| Message ID | 20201105125524.4409-8-ionela.voinescu@arm.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | cppc_cpufreq: fix, clarify and improve support | expand |
On 05-11-20, 12:55, Ionela Voinescu wrote: > Use the existing sysfs attribute "freqdomain_cpus" to expose > information to userspace about CPUs in the same frequency domain. > > Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com> > Cc: Rafael J. Wysocki <rjw@rjwysocki.net> > Cc: Viresh Kumar <viresh.kumar@linaro.org> > --- > 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 60ac7f8049b5..b4edeeb57d04 100644 > --- a/drivers/cpufreq/cppc_cpufreq.c > +++ b/drivers/cpufreq/cppc_cpufreq.c > @@ -483,6 +483,19 @@ 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) > +{ > + struct cppc_cpudata *cpu_data = policy->driver_data; > + > + return cpufreq_show_cpus(cpu_data->domain->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, > @@ -491,6 +504,7 @@ 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", > }; Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
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 60ac7f8049b5..b4edeeb57d04 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -483,6 +483,19 @@ 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) +{ + struct cppc_cpudata *cpu_data = policy->driver_data; + + return cpufreq_show_cpus(cpu_data->domain->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, @@ -491,6 +504,7 @@ 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", };
Use the existing sysfs attribute "freqdomain_cpus" to expose information to userspace about CPUs in the same frequency domain. Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Viresh Kumar <viresh.kumar@linaro.org> --- Documentation/ABI/testing/sysfs-devices-system-cpu | 3 ++- drivers/cpufreq/cppc_cpufreq.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+), 1 deletion(-)