| Message ID | 20240417093848.1555462-6-beata.michalska@arm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add support for AArch64 AMUv1-based arch_freq_get_on_cpu | expand |
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index f6f8d7f450e7..89118406ec68 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -793,8 +793,10 @@ store_one(scaling_max_freq, max); static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, char *buf) { - unsigned int cur_freq = __cpufreq_get(policy); + unsigned int cur_freq = arch_freq_get_on_cpu(policy->cpu); + if (!cur_freq) + cur_freq = __cpufreq_get(policy); if (cur_freq) return sprintf(buf, "%u\n", cur_freq);
Some architectures provide a way to determine an average frequency over a certain period of time based on available performance monitors (AMU on ARM or APERF/MPERf on x86). With those at hand, enroll arch_freq_get_on_cpu into cpuinfo_cur_freq policy sysfs attribute handler, which is expected to represent the current frequency of a given CPU,as obtained by the hardware. This is the type of feedback that counters do provide. Signed-off-by: Beata Michalska <beata.michalska@arm.com> --- drivers/cpufreq/cpufreq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)