linux-kernel - [PATCH 3/5] intel_pstate: remove intel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <2e0f8c13884240d7189087d19bb8274573638aaf.1496889051.git.len.brown@intel.com>
Date:   Wed,  7 Jun 2017 19:39:14 -0700
From:   Len Brown <lenb@...nel.org>
To:     x86@...nel.org, srinivas.pandruvada@...ux.intel.com,
        hpa@...ux.intel.com, peterz@...radead.org, rafael@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Len Brown <len.brown@...el.com>
Subject: [PATCH 3/5] intel_pstate: remove intel_pstate.get()

From: Len Brown <len.brown@...el.com>

The x86 cpufreq core now uses aperfmperf_khz_on_cpu()
to supply /sys/.../cpufreq/scaling_cur_freq
on all x86 systems supporting APERF/MPERF.

That includes 100% of systems supported by intel_pstate,
and so intel_pstate.get() is now a NOP -- remove it.

Invoke aperfmperf_khz_on_cpu() directly,
if legacy-mode p-state tracing is enabled.

Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/cpufreq/intel_pstate.c | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index b7de5bd..5d67780 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1597,12 +1597,6 @@ static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time)
 	return false;
 }
 
-static inline int32_t get_avg_frequency(struct cpudata *cpu)
-{
-	return mul_ext_fp(cpu->sample.core_avg_perf,
-			  cpu->pstate.max_pstate_physical * cpu->pstate.scaling);
-}
-
 static inline int32_t get_avg_pstate(struct cpudata *cpu)
 {
 	return mul_ext_fp(cpu->pstate.max_pstate_physical,
@@ -1728,7 +1722,7 @@ static void intel_pstate_adjust_pstate(struct cpudata *cpu, int target_pstate)
 		sample->mperf,
 		sample->aperf,
 		sample->tsc,
-		get_avg_frequency(cpu),
+		aperfmperf_khz_on_cpu(cpu->cpu),
 		fp_toint(cpu->iowait_boost * 100));
 }
 
@@ -1922,13 +1916,6 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
 	return 0;
 }
 
-static unsigned int intel_pstate_get(unsigned int cpu_num)
-{
-	struct cpudata *cpu = all_cpu_data[cpu_num];
-
-	return cpu ? get_avg_frequency(cpu) : 0;
-}
-
 static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
 {
 	struct cpudata *cpu = all_cpu_data[cpu_num];
@@ -2157,7 +2144,6 @@ static struct cpufreq_driver intel_pstate = {
 	.setpolicy	= intel_pstate_set_policy,
 	.suspend	= intel_pstate_hwp_save_state,
 	.resume		= intel_pstate_resume,
-	.get		= intel_pstate_get,
 	.init		= intel_pstate_cpu_init,
 	.exit		= intel_pstate_cpu_exit,
 	.stop_cpu	= intel_pstate_stop_cpu,
-- 
2.7.4