x86/aperfmperf: Untangle Intel and AMD frequency invariance init

AMD boot CPU initialization happens late via ACPI/CPPC which prevents the
Intel parts from being marked __init.

Split out the common code and provide a dedicated interface for the AMD
initialization and mark the Intel specific code and data __init.

The remaining text size is almost cut in half:

  text:		2614	->	1350
  init.text:	   0	->	 786

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/20220415161206.592465719@linutronix.de

1 files changed, 14 insertions, 16 deletions

diff --git a/arch/x86/kernel/acpi/cppc.c b/arch/x86/kernel/acpi/cppc.c
index 06109d927a18..8b8cbf22461a 100644
--- a/arch/x86/kernel/acpi/cppc.c
+++ b/arch/x86/kernel/acpi/cppc.c
@@ -50,20 +50,17 @@ int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
 	return err;
 }
 
-bool amd_set_max_freq_ratio(u64 *ratio)
+static void amd_set_max_freq_ratio(void)
 {
 	struct cppc_perf_caps perf_caps;
 	u64 highest_perf, nominal_perf;
 	u64 perf_ratio;
 	int rc;
 
-	if (!ratio)
-		return false;
-
 	rc = cppc_get_perf_caps(0, &perf_caps);
 	if (rc) {
 		pr_debug("Could not retrieve perf counters (%d)\n", rc);
-		return false;
+		return;
 	}
 
 	highest_perf = amd_get_highest_perf();
@@ -71,7 +68,7 @@ bool amd_set_max_freq_ratio(u64 *ratio)
 
 	if (!highest_perf || !nominal_perf) {
 		pr_debug("Could not retrieve highest or nominal performance\n");
-		return false;
+		return;
 	}
 
 	perf_ratio = div_u64(highest_perf * SCHED_CAPACITY_SCALE, nominal_perf);
@@ -79,26 +76,27 @@ bool amd_set_max_freq_ratio(u64 *ratio)
 	perf_ratio = (perf_ratio + SCHED_CAPACITY_SCALE) >> 1;
 	if (!perf_ratio) {
 		pr_debug("Non-zero highest/nominal perf values led to a 0 ratio\n");
-		return false;
+		return;
 	}
 
-	*ratio = perf_ratio;
-	arch_set_max_freq_ratio(false);
-
-	return true;
+	freq_invariance_set_perf_ratio(perf_ratio, false);
 }
 
 static DEFINE_MUTEX(freq_invariance_lock);
 
 void init_freq_invariance_cppc(void)
 {
-	static bool secondary;
+	static bool init_done;
 
-	mutex_lock(&freq_invariance_lock);
+	if (!cpu_feature_enabled(X86_FEATURE_APERFMPERF))
+		return;
 
-	if (!secondary)
-		bp_init_freq_invariance(true);
-	secondary = true;
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+		return;
 
+	mutex_lock(&freq_invariance_lock);
+	if (!init_done)
+		amd_set_max_freq_ratio();
+	init_done = true;
 	mutex_unlock(&freq_invariance_lock);
 }