Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH v1 2/3] thermal/debugfs: Pass cooling device state to thermal_debug_cdev_add() | Date | Tue, 23 Apr 2024 20:00:57 +0200 |
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
If cdev_dt_seq_show() runs before the first state transition of a cooling device, it will not print any state residency information for it, even though it might be reasonably expected to print residency information for the initial state of the cooling device.
For this reason, rearrange the code to get the initial state of a cooling device at the registration time and pass it to thermal_debug_cdev_add(), so that the latter can create a duration record for that state which will allow cdev_dt_seq_show() to print its residency information.
Fixes: 755113d76786 ("thermal/debugfs: Add thermal cooling device debugfs information") Reported-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> --- drivers/thermal/thermal_core.c | 9 +++++++-- drivers/thermal/thermal_debugfs.c | 12 ++++++++++-- drivers/thermal/thermal_debugfs.h | 4 ++-- 3 files changed, 19 insertions(+), 6 deletions(-)
Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -928,6 +928,7 @@ __thermal_cooling_device_register(struct { struct thermal_cooling_device *cdev; struct thermal_zone_device *pos = NULL; + unsigned long current_state; int id, ret; if (!ops || !ops->get_max_state || !ops->get_cur_state || @@ -965,6 +966,10 @@ __thermal_cooling_device_register(struct if (ret) goto out_cdev_type; + ret = cdev->ops->get_cur_state(cdev, ¤t_state); + if (ret) + goto out_cdev_type; + thermal_cooling_device_setup_sysfs(cdev); ret = dev_set_name(&cdev->device, "cooling_device%d", cdev->id); @@ -978,6 +983,8 @@ __thermal_cooling_device_register(struct return ERR_PTR(ret); } + thermal_debug_cdev_add(cdev, current_state); + /* Add 'this' new cdev to the global cdev list */ mutex_lock(&thermal_list_lock); @@ -993,8 +1000,6 @@ __thermal_cooling_device_register(struct mutex_unlock(&thermal_list_lock); - thermal_debug_cdev_add(cdev); - return cdev; out_cooling_dev: Index: linux-pm/drivers/thermal/thermal_debugfs.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_debugfs.c +++ linux-pm/drivers/thermal/thermal_debugfs.c @@ -466,8 +466,9 @@ void thermal_debug_cdev_state_update(con * Allocates a cooling device object for debug, initializes the * statistics and create the entries in sysfs. * @cdev: a pointer to a cooling device + * @state: current state of the cooling device */ -void thermal_debug_cdev_add(struct thermal_cooling_device *cdev) +void thermal_debug_cdev_add(struct thermal_cooling_device *cdev, int state) { struct thermal_debugfs *thermal_dbg; struct cdev_debugfs *cdev_dbg; @@ -484,9 +485,16 @@ void thermal_debug_cdev_add(struct therm INIT_LIST_HEAD(&cdev_dbg->durations[i]); } - cdev_dbg->current_state = 0; + cdev_dbg->current_state = state; cdev_dbg->timestamp = ktime_get(); + /* + * Create a record for the initial cooling device state, so its + * duration will be printed by cdev_dt_seq_show() as expected if it + * runs before the first state transition. + */ + thermal_debugfs_cdev_record_get(thermal_dbg, cdev_dbg->durations, state); + debugfs_create_file("trans_table", 0400, thermal_dbg->d_top, thermal_dbg, &tt_fops); Index: linux-pm/drivers/thermal/thermal_debugfs.h =================================================================== --- linux-pm.orig/drivers/thermal/thermal_debugfs.h +++ linux-pm/drivers/thermal/thermal_debugfs.h @@ -2,7 +2,7 @@ #ifdef CONFIG_THERMAL_DEBUGFS void thermal_debug_init(void); -void thermal_debug_cdev_add(struct thermal_cooling_device *cdev); +void thermal_debug_cdev_add(struct thermal_cooling_device *cdev, int state); void thermal_debug_cdev_remove(struct thermal_cooling_device *cdev); void thermal_debug_cdev_state_update(const struct thermal_cooling_device *cdev, int state); void thermal_debug_tz_add(struct thermal_zone_device *tz); @@ -14,7 +14,7 @@ void thermal_debug_tz_trip_down(struct t void thermal_debug_update_stats(struct thermal_zone_device *tz); #else static inline void thermal_debug_init(void) {} -static inline void thermal_debug_cdev_add(struct thermal_cooling_device *cdev) {} +static inline void thermal_debug_cdev_add(struct thermal_cooling_device *cdev, int state) {} static inline void thermal_debug_cdev_remove(struct thermal_cooling_device *cdev) {} static inline void thermal_debug_cdev_state_update(const struct thermal_cooling_device *cdev, int state) {}
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