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![Sudeep Holla](/assets/img/avatar_default.png)
Currently ACPI populates just the minimum information about the last level cache from PPTT in order to feed the same to build sched_domains. Similar support for DT platforms is not present. In order to enable the same, the entire cache hierarchy information can be built as part of CPU topoplogy parsing both on ACPI and DT platforms. Note that this change builds the cacheinfo early even on ACPI systems, but the current mechanism of building llc_sibling mask remains unchanged. Link: https://lore.kernel.org/r/20220704101605.1318280-10-sudeep.holla@arm.com Tested-by: Ionela Voinescu <ionela.voinescu@arm.com> Tested-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
808 lines
20 KiB
C
808 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Arch specific cpu topology information
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*
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* Copyright (C) 2016, ARM Ltd.
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* Written by: Juri Lelli, ARM Ltd.
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*/
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#include <linux/acpi.h>
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#include <linux/cacheinfo.h>
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#include <linux/cpu.h>
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#include <linux/cpufreq.h>
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#include <linux/device.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/sched/topology.h>
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#include <linux/cpuset.h>
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#include <linux/cpumask.h>
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#include <linux/init.h>
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#include <linux/rcupdate.h>
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#include <linux/sched.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/thermal_pressure.h>
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static DEFINE_PER_CPU(struct scale_freq_data __rcu *, sft_data);
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static struct cpumask scale_freq_counters_mask;
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static bool scale_freq_invariant;
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static DEFINE_PER_CPU(u32, freq_factor) = 1;
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static bool supports_scale_freq_counters(const struct cpumask *cpus)
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{
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return cpumask_subset(cpus, &scale_freq_counters_mask);
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}
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bool topology_scale_freq_invariant(void)
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{
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return cpufreq_supports_freq_invariance() ||
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supports_scale_freq_counters(cpu_online_mask);
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}
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static void update_scale_freq_invariant(bool status)
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{
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if (scale_freq_invariant == status)
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return;
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/*
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* Task scheduler behavior depends on frequency invariance support,
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* either cpufreq or counter driven. If the support status changes as
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* a result of counter initialisation and use, retrigger the build of
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* scheduling domains to ensure the information is propagated properly.
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*/
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if (topology_scale_freq_invariant() == status) {
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scale_freq_invariant = status;
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rebuild_sched_domains_energy();
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}
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}
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void topology_set_scale_freq_source(struct scale_freq_data *data,
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const struct cpumask *cpus)
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{
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struct scale_freq_data *sfd;
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int cpu;
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/*
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* Avoid calling rebuild_sched_domains() unnecessarily if FIE is
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* supported by cpufreq.
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*/
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if (cpumask_empty(&scale_freq_counters_mask))
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scale_freq_invariant = topology_scale_freq_invariant();
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rcu_read_lock();
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for_each_cpu(cpu, cpus) {
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sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
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/* Use ARCH provided counters whenever possible */
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if (!sfd || sfd->source != SCALE_FREQ_SOURCE_ARCH) {
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rcu_assign_pointer(per_cpu(sft_data, cpu), data);
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cpumask_set_cpu(cpu, &scale_freq_counters_mask);
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}
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}
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rcu_read_unlock();
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update_scale_freq_invariant(true);
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}
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EXPORT_SYMBOL_GPL(topology_set_scale_freq_source);
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void topology_clear_scale_freq_source(enum scale_freq_source source,
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const struct cpumask *cpus)
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{
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struct scale_freq_data *sfd;
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int cpu;
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rcu_read_lock();
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for_each_cpu(cpu, cpus) {
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sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
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if (sfd && sfd->source == source) {
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rcu_assign_pointer(per_cpu(sft_data, cpu), NULL);
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cpumask_clear_cpu(cpu, &scale_freq_counters_mask);
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}
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}
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rcu_read_unlock();
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/*
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* Make sure all references to previous sft_data are dropped to avoid
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* use-after-free races.
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*/
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synchronize_rcu();
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update_scale_freq_invariant(false);
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}
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EXPORT_SYMBOL_GPL(topology_clear_scale_freq_source);
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void topology_scale_freq_tick(void)
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{
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struct scale_freq_data *sfd = rcu_dereference_sched(*this_cpu_ptr(&sft_data));
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if (sfd)
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sfd->set_freq_scale();
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}
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DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE;
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EXPORT_PER_CPU_SYMBOL_GPL(arch_freq_scale);
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void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
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unsigned long max_freq)
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{
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unsigned long scale;
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int i;
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if (WARN_ON_ONCE(!cur_freq || !max_freq))
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return;
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/*
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* If the use of counters for FIE is enabled, just return as we don't
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* want to update the scale factor with information from CPUFREQ.
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* Instead the scale factor will be updated from arch_scale_freq_tick.
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*/
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if (supports_scale_freq_counters(cpus))
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return;
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scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq;
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for_each_cpu(i, cpus)
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per_cpu(arch_freq_scale, i) = scale;
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}
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DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
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EXPORT_PER_CPU_SYMBOL_GPL(cpu_scale);
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void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)
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{
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per_cpu(cpu_scale, cpu) = capacity;
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}
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DEFINE_PER_CPU(unsigned long, thermal_pressure);
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/**
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* topology_update_thermal_pressure() - Update thermal pressure for CPUs
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* @cpus : The related CPUs for which capacity has been reduced
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* @capped_freq : The maximum allowed frequency that CPUs can run at
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*
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* Update the value of thermal pressure for all @cpus in the mask. The
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* cpumask should include all (online+offline) affected CPUs, to avoid
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* operating on stale data when hot-plug is used for some CPUs. The
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* @capped_freq reflects the currently allowed max CPUs frequency due to
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* thermal capping. It might be also a boost frequency value, which is bigger
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* than the internal 'freq_factor' max frequency. In such case the pressure
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* value should simply be removed, since this is an indication that there is
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* no thermal throttling. The @capped_freq must be provided in kHz.
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*/
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void topology_update_thermal_pressure(const struct cpumask *cpus,
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unsigned long capped_freq)
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{
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unsigned long max_capacity, capacity, th_pressure;
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u32 max_freq;
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int cpu;
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cpu = cpumask_first(cpus);
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max_capacity = arch_scale_cpu_capacity(cpu);
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max_freq = per_cpu(freq_factor, cpu);
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/* Convert to MHz scale which is used in 'freq_factor' */
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capped_freq /= 1000;
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/*
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* Handle properly the boost frequencies, which should simply clean
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* the thermal pressure value.
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*/
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if (max_freq <= capped_freq)
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capacity = max_capacity;
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else
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capacity = mult_frac(max_capacity, capped_freq, max_freq);
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th_pressure = max_capacity - capacity;
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trace_thermal_pressure_update(cpu, th_pressure);
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for_each_cpu(cpu, cpus)
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WRITE_ONCE(per_cpu(thermal_pressure, cpu), th_pressure);
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}
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EXPORT_SYMBOL_GPL(topology_update_thermal_pressure);
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static ssize_t cpu_capacity_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct cpu *cpu = container_of(dev, struct cpu, dev);
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return sysfs_emit(buf, "%lu\n", topology_get_cpu_scale(cpu->dev.id));
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}
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static void update_topology_flags_workfn(struct work_struct *work);
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static DECLARE_WORK(update_topology_flags_work, update_topology_flags_workfn);
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static DEVICE_ATTR_RO(cpu_capacity);
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static int register_cpu_capacity_sysctl(void)
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{
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int i;
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struct device *cpu;
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for_each_possible_cpu(i) {
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cpu = get_cpu_device(i);
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if (!cpu) {
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pr_err("%s: too early to get CPU%d device!\n",
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__func__, i);
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continue;
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}
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device_create_file(cpu, &dev_attr_cpu_capacity);
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}
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return 0;
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}
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subsys_initcall(register_cpu_capacity_sysctl);
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static int update_topology;
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int topology_update_cpu_topology(void)
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{
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return update_topology;
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}
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/*
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* Updating the sched_domains can't be done directly from cpufreq callbacks
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* due to locking, so queue the work for later.
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*/
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static void update_topology_flags_workfn(struct work_struct *work)
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{
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update_topology = 1;
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rebuild_sched_domains();
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pr_debug("sched_domain hierarchy rebuilt, flags updated\n");
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update_topology = 0;
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}
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static u32 *raw_capacity;
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static int free_raw_capacity(void)
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{
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kfree(raw_capacity);
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raw_capacity = NULL;
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return 0;
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}
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void topology_normalize_cpu_scale(void)
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{
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u64 capacity;
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u64 capacity_scale;
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int cpu;
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if (!raw_capacity)
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return;
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capacity_scale = 1;
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for_each_possible_cpu(cpu) {
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capacity = raw_capacity[cpu] * per_cpu(freq_factor, cpu);
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capacity_scale = max(capacity, capacity_scale);
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}
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pr_debug("cpu_capacity: capacity_scale=%llu\n", capacity_scale);
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for_each_possible_cpu(cpu) {
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capacity = raw_capacity[cpu] * per_cpu(freq_factor, cpu);
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capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT,
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capacity_scale);
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topology_set_cpu_scale(cpu, capacity);
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pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
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cpu, topology_get_cpu_scale(cpu));
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}
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}
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bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
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{
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struct clk *cpu_clk;
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static bool cap_parsing_failed;
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int ret;
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u32 cpu_capacity;
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if (cap_parsing_failed)
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return false;
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ret = of_property_read_u32(cpu_node, "capacity-dmips-mhz",
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&cpu_capacity);
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if (!ret) {
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if (!raw_capacity) {
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raw_capacity = kcalloc(num_possible_cpus(),
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sizeof(*raw_capacity),
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GFP_KERNEL);
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if (!raw_capacity) {
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cap_parsing_failed = true;
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return false;
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}
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}
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raw_capacity[cpu] = cpu_capacity;
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pr_debug("cpu_capacity: %pOF cpu_capacity=%u (raw)\n",
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cpu_node, raw_capacity[cpu]);
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/*
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* Update freq_factor for calculating early boot cpu capacities.
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* For non-clk CPU DVFS mechanism, there's no way to get the
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* frequency value now, assuming they are running at the same
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* frequency (by keeping the initial freq_factor value).
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*/
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cpu_clk = of_clk_get(cpu_node, 0);
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if (!PTR_ERR_OR_ZERO(cpu_clk)) {
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per_cpu(freq_factor, cpu) =
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clk_get_rate(cpu_clk) / 1000;
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clk_put(cpu_clk);
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}
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} else {
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if (raw_capacity) {
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pr_err("cpu_capacity: missing %pOF raw capacity\n",
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cpu_node);
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pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
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}
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cap_parsing_failed = true;
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free_raw_capacity();
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}
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return !ret;
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}
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#ifdef CONFIG_ACPI_CPPC_LIB
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#include <acpi/cppc_acpi.h>
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void topology_init_cpu_capacity_cppc(void)
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{
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struct cppc_perf_caps perf_caps;
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int cpu;
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if (likely(acpi_disabled || !acpi_cpc_valid()))
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return;
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raw_capacity = kcalloc(num_possible_cpus(), sizeof(*raw_capacity),
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GFP_KERNEL);
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if (!raw_capacity)
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return;
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for_each_possible_cpu(cpu) {
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if (!cppc_get_perf_caps(cpu, &perf_caps) &&
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(perf_caps.highest_perf >= perf_caps.nominal_perf) &&
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(perf_caps.highest_perf >= perf_caps.lowest_perf)) {
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raw_capacity[cpu] = perf_caps.highest_perf;
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pr_debug("cpu_capacity: CPU%d cpu_capacity=%u (raw).\n",
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cpu, raw_capacity[cpu]);
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continue;
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}
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pr_err("cpu_capacity: CPU%d missing/invalid highest performance.\n", cpu);
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pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
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goto exit;
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}
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topology_normalize_cpu_scale();
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schedule_work(&update_topology_flags_work);
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pr_debug("cpu_capacity: cpu_capacity initialization done\n");
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exit:
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free_raw_capacity();
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}
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#endif
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#ifdef CONFIG_CPU_FREQ
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static cpumask_var_t cpus_to_visit;
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static void parsing_done_workfn(struct work_struct *work);
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static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
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static int
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init_cpu_capacity_callback(struct notifier_block *nb,
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unsigned long val,
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void *data)
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{
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struct cpufreq_policy *policy = data;
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int cpu;
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if (!raw_capacity)
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return 0;
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if (val != CPUFREQ_CREATE_POLICY)
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return 0;
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pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
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cpumask_pr_args(policy->related_cpus),
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cpumask_pr_args(cpus_to_visit));
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cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus);
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for_each_cpu(cpu, policy->related_cpus)
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per_cpu(freq_factor, cpu) = policy->cpuinfo.max_freq / 1000;
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if (cpumask_empty(cpus_to_visit)) {
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topology_normalize_cpu_scale();
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schedule_work(&update_topology_flags_work);
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free_raw_capacity();
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pr_debug("cpu_capacity: parsing done\n");
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schedule_work(&parsing_done_work);
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}
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return 0;
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}
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static struct notifier_block init_cpu_capacity_notifier = {
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.notifier_call = init_cpu_capacity_callback,
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};
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static int __init register_cpufreq_notifier(void)
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{
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int ret;
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/*
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* On ACPI-based systems skip registering cpufreq notifier as cpufreq
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* information is not needed for cpu capacity initialization.
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*/
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if (!acpi_disabled || !raw_capacity)
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return -EINVAL;
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if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL))
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return -ENOMEM;
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cpumask_copy(cpus_to_visit, cpu_possible_mask);
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ret = cpufreq_register_notifier(&init_cpu_capacity_notifier,
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CPUFREQ_POLICY_NOTIFIER);
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if (ret)
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free_cpumask_var(cpus_to_visit);
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return ret;
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}
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core_initcall(register_cpufreq_notifier);
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static void parsing_done_workfn(struct work_struct *work)
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{
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cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
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CPUFREQ_POLICY_NOTIFIER);
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free_cpumask_var(cpus_to_visit);
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}
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#else
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core_initcall(free_raw_capacity);
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#endif
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#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
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/*
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* This function returns the logic cpu number of the node.
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* There are basically three kinds of return values:
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* (1) logic cpu number which is > 0.
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* (2) -ENODEV when the device tree(DT) node is valid and found in the DT but
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* there is no possible logical CPU in the kernel to match. This happens
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* when CONFIG_NR_CPUS is configure to be smaller than the number of
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* CPU nodes in DT. We need to just ignore this case.
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* (3) -1 if the node does not exist in the device tree
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*/
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static int __init get_cpu_for_node(struct device_node *node)
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{
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struct device_node *cpu_node;
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int cpu;
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cpu_node = of_parse_phandle(node, "cpu", 0);
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if (!cpu_node)
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return -1;
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cpu = of_cpu_node_to_id(cpu_node);
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if (cpu >= 0)
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topology_parse_cpu_capacity(cpu_node, cpu);
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else
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pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n",
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cpu_node, cpumask_pr_args(cpu_possible_mask));
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of_node_put(cpu_node);
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return cpu;
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}
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static int __init parse_core(struct device_node *core, int package_id,
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int core_id)
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{
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char name[20];
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bool leaf = true;
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int i = 0;
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int cpu;
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struct device_node *t;
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do {
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snprintf(name, sizeof(name), "thread%d", i);
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t = of_get_child_by_name(core, name);
|
|
if (t) {
|
|
leaf = false;
|
|
cpu = get_cpu_for_node(t);
|
|
if (cpu >= 0) {
|
|
cpu_topology[cpu].package_id = package_id;
|
|
cpu_topology[cpu].core_id = core_id;
|
|
cpu_topology[cpu].thread_id = i;
|
|
} else if (cpu != -ENODEV) {
|
|
pr_err("%pOF: Can't get CPU for thread\n", t);
|
|
of_node_put(t);
|
|
return -EINVAL;
|
|
}
|
|
of_node_put(t);
|
|
}
|
|
i++;
|
|
} while (t);
|
|
|
|
cpu = get_cpu_for_node(core);
|
|
if (cpu >= 0) {
|
|
if (!leaf) {
|
|
pr_err("%pOF: Core has both threads and CPU\n",
|
|
core);
|
|
return -EINVAL;
|
|
}
|
|
|
|
cpu_topology[cpu].package_id = package_id;
|
|
cpu_topology[cpu].core_id = core_id;
|
|
} else if (leaf && cpu != -ENODEV) {
|
|
pr_err("%pOF: Can't get CPU for leaf core\n", core);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init parse_cluster(struct device_node *cluster, int depth)
|
|
{
|
|
char name[20];
|
|
bool leaf = true;
|
|
bool has_cores = false;
|
|
struct device_node *c;
|
|
static int package_id __initdata;
|
|
int core_id = 0;
|
|
int i, ret;
|
|
|
|
/*
|
|
* First check for child clusters; we currently ignore any
|
|
* information about the nesting of clusters and present the
|
|
* scheduler with a flat list of them.
|
|
*/
|
|
i = 0;
|
|
do {
|
|
snprintf(name, sizeof(name), "cluster%d", i);
|
|
c = of_get_child_by_name(cluster, name);
|
|
if (c) {
|
|
leaf = false;
|
|
ret = parse_cluster(c, depth + 1);
|
|
of_node_put(c);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
i++;
|
|
} while (c);
|
|
|
|
/* Now check for cores */
|
|
i = 0;
|
|
do {
|
|
snprintf(name, sizeof(name), "core%d", i);
|
|
c = of_get_child_by_name(cluster, name);
|
|
if (c) {
|
|
has_cores = true;
|
|
|
|
if (depth == 0) {
|
|
pr_err("%pOF: cpu-map children should be clusters\n",
|
|
c);
|
|
of_node_put(c);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (leaf) {
|
|
ret = parse_core(c, package_id, core_id++);
|
|
} else {
|
|
pr_err("%pOF: Non-leaf cluster with core %s\n",
|
|
cluster, name);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
of_node_put(c);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
i++;
|
|
} while (c);
|
|
|
|
if (leaf && !has_cores)
|
|
pr_warn("%pOF: empty cluster\n", cluster);
|
|
|
|
if (leaf)
|
|
package_id++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init parse_dt_topology(void)
|
|
{
|
|
struct device_node *cn, *map;
|
|
int ret = 0;
|
|
int cpu;
|
|
|
|
cn = of_find_node_by_path("/cpus");
|
|
if (!cn) {
|
|
pr_err("No CPU information found in DT\n");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* When topology is provided cpu-map is essentially a root
|
|
* cluster with restricted subnodes.
|
|
*/
|
|
map = of_get_child_by_name(cn, "cpu-map");
|
|
if (!map)
|
|
goto out;
|
|
|
|
ret = parse_cluster(map, 0);
|
|
if (ret != 0)
|
|
goto out_map;
|
|
|
|
topology_normalize_cpu_scale();
|
|
|
|
/*
|
|
* Check that all cores are in the topology; the SMP code will
|
|
* only mark cores described in the DT as possible.
|
|
*/
|
|
for_each_possible_cpu(cpu)
|
|
if (cpu_topology[cpu].package_id == -1)
|
|
ret = -EINVAL;
|
|
|
|
out_map:
|
|
of_node_put(map);
|
|
out:
|
|
of_node_put(cn);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* cpu topology table
|
|
*/
|
|
struct cpu_topology cpu_topology[NR_CPUS];
|
|
EXPORT_SYMBOL_GPL(cpu_topology);
|
|
|
|
const struct cpumask *cpu_coregroup_mask(int cpu)
|
|
{
|
|
const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu));
|
|
|
|
/* Find the smaller of NUMA, core or LLC siblings */
|
|
if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) {
|
|
/* not numa in package, lets use the package siblings */
|
|
core_mask = &cpu_topology[cpu].core_sibling;
|
|
}
|
|
if (cpu_topology[cpu].llc_id != -1) {
|
|
if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask))
|
|
core_mask = &cpu_topology[cpu].llc_sibling;
|
|
}
|
|
|
|
/*
|
|
* For systems with no shared cpu-side LLC but with clusters defined,
|
|
* extend core_mask to cluster_siblings. The sched domain builder will
|
|
* then remove MC as redundant with CLS if SCHED_CLUSTER is enabled.
|
|
*/
|
|
if (IS_ENABLED(CONFIG_SCHED_CLUSTER) &&
|
|
cpumask_subset(core_mask, &cpu_topology[cpu].cluster_sibling))
|
|
core_mask = &cpu_topology[cpu].cluster_sibling;
|
|
|
|
return core_mask;
|
|
}
|
|
|
|
const struct cpumask *cpu_clustergroup_mask(int cpu)
|
|
{
|
|
return &cpu_topology[cpu].cluster_sibling;
|
|
}
|
|
|
|
void update_siblings_masks(unsigned int cpuid)
|
|
{
|
|
struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
|
|
int cpu;
|
|
|
|
/* update core and thread sibling masks */
|
|
for_each_online_cpu(cpu) {
|
|
cpu_topo = &cpu_topology[cpu];
|
|
|
|
if (cpu_topo->llc_id != -1 && cpuid_topo->llc_id == cpu_topo->llc_id) {
|
|
cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling);
|
|
cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling);
|
|
}
|
|
|
|
if (cpuid_topo->package_id != cpu_topo->package_id)
|
|
continue;
|
|
|
|
if (cpuid_topo->cluster_id == cpu_topo->cluster_id &&
|
|
cpuid_topo->cluster_id != -1) {
|
|
cpumask_set_cpu(cpu, &cpuid_topo->cluster_sibling);
|
|
cpumask_set_cpu(cpuid, &cpu_topo->cluster_sibling);
|
|
}
|
|
|
|
cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
|
|
cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
|
|
|
|
if (cpuid_topo->core_id != cpu_topo->core_id)
|
|
continue;
|
|
|
|
cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
|
|
cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
|
|
}
|
|
}
|
|
|
|
static void clear_cpu_topology(int cpu)
|
|
{
|
|
struct cpu_topology *cpu_topo = &cpu_topology[cpu];
|
|
|
|
cpumask_clear(&cpu_topo->llc_sibling);
|
|
cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);
|
|
|
|
cpumask_clear(&cpu_topo->cluster_sibling);
|
|
cpumask_set_cpu(cpu, &cpu_topo->cluster_sibling);
|
|
|
|
cpumask_clear(&cpu_topo->core_sibling);
|
|
cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
|
|
cpumask_clear(&cpu_topo->thread_sibling);
|
|
cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
|
|
}
|
|
|
|
void __init reset_cpu_topology(void)
|
|
{
|
|
unsigned int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
struct cpu_topology *cpu_topo = &cpu_topology[cpu];
|
|
|
|
cpu_topo->thread_id = -1;
|
|
cpu_topo->core_id = -1;
|
|
cpu_topo->cluster_id = -1;
|
|
cpu_topo->package_id = -1;
|
|
cpu_topo->llc_id = -1;
|
|
|
|
clear_cpu_topology(cpu);
|
|
}
|
|
}
|
|
|
|
void remove_cpu_topology(unsigned int cpu)
|
|
{
|
|
int sibling;
|
|
|
|
for_each_cpu(sibling, topology_core_cpumask(cpu))
|
|
cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
|
|
for_each_cpu(sibling, topology_sibling_cpumask(cpu))
|
|
cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
|
|
for_each_cpu(sibling, topology_cluster_cpumask(cpu))
|
|
cpumask_clear_cpu(cpu, topology_cluster_cpumask(sibling));
|
|
for_each_cpu(sibling, topology_llc_cpumask(cpu))
|
|
cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
|
|
|
|
clear_cpu_topology(cpu);
|
|
}
|
|
|
|
__weak int __init parse_acpi_topology(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
|
|
void __init init_cpu_topology(void)
|
|
{
|
|
int ret, cpu;
|
|
|
|
reset_cpu_topology();
|
|
ret = parse_acpi_topology();
|
|
if (!ret)
|
|
ret = of_have_populated_dt() && parse_dt_topology();
|
|
|
|
if (ret) {
|
|
/*
|
|
* Discard anything that was parsed if we hit an error so we
|
|
* don't use partial information.
|
|
*/
|
|
reset_cpu_topology();
|
|
return;
|
|
}
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
ret = detect_cache_attributes(cpu);
|
|
if (ret) {
|
|
pr_info("Early cacheinfo failed, ret = %d\n", ret);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif
|