diff options
Diffstat (limited to 'tools/perf/util/evsel.c')
| -rw-r--r-- | tools/perf/util/evsel.c | 3186 |
1 files changed, 3186 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c new file mode 100644 index 000000000..76605fde3 --- /dev/null +++ b/tools/perf/util/evsel.c @@ -0,0 +1,3186 @@ +// 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 "bpf_counter.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" +#ifdef HAVE_LIBBPF_SUPPORT +#include <bpf/hashmap.h> +#else +#include "util/hashmap.h" +#endif +#include "pmu-hybrid.h" +#include "off_cpu.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 const char *const perf_tool_event__tool_names[PERF_TOOL_MAX] = { + NULL, + "duration_time", + "user_time", + "system_time", +}; + +const char *perf_tool_event__to_str(enum perf_tool_event ev) +{ + if (ev > PERF_TOOL_NONE && ev < PERF_TOOL_MAX) + return perf_tool_event__tool_names[ev]; + + return NULL; +} + +enum perf_tool_event perf_tool_event__from_str(const char *str) +{ + int i; + + perf_tool_event__for_each_event(i) { + if (!strcmp(str, perf_tool_event__tool_names[i])) + return i; + } + return PERF_TOOL_NONE; +} + + +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, idx); + evsel->tracking = !idx; + evsel->unit = strdup(""); + 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); + INIT_LIST_HEAD(&evsel->bpf_counter_list); + 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) && !attr->sample_type) { + 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)) { + free((char *)evsel->unit); + evsel->unit = strdup("msec"); + 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 __maybe_unused, __u32 type, __u64 config) +{ + struct perf_event_attr attr = { + .type = type, + .config = config, + .exclude_kernel = !perf_event_can_profile_kernel(), + }; + struct evsel *evsel; + + event_attr_init(&attr); + + /* + * 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. + */ + evsel = evsel__new(&attr); + if (evsel == NULL) + goto out; + + arch_evsel__fixup_new_cycles(&evsel->core.attr); + + 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; +} + +int copy_config_terms(struct list_head *dst, struct list_head *src) +{ + struct evsel_config_term *pos, *tmp; + + list_for_each_entry(pos, src, 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); + } + return 0; +} + +static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src) +{ + return copy_config_terms(&dst->config_terms, &src->config_terms); +} + +/** + * 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; + evsel->core.requires_cpu = orig->core.requires_cpu; + + 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; + } + if (orig->metric_id) { + evsel->metric_id = strdup(orig->metric_id); + if (evsel->metric_id == NULL) + goto out_err; + } + evsel->cgrp = cgroup__get(orig->cgrp); + evsel->tp_format = orig->tp_format; + evsel->handler = orig->handler; + evsel->core.leader = orig->core.leader; + + evsel->max_events = orig->max_events; + evsel->tool_event = orig->tool_event; + free((char *)evsel->unit); + evsel->unit = strdup(orig->unit); + if (evsel->unit == NULL) + goto out_err; + + 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; + evsel->use_config_name = orig->use_config_name; + + 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 *const 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", +}; + +char *evsel__bpf_counter_events; + +bool evsel__match_bpf_counter_events(const char *name) +{ + int name_len; + bool match; + char *ptr; + + if (!evsel__bpf_counter_events) + return false; + + ptr = strstr(evsel__bpf_counter_events, name); + name_len = strlen(name); + + /* check name matches a full token in evsel__bpf_counter_events */ + match = (ptr != NULL) && + ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) && + ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0')); + + return match; +} + +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 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; +} + +int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) +{ + return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config)); +} + +static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size) +{ + int r = arch_evsel__hw_name(evsel, bf, size); + return r + evsel__add_modifiers(evsel, bf + r, size - r); +} + +const char *const 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 + evsel__add_modifiers(evsel, bf + r, size - r); +} + +static int evsel__tool_name(enum perf_tool_event ev, char *bf, size_t size) +{ + return scnprintf(bf, size, "%s", perf_tool_event__to_str(ev)); +} + +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 + evsel__add_modifiers(evsel, bf + r, size - r); +} + +const char *const 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 *const 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 *const 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 operation stat + * L1I : Read and prefetch only + * ITLB and BPU : Read-only + */ +static const 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 + 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 + evsel__add_modifiers(evsel, bf + ret, size - 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__is_tool(evsel)) + evsel__tool_name(evsel->tool_event, 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__metric_id(const struct evsel *evsel) +{ + if (evsel->metric_id) + return evsel->metric_id; + + if (evsel__is_tool(evsel)) + return perf_tool_event__to_str(evsel->tool_event); + + 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 |= arch__user_reg_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 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, ¶m)) { + 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) + 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, ¶m); + } + } +} + +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; +} + +void __weak arch_evsel__set_sample_weight(struct evsel *evsel) +{ + evsel__set_sample_bit(evsel, WEIGHT); +} + +void __weak arch_evsel__fixup_new_cycles(struct perf_event_attr *attr __maybe_unused) +{ +} + +void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused, + struct perf_event_attr *attr __maybe_unused) +{ +} + +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; + } +} + +static bool evsel__is_offcpu_event(struct evsel *evsel) +{ + return evsel__is_bpf_output(evsel) && !strcmp(evsel->name, OFFCPU_EVENT); +} + +/* + * 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(evsel); + 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; + attr->read_format = PERF_FORMAT_LOST; + + 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) + arch_evsel__set_sample_weight(evsel); + + attr->task = track; + attr->mmap = track; + attr->mmap2 = track && !perf_missing_features.mmap2; + attr->comm = track; + attr->build_id = track && opts->build_id; + + /* + * 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->sample_data_page_size) + evsel__set_sample_bit(evsel, DATA_PAGE_SIZE); + + if (opts->sample_code_page_size) + evsel__set_sample_bit(evsel, CODE_PAGE_SIZE); + + 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); + + if (evsel__is_offcpu_event(evsel)) + evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES; + + arch__post_evsel_config(evsel, attr); +} + +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_map_idx) +{ + return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx); +} + +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_map_idx) +{ + return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx); +} + +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; +} + +void free_config_terms(struct list_head *config_terms) +{ + struct evsel_config_term *term, *h; + + list_for_each_entry_safe(term, h, config_terms, list) { + list_del_init(&term->list); + if (term->free_str) + zfree(&term->val.str); + free(term); + } +} + +static void evsel__free_config_terms(struct evsel *evsel) +{ + free_config_terms(&evsel->config_terms); +} + +void evsel__exit(struct evsel *evsel) +{ + assert(list_empty(&evsel->core.node)); + assert(evsel->evlist == NULL); + bpf_counter__destroy(evsel); + 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->unit); + zfree(&evsel->metric_id); + evsel__zero_per_pkg(evsel); + hashmap__free(evsel->per_pkg_mask); + evsel->per_pkg_mask = NULL; + 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_map_idx, int thread, + struct perf_counts_values *count) +{ + struct perf_counts_values tmp; + + if (!evsel->prev_raw_counts) + return; + + if (cpu_map_idx == -1) { + tmp = evsel->prev_raw_counts->aggr; + evsel->prev_raw_counts->aggr = *count; + } else { + tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread); + *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count; + } + + count->val = count->val - tmp.val; + count->ena = count->ena - tmp.ena; + count->run = count->run - tmp.run; +} + +static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread) +{ + struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread); + + return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count); +} + +static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread, + u64 val, u64 ena, u64 run, u64 lost) +{ + struct perf_counts_values *count; + + count = perf_counts(counter->counts, cpu_map_idx, thread); + + count->val = val; + count->ena = ena; + count->run = run; + count->lost = lost; + + perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); +} + +static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data) +{ + u64 read_format = leader->core.attr.read_format; + struct sample_read_value *v; + u64 nr, ena = 0, run = 0, lost = 0; + + 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 = (void *)data; + sample_read_group__for_each(v, nr, read_format) { + struct evsel *counter; + + counter = evlist__id2evsel(leader->evlist, v->id); + if (!counter) + return -EINVAL; + + if (read_format & PERF_FORMAT_LOST) + lost = v->lost; + + evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost); + } + + return 0; +} + +static int evsel__read_group(struct evsel *leader, int cpu_map_idx, 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_map_idx, thread) < 0) + return -EINVAL; + + if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0) + return -errno; + + return evsel__process_group_data(leader, cpu_map_idx, thread, data); +} + +int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread) +{ + u64 read_format = evsel->core.attr.read_format; + + if (read_format & PERF_FORMAT_GROUP) + return evsel__read_group(evsel, cpu_map_idx, thread); + + return evsel__read_one(evsel, cpu_map_idx, thread); +} + +int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale) +{ + struct perf_counts_values count; + size_t nv = scale ? 3 : 1; + + if (FD(evsel, cpu_map_idx, thread) < 0) + return -EINVAL; + + if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0) + return -ENOMEM; + + if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0) + return -errno; + + evsel__compute_deltas(evsel, cpu_map_idx, thread, &count); + perf_counts_values__scale(&count, scale, NULL); + *perf_counts(evsel->counts, cpu_map_idx, thread) = count; + return 0; +} + +static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other, + int cpu_map_idx) +{ + struct perf_cpu cpu; + + cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx); + return perf_cpu_map__idx(other->core.cpus, cpu); +} + +static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx) +{ + struct evsel *leader = evsel__leader(evsel); + + if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) || + (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) { + return evsel__match_other_cpu(evsel, leader, cpu_map_idx); + } + + return cpu_map_idx; +} + +static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread) +{ + struct evsel *leader = evsel__leader(evsel); + 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); + + cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx); + if (cpu_map_idx == -1) + return -1; + + fd = FD(leader, cpu_map_idx, thread); + BUG_ON(fd == -1); + + return fd; +} + +static void 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_map_idx, + int nr_threads, int thread_idx) +{ + struct evsel *pos; + + if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads) + return -EINVAL; + + evlist__for_each_entry(evsel->evlist, pos) { + nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx; + + 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 evsel__ignore_missing_thread(struct evsel *evsel, + int nr_cpus, int cpu_map_idx, + 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_map_idx, 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); + } +} + +bool evsel__precise_ip_fallback(struct evsel *evsel) +{ + /* Do not try less precise if not requested. */ + if (!evsel->precise_max) + return false; + + /* + * 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 = evsel->precise_ip_original; + return false; + } + + if (!evsel->precise_ip_original) + evsel->precise_ip_original = evsel->core.attr.precise_ip; + + 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 true; +} + +static struct perf_cpu_map *empty_cpu_map; +static struct perf_thread_map *empty_thread_map; + +static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, + struct perf_thread_map *threads) +{ + int nthreads = perf_thread_map__nr(threads); + + 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) { + 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) { + 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.fd == NULL && + perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0) + return -ENOMEM; + + evsel->open_flags = PERF_FLAG_FD_CLOEXEC; + if (evsel->cgrp) + evsel->open_flags |= PERF_FLAG_PID_CGROUP; + + return 0; +} + +static void evsel__disable_missing_features(struct evsel *evsel) +{ + if (perf_missing_features.read_lost) + evsel->core.attr.read_format &= ~PERF_FORMAT_LOST; + if (perf_missing_features.weight_struct) { + evsel__set_sample_bit(evsel, WEIGHT); + evsel__reset_sample_bit(evsel, WEIGHT_STRUCT); + } + 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) + evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; + if (perf_missing_features.mmap2) + evsel->core.attr.mmap2 = 0; + if (evsel->pmu && evsel->pmu->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; + if (perf_missing_features.sample_id_all) + evsel->core.attr.sample_id_all = 0; +} + +int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, + struct perf_thread_map *threads) +{ + int err; + + err = __evsel__prepare_open(evsel, cpus, threads); + if (err) + return err; + + evsel__disable_missing_features(evsel); + + return err; +} + +bool evsel__detect_missing_features(struct evsel *evsel) +{ + /* + * Must probe features in the order they were added to the + * perf_event_attr interface. + */ + if (!perf_missing_features.read_lost && + (evsel->core.attr.read_format & PERF_FORMAT_LOST)) { + perf_missing_features.read_lost = true; + pr_debug2("switching off PERF_FORMAT_LOST support\n"); + return true; + } else if (!perf_missing_features.weight_struct && + (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) { + perf_missing_features.weight_struct = true; + pr_debug2("switching off weight struct support\n"); + return true; + } else if (!perf_missing_features.code_page_size && + (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) { + perf_missing_features.code_page_size = true; + pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n"); + return false; + } else if (!perf_missing_features.data_page_size && + (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) { + perf_missing_features.data_page_size = true; + pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n"); + return false; + } else 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"); + return false; + } 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"); + return true; + } 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"); + return false; + } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { + perf_missing_features.bpf = true; + pr_debug2_peo("switching off bpf_event\n"); + return true; + } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { + perf_missing_features.ksymbol = true; + pr_debug2_peo("switching off ksymbol\n"); + return true; + } 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"); + return false; + } 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"); + return true; + } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { + perf_missing_features.clockid = true; + pr_debug2_peo("switching off use_clockid\n"); + return true; + } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) { + perf_missing_features.cloexec = true; + pr_debug2_peo("switching off cloexec flag\n"); + return true; + } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { + perf_missing_features.mmap2 = true; + pr_debug2_peo("switching off mmap2\n"); + return true; + } else if ((evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) && + (evsel->pmu == NULL || evsel->pmu->missing_features.exclude_guest)) { + if (evsel->pmu == NULL) { + evsel->pmu = evsel__find_pmu(evsel); + if (evsel->pmu) + evsel->pmu->missing_features.exclude_guest = true; + else { + /* we cannot find PMU, disable attrs now */ + evsel->core.attr.exclude_host = false; + evsel->core.attr.exclude_guest = false; + } + } + + if (evsel->exclude_GH) { + pr_debug2_peo("PMU has no exclude_host/guest support, bailing out\n"); + return false; + } + if (!perf_missing_features.exclude_guest) { + perf_missing_features.exclude_guest = true; + pr_debug2_peo("switching off exclude_guest, exclude_host\n"); + } + return true; + } else if (!perf_missing_features.sample_id_all) { + perf_missing_features.sample_id_all = true; + pr_debug2_peo("switching off sample_id_all\n"); + return true; + } 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"); + return true; + } 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"); + return true; + } else { + return false; + } +} + +bool evsel__increase_rlimit(enum rlimit_action *set_rlimit) +{ + int old_errno; + struct rlimit l; + + if (*set_rlimit < INCREASED_MAX) { + 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) += 1; + errno = old_errno; + return true; + } + } + errno = old_errno; + } + + return false; +} + +static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, + struct perf_thread_map *threads, + int start_cpu_map_idx, int end_cpu_map_idx) +{ + int idx, thread, nthreads; + int pid = -1, err, old_errno; + enum rlimit_action set_rlimit = NO_CHANGE; + + err = __evsel__prepare_open(evsel, cpus, threads); + if (err) + return err; + + if (cpus == NULL) + cpus = empty_cpu_map; + + if (threads == NULL) + threads = empty_thread_map; + + nthreads = perf_thread_map__nr(threads); + + if (evsel->cgrp) + pid = evsel->cgrp->fd; + +fallback_missing_features: + evsel__disable_missing_features(evsel); + + display_attr(&evsel->core.attr); + + for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) { + + for (thread = 0; thread < nthreads; thread++) { + int fd, group_fd; +retry_open: + if (thread >= nthreads) + break; + + if (!evsel->cgrp && !evsel->core.system_wide) + pid = perf_thread_map__pid(threads, thread); + + group_fd = get_group_fd(evsel, idx, thread); + + test_attr__ready(); + + /* Debug message used by test scripts */ + pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", + pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags); + + fd = sys_perf_event_open(&evsel->core.attr, pid, + perf_cpu_map__cpu(cpus, idx).cpu, + group_fd, evsel->open_flags); + + FD(evsel, idx, thread) = fd; + + if (fd < 0) { + err = -errno; + + pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", + err); + goto try_fallback; + } + + bpf_counter__install_pe(evsel, idx, fd); + + if (unlikely(test_attr__enabled)) { + test_attr__open(&evsel->core.attr, pid, + perf_cpu_map__cpu(cpus, idx), + fd, group_fd, evsel->open_flags); + } + + /* Debug message used by test scripts */ + 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: + if (evsel__precise_ip_fallback(evsel)) + goto retry_open; + + if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus), + idx, threads, thread, err)) { + /* We just removed 1 thread, so lower the upper nthreads limit. */ + nthreads--; + + /* ... and pretend like nothing have happened. */ + err = 0; + goto retry_open; + } + /* + * perf stat needs between 5 and 22 fds per CPU. When we run out + * of them try to increase the limits. + */ + if (err == -EMFILE && evsel__increase_rlimit(&set_rlimit)) + goto retry_open; + + if (err != -EINVAL || idx > 0 || thread > 0) + goto out_close; + + if (evsel__detect_missing_features(evsel)) + goto fallback_missing_features; +out_close: + if (err) + threads->err_thread = thread; + + old_errno = errno; + do { + while (--thread >= 0) { + if (FD(evsel, idx, thread) >= 0) + close(FD(evsel, idx, thread)); + FD(evsel, idx, thread) = -1; + } + thread = nthreads; + } while (--idx >= 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, perf_cpu_map__nr(cpus)); +} + +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_map_idx) +{ + if (cpu_map_idx == -1) + return evsel__open_cpu(evsel, cpus, NULL, 0, perf_cpu_map__nr(cpus)); + + return evsel__open_cpu(evsel, cpus, NULL, cpu_map_idx, cpu_map_idx + 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; +} + +void __weak arch_perf_parse_sample_weight(struct perf_sample *data, + const __u64 *array, + u64 type __maybe_unused) +{ + data->weight = *array; +} + +u64 evsel__bitfield_swap_branch_flags(u64 value) +{ + u64 new_val = 0; + + /* + * branch_flags + * union { + * u64 values; + * struct { + * mispred:1 //target mispredicted + * predicted:1 //target predicted + * in_tx:1 //in transaction + * abort:1 //transaction abort + * cycles:16 //cycle count to last branch + * type:4 //branch type + * reserved:40 + * } + * } + * + * Avoid bswap64() the entire branch_flag.value, + * as it has variable bit-field sizes. Instead the + * macro takes the bit-field position/size, + * swaps it based on the host endianness. + * + * tep_is_bigendian() is used here instead of + * bigendian() to avoid python test fails. + */ + if (tep_is_bigendian()) { + new_val = bitfield_swap(value, 0, 1); + new_val |= bitfield_swap(value, 1, 1); + new_val |= bitfield_swap(value, 2, 1); + new_val |= bitfield_swap(value, 3, 1); + new_val |= bitfield_swap(value, 4, 16); + new_val |= bitfield_swap(value, 20, 4); + new_val |= bitfield_swap(value, 24, 40); + } else { + new_val = bitfield_swap(value, 63, 1); + new_val |= bitfield_swap(value, 62, 1); + new_val |= bitfield_swap(value, 61, 1); + new_val |= bitfield_swap(value, 60, 1); + new_val |= bitfield_swap(value, 44, 16); + new_val |= bitfield_swap(value, 40, 4); + new_val |= bitfield_swap(value, 0, 40); + } + + return new_val; +} + +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; + data->vcpu = -1; + + 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 * sample_read_value_size(read_format); + 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 (read_format & PERF_FORMAT_LOST) { + OVERFLOW_CHECK_u64(array); + data->read.one.lost = *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 endianness 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); + struct branch_entry *e; + unsigned int i; + + 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); + e = &data->branch_stack->entries[0]; + } else { + data->no_hw_idx = true; + /* + * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, + * only nr and entries[] will be output by kernel. + */ + e = (struct branch_entry *)&data->branch_stack->hw_idx; + } + + if (swapped) { + /* + * struct branch_flag does not have endian + * specific bit field definition. And bswap + * will not resolve the issue, since these + * are bit fields. + * + * evsel__bitfield_swap_branch_flags() uses a + * bitfield_swap macro to swap the bit position + * based on the host endians. + */ + for (i = 0; i < data->branch_stack->nr; i++, e++) + e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value); + } + + 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_TYPE) { + OVERFLOW_CHECK_u64(array); + arch_perf_parse_sample_weight(data, array, type); + 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++; + } + + data->data_page_size = 0; + if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { + data->data_page_size = *array; + array++; + } + + data->code_page_size = 0; + if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { + data->code_page_size = *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; +} + +u16 evsel__id_hdr_size(struct evsel *evsel) +{ + u64 sample_type = evsel->core.attr.sample_type; + u16 size = 0; + + if (sample_type & PERF_SAMPLE_TID) + size += sizeof(u64); + + if (sample_type & PERF_SAMPLE_TIME) + size += sizeof(u64); + + if (sample_type & PERF_SAMPLE_ID) + size += sizeof(u64); + + if (sample_type & PERF_SAMPLE_STREAM_ID) + size += sizeof(u64); + + if (sample_type & PERF_SAMPLE_CPU) + size += sizeof(u64); + + if (sample_type & PERF_SAMPLE_IDENTIFIER) + size += sizeof(u64); + + return size; +} + +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; + if (field->flags & TEP_FIELD_IS_RELATIVE) + offset += field->offset + field->size; + } + + 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; +} + +static bool is_amd(const char *arch, const char *cpuid) +{ + return arch && !strcmp("x86", arch) && cpuid && strstarts(cpuid, "AuthenticAMD"); +} + +static bool is_amd_ibs(struct evsel *evsel) +{ + return evsel->core.attr.precise_ip + || (evsel->pmu_name && !strncmp(evsel->pmu_name, "ibs", 3)); +} + +int evsel__open_strerror(struct evsel *evsel, struct target *target, + int err, char *msg, size_t size) +{ + struct perf_env *env = evsel__env(evsel); + const char *arch = perf_env__arch(env); + const char *cpuid = perf_env__cpuid(env); + 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.sample_type & PERF_SAMPLE_BRANCH_STACK) + return scnprintf(msg, size, + "%s: PMU Hardware or event type doesn't support branch stack sampling.", + evsel__name(evsel)); + 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.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size) + return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel."); + if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size) + return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel."); + 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."); + if (!target__has_cpu(target)) + return scnprintf(msg, size, + "Invalid event (%s) in per-thread mode, enable system wide with '-a'.", + evsel__name(evsel)); + if (is_amd(arch, cpuid)) { + if (is_amd_ibs(evsel)) { + if (evsel->core.attr.exclude_kernel) + return scnprintf(msg, size, + "AMD IBS can't exclude kernel events. Try running at a higher privilege level."); + if (!evsel->core.system_wide) + return scnprintf(msg, size, + "AMD IBS may only be available in system-wide/per-cpu mode. Try using -a, or -C and workload affinity"); + } + } + + break; + case ENODATA: + return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. " + "Please add an auxiliary event in front of the load latency event."); + 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 && evsel->evlist->env) + return evsel->evlist->env; + return &perf_env; +} + +static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) +{ + int cpu_map_idx, thread; + + for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) { + for (thread = 0; thread < xyarray__max_y(evsel->core.fd); + thread++) { + int fd = FD(evsel, cpu_map_idx, thread); + + if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, + cpu_map_idx, 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, perf_cpu_map__nr(cpus), threads->nr)) + return -ENOMEM; + + return store_evsel_ids(evsel, evlist); +} + +void evsel__zero_per_pkg(struct evsel *evsel) +{ + struct hashmap_entry *cur; + size_t bkt; + + if (evsel->per_pkg_mask) { + hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt) + free((char *)cur->key); + + hashmap__clear(evsel->per_pkg_mask); + } +} + +bool evsel__is_hybrid(struct evsel *evsel) +{ + return evsel->pmu_name && perf_pmu__is_hybrid(evsel->pmu_name); +} + +struct evsel *evsel__leader(struct evsel *evsel) +{ + return container_of(evsel->core.leader, struct evsel, core); +} + +bool evsel__has_leader(struct evsel *evsel, struct evsel *leader) +{ + return evsel->core.leader == &leader->core; +} + +bool evsel__is_leader(struct evsel *evsel) +{ + return evsel__has_leader(evsel, evsel); +} + +void evsel__set_leader(struct evsel *evsel, struct evsel *leader) +{ + evsel->core.leader = &leader->core; +} + +int evsel__source_count(const struct evsel *evsel) +{ + struct evsel *pos; + int count = 0; + + evlist__for_each_entry(evsel->evlist, pos) { + if (pos->metric_leader == evsel) + count++; + } + return count; +} + +bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused) +{ + return false; +} + +/* + * Remove an event from a given group (leader). + * Some events, e.g., perf metrics Topdown events, + * must always be grouped. Ignore the events. + */ +void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader) +{ + if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) { + evsel__set_leader(evsel, evsel); + evsel->core.nr_members = 0; + leader->core.nr_members--; + } +} |