diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/cpufreq/intel_pstate.c | 236 |
1 files changed, 156 insertions, 80 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index d7a9195a8351..b6e9b49bf151 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -177,6 +177,48 @@ struct _pid { }; /** + * struct perf_limits - Store user and policy limits + * @no_turbo: User requested turbo state from intel_pstate sysfs + * @turbo_disabled: Platform turbo status either from msr + * MSR_IA32_MISC_ENABLE or when maximum available pstate + * matches the maximum turbo pstate + * @max_perf_pct: Effective maximum performance limit in percentage, this + * is minimum of either limits enforced by cpufreq policy + * or limits from user set limits via intel_pstate sysfs + * @min_perf_pct: Effective minimum performance limit in percentage, this + * is maximum of either limits enforced by cpufreq policy + * or limits from user set limits via intel_pstate sysfs + * @max_perf: This is a scaled value between 0 to 255 for max_perf_pct + * This value is used to limit max pstate + * @min_perf: This is a scaled value between 0 to 255 for min_perf_pct + * This value is used to limit min pstate + * @max_policy_pct: The maximum performance in percentage enforced by + * cpufreq setpolicy interface + * @max_sysfs_pct: The maximum performance in percentage enforced by + * intel pstate sysfs interface, unused when per cpu + * controls are enforced + * @min_policy_pct: The minimum performance in percentage enforced by + * cpufreq setpolicy interface + * @min_sysfs_pct: The minimum performance in percentage enforced by + * intel pstate sysfs interface, unused when per cpu + * controls are enforced + * + * Storage for user and policy defined limits. + */ +struct perf_limits { + int no_turbo; + int turbo_disabled; + int max_perf_pct; + int min_perf_pct; + int32_t max_perf; + int32_t min_perf; + int max_policy_pct; + int max_sysfs_pct; + int min_policy_pct; + int min_sysfs_pct; +}; + +/** * struct cpudata - Per CPU instance data storage * @cpu: CPU number for this instance data * @policy: CPUFreq policy value @@ -194,6 +236,9 @@ struct _pid { * @prev_cummulative_iowait: IO Wait time difference from last and * current sample * @sample: Storage for storing last Sample data + * @perf_limits: Pointer to perf_limit unique to this CPU + * Not all field in the structure are applicable + * 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 * @@ -217,6 +262,7 @@ struct cpudata { u64 prev_tsc; u64 prev_cummulative_iowait; struct sample sample; + struct perf_limits *perf_limits; #ifdef CONFIG_ACPI struct acpi_processor_performance acpi_perf_data; bool valid_pss_table; @@ -289,51 +335,12 @@ static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu); static struct pstate_adjust_policy pid_params __read_mostly; static struct pstate_funcs pstate_funcs __read_mostly; static int hwp_active __read_mostly; +static bool per_cpu_limits __read_mostly; #ifdef CONFIG_ACPI static bool acpi_ppc; #endif -/** - * struct perf_limits - Store user and policy limits - * @no_turbo: User requested turbo state from intel_pstate sysfs - * @turbo_disabled: Platform turbo status either from msr - * MSR_IA32_MISC_ENABLE or when maximum available pstate - * matches the maximum turbo pstate - * @max_perf_pct: Effective maximum performance limit in percentage, this - * is minimum of either limits enforced by cpufreq policy - * or limits from user set limits via intel_pstate sysfs - * @min_perf_pct: Effective minimum performance limit in percentage, this - * is maximum of either limits enforced by cpufreq policy - * or limits from user set limits via intel_pstate sysfs - * @max_perf: This is a scaled value between 0 to 255 for max_perf_pct - * This value is used to limit max pstate - * @min_perf: This is a scaled value between 0 to 255 for min_perf_pct - * This value is used to limit min pstate - * @max_policy_pct: The maximum performance in percentage enforced by - * cpufreq setpolicy interface - * @max_sysfs_pct: The maximum performance in percentage enforced by - * intel pstate sysfs interface - * @min_policy_pct: The minimum performance in percentage enforced by - * cpufreq setpolicy interface - * @min_sysfs_pct: The minimum performance in percentage enforced by - * intel pstate sysfs interface - * - * Storage for user and policy defined limits. - */ -struct perf_limits { - int no_turbo; - int turbo_disabled; - int max_perf_pct; - int min_perf_pct; - int32_t max_perf; - int32_t min_perf; - int max_policy_pct; - int max_sysfs_pct; - int min_policy_pct; - int min_sysfs_pct; -}; - static struct perf_limits performance_limits = { .no_turbo = 0, .turbo_disabled = 0, @@ -560,21 +567,30 @@ static inline void update_turbo_state(void) static void intel_pstate_hwp_set(const struct cpumask *cpumask) { int min, hw_min, max, hw_max, cpu, range, adj_range; + struct perf_limits *perf_limits = limits; u64 value, cap; for_each_cpu(cpu, cpumask) { + int max_perf_pct, min_perf_pct; + + if (per_cpu_limits) + perf_limits = all_cpu_data[cpu]->perf_limits; + rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap); hw_min = HWP_LOWEST_PERF(cap); hw_max = HWP_HIGHEST_PERF(cap); range = hw_max - hw_min; + max_perf_pct = perf_limits->max_perf_pct; + min_perf_pct = perf_limits->min_perf_pct; + rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); - adj_range = limits->min_perf_pct * range / 100; + adj_range = min_perf_pct * range / 100; min = hw_min + adj_range; value &= ~HWP_MIN_PERF(~0L); value |= HWP_MIN_PERF(min); - adj_range = limits->max_perf_pct * range / 100; + adj_range = max_perf_pct * range / 100; max = hw_min + adj_range; if (limits->no_turbo) { hw_max = HWP_GUARANTEED_PERF(cap); @@ -787,8 +803,6 @@ define_one_global_ro(num_pstates); static struct attribute *intel_pstate_attributes[] = { &no_turbo.attr, - &max_perf_pct.attr, - &min_perf_pct.attr, &turbo_pct.attr, &num_pstates.attr, NULL @@ -805,9 +819,26 @@ static void __init intel_pstate_sysfs_expose_params(void) intel_pstate_kobject = kobject_create_and_add("intel_pstate", &cpu_subsys.dev_root->kobj); - BUG_ON(!intel_pstate_kobject); + if (WARN_ON(!intel_pstate_kobject)) + return; + rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group); - BUG_ON(rc); + if (WARN_ON(rc)) + return; + + /* + * If per cpu limits are enforced there are no global limits, so + * return without creating max/min_perf_pct attributes + */ + if (per_cpu_limits) + return; + + rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr); + WARN_ON(rc); + + rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr); + WARN_ON(rc); + } /************************** sysfs end ************************/ @@ -1124,20 +1155,24 @@ static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) int max_perf = cpu->pstate.turbo_pstate; int max_perf_adj; int min_perf; + struct perf_limits *perf_limits = limits; if (limits->no_turbo || limits->turbo_disabled) max_perf = cpu->pstate.max_pstate; + if (per_cpu_limits) + perf_limits = cpu->perf_limits; + /* * performance can be limited by user through sysfs, by cpufreq * policy, or by cpu specific default values determined through * experimentation. */ - max_perf_adj = fp_toint(max_perf * limits->max_perf); + max_perf_adj = fp_toint(max_perf * perf_limits->max_perf); *max = clamp_t(int, max_perf_adj, cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); - min_perf = fp_toint(max_perf * limits->min_perf); + min_perf = fp_toint(max_perf * perf_limits->min_perf); *min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf); } @@ -1421,11 +1456,23 @@ static int intel_pstate_init_cpu(unsigned int cpunum) { struct cpudata *cpu; - if (!all_cpu_data[cpunum]) - all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), - GFP_KERNEL); - if (!all_cpu_data[cpunum]) - return -ENOMEM; + cpu = all_cpu_data[cpunum]; + + if (!cpu) { + unsigned int size = sizeof(struct cpudata); + + if (per_cpu_limits) + size += sizeof(struct perf_limits); + + cpu = kzalloc(size, GFP_KERNEL); + if (!cpu) + return -ENOMEM; + + all_cpu_data[cpunum] = cpu; + if (per_cpu_limits) + cpu->perf_limits = (struct perf_limits *)(cpu + 1); + + } cpu = all_cpu_data[cpunum]; @@ -1493,9 +1540,40 @@ static void intel_pstate_set_performance_limits(struct perf_limits *limits) limits->min_sysfs_pct = 0; } +static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy, + struct perf_limits *limits) +{ + 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->max_policy_pct = DIV_ROUND_UP(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(limits->min_perf_pct, 100); + limits->max_perf = div_fp(limits->max_perf_pct, 100); + limits->max_perf = round_up(limits->max_perf, FRAC_BITS); + + pr_debug("cpu:%d max_perf_pct:%d min_perf_pct:%d\n", policy->cpu, + limits->max_perf_pct, limits->min_perf_pct); +} + static int intel_pstate_set_policy(struct cpufreq_policy *policy) { struct cpudata *cpu; + struct perf_limits *perf_limits = NULL; if (!policy->cpuinfo.max_freq) return -ENODEV; @@ -1513,41 +1591,29 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy) policy->max = policy->cpuinfo.max_freq; } - if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) { - limits = &performance_limits; + if (per_cpu_limits) + perf_limits = cpu->perf_limits; + + if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) { + if (!perf_limits) { + limits = &performance_limits; + perf_limits = limits; + } if (policy->max >= policy->cpuinfo.max_freq) { pr_debug("set performance\n"); - intel_pstate_set_performance_limits(limits); + intel_pstate_set_performance_limits(perf_limits); goto out; } } else { pr_debug("set powersave\n"); - limits = &powersave_limits; - } - - 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->max_policy_pct = DIV_ROUND_UP(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); + if (!perf_limits) { + limits = &powersave_limits; + perf_limits = limits; + } - limits->min_perf = div_fp(limits->min_perf_pct, 100); - limits->max_perf = div_fp(limits->max_perf_pct, 100); - limits->max_perf = round_up(limits->max_perf, FRAC_BITS); + } + intel_pstate_update_perf_limits(policy, perf_limits); out: if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) { /* @@ -1607,6 +1673,14 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy) else policy->policy = CPUFREQ_POLICY_POWERSAVE; + /* + * We need sane value in the cpu->perf_limits, so inherit from global + * perf_limits limits, which are seeded with values based on the + * CONFIG_CPU_FREQ_DEFAULT_GOV_*, during boot up. + */ + if (per_cpu_limits) + memcpy(cpu->perf_limits, limits, sizeof(struct perf_limits)); + policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling; policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling; @@ -1888,6 +1962,8 @@ static int __init intel_pstate_setup(char *str) force_load = 1; if (!strcmp(str, "hwp_only")) hwp_only = 1; + if (!strcmp(str, "per_cpu_perf_limits")) + per_cpu_limits = true; #ifdef CONFIG_ACPI if (!strcmp(str, "support_acpi_ppc")) |