diff options
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 35 |
1 files changed, 15 insertions, 20 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 8f1f01ca9b8e..c55f6e35a1e3 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -649,28 +649,18 @@ static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data, if (!pref_index) epp = cpu_data->epp_default; - mutex_lock(&intel_pstate_limits_lock); - if (boot_cpu_has(X86_FEATURE_HWP_EPP)) { u64 value; ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, &value); if (ret) - goto return_pref; + return ret; value &= ~GENMASK_ULL(31, 24); - if (use_raw) { - if (raw_epp > 255) { - ret = -EINVAL; - goto return_pref; - } - value |= (u64)raw_epp << 24; - ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value); - goto return_pref; - } - - if (epp == -EINVAL) + if (use_raw) + epp = raw_epp; + else if (epp == -EINVAL) epp = epp_values[pref_index - 1]; value |= (u64)epp << 24; @@ -680,8 +670,6 @@ static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data, epp = (pref_index - 1) << 2; ret = intel_pstate_set_epb(cpu_data->cpu, epp); } -return_pref: - mutex_unlock(&intel_pstate_limits_lock); return ret; } @@ -708,8 +696,8 @@ static ssize_t store_energy_performance_preference( struct cpudata *cpu_data = all_cpu_data[policy->cpu]; char str_preference[21]; bool raw = false; + ssize_t ret; u32 epp = 0; - int ret; ret = sscanf(buf, "%20s", str_preference); if (ret != 1) @@ -724,14 +712,21 @@ static ssize_t store_energy_performance_preference( if (ret) return ret; + if (epp > 255) + return -EINVAL; + raw = true; } + mutex_lock(&intel_pstate_limits_lock); + ret = intel_pstate_set_energy_pref_index(cpu_data, ret, raw, epp); - if (ret) - return ret; + if (!ret) + ret = count; - return count; + mutex_unlock(&intel_pstate_limits_lock); + + return ret; } static ssize_t show_energy_performance_preference( |