[PATCH] [v2] intel_pstate: Fix user input of min/max to legal policy region

[Chen Yu]

In current code, max_perf_pct might be smaller than min_perf_pct
by improper user input:

$ 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

Fix this problem by 2 steps:
1.Normalize the user input to [min_policy, max_policy].
2.Make sure max_perf_pct>=min_perf_pct, suggested by Seiichi Ikarashi.

Signed-off-by: Chen Yu <yu.c.c...@intel.com>
---
v2:
 - Add logic to ensure max_perf_pct>=min_perf_pct.
---
 drivers/cpufreq/intel_pstate.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index fcb929e..a0b935f 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -423,6 +423,8 @@ 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_pct = max(limits.min_perf_pct, limits.max_perf_pct);
        limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
 
        if (hwp_active)
@@ -442,6 +444,8 @@ 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_pct = min(limits.max_perf_pct, limits.min_perf_pct);
        limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
 
        if (hwp_active)
@@ -985,12 +989,19 @@ 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);
+
+       /* Normalize user input to [min_policy_pct, max_policy_pct] */
+       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.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);
+
+       /* Make sure min_perf_pct <= max_perf_pct */
+       limits.min_perf_pct = min(limits.max_perf_pct, limits.min_perf_pct);
+
+       limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
        limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
 
        if (hwp_active)
-- 
1.8.4.2

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