Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH 3/3] cpufreq: intel_pstate: Always keep all limits settings in sync | Date | Fri, 30 Dec 2016 15:58:21 +0100 |
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Make intel_pstate update per-logical-CPU limits when the global settings are changed to ensure that they are always in sync and users will not see confusing values in per-logical-CPU sysfs attributes.
This also fixes the problem that setting the "no_turbo" global attribute to 1 in the "passive" mode (ie. when intel_pstate acts as a regular cpufreq driver) when scaling_governor is set to "performance" has no effect.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> --- drivers/cpufreq/intel_pstate.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-)
Index: linux-pm/drivers/cpufreq/intel_pstate.c =================================================================== --- linux-pm.orig/drivers/cpufreq/intel_pstate.c +++ linux-pm/drivers/cpufreq/intel_pstate.c @@ -857,13 +857,13 @@ static struct freq_attr *hwp_cpufreq_att NULL, }; -static void intel_pstate_hwp_set(const struct cpumask *cpumask) +static void intel_pstate_hwp_set(struct cpufreq_policy *policy) { int min, hw_min, max, hw_max, cpu, range, adj_range; struct perf_limits *perf_limits = limits; u64 value, cap; - for_each_cpu(cpu, cpumask) { + for_each_cpu(cpu, policy->cpus) { int max_perf_pct, min_perf_pct; struct cpudata *cpu_data = all_cpu_data[cpu]; s16 epp; @@ -949,7 +949,7 @@ skip_epp: static int intel_pstate_hwp_set_policy(struct cpufreq_policy *policy) { if (hwp_active) - intel_pstate_hwp_set(policy->cpus); + intel_pstate_hwp_set(policy); return 0; } @@ -984,11 +984,12 @@ static int intel_pstate_resume(struct cp return ret; } -static void intel_pstate_hwp_set_online_cpus(void) +static void intel_pstate_update_policies(void) { - get_online_cpus(); - intel_pstate_hwp_set(cpu_online_mask); - put_online_cpus(); + int cpu; + + for_each_possible_cpu(cpu) + cpufreq_update_policy(cpu); } /************************** debugfs begin ************************/ @@ -1109,11 +1110,10 @@ static ssize_t store_no_turbo(struct kob limits->no_turbo = clamp_t(int, input, 0, 1); - if (hwp_active) - intel_pstate_hwp_set_online_cpus(); - mutex_unlock(&intel_pstate_limits_lock); + intel_pstate_update_policies(); + return count; } @@ -1138,11 +1138,10 @@ static ssize_t store_max_perf_pct(struct limits->max_perf_pct); limits->max_perf = div_ext_fp(limits->max_perf_pct, 100); - if (hwp_active) - intel_pstate_hwp_set_online_cpus(); - mutex_unlock(&intel_pstate_limits_lock); + intel_pstate_update_policies(); + return count; } @@ -1167,11 +1166,10 @@ static ssize_t store_min_perf_pct(struct limits->min_perf_pct); limits->min_perf = div_ext_fp(limits->min_perf_pct, 100); - if (hwp_active) - intel_pstate_hwp_set_online_cpus(); - mutex_unlock(&intel_pstate_limits_lock); + intel_pstate_update_policies(); + return count; }
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