From d8f469e9cff3bc4a6317d923e9506be046aa7bdc Mon Sep 17 00:00:00 2001 From: Dirk Brandewie Date: Tue, 7 May 2013 08:20:26 -0700 Subject: [PATCH] cpufreq / intel_pstate: use lowest requested max performance There are two ways that the maximum p-state can be clamped, via a policy change and via the sysfs file. The acpi-thermal driver adjusts the p-state policy in response to thermal events. These changes override the users settings at the moment. Use the lowest of the two requested values this ensures that we will not exceed the requested pstate from either mechanism. Reported-by: Srinivas Pandruvada Cc: 3.9+ Signed-off-by: Dirk Brandewie Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/intel_pstate.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index c6e10d02b795..4a437ffc5186 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -117,6 +117,8 @@ struct perf_limits { int min_perf_pct; int32_t max_perf; int32_t min_perf; + int max_policy_pct; + int max_sysfs_pct; }; static struct perf_limits limits = { @@ -125,6 +127,8 @@ static struct perf_limits limits = { .max_perf = int_tofp(1), .min_perf_pct = 0, .min_perf = 0, + .max_policy_pct = 100, + .max_sysfs_pct = 100, }; static inline void pid_reset(struct _pid *pid, int setpoint, int busy, @@ -295,7 +299,8 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, if (ret != 1) return -EINVAL; - limits.max_perf_pct = clamp_t(int, input, 0 , 100); + limits.max_sysfs_pct = clamp_t(int, input, 0 , 100); + limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); return count; } @@ -646,8 +651,9 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy) limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100); limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); - limits.max_perf_pct = policy->max * 100 / policy->cpuinfo.max_freq; - limits.max_perf_pct = clamp_t(int, limits.max_perf_pct, 0 , 100); + limits.max_policy_pct = policy->max * 100 / policy->cpuinfo.max_freq; + limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100); + limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); return 0; -- 2.34.1