,26 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
#endif
}

+/*
+ * Check and return whether first level is used by default for
+ * DMA translation.
+ */
+static bool first_level_by_default(void)
+{
+ struct dmar_drhd_unit *drhd;
+ struct intel_iommu *iommu;
+
+ rcu_read_lock();
+ for_each_active_iommu(iommu, drhd)
+ if (!sm_supported(iommu) ||
+ !ecap_flts(iommu->ecap) ||
+ !cap_caching_mode(iommu->cap))
+ return false;
+ rcu_read_unlock();
+
+ return true;
+}
+
static struct dmar_domain *alloc_domain(int flags)
{
struct dmar_domain *domain;
@@ -1736,6 +1756,9 @@ static struct dmar_domain *alloc_domain(int flags)
domain->has_iotlb_device = false;
INIT_LIST_HEAD(&domain->devices);

+ if (first_level_by_default())
+ domain->flags |= DOMAIN_FLAG_FIRST_LEVEL_TRANS;
+
return domain;
}

@@ -2625,6 +2648,11 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
if (hw_pass_through && domain_type_is_si(domain))
ret = intel_pasid_setup_pass_through(iommu, domain,
dev, PASID_RID2PASID);
+ else if (domain_type_is_flt(domain))
+ ret = intel_pasid_setup_first_level(iommu, dev,
+ domain->pgd, PASID_RID2PASID,
+ domain->iommu_did[iommu->seq_id],
+ PASID_FLAG_SUPERVISOR_MODE);
else
ret = intel_pasid_setup_second_level(iommu, domain,
dev, PASID_RID2PASID);
@@ -5349,8 +5377,14 @@ static int aux_domain_add_dev(struct dmar_domain *domain,
goto attach_failed;

/* Setup the PASID entry for mediated devices: */
- ret = intel_pasid_setup_second_level(iommu, domain, dev,
- domain->default_pasid);
+ if (domain_type_is_flt(domain))
+ ret = intel_pasid_setup_first_level(iommu, dev,
+ domain->pgd, domain->default_pasid,
+ domain->iommu_did[iommu->seq_id],
+ PASID_FLAG_SUPERVISOR_MODE);
+ else
+ ret = intel_pasid_setup_second_level(iommu, domain, dev,
+ domain->default_pasid);
if (ret)
goto table_failed;
spin_unlock(&iommu->lock);
@@ -5583,7 +5617,8 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
int level = 0;
u64 phys = 0;

- if (dmar_domain->flags & DOMAIN_FLAG_LOSE_CHILDREN)
+ if ((dmar_domain->flags & DOMAIN_FLAG_LOSE_CHILDREN) ||
+ (dmar_domain->flags & DOMAIN_FLAG_FIRST_LEVEL_TRANS))
return 0;

pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level);
--
2.17.1
\
 
 \ /
  Last update: 2019-09-23 14:28    [W:0.217 / U:10.944 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site