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Date: Tue, 10 Nov 2015 12:34:52 +0000
From: Javi Merino <javi.merino@....com>
To: Punit Agrawal <punit.agrawal@....com>
Cc: devicetree@...r.kernel.org, viresh.kumar@...aro.org,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
edubezval@...il.com, dawei.chien@...iatek.com,
Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v3 3/3] cpufreq: arm_big_little: Add support to register
a cpufreq cooling device
On Mon, Nov 09, 2015 at 05:29:23PM +0000, Punit Agrawal wrote:
> Register passive cooling devices when initialising cpufreq on
> big.LITTLE systems. If the device tree provides a dynamic power
> coefficient for the CPUs then the bound cooling device will support
> the extensions that allow it to be used with all the existing thermal
> governors including the power allocator governor.
>
> A cooling device will be created per individual frequency domain and
> can be bound to thermal zones via the thermal DT bindings.
>
> Signed-off-by: Punit Agrawal <punit.agrawal@....com>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> Cc: Sudeep Holla <sudeep.holla@....com>
> Cc: Eduardo Valentin <edubezval@...il.com>
> ---
> drivers/cpufreq/arm_big_little.c | 52 ++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 50 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
> index f1e42f8..72a2777 100644
> --- a/drivers/cpufreq/arm_big_little.c
> +++ b/drivers/cpufreq/arm_big_little.c
> @@ -23,6 +23,7 @@
> #include <linux/cpu.h>
> #include <linux/cpufreq.h>
> #include <linux/cpumask.h>
> +#include <linux/cpu_cooling.h>
> #include <linux/export.h>
> #include <linux/module.h>
> #include <linux/mutex.h>
> @@ -55,6 +56,10 @@ static bool bL_switching_enabled;
> #define ACTUAL_FREQ(cluster, freq) ((cluster == A7_CLUSTER) ? freq << 1 : freq)
> #define VIRT_FREQ(cluster, freq) ((cluster == A7_CLUSTER) ? freq >> 1 : freq)
>
> +struct private_data {
> + struct thermal_cooling_device *cdev;
> +};
> +
My first impression was that this is redundant and you could store the
pointer to cdev in driver_data itself. But seeing that it's mirroring
the structure in cpufreq-dt and it's simpler to do it this way I guess
it's ok to create this struct with only one pointer. You can add my
Reviewed-by: Javi Merino <javi.merino@....com>
> static struct cpufreq_arm_bL_ops *arm_bL_ops;
> static struct clk *clk[MAX_CLUSTERS];
> static struct cpufreq_frequency_table *freq_table[MAX_CLUSTERS + 1];
> @@ -440,6 +445,7 @@ static int bL_cpufreq_init(struct cpufreq_policy *policy)
> {
> u32 cur_cluster = cpu_to_cluster(policy->cpu);
> struct device *cpu_dev;
> + struct private_data *priv;
> int ret;
>
> cpu_dev = get_cpu_device(policy->cpu);
> @@ -457,9 +463,15 @@ static int bL_cpufreq_init(struct cpufreq_policy *policy)
> if (ret) {
> dev_err(cpu_dev, "CPU %d, cluster: %d invalid freq table\n",
> policy->cpu, cur_cluster);
> - put_cluster_clk_and_freq_table(cpu_dev);
> - return ret;
> + goto out_free_cpufreq_table;
> + }
> +
> + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> + if (!priv) {
> + ret = -ENOMEM;
> + goto out_free_cpufreq_table;
> }
> + policy->driver_data = priv;
>
> if (cur_cluster < MAX_CLUSTERS) {
> int cpu;
> @@ -484,12 +496,19 @@ static int bL_cpufreq_init(struct cpufreq_policy *policy)
>
> dev_info(cpu_dev, "%s: CPU %d initialized\n", __func__, policy->cpu);
> return 0;
> +
> +out_free_cpufreq_table:
> + put_cluster_clk_and_freq_table(cpu_dev);
> +
> + return ret;
> }
>
> static int bL_cpufreq_exit(struct cpufreq_policy *policy)
> {
> struct device *cpu_dev;
> + struct private_data *priv = policy->driver_data;
>
> + cpufreq_cooling_unregister(priv->cdev);
> cpu_dev = get_cpu_device(policy->cpu);
> if (!cpu_dev) {
> pr_err("%s: failed to get cpu%d device\n", __func__,
> @@ -498,11 +517,39 @@ static int bL_cpufreq_exit(struct cpufreq_policy *policy)
> }
>
> put_cluster_clk_and_freq_table(cpu_dev);
> + kfree(priv);
> dev_dbg(cpu_dev, "%s: Exited, cpu: %d\n", __func__, policy->cpu);
>
> return 0;
> }
>
> +static void bL_cpufreq_ready(struct cpufreq_policy *policy)
> +{
> + struct device *cpu_dev = get_cpu_device(policy->cpu);
> + struct device_node *np = of_node_get(cpu_dev->of_node);
> + struct private_data *priv = policy->driver_data;
> +
> + if (WARN_ON(!np))
> + return;
> +
> + if (of_find_property(np, "#cooling-cells", NULL)) {
> + u32 power_coefficient = 0;
> +
> + of_property_read_u32(np, "dynamic-power-coefficient",
> + &power_coefficient);
> +
> + priv->cdev = of_cpufreq_power_cooling_register(np,
> + policy->related_cpus, power_coefficient, NULL);
> + if (IS_ERR(priv->cdev)) {
> + dev_err(cpu_dev,
> + "running cpufreq without cooling device: %ld\n",
> + PTR_ERR(priv->cdev));
> + priv->cdev = NULL;
> + }
> + }
> + of_node_put(np);
> +}
> +
> static struct cpufreq_driver bL_cpufreq_driver = {
> .name = "arm-big-little",
> .flags = CPUFREQ_STICKY |
> @@ -513,6 +560,7 @@ static struct cpufreq_driver bL_cpufreq_driver = {
> .get = bL_cpufreq_get_rate,
> .init = bL_cpufreq_init,
> .exit = bL_cpufreq_exit,
> + .ready = bL_cpufreq_ready,
> .attr = cpufreq_generic_attr,
> };
>
> --
> 2.5.3
>
> --
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