[PATCH v2 10/12] iommu/vt-d: Add first level page table interface

[Lu Baolu]

This adds the interfaces to setup or tear down the structures
for first level page table translation.

Cc: Ashok Raj <ashok.raj@xxxxxxxxx>
Cc: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Liu Yi L <yi.l.liu@xxxxxxxxx>
Signed-off-by: Sanjay Kumar <sanjay.k.kumar@xxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Reviewed-by: Ashok Raj <ashok.raj@xxxxxxxxx>
---
 drivers/iommu/intel-pasid.c | 89 +++++++++++++++++++++++++++++++++++++
 drivers/iommu/intel-pasid.h |  7 +++
 include/linux/intel-iommu.h |  1 +
 3 files changed, 97 insertions(+)

diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index edcea1d8b9fc..c921426d7b64 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 void
 pasid_based_pasid_cache_invalidation(struct intel_iommu *iommu,
 				     int did, int pasid)
@@ -445,6 +466,74 @@ static void tear_down_one_pasid_entry(struct intel_iommu *iommu,
 		pasid_based_dev_iotlb_cache_invalidation(iommu, dev, pasid);
 }
 
+/*
+ * Set up the scalable mode pasid table entry for first only
+ * translation type.
+ */
+int intel_pasid_setup_first_level(struct intel_iommu *iommu,
+				  struct mm_struct *mm,
+				  struct device *dev,
+				  u16 did, int pasid)
+{
+	struct pasid_entry *pte;
+
+	if (!ecap_flts(iommu->ecap)) {
+		pr_err("No first level translation support on %s\n",
+		       iommu->name);
+		return -EINVAL;
+	}
+
+	pte = intel_pasid_get_entry(dev, pasid);
+	if (WARN_ON(!pte))
+		return -EINVAL;
+
+	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_domain_id(pte, did);
+	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)) {
+		pasid_based_pasid_cache_invalidation(iommu, did, pasid);
+		pasid_based_iotlb_cache_invalidation(iommu, did, pasid);
+	} else {
+		iommu_flush_write_buffer(iommu);
+	}
+
+	return 0;
+}
+
+/*
+ * Tear down the scalable mode pasid table entry for first only
+ * translation type.
+ */
+void intel_pasid_tear_down_first_level(struct intel_iommu *iommu,
+				       struct device *dev,
+				       u16 did, int pasid)
+{
+	tear_down_one_pasid_entry(iommu, dev, did, 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 948cd3a25976..ee5ac3d2ac22 100644
--- a/drivers/iommu/intel-pasid.h
+++ b/drivers/iommu/intel-pasid.h
@@ -51,6 +51,13 @@ 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);
+int intel_pasid_setup_first_level(struct intel_iommu *iommu,
+				  struct mm_struct *mm,
+				  struct device *dev,
+				  u16 did, int pasid);
+void intel_pasid_tear_down_first_level(struct intel_iommu *iommu,
+				       struct device *dev,
+				       u16 did, int pasid);
 int intel_pasid_setup_second_level(struct intel_iommu *iommu,
 				   struct dmar_domain *domain,
 				   struct device *dev, int pasid,
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index b28613b472d6..30e2bbfbbd50 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -116,6 +116,7 @@
  */
 
 #define ecap_smpwc(e)		(((e) >> 48) & 0x1)
+#define ecap_flts(e)		(((e) >> 47) & 0x1)
 #define ecap_slts(e)		(((e) >> 46) & 0x1)
 #define ecap_smts(e)		(((e) >> 43) & 0x1)
 #define ecap_dit(e)		((e >> 41) & 0x1)
-- 
2.17.1