In current code, if system is using performance policy, user can
modify the max_perf_pct to any values lower than 100:
$ grep . /sys/devices/system/cpu/intel_pstate/m*_perf_pct
/sys/devices/system/cpu/intel_pstate/max_perf_pct:100
/sys/devices/system/cpu/intel_pstate/min_perf_pct:100
$ echo 80 > /sys/devices/system/cpu/intel_pstate/max_perf_pct
$ grep . /sys/devices/system/cpu/intel_pstate/m*_perf_pct
/sys/devices/system/cpu/intel_pstate/max_perf_pct:80
/sys/devices/system/cpu/intel_pstate/min_perf_pct:100
the max_perf_pct above is lower than min_perf_pct, which
is not reasonable.
This patch solves this problem by clamping min_perf_pct and max_perf_pct
to be strictly inside [min_policy_pct,max_policy_pct].
Signed-off-by: Chen Yu <yu.c.c...@intel.com>
---
drivers/cpufreq/intel_pstate.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index fcb929e..3702c5a 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -423,6 +423,7 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct
attribute *b,
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_pct = max(limits.min_policy_pct, limits.max_perf_pct);
limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
if (hwp_active)
@@ -442,6 +443,7 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct
attribute *b,
limits.min_sysfs_pct = clamp_t(int, input, 0 , 100);
limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct);
+ limits.min_perf_pct = min(limits.max_policy_pct, limits.min_perf_pct);
limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
if (hwp_active)
@@ -985,12 +987,14 @@ static int intel_pstate_set_policy(struct cpufreq_policy
*policy)
limits.min_policy_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
limits.min_policy_pct = clamp_t(int, limits.min_policy_pct, 0 , 100);
- limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct);
- limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(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.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct);
+ limits.min_perf_pct = min(limits.max_policy_pct, limits.min_perf_pct);
+ limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
+ limits.max_perf_pct = max(limits.min_policy_pct, limits.max_perf_pct);
limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
if (hwp_active)
--
1.8.3.1
--
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