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Date: Thu, 10 Dec 2020 19:51:11 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Ulf Hansson <ulf.hansson@...aro.org>,
Thierry Strudel <tstrudel@...gle.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Kevin Hilman <khilman@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Linux PM <linux-pm@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] PM: domains: create debugfs nodes when adding power domains
On Thu, Dec 10, 2020 at 8:18 AM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Tue, 8 Dec 2020 at 20:20, Thierry Strudel <tstrudel@...gle.com> wrote:
> >
> > 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
>
> Thierry, thanks for fixing this!
>
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
Applied now (as 5.11-rc material), thanks!
> > ---
> > 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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