From: Ionela Voinescu <ionela.voinescu@arm.com>
To: rjw@rjwysocki.net, viresh.kumar@linaro.org, lenb@kernel.org
Cc: yousaf.kaukab@suse.com, jeremy.linton@arm.com,
lukasz.luba@arm.com, valentin.schneider@arm.com,
linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org, ionela.voinescu@arm.com
Subject: [PATCH v2 3/4] cppc_cpufreq: expose information on frequency domains
Date: Mon, 14 Dec 2020 12:38:22 +0000 [thread overview]
Message-ID: <20201214123823.3949-4-ionela.voinescu@arm.com> (raw)
In-Reply-To: <20201214123823.3949-1-ionela.voinescu@arm.com>
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>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
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 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",
};
--
2.29.2.dirty
next prev parent reply other threads:[~2020-12-14 12:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 12:38 [PATCH v2 0/4] cppc_cpufreq: fix, clarify and improve support Ionela Voinescu
2020-12-14 12:38 ` [PATCH v2 1/4] cppc_cpufreq: use policy->cpu as driver of frequency setting Ionela Voinescu
2020-12-14 12:38 ` [PATCH v2 2/4] cppc_cpufreq: clarify support for coordination types Ionela Voinescu
2020-12-14 12:38 ` Ionela Voinescu [this message]
2020-12-14 12:38 ` [PATCH v2 4/4] cppc_cpufreq: replace per-cpu data array with a list Ionela Voinescu
2020-12-14 16:11 ` [PATCH v2 0/4] cppc_cpufreq: fix, clarify and improve support Mian Yousaf Kaukab
2020-12-15 18:21 ` Rafael J. Wysocki
2020-12-15 23:31 ` Ionela Voinescu
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