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Message-ID: <46571375.fMDQidcC6G@rjwysocki.net>
Date: Mon, 29 Jul 2024 18:25:03 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>, Lukasz Luba <lukasz.luba@....com>
Subject:
[PATCH v1 1/3] thermal: core: Store trip sysfs attributes in
thermal_trip_desc
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Instead of allocating memory for trip point sysfs attributes separately,
store them in struct thermal_trip_desc for each trip individually which
allows a few extra memory allocations to be avoided.
No intentional functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
drivers/thermal/thermal_core.h | 23 ++++----
drivers/thermal/thermal_sysfs.c | 103 ++++++++++++----------------------------
2 files changed, 45 insertions(+), 81 deletions(-)
Index: linux-pm/drivers/thermal/thermal_core.h
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.h
+++ linux-pm/drivers/thermal/thermal_core.h
@@ -15,8 +15,20 @@
#include "thermal_netlink.h"
#include "thermal_debugfs.h"
+struct thermal_attr {
+ struct device_attribute attr;
+ char name[THERMAL_NAME_LENGTH];
+};
+
+struct thermal_trip_attrs {
+ struct thermal_attr type;
+ struct thermal_attr temp;
+ struct thermal_attr hyst;
+};
+
struct thermal_trip_desc {
struct thermal_trip trip;
+ struct thermal_trip_attrs trip_attrs;
struct list_head notify_list_node;
int notify_temp;
int threshold;
@@ -56,9 +68,6 @@ struct thermal_governor {
* @device: &struct device for this thermal zone
* @removal: removal completion
* @resume: resume completion
- * @trip_temp_attrs: attributes for trip points for sysfs: trip temperature
- * @trip_type_attrs: attributes for trip points for sysfs: trip type
- * @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
* @mode: current mode of this thermal zone
* @devdata: private pointer for device private data
* @num_trips: number of trip points the thermal zone supports
@@ -102,9 +111,6 @@ struct thermal_zone_device {
struct completion removal;
struct completion resume;
struct attribute_group trips_attribute_group;
- struct thermal_attr *trip_temp_attrs;
- struct thermal_attr *trip_type_attrs;
- struct thermal_attr *trip_hyst_attrs;
enum thermal_device_mode mode;
void *devdata;
int num_trips;
@@ -188,11 +194,6 @@ int for_each_thermal_governor(int (*cb)(
struct thermal_zone_device *thermal_zone_get_by_id(int id);
-struct thermal_attr {
- struct device_attribute attr;
- char name[THERMAL_NAME_LENGTH];
-};
-
static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
{
return cdev->ops->get_requested_power && cdev->ops->state2power &&
Index: linux-pm/drivers/thermal/thermal_sysfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_sysfs.c
+++ linux-pm/drivers/thermal/thermal_sysfs.c
@@ -382,87 +382,55 @@ static const struct attribute_group *the
*/
static int create_trip_attrs(struct thermal_zone_device *tz)
{
- const struct thermal_trip_desc *td;
+ struct thermal_trip_desc *td;
struct attribute **attrs;
-
- /* This function works only for zones with at least one trip */
- if (tz->num_trips <= 0)
- return -EINVAL;
-
- tz->trip_type_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_type_attrs),
- GFP_KERNEL);
- if (!tz->trip_type_attrs)
- return -ENOMEM;
-
- tz->trip_temp_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_temp_attrs),
- GFP_KERNEL);
- if (!tz->trip_temp_attrs) {
- kfree(tz->trip_type_attrs);
- return -ENOMEM;
- }
-
- tz->trip_hyst_attrs = kcalloc(tz->num_trips,
- sizeof(*tz->trip_hyst_attrs),
- GFP_KERNEL);
- if (!tz->trip_hyst_attrs) {
- kfree(tz->trip_type_attrs);
- kfree(tz->trip_temp_attrs);
- return -ENOMEM;
- }
+ int i;
attrs = kcalloc(tz->num_trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
- if (!attrs) {
- kfree(tz->trip_type_attrs);
- kfree(tz->trip_temp_attrs);
- kfree(tz->trip_hyst_attrs);
+ if (!attrs)
return -ENOMEM;
- }
+ i = 0;
for_each_trip_desc(tz, td) {
- int indx = thermal_zone_trip_id(tz, &td->trip);
+ struct thermal_trip_attrs *trip_attrs = &td->trip_attrs;
/* create trip type attribute */
- snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
- "trip_point_%d_type", indx);
+ snprintf(trip_attrs->type.name, THERMAL_NAME_LENGTH,
+ "trip_point_%d_type", i);
- sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
- tz->trip_type_attrs[indx].attr.attr.name =
- tz->trip_type_attrs[indx].name;
- tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
- tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
- attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
+ sysfs_attr_init(&trip_attrs->type.attr.attr);
+ trip_attrs->type.attr.attr.name = trip_attrs->type.name;
+ trip_attrs->type.attr.attr.mode = S_IRUGO;
+ trip_attrs->type.attr.show = trip_point_type_show;
+ attrs[i] = &trip_attrs->type.attr.attr;
/* create trip temp attribute */
- snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
- "trip_point_%d_temp", indx);
+ snprintf(trip_attrs->temp.name, THERMAL_NAME_LENGTH,
+ "trip_point_%d_temp", i);
- sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
- tz->trip_temp_attrs[indx].attr.attr.name =
- tz->trip_temp_attrs[indx].name;
- tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
- tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
+ sysfs_attr_init(&trip_attrs->temp.attr.attr);
+ trip_attrs->temp.attr.attr.name = trip_attrs->temp.name;
+ trip_attrs->temp.attr.attr.mode = S_IRUGO;
+ trip_attrs->temp.attr.show = trip_point_temp_show;
if (td->trip.flags & THERMAL_TRIP_FLAG_RW_TEMP) {
- tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
- tz->trip_temp_attrs[indx].attr.store =
- trip_point_temp_store;
+ trip_attrs->temp.attr.attr.mode |= S_IWUSR;
+ trip_attrs->temp.attr.store = trip_point_temp_store;
}
- attrs[indx + tz->num_trips] = &tz->trip_temp_attrs[indx].attr.attr;
+ attrs[i + tz->num_trips] = &trip_attrs->temp.attr.attr;
- snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
- "trip_point_%d_hyst", indx);
+ snprintf(trip_attrs->hyst.name, THERMAL_NAME_LENGTH,
+ "trip_point_%d_hyst", i);
- sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
- tz->trip_hyst_attrs[indx].attr.attr.name =
- tz->trip_hyst_attrs[indx].name;
- tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
- tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
+ sysfs_attr_init(&trip_attrs->hyst.attr.attr);
+ trip_attrs->hyst.attr.attr.name = trip_attrs->hyst.name;
+ trip_attrs->hyst.attr.attr.mode = S_IRUGO;
+ trip_attrs->hyst.attr.show = trip_point_hyst_show;
if (td->trip.flags & THERMAL_TRIP_FLAG_RW_HYST) {
- tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
- tz->trip_hyst_attrs[indx].attr.store =
- trip_point_hyst_store;
+ trip_attrs->hyst.attr.attr.mode |= S_IWUSR;
+ trip_attrs->hyst.attr.store = trip_point_hyst_store;
}
- attrs[indx + tz->num_trips * 2] =
- &tz->trip_hyst_attrs[indx].attr.attr;
+ attrs[i + 2 * tz->num_trips] = &trip_attrs->hyst.attr.attr;
+ i++;
}
attrs[tz->num_trips * 3] = NULL;
@@ -479,13 +447,8 @@ static int create_trip_attrs(struct ther
*/
static void destroy_trip_attrs(struct thermal_zone_device *tz)
{
- if (!tz)
- return;
-
- kfree(tz->trip_type_attrs);
- kfree(tz->trip_temp_attrs);
- kfree(tz->trip_hyst_attrs);
- kfree(tz->trips_attribute_group.attrs);
+ if (tz)
+ kfree(tz->trips_attribute_group.attrs);
}
int thermal_zone_create_device_groups(struct thermal_zone_device *tz)
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