[RFC v1 2/8] asm-generic/hyperv: add device domain definitions

[Wei Liu <wei.liu@kernel.org>]

These definitions are for the IOMMU device domain interfaces exposed by
Microsoft Hyperivsor. We will use them to implement DMA remapping.

Signed-off-by: Wei Liu <wei.liu@kernel.org>
---
 include/asm-generic/hyperv-tlfs.h | 144 ++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)

diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index c1d3424f9e00..a39b0e6393f2 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -93,6 +93,13 @@
 #define HV_ENABLE_EXTENDED_HYPERCALLS		BIT(20)
 #define HV_ISOLATION				BIT(22)
 
+/*
+ * Group D features
+ */
+#define HV_DEVICE_DOMAIN_AVAILABLE		BIT(24)
+#define HV_S1_DEVICE_DOMAIN_AVAILABLE		BIT(25)
+
+
 /*
  * TSC page layout.
  */
@@ -179,6 +186,17 @@ struct ms_hyperv_tsc_page {
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0
 #define HVCALL_GET_GPA_PAGES_ACCESS_STATES 0x00c9
+#define HVCALL_CREATE_DEVICE_DOMAIN		0x00b1
+#define HVCALL_ATTACH_DEVICE_DOMAIN		0x00b2
+#define HVCALL_MAP_DEVICE_GPA_PAGES		0x00b3
+#define HVCALL_UNMAP_DEVICE_GPA_PAGES		0x00b4
+#define HVCALL_DETACH_DEVICE_DOMAIN		0x00c4
+#define HVCALL_DELETE_DEVICE_DOMAIN		0x00c5
+#define HVCALL_QUERY_DEVICE_DOMAIN		0x00c6
+#define HVCALL_MAP_SPARSE_DEVICE_GPA_PAGES	0x00c7
+#define HVCALL_UNMAP_SPARSE_DEVICE_GPA_PAGES	0x00c8
+#define HVCALL_CONFIGURE_DEVICE_DOMAIN		0x00ce
+#define HVCALL_FLUSH_DEVICE_DOMAIN		0x00d0
 #define HVCALL_MAP_VP_STATE_PAGE			0x00e1
 #define HVCALL_GET_VP_STATE				0x00e3
 #define HVCALL_SET_VP_STATE				0x00e4
@@ -1069,4 +1087,130 @@ union hv_disconnect_port {
 		u32 reserved: 31;
 	};
 } __packed;
+
+/* Device domain types */
+#define HV_DEVICE_DOMAIN_TYPE_S2  0 /* Stage 2 domain */
+#define HV_DEVICE_DOMAIN_TYPE_S1  1 /* Stage 1 domain */
+#define HV_DEVICE_DOMAIN_TYPE_SOC 2 /* SOC domain */
+
+/* ID for stage 2 default domain and NULL domain */
+#define HV_DEVICE_DOMAIN_ID_S2_DEFAULT 0
+#define HV_DEVICE_DOMAIN_ID_S2_NULL    0xFFFFFFFFULL
+
+union hv_device_domain_id {
+	u64 as_uint64;
+	struct {
+		u32 type: 4;
+		u32 reserved: 28;
+		u32 id;
+	};
+} __packed;
+
+union hv_input_vtl {
+	u8 as_uint8;
+	struct {
+		u8 target_vtl: 4;
+		u8 use_target_vtl: 1;
+		u8 reserved_z: 3;
+	};
+} __packed;
+
+struct hv_input_device_domain {
+	u64 partition_id;
+	union hv_input_vtl owner_vtl;
+	u8 padding[7];
+	union hv_device_domain_id domain_id;
+} __packed;
+
+union hv_create_device_domain_flags {
+	u32 as_uint32;
+	struct {
+		u32 forward_progress_required: 1;
+		u32 inherit_owning_vtl: 1;
+		u32 reserved: 30;
+	};
+} __packed;
+
+struct hv_input_create_device_domain {
+	struct hv_input_device_domain device_domain;
+	union hv_create_device_domain_flags create_device_domain_flags;
+} __packed;
+
+struct hv_input_delete_device_domain {
+	struct hv_input_device_domain device_domain;
+} __packed;
+
+struct hv_input_attach_device_domain {
+	struct hv_input_device_domain device_domain;
+	union hv_device_id device_id;
+} __packed;
+
+struct hv_input_detach_device_domain {
+	u64 partition_id;
+	union hv_device_id device_id;
+} __packed;
+
+struct hv_input_map_device_gpa_pages {
+	struct hv_input_device_domain device_domain;
+	union hv_input_vtl target_vtl;
+	u8 padding[3];
+	u32 map_flags;
+	u64 target_device_va_base;
+	u64 gpa_page_list[];
+} __packed;
+
+struct hv_input_unmap_device_gpa_pages {
+	struct hv_input_device_domain device_domain;
+	u64 target_device_va_base;
+} __packed;
+
+struct hv_input_query_device_domain {
+	struct hv_input_device_domain device_domain;
+	u64 target_device_va_list[];
+} __packed;
+
+struct hv_device_va_mapping {
+	u64 target_device_va;
+	u64 gpa_page_number;
+} __packed;
+
+struct hv_input_map_sparse_device_gpa_pages {
+	struct hv_input_device_domain device_domain;
+	union hv_input_vtl target_vtl;
+	u32 map_flags;
+	struct hv_device_va_mapping page_list[];
+} __packed;
+
+struct hv_input_unmap_sparse_device_gpa_pages {
+	struct hv_input_device_domain device_domain;
+	u64 target_device_va_list[];
+} __packed;
+
+struct hv_device_domain_settings_x64 {
+	struct {
+		/*
+		 * Enable translations. If not enabled, all transaction bypass
+		 * S1 translations.
+		 */
+		u64 translation_enabled: 1;
+		u64 reserved: 63;
+	} flags;
+	/* Page attribute table */
+	u64 pat;
+	/* Address of translation table */
+	u64 page_table_root;
+} __packed;
+
+struct hv_device_domain_settings {
+	union {
+		struct hv_device_domain_settings_x64 x64;
+		/* ARM TBD */
+	};
+} __packed;
+
+struct hv_input_configure_device_domain {
+	struct hv_input_device_domain device_domain;
+	struct hv_device_domain_settings settings;
+} __packed;
+
 #endif
-- 
2.30.2