[PATCH v3 15/22] iommu/amd: Add helper functions to manage DevID / DomID mapping tables

[Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>]

Introduce amd_viommu_init_one() and amd_viommu_uninit_one().
These functions are called during IOMMUFD vIOMMU initialize and destroy.
Currently, it manages the IPA mapping for Device ID and Domain ID mapping
tables.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 drivers/iommu/amd/amd_iommu_types.h |  3 ++
 drivers/iommu/amd/amd_viommu.h      | 13 ++++++++
 drivers/iommu/amd/iommu.c           |  1 +
 drivers/iommu/amd/iommufd.c         |  5 +++
 drivers/iommu/amd/viommu.c          | 52 +++++++++++++++++++++++++++++
 5 files changed, 74 insertions(+)

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 340929ae776a..03346258e2dc 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -549,6 +549,9 @@ struct amd_iommu_viommu {
 	 */
 	struct xarray gdomid_array;
 
+	u64 *devid_table;
+	u64 *domid_table;
+
 	/* Offset for mmap() of guest VF MMIO; set after iommufd_viommu_alloc_mmap(). */
 	unsigned long vfmmio_mmap_offset;
 };
diff --git a/drivers/iommu/amd/amd_viommu.h b/drivers/iommu/amd/amd_viommu.h
index 447692b9101c..8b57717c22a6 100644
--- a/drivers/iommu/amd/amd_viommu.h
+++ b/drivers/iommu/amd/amd_viommu.h
@@ -14,6 +14,10 @@ void __init amd_viommu_uninit(struct amd_iommu *iommu);
 
 u64 amd_viommu_get_vfmmio_addr(struct amd_iommu *iommu, u16 gid);
 
+int amd_viommu_init_one(struct amd_iommu *iommu, struct amd_iommu_viommu *viommu);
+
+void amd_viommu_uninit_one(struct amd_iommu *iommu, struct amd_iommu_viommu *viommu);
+
 #else
 
 static inline int amd_viommu_init(struct amd_iommu *iommu)
@@ -30,6 +34,15 @@ static inline u64 amd_viommu_get_vfmmio_addr(struct amd_iommu *iommu, u16 gid)
 	return 0;
 }
 
+static inline int amd_viommu_init_one(struct amd_iommu *iommu, struct amd_iommu_viommu *viommu)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void amd_viommu_uninit_one(struct amd_iommu *iommu, struct amd_iommu_viommu *viommu)
+{
+}
+
 #endif /* CONFIG_AMD_IOMMU_IOMMUFD */
 
 #endif /* AMD_VIOMMU_H */
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index e5dc34959c6e..3b59938c2f86 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -43,6 +43,7 @@
 #include <linux/generic_pt/iommu.h>
 
 #include "amd_iommu.h"
+#include "amd_viommu.h"
 #include "iommufd.h"
 #include "../irq_remapping.h"
 #include "../iommu-pages.h"
diff --git a/drivers/iommu/amd/iommufd.c b/drivers/iommu/amd/iommufd.c
index 81e0244348a2..bfc4b0ec22a9 100644
--- a/drivers/iommu/amd/iommufd.c
+++ b/drivers/iommu/amd/iommufd.c
@@ -83,6 +83,10 @@ int amd_iommufd_viommu_init(struct iommufd_viommu *viommu, struct iommu_domain *
 	/* Reset vIOMMU MMIOs to initialize the vIOMMU */
 	iommu_reset_vmmio(iommu, aviommu->gid);
 
+	ret = amd_viommu_init_one(iommu, aviommu);
+	if (ret)
+		goto err_init;
+
 	ret = iommu_copy_struct_to_user(user_data, &data,
 					IOMMU_VIOMMU_TYPE_AMD,
 					out_vfmmio_mmap_offset);
@@ -118,6 +122,7 @@ static void amd_iommufd_viommu_destroy(struct iommufd_viommu *viommu)
 	spin_unlock_irqrestore(&pdom->lock, flags);
 	xa_destroy(&aviommu->gdomid_array);
 	iommufd_viommu_destroy_mmap(&aviommu->core, aviommu->vfmmio_mmap_offset);
+	amd_viommu_uninit_one(iommu, aviommu);
 	amd_iommu_gid_free(iommu, aviommu->gid);
 }
 
diff --git a/drivers/iommu/amd/viommu.c b/drivers/iommu/amd/viommu.c
index 808f0b304006..27b17edb910e 100644
--- a/drivers/iommu/amd/viommu.c
+++ b/drivers/iommu/amd/viommu.c
@@ -26,6 +26,20 @@
 #include "amd_viommu.h"
 #include "../iommu-pages.h"
 
+/*
+ * Guest Device ID Mapping Table
+ */
+#define VIOMMU_MAX_GDEVID	0xFFFF
+#define VIOMMU_DEVID_MAPPING_BASE	0x1000000000ULL
+#define VIOMMU_DEVID_MAPPING_ENTRY_SIZE	(1 << 20)
+
+/*
+ * Guest Domain ID Mapping Table
+ */
+#define VIOMMU_MAX_GDOMID	0xFFFF
+#define VIOMMU_DOMID_MAPPING_BASE	0x2000000000ULL
+#define VIOMMU_DOMID_MAPPING_ENTRY_SIZE	(1 << 19)
+
 LIST_HEAD(viommu_devid_map);
 
 static int viommu_init_pci_vsc(struct amd_iommu *iommu)
@@ -412,3 +426,41 @@ static void __maybe_unused free_private_vm_region(struct amd_iommu *iommu, u64 *
 
 	*entry = NULL;
 }
+
+void amd_viommu_uninit_one(struct amd_iommu *iommu, struct amd_iommu_viommu *aviommu)
+{
+	pr_debug("%s: gid=%u\n", __func__, aviommu->gid);
+
+	free_private_vm_region(iommu, &aviommu->devid_table,
+			       VIOMMU_DEVID_MAPPING_BASE,
+			       VIOMMU_DEVID_MAPPING_ENTRY_SIZE,
+			       aviommu->gid);
+	free_private_vm_region(iommu, &aviommu->domid_table,
+			       VIOMMU_DOMID_MAPPING_BASE,
+			       VIOMMU_DOMID_MAPPING_ENTRY_SIZE,
+			       aviommu->gid);
+}
+
+int amd_viommu_init_one(struct amd_iommu *iommu, struct amd_iommu_viommu *viommu)
+{
+	int ret;
+
+	ret = alloc_private_vm_region(iommu, &viommu->devid_table,
+				      VIOMMU_DEVID_MAPPING_BASE,
+				      VIOMMU_DEVID_MAPPING_ENTRY_SIZE,
+				      viommu->gid);
+	if (ret)
+		goto err_out;
+
+	ret = alloc_private_vm_region(iommu, &viommu->domid_table,
+				      VIOMMU_DOMID_MAPPING_BASE,
+				      VIOMMU_DOMID_MAPPING_ENTRY_SIZE,
+				      viommu->gid);
+	if (ret)
+		goto err_out;
+
+	return 0;
+err_out:
+	amd_viommu_uninit_one(iommu, viommu);
+	return -ENOMEM;
+}
-- 
2.34.1