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Subject[PATCH 08/10] iommu/vt-d: Add first level page table interface
Date
This adds an interface to setup the structures for first
level page table translation type.

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>
Signed-off-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
---
drivers/iommu/intel-pasid.c | 65 +++++++++++++++++++++++++++++++++++++++++++++
drivers/iommu/intel-pasid.h | 4 +++
drivers/iommu/intel-svm.c | 1 -
3 files changed, 69 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index da504576..1195c2a 100644
--- a/drivers/iommu/intel-pasid.c
+++ b/drivers/iommu/intel-pasid.c
@@ -10,6 +10,7 @@
#define pr_fmt(fmt) "DMAR: " fmt

#include <linux/bitops.h>
+#include <linux/cpufeature.h>
#include <linux/dmar.h>
#include <linux/intel-iommu.h>
#include <linux/iommu.h>
@@ -377,6 +378,26 @@ static inline void pasid_set_page_snoop(struct pasid_entry *pe, bool value)
pasid_set_bits(&pe->val[1], 1 << 23, value);
}

+/*
+ * Setup the First Level Page table Pointer field (Bit 140~191)
+ * of a scalable mode PASID entry.
+ */
+static inline void
+pasid_set_flptr(struct pasid_entry *pe, u64 value)
+{
+ pasid_set_bits(&pe->val[2], VTD_PAGE_MASK, value);
+}
+
+/*
+ * Setup the First Level Paging Mode field (Bit 130~131) of a
+ * scalable mode PASID entry.
+ */
+static inline void
+pasid_set_flpm(struct pasid_entry *pe, u64 value)
+{
+ pasid_set_bits(&pe->val[2], GENMASK_ULL(3, 2), value << 2);
+}
+
static inline void
flush_pasid_cache(struct intel_iommu *iommu, int did, int pasid)
{
@@ -389,6 +410,50 @@ flush_pasid_cache(struct intel_iommu *iommu, int did, int pasid)
}

/*
+ * Set up the scalable mode pasid table entry for first only
+ * translation type.
+ */
+void intel_pasid_setup_first_level(struct intel_iommu *iommu,
+ struct mm_struct *mm,
+ struct device *dev,
+ int pasid)
+{
+ struct pasid_entry *pte;
+
+ pte = intel_pasid_get_entry(dev, pasid);
+ if (WARN_ON(!pte))
+ return;
+
+ pasid_clear_entry(pte);
+
+ /* Setup the first level page table pointer: */
+ if (mm) {
+ pasid_set_flptr(pte, (u64)__pa(mm->pgd));
+ } else {
+ pasid_set_sre(pte);
+ pasid_set_flptr(pte, (u64)__pa(init_mm.pgd));
+ }
+
+#ifdef CONFIG_X86
+ if (cpu_feature_enabled(X86_FEATURE_LA57))
+ pasid_set_flpm(pte, 1);
+#endif /* CONFIG_X86 */
+
+ pasid_set_address_width(pte, iommu->agaw);
+ pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
+
+ /* Setup Present and PASID Granular Transfer Type: */
+ pasid_set_translation_type(pte, 1);
+ pasid_set_present(pte);
+
+ if (!ecap_coherent(iommu->ecap))
+ clflush_cache_range(pte, sizeof(*pte));
+
+ if (cap_caching_mode(iommu->cap))
+ flush_pasid_cache(iommu, 0, pasid);
+}
+
+/*
* Set up the scalable mode pasid table entry for second only or
* passthrough translation type.
*/
diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h
index 80d4667..518df72 100644
--- a/drivers/iommu/intel-pasid.h
+++ b/drivers/iommu/intel-pasid.h
@@ -45,6 +45,10 @@ struct pasid_table *intel_pasid_get_table(struct device *dev);
int intel_pasid_get_dev_max_id(struct device *dev);
struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid);
void intel_pasid_clear_entry(struct device *dev, int pasid);
+void intel_pasid_setup_first_level(struct intel_iommu *iommu,
+ struct mm_struct *mm,
+ struct device *dev,
+ int pasid);
void intel_pasid_setup_second_level(struct intel_iommu *iommu,
struct dmar_domain *domain,
struct device *dev, int pasid,
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 5d250cf..8d4a911 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -29,7 +29,6 @@
#include "intel-pasid.h"

#define PASID_ENTRY_P BIT_ULL(0)
-#define PASID_ENTRY_FLPM_5LP BIT_ULL(9)
#define PASID_ENTRY_SRE BIT_ULL(11)

static irqreturn_t prq_event_thread(int irq, void *d);
--
2.7.4
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