606 lines
14 KiB
C
606 lines
14 KiB
C
/*
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* Copyright (C) 2013 Advanced Micro Devices, Inc.
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*
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* Author: Jacob Shin <jacob.shin@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/perf_event.h>
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#include <linux/percpu.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/cpu.h>
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#include <linux/cpumask.h>
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#include <asm/cpufeature.h>
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#include <asm/perf_event.h>
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#include <asm/msr.h>
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#define NUM_COUNTERS_NB 4
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#define NUM_COUNTERS_L2 4
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#define MAX_COUNTERS NUM_COUNTERS_NB
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#define RDPMC_BASE_NB 6
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#define RDPMC_BASE_L2 10
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#define COUNTER_SHIFT 16
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struct amd_uncore {
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int id;
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int refcnt;
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int cpu;
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int num_counters;
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int rdpmc_base;
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u32 msr_base;
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cpumask_t *active_mask;
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struct pmu *pmu;
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struct perf_event *events[MAX_COUNTERS];
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struct amd_uncore *free_when_cpu_online;
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};
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static struct amd_uncore * __percpu *amd_uncore_nb;
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static struct amd_uncore * __percpu *amd_uncore_l2;
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static struct pmu amd_nb_pmu;
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static struct pmu amd_l2_pmu;
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static cpumask_t amd_nb_active_mask;
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static cpumask_t amd_l2_active_mask;
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static bool is_nb_event(struct perf_event *event)
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{
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return event->pmu->type == amd_nb_pmu.type;
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}
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static bool is_l2_event(struct perf_event *event)
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{
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return event->pmu->type == amd_l2_pmu.type;
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}
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static struct amd_uncore *event_to_amd_uncore(struct perf_event *event)
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{
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if (is_nb_event(event) && amd_uncore_nb)
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return *per_cpu_ptr(amd_uncore_nb, event->cpu);
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else if (is_l2_event(event) && amd_uncore_l2)
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return *per_cpu_ptr(amd_uncore_l2, event->cpu);
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return NULL;
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}
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static void amd_uncore_read(struct perf_event *event)
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{
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struct hw_perf_event *hwc = &event->hw;
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u64 prev, new;
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s64 delta;
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/*
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* since we do not enable counter overflow interrupts,
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* we do not have to worry about prev_count changing on us
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*/
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prev = local64_read(&hwc->prev_count);
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rdpmcl(hwc->event_base_rdpmc, new);
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local64_set(&hwc->prev_count, new);
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delta = (new << COUNTER_SHIFT) - (prev << COUNTER_SHIFT);
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delta >>= COUNTER_SHIFT;
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local64_add(delta, &event->count);
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}
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static void amd_uncore_start(struct perf_event *event, int flags)
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{
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struct hw_perf_event *hwc = &event->hw;
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if (flags & PERF_EF_RELOAD)
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wrmsrl(hwc->event_base, (u64)local64_read(&hwc->prev_count));
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hwc->state = 0;
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wrmsrl(hwc->config_base, (hwc->config | ARCH_PERFMON_EVENTSEL_ENABLE));
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perf_event_update_userpage(event);
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}
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static void amd_uncore_stop(struct perf_event *event, int flags)
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{
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struct hw_perf_event *hwc = &event->hw;
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wrmsrl(hwc->config_base, hwc->config);
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hwc->state |= PERF_HES_STOPPED;
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if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {
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amd_uncore_read(event);
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hwc->state |= PERF_HES_UPTODATE;
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}
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}
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static int amd_uncore_add(struct perf_event *event, int flags)
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{
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int i;
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struct amd_uncore *uncore = event_to_amd_uncore(event);
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struct hw_perf_event *hwc = &event->hw;
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/* are we already assigned? */
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if (hwc->idx != -1 && uncore->events[hwc->idx] == event)
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goto out;
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for (i = 0; i < uncore->num_counters; i++) {
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if (uncore->events[i] == event) {
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hwc->idx = i;
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goto out;
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}
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}
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/* if not, take the first available counter */
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hwc->idx = -1;
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for (i = 0; i < uncore->num_counters; i++) {
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if (cmpxchg(&uncore->events[i], NULL, event) == NULL) {
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hwc->idx = i;
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break;
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}
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}
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out:
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if (hwc->idx == -1)
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return -EBUSY;
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hwc->config_base = uncore->msr_base + (2 * hwc->idx);
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hwc->event_base = uncore->msr_base + 1 + (2 * hwc->idx);
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hwc->event_base_rdpmc = uncore->rdpmc_base + hwc->idx;
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hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
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if (flags & PERF_EF_START)
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amd_uncore_start(event, PERF_EF_RELOAD);
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return 0;
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}
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static void amd_uncore_del(struct perf_event *event, int flags)
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{
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int i;
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struct amd_uncore *uncore = event_to_amd_uncore(event);
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struct hw_perf_event *hwc = &event->hw;
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amd_uncore_stop(event, PERF_EF_UPDATE);
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for (i = 0; i < uncore->num_counters; i++) {
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if (cmpxchg(&uncore->events[i], event, NULL) == event)
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break;
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}
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hwc->idx = -1;
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}
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static int amd_uncore_event_init(struct perf_event *event)
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{
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struct amd_uncore *uncore;
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struct hw_perf_event *hwc = &event->hw;
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if (event->attr.type != event->pmu->type)
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return -ENOENT;
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/*
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* NB and L2 counters (MSRs) are shared across all cores that share the
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* same NB / L2 cache. Interrupts can be directed to a single target
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* core, however, event counts generated by processes running on other
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* cores cannot be masked out. So we do not support sampling and
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* per-thread events.
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*/
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if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
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return -EINVAL;
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/* NB and L2 counters do not have usr/os/guest/host bits */
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if (event->attr.exclude_user || event->attr.exclude_kernel ||
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event->attr.exclude_host || event->attr.exclude_guest)
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return -EINVAL;
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/* and we do not enable counter overflow interrupts */
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hwc->config = event->attr.config & AMD64_RAW_EVENT_MASK_NB;
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hwc->idx = -1;
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if (event->cpu < 0)
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return -EINVAL;
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uncore = event_to_amd_uncore(event);
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if (!uncore)
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return -ENODEV;
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/*
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* since request can come in to any of the shared cores, we will remap
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* to a single common cpu.
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*/
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event->cpu = uncore->cpu;
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return 0;
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}
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static ssize_t amd_uncore_attr_show_cpumask(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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cpumask_t *active_mask;
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struct pmu *pmu = dev_get_drvdata(dev);
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if (pmu->type == amd_nb_pmu.type)
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active_mask = &amd_nb_active_mask;
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else if (pmu->type == amd_l2_pmu.type)
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active_mask = &amd_l2_active_mask;
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else
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return 0;
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return cpumap_print_to_pagebuf(true, buf, active_mask);
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}
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static DEVICE_ATTR(cpumask, S_IRUGO, amd_uncore_attr_show_cpumask, NULL);
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static struct attribute *amd_uncore_attrs[] = {
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&dev_attr_cpumask.attr,
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NULL,
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};
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static struct attribute_group amd_uncore_attr_group = {
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.attrs = amd_uncore_attrs,
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};
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PMU_FORMAT_ATTR(event, "config:0-7,32-35");
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PMU_FORMAT_ATTR(umask, "config:8-15");
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static struct attribute *amd_uncore_format_attr[] = {
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&format_attr_event.attr,
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&format_attr_umask.attr,
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NULL,
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};
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static struct attribute_group amd_uncore_format_group = {
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.name = "format",
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.attrs = amd_uncore_format_attr,
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};
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static const struct attribute_group *amd_uncore_attr_groups[] = {
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&amd_uncore_attr_group,
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&amd_uncore_format_group,
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NULL,
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};
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static struct pmu amd_nb_pmu = {
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.task_ctx_nr = perf_invalid_context,
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.attr_groups = amd_uncore_attr_groups,
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.name = "amd_nb",
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.event_init = amd_uncore_event_init,
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.add = amd_uncore_add,
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.del = amd_uncore_del,
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.start = amd_uncore_start,
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.stop = amd_uncore_stop,
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.read = amd_uncore_read,
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};
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static struct pmu amd_l2_pmu = {
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.task_ctx_nr = perf_invalid_context,
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.attr_groups = amd_uncore_attr_groups,
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.name = "amd_l2",
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.event_init = amd_uncore_event_init,
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.add = amd_uncore_add,
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.del = amd_uncore_del,
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.start = amd_uncore_start,
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.stop = amd_uncore_stop,
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.read = amd_uncore_read,
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};
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static struct amd_uncore *amd_uncore_alloc(unsigned int cpu)
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{
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return kzalloc_node(sizeof(struct amd_uncore), GFP_KERNEL,
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cpu_to_node(cpu));
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}
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static int amd_uncore_cpu_up_prepare(unsigned int cpu)
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{
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struct amd_uncore *uncore_nb = NULL, *uncore_l2;
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if (amd_uncore_nb) {
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uncore_nb = amd_uncore_alloc(cpu);
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if (!uncore_nb)
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goto fail;
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uncore_nb->cpu = cpu;
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uncore_nb->num_counters = NUM_COUNTERS_NB;
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uncore_nb->rdpmc_base = RDPMC_BASE_NB;
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uncore_nb->msr_base = MSR_F15H_NB_PERF_CTL;
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uncore_nb->active_mask = &amd_nb_active_mask;
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uncore_nb->pmu = &amd_nb_pmu;
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*per_cpu_ptr(amd_uncore_nb, cpu) = uncore_nb;
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}
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if (amd_uncore_l2) {
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uncore_l2 = amd_uncore_alloc(cpu);
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if (!uncore_l2)
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goto fail;
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uncore_l2->cpu = cpu;
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uncore_l2->num_counters = NUM_COUNTERS_L2;
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uncore_l2->rdpmc_base = RDPMC_BASE_L2;
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uncore_l2->msr_base = MSR_F16H_L2I_PERF_CTL;
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uncore_l2->active_mask = &amd_l2_active_mask;
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uncore_l2->pmu = &amd_l2_pmu;
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*per_cpu_ptr(amd_uncore_l2, cpu) = uncore_l2;
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}
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return 0;
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fail:
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if (amd_uncore_nb)
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*per_cpu_ptr(amd_uncore_nb, cpu) = NULL;
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kfree(uncore_nb);
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return -ENOMEM;
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}
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static struct amd_uncore *
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amd_uncore_find_online_sibling(struct amd_uncore *this,
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struct amd_uncore * __percpu *uncores)
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{
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unsigned int cpu;
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struct amd_uncore *that;
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for_each_online_cpu(cpu) {
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that = *per_cpu_ptr(uncores, cpu);
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if (!that)
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continue;
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if (this == that)
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continue;
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if (this->id == that->id) {
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that->free_when_cpu_online = this;
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this = that;
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break;
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}
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}
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this->refcnt++;
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return this;
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}
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static void amd_uncore_cpu_starting(unsigned int cpu)
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{
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unsigned int eax, ebx, ecx, edx;
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struct amd_uncore *uncore;
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if (amd_uncore_nb) {
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uncore = *per_cpu_ptr(amd_uncore_nb, cpu);
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cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
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uncore->id = ecx & 0xff;
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uncore = amd_uncore_find_online_sibling(uncore, amd_uncore_nb);
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*per_cpu_ptr(amd_uncore_nb, cpu) = uncore;
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}
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if (amd_uncore_l2) {
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unsigned int apicid = cpu_data(cpu).apicid;
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unsigned int nshared;
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uncore = *per_cpu_ptr(amd_uncore_l2, cpu);
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cpuid_count(0x8000001d, 2, &eax, &ebx, &ecx, &edx);
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nshared = ((eax >> 14) & 0xfff) + 1;
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uncore->id = apicid - (apicid % nshared);
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uncore = amd_uncore_find_online_sibling(uncore, amd_uncore_l2);
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*per_cpu_ptr(amd_uncore_l2, cpu) = uncore;
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}
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}
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static void uncore_online(unsigned int cpu,
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struct amd_uncore * __percpu *uncores)
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{
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struct amd_uncore *uncore = *per_cpu_ptr(uncores, cpu);
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kfree(uncore->free_when_cpu_online);
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uncore->free_when_cpu_online = NULL;
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if (cpu == uncore->cpu)
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cpumask_set_cpu(cpu, uncore->active_mask);
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}
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static void amd_uncore_cpu_online(unsigned int cpu)
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{
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if (amd_uncore_nb)
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uncore_online(cpu, amd_uncore_nb);
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if (amd_uncore_l2)
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uncore_online(cpu, amd_uncore_l2);
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}
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static void uncore_down_prepare(unsigned int cpu,
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struct amd_uncore * __percpu *uncores)
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{
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unsigned int i;
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struct amd_uncore *this = *per_cpu_ptr(uncores, cpu);
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if (this->cpu != cpu)
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return;
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/* this cpu is going down, migrate to a shared sibling if possible */
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for_each_online_cpu(i) {
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struct amd_uncore *that = *per_cpu_ptr(uncores, i);
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if (cpu == i)
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continue;
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if (this == that) {
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perf_pmu_migrate_context(this->pmu, cpu, i);
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cpumask_clear_cpu(cpu, that->active_mask);
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cpumask_set_cpu(i, that->active_mask);
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that->cpu = i;
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break;
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}
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}
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}
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static void amd_uncore_cpu_down_prepare(unsigned int cpu)
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{
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if (amd_uncore_nb)
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uncore_down_prepare(cpu, amd_uncore_nb);
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if (amd_uncore_l2)
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uncore_down_prepare(cpu, amd_uncore_l2);
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}
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static void uncore_dead(unsigned int cpu, struct amd_uncore * __percpu *uncores)
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{
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struct amd_uncore *uncore = *per_cpu_ptr(uncores, cpu);
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if (cpu == uncore->cpu)
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cpumask_clear_cpu(cpu, uncore->active_mask);
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if (!--uncore->refcnt)
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kfree(uncore);
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*per_cpu_ptr(uncores, cpu) = NULL;
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}
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static void amd_uncore_cpu_dead(unsigned int cpu)
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{
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if (amd_uncore_nb)
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uncore_dead(cpu, amd_uncore_nb);
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if (amd_uncore_l2)
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uncore_dead(cpu, amd_uncore_l2);
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}
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static int
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amd_uncore_cpu_notifier(struct notifier_block *self, unsigned long action,
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void *hcpu)
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{
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unsigned int cpu = (long)hcpu;
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switch (action & ~CPU_TASKS_FROZEN) {
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case CPU_UP_PREPARE:
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if (amd_uncore_cpu_up_prepare(cpu))
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return notifier_from_errno(-ENOMEM);
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break;
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case CPU_STARTING:
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amd_uncore_cpu_starting(cpu);
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break;
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case CPU_ONLINE:
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amd_uncore_cpu_online(cpu);
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break;
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case CPU_DOWN_PREPARE:
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amd_uncore_cpu_down_prepare(cpu);
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break;
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case CPU_UP_CANCELED:
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case CPU_DEAD:
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amd_uncore_cpu_dead(cpu);
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break;
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default:
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block amd_uncore_cpu_notifier_block = {
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.notifier_call = amd_uncore_cpu_notifier,
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.priority = CPU_PRI_PERF + 1,
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};
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static void __init init_cpu_already_online(void *dummy)
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{
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unsigned int cpu = smp_processor_id();
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amd_uncore_cpu_starting(cpu);
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amd_uncore_cpu_online(cpu);
|
|
}
|
|
|
|
static void cleanup_cpu_online(void *dummy)
|
|
{
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
amd_uncore_cpu_dead(cpu);
|
|
}
|
|
|
|
static int __init amd_uncore_init(void)
|
|
{
|
|
unsigned int cpu, cpu2;
|
|
int ret = -ENODEV;
|
|
|
|
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
|
|
goto fail_nodev;
|
|
|
|
if (!boot_cpu_has(X86_FEATURE_TOPOEXT))
|
|
goto fail_nodev;
|
|
|
|
if (boot_cpu_has(X86_FEATURE_PERFCTR_NB)) {
|
|
amd_uncore_nb = alloc_percpu(struct amd_uncore *);
|
|
if (!amd_uncore_nb) {
|
|
ret = -ENOMEM;
|
|
goto fail_nb;
|
|
}
|
|
ret = perf_pmu_register(&amd_nb_pmu, amd_nb_pmu.name, -1);
|
|
if (ret)
|
|
goto fail_nb;
|
|
|
|
pr_info("perf: AMD NB counters detected\n");
|
|
ret = 0;
|
|
}
|
|
|
|
if (boot_cpu_has(X86_FEATURE_PERFCTR_L2)) {
|
|
amd_uncore_l2 = alloc_percpu(struct amd_uncore *);
|
|
if (!amd_uncore_l2) {
|
|
ret = -ENOMEM;
|
|
goto fail_l2;
|
|
}
|
|
ret = perf_pmu_register(&amd_l2_pmu, amd_l2_pmu.name, -1);
|
|
if (ret)
|
|
goto fail_l2;
|
|
|
|
pr_info("perf: AMD L2I counters detected\n");
|
|
ret = 0;
|
|
}
|
|
|
|
if (ret)
|
|
goto fail_nodev;
|
|
|
|
cpu_notifier_register_begin();
|
|
|
|
/* init cpus already online before registering for hotplug notifier */
|
|
for_each_online_cpu(cpu) {
|
|
ret = amd_uncore_cpu_up_prepare(cpu);
|
|
if (ret)
|
|
goto fail_online;
|
|
smp_call_function_single(cpu, init_cpu_already_online, NULL, 1);
|
|
}
|
|
|
|
__register_cpu_notifier(&amd_uncore_cpu_notifier_block);
|
|
cpu_notifier_register_done();
|
|
|
|
return 0;
|
|
|
|
|
|
fail_online:
|
|
for_each_online_cpu(cpu2) {
|
|
if (cpu2 == cpu)
|
|
break;
|
|
smp_call_function_single(cpu, cleanup_cpu_online, NULL, 1);
|
|
}
|
|
cpu_notifier_register_done();
|
|
|
|
/* amd_uncore_nb/l2 should have been freed by cleanup_cpu_online */
|
|
amd_uncore_nb = amd_uncore_l2 = NULL;
|
|
|
|
if (boot_cpu_has(X86_FEATURE_PERFCTR_L2))
|
|
perf_pmu_unregister(&amd_l2_pmu);
|
|
fail_l2:
|
|
if (boot_cpu_has(X86_FEATURE_PERFCTR_NB))
|
|
perf_pmu_unregister(&amd_nb_pmu);
|
|
if (amd_uncore_l2)
|
|
free_percpu(amd_uncore_l2);
|
|
fail_nb:
|
|
if (amd_uncore_nb)
|
|
free_percpu(amd_uncore_nb);
|
|
|
|
fail_nodev:
|
|
return ret;
|
|
}
|
|
device_initcall(amd_uncore_init);
|