linux-kernel - [PATCH 3/3] PM: domains: Drop/restore performance state votes for devices at system PM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed,  2 Jun 2021 12:12:15 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-pm@...r.kernel.org
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Dmitry Osipenko <digetx@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Roja Rani Yarubandi <rojay@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] PM: domains: Drop/restore performance state votes for devices at system PM

Recent changes in genpd drops and restore performance state votes for
devices during runtime PM.

For the similar reasons, but to avoid the same kind of boilerplate code in
device PM callbacks for system sleep in subsystems/drivers, let's drop and
restore performance states votes in genpd for the attached devices during
system sleep.

Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---
 drivers/base/power/domain.c | 14 ++++++++++++++
 include/linux/pm_domain.h   |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 81b9d4652b90..8487f1690deb 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1162,6 +1162,7 @@ static int genpd_prepare(struct device *dev)
  */
 static int genpd_finish_suspend(struct device *dev, bool poweroff)
 {
+	struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
 	struct generic_pm_domain *genpd;
 	int ret = 0;
 
@@ -1192,6 +1193,7 @@ static int genpd_finish_suspend(struct device *dev, bool poweroff)
 	}
 
 	genpd_lock(genpd);
+	gpd_data->pm_saved_pstate = genpd_drop_performance_state(dev);
 	genpd->suspended_count++;
 	genpd_sync_power_off(genpd, true, 0);
 	genpd_unlock(genpd);
@@ -1221,6 +1223,7 @@ static int genpd_suspend_noirq(struct device *dev)
  */
 static int genpd_resume_noirq(struct device *dev)
 {
+	struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
 	struct generic_pm_domain *genpd;
 	int ret;
 
@@ -1236,6 +1239,8 @@ static int genpd_resume_noirq(struct device *dev)
 	genpd_lock(genpd);
 	genpd_sync_power_on(genpd, true, 0);
 	genpd->suspended_count--;
+	if (gpd_data->pm_saved_pstate)
+		genpd_set_performance_state(dev, gpd_data->pm_saved_pstate);
 	genpd_unlock(genpd);
 
 	if (genpd->dev_ops.stop && genpd->dev_ops.start &&
@@ -1331,6 +1336,7 @@ static int genpd_poweroff_noirq(struct device *dev)
  */
 static int genpd_restore_noirq(struct device *dev)
 {
+	struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
 	struct generic_pm_domain *genpd;
 	int ret = 0;
 
@@ -1355,6 +1361,8 @@ static int genpd_restore_noirq(struct device *dev)
 	}
 
 	genpd_sync_power_on(genpd, true, 0);
+	if (gpd_data->pm_saved_pstate)
+		genpd_set_performance_state(dev, gpd_data->pm_saved_pstate);
 	genpd_unlock(genpd);
 
 	if (genpd->dev_ops.stop && genpd->dev_ops.start &&
@@ -1400,23 +1408,29 @@ static void genpd_complete(struct device *dev)
 static void genpd_switch_state(struct device *dev, bool suspend)
 {
 	struct generic_pm_domain *genpd;
+	struct generic_pm_domain_data *gpd_data;
 	bool use_lock;
 
 	genpd = dev_to_genpd_safe(dev);
 	if (!genpd)
 		return;
 
+	gpd_data = dev_gpd_data(dev);
+
 	use_lock = genpd_is_irq_safe(genpd);
 
 	if (use_lock)
 		genpd_lock(genpd);
 
 	if (suspend) {
+		gpd_data->pm_saved_pstate = genpd_drop_performance_state(dev);
 		genpd->suspended_count++;
 		genpd_sync_power_off(genpd, use_lock, 0);
 	} else {
 		genpd_sync_power_on(genpd, use_lock, 0);
 		genpd->suspended_count--;
+		if(gpd_data->pm_saved_pstate)
+			genpd_set_performance_state(dev, gpd_data->pm_saved_pstate);
 	}
 
 	if (use_lock)
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index c3d6c15788a3..3eb215ac8adf 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -199,6 +199,7 @@ struct generic_pm_domain_data {
 	int cpu;
 	unsigned int performance_state;
 	unsigned int rpm_saved_pstate;
+	unsigned int pm_saved_pstate;
 	ktime_t	next_wakeup;
 	void *data;
 };
-- 
2.25.1