[PATCH v7 059/120] x86/cpuid: Parse CPUID(0x5)

Parse CPUID(0x5), CPUID_LEAF_MWAIT, so that its call sites can be converted
to the CPUID API next.

Introduce cpuid_mwait_n_substates() since its logic is required by multiple
call sits.

Signed-off-by: Ahmed S. Darwish <[email protected]>
---
 arch/x86/include/asm/cpuid/api.h   | 19 +++++++++++++++++++
 arch/x86/include/asm/cpuid/types.h |  1 +
 arch/x86/kernel/cpu/cpuid_parser.h |  1 +
 3 files changed, 21 insertions(+)

diff --git a/arch/x86/include/asm/cpuid/api.h b/arch/x86/include/asm/cpuid/api.h
index 611ee8596115..540f886a61cd 100644
--- a/arch/x86/include/asm/cpuid/api.h
+++ b/arch/x86/include/asm/cpuid/api.h
@@ -493,6 +493,25 @@ static inline u32 cpuid_base_hypervisor(const char *sig, u32 leaves)
 	     _ptr < &((const union leaf_0x2_regs *)(_regs))->desc[16] && (_desc = &cpuid_0x2_table[*_ptr]);\
 	     _ptr++)
 
+/*
+ * CPUID(0x5)
+ */
+
+static inline unsigned int cpuid_mwait_n_substates(const struct leaf_0x5_0 *l5, unsigned int cstate)
+{
+	switch (cstate) {
+	case 0:		return l5->n_c0_substates;
+	case 1:		return l5->n_c1_substates;
+	case 2:		return l5->n_c2_substates;
+	case 3:		return l5->n_c3_substates;
+	case 4:		return l5->n_c4_substates;
+	case 5:		return l5->n_c5_substates;
+	case 6:		return l5->n_c6_substates;
+	case 7:		return l5->n_c7_substates;
+	default:	return 0;
+	}
+}
+
 /*
  * CPUID(0x80000006)
  */
diff --git a/arch/x86/include/asm/cpuid/types.h b/arch/x86/include/asm/cpuid/types.h
index f50e54bfb514..50156e9883a3 100644
--- a/arch/x86/include/asm/cpuid/types.h
+++ b/arch/x86/include/asm/cpuid/types.h
@@ -212,6 +212,7 @@ struct cpuid_leaves {
 	CPUID_LEAF   (	0x1,		0  );
 	CPUID_LEAF   (  0x2,		0  );
 	CPUID_LEAF_N (  0x4,		8  );
+	CPUID_LEAF   (	0x5,		0  );
 	CPUID_LEAF   (	0x16,		0  );
 	CPUID_LEAF   (  0x80000000,	0  );
 	CPUID_LEAF   (  0x80000002,	0  );
diff --git a/arch/x86/kernel/cpu/cpuid_parser.h b/arch/x86/kernel/cpu/cpuid_parser.h
index ab391de03a92..3a60dad4e861 100644
--- a/arch/x86/kernel/cpu/cpuid_parser.h
+++ b/arch/x86/kernel/cpu/cpuid_parser.h
@@ -146,6 +146,7 @@ struct cpuid_parse_entry {
 	/*			Leaf		Subleaf		Reader function */		\
 	CPUID_PARSE_ENTRY   (	0x2,		0,		0x2			),	\
 	CPUID_PARSE_ENTRY_N (	0x4,				deterministic_cache	),	\
+	CPUID_PARSE_ENTRY   (	0x5,		0,		generic			),	\
 	CPUID_PARSE_ENTRY   (	0x16,		0,		generic			),	\
 	CPUID_PARSE_ENTRY   (	0x80000000,	0,		0x80000000		),	\
 	CPUID_PARSE_ENTRY   (	0x80000002,	0,		generic			),	\
-- 
2.54.0