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PM / Domains: Add support for CPU devices to genpd

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To enable a CPU device to be attached to a PM domain managed by genpd,
make a few changes to it for convenience.

To be able to quickly find out what CPUs are attached to a genpd,
which typically becomes useful from a genpd governor as subsequent
changes are about to show, add a cpumask to struct generic_pm_domain
to be updated when a CPU device gets attached to the genpd containing
that cpumask. Also, propagate the cpumask changes upwards in the
domain hierarchy to the master PM domains. This way, the cpumask for
a genpd hierarchically reflects all CPUs attached to the topology
below it.

Finally, make this an opt-in feature, to avoid having to manage CPUs
and the cpumask for a genpd that don't need it. To that end, add
a new genpd configuration bit, GENPD_FLAG_CPU_DOMAIN.

Co-developed-by: Lina Iyer <lina.iyer@linaro.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2019-03-27 15:35:46 +01:00 • committed by Rafael J. Wysocki
parent 49a27e2790
commit eb594b7325
2 changed files with 77 additions and 1 deletions
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13
include/linux/pm_domain.h
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@ -16,6 +16,7 @@
#include <linux/of.h>
#include <linux/notifier.h>
#include <linux/spinlock.h>
#include <linux/cpumask.h>
/*
* Flags to control the behaviour of a genpd.
@ -42,11 +43,22 @@
* GENPD_FLAG_ACTIVE_WAKEUP: Instructs genpd to keep the PM domain powered
* on, in case any of its attached devices is used
* in the wakeup path to serve system wakeups.
*
* GENPD_FLAG_CPU_DOMAIN: Instructs genpd that it should expect to get
* devices attached, which may belong to CPUs or
* possibly have subdomains with CPUs attached.
* This flag enables the genpd backend driver to
* deploy idle power management support for CPUs
* and groups of CPUs. Note that, the backend
* driver must then comply with the so called,
* last-man-standing algorithm, for the CPUs in the
* PM domain.
*/
#define GENPD_FLAG_PM_CLK (1U << 0)
#define GENPD_FLAG_IRQ_SAFE (1U << 1)
#define GENPD_FLAG_ALWAYS_ON (1U << 2)
#define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3)
#define GENPD_FLAG_CPU_DOMAIN (1U << 4)
enum gpd_status {
GPD_STATE_ACTIVE = 0, /* PM domain is active */
@ -94,6 +106,7 @@ struct generic_pm_domain {
unsigned int suspended_count; /* System suspend device counter */
unsigned int prepared_count; /* Suspend counter of prepared devices */
unsigned int performance_state; /* Aggregated max performance state */
cpumask_var_t cpus; /* A cpumask of the attached CPUs */
int (*power_off)(struct generic_pm_domain *domain);
int (*power_on)(struct generic_pm_domain *domain);
struct opp_table *opp_table; /* OPP table of the genpd */