From cfdc589f4b5f94bf1a975b4a67d8163d533f6e9b Mon Sep 17 00:00:00 2001 From: Ionela Voinescu Date: Mon, 14 Dec 2020 12:38:22 +0000 Subject: [PATCH] cppc_cpufreq: expose information on frequency domains Use the existing sysfs attribute "freqdomain_cpus" to expose information to userspace about CPUs in the same frequency domain. Signed-off-by: Ionela Voinescu Acked-by: Viresh Kumar Tested-by: Mian Yousaf Kaukab Signed-off-by: Rafael J. Wysocki --- Documentation/ABI/testing/sysfs-devices-system-cpu | 3 ++- drivers/cpufreq/cppc_cpufreq.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 1a04ca8162ad..0eee30b27ab6 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -264,7 +264,8 @@ Description: Discover CPUs in the same CPU frequency coordination domain attribute is useful for user space DVFS controllers to get better power/performance results for platforms using acpi-cpufreq. - This file is only present if the acpi-cpufreq driver is in use. + This file is only present if the acpi-cpufreq or the cppc-cpufreq + drivers are in use. What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1} diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index f15a44c8b6b7..40b58d2dbbc6 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -402,6 +402,19 @@ static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state) return 0; } +static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf) +{ + unsigned int cpu = policy->cpu; + + return cpufreq_show_cpus(all_cpu_data[cpu]->shared_cpu_map, buf); +} +cpufreq_freq_attr_ro(freqdomain_cpus); + +static struct freq_attr *cppc_cpufreq_attr[] = { + &freqdomain_cpus, + NULL, +}; + static struct cpufreq_driver cppc_cpufreq_driver = { .flags = CPUFREQ_CONST_LOOPS, .verify = cppc_verify_policy, @@ -410,6 +423,7 @@ static struct cpufreq_driver cppc_cpufreq_driver = { .init = cppc_cpufreq_cpu_init, .stop_cpu = cppc_cpufreq_stop_cpu, .set_boost = cppc_cpufreq_set_boost, + .attr = cppc_cpufreq_attr, .name = "cppc_cpufreq", }; -- 2.20.1