forked from Minki/linux
9924fbb51e
Define topology_init_cpu_capacity_cppc() to use highest performance values from _CPC objects to obtain and set maximum capacity information for each CPU. acpi_cppc_processor_probe() is a good point at which to trigger the initialization of CPU (u-arch) capacity values, as at this point the highest performance values can be obtained from each CPU's _CPC objects. Architectures can therefore use this functionality through arch_init_invariance_cppc(). The performance scale used by CPPC is a unified scale for all CPUs in the system. Therefore, by obtaining the raw highest performance values from the _CPC objects, and normalizing them on the [0, 1024] capacity scale, used by the task scheduler, we obtain the CPU capacity of each CPU. While an ACPI Notify(0x85) could alert about a change in the highest performance value, which should in turn retrigger the CPU capacity computations, this notification is not currently handled by the ACPI processor driver. When supported, a call to arch_init_invariance_cppc() would perform the update. Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com> Acked-by: Sudeep Holla <sudeep.holla@arm.com> Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Yicong Yang <yangyicong@hisilicon.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
781 lines
19 KiB
C
781 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Arch specific cpu topology information
|
|
*
|
|
* Copyright (C) 2016, ARM Ltd.
|
|
* Written by: Juri Lelli, ARM Ltd.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/device.h>
|
|
#include <linux/of.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sched/topology.h>
|
|
#include <linux/cpuset.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/init.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/sched.h>
|
|
|
|
static DEFINE_PER_CPU(struct scale_freq_data __rcu *, sft_data);
|
|
static struct cpumask scale_freq_counters_mask;
|
|
static bool scale_freq_invariant;
|
|
static DEFINE_PER_CPU(u32, freq_factor) = 1;
|
|
|
|
static bool supports_scale_freq_counters(const struct cpumask *cpus)
|
|
{
|
|
return cpumask_subset(cpus, &scale_freq_counters_mask);
|
|
}
|
|
|
|
bool topology_scale_freq_invariant(void)
|
|
{
|
|
return cpufreq_supports_freq_invariance() ||
|
|
supports_scale_freq_counters(cpu_online_mask);
|
|
}
|
|
|
|
static void update_scale_freq_invariant(bool status)
|
|
{
|
|
if (scale_freq_invariant == status)
|
|
return;
|
|
|
|
/*
|
|
* Task scheduler behavior depends on frequency invariance support,
|
|
* either cpufreq or counter driven. If the support status changes as
|
|
* a result of counter initialisation and use, retrigger the build of
|
|
* scheduling domains to ensure the information is propagated properly.
|
|
*/
|
|
if (topology_scale_freq_invariant() == status) {
|
|
scale_freq_invariant = status;
|
|
rebuild_sched_domains_energy();
|
|
}
|
|
}
|
|
|
|
void topology_set_scale_freq_source(struct scale_freq_data *data,
|
|
const struct cpumask *cpus)
|
|
{
|
|
struct scale_freq_data *sfd;
|
|
int cpu;
|
|
|
|
/*
|
|
* Avoid calling rebuild_sched_domains() unnecessarily if FIE is
|
|
* supported by cpufreq.
|
|
*/
|
|
if (cpumask_empty(&scale_freq_counters_mask))
|
|
scale_freq_invariant = topology_scale_freq_invariant();
|
|
|
|
rcu_read_lock();
|
|
|
|
for_each_cpu(cpu, cpus) {
|
|
sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
|
|
|
|
/* Use ARCH provided counters whenever possible */
|
|
if (!sfd || sfd->source != SCALE_FREQ_SOURCE_ARCH) {
|
|
rcu_assign_pointer(per_cpu(sft_data, cpu), data);
|
|
cpumask_set_cpu(cpu, &scale_freq_counters_mask);
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
update_scale_freq_invariant(true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(topology_set_scale_freq_source);
|
|
|
|
void topology_clear_scale_freq_source(enum scale_freq_source source,
|
|
const struct cpumask *cpus)
|
|
{
|
|
struct scale_freq_data *sfd;
|
|
int cpu;
|
|
|
|
rcu_read_lock();
|
|
|
|
for_each_cpu(cpu, cpus) {
|
|
sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
|
|
|
|
if (sfd && sfd->source == source) {
|
|
rcu_assign_pointer(per_cpu(sft_data, cpu), NULL);
|
|
cpumask_clear_cpu(cpu, &scale_freq_counters_mask);
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
/*
|
|
* Make sure all references to previous sft_data are dropped to avoid
|
|
* use-after-free races.
|
|
*/
|
|
synchronize_rcu();
|
|
|
|
update_scale_freq_invariant(false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(topology_clear_scale_freq_source);
|
|
|
|
void topology_scale_freq_tick(void)
|
|
{
|
|
struct scale_freq_data *sfd = rcu_dereference_sched(*this_cpu_ptr(&sft_data));
|
|
|
|
if (sfd)
|
|
sfd->set_freq_scale();
|
|
}
|
|
|
|
DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE;
|
|
EXPORT_PER_CPU_SYMBOL_GPL(arch_freq_scale);
|
|
|
|
void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
|
|
unsigned long max_freq)
|
|
{
|
|
unsigned long scale;
|
|
int i;
|
|
|
|
if (WARN_ON_ONCE(!cur_freq || !max_freq))
|
|
return;
|
|
|
|
/*
|
|
* If the use of counters for FIE is enabled, just return as we don't
|
|
* want to update the scale factor with information from CPUFREQ.
|
|
* Instead the scale factor will be updated from arch_scale_freq_tick.
|
|
*/
|
|
if (supports_scale_freq_counters(cpus))
|
|
return;
|
|
|
|
scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq;
|
|
|
|
for_each_cpu(i, cpus)
|
|
per_cpu(arch_freq_scale, i) = scale;
|
|
}
|
|
|
|
DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
|
|
EXPORT_PER_CPU_SYMBOL_GPL(cpu_scale);
|
|
|
|
void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)
|
|
{
|
|
per_cpu(cpu_scale, cpu) = capacity;
|
|
}
|
|
|
|
DEFINE_PER_CPU(unsigned long, thermal_pressure);
|
|
|
|
/**
|
|
* topology_update_thermal_pressure() - Update thermal pressure for CPUs
|
|
* @cpus : The related CPUs for which capacity has been reduced
|
|
* @capped_freq : The maximum allowed frequency that CPUs can run at
|
|
*
|
|
* Update the value of thermal pressure for all @cpus in the mask. The
|
|
* cpumask should include all (online+offline) affected CPUs, to avoid
|
|
* operating on stale data when hot-plug is used for some CPUs. The
|
|
* @capped_freq reflects the currently allowed max CPUs frequency due to
|
|
* thermal capping. It might be also a boost frequency value, which is bigger
|
|
* than the internal 'freq_factor' max frequency. In such case the pressure
|
|
* value should simply be removed, since this is an indication that there is
|
|
* no thermal throttling. The @capped_freq must be provided in kHz.
|
|
*/
|
|
void topology_update_thermal_pressure(const struct cpumask *cpus,
|
|
unsigned long capped_freq)
|
|
{
|
|
unsigned long max_capacity, capacity, th_pressure;
|
|
u32 max_freq;
|
|
int cpu;
|
|
|
|
cpu = cpumask_first(cpus);
|
|
max_capacity = arch_scale_cpu_capacity(cpu);
|
|
max_freq = per_cpu(freq_factor, cpu);
|
|
|
|
/* Convert to MHz scale which is used in 'freq_factor' */
|
|
capped_freq /= 1000;
|
|
|
|
/*
|
|
* Handle properly the boost frequencies, which should simply clean
|
|
* the thermal pressure value.
|
|
*/
|
|
if (max_freq <= capped_freq)
|
|
capacity = max_capacity;
|
|
else
|
|
capacity = mult_frac(max_capacity, capped_freq, max_freq);
|
|
|
|
th_pressure = max_capacity - capacity;
|
|
|
|
for_each_cpu(cpu, cpus)
|
|
WRITE_ONCE(per_cpu(thermal_pressure, cpu), th_pressure);
|
|
}
|
|
EXPORT_SYMBOL_GPL(topology_update_thermal_pressure);
|
|
|
|
static ssize_t cpu_capacity_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, dev);
|
|
|
|
return sysfs_emit(buf, "%lu\n", topology_get_cpu_scale(cpu->dev.id));
|
|
}
|
|
|
|
static void update_topology_flags_workfn(struct work_struct *work);
|
|
static DECLARE_WORK(update_topology_flags_work, update_topology_flags_workfn);
|
|
|
|
static DEVICE_ATTR_RO(cpu_capacity);
|
|
|
|
static int register_cpu_capacity_sysctl(void)
|
|
{
|
|
int i;
|
|
struct device *cpu;
|
|
|
|
for_each_possible_cpu(i) {
|
|
cpu = get_cpu_device(i);
|
|
if (!cpu) {
|
|
pr_err("%s: too early to get CPU%d device!\n",
|
|
__func__, i);
|
|
continue;
|
|
}
|
|
device_create_file(cpu, &dev_attr_cpu_capacity);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(register_cpu_capacity_sysctl);
|
|
|
|
static int update_topology;
|
|
|
|
int topology_update_cpu_topology(void)
|
|
{
|
|
return update_topology;
|
|
}
|
|
|
|
/*
|
|
* Updating the sched_domains can't be done directly from cpufreq callbacks
|
|
* due to locking, so queue the work for later.
|
|
*/
|
|
static void update_topology_flags_workfn(struct work_struct *work)
|
|
{
|
|
update_topology = 1;
|
|
rebuild_sched_domains();
|
|
pr_debug("sched_domain hierarchy rebuilt, flags updated\n");
|
|
update_topology = 0;
|
|
}
|
|
|
|
static u32 *raw_capacity;
|
|
|
|
static int free_raw_capacity(void)
|
|
{
|
|
kfree(raw_capacity);
|
|
raw_capacity = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void topology_normalize_cpu_scale(void)
|
|
{
|
|
u64 capacity;
|
|
u64 capacity_scale;
|
|
int cpu;
|
|
|
|
if (!raw_capacity)
|
|
return;
|
|
|
|
capacity_scale = 1;
|
|
for_each_possible_cpu(cpu) {
|
|
capacity = raw_capacity[cpu] * per_cpu(freq_factor, cpu);
|
|
capacity_scale = max(capacity, capacity_scale);
|
|
}
|
|
|
|
pr_debug("cpu_capacity: capacity_scale=%llu\n", capacity_scale);
|
|
for_each_possible_cpu(cpu) {
|
|
capacity = raw_capacity[cpu] * per_cpu(freq_factor, cpu);
|
|
capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT,
|
|
capacity_scale);
|
|
topology_set_cpu_scale(cpu, capacity);
|
|
pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
|
|
cpu, topology_get_cpu_scale(cpu));
|
|
}
|
|
}
|
|
|
|
bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
|
|
{
|
|
struct clk *cpu_clk;
|
|
static bool cap_parsing_failed;
|
|
int ret;
|
|
u32 cpu_capacity;
|
|
|
|
if (cap_parsing_failed)
|
|
return false;
|
|
|
|
ret = of_property_read_u32(cpu_node, "capacity-dmips-mhz",
|
|
&cpu_capacity);
|
|
if (!ret) {
|
|
if (!raw_capacity) {
|
|
raw_capacity = kcalloc(num_possible_cpus(),
|
|
sizeof(*raw_capacity),
|
|
GFP_KERNEL);
|
|
if (!raw_capacity) {
|
|
cap_parsing_failed = true;
|
|
return false;
|
|
}
|
|
}
|
|
raw_capacity[cpu] = cpu_capacity;
|
|
pr_debug("cpu_capacity: %pOF cpu_capacity=%u (raw)\n",
|
|
cpu_node, raw_capacity[cpu]);
|
|
|
|
/*
|
|
* Update freq_factor for calculating early boot cpu capacities.
|
|
* For non-clk CPU DVFS mechanism, there's no way to get the
|
|
* frequency value now, assuming they are running at the same
|
|
* frequency (by keeping the initial freq_factor value).
|
|
*/
|
|
cpu_clk = of_clk_get(cpu_node, 0);
|
|
if (!PTR_ERR_OR_ZERO(cpu_clk)) {
|
|
per_cpu(freq_factor, cpu) =
|
|
clk_get_rate(cpu_clk) / 1000;
|
|
clk_put(cpu_clk);
|
|
}
|
|
} else {
|
|
if (raw_capacity) {
|
|
pr_err("cpu_capacity: missing %pOF raw capacity\n",
|
|
cpu_node);
|
|
pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
|
|
}
|
|
cap_parsing_failed = true;
|
|
free_raw_capacity();
|
|
}
|
|
|
|
return !ret;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI_CPPC_LIB
|
|
#include <acpi/cppc_acpi.h>
|
|
|
|
void topology_init_cpu_capacity_cppc(void)
|
|
{
|
|
struct cppc_perf_caps perf_caps;
|
|
int cpu;
|
|
|
|
if (likely(acpi_disabled || !acpi_cpc_valid()))
|
|
return;
|
|
|
|
raw_capacity = kcalloc(num_possible_cpus(), sizeof(*raw_capacity),
|
|
GFP_KERNEL);
|
|
if (!raw_capacity)
|
|
return;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
if (!cppc_get_perf_caps(cpu, &perf_caps) &&
|
|
(perf_caps.highest_perf >= perf_caps.nominal_perf) &&
|
|
(perf_caps.highest_perf >= perf_caps.lowest_perf)) {
|
|
raw_capacity[cpu] = perf_caps.highest_perf;
|
|
pr_debug("cpu_capacity: CPU%d cpu_capacity=%u (raw).\n",
|
|
cpu, raw_capacity[cpu]);
|
|
continue;
|
|
}
|
|
|
|
pr_err("cpu_capacity: CPU%d missing/invalid highest performance.\n", cpu);
|
|
pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
|
|
goto exit;
|
|
}
|
|
|
|
topology_normalize_cpu_scale();
|
|
schedule_work(&update_topology_flags_work);
|
|
pr_debug("cpu_capacity: cpu_capacity initialization done\n");
|
|
|
|
exit:
|
|
free_raw_capacity();
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_CPU_FREQ
|
|
static cpumask_var_t cpus_to_visit;
|
|
static void parsing_done_workfn(struct work_struct *work);
|
|
static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
|
|
|
|
static int
|
|
init_cpu_capacity_callback(struct notifier_block *nb,
|
|
unsigned long val,
|
|
void *data)
|
|
{
|
|
struct cpufreq_policy *policy = data;
|
|
int cpu;
|
|
|
|
if (!raw_capacity)
|
|
return 0;
|
|
|
|
if (val != CPUFREQ_CREATE_POLICY)
|
|
return 0;
|
|
|
|
pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
|
|
cpumask_pr_args(policy->related_cpus),
|
|
cpumask_pr_args(cpus_to_visit));
|
|
|
|
cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus);
|
|
|
|
for_each_cpu(cpu, policy->related_cpus)
|
|
per_cpu(freq_factor, cpu) = policy->cpuinfo.max_freq / 1000;
|
|
|
|
if (cpumask_empty(cpus_to_visit)) {
|
|
topology_normalize_cpu_scale();
|
|
schedule_work(&update_topology_flags_work);
|
|
free_raw_capacity();
|
|
pr_debug("cpu_capacity: parsing done\n");
|
|
schedule_work(&parsing_done_work);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block init_cpu_capacity_notifier = {
|
|
.notifier_call = init_cpu_capacity_callback,
|
|
};
|
|
|
|
static int __init register_cpufreq_notifier(void)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* On ACPI-based systems skip registering cpufreq notifier as cpufreq
|
|
* information is not needed for cpu capacity initialization.
|
|
*/
|
|
if (!acpi_disabled || !raw_capacity)
|
|
return -EINVAL;
|
|
|
|
if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
|
|
cpumask_copy(cpus_to_visit, cpu_possible_mask);
|
|
|
|
ret = cpufreq_register_notifier(&init_cpu_capacity_notifier,
|
|
CPUFREQ_POLICY_NOTIFIER);
|
|
|
|
if (ret)
|
|
free_cpumask_var(cpus_to_visit);
|
|
|
|
return ret;
|
|
}
|
|
core_initcall(register_cpufreq_notifier);
|
|
|
|
static void parsing_done_workfn(struct work_struct *work)
|
|
{
|
|
cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
|
|
CPUFREQ_POLICY_NOTIFIER);
|
|
free_cpumask_var(cpus_to_visit);
|
|
}
|
|
|
|
#else
|
|
core_initcall(free_raw_capacity);
|
|
#endif
|
|
|
|
#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
|
|
/*
|
|
* This function returns the logic cpu number of the node.
|
|
* There are basically three kinds of return values:
|
|
* (1) logic cpu number which is > 0.
|
|
* (2) -ENODEV when the device tree(DT) node is valid and found in the DT but
|
|
* there is no possible logical CPU in the kernel to match. This happens
|
|
* when CONFIG_NR_CPUS is configure to be smaller than the number of
|
|
* CPU nodes in DT. We need to just ignore this case.
|
|
* (3) -1 if the node does not exist in the device tree
|
|
*/
|
|
static int __init get_cpu_for_node(struct device_node *node)
|
|
{
|
|
struct device_node *cpu_node;
|
|
int cpu;
|
|
|
|
cpu_node = of_parse_phandle(node, "cpu", 0);
|
|
if (!cpu_node)
|
|
return -1;
|
|
|
|
cpu = of_cpu_node_to_id(cpu_node);
|
|
if (cpu >= 0)
|
|
topology_parse_cpu_capacity(cpu_node, cpu);
|
|
else
|
|
pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n",
|
|
cpu_node, cpumask_pr_args(cpu_possible_mask));
|
|
|
|
of_node_put(cpu_node);
|
|
return cpu;
|
|
}
|
|
|
|
static int __init parse_core(struct device_node *core, int package_id,
|
|
int core_id)
|
|
{
|
|
char name[20];
|
|
bool leaf = true;
|
|
int i = 0;
|
|
int cpu;
|
|
struct device_node *t;
|
|
|
|
do {
|
|
snprintf(name, sizeof(name), "thread%d", i);
|
|
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;
|
|
}
|
|
|
|
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 (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)
|
|
{
|
|
reset_cpu_topology();
|
|
|
|
/*
|
|
* Discard anything that was parsed if we hit an error so we
|
|
* don't use partial information.
|
|
*/
|
|
if (parse_acpi_topology())
|
|
reset_cpu_topology();
|
|
else if (of_have_populated_dt() && parse_dt_topology())
|
|
reset_cpu_topology();
|
|
}
|
|
#endif
|