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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>
This commit is contained in:
Kristen Carlson Accardi 2015-01-28 15:03:27 -08:00 committed by Rafael J. Wysocki
parent 7ab0256e57
commit d01b1f48c5
2 changed files with 22 additions and 0 deletions
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4
Documentation/cpu-freq/intel-pstate.txt
View File

@ -37,6 +37,10 @@ controlling P state selection. These files have been added to
no_turbo: limits the driver to selecting P states below the turbo
frequency range.
turbo_pct: displays the percentage of the total performance that
is supported by hardware that is in the turbo range. This number
is independent of whether turbo has been disabled or not.
For contemporary Intel processors, the frequency is controlled by the
processor itself and the P-states exposed to software are related to
performance levels. The idea that frequency can be set to a single

18
drivers/cpufreq/intel_pstate.c
View File

@ -338,6 +338,22 @@ static void __init intel_pstate_debug_expose_params(void)
return sprintf(buf, "%u\n", limits.object); \
}
static ssize_t show_turbo_pct(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct cpudata *cpu;
int total, no_turbo, turbo_pct;
uint32_t turbo_fp;
cpu = all_cpu_data[0];
total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
turbo_fp = div_fp(int_tofp(no_turbo), int_tofp(total));
turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
return sprintf(buf, "%u\n", turbo_pct);
}
static ssize_t show_no_turbo(struct kobject *kobj,
struct attribute *attr, char *buf)
{
@ -418,11 +434,13 @@ show_one(min_perf_pct, min_perf_pct);
define_one_global_rw(no_turbo);
define_one_global_rw(max_perf_pct);
define_one_global_rw(min_perf_pct);
define_one_global_ro(turbo_pct);
static struct attribute *intel_pstate_attributes[] = {
&no_turbo.attr,
&max_perf_pct.attr,
&min_perf_pct.attr,
&turbo_pct.attr,
NULL
};