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Message-ID: <CADGdYn4JuNOCX8cBgWXXrVZHQtSPaZoW9sBDs_v=sizWNeGd5Q@mail.gmail.com>
Date: Mon, 19 May 2014 14:26:31 +0530
From: amit daniel kachhap <amit.daniel@...sung.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Eduardo Valentin <edubezval@...il.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 Sat, May 17, 2014 at 4:01 AM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> 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.
ok will use wrapper function in next iteration.
>
> --
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.
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