linux-kernel - [PATCH v1 5/6] cpufreq: intel_pstate: Replace three global.turbo

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Date: Mon, 25 Mar 2024 18:05:06 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject:
 [PATCH v1 5/6] cpufreq: intel_pstate: Replace three global.turbo_disabled
 checks

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Replace the global.turbo_disabled in __intel_pstate_update_max_freq() with
a global.no_turbo one to make store_no_turbo() actually update the maximum
CPU frequency on the trubo preference changes, which needs to be consistent
with arch_set_max_freq_ratio() called from there.

For more consistency, replace the global.turbo_disabled checks in
__intel_pstate_cpu_init() and intel_cpufreq_adjust_perf() with
global.no_turbo checks either.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/cpufreq/intel_pstate.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Index: linux-pm/drivers/cpufreq/intel_pstate.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/intel_pstate.c
+++ linux-pm/drivers/cpufreq/intel_pstate.c
@@ -1153,7 +1153,7 @@ static void intel_pstate_update_policies
 static void __intel_pstate_update_max_freq(struct cpudata *cpudata,
 					   struct cpufreq_policy *policy)
 {
-	policy->cpuinfo.max_freq = global.turbo_disabled ?
+	policy->cpuinfo.max_freq = READ_ONCE(global.no_turbo) ?
 			cpudata->pstate.max_freq : cpudata->pstate.turbo_freq;
 	refresh_frequency_limits(policy);
 }
@@ -2704,7 +2704,7 @@ static int __intel_pstate_cpu_init(struc

 	/* cpuinfo and default policy values */
 	policy->cpuinfo.min_freq = cpu->pstate.min_freq;
-	policy->cpuinfo.max_freq = global.turbo_disabled ?
+	policy->cpuinfo.max_freq = READ_ONCE(global.no_turbo) ?
 			cpu->pstate.max_freq : cpu->pstate.turbo_freq;

 	policy->min = policy->cpuinfo.min_freq;
@@ -2907,8 +2907,9 @@ static void intel_cpufreq_adjust_perf(un
 	int old_pstate = cpu->pstate.current_pstate;
 	int cap_pstate, min_pstate, max_pstate, target_pstate;

-	cap_pstate = global.turbo_disabled ? HWP_GUARANTEED_PERF(hwp_cap) :
-					     HWP_HIGHEST_PERF(hwp_cap);
+	cap_pstate = READ_ONCE(global.no_turbo) ?
+					HWP_GUARANTEED_PERF(hwp_cap) :
+					HWP_HIGHEST_PERF(hwp_cap);

 	/* Optimization: Avoid unnecessary divisions. */