diff options
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 106 |
1 files changed, 105 insertions, 1 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 7159dbde0160..0b90a63de46d 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -249,6 +249,9 @@ struct perf_limits { * when per cpu controls are enforced * @acpi_perf_data: Stores ACPI perf information read from _PSS * @valid_pss_table: Set to true for valid ACPI _PSS entries found + * @epp_saved: Last saved HWP energy performance preference + * (EPP) or energy performance bias (EPB) + * @epp_policy: Last saved policy used to set EPP/EPB * * This structure stores per CPU instance data for all CPUs. */ @@ -276,6 +279,8 @@ struct cpudata { bool valid_pss_table; #endif unsigned int iowait_boost; + s16 epp_saved; + s16 epp_policy; }; static struct cpudata **all_cpu_data; @@ -574,6 +579,48 @@ static inline void update_turbo_state(void) cpu->pstate.max_pstate == cpu->pstate.turbo_pstate); } +static s16 intel_pstate_get_epb(struct cpudata *cpu_data) +{ + u64 epb; + int ret; + + if (!static_cpu_has(X86_FEATURE_EPB)) + return -ENXIO; + + ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb); + if (ret) + return (s16)ret; + + return (s16)(epb & 0x0f); +} + +static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data) +{ + s16 epp; + + if (static_cpu_has(X86_FEATURE_HWP_EPP)) + epp = (hwp_req_data >> 24) & 0xff; + else + /* When there is no EPP present, HWP uses EPB settings */ + epp = intel_pstate_get_epb(cpu_data); + + return epp; +} + +static void intel_pstate_set_epb(int cpu, s16 pref) +{ + u64 epb; + + if (!static_cpu_has(X86_FEATURE_EPB)) + return; + + if (rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb)) + return; + + epb = (epb & ~0x0f) | pref; + wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb); +} + static void intel_pstate_hwp_set(const struct cpumask *cpumask) { int min, hw_min, max, hw_max, cpu, range, adj_range; @@ -582,6 +629,8 @@ static void intel_pstate_hwp_set(const struct cpumask *cpumask) for_each_cpu(cpu, cpumask) { int max_perf_pct, min_perf_pct; + struct cpudata *cpu_data = all_cpu_data[cpu]; + s16 epp; if (per_cpu_limits) perf_limits = all_cpu_data[cpu]->perf_limits; @@ -610,6 +659,48 @@ static void intel_pstate_hwp_set(const struct cpumask *cpumask) value &= ~HWP_MAX_PERF(~0L); value |= HWP_MAX_PERF(max); + + if (cpu_data->epp_policy == cpu_data->policy) + goto skip_epp; + + cpu_data->epp_policy = cpu_data->policy; + + if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) { + epp = intel_pstate_get_epp(cpu_data, value); + /* If EPP read was failed, then don't try to write */ + if (epp < 0) { + cpu_data->epp_saved = epp; + goto skip_epp; + } + + cpu_data->epp_saved = epp; + + epp = 0; + } else { + /* skip setting EPP, when saved value is invalid */ + if (cpu_data->epp_saved < 0) + goto skip_epp; + + /* + * No need to restore EPP when it is not zero. This + * means: + * - Policy is not changed + * - user has manually changed + * - Error reading EPB + */ + epp = intel_pstate_get_epp(cpu_data, value); + if (epp) + goto skip_epp; + + epp = cpu_data->epp_saved; + } + if (static_cpu_has(X86_FEATURE_HWP_EPP)) { + value &= ~GENMASK_ULL(31, 24); + value |= (u64)epp << 24; + } else { + intel_pstate_set_epb(cpu, epp); + } +skip_epp: wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); } } @@ -622,6 +713,17 @@ static int intel_pstate_hwp_set_policy(struct cpufreq_policy *policy) return 0; } +static int intel_pstate_resume(struct cpufreq_policy *policy) +{ + if (!hwp_active) + return 0; + + all_cpu_data[policy->cpu]->epp_policy = 0; + all_cpu_data[policy->cpu]->epp_saved = -EINVAL; + + return intel_pstate_hwp_set_policy(policy); +} + static void intel_pstate_hwp_set_online_cpus(void) { get_online_cpus(); @@ -872,6 +974,8 @@ static void intel_pstate_hwp_enable(struct cpudata *cpudata) wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00); wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); + cpudata->epp_policy = 0; + cpudata->epp_saved = -EINVAL; } static int atom_get_min_pstate(void) @@ -1767,7 +1871,7 @@ static struct cpufreq_driver intel_pstate = { .flags = CPUFREQ_CONST_LOOPS, .verify = intel_pstate_verify_policy, .setpolicy = intel_pstate_set_policy, - .resume = intel_pstate_hwp_set_policy, + .resume = intel_pstate_resume, .get = intel_pstate_get, .init = intel_pstate_cpu_init, .exit = intel_pstate_cpu_exit, |