From: Quentin Perret <quentin.perret@arm.com>
To: peterz@infradead.org, rjw@rjwysocki.net,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org
Cc: gregkh@linuxfoundation.org, mingo@redhat.com,
dietmar.eggemann@arm.com, morten.rasmussen@arm.com,
chris.redpath@arm.com, patrick.bellasi@arm.com,
valentin.schneider@arm.com, vincent.guittot@linaro.org,
thara.gopinath@linaro.org, viresh.kumar@linaro.org,
tkjos@google.com, joel@joelfernandes.org, smuckle@google.com,
adharmap@codeaurora.org, skannan@codeaurora.org,
pkondeti@codeaurora.org, juri.lelli@redhat.com,
edubezval@gmail.com, srinivas.pandruvada@linux.intel.com,
currojerez@riseup.net, javi.merino@kernel.org,
quentin.perret@arm.com
Subject: [PATCH v6 04/14] PM / EM: Expose the Energy Model in sysfs
Date: Mon, 20 Aug 2018 10:44:10 +0100 [thread overview]
Message-ID: <20180820094420.26590-5-quentin.perret@arm.com> (raw)
In-Reply-To: <20180820094420.26590-1-quentin.perret@arm.com>
Expose the Energy Model (read-only) of all performance domains in sysfs
for convenience. To do so, add a kobject to the CPU subsystem under the
umbrella of which a kobject for each performance domain is attached.
The resulting hierarchy is as follows for a platform with two
performance domains for example:
/sys/devices/system/cpu/energy_model
├── pd0
│ ├── cost
│ ├── cpus
│ ├── frequency
│ └── power
└── pd4
├── cost
├── cpus
├── frequency
└── power
In this implementation, the kobject abstraction is only used as a
convenient way of exposing data to sysfs. However, it could also be
used in the future to allocate and release performance domains in a more
dynamic way using reference counting.
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
---
include/linux/energy_model.h | 1 +
kernel/power/energy_model.c | 90 ++++++++++++++++++++++++++++++++++++
2 files changed, 91 insertions(+)
diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h
index b89b5596c976..5cfdfa25bf0f 100644
--- a/include/linux/energy_model.h
+++ b/include/linux/energy_model.h
@@ -19,6 +19,7 @@ struct em_cap_state {
struct em_perf_domain {
struct em_cap_state *table; /* Capacity states, in ascending order. */
int nr_cap_states;
+ struct kobject kobj;
unsigned long cpus[0]; /* CPUs of the frequency domain. */
};
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index 2aa6f94343d0..a25d23d73d4e 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -23,6 +23,82 @@ static DEFINE_PER_CPU(struct em_perf_domain *, em_data);
*/
static DEFINE_MUTEX(em_pd_mutex);
+static struct kobject *em_kobject;
+
+/* Getters for the attributes of em_perf_domain objects */
+struct em_pd_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct em_perf_domain *pd, char *buf);
+ ssize_t (*store)(struct em_perf_domain *pd, const char *buf, size_t s);
+};
+
+#define EM_ATTR_LEN 13
+#define show_table_attr(_attr) \
+static ssize_t show_##_attr(struct em_perf_domain *pd, char *buf) \
+{ \
+ ssize_t cnt = 0; \
+ int i; \
+ for (i = 0; i < pd->nr_cap_states; i++) { \
+ if (cnt >= (ssize_t) (PAGE_SIZE / sizeof(char) \
+ - (EM_ATTR_LEN + 2))) \
+ goto out; \
+ cnt += scnprintf(&buf[cnt], EM_ATTR_LEN + 1, "%lu ", \
+ pd->table[i]._attr); \
+ } \
+out: \
+ cnt += sprintf(&buf[cnt], "\n"); \
+ return cnt; \
+}
+
+show_table_attr(power);
+show_table_attr(frequency);
+show_table_attr(cost);
+
+static ssize_t show_cpus(struct em_perf_domain *pd, char *buf)
+{
+ return sprintf(buf, "%*pbl\n", cpumask_pr_args(to_cpumask(pd->cpus)));
+}
+
+#define pd_attr(_name) em_pd_##_name##_attr
+#define define_pd_attr(_name) static struct em_pd_attr pd_attr(_name) = \
+ __ATTR(_name, 0444, show_##_name, NULL)
+
+define_pd_attr(power);
+define_pd_attr(frequency);
+define_pd_attr(cost);
+define_pd_attr(cpus);
+
+static struct attribute *em_pd_default_attrs[] = {
+ &pd_attr(power).attr,
+ &pd_attr(frequency).attr,
+ &pd_attr(cost).attr,
+ &pd_attr(cpus).attr,
+ NULL
+};
+
+#define to_pd(k) container_of(k, struct em_perf_domain, kobj)
+#define to_pd_attr(a) container_of(a, struct em_pd_attr, attr)
+
+static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
+{
+ struct em_perf_domain *pd = to_pd(kobj);
+ struct em_pd_attr *pd_attr = to_pd_attr(attr);
+ ssize_t ret;
+
+ ret = pd_attr->show(pd, buf);
+
+ return ret;
+}
+
+static const struct sysfs_ops em_pd_sysfs_ops = {
+ .show = show,
+};
+
+static struct kobj_type ktype_em_pd = {
+ .sysfs_ops = &em_pd_sysfs_ops,
+ .default_attrs = em_pd_default_attrs,
+};
+
static struct em_perf_domain *em_create_pd(cpumask_t *span, int nr_states,
struct em_data_callback *cb)
{
@@ -102,6 +178,11 @@ static struct em_perf_domain *em_create_pd(cpumask_t *span, int nr_states,
pd->nr_cap_states = nr_states;
cpumask_copy(to_cpumask(pd->cpus), span);
+ ret = kobject_init_and_add(&pd->kobj, &ktype_em_pd, em_kobject,
+ "pd%u", cpu);
+ if (ret)
+ pr_err("pd%d: failed kobject_init_and_add(): %d\n", cpu, ret);
+
return pd;
free_cs_table:
@@ -155,6 +236,15 @@ int em_register_perf_domain(cpumask_t *span, unsigned int nr_states,
*/
mutex_lock(&em_pd_mutex);
+ if (!em_kobject) {
+ em_kobject = kobject_create_and_add("energy_model",
+ &cpu_subsys.dev_root->kobj);
+ if (!em_kobject) {
+ ret = -ENODEV;
+ goto unlock;
+ }
+ }
+
for_each_cpu(cpu, span) {
/* Make sure we don't register again an existing domain. */
if (READ_ONCE(per_cpu(em_data, cpu))) {
--
2.17.1
next prev parent reply other threads:[~2018-08-20 9:44 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-20 9:44 [PATCH v6 00/14] Energy Aware Scheduling Quentin Perret
2018-08-20 9:44 ` [PATCH v6 01/14] sched: Relocate arch_scale_cpu_capacity Quentin Perret
2018-08-20 9:44 ` [PATCH v6 02/14] sched/cpufreq: Factor out utilization to frequency mapping Quentin Perret
2018-09-10 9:29 ` Rafael J. Wysocki
2018-08-20 9:44 ` [PATCH v6 03/14] PM: Introduce an Energy Model management framework Quentin Perret
2018-08-29 10:04 ` Patrick Bellasi
2018-08-29 13:28 ` Quentin Perret
2018-08-31 9:04 ` Patrick Bellasi
2018-09-11 9:34 ` Andrea Parri
2018-09-11 12:32 ` Quentin Perret
2018-09-11 13:31 ` Andrea Parri
2018-09-10 9:44 ` Rafael J. Wysocki
2018-09-10 10:38 ` Quentin Perret
2018-09-10 10:40 ` Rafael J. Wysocki
2018-08-20 9:44 ` Quentin Perret [this message]
2018-09-06 6:56 ` [PATCH v6 04/14] PM / EM: Expose the Energy Model in sysfs Dietmar Eggemann
2018-09-06 14:09 ` Quentin Perret
2018-09-07 0:14 ` Dietmar Eggemann
2018-08-20 9:44 ` [PATCH v6 05/14] sched/topology: Reference the Energy Model of CPUs when available Quentin Perret
2018-08-29 16:22 ` Patrick Bellasi
2018-08-29 16:56 ` Quentin Perret
2018-08-30 10:00 ` Patrick Bellasi
2018-08-30 10:47 ` Quentin Perret
2018-08-30 12:50 ` Patrick Bellasi
2018-08-20 9:44 ` [PATCH v6 06/14] sched/topology: Lowest CPU asymmetry sched_domain level pointer Quentin Perret
2018-08-20 9:44 ` [PATCH v6 07/14] sched/topology: Introduce sched_energy_present static key Quentin Perret
2018-08-29 16:50 ` Patrick Bellasi
2018-08-29 17:20 ` Quentin Perret
2018-08-30 9:23 ` Patrick Bellasi
2018-08-30 9:57 ` Quentin Perret
2018-08-30 10:18 ` Patrick Bellasi
2018-09-06 6:06 ` Dietmar Eggemann
2018-09-06 9:29 ` Quentin Perret
2018-09-06 23:49 ` Dietmar Eggemann
2018-09-07 8:24 ` Quentin Perret
2018-08-20 9:44 ` [PATCH v6 08/14] sched/fair: Clean-up update_sg_lb_stats parameters Quentin Perret
2018-08-20 9:44 ` [PATCH v6 09/14] sched: Add over-utilization/tipping point indicator Quentin Perret
2018-08-20 9:44 ` [PATCH v6 10/14] sched/cpufreq: Refactor the utilization aggregation method Quentin Perret
2018-09-10 9:53 ` Rafael J. Wysocki
2018-09-10 10:07 ` Quentin Perret
2018-09-10 10:25 ` Rafael J. Wysocki
2018-08-20 9:44 ` [PATCH v6 11/14] sched/fair: Introduce an energy estimation helper function Quentin Perret
2018-08-20 9:44 ` [PATCH v6 12/14] sched/fair: Select an energy-efficient CPU on task wake-up Quentin Perret
2018-08-20 9:44 ` [PATCH v6 13/14] sched/topology: Make Energy Aware Scheduling depend on schedutil Quentin Perret
2018-09-04 10:59 ` Quentin Perret
2018-09-06 9:18 ` Rafael J. Wysocki
2018-09-06 14:38 ` Quentin Perret
2018-09-07 8:52 ` Rafael J. Wysocki
2018-09-07 8:56 ` Rafael J. Wysocki
2018-09-07 9:02 ` Quentin Perret
2018-09-07 15:29 ` Quentin Perret
2018-09-09 20:13 ` Rafael J. Wysocki
2018-09-10 8:24 ` Quentin Perret
2018-09-10 8:55 ` Rafael J. Wysocki
2018-09-10 9:43 ` Quentin Perret
2018-08-20 9:44 ` [PATCH v6 14/14] OPTIONAL: cpufreq: dt: Register an Energy Model Quentin Perret
2018-09-10 9:12 ` [PATCH v6 00/14] Energy Aware Scheduling Rafael J. Wysocki
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