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intel_pstate: expose turbo range to sysfs
This patch adds "turbo_pct" to the intel_pstate sysfs interface. turbo_pct will display the percentage of the total supported pstates that are in the turbo range. This value is independent of whether turbo has been disabled or not. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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2 changed files with 22 additions and 0 deletions
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@ -37,6 +37,10 @@ controlling P state selection. These files have been added to
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no_turbo: limits the driver to selecting P states below the turbo
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no_turbo: limits the driver to selecting P states below the turbo
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frequency range.
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frequency range.
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turbo_pct: displays the percentage of the total performance that
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is supported by hardware that is in the turbo range. This number
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is independent of whether turbo has been disabled or not.
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For contemporary Intel processors, the frequency is controlled by the
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For contemporary Intel processors, the frequency is controlled by the
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processor itself and the P-states exposed to software are related to
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processor itself and the P-states exposed to software are related to
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performance levels. The idea that frequency can be set to a single
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performance levels. The idea that frequency can be set to a single
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@ -338,6 +338,22 @@ static void __init intel_pstate_debug_expose_params(void)
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return sprintf(buf, "%u\n", limits.object); \
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return sprintf(buf, "%u\n", limits.object); \
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}
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}
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static ssize_t show_turbo_pct(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct cpudata *cpu;
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int total, no_turbo, turbo_pct;
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uint32_t turbo_fp;
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cpu = all_cpu_data[0];
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total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
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no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
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turbo_fp = div_fp(int_tofp(no_turbo), int_tofp(total));
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turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
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return sprintf(buf, "%u\n", turbo_pct);
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}
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static ssize_t show_no_turbo(struct kobject *kobj,
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static ssize_t show_no_turbo(struct kobject *kobj,
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struct attribute *attr, char *buf)
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struct attribute *attr, char *buf)
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{
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{
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@ -418,11 +434,13 @@ show_one(min_perf_pct, min_perf_pct);
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define_one_global_rw(no_turbo);
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define_one_global_rw(no_turbo);
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define_one_global_rw(max_perf_pct);
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define_one_global_rw(max_perf_pct);
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define_one_global_rw(min_perf_pct);
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define_one_global_rw(min_perf_pct);
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define_one_global_ro(turbo_pct);
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static struct attribute *intel_pstate_attributes[] = {
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static struct attribute *intel_pstate_attributes[] = {
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&no_turbo.attr,
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&no_turbo.attr,
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&max_perf_pct.attr,
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&max_perf_pct.attr,
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&min_perf_pct.attr,
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&min_perf_pct.attr,
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&turbo_pct.attr,
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NULL
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NULL
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};
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};
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