^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright 2010 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright 2012 Advanced Micro Devices, Inc., Robert Richter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Perf-events backend for OProfile.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/perf_event.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/oprofile.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Per performance monitor configuration as set via oprofilefs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct op_counter_config {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) unsigned long count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) unsigned long enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) unsigned long event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) unsigned long unit_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) unsigned long kernel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) unsigned long user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct perf_event_attr attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int oprofile_perf_enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static DEFINE_MUTEX(oprofile_perf_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static struct op_counter_config *counter_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static DEFINE_PER_CPU(struct perf_event **, perf_events);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static int num_counters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Overflow callback for oprofile.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void op_overflow_handler(struct perf_event *event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct perf_sample_data *data, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) u32 cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) for (id = 0; id < num_counters; ++id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (per_cpu(perf_events, cpu)[id] == event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (id != num_counters)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) oprofile_add_sample(regs, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) pr_warn("oprofile: ignoring spurious overflow on cpu %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * Called by oprofile_perf_setup to create perf attributes to mirror the oprofile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * settings in counter_config. Attributes are created as `pinned' events and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * so are permanently scheduled on the PMU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static void op_perf_setup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) u32 size = sizeof(struct perf_event_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct perf_event_attr *attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) for (i = 0; i < num_counters; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) attr = &counter_config[i].attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) memset(attr, 0, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) attr->type = PERF_TYPE_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) attr->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) attr->config = counter_config[i].event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) attr->sample_period = counter_config[i].count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) attr->pinned = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static int op_create_counter(int cpu, int event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct perf_event *pevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (!counter_config[event].enabled || per_cpu(perf_events, cpu)[event])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) pevent = perf_event_create_kernel_counter(&counter_config[event].attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) cpu, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) op_overflow_handler, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (IS_ERR(pevent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return PTR_ERR(pevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (pevent->state != PERF_EVENT_STATE_ACTIVE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) perf_event_release_kernel(pevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) pr_warn("oprofile: failed to enable event %d on CPU %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) event, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) per_cpu(perf_events, cpu)[event] = pevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static void op_destroy_counter(int cpu, int event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct perf_event *pevent = per_cpu(perf_events, cpu)[event];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (pevent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) perf_event_release_kernel(pevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) per_cpu(perf_events, cpu)[event] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * Called by oprofile_perf_start to create active perf events based on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * perviously configured attributes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static int op_perf_start(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) int cpu, event, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) for_each_online_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) for (event = 0; event < num_counters; ++event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) ret = op_create_counter(cpu, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * Called by oprofile_perf_stop at the end of a profiling run.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static void op_perf_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) int cpu, event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) for_each_online_cpu(cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) for (event = 0; event < num_counters; ++event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) op_destroy_counter(cpu, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static int oprofile_perf_create_files(struct dentry *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) for (i = 0; i < num_counters; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct dentry *dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) char buf[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) snprintf(buf, sizeof buf, "%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) dir = oprofilefs_mkdir(root, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) oprofilefs_create_ulong(dir, "enabled", &counter_config[i].enabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) oprofilefs_create_ulong(dir, "event", &counter_config[i].event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) oprofilefs_create_ulong(dir, "count", &counter_config[i].count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) oprofilefs_create_ulong(dir, "unit_mask", &counter_config[i].unit_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) oprofilefs_create_ulong(dir, "kernel", &counter_config[i].kernel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) oprofilefs_create_ulong(dir, "user", &counter_config[i].user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static int oprofile_perf_setup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) raw_spin_lock(&oprofilefs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) op_perf_setup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) raw_spin_unlock(&oprofilefs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static int oprofile_perf_start(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) int ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) mutex_lock(&oprofile_perf_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (!oprofile_perf_enabled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) op_perf_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) oprofile_perf_enabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) mutex_unlock(&oprofile_perf_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) static void oprofile_perf_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) mutex_lock(&oprofile_perf_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (oprofile_perf_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) op_perf_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) oprofile_perf_enabled = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) mutex_unlock(&oprofile_perf_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) #ifdef CONFIG_PM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static int oprofile_perf_suspend(struct platform_device *dev, pm_message_t state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) mutex_lock(&oprofile_perf_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (oprofile_perf_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) op_perf_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) mutex_unlock(&oprofile_perf_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static int oprofile_perf_resume(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) mutex_lock(&oprofile_perf_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (oprofile_perf_enabled && op_perf_start())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) oprofile_perf_enabled = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) mutex_unlock(&oprofile_perf_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static struct platform_driver oprofile_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) .name = "oprofile-perf",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) .resume = oprofile_perf_resume,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) .suspend = oprofile_perf_suspend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) static struct platform_device *oprofile_pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) static int __init init_driverfs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) ret = platform_driver_register(&oprofile_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) oprofile_pdev = platform_device_register_simple(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) oprofile_driver.driver.name, 0, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (IS_ERR(oprofile_pdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ret = PTR_ERR(oprofile_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) platform_driver_unregister(&oprofile_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static void exit_driverfs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) platform_device_unregister(oprofile_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) platform_driver_unregister(&oprofile_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static inline int init_driverfs(void) { return 0; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static inline void exit_driverfs(void) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) #endif /* CONFIG_PM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) void oprofile_perf_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) int cpu, id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) struct perf_event *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) for (id = 0; id < num_counters; ++id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) event = per_cpu(perf_events, cpu)[id];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) perf_event_release_kernel(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) kfree(per_cpu(perf_events, cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) kfree(counter_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) exit_driverfs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int __init oprofile_perf_init(struct oprofile_operations *ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) int cpu, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) ret = init_driverfs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) num_counters = perf_num_counters();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (num_counters <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) pr_info("oprofile: no performance counters\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) counter_config = kcalloc(num_counters,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) sizeof(struct op_counter_config), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (!counter_config) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) pr_info("oprofile: failed to allocate %d "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) "counters\n", num_counters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) num_counters = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) per_cpu(perf_events, cpu) = kcalloc(num_counters,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) sizeof(struct perf_event *), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (!per_cpu(perf_events, cpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) pr_info("oprofile: failed to allocate %d perf events "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) "for cpu %d\n", num_counters, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) ops->create_files = oprofile_perf_create_files;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) ops->setup = oprofile_perf_setup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) ops->start = oprofile_perf_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) ops->stop = oprofile_perf_stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) ops->shutdown = oprofile_perf_stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) ops->cpu_type = op_name_from_perf_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (!ops->cpu_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) pr_info("oprofile: using %s\n", ops->cpu_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) oprofile_perf_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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