mirror of https://gitee.com/openkylin/linux.git
arm, arm64: factorize common cpu capacity default code
arm and arm64 share lot of code relative to parsing CPU capacity information from DT, using that information for appropriate scaling and exposing a sysfs interface for chaging such values at runtime. Factorize such code in a common place (driver/base/arch_topology.c) in preparation for further additions. Suggested-by: Will Deacon <will.deacon@arm.com> Suggested-by: Mark Rutland <mark.rutland@arm.com> Suggested-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Juri Lelli <juri.lelli@arm.com> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Juri Lelli
Greg Kroah-Hartman
parent
f70b281b59
commit
2ef7a2953c
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@ -25,6 +25,7 @@ config ARM
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select EDAC_SUPPORT
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select EDAC_SUPPORT
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select EDAC_ATOMIC_SCRUB
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select EDAC_ATOMIC_SCRUB
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select GENERIC_ALLOCATOR
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select GENERIC_ALLOCATOR
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select GENERIC_ARCH_TOPOLOGY if ARM_CPU_TOPOLOGY
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select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
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select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
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select GENERIC_CLOCKEVENTS_BROADCAST if SMP
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select GENERIC_CLOCKEVENTS_BROADCAST if SMP
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select GENERIC_CPU_AUTOPROBE
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select GENERIC_CPU_AUTOPROBE
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@ -44,75 +44,10 @@
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* to run the rebalance_domains for all idle cores and the cpu_capacity can be
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* to run the rebalance_domains for all idle cores and the cpu_capacity can be
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* updated during this sequence.
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* updated during this sequence.
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*/
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*/
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static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
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static DEFINE_MUTEX(cpu_scale_mutex);
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unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
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extern unsigned long
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{
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arch_scale_cpu_capacity(struct sched_domain *sd, int cpu);
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return per_cpu(cpu_scale, cpu);
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extern void set_capacity_scale(unsigned int cpu, unsigned long capacity);
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}
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static void set_capacity_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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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 sprintf(buf, "%lu\n",
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arch_scale_cpu_capacity(NULL, cpu->dev.id));
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}
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static ssize_t cpu_capacity_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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struct cpu *cpu = container_of(dev, struct cpu, dev);
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int this_cpu = cpu->dev.id, i;
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unsigned long new_capacity;
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ssize_t ret;
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if (count) {
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ret = kstrtoul(buf, 0, &new_capacity);
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if (ret)
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return ret;
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if (new_capacity > SCHED_CAPACITY_SCALE)
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return -EINVAL;
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mutex_lock(&cpu_scale_mutex);
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for_each_cpu(i, &cpu_topology[this_cpu].core_sibling)
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set_capacity_scale(i, new_capacity);
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mutex_unlock(&cpu_scale_mutex);
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}
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return count;
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}
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static DEVICE_ATTR_RW(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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#ifdef CONFIG_OF
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#ifdef CONFIG_OF
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struct cpu_efficiency {
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struct cpu_efficiency {
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@ -141,145 +76,9 @@ static unsigned long *__cpu_capacity;
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static unsigned long middle_capacity = 1;
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static unsigned long middle_capacity = 1;
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static bool cap_from_dt = true;
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static bool cap_from_dt = true;
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static u32 *raw_capacity;
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extern bool cap_parsing_failed;
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static bool cap_parsing_failed;
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extern void normalize_cpu_capacity(void);
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static u32 capacity_scale;
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extern int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu);
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static int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu)
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{
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int ret = 1;
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u32 cpu_capacity;
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if (cap_parsing_failed)
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return !ret;
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ret = of_property_read_u32(cpu_node,
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"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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pr_err("cpu_capacity: failed to allocate memory for raw capacities\n");
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cap_parsing_failed = true;
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return 0;
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}
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}
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capacity_scale = max(cpu_capacity, capacity_scale);
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raw_capacity[cpu] = cpu_capacity;
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pr_debug("cpu_capacity: %s cpu_capacity=%u (raw)\n",
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cpu_node->full_name, raw_capacity[cpu]);
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} else {
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if (raw_capacity) {
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pr_err("cpu_capacity: missing %s raw capacity\n",
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cpu_node->full_name);
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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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kfree(raw_capacity);
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}
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return !ret;
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}
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static void normalize_cpu_capacity(void)
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{
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u64 capacity;
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int cpu;
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if (!raw_capacity || cap_parsing_failed)
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return;
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pr_debug("cpu_capacity: capacity_scale=%u\n", capacity_scale);
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mutex_lock(&cpu_scale_mutex);
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for_each_possible_cpu(cpu) {
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capacity = (raw_capacity[cpu] << SCHED_CAPACITY_SHIFT)
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/ capacity_scale;
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set_capacity_scale(cpu, capacity);
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pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
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cpu, arch_scale_cpu_capacity(NULL, cpu));
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}
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mutex_unlock(&cpu_scale_mutex);
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}
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#ifdef CONFIG_CPU_FREQ
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static cpumask_var_t cpus_to_visit;
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static bool cap_parsing_done;
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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 (cap_parsing_failed || cap_parsing_done)
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return 0;
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switch (val) {
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case CPUFREQ_NOTIFY:
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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,
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cpus_to_visit,
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policy->related_cpus);
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for_each_cpu(cpu, policy->related_cpus) {
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raw_capacity[cpu] = arch_scale_cpu_capacity(NULL, cpu) *
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policy->cpuinfo.max_freq / 1000UL;
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capacity_scale = max(raw_capacity[cpu], capacity_scale);
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}
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if (cpumask_empty(cpus_to_visit)) {
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normalize_cpu_capacity();
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kfree(raw_capacity);
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pr_debug("cpu_capacity: parsing done\n");
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cap_parsing_done = true;
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schedule_work(&parsing_done_work);
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}
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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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if (cap_parsing_failed)
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return -EINVAL;
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if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) {
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pr_err("cpu_capacity: failed to allocate memory for cpus_to_visit\n");
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return -ENOMEM;
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}
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cpumask_copy(cpus_to_visit, cpu_possible_mask);
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return cpufreq_register_notifier(&init_cpu_capacity_notifier,
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CPUFREQ_POLICY_NOTIFIER);
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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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}
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#else
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static int __init free_raw_capacity(void)
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{
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kfree(raw_capacity);
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return 0;
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}
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core_initcall(free_raw_capacity);
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#endif
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/*
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/*
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* Iterate all CPUs' descriptor in DT and compute the efficiency
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* Iterate all CPUs' descriptor in DT and compute the efficiency
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@ -41,6 +41,7 @@ config ARM64
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select EDAC_SUPPORT
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select EDAC_SUPPORT
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select FRAME_POINTER
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select FRAME_POINTER
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select GENERIC_ALLOCATOR
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select GENERIC_ALLOCATOR
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select GENERIC_ARCH_TOPOLOGY
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select GENERIC_CLOCKEVENTS
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select GENERIC_CLOCKEVENTS
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select GENERIC_CLOCKEVENTS_BROADCAST
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select GENERIC_CLOCKEVENTS_BROADCAST
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select GENERIC_CPU_AUTOPROBE
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select GENERIC_CPU_AUTOPROBE
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@ -11,7 +11,6 @@
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* for more details.
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* for more details.
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*/
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*/
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#include <linux/acpi.h>
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#include <linux/cpu.h>
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#include <linux/cpu.h>
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#include <linux/cpumask.h>
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#include <linux/cpumask.h>
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#include <linux/init.h>
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#include <linux/init.h>
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@ -23,226 +22,14 @@
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#include <linux/sched/topology.h>
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#include <linux/sched/topology.h>
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#include <linux/slab.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/cpufreq.h>
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#include <asm/cpu.h>
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#include <asm/cpu.h>
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#include <asm/cputype.h>
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#include <asm/cputype.h>
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#include <asm/topology.h>
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#include <asm/topology.h>
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static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
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extern bool cap_parsing_failed;
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static DEFINE_MUTEX(cpu_scale_mutex);
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extern void normalize_cpu_capacity(void);
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extern int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu);
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unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
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{
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return per_cpu(cpu_scale, cpu);
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}
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static void set_capacity_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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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 sprintf(buf, "%lu\n",
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arch_scale_cpu_capacity(NULL, cpu->dev.id));
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}
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static ssize_t cpu_capacity_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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struct cpu *cpu = container_of(dev, struct cpu, dev);
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int this_cpu = cpu->dev.id, i;
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unsigned long new_capacity;
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ssize_t ret;
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if (count) {
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ret = kstrtoul(buf, 0, &new_capacity);
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if (ret)
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return ret;
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if (new_capacity > SCHED_CAPACITY_SCALE)
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return -EINVAL;
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mutex_lock(&cpu_scale_mutex);
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for_each_cpu(i, &cpu_topology[this_cpu].core_sibling)
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set_capacity_scale(i, new_capacity);
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mutex_unlock(&cpu_scale_mutex);
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}
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return count;
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}
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static DEVICE_ATTR_RW(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 u32 capacity_scale;
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static u32 *raw_capacity;
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static bool cap_parsing_failed;
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static void __init parse_cpu_capacity(struct device_node *cpu_node, int cpu)
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{
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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;
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ret = of_property_read_u32(cpu_node,
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"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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pr_err("cpu_capacity: failed to allocate memory for raw capacities\n");
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cap_parsing_failed = true;
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return;
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}
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}
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capacity_scale = max(cpu_capacity, capacity_scale);
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raw_capacity[cpu] = cpu_capacity;
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pr_debug("cpu_capacity: %s cpu_capacity=%u (raw)\n",
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cpu_node->full_name, raw_capacity[cpu]);
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} else {
|
|
||||||
if (raw_capacity) {
|
|
||||||
pr_err("cpu_capacity: missing %s raw capacity\n",
|
|
||||||
cpu_node->full_name);
|
|
||||||
pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
|
|
||||||
}
|
|
||||||
cap_parsing_failed = true;
|
|
||||||
kfree(raw_capacity);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static void normalize_cpu_capacity(void)
|
|
||||||
{
|
|
||||||
u64 capacity;
|
|
||||||
int cpu;
|
|
||||||
|
|
||||||
if (!raw_capacity || cap_parsing_failed)
|
|
||||||
return;
|
|
||||||
|
|
||||||
pr_debug("cpu_capacity: capacity_scale=%u\n", capacity_scale);
|
|
||||||
mutex_lock(&cpu_scale_mutex);
|
|
||||||
for_each_possible_cpu(cpu) {
|
|
||||||
pr_debug("cpu_capacity: cpu=%d raw_capacity=%u\n",
|
|
||||||
cpu, raw_capacity[cpu]);
|
|
||||||
capacity = (raw_capacity[cpu] << SCHED_CAPACITY_SHIFT)
|
|
||||||
/ capacity_scale;
|
|
||||||
set_capacity_scale(cpu, capacity);
|
|
||||||
pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
|
|
||||||
cpu, arch_scale_cpu_capacity(NULL, cpu));
|
|
||||||
}
|
|
||||||
mutex_unlock(&cpu_scale_mutex);
|
|
||||||
}
|
|
||||||
|
|
||||||
#ifdef CONFIG_CPU_FREQ
|
|
||||||
static cpumask_var_t cpus_to_visit;
|
|
||||||
static bool cap_parsing_done;
|
|
||||||
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 (cap_parsing_failed || cap_parsing_done)
|
|
||||||
return 0;
|
|
||||||
|
|
||||||
switch (val) {
|
|
||||||
case CPUFREQ_NOTIFY:
|
|
||||||
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) {
|
|
||||||
raw_capacity[cpu] = arch_scale_cpu_capacity(NULL, cpu) *
|
|
||||||
policy->cpuinfo.max_freq / 1000UL;
|
|
||||||
capacity_scale = max(raw_capacity[cpu], capacity_scale);
|
|
||||||
}
|
|
||||||
if (cpumask_empty(cpus_to_visit)) {
|
|
||||||
normalize_cpu_capacity();
|
|
||||||
kfree(raw_capacity);
|
|
||||||
pr_debug("cpu_capacity: parsing done\n");
|
|
||||||
cap_parsing_done = true;
|
|
||||||
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)
|
|
||||||
{
|
|
||||||
/*
|
|
||||||
* on ACPI-based systems we need to use the default cpu capacity
|
|
||||||
* until we have the necessary code to parse the cpu capacity, so
|
|
||||||
* skip registering cpufreq notifier.
|
|
||||||
*/
|
|
||||||
if (!acpi_disabled || cap_parsing_failed)
|
|
||||||
return -EINVAL;
|
|
||||||
|
|
||||||
if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) {
|
|
||||||
pr_err("cpu_capacity: failed to allocate memory for cpus_to_visit\n");
|
|
||||||
return -ENOMEM;
|
|
||||||
}
|
|
||||||
cpumask_copy(cpus_to_visit, cpu_possible_mask);
|
|
||||||
|
|
||||||
return cpufreq_register_notifier(&init_cpu_capacity_notifier,
|
|
||||||
CPUFREQ_POLICY_NOTIFIER);
|
|
||||||
}
|
|
||||||
core_initcall(register_cpufreq_notifier);
|
|
||||||
|
|
||||||
static void parsing_done_workfn(struct work_struct *work)
|
|
||||||
{
|
|
||||||
cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
|
|
||||||
CPUFREQ_POLICY_NOTIFIER);
|
|
||||||
}
|
|
||||||
|
|
||||||
#else
|
|
||||||
static int __init free_raw_capacity(void)
|
|
||||||
{
|
|
||||||
kfree(raw_capacity);
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
core_initcall(free_raw_capacity);
|
|
||||||
#endif
|
|
||||||
|
|
||||||
static int __init get_cpu_for_node(struct device_node *node)
|
static int __init get_cpu_for_node(struct device_node *node)
|
||||||
{
|
{
|
||||||
|
|
|
||||||
|
|
@ -339,4 +339,12 @@ config CMA_ALIGNMENT
|
||||||
|
|
||||||
endif
|
endif
|
||||||
|
|
||||||
|
config GENERIC_ARCH_TOPOLOGY
|
||||||
|
bool
|
||||||
|
help
|
||||||
|
Enable support for architectures common topology code: e.g., parsing
|
||||||
|
CPU capacity information from DT, usage of such information for
|
||||||
|
appropriate scaling, sysfs interface for changing capacity values at
|
||||||
|
runtime.
|
||||||
|
|
||||||
endmenu
|
endmenu
|
||||||
|
|
|
||||||
|
|
@ -23,6 +23,7 @@ obj-$(CONFIG_SOC_BUS) += soc.o
|
||||||
obj-$(CONFIG_PINCTRL) += pinctrl.o
|
obj-$(CONFIG_PINCTRL) += pinctrl.o
|
||||||
obj-$(CONFIG_DEV_COREDUMP) += devcoredump.o
|
obj-$(CONFIG_DEV_COREDUMP) += devcoredump.o
|
||||||
obj-$(CONFIG_GENERIC_MSI_IRQ_DOMAIN) += platform-msi.o
|
obj-$(CONFIG_GENERIC_MSI_IRQ_DOMAIN) += platform-msi.o
|
||||||
|
obj-$(CONFIG_GENERIC_ARCH_TOPOLOGY) += arch_topology.o
|
||||||
|
|
||||||
obj-y += test/
|
obj-y += test/
|
||||||
|
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,242 @@
|
||||||
|
/*
|
||||||
|
* Arch specific cpu topology information
|
||||||
|
*
|
||||||
|
* Copyright (C) 2016, ARM Ltd.
|
||||||
|
* Written by: Juri Lelli, ARM Ltd.
|
||||||
|
*
|
||||||
|
* This file is subject to the terms and conditions of the GNU General Public
|
||||||
|
* License. See the file "COPYING" in the main directory of this archive
|
||||||
|
* for more details.
|
||||||
|
*
|
||||||
|
* Released under the GPLv2 only.
|
||||||
|
* SPDX-License-Identifier: GPL-2.0
|
||||||
|
*/
|
||||||
|
|
||||||
|
#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/string.h>
|
||||||
|
#include <linux/sched/topology.h>
|
||||||
|
|
||||||
|
static DEFINE_MUTEX(cpu_scale_mutex);
|
||||||
|
static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
|
||||||
|
|
||||||
|
unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
|
||||||
|
{
|
||||||
|
return per_cpu(cpu_scale, cpu);
|
||||||
|
}
|
||||||
|
|
||||||
|
void set_capacity_scale(unsigned int cpu, unsigned long capacity)
|
||||||
|
{
|
||||||
|
per_cpu(cpu_scale, cpu) = capacity;
|
||||||
|
}
|
||||||
|
|
||||||
|
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 sprintf(buf, "%lu\n",
|
||||||
|
arch_scale_cpu_capacity(NULL, cpu->dev.id));
|
||||||
|
}
|
||||||
|
|
||||||
|
static ssize_t cpu_capacity_store(struct device *dev,
|
||||||
|
struct device_attribute *attr,
|
||||||
|
const char *buf,
|
||||||
|
size_t count)
|
||||||
|
{
|
||||||
|
struct cpu *cpu = container_of(dev, struct cpu, dev);
|
||||||
|
int this_cpu = cpu->dev.id;
|
||||||
|
int i;
|
||||||
|
unsigned long new_capacity;
|
||||||
|
ssize_t ret;
|
||||||
|
|
||||||
|
if (!count)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
ret = kstrtoul(buf, 0, &new_capacity);
|
||||||
|
if (ret)
|
||||||
|
return ret;
|
||||||
|
if (new_capacity > SCHED_CAPACITY_SCALE)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
mutex_lock(&cpu_scale_mutex);
|
||||||
|
for_each_cpu(i, &cpu_topology[this_cpu].core_sibling)
|
||||||
|
set_capacity_scale(i, new_capacity);
|
||||||
|
mutex_unlock(&cpu_scale_mutex);
|
||||||
|
|
||||||
|
return count;
|
||||||
|
}
|
||||||
|
|
||||||
|
static DEVICE_ATTR_RW(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 u32 capacity_scale;
|
||||||
|
static u32 *raw_capacity;
|
||||||
|
bool cap_parsing_failed;
|
||||||
|
|
||||||
|
void normalize_cpu_capacity(void)
|
||||||
|
{
|
||||||
|
u64 capacity;
|
||||||
|
int cpu;
|
||||||
|
|
||||||
|
if (!raw_capacity || cap_parsing_failed)
|
||||||
|
return;
|
||||||
|
|
||||||
|
pr_debug("cpu_capacity: capacity_scale=%u\n", capacity_scale);
|
||||||
|
mutex_lock(&cpu_scale_mutex);
|
||||||
|
for_each_possible_cpu(cpu) {
|
||||||
|
pr_debug("cpu_capacity: cpu=%d raw_capacity=%u\n",
|
||||||
|
cpu, raw_capacity[cpu]);
|
||||||
|
capacity = (raw_capacity[cpu] << SCHED_CAPACITY_SHIFT)
|
||||||
|
/ capacity_scale;
|
||||||
|
set_capacity_scale(cpu, capacity);
|
||||||
|
pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
|
||||||
|
cpu, arch_scale_cpu_capacity(NULL, cpu));
|
||||||
|
}
|
||||||
|
mutex_unlock(&cpu_scale_mutex);
|
||||||
|
}
|
||||||
|
|
||||||
|
int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu)
|
||||||
|
{
|
||||||
|
int ret = 1;
|
||||||
|
u32 cpu_capacity;
|
||||||
|
|
||||||
|
if (cap_parsing_failed)
|
||||||
|
return !ret;
|
||||||
|
|
||||||
|
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) {
|
||||||
|
pr_err("cpu_capacity: failed to allocate memory for raw capacities\n");
|
||||||
|
cap_parsing_failed = true;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
capacity_scale = max(cpu_capacity, capacity_scale);
|
||||||
|
raw_capacity[cpu] = cpu_capacity;
|
||||||
|
pr_debug("cpu_capacity: %s cpu_capacity=%u (raw)\n",
|
||||||
|
cpu_node->full_name, raw_capacity[cpu]);
|
||||||
|
} else {
|
||||||
|
if (raw_capacity) {
|
||||||
|
pr_err("cpu_capacity: missing %s raw capacity\n",
|
||||||
|
cpu_node->full_name);
|
||||||
|
pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
|
||||||
|
}
|
||||||
|
cap_parsing_failed = true;
|
||||||
|
kfree(raw_capacity);
|
||||||
|
}
|
||||||
|
|
||||||
|
return !ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
#ifdef CONFIG_CPU_FREQ
|
||||||
|
static cpumask_var_t cpus_to_visit;
|
||||||
|
static bool cap_parsing_done;
|
||||||
|
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 (cap_parsing_failed || cap_parsing_done)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
switch (val) {
|
||||||
|
case CPUFREQ_NOTIFY:
|
||||||
|
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) {
|
||||||
|
raw_capacity[cpu] = arch_scale_cpu_capacity(NULL, cpu) *
|
||||||
|
policy->cpuinfo.max_freq / 1000UL;
|
||||||
|
capacity_scale = max(raw_capacity[cpu], capacity_scale);
|
||||||
|
}
|
||||||
|
if (cpumask_empty(cpus_to_visit)) {
|
||||||
|
normalize_cpu_capacity();
|
||||||
|
kfree(raw_capacity);
|
||||||
|
pr_debug("cpu_capacity: parsing done\n");
|
||||||
|
cap_parsing_done = true;
|
||||||
|
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)
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* on ACPI-based systems we need to use the default cpu capacity
|
||||||
|
* until we have the necessary code to parse the cpu capacity, so
|
||||||
|
* skip registering cpufreq notifier.
|
||||||
|
*/
|
||||||
|
if (!acpi_disabled || cap_parsing_failed)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) {
|
||||||
|
pr_err("cpu_capacity: failed to allocate memory for cpus_to_visit\n");
|
||||||
|
return -ENOMEM;
|
||||||
|
}
|
||||||
|
|
||||||
|
cpumask_copy(cpus_to_visit, cpu_possible_mask);
|
||||||
|
|
||||||
|
return cpufreq_register_notifier(&init_cpu_capacity_notifier,
|
||||||
|
CPUFREQ_POLICY_NOTIFIER);
|
||||||
|
}
|
||||||
|
core_initcall(register_cpufreq_notifier);
|
||||||
|
|
||||||
|
static void parsing_done_workfn(struct work_struct *work)
|
||||||
|
{
|
||||||
|
cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
|
||||||
|
CPUFREQ_POLICY_NOTIFIER);
|
||||||
|
}
|
||||||
|
|
||||||
|
#else
|
||||||
|
static int __init free_raw_capacity(void)
|
||||||
|
{
|
||||||
|
kfree(raw_capacity);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
core_initcall(free_raw_capacity);
|
||||||
|
#endif
|
||||||
Loading…
Reference in New Issue