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PM: EM: Extend em_perf_domain with a flag field

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Merge the current "milliwatts" option into a "flag" field. This intends to
prepare the extension of this structure for inefficient states support in
the Energy Model.

Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Vincent Donnefort 2021-09-08 15:05:24 +01:00 committed by Rafael J. Wysocki
parent c8ed99533d
commit 88f7a89560
2 changed files with 14 additions and 5 deletions
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13
include/linux/energy_model.h
View File

@ -40,8 +40,7 @@ struct em_perf_state {
* struct em_perf_domain - Performance domain
* @table: List of performance states, in ascending order
* @nr_perf_states: Number of performance states
* @milliwatts: Flag indicating the power values are in milli-Watts
* or some other scale.
* @flags: See "em_perf_domain flags"
* @cpus: Cpumask covering the CPUs of the domain. It's here
* for performance reasons to avoid potential cache
* misses during energy calculations in the scheduler
@ -56,10 +55,18 @@ struct em_perf_state {
struct em_perf_domain {
struct em_perf_state *table;
int nr_perf_states;
int milliwatts;
unsigned long flags;
unsigned long cpus[];
};
/*
* em_perf_domain flags:
*
* EM_PERF_DOMAIN_MILLIWATTS: The power values are in milli-Watts or some
* other scale.
*/
#define EM_PERF_DOMAIN_MILLIWATTS BIT(0)
#define em_span_cpus(em) (to_cpumask((em)->cpus))
#ifdef CONFIG_ENERGY_MODEL

6
kernel/power/energy_model.c
View File

@ -56,7 +56,8 @@ DEFINE_SHOW_ATTRIBUTE(em_debug_cpus);
static int em_debug_units_show(struct seq_file *s, void *unused)
{
struct em_perf_domain *pd = s->private;
char *units = pd->milliwatts ? "milliWatts" : "bogoWatts";
char *units = (pd->flags & EM_PERF_DOMAIN_MILLIWATTS) ?
"milliWatts" : "bogoWatts";
seq_printf(s, "%s\n", units);
@ -330,7 +331,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
if (ret)
goto unlock;
dev->em_pd->milliwatts = milliwatts;
if (milliwatts)
dev->em_pd->flags |= EM_PERF_DOMAIN_MILLIWATTS;
em_debug_create_pd(dev);
dev_info(dev, "EM: created perf domain\n");