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Message-Id: <20201208191955.2466057-1-tstrudel@google.com>
Date: Tue, 8 Dec 2020 11:19:55 -0800
From: Thierry Strudel <tstrudel@...gle.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Kevin Hilman <khilman@...nel.org>,
Ulf Hansson <ulf.hansson@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
Thierry Strudel <tstrudel@...gle.com>
Subject: [PATCH v4] PM: domains: create debugfs nodes when adding power domains
debugfs nodes were created in genpd_debug_init alled in late_initcall
preventing power domains registered though loadable modules to have
a debugfs entry.
Create/remove debugfs nodes when the power domain is added/removed
to/from the internal gpd_list.
Signed-off-by: Thierry Strudel <tstrudel@...gle.com>
Change-Id: I8a2e0616746afe2a6bbd9c24bc3a0eaa84725a75
---
v2: fix forward declaration and genpd_debugfs_dir being NULL - Ulf
v3: remove extra trailing char added by mistake in v2 - kernel test robot
v4: cleanup includes and regroup CONFIG_DEBUG_FS CPP blocks - Greg
drivers/base/power/domain.c | 73 +++++++++++++++++++++++--------------
1 file changed, 45 insertions(+), 28 deletions(-)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 2cb5e04cf86c..49c87607cba7 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -21,6 +21,7 @@
#include <linux/suspend.h>
#include <linux/export.h>
#include <linux/cpu.h>
+#include <linux/debugfs.h>
#include "power.h"
@@ -210,6 +211,18 @@ static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
}
#ifdef CONFIG_DEBUG_FS
+static struct dentry *genpd_debugfs_dir;
+
+static void genpd_debug_add(struct generic_pm_domain *genpd);
+
+static void genpd_debug_remove(struct generic_pm_domain *genpd)
+{
+ struct dentry *d;
+
+ d = debugfs_lookup(genpd->name, genpd_debugfs_dir);
+ debugfs_remove(d);
+}
+
static void genpd_update_accounting(struct generic_pm_domain *genpd)
{
ktime_t delta, now;
@@ -234,6 +247,8 @@ static void genpd_update_accounting(struct generic_pm_domain *genpd)
genpd->accounting_time = now;
}
#else
+static inline void genpd_debug_add(struct generic_pm_domain *genpd) {}
+static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {}
static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {}
#endif
@@ -1827,6 +1842,7 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
mutex_lock(&gpd_list_lock);
list_add(&genpd->gpd_list_node, &gpd_list);
+ genpd_debug_add(genpd);
mutex_unlock(&gpd_list_lock);
return 0;
@@ -1860,6 +1876,7 @@ static int genpd_remove(struct generic_pm_domain *genpd)
kfree(link);
}
+ genpd_debug_remove(genpd);
list_del(&genpd->gpd_list_node);
genpd_unlock(genpd);
cancel_work_sync(&genpd->power_off_work);
@@ -2764,14 +2781,6 @@ core_initcall(genpd_bus_init);
/*** debugfs support ***/
#ifdef CONFIG_DEBUG_FS
-#include <linux/pm.h>
-#include <linux/device.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <linux/init.h>
-#include <linux/kobject.h>
-static struct dentry *genpd_debugfs_dir;
-
/*
* TODO: This function is a slightly modified version of rtpm_status_show
* from sysfs.c, so generalize it.
@@ -3047,9 +3056,34 @@ DEFINE_SHOW_ATTRIBUTE(total_idle_time);
DEFINE_SHOW_ATTRIBUTE(devices);
DEFINE_SHOW_ATTRIBUTE(perf_state);
-static int __init genpd_debug_init(void)
+static void genpd_debug_add(struct generic_pm_domain *genpd)
{
struct dentry *d;
+
+ if (!genpd_debugfs_dir)
+ return;
+
+ d = debugfs_create_dir(genpd->name, genpd_debugfs_dir);
+
+ debugfs_create_file("current_state", 0444,
+ d, genpd, &status_fops);
+ debugfs_create_file("sub_domains", 0444,
+ d, genpd, &sub_domains_fops);
+ debugfs_create_file("idle_states", 0444,
+ d, genpd, &idle_states_fops);
+ debugfs_create_file("active_time", 0444,
+ d, genpd, &active_time_fops);
+ debugfs_create_file("total_idle_time", 0444,
+ d, genpd, &total_idle_time_fops);
+ debugfs_create_file("devices", 0444,
+ d, genpd, &devices_fops);
+ if (genpd->set_performance_state)
+ debugfs_create_file("perf_state", 0444,
+ d, genpd, &perf_state_fops);
+}
+
+static int __init genpd_debug_init(void)
+{
struct generic_pm_domain *genpd;
genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
@@ -3057,25 +3091,8 @@ static int __init genpd_debug_init(void)
debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir,
NULL, &summary_fops);
- list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
- d = debugfs_create_dir(genpd->name, genpd_debugfs_dir);
-
- debugfs_create_file("current_state", 0444,
- d, genpd, &status_fops);
- debugfs_create_file("sub_domains", 0444,
- d, genpd, &sub_domains_fops);
- debugfs_create_file("idle_states", 0444,
- d, genpd, &idle_states_fops);
- debugfs_create_file("active_time", 0444,
- d, genpd, &active_time_fops);
- debugfs_create_file("total_idle_time", 0444,
- d, genpd, &total_idle_time_fops);
- debugfs_create_file("devices", 0444,
- d, genpd, &devices_fops);
- if (genpd->set_performance_state)
- debugfs_create_file("perf_state", 0444,
- d, genpd, &perf_state_fops);
- }
+ list_for_each_entry(genpd, &gpd_list, gpd_list_node)
+ genpd_debug_add(genpd);
return 0;
}
--
2.29.2.576.ga3fc446d84-goog
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