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Diffstat (limited to 'drivers/base/arch_topology.c')
-rw-r--r--drivers/base/arch_topology.c89
1 files changed, 83 insertions, 6 deletions
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index de8587cc119e..c1179edc0f3b 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -21,17 +21,94 @@
#include <linux/sched.h>
#include <linux/smp.h>
+static DEFINE_PER_CPU(struct scale_freq_data *, sft_data);
+static struct cpumask scale_freq_counters_mask;
+static bool scale_freq_invariant;
+
+static bool supports_scale_freq_counters(const struct cpumask *cpus)
+{
+ return cpumask_subset(cpus, &scale_freq_counters_mask);
+}
+
bool topology_scale_freq_invariant(void)
{
return cpufreq_supports_freq_invariance() ||
- arch_freq_counters_available(cpu_online_mask);
+ supports_scale_freq_counters(cpu_online_mask);
}
-__weak bool arch_freq_counters_available(const struct cpumask *cpus)
+static void update_scale_freq_invariant(bool status)
{
- return false;
+ if (scale_freq_invariant == status)
+ return;
+
+ /*
+ * Task scheduler behavior depends on frequency invariance support,
+ * either cpufreq or counter driven. If the support status changes as
+ * a result of counter initialisation and use, retrigger the build of
+ * scheduling domains to ensure the information is propagated properly.
+ */
+ if (topology_scale_freq_invariant() == status) {
+ scale_freq_invariant = status;
+ rebuild_sched_domains_energy();
+ }
}
-DEFINE_PER_CPU(unsigned long, freq_scale) = SCHED_CAPACITY_SCALE;
+
+void topology_set_scale_freq_source(struct scale_freq_data *data,
+ const struct cpumask *cpus)
+{
+ struct scale_freq_data *sfd;
+ int cpu;
+
+ /*
+ * Avoid calling rebuild_sched_domains() unnecessarily if FIE is
+ * supported by cpufreq.
+ */
+ if (cpumask_empty(&scale_freq_counters_mask))
+ scale_freq_invariant = topology_scale_freq_invariant();
+
+ for_each_cpu(cpu, cpus) {
+ sfd = per_cpu(sft_data, cpu);
+
+ /* Use ARCH provided counters whenever possible */
+ if (!sfd || sfd->source != SCALE_FREQ_SOURCE_ARCH) {
+ per_cpu(sft_data, cpu) = data;
+ cpumask_set_cpu(cpu, &scale_freq_counters_mask);
+ }
+ }
+
+ update_scale_freq_invariant(true);
+}
+EXPORT_SYMBOL_GPL(topology_set_scale_freq_source);
+
+void topology_clear_scale_freq_source(enum scale_freq_source source,
+ const struct cpumask *cpus)
+{
+ struct scale_freq_data *sfd;
+ int cpu;
+
+ for_each_cpu(cpu, cpus) {
+ sfd = per_cpu(sft_data, cpu);
+
+ if (sfd && sfd->source == source) {
+ per_cpu(sft_data, cpu) = NULL;
+ cpumask_clear_cpu(cpu, &scale_freq_counters_mask);
+ }
+ }
+
+ update_scale_freq_invariant(false);
+}
+EXPORT_SYMBOL_GPL(topology_clear_scale_freq_source);
+
+void topology_scale_freq_tick(void)
+{
+ struct scale_freq_data *sfd = *this_cpu_ptr(&sft_data);
+
+ if (sfd)
+ sfd->set_freq_scale();
+}
+
+DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE;
+EXPORT_PER_CPU_SYMBOL_GPL(arch_freq_scale);
void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
unsigned long max_freq)
@@ -47,13 +124,13 @@ void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
* want to update the scale factor with information from CPUFREQ.
* Instead the scale factor will be updated from arch_scale_freq_tick.
*/
- if (arch_freq_counters_available(cpus))
+ if (supports_scale_freq_counters(cpus))
return;
scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq;
for_each_cpu(i, cpus)
- per_cpu(freq_scale, i) = scale;
+ per_cpu(arch_freq_scale, i) = scale;
}
DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;