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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/include/uapi/linux/btf.h
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@@ -34,13 +34,16 @@
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 	 * bits  0-15: vlen (e.g. # of struct's members)
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 	 * bits 16-23: unused
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 	 * bits 24-27: kind (e.g. int, ptr, array...etc)
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-	 * bits 28-31: unused
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+	 * bits 28-30: unused
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+	 * bit     31: kind_flag, currently used by
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+	 *             struct, union and fwd
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 	 */
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 	__u32 info;
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-	/* "size" is used by INT, ENUM, STRUCT and UNION.
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+	/* "size" is used by INT, ENUM, STRUCT, UNION and DATASEC.
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 	 * "size" tells the size of the type it is describing.
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 	 *
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-	 * "type" is used by PTR, TYPEDEF, VOLATILE, CONST and RESTRICT.
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+	 * "type" is used by PTR, TYPEDEF, VOLATILE, CONST, RESTRICT,
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+	 * FUNC, FUNC_PROTO and VAR.
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 	 * "type" is a type_id referring to another type.
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 	 */
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 	union {
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@@ -51,6 +54,7 @@
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 #define BTF_INFO_KIND(info)	(((info) >> 24) & 0x0f)
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 #define BTF_INFO_VLEN(info)	((info) & 0xffff)
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+#define BTF_INFO_KFLAG(info)	((info) >> 31)
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 #define BTF_KIND_UNKN		0	/* Unknown	*/
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 #define BTF_KIND_INT		1	/* Integer	*/
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@@ -64,8 +68,12 @@
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 #define BTF_KIND_VOLATILE	9	/* Volatile	*/
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 #define BTF_KIND_CONST		10	/* Const	*/
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 #define BTF_KIND_RESTRICT	11	/* Restrict	*/
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-#define BTF_KIND_MAX		11
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-#define NR_BTF_KINDS		12
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+#define BTF_KIND_FUNC		12	/* Function	*/
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+#define BTF_KIND_FUNC_PROTO	13	/* Function Proto	*/
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+#define BTF_KIND_VAR		14	/* Variable	*/
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+#define BTF_KIND_DATASEC	15	/* Section	*/
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+#define BTF_KIND_MAX		BTF_KIND_DATASEC
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+#define NR_BTF_KINDS		(BTF_KIND_MAX + 1)
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 /* For some specific BTF_KIND, "struct btf_type" is immediately
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  * followed by extra data.
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@@ -75,7 +83,7 @@
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  * is the 32 bits arrangement:
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  */
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 #define BTF_INT_ENCODING(VAL)	(((VAL) & 0x0f000000) >> 24)
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-#define BTF_INT_OFFSET(VAL)	(((VAL  & 0x00ff0000)) >> 16)
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+#define BTF_INT_OFFSET(VAL)	(((VAL) & 0x00ff0000) >> 16)
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 #define BTF_INT_BITS(VAL)	((VAL)  & 0x000000ff)
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 /* Attributes stored in the BTF_INT_ENCODING */
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@@ -107,7 +115,58 @@
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 struct btf_member {
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 	__u32	name_off;
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 	__u32	type;
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-	__u32	offset;	/* offset in bits */
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+	/* If the type info kind_flag is set, the btf_member offset
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+	 * contains both member bitfield size and bit offset. The
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+	 * bitfield size is set for bitfield members. If the type
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+	 * info kind_flag is not set, the offset contains only bit
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+	 * offset.
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+	 */
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+	__u32	offset;
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+};
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+
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+/* If the struct/union type info kind_flag is set, the
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+ * following two macros are used to access bitfield_size
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+ * and bit_offset from btf_member.offset.
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+ */
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+#define BTF_MEMBER_BITFIELD_SIZE(val)	((val) >> 24)
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+#define BTF_MEMBER_BIT_OFFSET(val)	((val) & 0xffffff)
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+
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+/* BTF_KIND_FUNC_PROTO is followed by multiple "struct btf_param".
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+ * The exact number of btf_param is stored in the vlen (of the
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+ * info in "struct btf_type").
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+ */
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+struct btf_param {
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+	__u32	name_off;
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+	__u32	type;
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+};
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+
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+enum {
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+	BTF_VAR_STATIC = 0,
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+	BTF_VAR_GLOBAL_ALLOCATED = 1,
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+	BTF_VAR_GLOBAL_EXTERN = 2,
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+};
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+
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+enum btf_func_linkage {
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+	BTF_FUNC_STATIC = 0,
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+	BTF_FUNC_GLOBAL = 1,
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+	BTF_FUNC_EXTERN = 2,
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+};
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+
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+/* BTF_KIND_VAR is followed by a single "struct btf_var" to describe
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+ * additional information related to the variable such as its linkage.
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+ */
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+struct btf_var {
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+	__u32	linkage;
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+};
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+
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+/* BTF_KIND_DATASEC is followed by multiple "struct btf_var_secinfo"
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+ * to describe all BTF_KIND_VAR types it contains along with it's
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+ * in-section offset as well as size.
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+ */
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+struct btf_var_secinfo {
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+	__u32	type;
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+	__u32	offset;
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+	__u32	size;
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 };
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 #endif /* _UAPI__LINUX_BTF_H__ */