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-rw-r--r--tools/perf/util/evsel.c2739
1 files changed, 2739 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
new file mode 100644
index 000000000..1a1cbd16d
--- /dev/null
+++ b/tools/perf/util/evsel.c
@@ -0,0 +1,2739 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
+ *
+ * Parts came from builtin-{top,stat,record}.c, see those files for further
+ * copyright notes.
+ */
+
+#include <byteswap.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <linux/bitops.h>
+#include <api/fs/fs.h>
+#include <api/fs/tracing_path.h>
+#include <traceevent/event-parse.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/perf_event.h>
+#include <linux/compiler.h>
+#include <linux/err.h>
+#include <linux/zalloc.h>
+#include <sys/ioctl.h>
+#include <sys/resource.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <perf/evsel.h>
+#include "asm/bug.h"
+#include "callchain.h"
+#include "cgroup.h"
+#include "counts.h"
+#include "event.h"
+#include "evsel.h"
+#include "util/env.h"
+#include "util/evsel_config.h"
+#include "util/evsel_fprintf.h"
+#include "evlist.h"
+#include <perf/cpumap.h>
+#include "thread_map.h"
+#include "target.h"
+#include "perf_regs.h"
+#include "record.h"
+#include "debug.h"
+#include "trace-event.h"
+#include "stat.h"
+#include "string2.h"
+#include "memswap.h"
+#include "util.h"
+#include "../perf-sys.h"
+#include "util/parse-branch-options.h"
+#include <internal/xyarray.h>
+#include <internal/lib.h>
+
+#include <linux/ctype.h>
+
+struct perf_missing_features perf_missing_features;
+
+static clockid_t clockid;
+
+static int evsel__no_extra_init(struct evsel *evsel __maybe_unused)
+{
+ return 0;
+}
+
+void __weak test_attr__ready(void) { }
+
+static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
+{
+}
+
+static struct {
+ size_t size;
+ int (*init)(struct evsel *evsel);
+ void (*fini)(struct evsel *evsel);
+} perf_evsel__object = {
+ .size = sizeof(struct evsel),
+ .init = evsel__no_extra_init,
+ .fini = evsel__no_extra_fini,
+};
+
+int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel),
+ void (*fini)(struct evsel *evsel))
+{
+
+ if (object_size == 0)
+ goto set_methods;
+
+ if (perf_evsel__object.size > object_size)
+ return -EINVAL;
+
+ perf_evsel__object.size = object_size;
+
+set_methods:
+ if (init != NULL)
+ perf_evsel__object.init = init;
+
+ if (fini != NULL)
+ perf_evsel__object.fini = fini;
+
+ return 0;
+}
+
+#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
+
+int __evsel__sample_size(u64 sample_type)
+{
+ u64 mask = sample_type & PERF_SAMPLE_MASK;
+ int size = 0;
+ int i;
+
+ for (i = 0; i < 64; i++) {
+ if (mask & (1ULL << i))
+ size++;
+ }
+
+ size *= sizeof(u64);
+
+ return size;
+}
+
+/**
+ * __perf_evsel__calc_id_pos - calculate id_pos.
+ * @sample_type: sample type
+ *
+ * This function returns the position of the event id (PERF_SAMPLE_ID or
+ * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
+ * perf_record_sample.
+ */
+static int __perf_evsel__calc_id_pos(u64 sample_type)
+{
+ int idx = 0;
+
+ if (sample_type & PERF_SAMPLE_IDENTIFIER)
+ return 0;
+
+ if (!(sample_type & PERF_SAMPLE_ID))
+ return -1;
+
+ if (sample_type & PERF_SAMPLE_IP)
+ idx += 1;
+
+ if (sample_type & PERF_SAMPLE_TID)
+ idx += 1;
+
+ if (sample_type & PERF_SAMPLE_TIME)
+ idx += 1;
+
+ if (sample_type & PERF_SAMPLE_ADDR)
+ idx += 1;
+
+ return idx;
+}
+
+/**
+ * __perf_evsel__calc_is_pos - calculate is_pos.
+ * @sample_type: sample type
+ *
+ * This function returns the position (counting backwards) of the event id
+ * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
+ * sample_id_all is used there is an id sample appended to non-sample events.
+ */
+static int __perf_evsel__calc_is_pos(u64 sample_type)
+{
+ int idx = 1;
+
+ if (sample_type & PERF_SAMPLE_IDENTIFIER)
+ return 1;
+
+ if (!(sample_type & PERF_SAMPLE_ID))
+ return -1;
+
+ if (sample_type & PERF_SAMPLE_CPU)
+ idx += 1;
+
+ if (sample_type & PERF_SAMPLE_STREAM_ID)
+ idx += 1;
+
+ return idx;
+}
+
+void evsel__calc_id_pos(struct evsel *evsel)
+{
+ evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
+ evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
+}
+
+void __evsel__set_sample_bit(struct evsel *evsel,
+ enum perf_event_sample_format bit)
+{
+ if (!(evsel->core.attr.sample_type & bit)) {
+ evsel->core.attr.sample_type |= bit;
+ evsel->sample_size += sizeof(u64);
+ evsel__calc_id_pos(evsel);
+ }
+}
+
+void __evsel__reset_sample_bit(struct evsel *evsel,
+ enum perf_event_sample_format bit)
+{
+ if (evsel->core.attr.sample_type & bit) {
+ evsel->core.attr.sample_type &= ~bit;
+ evsel->sample_size -= sizeof(u64);
+ evsel__calc_id_pos(evsel);
+ }
+}
+
+void evsel__set_sample_id(struct evsel *evsel,
+ bool can_sample_identifier)
+{
+ if (can_sample_identifier) {
+ evsel__reset_sample_bit(evsel, ID);
+ evsel__set_sample_bit(evsel, IDENTIFIER);
+ } else {
+ evsel__set_sample_bit(evsel, ID);
+ }
+ evsel->core.attr.read_format |= PERF_FORMAT_ID;
+}
+
+/**
+ * evsel__is_function_event - Return whether given evsel is a function
+ * trace event
+ *
+ * @evsel - evsel selector to be tested
+ *
+ * Return %true if event is function trace event
+ */
+bool evsel__is_function_event(struct evsel *evsel)
+{
+#define FUNCTION_EVENT "ftrace:function"
+
+ return evsel->name &&
+ !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
+
+#undef FUNCTION_EVENT
+}
+
+void evsel__init(struct evsel *evsel,
+ struct perf_event_attr *attr, int idx)
+{
+ perf_evsel__init(&evsel->core, attr);
+ evsel->idx = idx;
+ evsel->tracking = !idx;
+ evsel->leader = evsel;
+ evsel->unit = "";
+ evsel->scale = 1.0;
+ evsel->max_events = ULONG_MAX;
+ evsel->evlist = NULL;
+ evsel->bpf_obj = NULL;
+ evsel->bpf_fd = -1;
+ INIT_LIST_HEAD(&evsel->config_terms);
+ perf_evsel__object.init(evsel);
+ evsel->sample_size = __evsel__sample_size(attr->sample_type);
+ evsel__calc_id_pos(evsel);
+ evsel->cmdline_group_boundary = false;
+ evsel->metric_expr = NULL;
+ evsel->metric_name = NULL;
+ evsel->metric_events = NULL;
+ evsel->per_pkg_mask = NULL;
+ evsel->collect_stat = false;
+ evsel->pmu_name = NULL;
+}
+
+struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx)
+{
+ struct evsel *evsel = zalloc(perf_evsel__object.size);
+
+ if (!evsel)
+ return NULL;
+ evsel__init(evsel, attr, idx);
+
+ if (evsel__is_bpf_output(evsel)) {
+ evsel->core.attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
+ PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
+ evsel->core.attr.sample_period = 1;
+ }
+
+ if (evsel__is_clock(evsel)) {
+ /*
+ * The evsel->unit points to static alias->unit
+ * so it's ok to use static string in here.
+ */
+ static const char *unit = "msec";
+
+ evsel->unit = unit;
+ evsel->scale = 1e-6;
+ }
+
+ return evsel;
+}
+
+static bool perf_event_can_profile_kernel(void)
+{
+ return perf_event_paranoid_check(1);
+}
+
+struct evsel *evsel__new_cycles(bool precise)
+{
+ struct perf_event_attr attr = {
+ .type = PERF_TYPE_HARDWARE,
+ .config = PERF_COUNT_HW_CPU_CYCLES,
+ .exclude_kernel = !perf_event_can_profile_kernel(),
+ };
+ struct evsel *evsel;
+
+ event_attr_init(&attr);
+
+ if (!precise)
+ goto new_event;
+
+ /*
+ * Now let the usual logic to set up the perf_event_attr defaults
+ * to kick in when we return and before perf_evsel__open() is called.
+ */
+new_event:
+ evsel = evsel__new(&attr);
+ if (evsel == NULL)
+ goto out;
+
+ evsel->precise_max = true;
+
+ /* use asprintf() because free(evsel) assumes name is allocated */
+ if (asprintf(&evsel->name, "cycles%s%s%.*s",
+ (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
+ attr.exclude_kernel ? "u" : "",
+ attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
+ goto error_free;
+out:
+ return evsel;
+error_free:
+ evsel__delete(evsel);
+ evsel = NULL;
+ goto out;
+}
+
+static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src)
+{
+ struct evsel_config_term *pos, *tmp;
+
+ list_for_each_entry(pos, &src->config_terms, list) {
+ tmp = malloc(sizeof(*tmp));
+ if (tmp == NULL)
+ return -ENOMEM;
+
+ *tmp = *pos;
+ if (tmp->free_str) {
+ tmp->val.str = strdup(pos->val.str);
+ if (tmp->val.str == NULL) {
+ free(tmp);
+ return -ENOMEM;
+ }
+ }
+ list_add_tail(&tmp->list, &dst->config_terms);
+ }
+ return 0;
+}
+
+/**
+ * evsel__clone - create a new evsel copied from @orig
+ * @orig: original evsel
+ *
+ * The assumption is that @orig is not configured nor opened yet.
+ * So we only care about the attributes that can be set while it's parsed.
+ */
+struct evsel *evsel__clone(struct evsel *orig)
+{
+ struct evsel *evsel;
+
+ BUG_ON(orig->core.fd);
+ BUG_ON(orig->counts);
+ BUG_ON(orig->priv);
+ BUG_ON(orig->per_pkg_mask);
+
+ /* cannot handle BPF objects for now */
+ if (orig->bpf_obj)
+ return NULL;
+
+ evsel = evsel__new(&orig->core.attr);
+ if (evsel == NULL)
+ return NULL;
+
+ evsel->core.cpus = perf_cpu_map__get(orig->core.cpus);
+ evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus);
+ evsel->core.threads = perf_thread_map__get(orig->core.threads);
+ evsel->core.nr_members = orig->core.nr_members;
+ evsel->core.system_wide = orig->core.system_wide;
+
+ if (orig->name) {
+ evsel->name = strdup(orig->name);
+ if (evsel->name == NULL)
+ goto out_err;
+ }
+ if (orig->group_name) {
+ evsel->group_name = strdup(orig->group_name);
+ if (evsel->group_name == NULL)
+ goto out_err;
+ }
+ if (orig->pmu_name) {
+ evsel->pmu_name = strdup(orig->pmu_name);
+ if (evsel->pmu_name == NULL)
+ goto out_err;
+ }
+ if (orig->filter) {
+ evsel->filter = strdup(orig->filter);
+ if (evsel->filter == NULL)
+ goto out_err;
+ }
+ evsel->cgrp = cgroup__get(orig->cgrp);
+ evsel->tp_format = orig->tp_format;
+ evsel->handler = orig->handler;
+ evsel->leader = orig->leader;
+
+ evsel->max_events = orig->max_events;
+ evsel->tool_event = orig->tool_event;
+ evsel->unit = orig->unit;
+ evsel->scale = orig->scale;
+ evsel->snapshot = orig->snapshot;
+ evsel->per_pkg = orig->per_pkg;
+ evsel->percore = orig->percore;
+ evsel->precise_max = orig->precise_max;
+ evsel->use_uncore_alias = orig->use_uncore_alias;
+ evsel->is_libpfm_event = orig->is_libpfm_event;
+
+ evsel->exclude_GH = orig->exclude_GH;
+ evsel->sample_read = orig->sample_read;
+ evsel->auto_merge_stats = orig->auto_merge_stats;
+ evsel->collect_stat = orig->collect_stat;
+ evsel->weak_group = orig->weak_group;
+
+ if (evsel__copy_config_terms(evsel, orig) < 0)
+ goto out_err;
+
+ return evsel;
+
+out_err:
+ evsel__delete(evsel);
+ return NULL;
+}
+
+/*
+ * Returns pointer with encoded error via <linux/err.h> interface.
+ */
+struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx)
+{
+ struct evsel *evsel = zalloc(perf_evsel__object.size);
+ int err = -ENOMEM;
+
+ if (evsel == NULL) {
+ goto out_err;
+ } else {
+ struct perf_event_attr attr = {
+ .type = PERF_TYPE_TRACEPOINT,
+ .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
+ PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
+ };
+
+ if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
+ goto out_free;
+
+ evsel->tp_format = trace_event__tp_format(sys, name);
+ if (IS_ERR(evsel->tp_format)) {
+ err = PTR_ERR(evsel->tp_format);
+ goto out_free;
+ }
+
+ event_attr_init(&attr);
+ attr.config = evsel->tp_format->id;
+ attr.sample_period = 1;
+ evsel__init(evsel, &attr, idx);
+ }
+
+ return evsel;
+
+out_free:
+ zfree(&evsel->name);
+ free(evsel);
+out_err:
+ return ERR_PTR(err);
+}
+
+const char *evsel__hw_names[PERF_COUNT_HW_MAX] = {
+ "cycles",
+ "instructions",
+ "cache-references",
+ "cache-misses",
+ "branches",
+ "branch-misses",
+ "bus-cycles",
+ "stalled-cycles-frontend",
+ "stalled-cycles-backend",
+ "ref-cycles",
+};
+
+static const char *__evsel__hw_name(u64 config)
+{
+ if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config])
+ return evsel__hw_names[config];
+
+ return "unknown-hardware";
+}
+
+static int perf_evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
+{
+ int colon = 0, r = 0;
+ struct perf_event_attr *attr = &evsel->core.attr;
+ bool exclude_guest_default = false;
+
+#define MOD_PRINT(context, mod) do { \
+ if (!attr->exclude_##context) { \
+ if (!colon) colon = ++r; \
+ r += scnprintf(bf + r, size - r, "%c", mod); \
+ } } while(0)
+
+ if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
+ MOD_PRINT(kernel, 'k');
+ MOD_PRINT(user, 'u');
+ MOD_PRINT(hv, 'h');
+ exclude_guest_default = true;
+ }
+
+ if (attr->precise_ip) {
+ if (!colon)
+ colon = ++r;
+ r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
+ exclude_guest_default = true;
+ }
+
+ if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
+ MOD_PRINT(host, 'H');
+ MOD_PRINT(guest, 'G');
+ }
+#undef MOD_PRINT
+ if (colon)
+ bf[colon - 1] = ':';
+ return r;
+}
+
+static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
+{
+ int r = scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config));
+ return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
+}
+
+const char *evsel__sw_names[PERF_COUNT_SW_MAX] = {
+ "cpu-clock",
+ "task-clock",
+ "page-faults",
+ "context-switches",
+ "cpu-migrations",
+ "minor-faults",
+ "major-faults",
+ "alignment-faults",
+ "emulation-faults",
+ "dummy",
+};
+
+static const char *__evsel__sw_name(u64 config)
+{
+ if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config])
+ return evsel__sw_names[config];
+ return "unknown-software";
+}
+
+static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
+{
+ int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config));
+ return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
+}
+
+static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
+{
+ int r;
+
+ r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
+
+ if (type & HW_BREAKPOINT_R)
+ r += scnprintf(bf + r, size - r, "r");
+
+ if (type & HW_BREAKPOINT_W)
+ r += scnprintf(bf + r, size - r, "w");
+
+ if (type & HW_BREAKPOINT_X)
+ r += scnprintf(bf + r, size - r, "x");
+
+ return r;
+}
+
+static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
+{
+ struct perf_event_attr *attr = &evsel->core.attr;
+ int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
+ return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
+}
+
+const char *evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = {
+ { "L1-dcache", "l1-d", "l1d", "L1-data", },
+ { "L1-icache", "l1-i", "l1i", "L1-instruction", },
+ { "LLC", "L2", },
+ { "dTLB", "d-tlb", "Data-TLB", },
+ { "iTLB", "i-tlb", "Instruction-TLB", },
+ { "branch", "branches", "bpu", "btb", "bpc", },
+ { "node", },
+};
+
+const char *evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = {
+ { "load", "loads", "read", },
+ { "store", "stores", "write", },
+ { "prefetch", "prefetches", "speculative-read", "speculative-load", },
+};
+
+const char *evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = {
+ { "refs", "Reference", "ops", "access", },
+ { "misses", "miss", },
+};
+
+#define C(x) PERF_COUNT_HW_CACHE_##x
+#define CACHE_READ (1 << C(OP_READ))
+#define CACHE_WRITE (1 << C(OP_WRITE))
+#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
+#define COP(x) (1 << x)
+
+/*
+ * cache operartion stat
+ * L1I : Read and prefetch only
+ * ITLB and BPU : Read-only
+ */
+static unsigned long evsel__hw_cache_stat[C(MAX)] = {
+ [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+ [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
+ [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+ [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+ [C(ITLB)] = (CACHE_READ),
+ [C(BPU)] = (CACHE_READ),
+ [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+};
+
+bool evsel__is_cache_op_valid(u8 type, u8 op)
+{
+ if (evsel__hw_cache_stat[type] & COP(op))
+ return true; /* valid */
+ else
+ return false; /* invalid */
+}
+
+int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size)
+{
+ if (result) {
+ return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0],
+ evsel__hw_cache_op[op][0],
+ evsel__hw_cache_result[result][0]);
+ }
+
+ return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0],
+ evsel__hw_cache_op[op][1]);
+}
+
+static int __evsel__hw_cache_name(u64 config, char *bf, size_t size)
+{
+ u8 op, result, type = (config >> 0) & 0xff;
+ const char *err = "unknown-ext-hardware-cache-type";
+
+ if (type >= PERF_COUNT_HW_CACHE_MAX)
+ goto out_err;
+
+ op = (config >> 8) & 0xff;
+ err = "unknown-ext-hardware-cache-op";
+ if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
+ goto out_err;
+
+ result = (config >> 16) & 0xff;
+ err = "unknown-ext-hardware-cache-result";
+ if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
+ goto out_err;
+
+ err = "invalid-cache";
+ if (!evsel__is_cache_op_valid(type, op))
+ goto out_err;
+
+ return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
+out_err:
+ return scnprintf(bf, size, "%s", err);
+}
+
+static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
+{
+ int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size);
+ return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
+}
+
+static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
+{
+ int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
+ return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
+}
+
+static int evsel__tool_name(char *bf, size_t size)
+{
+ int ret = scnprintf(bf, size, "duration_time");
+ return ret;
+}
+
+const char *evsel__name(struct evsel *evsel)
+{
+ char bf[128];
+
+ if (!evsel)
+ goto out_unknown;
+
+ if (evsel->name)
+ return evsel->name;
+
+ switch (evsel->core.attr.type) {
+ case PERF_TYPE_RAW:
+ evsel__raw_name(evsel, bf, sizeof(bf));
+ break;
+
+ case PERF_TYPE_HARDWARE:
+ evsel__hw_name(evsel, bf, sizeof(bf));
+ break;
+
+ case PERF_TYPE_HW_CACHE:
+ evsel__hw_cache_name(evsel, bf, sizeof(bf));
+ break;
+
+ case PERF_TYPE_SOFTWARE:
+ if (evsel->tool_event)
+ evsel__tool_name(bf, sizeof(bf));
+ else
+ evsel__sw_name(evsel, bf, sizeof(bf));
+ break;
+
+ case PERF_TYPE_TRACEPOINT:
+ scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
+ break;
+
+ case PERF_TYPE_BREAKPOINT:
+ evsel__bp_name(evsel, bf, sizeof(bf));
+ break;
+
+ default:
+ scnprintf(bf, sizeof(bf), "unknown attr type: %d",
+ evsel->core.attr.type);
+ break;
+ }
+
+ evsel->name = strdup(bf);
+
+ if (evsel->name)
+ return evsel->name;
+out_unknown:
+ return "unknown";
+}
+
+const char *evsel__group_name(struct evsel *evsel)
+{
+ return evsel->group_name ?: "anon group";
+}
+
+/*
+ * Returns the group details for the specified leader,
+ * with following rules.
+ *
+ * For record -e '{cycles,instructions}'
+ * 'anon group { cycles:u, instructions:u }'
+ *
+ * For record -e 'cycles,instructions' and report --group
+ * 'cycles:u, instructions:u'
+ */
+int evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
+{
+ int ret = 0;
+ struct evsel *pos;
+ const char *group_name = evsel__group_name(evsel);
+
+ if (!evsel->forced_leader)
+ ret = scnprintf(buf, size, "%s { ", group_name);
+
+ ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel));
+
+ for_each_group_member(pos, evsel)
+ ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos));
+
+ if (!evsel->forced_leader)
+ ret += scnprintf(buf + ret, size - ret, " }");
+
+ return ret;
+}
+
+static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
+ struct callchain_param *param)
+{
+ bool function = evsel__is_function_event(evsel);
+ struct perf_event_attr *attr = &evsel->core.attr;
+
+ evsel__set_sample_bit(evsel, CALLCHAIN);
+
+ attr->sample_max_stack = param->max_stack;
+
+ if (opts->kernel_callchains)
+ attr->exclude_callchain_user = 1;
+ if (opts->user_callchains)
+ attr->exclude_callchain_kernel = 1;
+ if (param->record_mode == CALLCHAIN_LBR) {
+ if (!opts->branch_stack) {
+ if (attr->exclude_user) {
+ pr_warning("LBR callstack option is only available "
+ "to get user callchain information. "
+ "Falling back to framepointers.\n");
+ } else {
+ evsel__set_sample_bit(evsel, BRANCH_STACK);
+ attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
+ PERF_SAMPLE_BRANCH_CALL_STACK |
+ PERF_SAMPLE_BRANCH_NO_CYCLES |
+ PERF_SAMPLE_BRANCH_NO_FLAGS |
+ PERF_SAMPLE_BRANCH_HW_INDEX;
+ }
+ } else
+ pr_warning("Cannot use LBR callstack with branch stack. "
+ "Falling back to framepointers.\n");
+ }
+
+ if (param->record_mode == CALLCHAIN_DWARF) {
+ if (!function) {
+ evsel__set_sample_bit(evsel, REGS_USER);
+ evsel__set_sample_bit(evsel, STACK_USER);
+ if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) {
+ attr->sample_regs_user |= DWARF_MINIMAL_REGS;
+ pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
+ "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
+ "so the minimal registers set (IP, SP) is explicitly forced.\n");
+ } else {
+ attr->sample_regs_user |= PERF_REGS_MASK;
+ }
+ attr->sample_stack_user = param->dump_size;
+ attr->exclude_callchain_user = 1;
+ } else {
+ pr_info("Cannot use DWARF unwind for function trace event,"
+ " falling back to framepointers.\n");
+ }
+ }
+
+ if (function) {
+ pr_info("Disabling user space callchains for function trace event.\n");
+ attr->exclude_callchain_user = 1;
+ }
+}
+
+void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
+ struct callchain_param *param)
+{
+ if (param->enabled)
+ return __evsel__config_callchain(evsel, opts, param);
+}
+
+static void
+perf_evsel__reset_callgraph(struct evsel *evsel,
+ struct callchain_param *param)
+{
+ struct perf_event_attr *attr = &evsel->core.attr;
+
+ evsel__reset_sample_bit(evsel, CALLCHAIN);
+ if (param->record_mode == CALLCHAIN_LBR) {
+ evsel__reset_sample_bit(evsel, BRANCH_STACK);
+ attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
+ PERF_SAMPLE_BRANCH_CALL_STACK |
+ PERF_SAMPLE_BRANCH_HW_INDEX);
+ }
+ if (param->record_mode == CALLCHAIN_DWARF) {
+ evsel__reset_sample_bit(evsel, REGS_USER);
+ evsel__reset_sample_bit(evsel, STACK_USER);
+ }
+}
+
+static void evsel__apply_config_terms(struct evsel *evsel,
+ struct record_opts *opts, bool track)
+{
+ struct evsel_config_term *term;
+ struct list_head *config_terms = &evsel->config_terms;
+ struct perf_event_attr *attr = &evsel->core.attr;
+ /* callgraph default */
+ struct callchain_param param = {
+ .record_mode = callchain_param.record_mode,
+ };
+ u32 dump_size = 0;
+ int max_stack = 0;
+ const char *callgraph_buf = NULL;
+
+ list_for_each_entry(term, config_terms, list) {
+ switch (term->type) {
+ case EVSEL__CONFIG_TERM_PERIOD:
+ if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
+ attr->sample_period = term->val.period;
+ attr->freq = 0;
+ evsel__reset_sample_bit(evsel, PERIOD);
+ }
+ break;
+ case EVSEL__CONFIG_TERM_FREQ:
+ if (!(term->weak && opts->user_freq != UINT_MAX)) {
+ attr->sample_freq = term->val.freq;
+ attr->freq = 1;
+ evsel__set_sample_bit(evsel, PERIOD);
+ }
+ break;
+ case EVSEL__CONFIG_TERM_TIME:
+ if (term->val.time)
+ evsel__set_sample_bit(evsel, TIME);
+ else
+ evsel__reset_sample_bit(evsel, TIME);
+ break;
+ case EVSEL__CONFIG_TERM_CALLGRAPH:
+ callgraph_buf = term->val.str;
+ break;
+ case EVSEL__CONFIG_TERM_BRANCH:
+ if (term->val.str && strcmp(term->val.str, "no")) {
+ evsel__set_sample_bit(evsel, BRANCH_STACK);
+ parse_branch_str(term->val.str,
+ &attr->branch_sample_type);
+ } else
+ evsel__reset_sample_bit(evsel, BRANCH_STACK);
+ break;
+ case EVSEL__CONFIG_TERM_STACK_USER:
+ dump_size = term->val.stack_user;
+ break;
+ case EVSEL__CONFIG_TERM_MAX_STACK:
+ max_stack = term->val.max_stack;
+ break;
+ case EVSEL__CONFIG_TERM_MAX_EVENTS:
+ evsel->max_events = term->val.max_events;
+ break;
+ case EVSEL__CONFIG_TERM_INHERIT:
+ /*
+ * attr->inherit should has already been set by
+ * evsel__config. If user explicitly set
+ * inherit using config terms, override global
+ * opt->no_inherit setting.
+ */
+ attr->inherit = term->val.inherit ? 1 : 0;
+ break;
+ case EVSEL__CONFIG_TERM_OVERWRITE:
+ attr->write_backward = term->val.overwrite ? 1 : 0;
+ break;
+ case EVSEL__CONFIG_TERM_DRV_CFG:
+ break;
+ case EVSEL__CONFIG_TERM_PERCORE:
+ break;
+ case EVSEL__CONFIG_TERM_AUX_OUTPUT:
+ attr->aux_output = term->val.aux_output ? 1 : 0;
+ break;
+ case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
+ /* Already applied by auxtrace */
+ break;
+ case EVSEL__CONFIG_TERM_CFG_CHG:
+ break;
+ default:
+ break;
+ }
+ }
+
+ /* User explicitly set per-event callgraph, clear the old setting and reset. */
+ if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
+ bool sample_address = false;
+
+ if (max_stack) {
+ param.max_stack = max_stack;
+ if (callgraph_buf == NULL)
+ callgraph_buf = "fp";
+ }
+
+ /* parse callgraph parameters */
+ if (callgraph_buf != NULL) {
+ if (!strcmp(callgraph_buf, "no")) {
+ param.enabled = false;
+ param.record_mode = CALLCHAIN_NONE;
+ } else {
+ param.enabled = true;
+ if (parse_callchain_record(callgraph_buf, &param)) {
+ pr_err("per-event callgraph setting for %s failed. "
+ "Apply callgraph global setting for it\n",
+ evsel->name);
+ return;
+ }
+ if (param.record_mode == CALLCHAIN_DWARF)
+ sample_address = true;
+ }
+ }
+ if (dump_size > 0) {
+ dump_size = round_up(dump_size, sizeof(u64));
+ param.dump_size = dump_size;
+ }
+
+ /* If global callgraph set, clear it */
+ if (callchain_param.enabled)
+ perf_evsel__reset_callgraph(evsel, &callchain_param);
+
+ /* set perf-event callgraph */
+ if (param.enabled) {
+ if (sample_address) {
+ evsel__set_sample_bit(evsel, ADDR);
+ evsel__set_sample_bit(evsel, DATA_SRC);
+ evsel->core.attr.mmap_data = track;
+ }
+ evsel__config_callchain(evsel, opts, &param);
+ }
+ }
+}
+
+struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type)
+{
+ struct evsel_config_term *term, *found_term = NULL;
+
+ list_for_each_entry(term, &evsel->config_terms, list) {
+ if (term->type == type)
+ found_term = term;
+ }
+
+ return found_term;
+}
+
+static void evsel__set_default_freq_period(struct record_opts *opts,
+ struct perf_event_attr *attr)
+{
+ if (opts->freq) {
+ attr->freq = 1;
+ attr->sample_freq = opts->freq;
+ } else {
+ attr->sample_period = opts->default_interval;
+ }
+}
+
+/*
+ * The enable_on_exec/disabled value strategy:
+ *
+ * 1) For any type of traced program:
+ * - all independent events and group leaders are disabled
+ * - all group members are enabled
+ *
+ * Group members are ruled by group leaders. They need to
+ * be enabled, because the group scheduling relies on that.
+ *
+ * 2) For traced programs executed by perf:
+ * - all independent events and group leaders have
+ * enable_on_exec set
+ * - we don't specifically enable or disable any event during
+ * the record command
+ *
+ * Independent events and group leaders are initially disabled
+ * and get enabled by exec. Group members are ruled by group
+ * leaders as stated in 1).
+ *
+ * 3) For traced programs attached by perf (pid/tid):
+ * - we specifically enable or disable all events during
+ * the record command
+ *
+ * When attaching events to already running traced we
+ * enable/disable events specifically, as there's no
+ * initial traced exec call.
+ */
+void evsel__config(struct evsel *evsel, struct record_opts *opts,
+ struct callchain_param *callchain)
+{
+ struct evsel *leader = evsel->leader;
+ struct perf_event_attr *attr = &evsel->core.attr;
+ int track = evsel->tracking;
+ bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
+
+ attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
+ attr->inherit = !opts->no_inherit;
+ attr->write_backward = opts->overwrite ? 1 : 0;
+
+ evsel__set_sample_bit(evsel, IP);
+ evsel__set_sample_bit(evsel, TID);
+
+ if (evsel->sample_read) {
+ evsel__set_sample_bit(evsel, READ);
+
+ /*
+ * We need ID even in case of single event, because
+ * PERF_SAMPLE_READ process ID specific data.
+ */
+ evsel__set_sample_id(evsel, false);
+
+ /*
+ * Apply group format only if we belong to group
+ * with more than one members.
+ */
+ if (leader->core.nr_members > 1) {
+ attr->read_format |= PERF_FORMAT_GROUP;
+ attr->inherit = 0;
+ }
+ }
+
+ /*
+ * We default some events to have a default interval. But keep
+ * it a weak assumption overridable by the user.
+ */
+ if ((evsel->is_libpfm_event && !attr->sample_period) ||
+ (!evsel->is_libpfm_event && (!attr->sample_period ||
+ opts->user_freq != UINT_MAX ||
+ opts->user_interval != ULLONG_MAX)))
+ evsel__set_default_freq_period(opts, attr);
+
+ /*
+ * If attr->freq was set (here or earlier), ask for period
+ * to be sampled.
+ */
+ if (attr->freq)
+ evsel__set_sample_bit(evsel, PERIOD);
+
+ if (opts->no_samples)
+ attr->sample_freq = 0;
+
+ if (opts->inherit_stat) {
+ evsel->core.attr.read_format |=
+ PERF_FORMAT_TOTAL_TIME_ENABLED |
+ PERF_FORMAT_TOTAL_TIME_RUNNING |
+ PERF_FORMAT_ID;
+ attr->inherit_stat = 1;
+ }
+
+ if (opts->sample_address) {
+ evsel__set_sample_bit(evsel, ADDR);
+ attr->mmap_data = track;
+ }
+
+ /*
+ * We don't allow user space callchains for function trace
+ * event, due to issues with page faults while tracing page
+ * fault handler and its overall trickiness nature.
+ */
+ if (evsel__is_function_event(evsel))
+ evsel->core.attr.exclude_callchain_user = 1;
+
+ if (callchain && callchain->enabled && !evsel->no_aux_samples)
+ evsel__config_callchain(evsel, opts, callchain);
+
+ if (opts->sample_intr_regs && !evsel->no_aux_samples &&
+ !evsel__is_dummy_event(evsel)) {
+ attr->sample_regs_intr = opts->sample_intr_regs;
+ evsel__set_sample_bit(evsel, REGS_INTR);
+ }
+
+ if (opts->sample_user_regs && !evsel->no_aux_samples &&
+ !evsel__is_dummy_event(evsel)) {
+ attr->sample_regs_user |= opts->sample_user_regs;
+ evsel__set_sample_bit(evsel, REGS_USER);
+ }
+
+ if (target__has_cpu(&opts->target) || opts->sample_cpu)
+ evsel__set_sample_bit(evsel, CPU);
+
+ /*
+ * When the user explicitly disabled time don't force it here.
+ */
+ if (opts->sample_time &&
+ (!perf_missing_features.sample_id_all &&
+ (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
+ opts->sample_time_set)))
+ evsel__set_sample_bit(evsel, TIME);
+
+ if (opts->raw_samples && !evsel->no_aux_samples) {
+ evsel__set_sample_bit(evsel, TIME);
+ evsel__set_sample_bit(evsel, RAW);
+ evsel__set_sample_bit(evsel, CPU);
+ }
+
+ if (opts->sample_address)
+ evsel__set_sample_bit(evsel, DATA_SRC);
+
+ if (opts->sample_phys_addr)
+ evsel__set_sample_bit(evsel, PHYS_ADDR);
+
+ if (opts->no_buffering) {
+ attr->watermark = 0;
+ attr->wakeup_events = 1;
+ }
+ if (opts->branch_stack && !evsel->no_aux_samples) {
+ evsel__set_sample_bit(evsel, BRANCH_STACK);
+ attr->branch_sample_type = opts->branch_stack;
+ }
+
+ if (opts->sample_weight)
+ evsel__set_sample_bit(evsel, WEIGHT);
+
+ attr->task = track;
+ attr->mmap = track;
+ attr->mmap2 = track && !perf_missing_features.mmap2;
+ attr->comm = track;
+ /*
+ * ksymbol is tracked separately with text poke because it needs to be
+ * system wide and enabled immediately.
+ */
+ if (!opts->text_poke)
+ attr->ksymbol = track && !perf_missing_features.ksymbol;
+ attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
+
+ if (opts->record_namespaces)
+ attr->namespaces = track;
+
+ if (opts->record_cgroup) {
+ attr->cgroup = track && !perf_missing_features.cgroup;
+ evsel__set_sample_bit(evsel, CGROUP);
+ }
+
+ if (opts->record_switch_events)
+ attr->context_switch = track;
+
+ if (opts->sample_transaction)
+ evsel__set_sample_bit(evsel, TRANSACTION);
+
+ if (opts->running_time) {
+ evsel->core.attr.read_format |=
+ PERF_FORMAT_TOTAL_TIME_ENABLED |
+ PERF_FORMAT_TOTAL_TIME_RUNNING;
+ }
+
+ /*
+ * XXX see the function comment above
+ *
+ * Disabling only independent events or group leaders,
+ * keeping group members enabled.
+ */
+ if (evsel__is_group_leader(evsel))
+ attr->disabled = 1;
+
+ /*
+ * Setting enable_on_exec for independent events and
+ * group leaders for traced executed by perf.
+ */
+ if (target__none(&opts->target) && evsel__is_group_leader(evsel) &&
+ !opts->initial_delay)
+ attr->enable_on_exec = 1;
+
+ if (evsel->immediate) {
+ attr->disabled = 0;
+ attr->enable_on_exec = 0;
+ }
+
+ clockid = opts->clockid;
+ if (opts->use_clockid) {
+ attr->use_clockid = 1;
+ attr->clockid = opts->clockid;
+ }
+
+ if (evsel->precise_max)
+ attr->precise_ip = 3;
+
+ if (opts->all_user) {
+ attr->exclude_kernel = 1;
+ attr->exclude_user = 0;
+ }
+
+ if (opts->all_kernel) {
+ attr->exclude_kernel = 0;
+ attr->exclude_user = 1;
+ }
+
+ if (evsel->core.own_cpus || evsel->unit)
+ evsel->core.attr.read_format |= PERF_FORMAT_ID;
+
+ /*
+ * Apply event specific term settings,
+ * it overloads any global configuration.
+ */
+ evsel__apply_config_terms(evsel, opts, track);
+
+ evsel->ignore_missing_thread = opts->ignore_missing_thread;
+
+ /* The --period option takes the precedence. */
+ if (opts->period_set) {
+ if (opts->period)
+ evsel__set_sample_bit(evsel, PERIOD);
+ else
+ evsel__reset_sample_bit(evsel, PERIOD);
+ }
+
+ /*
+ * A dummy event never triggers any actual counter and therefore
+ * cannot be used with branch_stack.
+ *
+ * For initial_delay, a dummy event is added implicitly.
+ * The software event will trigger -EOPNOTSUPP error out,
+ * if BRANCH_STACK bit is set.
+ */
+ if (evsel__is_dummy_event(evsel))
+ evsel__reset_sample_bit(evsel, BRANCH_STACK);
+}
+
+int evsel__set_filter(struct evsel *evsel, const char *filter)
+{
+ char *new_filter = strdup(filter);
+
+ if (new_filter != NULL) {
+ free(evsel->filter);
+ evsel->filter = new_filter;
+ return 0;
+ }
+
+ return -1;
+}
+
+static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter)
+{
+ char *new_filter;
+
+ if (evsel->filter == NULL)
+ return evsel__set_filter(evsel, filter);
+
+ if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
+ free(evsel->filter);
+ evsel->filter = new_filter;
+ return 0;
+ }
+
+ return -1;
+}
+
+int evsel__append_tp_filter(struct evsel *evsel, const char *filter)
+{
+ return evsel__append_filter(evsel, "(%s) && (%s)", filter);
+}
+
+int evsel__append_addr_filter(struct evsel *evsel, const char *filter)
+{
+ return evsel__append_filter(evsel, "%s,%s", filter);
+}
+
+/* Caller has to clear disabled after going through all CPUs. */
+int evsel__enable_cpu(struct evsel *evsel, int cpu)
+{
+ return perf_evsel__enable_cpu(&evsel->core, cpu);
+}
+
+int evsel__enable(struct evsel *evsel)
+{
+ int err = perf_evsel__enable(&evsel->core);
+
+ if (!err)
+ evsel->disabled = false;
+ return err;
+}
+
+/* Caller has to set disabled after going through all CPUs. */
+int evsel__disable_cpu(struct evsel *evsel, int cpu)
+{
+ return perf_evsel__disable_cpu(&evsel->core, cpu);
+}
+
+int evsel__disable(struct evsel *evsel)
+{
+ int err = perf_evsel__disable(&evsel->core);
+ /*
+ * We mark it disabled here so that tools that disable a event can
+ * ignore events after they disable it. I.e. the ring buffer may have
+ * already a few more events queued up before the kernel got the stop
+ * request.
+ */
+ if (!err)
+ evsel->disabled = true;
+
+ return err;
+}
+
+static void evsel__free_config_terms(struct evsel *evsel)
+{
+ struct evsel_config_term *term, *h;
+
+ list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
+ list_del_init(&term->list);
+ if (term->free_str)
+ zfree(&term->val.str);
+ free(term);
+ }
+}
+
+void evsel__exit(struct evsel *evsel)
+{
+ assert(list_empty(&evsel->core.node));
+ assert(evsel->evlist == NULL);
+ evsel__free_counts(evsel);
+ perf_evsel__free_fd(&evsel->core);
+ perf_evsel__free_id(&evsel->core);
+ evsel__free_config_terms(evsel);
+ cgroup__put(evsel->cgrp);
+ perf_cpu_map__put(evsel->core.cpus);
+ perf_cpu_map__put(evsel->core.own_cpus);
+ perf_thread_map__put(evsel->core.threads);
+ zfree(&evsel->group_name);
+ zfree(&evsel->name);
+ zfree(&evsel->pmu_name);
+ zfree(&evsel->per_pkg_mask);
+ zfree(&evsel->metric_events);
+ perf_evsel__object.fini(evsel);
+}
+
+void evsel__delete(struct evsel *evsel)
+{
+ evsel__exit(evsel);
+ free(evsel);
+}
+
+void evsel__compute_deltas(struct evsel *evsel, int cpu, int thread,
+ struct perf_counts_values *count)
+{
+ struct perf_counts_values tmp;
+
+ if (!evsel->prev_raw_counts)
+ return;
+
+ if (cpu == -1) {
+ tmp = evsel->prev_raw_counts->aggr;
+ evsel->prev_raw_counts->aggr = *count;
+ } else {
+ tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
+ *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
+ }
+
+ count->val = count->val - tmp.val;
+ count->ena = count->ena - tmp.ena;
+ count->run = count->run - tmp.run;
+}
+
+void perf_counts_values__scale(struct perf_counts_values *count,
+ bool scale, s8 *pscaled)
+{
+ s8 scaled = 0;
+
+ if (scale) {
+ if (count->run == 0) {
+ scaled = -1;
+ count->val = 0;
+ } else if (count->run < count->ena) {
+ scaled = 1;
+ count->val = (u64)((double) count->val * count->ena / count->run);
+ }
+ }
+
+ if (pscaled)
+ *pscaled = scaled;
+}
+
+static int evsel__read_one(struct evsel *evsel, int cpu, int thread)
+{
+ struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
+
+ return perf_evsel__read(&evsel->core, cpu, thread, count);
+}
+
+static void
+perf_evsel__set_count(struct evsel *counter, int cpu, int thread,
+ u64 val, u64 ena, u64 run)
+{
+ struct perf_counts_values *count;
+
+ count = perf_counts(counter->counts, cpu, thread);
+
+ count->val = val;
+ count->ena = ena;
+ count->run = run;
+
+ perf_counts__set_loaded(counter->counts, cpu, thread, true);
+}
+
+static int
+perf_evsel__process_group_data(struct evsel *leader,
+ int cpu, int thread, u64 *data)
+{
+ u64 read_format = leader->core.attr.read_format;
+ struct sample_read_value *v;
+ u64 nr, ena = 0, run = 0, i;
+
+ nr = *data++;
+
+ if (nr != (u64) leader->core.nr_members)
+ return -EINVAL;
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+ ena = *data++;
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+ run = *data++;
+
+ v = (struct sample_read_value *) data;
+
+ perf_evsel__set_count(leader, cpu, thread,
+ v[0].value, ena, run);
+
+ for (i = 1; i < nr; i++) {
+ struct evsel *counter;
+
+ counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
+ if (!counter)
+ return -EINVAL;
+
+ perf_evsel__set_count(counter, cpu, thread,
+ v[i].value, ena, run);
+ }
+
+ return 0;
+}
+
+static int evsel__read_group(struct evsel *leader, int cpu, int thread)
+{
+ struct perf_stat_evsel *ps = leader->stats;
+ u64 read_format = leader->core.attr.read_format;
+ int size = perf_evsel__read_size(&leader->core);
+ u64 *data = ps->group_data;
+
+ if (!(read_format & PERF_FORMAT_ID))
+ return -EINVAL;
+
+ if (!evsel__is_group_leader(leader))
+ return -EINVAL;
+
+ if (!data) {
+ data = zalloc(size);
+ if (!data)
+ return -ENOMEM;
+
+ ps->group_data = data;
+ }
+
+ if (FD(leader, cpu, thread) < 0)
+ return -EINVAL;
+
+ if (readn(FD(leader, cpu, thread), data, size) <= 0)
+ return -errno;
+
+ return perf_evsel__process_group_data(leader, cpu, thread, data);
+}
+
+int evsel__read_counter(struct evsel *evsel, int cpu, int thread)
+{
+ u64 read_format = evsel->core.attr.read_format;
+
+ if (read_format & PERF_FORMAT_GROUP)
+ return evsel__read_group(evsel, cpu, thread);
+
+ return evsel__read_one(evsel, cpu, thread);
+}
+
+int __evsel__read_on_cpu(struct evsel *evsel, int cpu, int thread, bool scale)
+{
+ struct perf_counts_values count;
+ size_t nv = scale ? 3 : 1;
+
+ if (FD(evsel, cpu, thread) < 0)
+ return -EINVAL;
+
+ if (evsel->counts == NULL && evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
+ return -ENOMEM;
+
+ if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
+ return -errno;
+
+ evsel__compute_deltas(evsel, cpu, thread, &count);
+ perf_counts_values__scale(&count, scale, NULL);
+ *perf_counts(evsel->counts, cpu, thread) = count;
+ return 0;
+}
+
+static int get_group_fd(struct evsel *evsel, int cpu, int thread)
+{
+ struct evsel *leader = evsel->leader;
+ int fd;
+
+ if (evsel__is_group_leader(evsel))
+ return -1;
+
+ /*
+ * Leader must be already processed/open,
+ * if not it's a bug.
+ */
+ BUG_ON(!leader->core.fd);
+
+ fd = FD(leader, cpu, thread);
+ BUG_ON(fd == -1);
+
+ return fd;
+}
+
+static void perf_evsel__remove_fd(struct evsel *pos,
+ int nr_cpus, int nr_threads,
+ int thread_idx)
+{
+ for (int cpu = 0; cpu < nr_cpus; cpu++)
+ for (int thread = thread_idx; thread < nr_threads - 1; thread++)
+ FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
+}
+
+static int update_fds(struct evsel *evsel,
+ int nr_cpus, int cpu_idx,
+ int nr_threads, int thread_idx)
+{
+ struct evsel *pos;
+
+ if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
+ return -EINVAL;
+
+ evlist__for_each_entry(evsel->evlist, pos) {
+ nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
+
+ perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
+
+ /*
+ * Since fds for next evsel has not been created,
+ * there is no need to iterate whole event list.
+ */
+ if (pos == evsel)
+ break;
+ }
+ return 0;
+}
+
+static bool ignore_missing_thread(struct evsel *evsel,
+ int nr_cpus, int cpu,
+ struct perf_thread_map *threads,
+ int thread, int err)
+{
+ pid_t ignore_pid = perf_thread_map__pid(threads, thread);
+
+ if (!evsel->ignore_missing_thread)
+ return false;
+
+ /* The system wide setup does not work with threads. */
+ if (evsel->core.system_wide)
+ return false;
+
+ /* The -ESRCH is perf event syscall errno for pid's not found. */
+ if (err != -ESRCH)
+ return false;
+
+ /* If there's only one thread, let it fail. */
+ if (threads->nr == 1)
+ return false;
+
+ /*
+ * We should remove fd for missing_thread first
+ * because thread_map__remove() will decrease threads->nr.
+ */
+ if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
+ return false;
+
+ if (thread_map__remove(threads, thread))
+ return false;
+
+ pr_warning("WARNING: Ignored open failure for pid %d\n",
+ ignore_pid);
+ return true;
+}
+
+static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
+ void *priv __maybe_unused)
+{
+ return fprintf(fp, " %-32s %s\n", name, val);
+}
+
+static void display_attr(struct perf_event_attr *attr)
+{
+ if (verbose >= 2 || debug_peo_args) {
+ fprintf(stderr, "%.60s\n", graph_dotted_line);
+ fprintf(stderr, "perf_event_attr:\n");
+ perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
+ fprintf(stderr, "%.60s\n", graph_dotted_line);
+ }
+}
+
+static int perf_event_open(struct evsel *evsel,
+ pid_t pid, int cpu, int group_fd,
+ unsigned long flags)
+{
+ int precise_ip = evsel->core.attr.precise_ip;
+ int fd;
+
+ while (1) {
+ pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
+ pid, cpu, group_fd, flags);
+
+ fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags);
+ if (fd >= 0)
+ break;
+
+ /* Do not try less precise if not requested. */
+ if (!evsel->precise_max)
+ break;
+
+ /*
+ * We tried all the precise_ip values, and it's
+ * still failing, so leave it to standard fallback.
+ */
+ if (!evsel->core.attr.precise_ip) {
+ evsel->core.attr.precise_ip = precise_ip;
+ break;
+ }
+
+ pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", -ENOTSUP);
+ evsel->core.attr.precise_ip--;
+ pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
+ display_attr(&evsel->core.attr);
+ }
+
+ return fd;
+}
+
+static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
+ struct perf_thread_map *threads,
+ int start_cpu, int end_cpu)
+{
+ int cpu, thread, nthreads;
+ unsigned long flags = PERF_FLAG_FD_CLOEXEC;
+ int pid = -1, err, old_errno;
+ enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
+
+ if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
+ (perf_missing_features.aux_output && evsel->core.attr.aux_output))
+ return -EINVAL;
+
+ if (cpus == NULL) {
+ static struct perf_cpu_map *empty_cpu_map;
+
+ if (empty_cpu_map == NULL) {
+ empty_cpu_map = perf_cpu_map__dummy_new();
+ if (empty_cpu_map == NULL)
+ return -ENOMEM;
+ }
+
+ cpus = empty_cpu_map;
+ }
+
+ if (threads == NULL) {
+ static struct perf_thread_map *empty_thread_map;
+
+ if (empty_thread_map == NULL) {
+ empty_thread_map = thread_map__new_by_tid(-1);
+ if (empty_thread_map == NULL)
+ return -ENOMEM;
+ }
+
+ threads = empty_thread_map;
+ }
+
+ if (evsel->core.system_wide)
+ nthreads = 1;
+ else
+ nthreads = threads->nr;
+
+ if (evsel->core.fd == NULL &&
+ perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0)
+ return -ENOMEM;
+
+ if (evsel->cgrp) {
+ flags |= PERF_FLAG_PID_CGROUP;
+ pid = evsel->cgrp->fd;
+ }
+
+fallback_missing_features:
+ if (perf_missing_features.clockid_wrong)
+ evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
+ if (perf_missing_features.clockid) {
+ evsel->core.attr.use_clockid = 0;
+ evsel->core.attr.clockid = 0;
+ }
+ if (perf_missing_features.cloexec)
+ flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
+ if (perf_missing_features.mmap2)
+ evsel->core.attr.mmap2 = 0;
+ if (perf_missing_features.exclude_guest)
+ evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
+ if (perf_missing_features.lbr_flags)
+ evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
+ PERF_SAMPLE_BRANCH_NO_CYCLES);
+ if (perf_missing_features.group_read && evsel->core.attr.inherit)
+ evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
+ if (perf_missing_features.ksymbol)
+ evsel->core.attr.ksymbol = 0;
+ if (perf_missing_features.bpf)
+ evsel->core.attr.bpf_event = 0;
+ if (perf_missing_features.branch_hw_idx)
+ evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
+retry_sample_id:
+ if (perf_missing_features.sample_id_all)
+ evsel->core.attr.sample_id_all = 0;
+
+ display_attr(&evsel->core.attr);
+
+ for (cpu = start_cpu; cpu < end_cpu; cpu++) {
+
+ for (thread = 0; thread < nthreads; thread++) {
+ int fd, group_fd;
+
+ if (!evsel->cgrp && !evsel->core.system_wide)
+ pid = perf_thread_map__pid(threads, thread);
+
+ group_fd = get_group_fd(evsel, cpu, thread);
+retry_open:
+ test_attr__ready();
+
+ fd = perf_event_open(evsel, pid, cpus->map[cpu],
+ group_fd, flags);
+
+ FD(evsel, cpu, thread) = fd;
+
+ if (unlikely(test_attr__enabled)) {
+ test_attr__open(&evsel->core.attr, pid, cpus->map[cpu],
+ fd, group_fd, flags);
+ }
+
+ if (fd < 0) {
+ err = -errno;
+
+ if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
+ /*
+ * We just removed 1 thread, so take a step
+ * back on thread index and lower the upper
+ * nthreads limit.
+ */
+ nthreads--;
+ thread--;
+
+ /* ... and pretend like nothing have happened. */
+ err = 0;
+ continue;
+ }
+
+ pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
+ err);
+ goto try_fallback;
+ }
+
+ pr_debug2_peo(" = %d\n", fd);
+
+ if (evsel->bpf_fd >= 0) {
+ int evt_fd = fd;
+ int bpf_fd = evsel->bpf_fd;
+
+ err = ioctl(evt_fd,
+ PERF_EVENT_IOC_SET_BPF,
+ bpf_fd);
+ if (err && errno != EEXIST) {
+ pr_err("failed to attach bpf fd %d: %s\n",
+ bpf_fd, strerror(errno));
+ err = -EINVAL;
+ goto out_close;
+ }
+ }
+
+ set_rlimit = NO_CHANGE;
+
+ /*
+ * If we succeeded but had to kill clockid, fail and
+ * have evsel__open_strerror() print us a nice error.
+ */
+ if (perf_missing_features.clockid ||
+ perf_missing_features.clockid_wrong) {
+ err = -EINVAL;
+ goto out_close;
+ }
+ }
+ }
+
+ return 0;
+
+try_fallback:
+ /*
+ * perf stat needs between 5 and 22 fds per CPU. When we run out
+ * of them try to increase the limits.
+ */
+ if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
+ struct rlimit l;
+
+ old_errno = errno;
+ if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
+ if (set_rlimit == NO_CHANGE)
+ l.rlim_cur = l.rlim_max;
+ else {
+ l.rlim_cur = l.rlim_max + 1000;
+ l.rlim_max = l.rlim_cur;
+ }
+ if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
+ set_rlimit++;
+ errno = old_errno;
+ goto retry_open;
+ }
+ }
+ errno = old_errno;
+ }
+
+ if (err != -EINVAL || cpu > 0 || thread > 0)
+ goto out_close;
+
+ /*
+ * Must probe features in the order they were added to the
+ * perf_event_attr interface.
+ */
+ if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
+ perf_missing_features.cgroup = true;
+ pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n");
+ goto out_close;
+ } else if (!perf_missing_features.branch_hw_idx &&
+ (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) {
+ perf_missing_features.branch_hw_idx = true;
+ pr_debug2("switching off branch HW index support\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
+ perf_missing_features.aux_output = true;
+ pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
+ goto out_close;
+ } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
+ perf_missing_features.bpf = true;
+ pr_debug2_peo("switching off bpf_event\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
+ perf_missing_features.ksymbol = true;
+ pr_debug2_peo("switching off ksymbol\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
+ perf_missing_features.write_backward = true;
+ pr_debug2_peo("switching off write_backward\n");
+ goto out_close;
+ } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
+ perf_missing_features.clockid_wrong = true;
+ pr_debug2_peo("switching off clockid\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
+ perf_missing_features.clockid = true;
+ pr_debug2_peo("switching off use_clockid\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
+ perf_missing_features.cloexec = true;
+ pr_debug2_peo("switching off cloexec flag\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
+ perf_missing_features.mmap2 = true;
+ pr_debug2_peo("switching off mmap2\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.exclude_guest &&
+ (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) {
+ perf_missing_features.exclude_guest = true;
+ pr_debug2_peo("switching off exclude_guest, exclude_host\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.sample_id_all) {
+ perf_missing_features.sample_id_all = true;
+ pr_debug2_peo("switching off sample_id_all\n");
+ goto retry_sample_id;
+ } else if (!perf_missing_features.lbr_flags &&
+ (evsel->core.attr.branch_sample_type &
+ (PERF_SAMPLE_BRANCH_NO_CYCLES |
+ PERF_SAMPLE_BRANCH_NO_FLAGS))) {
+ perf_missing_features.lbr_flags = true;
+ pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.group_read &&
+ evsel->core.attr.inherit &&
+ (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
+ evsel__is_group_leader(evsel)) {
+ perf_missing_features.group_read = true;
+ pr_debug2_peo("switching off group read\n");
+ goto fallback_missing_features;
+ }
+out_close:
+ if (err)
+ threads->err_thread = thread;
+
+ old_errno = errno;
+ do {
+ while (--thread >= 0) {
+ if (FD(evsel, cpu, thread) >= 0)
+ close(FD(evsel, cpu, thread));
+ FD(evsel, cpu, thread) = -1;
+ }
+ thread = nthreads;
+ } while (--cpu >= 0);
+ errno = old_errno;
+ return err;
+}
+
+int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
+ struct perf_thread_map *threads)
+{
+ return evsel__open_cpu(evsel, cpus, threads, 0, cpus ? cpus->nr : 1);
+}
+
+void evsel__close(struct evsel *evsel)
+{
+ perf_evsel__close(&evsel->core);
+ perf_evsel__free_id(&evsel->core);
+}
+
+int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu)
+{
+ if (cpu == -1)
+ return evsel__open_cpu(evsel, cpus, NULL, 0,
+ cpus ? cpus->nr : 1);
+
+ return evsel__open_cpu(evsel, cpus, NULL, cpu, cpu + 1);
+}
+
+int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads)
+{
+ return evsel__open(evsel, NULL, threads);
+}
+
+static int perf_evsel__parse_id_sample(const struct evsel *evsel,
+ const union perf_event *event,
+ struct perf_sample *sample)
+{
+ u64 type = evsel->core.attr.sample_type;
+ const __u64 *array = event->sample.array;
+ bool swapped = evsel->needs_swap;
+ union u64_swap u;
+
+ array += ((event->header.size -
+ sizeof(event->header)) / sizeof(u64)) - 1;
+
+ if (type & PERF_SAMPLE_IDENTIFIER) {
+ sample->id = *array;
+ array--;
+ }
+
+ if (type & PERF_SAMPLE_CPU) {
+ u.val64 = *array;
+ if (swapped) {
+ /* undo swap of u64, then swap on individual u32s */
+ u.val64 = bswap_64(u.val64);
+ u.val32[0] = bswap_32(u.val32[0]);
+ }
+
+ sample->cpu = u.val32[0];
+ array--;
+ }
+
+ if (type & PERF_SAMPLE_STREAM_ID) {
+ sample->stream_id = *array;
+ array--;
+ }
+
+ if (type & PERF_SAMPLE_ID) {
+ sample->id = *array;
+ array--;
+ }
+
+ if (type & PERF_SAMPLE_TIME) {
+ sample->time = *array;
+ array--;
+ }
+
+ if (type & PERF_SAMPLE_TID) {
+ u.val64 = *array;
+ if (swapped) {
+ /* undo swap of u64, then swap on individual u32s */
+ u.val64 = bswap_64(u.val64);
+ u.val32[0] = bswap_32(u.val32[0]);
+ u.val32[1] = bswap_32(u.val32[1]);
+ }
+
+ sample->pid = u.val32[0];
+ sample->tid = u.val32[1];
+ array--;
+ }
+
+ return 0;
+}
+
+static inline bool overflow(const void *endp, u16 max_size, const void *offset,
+ u64 size)
+{
+ return size > max_size || offset + size > endp;
+}
+
+#define OVERFLOW_CHECK(offset, size, max_size) \
+ do { \
+ if (overflow(endp, (max_size), (offset), (size))) \
+ return -EFAULT; \
+ } while (0)
+
+#define OVERFLOW_CHECK_u64(offset) \
+ OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
+
+static int
+perf_event__check_size(union perf_event *event, unsigned int sample_size)
+{
+ /*
+ * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
+ * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
+ * check the format does not go past the end of the event.
+ */
+ if (sample_size + sizeof(event->header) > event->header.size)
+ return -EFAULT;
+
+ return 0;
+}
+
+int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
+ struct perf_sample *data)
+{
+ u64 type = evsel->core.attr.sample_type;
+ bool swapped = evsel->needs_swap;
+ const __u64 *array;
+ u16 max_size = event->header.size;
+ const void *endp = (void *)event + max_size;
+ u64 sz;
+
+ /*
+ * used for cross-endian analysis. See git commit 65014ab3
+ * for why this goofiness is needed.
+ */
+ union u64_swap u;
+
+ memset(data, 0, sizeof(*data));
+ data->cpu = data->pid = data->tid = -1;
+ data->stream_id = data->id = data->time = -1ULL;
+ data->period = evsel->core.attr.sample_period;
+ data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
+ data->misc = event->header.misc;
+ data->id = -1ULL;
+ data->data_src = PERF_MEM_DATA_SRC_NONE;
+
+ if (event->header.type != PERF_RECORD_SAMPLE) {
+ if (!evsel->core.attr.sample_id_all)
+ return 0;
+ return perf_evsel__parse_id_sample(evsel, event, data);
+ }
+
+ array = event->sample.array;
+
+ if (perf_event__check_size(event, evsel->sample_size))
+ return -EFAULT;
+
+ if (type & PERF_SAMPLE_IDENTIFIER) {
+ data->id = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_IP) {
+ data->ip = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_TID) {
+ u.val64 = *array;
+ if (swapped) {
+ /* undo swap of u64, then swap on individual u32s */
+ u.val64 = bswap_64(u.val64);
+ u.val32[0] = bswap_32(u.val32[0]);
+ u.val32[1] = bswap_32(u.val32[1]);
+ }
+
+ data->pid = u.val32[0];
+ data->tid = u.val32[1];
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_TIME) {
+ data->time = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_ADDR) {
+ data->addr = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_ID) {
+ data->id = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_STREAM_ID) {
+ data->stream_id = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_CPU) {
+
+ u.val64 = *array;
+ if (swapped) {
+ /* undo swap of u64, then swap on individual u32s */
+ u.val64 = bswap_64(u.val64);
+ u.val32[0] = bswap_32(u.val32[0]);
+ }
+
+ data->cpu = u.val32[0];
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_PERIOD) {
+ data->period = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_READ) {
+ u64 read_format = evsel->core.attr.read_format;
+
+ OVERFLOW_CHECK_u64(array);
+ if (read_format & PERF_FORMAT_GROUP)
+ data->read.group.nr = *array;
+ else
+ data->read.one.value = *array;
+
+ array++;
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
+ OVERFLOW_CHECK_u64(array);
+ data->read.time_enabled = *array;
+ array++;
+ }
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
+ OVERFLOW_CHECK_u64(array);
+ data->read.time_running = *array;
+ array++;
+ }
+
+ /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
+ if (read_format & PERF_FORMAT_GROUP) {
+ const u64 max_group_nr = UINT64_MAX /
+ sizeof(struct sample_read_value);
+
+ if (data->read.group.nr > max_group_nr)
+ return -EFAULT;
+ sz = data->read.group.nr *
+ sizeof(struct sample_read_value);
+ OVERFLOW_CHECK(array, sz, max_size);
+ data->read.group.values =
+ (struct sample_read_value *)array;
+ array = (void *)array + sz;
+ } else {
+ OVERFLOW_CHECK_u64(array);
+ data->read.one.id = *array;
+ array++;
+ }
+ }
+
+ if (type & PERF_SAMPLE_CALLCHAIN) {
+ const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
+
+ OVERFLOW_CHECK_u64(array);
+ data->callchain = (struct ip_callchain *)array++;
+ if (data->callchain->nr > max_callchain_nr)
+ return -EFAULT;
+ sz = data->callchain->nr * sizeof(u64);
+ OVERFLOW_CHECK(array, sz, max_size);
+ array = (void *)array + sz;
+ }
+
+ if (type & PERF_SAMPLE_RAW) {
+ OVERFLOW_CHECK_u64(array);
+ u.val64 = *array;
+
+ /*
+ * Undo swap of u64, then swap on individual u32s,
+ * get the size of the raw area and undo all of the
+ * swap. The pevent interface handles endianity by
+ * itself.
+ */
+ if (swapped) {
+ u.val64 = bswap_64(u.val64);
+ u.val32[0] = bswap_32(u.val32[0]);
+ u.val32[1] = bswap_32(u.val32[1]);
+ }
+ data->raw_size = u.val32[0];
+
+ /*
+ * The raw data is aligned on 64bits including the
+ * u32 size, so it's safe to use mem_bswap_64.
+ */
+ if (swapped)
+ mem_bswap_64((void *) array, data->raw_size);
+
+ array = (void *)array + sizeof(u32);
+
+ OVERFLOW_CHECK(array, data->raw_size, max_size);
+ data->raw_data = (void *)array;
+ array = (void *)array + data->raw_size;
+ }
+
+ if (type & PERF_SAMPLE_BRANCH_STACK) {
+ const u64 max_branch_nr = UINT64_MAX /
+ sizeof(struct branch_entry);
+
+ OVERFLOW_CHECK_u64(array);
+ data->branch_stack = (struct branch_stack *)array++;
+
+ if (data->branch_stack->nr > max_branch_nr)
+ return -EFAULT;
+
+ sz = data->branch_stack->nr * sizeof(struct branch_entry);
+ if (evsel__has_branch_hw_idx(evsel))
+ sz += sizeof(u64);
+ else
+ data->no_hw_idx = true;
+ OVERFLOW_CHECK(array, sz, max_size);
+ array = (void *)array + sz;
+ }
+
+ if (type & PERF_SAMPLE_REGS_USER) {
+ OVERFLOW_CHECK_u64(array);
+ data->user_regs.abi = *array;
+ array++;
+
+ if (data->user_regs.abi) {
+ u64 mask = evsel->core.attr.sample_regs_user;
+
+ sz = hweight64(mask) * sizeof(u64);
+ OVERFLOW_CHECK(array, sz, max_size);
+ data->user_regs.mask = mask;
+ data->user_regs.regs = (u64 *)array;
+ array = (void *)array + sz;
+ }
+ }
+
+ if (type & PERF_SAMPLE_STACK_USER) {
+ OVERFLOW_CHECK_u64(array);
+ sz = *array++;
+
+ data->user_stack.offset = ((char *)(array - 1)
+ - (char *) event);
+
+ if (!sz) {
+ data->user_stack.size = 0;
+ } else {
+ OVERFLOW_CHECK(array, sz, max_size);
+ data->user_stack.data = (char *)array;
+ array = (void *)array + sz;
+ OVERFLOW_CHECK_u64(array);
+ data->user_stack.size = *array++;
+ if (WARN_ONCE(data->user_stack.size > sz,
+ "user stack dump failure\n"))
+ return -EFAULT;
+ }
+ }
+
+ if (type & PERF_SAMPLE_WEIGHT) {
+ OVERFLOW_CHECK_u64(array);
+ data->weight = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_DATA_SRC) {
+ OVERFLOW_CHECK_u64(array);
+ data->data_src = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_TRANSACTION) {
+ OVERFLOW_CHECK_u64(array);
+ data->transaction = *array;
+ array++;
+ }
+
+ data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
+ if (type & PERF_SAMPLE_REGS_INTR) {
+ OVERFLOW_CHECK_u64(array);
+ data->intr_regs.abi = *array;
+ array++;
+
+ if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
+ u64 mask = evsel->core.attr.sample_regs_intr;
+
+ sz = hweight64(mask) * sizeof(u64);
+ OVERFLOW_CHECK(array, sz, max_size);
+ data->intr_regs.mask = mask;
+ data->intr_regs.regs = (u64 *)array;
+ array = (void *)array + sz;
+ }
+ }
+
+ data->phys_addr = 0;
+ if (type & PERF_SAMPLE_PHYS_ADDR) {
+ data->phys_addr = *array;
+ array++;
+ }
+
+ data->cgroup = 0;
+ if (type & PERF_SAMPLE_CGROUP) {
+ data->cgroup = *array;
+ array++;
+ }
+
+ if (type & PERF_SAMPLE_AUX) {
+ OVERFLOW_CHECK_u64(array);
+ sz = *array++;
+
+ OVERFLOW_CHECK(array, sz, max_size);
+ /* Undo swap of data */
+ if (swapped)
+ mem_bswap_64((char *)array, sz);
+ data->aux_sample.size = sz;
+ data->aux_sample.data = (char *)array;
+ array = (void *)array + sz;
+ }
+
+ return 0;
+}
+
+int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
+ u64 *timestamp)
+{
+ u64 type = evsel->core.attr.sample_type;
+ const __u64 *array;
+
+ if (!(type & PERF_SAMPLE_TIME))
+ return -1;
+
+ if (event->header.type != PERF_RECORD_SAMPLE) {
+ struct perf_sample data = {
+ .time = -1ULL,
+ };
+
+ if (!evsel->core.attr.sample_id_all)
+ return -1;
+ if (perf_evsel__parse_id_sample(evsel, event, &data))
+ return -1;
+
+ *timestamp = data.time;
+ return 0;
+ }
+
+ array = event->sample.array;
+
+ if (perf_event__check_size(event, evsel->sample_size))
+ return -EFAULT;
+
+ if (type & PERF_SAMPLE_IDENTIFIER)
+ array++;
+
+ if (type & PERF_SAMPLE_IP)
+ array++;
+
+ if (type & PERF_SAMPLE_TID)
+ array++;
+
+ if (type & PERF_SAMPLE_TIME)
+ *timestamp = *array;
+
+ return 0;
+}
+
+struct tep_format_field *evsel__field(struct evsel *evsel, const char *name)
+{
+ return tep_find_field(evsel->tp_format, name);
+}
+
+void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name)
+{
+ struct tep_format_field *field = evsel__field(evsel, name);
+ int offset;
+
+ if (!field)
+ return NULL;
+
+ offset = field->offset;
+
+ if (field->flags & TEP_FIELD_IS_DYNAMIC) {
+ offset = *(int *)(sample->raw_data + field->offset);
+ offset &= 0xffff;
+ }
+
+ return sample->raw_data + offset;
+}
+
+u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
+ bool needs_swap)
+{
+ u64 value;
+ void *ptr = sample->raw_data + field->offset;
+
+ switch (field->size) {
+ case 1:
+ return *(u8 *)ptr;
+ case 2:
+ value = *(u16 *)ptr;
+ break;
+ case 4:
+ value = *(u32 *)ptr;
+ break;
+ case 8:
+ memcpy(&value, ptr, sizeof(u64));
+ break;
+ default:
+ return 0;
+ }
+
+ if (!needs_swap)
+ return value;
+
+ switch (field->size) {
+ case 2:
+ return bswap_16(value);
+ case 4:
+ return bswap_32(value);
+ case 8:
+ return bswap_64(value);
+ default:
+ return 0;
+ }
+
+ return 0;
+}
+
+u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name)
+{
+ struct tep_format_field *field = evsel__field(evsel, name);
+
+ if (!field)
+ return 0;
+
+ return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
+}
+
+bool evsel__fallback(struct evsel *evsel, int err, char *msg, size_t msgsize)
+{
+ int paranoid;
+
+ if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
+ evsel->core.attr.type == PERF_TYPE_HARDWARE &&
+ evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
+ /*
+ * If it's cycles then fall back to hrtimer based
+ * cpu-clock-tick sw counter, which is always available even if
+ * no PMU support.
+ *
+ * PPC returns ENXIO until 2.6.37 (behavior changed with commit
+ * b0a873e).
+ */
+ scnprintf(msg, msgsize, "%s",
+"The cycles event is not supported, trying to fall back to cpu-clock-ticks");
+
+ evsel->core.attr.type = PERF_TYPE_SOFTWARE;
+ evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK;
+
+ zfree(&evsel->name);
+ return true;
+ } else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
+ (paranoid = perf_event_paranoid()) > 1) {
+ const char *name = evsel__name(evsel);
+ char *new_name;
+ const char *sep = ":";
+
+ /* If event has exclude user then don't exclude kernel. */
+ if (evsel->core.attr.exclude_user)
+ return false;
+
+ /* Is there already the separator in the name. */
+ if (strchr(name, '/') ||
+ (strchr(name, ':') && !evsel->is_libpfm_event))
+ sep = "";
+
+ if (asprintf(&new_name, "%s%su", name, sep) < 0)
+ return false;
+
+ if (evsel->name)
+ free(evsel->name);
+ evsel->name = new_name;
+ scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
+ "to fall back to excluding kernel and hypervisor "
+ " samples", paranoid);
+ evsel->core.attr.exclude_kernel = 1;
+ evsel->core.attr.exclude_hv = 1;
+
+ return true;
+ }
+
+ return false;
+}
+
+static bool find_process(const char *name)
+{
+ size_t len = strlen(name);
+ DIR *dir;
+ struct dirent *d;
+ int ret = -1;
+
+ dir = opendir(procfs__mountpoint());
+ if (!dir)
+ return false;
+
+ /* Walk through the directory. */
+ while (ret && (d = readdir(dir)) != NULL) {
+ char path[PATH_MAX];
+ char *data;
+ size_t size;
+
+ if ((d->d_type != DT_DIR) ||
+ !strcmp(".", d->d_name) ||
+ !strcmp("..", d->d_name))
+ continue;
+
+ scnprintf(path, sizeof(path), "%s/%s/comm",
+ procfs__mountpoint(), d->d_name);
+
+ if (filename__read_str(path, &data, &size))
+ continue;
+
+ ret = strncmp(name, data, len);
+ free(data);
+ }
+
+ closedir(dir);
+ return ret ? false : true;
+}
+
+int evsel__open_strerror(struct evsel *evsel, struct target *target,
+ int err, char *msg, size_t size)
+{
+ char sbuf[STRERR_BUFSIZE];
+ int printed = 0, enforced = 0;
+
+ switch (err) {
+ case EPERM:
+ case EACCES:
+ printed += scnprintf(msg + printed, size - printed,
+ "Access to performance monitoring and observability operations is limited.\n");
+
+ if (!sysfs__read_int("fs/selinux/enforce", &enforced)) {
+ if (enforced) {
+ printed += scnprintf(msg + printed, size - printed,
+ "Enforced MAC policy settings (SELinux) can limit access to performance\n"
+ "monitoring and observability operations. Inspect system audit records for\n"
+ "more perf_event access control information and adjusting the policy.\n");
+ }
+ }
+
+ if (err == EPERM)
+ printed += scnprintf(msg, size,
+ "No permission to enable %s event.\n\n", evsel__name(evsel));
+
+ return scnprintf(msg + printed, size - printed,
+ "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n"
+ "access to performance monitoring and observability operations for processes\n"
+ "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n"
+ "More information can be found at 'Perf events and tool security' document:\n"
+ "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n"
+ "perf_event_paranoid setting is %d:\n"
+ " -1: Allow use of (almost) all events by all users\n"
+ " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
+ ">= 0: Disallow raw and ftrace function tracepoint access\n"
+ ">= 1: Disallow CPU event access\n"
+ ">= 2: Disallow kernel profiling\n"
+ "To make the adjusted perf_event_paranoid setting permanent preserve it\n"
+ "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)",
+ perf_event_paranoid());
+ case ENOENT:
+ return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel));
+ case EMFILE:
+ return scnprintf(msg, size, "%s",
+ "Too many events are opened.\n"
+ "Probably the maximum number of open file descriptors has been reached.\n"
+ "Hint: Try again after reducing the number of events.\n"
+ "Hint: Try increasing the limit with 'ulimit -n <limit>'");
+ case ENOMEM:
+ if (evsel__has_callchain(evsel) &&
+ access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
+ return scnprintf(msg, size,
+ "Not enough memory to setup event with callchain.\n"
+ "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
+ "Hint: Current value: %d", sysctl__max_stack());
+ break;
+ case ENODEV:
+ if (target->cpu_list)
+ return scnprintf(msg, size, "%s",
+ "No such device - did you specify an out-of-range profile CPU?");
+ break;
+ case EOPNOTSUPP:
+ if (evsel->core.attr.aux_output)
+ return scnprintf(msg, size,
+ "%s: PMU Hardware doesn't support 'aux_output' feature",
+ evsel__name(evsel));
+ if (evsel->core.attr.sample_period != 0)
+ return scnprintf(msg, size,
+ "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
+ evsel__name(evsel));
+ if (evsel->core.attr.precise_ip)
+ return scnprintf(msg, size, "%s",
+ "\'precise\' request may not be supported. Try removing 'p' modifier.");
+#if defined(__i386__) || defined(__x86_64__)
+ if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
+ return scnprintf(msg, size, "%s",
+ "No hardware sampling interrupt available.\n");
+#endif
+ break;
+ case EBUSY:
+ if (find_process("oprofiled"))
+ return scnprintf(msg, size,
+ "The PMU counters are busy/taken by another profiler.\n"
+ "We found oprofile daemon running, please stop it and try again.");
+ break;
+ case EINVAL:
+ if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
+ return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
+ if (perf_missing_features.clockid)
+ return scnprintf(msg, size, "clockid feature not supported.");
+ if (perf_missing_features.clockid_wrong)
+ return scnprintf(msg, size, "wrong clockid (%d).", clockid);
+ if (perf_missing_features.aux_output)
+ return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
+ break;
+ default:
+ break;
+ }
+
+ return scnprintf(msg, size,
+ "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
+ "/bin/dmesg | grep -i perf may provide additional information.\n",
+ err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel));
+}
+
+struct perf_env *evsel__env(struct evsel *evsel)
+{
+ if (evsel && evsel->evlist)
+ return evsel->evlist->env;
+ return &perf_env;
+}
+
+static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
+{
+ int cpu, thread;
+
+ for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) {
+ for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
+ thread++) {
+ int fd = FD(evsel, cpu, thread);
+
+ if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
+ cpu, thread, fd) < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+int evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
+{
+ struct perf_cpu_map *cpus = evsel->core.cpus;
+ struct perf_thread_map *threads = evsel->core.threads;
+
+ if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr))
+ return -ENOMEM;
+
+ return store_evsel_ids(evsel, evlist);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 14:39:33 +0000