x86/aperfmperf: Make parts of the frequency invariance code unconditional

The frequency invariance support is currently limited to x86/64 and SMP,
which is the vast majority of machines.

arch_scale_freq_tick() is called every tick on all CPUs and reads the APERF
and MPERF MSRs. The CPU frequency getters function do the same via dedicated
IPIs.

While it could be argued that on systems where frequency invariance support
is disabled (32bit, !SMP) the per tick read of the APERF and MPERF MSRs can
be avoided, it does not make sense to keep the extra code and the resulting
runtime issues of mass IPIs around.

As a first step split out the non frequency invariance specific
initialization code and the read MSR portion of arch_scale_freq_tick(). The
rest of the code is still conditional and guarded with a static key.

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/20220415161206.761988704@linutronix.de

1 files changed, 38 insertions, 25 deletions

diff --git a/arch/x86/kernel/cpu/aperfmperf.c b/arch/x86/kernel/cpu/aperfmperf.c
index 6220503af26a..df528a4f6de3 100644
--- a/arch/x86/kernel/cpu/aperfmperf.c
+++ b/arch/x86/kernel/cpu/aperfmperf.c
@@ -17,6 +17,7 @@
 #include <linux/smp.h>
 #include <linux/syscore_ops.h>
 
+#include <asm/cpu.h>
 #include <asm/cpu_device_id.h>
 #include <asm/intel-family.h>
 
@@ -164,6 +165,17 @@ unsigned int arch_freq_get_on_cpu(int cpu)
 	return per_cpu(samples.khz, cpu);
 }
 
+static void init_counter_refs(void)
+{
+	u64 aperf, mperf;
+
+	rdmsrl(MSR_IA32_APERF, aperf);
+	rdmsrl(MSR_IA32_MPERF, mperf);
+
+	this_cpu_write(cpu_samples.aperf, aperf);
+	this_cpu_write(cpu_samples.mperf, mperf);
+}
+
 #if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
 /*
  * APERF/MPERF frequency ratio computation.
@@ -405,17 +417,6 @@ out:
 	return true;
 }
 
-static void init_counter_refs(void)
-{
-	u64 aperf, mperf;
-
-	rdmsrl(MSR_IA32_APERF, aperf);
-	rdmsrl(MSR_IA32_MPERF, mperf);
-
-	this_cpu_write(cpu_samples.aperf, aperf);
-	this_cpu_write(cpu_samples.mperf, mperf);
-}
-
 #ifdef CONFIG_PM_SLEEP
 static struct syscore_ops freq_invariance_syscore_ops = {
 	.resume = init_counter_refs,
@@ -447,13 +448,8 @@ void freq_invariance_set_perf_ratio(u64 ratio, bool turbo_disabled)
 	freq_invariance_enable();
 }
 
-void __init bp_init_freq_invariance(void)
+static void __init bp_init_freq_invariance(void)
 {
-	if (!cpu_feature_enabled(X86_FEATURE_APERFMPERF))
-		return;
-
-	init_counter_refs();
-
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
 		return;
 
@@ -461,12 +457,6 @@ void __init bp_init_freq_invariance(void)
 		freq_invariance_enable();
 }
 
-void ap_init_freq_invariance(void)
-{
-	if (cpu_feature_enabled(X86_FEATURE_APERFMPERF))
-		init_counter_refs();
-}
-
 static void disable_freq_invariance_workfn(struct work_struct *work)
 {
 	static_branch_disable(&arch_scale_freq_key);
@@ -481,6 +471,9 @@ static void scale_freq_tick(u64 acnt, u64 mcnt)
 {
 	u64 freq_scale;
 
+	if (!arch_scale_freq_invariant())
+		return;
+
 	if (check_shl_overflow(acnt, 2*SCHED_CAPACITY_SHIFT, &acnt))
 		goto error;
 
@@ -501,13 +494,17 @@ error:
 	pr_warn("Scheduler frequency invariance went wobbly, disabling!\n");
 	schedule_work(&disable_freq_invariance_work);
 }
+#else
+static inline void bp_init_freq_invariance(void) { }
+static inline void scale_freq_tick(u64 acnt, u64 mcnt) { }
+#endif /* CONFIG_X86_64 && CONFIG_SMP */
 
 void arch_scale_freq_tick(void)
 {
 	struct aperfmperf *s = this_cpu_ptr(&cpu_samples);
 	u64 acnt, mcnt, aperf, mperf;
 
-	if (!arch_scale_freq_invariant())
+	if (!cpu_feature_enabled(X86_FEATURE_APERFMPERF))
 		return;
 
 	rdmsrl(MSR_IA32_APERF, aperf);
@@ -520,4 +517,20 @@ void arch_scale_freq_tick(void)
 
 	scale_freq_tick(acnt, mcnt);
 }
-#endif /* CONFIG_X86_64 && CONFIG_SMP */
+
+static int __init bp_init_aperfmperf(void)
+{
+	if (!cpu_feature_enabled(X86_FEATURE_APERFMPERF))
+		return 0;
+
+	init_counter_refs();
+	bp_init_freq_invariance();
+	return 0;
+}
+early_initcall(bp_init_aperfmperf);
+
+void ap_init_aperfmperf(void)
+{
+	if (cpu_feature_enabled(X86_FEATURE_APERFMPERF))
+		init_counter_refs();
+}