| /* |
| * perf_event_intel_rapl.c: support Intel RAPL energy consumption counters |
| * Copyright (C) 2013 Google, Inc., Stephane Eranian |
| * |
| * Intel RAPL interface is specified in the IA-32 Manual Vol3b |
| * section 14.7.1 (September 2013) |
| * |
| * RAPL provides more controls than just reporting energy consumption |
| * however here we only expose the 3 energy consumption free running |
| * counters (pp0, pkg, dram). |
| * |
| * Each of those counters increments in a power unit defined by the |
| * RAPL_POWER_UNIT MSR. On SandyBridge, this unit is 1/(2^16) Joules |
| * but it can vary. |
| * |
| * Counter to rapl events mappings: |
| * |
| * pp0 counter: consumption of all physical cores (power plane 0) |
| * event: rapl_energy_cores |
| * perf code: 0x1 |
| * |
| * pkg counter: consumption of the whole processor package |
| * event: rapl_energy_pkg |
| * perf code: 0x2 |
| * |
| * dram counter: consumption of the dram domain (servers only) |
| * event: rapl_energy_dram |
| * perf code: 0x3 |
| * |
| * dram counter: consumption of the builtin-gpu domain (client only) |
| * event: rapl_energy_gpu |
| * perf code: 0x4 |
| * |
| * We manage those counters as free running (read-only). They may be |
| * use simultaneously by other tools, such as turbostat. |
| * |
| * The events only support system-wide mode counting. There is no |
| * sampling support because it does not make sense and is not |
| * supported by the RAPL hardware. |
| * |
| * Because we want to avoid floating-point operations in the kernel, |
| * the events are all reported in fixed point arithmetic (32.32). |
| * Tools must adjust the counts to convert them to Watts using |
| * the duration of the measurement. Tools may use a function such as |
| * ldexp(raw_count, -32); |
| */ |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/perf_event.h> |
| #include <asm/cpu_device_id.h> |
| #include "perf_event.h" |
| |
| /* |
| * RAPL energy status counters |
| */ |
| #define RAPL_IDX_PP0_NRG_STAT 0 /* all cores */ |
| #define INTEL_RAPL_PP0 0x1 /* pseudo-encoding */ |
| #define RAPL_IDX_PKG_NRG_STAT 1 /* entire package */ |
| #define INTEL_RAPL_PKG 0x2 /* pseudo-encoding */ |
| #define RAPL_IDX_RAM_NRG_STAT 2 /* DRAM */ |
| #define INTEL_RAPL_RAM 0x3 /* pseudo-encoding */ |
| #define RAPL_IDX_PP1_NRG_STAT 3 /* gpu */ |
| #define INTEL_RAPL_PP1 0x4 /* pseudo-encoding */ |
| |
| #define NR_RAPL_DOMAINS 0x4 |
| static const char *rapl_domain_names[NR_RAPL_DOMAINS] __initconst = { |
| "pp0-core", |
| "package", |
| "dram", |
| "pp1-gpu", |
| }; |
| |
| /* Clients have PP0, PKG */ |
| #define RAPL_IDX_CLN (1<<RAPL_IDX_PP0_NRG_STAT|\ |
| 1<<RAPL_IDX_PKG_NRG_STAT|\ |
| 1<<RAPL_IDX_PP1_NRG_STAT) |
| |
| /* Servers have PP0, PKG, RAM */ |
| #define RAPL_IDX_SRV (1<<RAPL_IDX_PP0_NRG_STAT|\ |
| 1<<RAPL_IDX_PKG_NRG_STAT|\ |
| 1<<RAPL_IDX_RAM_NRG_STAT) |
| |
| /* Servers have PP0, PKG, RAM, PP1 */ |
| #define RAPL_IDX_HSW (1<<RAPL_IDX_PP0_NRG_STAT|\ |
| 1<<RAPL_IDX_PKG_NRG_STAT|\ |
| 1<<RAPL_IDX_RAM_NRG_STAT|\ |
| 1<<RAPL_IDX_PP1_NRG_STAT) |
| |
| /* |
| * event code: LSB 8 bits, passed in attr->config |
| * any other bit is reserved |
| */ |
| #define RAPL_EVENT_MASK 0xFFULL |
| |
| #define DEFINE_RAPL_FORMAT_ATTR(_var, _name, _format) \ |
| static ssize_t __rapl_##_var##_show(struct kobject *kobj, \ |
| struct kobj_attribute *attr, \ |
| char *page) \ |
| { \ |
| BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \ |
| return sprintf(page, _format "\n"); \ |
| } \ |
| static struct kobj_attribute format_attr_##_var = \ |
| __ATTR(_name, 0444, __rapl_##_var##_show, NULL) |
| |
| #define RAPL_EVENT_DESC(_name, _config) \ |
| { \ |
| .attr = __ATTR(_name, 0444, rapl_event_show, NULL), \ |
| .config = _config, \ |
| } |
| |
| #define RAPL_CNTR_WIDTH 32 /* 32-bit rapl counters */ |
| |
| #define RAPL_EVENT_ATTR_STR(_name, v, str) \ |
| static struct perf_pmu_events_attr event_attr_##v = { \ |
| .attr = __ATTR(_name, 0444, rapl_sysfs_show, NULL), \ |
| .id = 0, \ |
| .event_str = str, \ |
| }; |
| |
| struct rapl_pmu { |
| spinlock_t lock; |
| int n_active; /* number of active events */ |
| struct list_head active_list; |
| struct pmu *pmu; /* pointer to rapl_pmu_class */ |
| ktime_t timer_interval; /* in ktime_t unit */ |
| struct hrtimer hrtimer; |
| }; |
| |
| static int rapl_hw_unit[NR_RAPL_DOMAINS] __read_mostly; /* 1/2^hw_unit Joule */ |
| static struct pmu rapl_pmu_class; |
| static cpumask_t rapl_cpu_mask; |
| static int rapl_cntr_mask; |
| |
| static DEFINE_PER_CPU(struct rapl_pmu *, rapl_pmu); |
| static DEFINE_PER_CPU(struct rapl_pmu *, rapl_pmu_to_free); |
| |
| static struct x86_pmu_quirk *rapl_quirks; |
| static inline u64 rapl_read_counter(struct perf_event *event) |
| { |
| u64 raw; |
| rdmsrl(event->hw.event_base, raw); |
| return raw; |
| } |
| |
| #define rapl_add_quirk(func_) \ |
| do { \ |
| static struct x86_pmu_quirk __quirk __initdata = { \ |
| .func = func_, \ |
| }; \ |
| __quirk.next = rapl_quirks; \ |
| rapl_quirks = &__quirk; \ |
| } while (0) |
| |
| static inline u64 rapl_scale(u64 v, int cfg) |
| { |
| if (cfg > NR_RAPL_DOMAINS) { |
| pr_warn("invalid domain %d, failed to scale data\n", cfg); |
| return v; |
| } |
| /* |
| * scale delta to smallest unit (1/2^32) |
| * users must then scale back: count * 1/(1e9*2^32) to get Joules |
| * or use ldexp(count, -32). |
| * Watts = Joules/Time delta |
| */ |
| return v << (32 - rapl_hw_unit[cfg - 1]); |
| } |
| |
| static u64 rapl_event_update(struct perf_event *event) |
| { |
| struct hw_perf_event *hwc = &event->hw; |
| u64 prev_raw_count, new_raw_count; |
| s64 delta, sdelta; |
| int shift = RAPL_CNTR_WIDTH; |
| |
| again: |
| prev_raw_count = local64_read(&hwc->prev_count); |
| rdmsrl(event->hw.event_base, new_raw_count); |
| |
| if (local64_cmpxchg(&hwc->prev_count, prev_raw_count, |
| new_raw_count) != prev_raw_count) { |
| cpu_relax(); |
| goto again; |
| } |
| |
| /* |
| * Now we have the new raw value and have updated the prev |
| * timestamp already. We can now calculate the elapsed delta |
| * (event-)time and add that to the generic event. |
| * |
| * Careful, not all hw sign-extends above the physical width |
| * of the count. |
| */ |
| delta = (new_raw_count << shift) - (prev_raw_count << shift); |
| delta >>= shift; |
| |
| sdelta = rapl_scale(delta, event->hw.config); |
| |
| local64_add(sdelta, &event->count); |
| |
| return new_raw_count; |
| } |
| |
| static void rapl_start_hrtimer(struct rapl_pmu *pmu) |
| { |
| __hrtimer_start_range_ns(&pmu->hrtimer, |
| pmu->timer_interval, 0, |
| HRTIMER_MODE_REL_PINNED, 0); |
| } |
| |
| static void rapl_stop_hrtimer(struct rapl_pmu *pmu) |
| { |
| hrtimer_cancel(&pmu->hrtimer); |
| } |
| |
| static enum hrtimer_restart rapl_hrtimer_handle(struct hrtimer *hrtimer) |
| { |
| struct rapl_pmu *pmu = __this_cpu_read(rapl_pmu); |
| struct perf_event *event; |
| unsigned long flags; |
| |
| if (!pmu->n_active) |
| return HRTIMER_NORESTART; |
| |
| spin_lock_irqsave(&pmu->lock, flags); |
| |
| list_for_each_entry(event, &pmu->active_list, active_entry) { |
| rapl_event_update(event); |
| } |
| |
| spin_unlock_irqrestore(&pmu->lock, flags); |
| |
| hrtimer_forward_now(hrtimer, pmu->timer_interval); |
| |
| return HRTIMER_RESTART; |
| } |
| |
| static void rapl_hrtimer_init(struct rapl_pmu *pmu) |
| { |
| struct hrtimer *hr = &pmu->hrtimer; |
| |
| hrtimer_init(hr, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| hr->function = rapl_hrtimer_handle; |
| } |
| |
| static void __rapl_pmu_event_start(struct rapl_pmu *pmu, |
| struct perf_event *event) |
| { |
| if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED))) |
| return; |
| |
| event->hw.state = 0; |
| |
| list_add_tail(&event->active_entry, &pmu->active_list); |
| |
| local64_set(&event->hw.prev_count, rapl_read_counter(event)); |
| |
| pmu->n_active++; |
| if (pmu->n_active == 1) |
| rapl_start_hrtimer(pmu); |
| } |
| |
| static void rapl_pmu_event_start(struct perf_event *event, int mode) |
| { |
| struct rapl_pmu *pmu = __this_cpu_read(rapl_pmu); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&pmu->lock, flags); |
| __rapl_pmu_event_start(pmu, event); |
| spin_unlock_irqrestore(&pmu->lock, flags); |
| } |
| |
| static void rapl_pmu_event_stop(struct perf_event *event, int mode) |
| { |
| struct rapl_pmu *pmu = __this_cpu_read(rapl_pmu); |
| struct hw_perf_event *hwc = &event->hw; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&pmu->lock, flags); |
| |
| /* mark event as deactivated and stopped */ |
| if (!(hwc->state & PERF_HES_STOPPED)) { |
| WARN_ON_ONCE(pmu->n_active <= 0); |
| pmu->n_active--; |
| if (pmu->n_active == 0) |
| rapl_stop_hrtimer(pmu); |
| |
| list_del(&event->active_entry); |
| |
| WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED); |
| hwc->state |= PERF_HES_STOPPED; |
| } |
| |
| /* check if update of sw counter is necessary */ |
| if ((mode & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) { |
| /* |
| * Drain the remaining delta count out of a event |
| * that we are disabling: |
| */ |
| rapl_event_update(event); |
| hwc->state |= PERF_HES_UPTODATE; |
| } |
| |
| spin_unlock_irqrestore(&pmu->lock, flags); |
| } |
| |
| static int rapl_pmu_event_add(struct perf_event *event, int mode) |
| { |
| struct rapl_pmu *pmu = __this_cpu_read(rapl_pmu); |
| struct hw_perf_event *hwc = &event->hw; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&pmu->lock, flags); |
| |
| hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED; |
| |
| if (mode & PERF_EF_START) |
| __rapl_pmu_event_start(pmu, event); |
| |
| spin_unlock_irqrestore(&pmu->lock, flags); |
| |
| return 0; |
| } |
| |
| static void rapl_pmu_event_del(struct perf_event *event, int flags) |
| { |
| rapl_pmu_event_stop(event, PERF_EF_UPDATE); |
| } |
| |
| static int rapl_pmu_event_init(struct perf_event *event) |
| { |
| u64 cfg = event->attr.config & RAPL_EVENT_MASK; |
| int bit, msr, ret = 0; |
| |
| /* only look at RAPL events */ |
| if (event->attr.type != rapl_pmu_class.type) |
| return -ENOENT; |
| |
| /* check only supported bits are set */ |
| if (event->attr.config & ~RAPL_EVENT_MASK) |
| return -EINVAL; |
| |
| /* |
| * check event is known (determines counter) |
| */ |
| switch (cfg) { |
| case INTEL_RAPL_PP0: |
| bit = RAPL_IDX_PP0_NRG_STAT; |
| msr = MSR_PP0_ENERGY_STATUS; |
| break; |
| case INTEL_RAPL_PKG: |
| bit = RAPL_IDX_PKG_NRG_STAT; |
| msr = MSR_PKG_ENERGY_STATUS; |
| break; |
| case INTEL_RAPL_RAM: |
| bit = RAPL_IDX_RAM_NRG_STAT; |
| msr = MSR_DRAM_ENERGY_STATUS; |
| break; |
| case INTEL_RAPL_PP1: |
| bit = RAPL_IDX_PP1_NRG_STAT; |
| msr = MSR_PP1_ENERGY_STATUS; |
| break; |
| default: |
| return -EINVAL; |
| } |
| /* check event supported */ |
| if (!(rapl_cntr_mask & (1 << bit))) |
| return -EINVAL; |
| |
| /* unsupported modes and filters */ |
| if (event->attr.exclude_user || |
| event->attr.exclude_kernel || |
| event->attr.exclude_hv || |
| event->attr.exclude_idle || |
| event->attr.exclude_host || |
| event->attr.exclude_guest || |
| event->attr.sample_period) /* no sampling */ |
| return -EINVAL; |
| |
| /* must be done before validate_group */ |
| event->hw.event_base = msr; |
| event->hw.config = cfg; |
| event->hw.idx = bit; |
| |
| return ret; |
| } |
| |
| static void rapl_pmu_event_read(struct perf_event *event) |
| { |
| rapl_event_update(event); |
| } |
| |
| static ssize_t rapl_get_attr_cpumask(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return cpumap_print_to_pagebuf(true, buf, &rapl_cpu_mask); |
| } |
| |
| static DEVICE_ATTR(cpumask, S_IRUGO, rapl_get_attr_cpumask, NULL); |
| |
| static struct attribute *rapl_pmu_attrs[] = { |
| &dev_attr_cpumask.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group rapl_pmu_attr_group = { |
| .attrs = rapl_pmu_attrs, |
| }; |
| |
| static ssize_t rapl_sysfs_show(struct device *dev, |
| struct device_attribute *attr, |
| char *page) |
| { |
| struct perf_pmu_events_attr *pmu_attr = \ |
| container_of(attr, struct perf_pmu_events_attr, attr); |
| |
| if (pmu_attr->event_str) |
| return sprintf(page, "%s", pmu_attr->event_str); |
| |
| return 0; |
| } |
| |
| RAPL_EVENT_ATTR_STR(energy-cores, rapl_cores, "event=0x01"); |
| RAPL_EVENT_ATTR_STR(energy-pkg , rapl_pkg, "event=0x02"); |
| RAPL_EVENT_ATTR_STR(energy-ram , rapl_ram, "event=0x03"); |
| RAPL_EVENT_ATTR_STR(energy-gpu , rapl_gpu, "event=0x04"); |
| |
| RAPL_EVENT_ATTR_STR(energy-cores.unit, rapl_cores_unit, "Joules"); |
| RAPL_EVENT_ATTR_STR(energy-pkg.unit , rapl_pkg_unit, "Joules"); |
| RAPL_EVENT_ATTR_STR(energy-ram.unit , rapl_ram_unit, "Joules"); |
| RAPL_EVENT_ATTR_STR(energy-gpu.unit , rapl_gpu_unit, "Joules"); |
| |
| /* |
| * we compute in 0.23 nJ increments regardless of MSR |
| */ |
| RAPL_EVENT_ATTR_STR(energy-cores.scale, rapl_cores_scale, "2.3283064365386962890625e-10"); |
| RAPL_EVENT_ATTR_STR(energy-pkg.scale, rapl_pkg_scale, "2.3283064365386962890625e-10"); |
| RAPL_EVENT_ATTR_STR(energy-ram.scale, rapl_ram_scale, "2.3283064365386962890625e-10"); |
| RAPL_EVENT_ATTR_STR(energy-gpu.scale, rapl_gpu_scale, "2.3283064365386962890625e-10"); |
| |
| static struct attribute *rapl_events_srv_attr[] = { |
| EVENT_PTR(rapl_cores), |
| EVENT_PTR(rapl_pkg), |
| EVENT_PTR(rapl_ram), |
| |
| EVENT_PTR(rapl_cores_unit), |
| EVENT_PTR(rapl_pkg_unit), |
| EVENT_PTR(rapl_ram_unit), |
| |
| EVENT_PTR(rapl_cores_scale), |
| EVENT_PTR(rapl_pkg_scale), |
| EVENT_PTR(rapl_ram_scale), |
| NULL, |
| }; |
| |
| static struct attribute *rapl_events_cln_attr[] = { |
| EVENT_PTR(rapl_cores), |
| EVENT_PTR(rapl_pkg), |
| EVENT_PTR(rapl_gpu), |
| |
| EVENT_PTR(rapl_cores_unit), |
| EVENT_PTR(rapl_pkg_unit), |
| EVENT_PTR(rapl_gpu_unit), |
| |
| EVENT_PTR(rapl_cores_scale), |
| EVENT_PTR(rapl_pkg_scale), |
| EVENT_PTR(rapl_gpu_scale), |
| NULL, |
| }; |
| |
| static struct attribute *rapl_events_hsw_attr[] = { |
| EVENT_PTR(rapl_cores), |
| EVENT_PTR(rapl_pkg), |
| EVENT_PTR(rapl_gpu), |
| EVENT_PTR(rapl_ram), |
| |
| EVENT_PTR(rapl_cores_unit), |
| EVENT_PTR(rapl_pkg_unit), |
| EVENT_PTR(rapl_gpu_unit), |
| EVENT_PTR(rapl_ram_unit), |
| |
| EVENT_PTR(rapl_cores_scale), |
| EVENT_PTR(rapl_pkg_scale), |
| EVENT_PTR(rapl_gpu_scale), |
| EVENT_PTR(rapl_ram_scale), |
| NULL, |
| }; |
| |
| static struct attribute_group rapl_pmu_events_group = { |
| .name = "events", |
| .attrs = NULL, /* patched at runtime */ |
| }; |
| |
| DEFINE_RAPL_FORMAT_ATTR(event, event, "config:0-7"); |
| static struct attribute *rapl_formats_attr[] = { |
| &format_attr_event.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group rapl_pmu_format_group = { |
| .name = "format", |
| .attrs = rapl_formats_attr, |
| }; |
| |
| const struct attribute_group *rapl_attr_groups[] = { |
| &rapl_pmu_attr_group, |
| &rapl_pmu_format_group, |
| &rapl_pmu_events_group, |
| NULL, |
| }; |
| |
| static struct pmu rapl_pmu_class = { |
| .attr_groups = rapl_attr_groups, |
| .task_ctx_nr = perf_invalid_context, /* system-wide only */ |
| .event_init = rapl_pmu_event_init, |
| .add = rapl_pmu_event_add, /* must have */ |
| .del = rapl_pmu_event_del, /* must have */ |
| .start = rapl_pmu_event_start, |
| .stop = rapl_pmu_event_stop, |
| .read = rapl_pmu_event_read, |
| }; |
| |
| static void rapl_cpu_exit(int cpu) |
| { |
| struct rapl_pmu *pmu = per_cpu(rapl_pmu, cpu); |
| int i, phys_id = topology_physical_package_id(cpu); |
| int target = -1; |
| |
| /* find a new cpu on same package */ |
| for_each_online_cpu(i) { |
| if (i == cpu) |
| continue; |
| if (phys_id == topology_physical_package_id(i)) { |
| target = i; |
| break; |
| } |
| } |
| /* |
| * clear cpu from cpumask |
| * if was set in cpumask and still some cpu on package, |
| * then move to new cpu |
| */ |
| if (cpumask_test_and_clear_cpu(cpu, &rapl_cpu_mask) && target >= 0) |
| cpumask_set_cpu(target, &rapl_cpu_mask); |
| |
| WARN_ON(cpumask_empty(&rapl_cpu_mask)); |
| /* |
| * migrate events and context to new cpu |
| */ |
| if (target >= 0) |
| perf_pmu_migrate_context(pmu->pmu, cpu, target); |
| |
| /* cancel overflow polling timer for CPU */ |
| rapl_stop_hrtimer(pmu); |
| } |
| |
| static void rapl_cpu_init(int cpu) |
| { |
| int i, phys_id = topology_physical_package_id(cpu); |
| |
| /* check if phys_is is already covered */ |
| for_each_cpu(i, &rapl_cpu_mask) { |
| if (phys_id == topology_physical_package_id(i)) |
| return; |
| } |
| /* was not found, so add it */ |
| cpumask_set_cpu(cpu, &rapl_cpu_mask); |
| } |
| |
| static __init void rapl_hsw_server_quirk(void) |
| { |
| /* |
| * DRAM domain on HSW server has fixed energy unit which can be |
| * different than the unit from power unit MSR. |
| * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2 |
| * of 2. Datasheet, September 2014, Reference Number: 330784-001 " |
| */ |
| rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16; |
| } |
| |
| static int rapl_cpu_prepare(int cpu) |
| { |
| struct rapl_pmu *pmu = per_cpu(rapl_pmu, cpu); |
| int phys_id = topology_physical_package_id(cpu); |
| u64 ms; |
| |
| if (pmu) |
| return 0; |
| |
| if (phys_id < 0) |
| return -1; |
| |
| pmu = kzalloc_node(sizeof(*pmu), GFP_KERNEL, cpu_to_node(cpu)); |
| if (!pmu) |
| return -1; |
| spin_lock_init(&pmu->lock); |
| |
| INIT_LIST_HEAD(&pmu->active_list); |
| |
| pmu->pmu = &rapl_pmu_class; |
| |
| /* |
| * use reference of 200W for scaling the timeout |
| * to avoid missing counter overflows. |
| * 200W = 200 Joules/sec |
| * divide interval by 2 to avoid lockstep (2 * 100) |
| * if hw unit is 32, then we use 2 ms 1/200/2 |
| */ |
| if (rapl_hw_unit[0] < 32) |
| ms = (1000 / (2 * 100)) * (1ULL << (32 - rapl_hw_unit[0] - 1)); |
| else |
| ms = 2; |
| |
| pmu->timer_interval = ms_to_ktime(ms); |
| |
| rapl_hrtimer_init(pmu); |
| |
| /* set RAPL pmu for this cpu for now */ |
| per_cpu(rapl_pmu, cpu) = pmu; |
| per_cpu(rapl_pmu_to_free, cpu) = NULL; |
| |
| return 0; |
| } |
| |
| static void rapl_cpu_kfree(int cpu) |
| { |
| struct rapl_pmu *pmu = per_cpu(rapl_pmu_to_free, cpu); |
| |
| kfree(pmu); |
| |
| per_cpu(rapl_pmu_to_free, cpu) = NULL; |
| } |
| |
| static int rapl_cpu_dying(int cpu) |
| { |
| struct rapl_pmu *pmu = per_cpu(rapl_pmu, cpu); |
| |
| if (!pmu) |
| return 0; |
| |
| per_cpu(rapl_pmu, cpu) = NULL; |
| |
| per_cpu(rapl_pmu_to_free, cpu) = pmu; |
| |
| return 0; |
| } |
| |
| static int rapl_cpu_notifier(struct notifier_block *self, |
| unsigned long action, void *hcpu) |
| { |
| unsigned int cpu = (long)hcpu; |
| |
| switch (action & ~CPU_TASKS_FROZEN) { |
| case CPU_UP_PREPARE: |
| rapl_cpu_prepare(cpu); |
| break; |
| case CPU_STARTING: |
| rapl_cpu_init(cpu); |
| break; |
| case CPU_UP_CANCELED: |
| case CPU_DYING: |
| rapl_cpu_dying(cpu); |
| break; |
| case CPU_ONLINE: |
| case CPU_DEAD: |
| rapl_cpu_kfree(cpu); |
| break; |
| case CPU_DOWN_PREPARE: |
| rapl_cpu_exit(cpu); |
| break; |
| default: |
| break; |
| } |
| |
| return NOTIFY_OK; |
| } |
| |
| static int rapl_check_hw_unit(void) |
| { |
| u64 msr_rapl_power_unit_bits; |
| int i; |
| |
| /* protect rdmsrl() to handle virtualization */ |
| if (rdmsrl_safe(MSR_RAPL_POWER_UNIT, &msr_rapl_power_unit_bits)) |
| return -1; |
| for (i = 0; i < NR_RAPL_DOMAINS; i++) |
| rapl_hw_unit[i] = (msr_rapl_power_unit_bits >> 8) & 0x1FULL; |
| |
| return 0; |
| } |
| |
| static const struct x86_cpu_id rapl_cpu_match[] = { |
| [0] = { .vendor = X86_VENDOR_INTEL, .family = 6 }, |
| [1] = {}, |
| }; |
| |
| static int __init rapl_pmu_init(void) |
| { |
| struct rapl_pmu *pmu; |
| int cpu, ret; |
| struct x86_pmu_quirk *quirk; |
| int i; |
| |
| /* |
| * check for Intel processor family 6 |
| */ |
| if (!x86_match_cpu(rapl_cpu_match)) |
| return 0; |
| |
| /* check supported CPU */ |
| switch (boot_cpu_data.x86_model) { |
| case 42: /* Sandy Bridge */ |
| case 58: /* Ivy Bridge */ |
| rapl_cntr_mask = RAPL_IDX_CLN; |
| rapl_pmu_events_group.attrs = rapl_events_cln_attr; |
| break; |
| case 63: /* Haswell-Server */ |
| rapl_add_quirk(rapl_hsw_server_quirk); |
| rapl_cntr_mask = RAPL_IDX_SRV; |
| rapl_pmu_events_group.attrs = rapl_events_srv_attr; |
| break; |
| case 60: /* Haswell */ |
| case 69: /* Haswell-Celeron */ |
| rapl_cntr_mask = RAPL_IDX_HSW; |
| rapl_pmu_events_group.attrs = rapl_events_hsw_attr; |
| break; |
| case 45: /* Sandy Bridge-EP */ |
| case 62: /* IvyTown */ |
| rapl_cntr_mask = RAPL_IDX_SRV; |
| rapl_pmu_events_group.attrs = rapl_events_srv_attr; |
| break; |
| |
| default: |
| /* unsupported */ |
| return 0; |
| } |
| ret = rapl_check_hw_unit(); |
| if (ret) |
| return ret; |
| |
| /* run cpu model quirks */ |
| for (quirk = rapl_quirks; quirk; quirk = quirk->next) |
| quirk->func(); |
| cpu_notifier_register_begin(); |
| |
| for_each_online_cpu(cpu) { |
| ret = rapl_cpu_prepare(cpu); |
| if (ret) |
| goto out; |
| rapl_cpu_init(cpu); |
| } |
| |
| __perf_cpu_notifier(rapl_cpu_notifier); |
| |
| ret = perf_pmu_register(&rapl_pmu_class, "power", -1); |
| if (WARN_ON(ret)) { |
| pr_info("RAPL PMU detected, registration failed (%d), RAPL PMU disabled\n", ret); |
| cpu_notifier_register_done(); |
| return -1; |
| } |
| |
| pmu = __this_cpu_read(rapl_pmu); |
| |
| pr_info("RAPL PMU detected," |
| " API unit is 2^-32 Joules," |
| " %d fixed counters" |
| " %llu ms ovfl timer\n", |
| hweight32(rapl_cntr_mask), |
| ktime_to_ms(pmu->timer_interval)); |
| for (i = 0; i < NR_RAPL_DOMAINS; i++) { |
| if (rapl_cntr_mask & (1 << i)) { |
| pr_info("hw unit of domain %s 2^-%d Joules\n", |
| rapl_domain_names[i], rapl_hw_unit[i]); |
| } |
| } |
| out: |
| cpu_notifier_register_done(); |
| |
| return 0; |
| } |
| device_initcall(rapl_pmu_init); |