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Date: Tue, 31 May 2016 10:43:40 +0530
From: Keerthy <a0393675@...com>
To: Eduardo Valentin <edubezval@...il.com>,
Rui Zhang <rui.zhang@...el.com>
CC: Linux PM <linux-pm@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3 04/48] thermal: core: use dev.groups to manage always
present tz attributes
On Tuesday 31 May 2016 03:45 AM, Eduardo Valentin wrote:
> Thermal zones attributes are all being created using
> device_create_file(). This has the disadvantage of making the code
> complicated and sometimes we may miss the cleanup of them.
>
> This patch starts to move the thermal zone sysfs attributes to the
> dev.groups, so Linux device core manage them for us. For now, this patch
> only moves those attributes are always present regardless of thermal
> zone condition.
>
> This change has also the advantage of cleaning up the thermal zone
> parameters sysfs entries that are left unclean after device
> registration.
I bisected. This is the commit which seems to break boot when thermal
modules are built in kernel.
>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: linux-pm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Eduardo Valentin <edubezval@...il.com>
> ---
> drivers/thermal/thermal_core.c | 86 ++++++++++++++++--------------------------
> 1 file changed, 33 insertions(+), 53 deletions(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 3ce7882..926442e 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -989,42 +989,46 @@ create_s32_tzp_attr(slope);
> create_s32_tzp_attr(offset);
> #undef create_s32_tzp_attr
>
> +/*
> + * These are thermal zone device attributes that will always be present.
> + * All the attributes created for tzp (create_s32_tzp_attr) also are always
> + * present on the sysfs interface.
> + */
> static DEVICE_ATTR(type, 0444, type_show, NULL);
> static DEVICE_ATTR(temp, 0444, temp_show, NULL);
> -static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
> -static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
> static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
> static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
> -static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
> static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
> sustainable_power_store);
>
> -static struct device_attribute *dev_tzp_attrs[] = {
> - &dev_attr_sustainable_power,
> - &dev_attr_k_po,
> - &dev_attr_k_pu,
> - &dev_attr_k_i,
> - &dev_attr_k_d,
> - &dev_attr_integral_cutoff,
> - &dev_attr_slope,
> - &dev_attr_offset,
> -};
> -
> -static int create_tzp_attrs(struct device *dev)
> -{
> - int i;
> +/* These thermal zone device attributes are created based on conditions */
> +static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
> +static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
> +static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
>
> - for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
> - int ret;
> - struct device_attribute *dev_attr = dev_tzp_attrs[i];
> +static struct attribute *thermal_zone_dev_attrs[] = {
> + &dev_attr_type.attr,
> + &dev_attr_temp.attr,
> + &dev_attr_policy.attr,
> + &dev_attr_available_policies.attr,
> + &dev_attr_sustainable_power.attr,
> + &dev_attr_k_po.attr,
> + &dev_attr_k_pu.attr,
> + &dev_attr_k_i.attr,
> + &dev_attr_k_d.attr,
> + &dev_attr_integral_cutoff.attr,
> + &dev_attr_slope.attr,
> + &dev_attr_offset.attr,
> +};
>
> - ret = device_create_file(dev, dev_attr);
> - if (ret)
> - return ret;
> - }
> +static struct attribute_group thermal_zone_attribute_group = {
> + .attrs = thermal_zone_dev_attrs,
> +};
>
> - return 0;
> -}
> +static const struct attribute_group *thermal_zone_attribute_groups[] = {
> + &thermal_zone_attribute_group,
> + NULL
> +};
>
> /**
> * power_actor_get_max_power() - get the maximum power that a cdev can consume
> @@ -1846,6 +1850,9 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
> tz->trips = trips;
> tz->passive_delay = passive_delay;
> tz->polling_delay = polling_delay;
> +
> + /* Add nodes that are always present via .groups */
> + tz->device.groups = thermal_zone_attribute_groups;
> /* A new thermal zone needs to be updated anyway. */
> atomic_set(&tz->need_update, 1);
>
> @@ -1892,29 +1899,6 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
> goto unregister;
> }
>
> - result = device_create_file(&tz->device, &dev_attr_type);
> - if (result)
> - goto unregister;
> -
> - result = device_create_file(&tz->device, &dev_attr_temp);
> - if (result)
> - goto unregister;
> -
> - /* Create policy attribute */
> - result = device_create_file(&tz->device, &dev_attr_policy);
> - if (result)
> - goto unregister;
> -
> - /* Create available_policies attribute */
> - result = device_create_file(&tz->device, &dev_attr_available_policies);
> - if (result)
> - goto unregister;
> -
> - /* Add thermal zone params */
> - result = create_tzp_attrs(&tz->device);
> - if (result)
> - goto unregister;
> -
> /* Update 'this' zone's governor information */
> mutex_lock(&thermal_governor_lock);
>
> @@ -2009,12 +1993,8 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
>
> thermal_zone_device_set_polling(tz, 0);
>
> - device_remove_file(&tz->device, &dev_attr_type);
> - device_remove_file(&tz->device, &dev_attr_temp);
> if (tz->ops->get_mode)
> device_remove_file(&tz->device, &dev_attr_mode);
> - device_remove_file(&tz->device, &dev_attr_policy);
> - device_remove_file(&tz->device, &dev_attr_available_policies);
> remove_trip_attrs(tz);
> thermal_set_governor(tz, NULL);
>
>
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