diff options
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 242 |
1 files changed, 224 insertions, 18 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index c7f596f7b8cc..7cd0177ddeaf 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -249,9 +249,14 @@ 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_powersave: Last saved HWP energy performance preference + * (EPP) or energy performance bias (EPB), + * when policy switched to performance * @epp_policy: Last saved policy used to set EPP/EPB + * @epp_default: Power on default HWP energy performance + * preference/bias + * @epp_saved: Saved EPP/EPB during system suspend or CPU offline + * operation * * This structure stores per CPU instance data for all CPUs. */ @@ -279,8 +284,10 @@ struct cpudata { bool valid_pss_table; #endif unsigned int iowait_boost; - s16 epp_saved; + s16 epp_powersave; s16 epp_policy; + s16 epp_default; + s16 epp_saved; }; static struct cpudata **all_cpu_data; @@ -598,29 +605,204 @@ static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data) { s16 epp; - if (static_cpu_has(X86_FEATURE_HWP_EPP)) + if (static_cpu_has(X86_FEATURE_HWP_EPP)) { + /* + * When hwp_req_data is 0, means that caller didn't read + * MSR_HWP_REQUEST, so need to read and get EPP. + */ + if (!hwp_req_data) { + epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, + &hwp_req_data); + if (epp) + return epp; + } epp = (hwp_req_data >> 24) & 0xff; - else + } 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) +static int intel_pstate_set_epb(int cpu, s16 pref) { u64 epb; + int ret; if (!static_cpu_has(X86_FEATURE_EPB)) - return; + return -ENXIO; - if (rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb)) - return; + ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb); + if (ret) + return ret; epb = (epb & ~0x0f) | pref; wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb); + + return 0; } +/* + * EPP/EPB display strings corresponding to EPP index in the + * energy_perf_strings[] + * index String + *------------------------------------- + * 0 default + * 1 performance + * 2 balance_performance + * 3 balance_power + * 4 power + */ +static const char * const energy_perf_strings[] = { + "default", + "performance", + "balance_performance", + "balance_power", + "power", + NULL +}; + +static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data) +{ + s16 epp; + int index = -EINVAL; + + epp = intel_pstate_get_epp(cpu_data, 0); + if (epp < 0) + return epp; + + if (static_cpu_has(X86_FEATURE_HWP_EPP)) { + /* + * Range: + * 0x00-0x3F : Performance + * 0x40-0x7F : Balance performance + * 0x80-0xBF : Balance power + * 0xC0-0xFF : Power + * The EPP is a 8 bit value, but our ranges restrict the + * value which can be set. Here only using top two bits + * effectively. + */ + index = (epp >> 6) + 1; + } else if (static_cpu_has(X86_FEATURE_EPB)) { + /* + * Range: + * 0x00-0x03 : Performance + * 0x04-0x07 : Balance performance + * 0x08-0x0B : Balance power + * 0x0C-0x0F : Power + * The EPB is a 4 bit value, but our ranges restrict the + * value which can be set. Here only using top two bits + * effectively. + */ + index = (epp >> 2) + 1; + } + + return index; +} + +static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data, + int pref_index) +{ + int epp = -EINVAL; + int ret; + + if (!pref_index) + epp = cpu_data->epp_default; + + mutex_lock(&intel_pstate_limits_lock); + + if (static_cpu_has(X86_FEATURE_HWP_EPP)) { + u64 value; + + ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, &value); + if (ret) + goto return_pref; + + value &= ~GENMASK_ULL(31, 24); + + /* + * If epp is not default, convert from index into + * energy_perf_strings to epp value, by shifting 6 + * bits left to use only top two bits in epp. + * The resultant epp need to shifted by 24 bits to + * epp position in MSR_HWP_REQUEST. + */ + if (epp == -EINVAL) + epp = (pref_index - 1) << 6; + + value |= (u64)epp << 24; + ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value); + } else { + if (epp == -EINVAL) + epp = (pref_index - 1) << 2; + ret = intel_pstate_set_epb(cpu_data->cpu, epp); + } +return_pref: + mutex_unlock(&intel_pstate_limits_lock); + + return ret; +} + +static ssize_t show_energy_performance_available_preferences( + struct cpufreq_policy *policy, char *buf) +{ + int i = 0; + int ret = 0; + + while (energy_perf_strings[i] != NULL) + ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]); + + ret += sprintf(&buf[ret], "\n"); + + return ret; +} + +cpufreq_freq_attr_ro(energy_performance_available_preferences); + +static ssize_t store_energy_performance_preference( + struct cpufreq_policy *policy, const char *buf, size_t count) +{ + struct cpudata *cpu_data = all_cpu_data[policy->cpu]; + char str_preference[21]; + int ret, i = 0; + + ret = sscanf(buf, "%20s", str_preference); + if (ret != 1) + return -EINVAL; + + while (energy_perf_strings[i] != NULL) { + if (!strcmp(str_preference, energy_perf_strings[i])) { + intel_pstate_set_energy_pref_index(cpu_data, i); + return count; + } + ++i; + } + + return -EINVAL; +} + +static ssize_t show_energy_performance_preference( + struct cpufreq_policy *policy, char *buf) +{ + struct cpudata *cpu_data = all_cpu_data[policy->cpu]; + int preference; + + preference = intel_pstate_get_energy_pref_index(cpu_data); + if (preference < 0) + return preference; + + return sprintf(buf, "%s\n", energy_perf_strings[preference]); +} + +cpufreq_freq_attr_rw(energy_performance_preference); + +static struct freq_attr *hwp_cpufreq_attrs[] = { + &energy_performance_preference, + &energy_performance_available_preferences, + NULL, +}; + static void intel_pstate_hwp_set(const struct cpumask *cpumask) { int min, hw_min, max, hw_max, cpu, range, adj_range; @@ -665,20 +847,24 @@ static void intel_pstate_hwp_set(const struct cpumask *cpumask) cpu_data->epp_policy = cpu_data->policy; + if (cpu_data->epp_saved >= 0) { + epp = cpu_data->epp_saved; + cpu_data->epp_saved = -EINVAL; + goto update_epp; + } + if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) { epp = intel_pstate_get_epp(cpu_data, value); + cpu_data->epp_powersave = epp; /* If EPP read was failed, then don't try to write */ - if (epp < 0) { - cpu_data->epp_saved = epp; + if (epp < 0) 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) + if (cpu_data->epp_powersave < 0) goto skip_epp; /* @@ -692,8 +878,9 @@ static void intel_pstate_hwp_set(const struct cpumask *cpumask) if (epp) goto skip_epp; - epp = cpu_data->epp_saved; + epp = cpu_data->epp_powersave; } +update_epp: if (static_cpu_has(X86_FEATURE_HWP_EPP)) { value &= ~GENMASK_ULL(31, 24); value |= (u64)epp << 24; @@ -713,13 +900,24 @@ static int intel_pstate_hwp_set_policy(struct cpufreq_policy *policy) return 0; } +static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy) +{ + struct cpudata *cpu_data = all_cpu_data[policy->cpu]; + + if (!hwp_active) + return 0; + + cpu_data->epp_saved = intel_pstate_get_epp(cpu_data, 0); + + 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); } @@ -977,7 +1175,8 @@ static void intel_pstate_hwp_enable(struct cpudata *cpudata) wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); cpudata->epp_policy = 0; - cpudata->epp_saved = -EINVAL; + if (cpudata->epp_default == -EINVAL) + cpudata->epp_default = intel_pstate_get_epp(cpudata, 0); } static int atom_get_min_pstate(void) @@ -1610,6 +1809,9 @@ static int intel_pstate_init_cpu(unsigned int cpunum) if (per_cpu_limits) cpu->perf_limits = (struct perf_limits *)(cpu + 1); + cpu->epp_default = -EINVAL; + cpu->epp_powersave = -EINVAL; + cpu->epp_saved = -EINVAL; } cpu = all_cpu_data[cpunum]; @@ -1802,7 +2004,9 @@ static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) pr_debug("CPU %d exiting\n", policy->cpu); intel_pstate_clear_update_util_hook(policy->cpu); - if (!hwp_active) + if (hwp_active) + intel_pstate_hwp_save_state(policy); + else intel_cpufreq_stop_cpu(policy); } @@ -1872,6 +2076,7 @@ static struct cpufreq_driver intel_pstate = { .flags = CPUFREQ_CONST_LOOPS, .verify = intel_pstate_verify_policy, .setpolicy = intel_pstate_set_policy, + .suspend = intel_pstate_hwp_save_state, .resume = intel_pstate_resume, .get = intel_pstate_get, .init = intel_pstate_cpu_init, @@ -2189,6 +2394,7 @@ static int __init intel_pstate_init(void) if (x86_match_cpu(hwp_support_ids) && !no_hwp) { copy_cpu_funcs(&core_params.funcs); hwp_active++; + intel_pstate.attr = hwp_cpufreq_attrs; goto hwp_cpu_matched; } |
