cpufreq: scpi: remove arm_big_little dependency
The dependency on physical_package_id from the topology to get the cluster identifier is wrong. The concept of cluster used in ARM topology is unfortunately not well defined in the architecture, we should avoid using it. Further the frequency domain need not be mapped to so called "clusters" one to one. SCPI already provides means to obtain the frequency domain id from the device tree. In order to support some new topologies(e.g. DSU which contains 2 frequency domains within the physical cluster), pseudo clusters are created to make this driver work which is wrong again. In order to solve those issues and also remove dependency of topological physical id for frequency domain, this patch removes the arm_big_little dependency from scpi driver. Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sudeep Holla
Rafael J. Wysocki
Родитель
dff4113d5e
Коммит
343a8d17fa
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@ -18,27 +18,89 @@
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/clk.h>
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#include <linux/cpu.h>
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#include <linux/cpufreq.h>
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#include <linux/cpumask.h>
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#include <linux/cpu_cooling.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/pm_opp.h>
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#include <linux/scpi_protocol.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include "arm_big_little.h"
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struct scpi_data {
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struct clk *clk;
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struct device *cpu_dev;
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struct thermal_cooling_device *cdev;
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};
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static struct scpi_ops *scpi_ops;
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static int scpi_get_transition_latency(struct device *cpu_dev)
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static unsigned int scpi_cpufreq_get_rate(unsigned int cpu)
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{
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return scpi_ops->get_transition_latency(cpu_dev);
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struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
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struct scpi_data *priv = policy->driver_data;
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unsigned long rate = clk_get_rate(priv->clk);
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return rate / 1000;
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}
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static int scpi_init_opp_table(const struct cpumask *cpumask)
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static int
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scpi_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index)
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{
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struct scpi_data *priv = policy->driver_data;
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u64 rate = policy->freq_table[index].frequency * 1000;
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int ret;
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ret = clk_set_rate(priv->clk, rate);
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if (!ret && (clk_get_rate(priv->clk) != rate))
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ret = -EIO;
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return ret;
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}
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static int
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scpi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
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{
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int cpu, domain, tdomain;
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struct device *tcpu_dev;
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domain = scpi_ops->device_domain_id(cpu_dev);
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if (domain < 0)
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return domain;
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for_each_possible_cpu(cpu) {
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if (cpu == cpu_dev->id)
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continue;
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tcpu_dev = get_cpu_device(cpu);
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if (!tcpu_dev)
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continue;
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tdomain = scpi_ops->device_domain_id(tcpu_dev);
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if (tdomain == domain)
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cpumask_set_cpu(cpu, cpumask);
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}
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return 0;
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}
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static int scpi_cpufreq_init(struct cpufreq_policy *policy)
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{
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int ret;
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struct device *cpu_dev = get_cpu_device(cpumask_first(cpumask));
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unsigned int latency;
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struct device *cpu_dev;
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struct scpi_data *priv;
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struct cpufreq_frequency_table *freq_table;
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cpu_dev = get_cpu_device(policy->cpu);
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if (!cpu_dev) {
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pr_err("failed to get cpu%d device\n", policy->cpu);
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return -ENODEV;
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}
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ret = scpi_ops->add_opps_to_device(cpu_dev);
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if (ret) {
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@ -46,32 +108,133 @@ static int scpi_init_opp_table(const struct cpumask *cpumask)
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return ret;
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}
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ret = dev_pm_opp_set_sharing_cpus(cpu_dev, cpumask);
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if (ret)
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ret = scpi_get_sharing_cpus(cpu_dev, policy->cpus);
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if (ret) {
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dev_warn(cpu_dev, "failed to get sharing cpumask\n");
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return ret;
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}
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ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
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if (ret) {
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dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
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__func__, ret);
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return ret;
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}
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ret = dev_pm_opp_get_opp_count(cpu_dev);
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if (ret <= 0) {
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dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
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ret = -EPROBE_DEFER;
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goto out_free_opp;
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}
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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ret = -ENOMEM;
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goto out_free_opp;
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}
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ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
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if (ret) {
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dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
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goto out_free_priv;
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}
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priv->cpu_dev = cpu_dev;
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priv->clk = clk_get(cpu_dev, NULL);
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if (IS_ERR(priv->clk)) {
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dev_err(cpu_dev, "%s: Failed to get clk for cpu: %d\n",
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__func__, cpu_dev->id);
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goto out_free_cpufreq_table;
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}
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policy->driver_data = priv;
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ret = cpufreq_table_validate_and_show(policy, freq_table);
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if (ret) {
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dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
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ret);
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goto out_put_clk;
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}
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/* scpi allows DVFS request for any domain from any CPU */
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policy->dvfs_possible_from_any_cpu = true;
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latency = scpi_ops->get_transition_latency(cpu_dev);
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if (!latency)
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latency = CPUFREQ_ETERNAL;
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policy->cpuinfo.transition_latency = latency;
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policy->fast_switch_possible = false;
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return 0;
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out_put_clk:
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clk_put(priv->clk);
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out_free_cpufreq_table:
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dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
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out_free_priv:
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kfree(priv);
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out_free_opp:
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dev_pm_opp_cpumask_remove_table(policy->cpus);
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return ret;
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}
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static const struct cpufreq_arm_bL_ops scpi_cpufreq_ops = {
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.name = "scpi",
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.get_transition_latency = scpi_get_transition_latency,
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.init_opp_table = scpi_init_opp_table,
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.free_opp_table = dev_pm_opp_cpumask_remove_table,
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static int scpi_cpufreq_exit(struct cpufreq_policy *policy)
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{
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struct scpi_data *priv = policy->driver_data;
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cpufreq_cooling_unregister(priv->cdev);
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clk_put(priv->clk);
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dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
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kfree(priv);
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dev_pm_opp_cpumask_remove_table(policy->related_cpus);
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return 0;
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}
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static void scpi_cpufreq_ready(struct cpufreq_policy *policy)
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{
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struct scpi_data *priv = policy->driver_data;
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struct thermal_cooling_device *cdev;
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cdev = of_cpufreq_cooling_register(policy);
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if (!IS_ERR(cdev))
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priv->cdev = cdev;
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}
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static struct cpufreq_driver scpi_cpufreq_driver = {
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.name = "scpi-cpufreq",
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.flags = CPUFREQ_STICKY | CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
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CPUFREQ_NEED_INITIAL_FREQ_CHECK,
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.verify = cpufreq_generic_frequency_table_verify,
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.attr = cpufreq_generic_attr,
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.get = scpi_cpufreq_get_rate,
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.init = scpi_cpufreq_init,
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.exit = scpi_cpufreq_exit,
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.ready = scpi_cpufreq_ready,
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.target_index = scpi_cpufreq_set_target,
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};
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static int scpi_cpufreq_probe(struct platform_device *pdev)
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{
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int ret;
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scpi_ops = get_scpi_ops();
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if (!scpi_ops)
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return -EIO;
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return bL_cpufreq_register(&scpi_cpufreq_ops);
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ret = cpufreq_register_driver(&scpi_cpufreq_driver);
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if (ret)
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dev_err(&pdev->dev, "%s: registering cpufreq failed, err: %d\n",
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__func__, ret);
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return ret;
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}
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static int scpi_cpufreq_remove(struct platform_device *pdev)
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{
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bL_cpufreq_unregister(&scpi_cpufreq_ops);
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cpufreq_unregister_driver(&scpi_cpufreq_driver);
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scpi_ops = NULL;
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return 0;
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}
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