[PATCH v6 52/90] x86/cpu/intel: Use parsed CPUID(0xa)

[Ahmed S. Darwish]

For Intel's PMU enumeration, use parsed CPUID(0xa) instead of a CPUID query
and ugly bitwise operations.

Remove comments; the generated bitfield names already make everything clear.

Signed-off-by: Ahmed S. Darwish <darwi@xxxxxxxxxxxxx>
---
 arch/x86/kernel/cpu/intel.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 615e3a4872b7..7f186c68d701 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -547,18 +547,16 @@ static const struct x86_cpu_id zmm_exclusion_list[] = {
 
 static void init_intel(struct cpuinfo_x86 *c)
 {
+	const struct leaf_0xa_0 *la = cpuid_leaf(c, 0xa);
+
 	early_init_intel(c);
 
 	intel_workarounds(c);
 
 	init_intel_cacheinfo(c);
 
-	if (c->cpuid_level > 9) {
-		unsigned eax = cpuid_eax(10);
-		/* Check for version and the number of counters */
-		if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
-			set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
-	}
+	if (la && la->pmu_version && la->num_counters_gp > 1)
+		set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
 
 	if (cpu_has(c, X86_FEATURE_XMM2))
 		set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
-- 
2.53.0