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Message-ID: <1615618.km3VldYPyl@vostro.rjw.lan>
Date: Sat, 17 May 2014 00:31:34 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Eduardo Valentin <edubezval@...il.com>
Cc: Amit Daniel Kachhap <amit.daniel@...sung.com>,
linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
lenb@...nel.org, rui.zhang@...el.com, eduardo.valentin@...com
Subject: Re: [RFC PATCH 1/5] thermal: cpu_cooling: Support passing driver private data.
On Thursday, May 15, 2014 02:33:07 PM Eduardo Valentin wrote:
> Hello Amit,
>
>
> On Thu, May 08, 2014 at 08:07:56PM +0530, Amit Daniel Kachhap wrote:
> > This patch is in preparation to add notfication support for cpufrequency
> > cooling changes. This change also removes the unnecessary exposing of
> > internal housekeeping structure via thermal_cooling_device->devdata to the
> > users of cpufreq cooling APIs.
> >
> > Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> > ---
> > drivers/thermal/cpu_cooling.c | 79 +++++++++++++++----
> > drivers/thermal/db8500_cpufreq_cooling.c | 2 +-
> > drivers/thermal/samsung/exynos_thermal_common.c | 2 +-
> > drivers/thermal/ti-soc-thermal/ti-thermal-common.c | 2 +-
> > include/linux/cpu_cooling.h | 5 +-
> > 5 files changed, 68 insertions(+), 22 deletions(-)
> >
> > diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
> > index 4246262..21f44d4 100644
> > --- a/drivers/thermal/cpu_cooling.c
> > +++ b/drivers/thermal/cpu_cooling.c
> > @@ -50,16 +50,18 @@ struct cpufreq_cooling_device {
> > unsigned int cpufreq_state;
> > unsigned int cpufreq_val;
> > struct cpumask allowed_cpus;
> > + struct list_head node;
> > };
> > static DEFINE_IDR(cpufreq_idr);
> > static DEFINE_MUTEX(cooling_cpufreq_lock);
> >
> > -static unsigned int cpufreq_dev_count;
> > -
> > /* notify_table passes value to the CPUFREQ_ADJUST callback function. */
> > #define NOTIFY_INVALID NULL
> > static struct cpufreq_cooling_device *notify_device;
> >
> > +/* A list to hold all the cpufreq cooling devices registered */
> > +static LIST_HEAD(cpufreq_cooling_list);
> > +
> > /**
> > * get_idr - function to get a unique id.
> > * @idr: struct idr * handle used to create a id.
> > @@ -357,12 +359,23 @@ static int cpufreq_thermal_notifier(struct notifier_block *nb,
> > static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
> > unsigned long *state)
> > {
> > - struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
> > - struct cpumask *mask = &cpufreq_device->allowed_cpus;
> > + struct cpufreq_cooling_device *cpufreq_device = NULL;
> > + struct cpumask *mask = NULL;
> > unsigned int cpu;
> > unsigned int count = 0;
> > int ret;
> >
> > + mutex_lock(&cooling_cpufreq_lock);
> > + list_for_each_entry(cpufreq_device, &cpufreq_cooling_list, node)
> > + if (cpufreq_device->cool_dev == cdev)
> > + break;
> > + mutex_unlock(&cooling_cpufreq_lock);
> > + if (!cpufreq_device) {
> > + /* Cooling device pointer not found */
> > + return -EINVAL;
> > + }
> > +
> > + mask = &cpufreq_device->allowed_cpus;
> > cpu = cpumask_any(mask);
> >
> > ret = get_property(cpu, 0, &count, GET_MAXL);
> > @@ -386,7 +399,17 @@ static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
> > static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
> > unsigned long *state)
> > {
> > - struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
> > + struct cpufreq_cooling_device *cpufreq_device = NULL;
> > +
> > + mutex_lock(&cooling_cpufreq_lock);
> > + list_for_each_entry(cpufreq_device, &cpufreq_cooling_list, node)
> > + if (cpufreq_device->cool_dev == cdev)
> > + break;
> > + mutex_unlock(&cooling_cpufreq_lock);
> > + if (!cpufreq_device) {
> > + /* Cooling device pointer not found */
> > + return -EINVAL;
> > + }
> >
> > *state = cpufreq_device->cpufreq_state;
> >
> > @@ -406,7 +429,17 @@ static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
> > static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
> > unsigned long state)
> > {
> > - struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
> > + struct cpufreq_cooling_device *cpufreq_device = NULL;
> > +
> > + mutex_lock(&cooling_cpufreq_lock);
> > + list_for_each_entry(cpufreq_device, &cpufreq_cooling_list, node)
> > + if (cpufreq_device->cool_dev == cdev)
> > + break;
> > + mutex_unlock(&cooling_cpufreq_lock);
> > + if (!cpufreq_device) {
> > + /* Cooling device pointer not found */
> > + return -EINVAL;
> > + }
> >
> > return cpufreq_apply_cooling(cpufreq_device, state);
> > }
> > @@ -427,6 +460,7 @@ static struct notifier_block thermal_cpufreq_notifier_block = {
> > * __cpufreq_cooling_register - helper function to create cpufreq cooling device
> > * @np: a valid struct device_node to the cooling device device tree node
> > * @clip_cpus: cpumask of cpus where the frequency constraints will happen.
> > + * @devdata: driver data pointer
> > *
> > * This interface function registers the cpufreq cooling device with the name
> > * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
> > @@ -438,7 +472,7 @@ static struct notifier_block thermal_cpufreq_notifier_block = {
> > */
> > static struct thermal_cooling_device *
> > __cpufreq_cooling_register(struct device_node *np,
> > - const struct cpumask *clip_cpus)
> > + const struct cpumask *clip_cpus, void *devdata)
> > {
> > struct thermal_cooling_device *cool_dev;
> > struct cpufreq_cooling_device *cpufreq_dev = NULL;
> > @@ -477,7 +511,7 @@ __cpufreq_cooling_register(struct device_node *np,
> > snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d",
> > cpufreq_dev->id);
> >
> > - cool_dev = thermal_of_cooling_device_register(np, dev_name, cpufreq_dev,
> > + cool_dev = thermal_of_cooling_device_register(np, dev_name, devdata,
> > &cpufreq_cooling_ops);
> > if (IS_ERR(cool_dev)) {
> > release_idr(&cpufreq_idr, cpufreq_dev->id);
> > @@ -489,10 +523,11 @@ __cpufreq_cooling_register(struct device_node *np,
> > mutex_lock(&cooling_cpufreq_lock);
> >
> > /* Register the notifier for first cpufreq cooling device */
> > - if (cpufreq_dev_count == 0)
> > + if (list_empty(&cpufreq_cooling_list))
> > cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
> > CPUFREQ_POLICY_NOTIFIER);
> > - cpufreq_dev_count++;
> > +
> > + list_add(&cpufreq_dev->node, &cpufreq_cooling_list);
> >
> > mutex_unlock(&cooling_cpufreq_lock);
> >
> > @@ -502,6 +537,7 @@ __cpufreq_cooling_register(struct device_node *np,
> > /**
> > * cpufreq_cooling_register - function to create cpufreq cooling device.
> > * @clip_cpus: cpumask of cpus where the frequency constraints will happen.
> > + * @devdata: driver data pointer
> > *
> > * This interface function registers the cpufreq cooling device with the name
> > * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
> > @@ -511,9 +547,9 @@ __cpufreq_cooling_register(struct device_node *np,
> > * on failure, it returns a corresponding ERR_PTR().
> > */
> > struct thermal_cooling_device *
> > -cpufreq_cooling_register(const struct cpumask *clip_cpus)
> > +cpufreq_cooling_register(const struct cpumask *clip_cpus, void *devdata)
> > {
> > - return __cpufreq_cooling_register(NULL, clip_cpus);
> > + return __cpufreq_cooling_register(NULL, clip_cpus, devdata);
> > }
> > EXPORT_SYMBOL_GPL(cpufreq_cooling_register);
> >
> > @@ -537,7 +573,7 @@ of_cpufreq_cooling_register(struct device_node *np,
> > if (!np)
> > return ERR_PTR(-EINVAL);
> >
> > - return __cpufreq_cooling_register(np, clip_cpus);
> > + return __cpufreq_cooling_register(np, clip_cpus, NULL);
> > }
> > EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register);
> >
> > @@ -554,17 +590,26 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
> > if (!cdev)
> > return;
> >
> > - cpufreq_dev = cdev->devdata;
> > mutex_lock(&cooling_cpufreq_lock);
> > - cpufreq_dev_count--;
> > +
> > + list_for_each_entry(cpufreq_dev, &cpufreq_cooling_list, node)
> > + if (cpufreq_dev->cool_dev == cdev)
> > + break;
> > +
> > + if (!cpufreq_dev) {
> > + /* Cooling device pointer not found */
> > + mutex_unlock(&cooling_cpufreq_lock);
> > + return;
> > + }
>
> Because you are adding several times the same code to search through
> your list of cdevs, I recommend adding at least a helper function to
> perform this recurring operation.
Violently agreed.
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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