| /* |
| * 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. |
| * |
| * Released under the GPL v2. (and only v2, not any later version) |
| */ |
| |
| #include <byteswap.h> |
| #include <linux/bitops.h> |
| #include <api/fs/debugfs.h> |
| #include <traceevent/event-parse.h> |
| #include <linux/hw_breakpoint.h> |
| #include <linux/perf_event.h> |
| #include <sys/resource.h> |
| #include "asm/bug.h" |
| #include "callchain.h" |
| #include "cgroup.h" |
| #include "evsel.h" |
| #include "evlist.h" |
| #include "util.h" |
| #include "cpumap.h" |
| #include "thread_map.h" |
| #include "target.h" |
| #include "perf_regs.h" |
| #include "debug.h" |
| #include "trace-event.h" |
| #include "stat.h" |
| |
| static struct { |
| bool sample_id_all; |
| bool exclude_guest; |
| bool mmap2; |
| bool cloexec; |
| bool clockid; |
| bool clockid_wrong; |
| } perf_missing_features; |
| |
| static clockid_t clockid; |
| |
| static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused) |
| { |
| return 0; |
| } |
| |
| static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused) |
| { |
| } |
| |
| static struct { |
| size_t size; |
| int (*init)(struct perf_evsel *evsel); |
| void (*fini)(struct perf_evsel *evsel); |
| } perf_evsel__object = { |
| .size = sizeof(struct perf_evsel), |
| .init = perf_evsel__no_extra_init, |
| .fini = perf_evsel__no_extra_fini, |
| }; |
| |
| int perf_evsel__object_config(size_t object_size, |
| int (*init)(struct perf_evsel *evsel), |
| void (*fini)(struct perf_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->fd, x, y)) |
| |
| int __perf_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 |
| * sample_event. |
| */ |
| 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 perf_evsel__calc_id_pos(struct perf_evsel *evsel) |
| { |
| evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type); |
| evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type); |
| } |
| |
| void __perf_evsel__set_sample_bit(struct perf_evsel *evsel, |
| enum perf_event_sample_format bit) |
| { |
| if (!(evsel->attr.sample_type & bit)) { |
| evsel->attr.sample_type |= bit; |
| evsel->sample_size += sizeof(u64); |
| perf_evsel__calc_id_pos(evsel); |
| } |
| } |
| |
| void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel, |
| enum perf_event_sample_format bit) |
| { |
| if (evsel->attr.sample_type & bit) { |
| evsel->attr.sample_type &= ~bit; |
| evsel->sample_size -= sizeof(u64); |
| perf_evsel__calc_id_pos(evsel); |
| } |
| } |
| |
| void perf_evsel__set_sample_id(struct perf_evsel *evsel, |
| bool can_sample_identifier) |
| { |
| if (can_sample_identifier) { |
| perf_evsel__reset_sample_bit(evsel, ID); |
| perf_evsel__set_sample_bit(evsel, IDENTIFIER); |
| } else { |
| perf_evsel__set_sample_bit(evsel, ID); |
| } |
| evsel->attr.read_format |= PERF_FORMAT_ID; |
| } |
| |
| void perf_evsel__init(struct perf_evsel *evsel, |
| struct perf_event_attr *attr, int idx) |
| { |
| evsel->idx = idx; |
| evsel->tracking = !idx; |
| evsel->attr = *attr; |
| evsel->leader = evsel; |
| evsel->unit = ""; |
| evsel->scale = 1.0; |
| evsel->evlist = NULL; |
| INIT_LIST_HEAD(&evsel->node); |
| INIT_LIST_HEAD(&evsel->config_terms); |
| perf_evsel__object.init(evsel); |
| evsel->sample_size = __perf_evsel__sample_size(attr->sample_type); |
| perf_evsel__calc_id_pos(evsel); |
| evsel->cmdline_group_boundary = false; |
| } |
| |
| struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx) |
| { |
| struct perf_evsel *evsel = zalloc(perf_evsel__object.size); |
| |
| if (evsel != NULL) |
| perf_evsel__init(evsel, attr, idx); |
| |
| return evsel; |
| } |
| |
| struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx) |
| { |
| struct perf_evsel *evsel = zalloc(perf_evsel__object.size); |
| |
| if (evsel != NULL) { |
| 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 (evsel->tp_format == NULL) |
| goto out_free; |
| |
| event_attr_init(&attr); |
| attr.config = evsel->tp_format->id; |
| attr.sample_period = 1; |
| perf_evsel__init(evsel, &attr, idx); |
| } |
| |
| return evsel; |
| |
| out_free: |
| zfree(&evsel->name); |
| free(evsel); |
| return NULL; |
| } |
| |
| const char *perf_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 *__perf_evsel__hw_name(u64 config) |
| { |
| if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config]) |
| return perf_evsel__hw_names[config]; |
| |
| return "unknown-hardware"; |
| } |
| |
| static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size) |
| { |
| int colon = 0, r = 0; |
| struct perf_event_attr *attr = &evsel->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 perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size) |
| { |
| int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config)); |
| return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); |
| } |
| |
| const char *perf_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 *__perf_evsel__sw_name(u64 config) |
| { |
| if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config]) |
| return perf_evsel__sw_names[config]; |
| return "unknown-software"; |
| } |
| |
| static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size) |
| { |
| int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config)); |
| return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); |
| } |
| |
| static int __perf_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 perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size) |
| { |
| struct perf_event_attr *attr = &evsel->attr; |
| int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); |
| return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); |
| } |
| |
| const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX] |
| [PERF_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 *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX] |
| [PERF_EVSEL__MAX_ALIASES] = { |
| { "load", "loads", "read", }, |
| { "store", "stores", "write", }, |
| { "prefetch", "prefetches", "speculative-read", "speculative-load", }, |
| }; |
| |
| const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX] |
| [PERF_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 perf_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 perf_evsel__is_cache_op_valid(u8 type, u8 op) |
| { |
| if (perf_evsel__hw_cache_stat[type] & COP(op)) |
| return true; /* valid */ |
| else |
| return false; /* invalid */ |
| } |
| |
| int __perf_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", perf_evsel__hw_cache[type][0], |
| perf_evsel__hw_cache_op[op][0], |
| perf_evsel__hw_cache_result[result][0]); |
| } |
| |
| return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0], |
| perf_evsel__hw_cache_op[op][1]); |
| } |
| |
| static int __perf_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 (!perf_evsel__is_cache_op_valid(type, op)) |
| goto out_err; |
| |
| return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size); |
| out_err: |
| return scnprintf(bf, size, "%s", err); |
| } |
| |
| static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size) |
| { |
| int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size); |
| return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); |
| } |
| |
| static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size) |
| { |
| int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config); |
| return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); |
| } |
| |
| const char *perf_evsel__name(struct perf_evsel *evsel) |
| { |
| char bf[128]; |
| |
| if (evsel->name) |
| return evsel->name; |
| |
| switch (evsel->attr.type) { |
| case PERF_TYPE_RAW: |
| perf_evsel__raw_name(evsel, bf, sizeof(bf)); |
| break; |
| |
| case PERF_TYPE_HARDWARE: |
| perf_evsel__hw_name(evsel, bf, sizeof(bf)); |
| break; |
| |
| case PERF_TYPE_HW_CACHE: |
| perf_evsel__hw_cache_name(evsel, bf, sizeof(bf)); |
| break; |
| |
| case PERF_TYPE_SOFTWARE: |
| perf_evsel__sw_name(evsel, bf, sizeof(bf)); |
| break; |
| |
| case PERF_TYPE_TRACEPOINT: |
| scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); |
| break; |
| |
| case PERF_TYPE_BREAKPOINT: |
| perf_evsel__bp_name(evsel, bf, sizeof(bf)); |
| break; |
| |
| default: |
| scnprintf(bf, sizeof(bf), "unknown attr type: %d", |
| evsel->attr.type); |
| break; |
| } |
| |
| evsel->name = strdup(bf); |
| |
| return evsel->name ?: "unknown"; |
| } |
| |
| const char *perf_evsel__group_name(struct perf_evsel *evsel) |
| { |
| return evsel->group_name ?: "anon group"; |
| } |
| |
| int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size) |
| { |
| int ret; |
| struct perf_evsel *pos; |
| const char *group_name = perf_evsel__group_name(evsel); |
| |
| ret = scnprintf(buf, size, "%s", group_name); |
| |
| ret += scnprintf(buf + ret, size - ret, " { %s", |
| perf_evsel__name(evsel)); |
| |
| for_each_group_member(pos, evsel) |
| ret += scnprintf(buf + ret, size - ret, ", %s", |
| perf_evsel__name(pos)); |
| |
| ret += scnprintf(buf + ret, size - ret, " }"); |
| |
| return ret; |
| } |
| |
| static void |
| perf_evsel__config_callgraph(struct perf_evsel *evsel, |
| struct record_opts *opts, |
| struct callchain_param *param) |
| { |
| bool function = perf_evsel__is_function_event(evsel); |
| struct perf_event_attr *attr = &evsel->attr; |
| |
| perf_evsel__set_sample_bit(evsel, CALLCHAIN); |
| |
| 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 { |
| perf_evsel__set_sample_bit(evsel, BRANCH_STACK); |
| attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | |
| PERF_SAMPLE_BRANCH_CALL_STACK; |
| } |
| } else |
| pr_warning("Cannot use LBR callstack with branch stack. " |
| "Falling back to framepointers.\n"); |
| } |
| |
| if (param->record_mode == CALLCHAIN_DWARF) { |
| if (!function) { |
| perf_evsel__set_sample_bit(evsel, REGS_USER); |
| perf_evsel__set_sample_bit(evsel, STACK_USER); |
| 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; |
| } |
| } |
| |
| static void |
| perf_evsel__reset_callgraph(struct perf_evsel *evsel, |
| struct callchain_param *param) |
| { |
| struct perf_event_attr *attr = &evsel->attr; |
| |
| perf_evsel__reset_sample_bit(evsel, CALLCHAIN); |
| if (param->record_mode == CALLCHAIN_LBR) { |
| perf_evsel__reset_sample_bit(evsel, BRANCH_STACK); |
| attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | |
| PERF_SAMPLE_BRANCH_CALL_STACK); |
| } |
| if (param->record_mode == CALLCHAIN_DWARF) { |
| perf_evsel__reset_sample_bit(evsel, REGS_USER); |
| perf_evsel__reset_sample_bit(evsel, STACK_USER); |
| } |
| } |
| |
| static void apply_config_terms(struct perf_evsel *evsel, |
| struct record_opts *opts) |
| { |
| struct perf_evsel_config_term *term; |
| struct list_head *config_terms = &evsel->config_terms; |
| struct perf_event_attr *attr = &evsel->attr; |
| struct callchain_param param; |
| u32 dump_size = 0; |
| char *callgraph_buf = NULL; |
| |
| /* callgraph default */ |
| param.record_mode = callchain_param.record_mode; |
| |
| list_for_each_entry(term, config_terms, list) { |
| switch (term->type) { |
| case PERF_EVSEL__CONFIG_TERM_PERIOD: |
| attr->sample_period = term->val.period; |
| attr->freq = 0; |
| break; |
| case PERF_EVSEL__CONFIG_TERM_FREQ: |
| attr->sample_freq = term->val.freq; |
| attr->freq = 1; |
| break; |
| case PERF_EVSEL__CONFIG_TERM_TIME: |
| if (term->val.time) |
| perf_evsel__set_sample_bit(evsel, TIME); |
| else |
| perf_evsel__reset_sample_bit(evsel, TIME); |
| break; |
| case PERF_EVSEL__CONFIG_TERM_CALLGRAPH: |
| callgraph_buf = term->val.callgraph; |
| break; |
| case PERF_EVSEL__CONFIG_TERM_STACK_USER: |
| dump_size = term->val.stack_user; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| /* User explicitly set per-event callgraph, clear the old setting and reset. */ |
| if ((callgraph_buf != NULL) || (dump_size > 0)) { |
| |
| /* 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 (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) |
| perf_evsel__config_callgraph(evsel, opts, ¶m); |
| } |
| } |
| |
| /* |
| * 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 perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts) |
| { |
| struct perf_evsel *leader = evsel->leader; |
| struct perf_event_attr *attr = &evsel->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; |
| |
| perf_evsel__set_sample_bit(evsel, IP); |
| perf_evsel__set_sample_bit(evsel, TID); |
| |
| if (evsel->sample_read) { |
| perf_evsel__set_sample_bit(evsel, READ); |
| |
| /* |
| * We need ID even in case of single event, because |
| * PERF_SAMPLE_READ process ID specific data. |
| */ |
| perf_evsel__set_sample_id(evsel, false); |
| |
| /* |
| * Apply group format only if we belong to group |
| * with more than one members. |
| */ |
| if (leader->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 (!attr->sample_period || (opts->user_freq != UINT_MAX || |
| opts->user_interval != ULLONG_MAX)) { |
| if (opts->freq) { |
| perf_evsel__set_sample_bit(evsel, PERIOD); |
| attr->freq = 1; |
| attr->sample_freq = opts->freq; |
| } else { |
| attr->sample_period = opts->default_interval; |
| } |
| } |
| |
| /* |
| * Disable sampling for all group members other |
| * than leader in case leader 'leads' the sampling. |
| */ |
| if ((leader != evsel) && leader->sample_read) { |
| attr->sample_freq = 0; |
| attr->sample_period = 0; |
| } |
| |
| if (opts->no_samples) |
| attr->sample_freq = 0; |
| |
| if (opts->inherit_stat) |
| attr->inherit_stat = 1; |
| |
| if (opts->sample_address) { |
| perf_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 (perf_evsel__is_function_event(evsel)) |
| evsel->attr.exclude_callchain_user = 1; |
| |
| if (callchain_param.enabled && !evsel->no_aux_samples) |
| perf_evsel__config_callgraph(evsel, opts, &callchain_param); |
| |
| if (opts->sample_intr_regs) { |
| attr->sample_regs_intr = opts->sample_intr_regs; |
| perf_evsel__set_sample_bit(evsel, REGS_INTR); |
| } |
| |
| if (target__has_cpu(&opts->target)) |
| perf_evsel__set_sample_bit(evsel, CPU); |
| |
| if (opts->period) |
| perf_evsel__set_sample_bit(evsel, PERIOD); |
| |
| /* |
| * When the user explicitely 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))) |
| perf_evsel__set_sample_bit(evsel, TIME); |
| |
| if (opts->raw_samples && !evsel->no_aux_samples) { |
| perf_evsel__set_sample_bit(evsel, TIME); |
| perf_evsel__set_sample_bit(evsel, RAW); |
| perf_evsel__set_sample_bit(evsel, CPU); |
| } |
| |
| if (opts->sample_address) |
| perf_evsel__set_sample_bit(evsel, DATA_SRC); |
| |
| if (opts->no_buffering) { |
| attr->watermark = 0; |
| attr->wakeup_events = 1; |
| } |
| if (opts->branch_stack && !evsel->no_aux_samples) { |
| perf_evsel__set_sample_bit(evsel, BRANCH_STACK); |
| attr->branch_sample_type = opts->branch_stack; |
| } |
| |
| if (opts->sample_weight) |
| perf_evsel__set_sample_bit(evsel, WEIGHT); |
| |
| attr->task = track; |
| attr->mmap = track; |
| attr->mmap2 = track && !perf_missing_features.mmap2; |
| attr->comm = track; |
| |
| if (opts->record_switch_events) |
| attr->context_switch = track; |
| |
| if (opts->sample_transaction) |
| perf_evsel__set_sample_bit(evsel, TRANSACTION); |
| |
| if (opts->running_time) { |
| evsel->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 (perf_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) && perf_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; |
| } |
| |
| /* |
| * Apply event specific term settings, |
| * it overloads any global configuration. |
| */ |
| apply_config_terms(evsel, opts); |
| } |
| |
| static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads) |
| { |
| int cpu, thread; |
| |
| if (evsel->system_wide) |
| nthreads = 1; |
| |
| evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int)); |
| |
| if (evsel->fd) { |
| for (cpu = 0; cpu < ncpus; cpu++) { |
| for (thread = 0; thread < nthreads; thread++) { |
| FD(evsel, cpu, thread) = -1; |
| } |
| } |
| } |
| |
| return evsel->fd != NULL ? 0 : -ENOMEM; |
| } |
| |
| static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads, |
| int ioc, void *arg) |
| { |
| int cpu, thread; |
| |
| if (evsel->system_wide) |
| nthreads = 1; |
| |
| for (cpu = 0; cpu < ncpus; cpu++) { |
| for (thread = 0; thread < nthreads; thread++) { |
| int fd = FD(evsel, cpu, thread), |
| err = ioctl(fd, ioc, arg); |
| |
| if (err) |
| return err; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads, |
| const char *filter) |
| { |
| return perf_evsel__run_ioctl(evsel, ncpus, nthreads, |
| PERF_EVENT_IOC_SET_FILTER, |
| (void *)filter); |
| } |
| |
| int perf_evsel__set_filter(struct perf_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; |
| } |
| |
| int perf_evsel__append_filter(struct perf_evsel *evsel, |
| const char *op, const char *filter) |
| { |
| char *new_filter; |
| |
| if (evsel->filter == NULL) |
| return perf_evsel__set_filter(evsel, filter); |
| |
| if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) { |
| free(evsel->filter); |
| evsel->filter = new_filter; |
| return 0; |
| } |
| |
| return -1; |
| } |
| |
| int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads) |
| { |
| return perf_evsel__run_ioctl(evsel, ncpus, nthreads, |
| PERF_EVENT_IOC_ENABLE, |
| 0); |
| } |
| |
| int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads) |
| { |
| if (ncpus == 0 || nthreads == 0) |
| return 0; |
| |
| if (evsel->system_wide) |
| nthreads = 1; |
| |
| evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id)); |
| if (evsel->sample_id == NULL) |
| return -ENOMEM; |
| |
| evsel->id = zalloc(ncpus * nthreads * sizeof(u64)); |
| if (evsel->id == NULL) { |
| xyarray__delete(evsel->sample_id); |
| evsel->sample_id = NULL; |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static void perf_evsel__free_fd(struct perf_evsel *evsel) |
| { |
| xyarray__delete(evsel->fd); |
| evsel->fd = NULL; |
| } |
| |
| static void perf_evsel__free_id(struct perf_evsel *evsel) |
| { |
| xyarray__delete(evsel->sample_id); |
| evsel->sample_id = NULL; |
| zfree(&evsel->id); |
| } |
| |
| static void perf_evsel__free_config_terms(struct perf_evsel *evsel) |
| { |
| struct perf_evsel_config_term *term, *h; |
| |
| list_for_each_entry_safe(term, h, &evsel->config_terms, list) { |
| list_del(&term->list); |
| free(term); |
| } |
| } |
| |
| void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads) |
| { |
| int cpu, thread; |
| |
| if (evsel->system_wide) |
| nthreads = 1; |
| |
| for (cpu = 0; cpu < ncpus; cpu++) |
| for (thread = 0; thread < nthreads; ++thread) { |
| close(FD(evsel, cpu, thread)); |
| FD(evsel, cpu, thread) = -1; |
| } |
| } |
| |
| void perf_evsel__exit(struct perf_evsel *evsel) |
| { |
| assert(list_empty(&evsel->node)); |
| assert(evsel->evlist == NULL); |
| perf_evsel__free_fd(evsel); |
| perf_evsel__free_id(evsel); |
| perf_evsel__free_config_terms(evsel); |
| close_cgroup(evsel->cgrp); |
| cpu_map__put(evsel->cpus); |
| thread_map__put(evsel->threads); |
| zfree(&evsel->group_name); |
| zfree(&evsel->name); |
| perf_evsel__object.fini(evsel); |
| } |
| |
| void perf_evsel__delete(struct perf_evsel *evsel) |
| { |
| perf_evsel__exit(evsel); |
| free(evsel); |
| } |
| |
| void perf_evsel__compute_deltas(struct perf_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 + 0.5); |
| } |
| } else |
| count->ena = count->run = 0; |
| |
| if (pscaled) |
| *pscaled = scaled; |
| } |
| |
| int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread, |
| struct perf_counts_values *count) |
| { |
| memset(count, 0, sizeof(*count)); |
| |
| if (FD(evsel, cpu, thread) < 0) |
| return -EINVAL; |
| |
| if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| int __perf_evsel__read_on_cpu(struct perf_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 && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0) |
| return -ENOMEM; |
| |
| if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0) |
| return -errno; |
| |
| perf_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 perf_evsel *evsel, int cpu, int thread) |
| { |
| struct perf_evsel *leader = evsel->leader; |
| int fd; |
| |
| if (perf_evsel__is_group_leader(evsel)) |
| return -1; |
| |
| /* |
| * Leader must be already processed/open, |
| * if not it's a bug. |
| */ |
| BUG_ON(!leader->fd); |
| |
| fd = FD(leader, cpu, thread); |
| BUG_ON(fd == -1); |
| |
| return fd; |
| } |
| |
| struct bit_names { |
| int bit; |
| const char *name; |
| }; |
| |
| static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits) |
| { |
| bool first_bit = true; |
| int i = 0; |
| |
| do { |
| if (value & bits[i].bit) { |
| buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name); |
| first_bit = false; |
| } |
| } while (bits[++i].name != NULL); |
| } |
| |
| static void __p_sample_type(char *buf, size_t size, u64 value) |
| { |
| #define bit_name(n) { PERF_SAMPLE_##n, #n } |
| struct bit_names bits[] = { |
| bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR), |
| bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU), |
| bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW), |
| bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER), |
| bit_name(IDENTIFIER), bit_name(REGS_INTR), |
| { .name = NULL, } |
| }; |
| #undef bit_name |
| __p_bits(buf, size, value, bits); |
| } |
| |
| static void __p_read_format(char *buf, size_t size, u64 value) |
| { |
| #define bit_name(n) { PERF_FORMAT_##n, #n } |
| struct bit_names bits[] = { |
| bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING), |
| bit_name(ID), bit_name(GROUP), |
| { .name = NULL, } |
| }; |
| #undef bit_name |
| __p_bits(buf, size, value, bits); |
| } |
| |
| #define BUF_SIZE 1024 |
| |
| #define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val)) |
| #define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val)) |
| #define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val)) |
| #define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val) |
| #define p_read_format(val) __p_read_format(buf, BUF_SIZE, val) |
| |
| #define PRINT_ATTRn(_n, _f, _p) \ |
| do { \ |
| if (attr->_f) { \ |
| _p(attr->_f); \ |
| ret += attr__fprintf(fp, _n, buf, priv);\ |
| } \ |
| } while (0) |
| |
| #define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p) |
| |
| int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr, |
| attr__fprintf_f attr__fprintf, void *priv) |
| { |
| char buf[BUF_SIZE]; |
| int ret = 0; |
| |
| PRINT_ATTRf(type, p_unsigned); |
| PRINT_ATTRf(size, p_unsigned); |
| PRINT_ATTRf(config, p_hex); |
| PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned); |
| PRINT_ATTRf(sample_type, p_sample_type); |
| PRINT_ATTRf(read_format, p_read_format); |
| |
| PRINT_ATTRf(disabled, p_unsigned); |
| PRINT_ATTRf(inherit, p_unsigned); |
| PRINT_ATTRf(pinned, p_unsigned); |
| PRINT_ATTRf(exclusive, p_unsigned); |
| PRINT_ATTRf(exclude_user, p_unsigned); |
| PRINT_ATTRf(exclude_kernel, p_unsigned); |
| PRINT_ATTRf(exclude_hv, p_unsigned); |
| PRINT_ATTRf(exclude_idle, p_unsigned); |
| PRINT_ATTRf(mmap, p_unsigned); |
| PRINT_ATTRf(comm, p_unsigned); |
| PRINT_ATTRf(freq, p_unsigned); |
| PRINT_ATTRf(inherit_stat, p_unsigned); |
| PRINT_ATTRf(enable_on_exec, p_unsigned); |
| PRINT_ATTRf(task, p_unsigned); |
| PRINT_ATTRf(watermark, p_unsigned); |
| PRINT_ATTRf(precise_ip, p_unsigned); |
| PRINT_ATTRf(mmap_data, p_unsigned); |
| PRINT_ATTRf(sample_id_all, p_unsigned); |
| PRINT_ATTRf(exclude_host, p_unsigned); |
| PRINT_ATTRf(exclude_guest, p_unsigned); |
| PRINT_ATTRf(exclude_callchain_kernel, p_unsigned); |
| PRINT_ATTRf(exclude_callchain_user, p_unsigned); |
| PRINT_ATTRf(mmap2, p_unsigned); |
| PRINT_ATTRf(comm_exec, p_unsigned); |
| PRINT_ATTRf(use_clockid, p_unsigned); |
| PRINT_ATTRf(context_switch, p_unsigned); |
| |
| PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned); |
| PRINT_ATTRf(bp_type, p_unsigned); |
| PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex); |
| PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex); |
| PRINT_ATTRf(sample_regs_user, p_hex); |
| PRINT_ATTRf(sample_stack_user, p_unsigned); |
| PRINT_ATTRf(clockid, p_signed); |
| PRINT_ATTRf(sample_regs_intr, p_hex); |
| PRINT_ATTRf(aux_watermark, p_unsigned); |
| |
| return ret; |
| } |
| |
| static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, |
| void *priv __attribute__((unused))) |
| { |
| return fprintf(fp, " %-32s %s\n", name, val); |
| } |
| |
| static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, |
| struct thread_map *threads) |
| { |
| int cpu, thread, nthreads; |
| unsigned long flags = PERF_FLAG_FD_CLOEXEC; |
| int pid = -1, err; |
| enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE; |
| |
| if (evsel->system_wide) |
| nthreads = 1; |
| else |
| nthreads = threads->nr; |
| |
| if (evsel->fd == NULL && |
| perf_evsel__alloc_fd(evsel, 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->attr.clockid = CLOCK_MONOTONIC; /* should always work */ |
| if (perf_missing_features.clockid) { |
| evsel->attr.use_clockid = 0; |
| evsel->attr.clockid = 0; |
| } |
| if (perf_missing_features.cloexec) |
| flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; |
| if (perf_missing_features.mmap2) |
| evsel->attr.mmap2 = 0; |
| if (perf_missing_features.exclude_guest) |
| evsel->attr.exclude_guest = evsel->attr.exclude_host = 0; |
| retry_sample_id: |
| if (perf_missing_features.sample_id_all) |
| evsel->attr.sample_id_all = 0; |
| |
| if (verbose >= 2) { |
| fprintf(stderr, "%.60s\n", graph_dotted_line); |
| fprintf(stderr, "perf_event_attr:\n"); |
| perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL); |
| fprintf(stderr, "%.60s\n", graph_dotted_line); |
| } |
| |
| for (cpu = 0; cpu < cpus->nr; cpu++) { |
| |
| for (thread = 0; thread < nthreads; thread++) { |
| int group_fd; |
| |
| if (!evsel->cgrp && !evsel->system_wide) |
| pid = thread_map__pid(threads, thread); |
| |
| group_fd = get_group_fd(evsel, cpu, thread); |
| retry_open: |
| pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n", |
| pid, cpus->map[cpu], group_fd, flags); |
| |
| FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr, |
| pid, |
| cpus->map[cpu], |
| group_fd, flags); |
| if (FD(evsel, cpu, thread) < 0) { |
| err = -errno; |
| pr_debug2("sys_perf_event_open failed, error %d\n", |
| err); |
| goto try_fallback; |
| } |
| set_rlimit = NO_CHANGE; |
| |
| /* |
| * If we succeeded but had to kill clockid, fail and |
| * have perf_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; |
| int 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.clockid_wrong && evsel->attr.use_clockid) { |
| perf_missing_features.clockid_wrong = true; |
| goto fallback_missing_features; |
| } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) { |
| perf_missing_features.clockid = true; |
| goto fallback_missing_features; |
| } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) { |
| perf_missing_features.cloexec = true; |
| goto fallback_missing_features; |
| } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) { |
| perf_missing_features.mmap2 = true; |
| goto fallback_missing_features; |
| } else if (!perf_missing_features.exclude_guest && |
| (evsel->attr.exclude_guest || evsel->attr.exclude_host)) { |
| perf_missing_features.exclude_guest = true; |
| goto fallback_missing_features; |
| } else if (!perf_missing_features.sample_id_all) { |
| perf_missing_features.sample_id_all = true; |
| goto retry_sample_id; |
| } |
| |
| out_close: |
| do { |
| while (--thread >= 0) { |
| close(FD(evsel, cpu, thread)); |
| FD(evsel, cpu, thread) = -1; |
| } |
| thread = nthreads; |
| } while (--cpu >= 0); |
| return err; |
| } |
| |
| void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads) |
| { |
| if (evsel->fd == NULL) |
| return; |
| |
| perf_evsel__close_fd(evsel, ncpus, nthreads); |
| perf_evsel__free_fd(evsel); |
| } |
| |
| static struct { |
| struct cpu_map map; |
| int cpus[1]; |
| } empty_cpu_map = { |
| .map.nr = 1, |
| .cpus = { -1, }, |
| }; |
| |
| static struct { |
| struct thread_map map; |
| int threads[1]; |
| } empty_thread_map = { |
| .map.nr = 1, |
| .threads = { -1, }, |
| }; |
| |
| int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, |
| struct thread_map *threads) |
| { |
| if (cpus == NULL) { |
| /* Work around old compiler warnings about strict aliasing */ |
| cpus = &empty_cpu_map.map; |
| } |
| |
| if (threads == NULL) |
| threads = &empty_thread_map.map; |
| |
| return __perf_evsel__open(evsel, cpus, threads); |
| } |
| |
| int perf_evsel__open_per_cpu(struct perf_evsel *evsel, |
| struct cpu_map *cpus) |
| { |
| return __perf_evsel__open(evsel, cpus, &empty_thread_map.map); |
| } |
| |
| int perf_evsel__open_per_thread(struct perf_evsel *evsel, |
| struct thread_map *threads) |
| { |
| return __perf_evsel__open(evsel, &empty_cpu_map.map, threads); |
| } |
| |
| static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel, |
| const union perf_event *event, |
| struct perf_sample *sample) |
| { |
| u64 type = evsel->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)) |
| |
| int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event, |
| struct perf_sample *data) |
| { |
| u64 type = evsel->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->attr.sample_period; |
| data->weight = 0; |
| |
| if (event->header.type != PERF_RECORD_SAMPLE) { |
| if (!evsel->attr.sample_id_all) |
| return 0; |
| return perf_evsel__parse_id_sample(evsel, event, data); |
| } |
| |
| array = event->sample.array; |
| |
| /* |
| * 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 (evsel->sample_size + sizeof(event->header) > event->header.size) |
| return -EFAULT; |
| |
| data->id = -1ULL; |
| 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++; |
| } |
| |
| data->addr = 0; |
| 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->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; |
| if (WARN_ONCE(swapped, |
| "Endianness of raw data not corrected!\n")) { |
| /* 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->raw_size = u.val32[0]; |
| 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); |
| 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->attr.sample_regs_user; |
| |
| sz = hweight_long(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; |
| } |
| } |
| |
| data->weight = 0; |
| if (type & PERF_SAMPLE_WEIGHT) { |
| OVERFLOW_CHECK_u64(array); |
| data->weight = *array; |
| array++; |
| } |
| |
| data->data_src = PERF_MEM_DATA_SRC_NONE; |
| if (type & PERF_SAMPLE_DATA_SRC) { |
| OVERFLOW_CHECK_u64(array); |
| data->data_src = *array; |
| array++; |
| } |
| |
| data->transaction = 0; |
| 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->attr.sample_regs_intr; |
| |
| sz = hweight_long(mask) * sizeof(u64); |
| OVERFLOW_CHECK(array, sz, max_size); |
| data->intr_regs.mask = mask; |
| data->intr_regs.regs = (u64 *)array; |
| array = (void *)array + sz; |
| } |
| } |
| |
| return 0; |
| } |
| |
| size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, |
| u64 read_format) |
| { |
| size_t sz, result = sizeof(struct sample_event); |
| |
| if (type & PERF_SAMPLE_IDENTIFIER) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_IP) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_TID) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_TIME) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_ADDR) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_ID) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_STREAM_ID) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_CPU) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_PERIOD) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_READ) { |
| result += sizeof(u64); |
| if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
| result += sizeof(u64); |
| if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
| result += sizeof(u64); |
| /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ |
| if (read_format & PERF_FORMAT_GROUP) { |
| sz = sample->read.group.nr * |
| sizeof(struct sample_read_value); |
| result += sz; |
| } else { |
| result += sizeof(u64); |
| } |
| } |
| |
| if (type & PERF_SAMPLE_CALLCHAIN) { |
| sz = (sample->callchain->nr + 1) * sizeof(u64); |
| result += sz; |
| } |
| |
| if (type & PERF_SAMPLE_RAW) { |
| result += sizeof(u32); |
| result += sample->raw_size; |
| } |
| |
| if (type & PERF_SAMPLE_BRANCH_STACK) { |
| sz = sample->branch_stack->nr * sizeof(struct branch_entry); |
| sz += sizeof(u64); |
| result += sz; |
| } |
| |
| if (type & PERF_SAMPLE_REGS_USER) { |
| if (sample->user_regs.abi) { |
| result += sizeof(u64); |
| sz = hweight_long(sample->user_regs.mask) * sizeof(u64); |
| result += sz; |
| } else { |
| result += sizeof(u64); |
| } |
| } |
| |
| if (type & PERF_SAMPLE_STACK_USER) { |
| sz = sample->user_stack.size; |
| result += sizeof(u64); |
| if (sz) { |
| result += sz; |
| result += sizeof(u64); |
| } |
| } |
| |
| if (type & PERF_SAMPLE_WEIGHT) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_DATA_SRC) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_TRANSACTION) |
| result += sizeof(u64); |
| |
| if (type & PERF_SAMPLE_REGS_INTR) { |
| if (sample->intr_regs.abi) { |
| result += sizeof(u64); |
| sz = hweight_long(sample->intr_regs.mask) * sizeof(u64); |
| result += sz; |
| } else { |
| result += sizeof(u64); |
| } |
| } |
| |
| return result; |
| } |
| |
| int perf_event__synthesize_sample(union perf_event *event, u64 type, |
| u64 read_format, |
| const struct perf_sample *sample, |
| bool swapped) |
| { |
| u64 *array; |
| size_t sz; |
| /* |
| * used for cross-endian analysis. See git commit 65014ab3 |
| * for why this goofiness is needed. |
| */ |
| union u64_swap u; |
| |
| array = event->sample.array; |
| |
| if (type & PERF_SAMPLE_IDENTIFIER) { |
| *array = sample->id; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_IP) { |
| *array = sample->ip; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_TID) { |
| u.val32[0] = sample->pid; |
| u.val32[1] = sample->tid; |
| if (swapped) { |
| /* |
| * Inverse of what is done in perf_evsel__parse_sample |
| */ |
| u.val32[0] = bswap_32(u.val32[0]); |
| u.val32[1] = bswap_32(u.val32[1]); |
| u.val64 = bswap_64(u.val64); |
| } |
| |
| *array = u.val64; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_TIME) { |
| *array = sample->time; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_ADDR) { |
| *array = sample->addr; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_ID) { |
| *array = sample->id; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_STREAM_ID) { |
| *array = sample->stream_id; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_CPU) { |
| u.val32[0] = sample->cpu; |
| if (swapped) { |
| /* |
| * Inverse of what is done in perf_evsel__parse_sample |
| */ |
| u.val32[0] = bswap_32(u.val32[0]); |
| u.val64 = bswap_64(u.val64); |
| } |
| *array = u.val64; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_PERIOD) { |
| *array = sample->period; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_READ) { |
| if (read_format & PERF_FORMAT_GROUP) |
| *array = sample->read.group.nr; |
| else |
| *array = sample->read.one.value; |
| array++; |
| |
| if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { |
| *array = sample->read.time_enabled; |
| array++; |
| } |
| |
| if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { |
| *array = sample->read.time_running; |
| array++; |
| } |
| |
| /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ |
| if (read_format & PERF_FORMAT_GROUP) { |
| sz = sample->read.group.nr * |
| sizeof(struct sample_read_value); |
| memcpy(array, sample->read.group.values, sz); |
| array = (void *)array + sz; |
| } else { |
| *array = sample->read.one.id; |
| array++; |
| } |
| } |
| |
| if (type & PERF_SAMPLE_CALLCHAIN) { |
| sz = (sample->callchain->nr + 1) * sizeof(u64); |
| memcpy(array, sample->callchain, sz); |
| array = (void *)array + sz; |
| } |
| |
| if (type & PERF_SAMPLE_RAW) { |
| u.val32[0] = sample->raw_size; |
| if (WARN_ONCE(swapped, |
| "Endianness of raw data not corrected!\n")) { |
| /* |
| * Inverse of what is done in perf_evsel__parse_sample |
| */ |
| u.val32[0] = bswap_32(u.val32[0]); |
| u.val32[1] = bswap_32(u.val32[1]); |
| u.val64 = bswap_64(u.val64); |
| } |
| *array = u.val64; |
| array = (void *)array + sizeof(u32); |
| |
| memcpy(array, sample->raw_data, sample->raw_size); |
| array = (void *)array + sample->raw_size; |
| } |
| |
| if (type & PERF_SAMPLE_BRANCH_STACK) { |
| sz = sample->branch_stack->nr * sizeof(struct branch_entry); |
| sz += sizeof(u64); |
| memcpy(array, sample->branch_stack, sz); |
| array = (void *)array + sz; |
| } |
| |
| if (type & PERF_SAMPLE_REGS_USER) { |
| if (sample->user_regs.abi) { |
| *array++ = sample->user_regs.abi; |
| sz = hweight_long(sample->user_regs.mask) * sizeof(u64); |
| memcpy(array, sample->user_regs.regs, sz); |
| array = (void *)array + sz; |
| } else { |
| *array++ = 0; |
| } |
| } |
| |
| if (type & PERF_SAMPLE_STACK_USER) { |
| sz = sample->user_stack.size; |
| *array++ = sz; |
| if (sz) { |
| memcpy(array, sample->user_stack.data, sz); |
| array = (void *)array + sz; |
| *array++ = sz; |
| } |
| } |
| |
| if (type & PERF_SAMPLE_WEIGHT) { |
| *array = sample->weight; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_DATA_SRC) { |
| *array = sample->data_src; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_TRANSACTION) { |
| *array = sample->transaction; |
| array++; |
| } |
| |
| if (type & PERF_SAMPLE_REGS_INTR) { |
| if (sample->intr_regs.abi) { |
| *array++ = sample->intr_regs.abi; |
| sz = hweight_long(sample->intr_regs.mask) * sizeof(u64); |
| memcpy(array, sample->intr_regs.regs, sz); |
| array = (void *)array + sz; |
| } else { |
| *array++ = 0; |
| } |
| } |
| |
| return 0; |
| } |
| |
| struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name) |
| { |
| return pevent_find_field(evsel->tp_format, name); |
| } |
| |
| void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample, |
| const char *name) |
| { |
| struct format_field *field = perf_evsel__field(evsel, name); |
| int offset; |
| |
| if (!field) |
| return NULL; |
| |
| offset = field->offset; |
| |
| if (field->flags & FIELD_IS_DYNAMIC) { |
| offset = *(int *)(sample->raw_data + field->offset); |
| offset &= 0xffff; |
| } |
| |
| return sample->raw_data + offset; |
| } |
| |
| u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample, |
| const char *name) |
| { |
| struct format_field *field = perf_evsel__field(evsel, name); |
| void *ptr; |
| u64 value; |
| |
| if (!field) |
| return 0; |
| |
| 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 (!evsel->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; |
| } |
| |
| static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...) |
| { |
| va_list args; |
| int ret = 0; |
| |
| if (!*first) { |
| ret += fprintf(fp, ","); |
| } else { |
| ret += fprintf(fp, ":"); |
| *first = false; |
| } |
| |
| va_start(args, fmt); |
| ret += vfprintf(fp, fmt, args); |
| va_end(args); |
| return ret; |
| } |
| |
| static int __print_attr__fprintf(FILE *fp, const char *name, const char *val, void *priv) |
| { |
| return comma_fprintf(fp, (bool *)priv, " %s: %s", name, val); |
| } |
| |
| int perf_evsel__fprintf(struct perf_evsel *evsel, |
| struct perf_attr_details *details, FILE *fp) |
| { |
| bool first = true; |
| int printed = 0; |
| |
| if (details->event_group) { |
| struct perf_evsel *pos; |
| |
| if (!perf_evsel__is_group_leader(evsel)) |
| return 0; |
| |
| if (evsel->nr_members > 1) |
| printed += fprintf(fp, "%s{", evsel->group_name ?: ""); |
| |
| printed += fprintf(fp, "%s", perf_evsel__name(evsel)); |
| for_each_group_member(pos, evsel) |
| printed += fprintf(fp, ",%s", perf_evsel__name(pos)); |
| |
| if (evsel->nr_members > 1) |
| printed += fprintf(fp, "}"); |
| goto out; |
| } |
| |
| printed += fprintf(fp, "%s", perf_evsel__name(evsel)); |
| |
| if (details->verbose) { |
| printed += perf_event_attr__fprintf(fp, &evsel->attr, |
| __print_attr__fprintf, &first); |
| } else if (details->freq) { |
| const char *term = "sample_freq"; |
| |
| if (!evsel->attr.freq) |
| term = "sample_period"; |
| |
| printed += comma_fprintf(fp, &first, " %s=%" PRIu64, |
| term, (u64)evsel->attr.sample_freq); |
| } |
| out: |
| fputc('\n', fp); |
| return ++printed; |
| } |
| |
| bool perf_evsel__fallback(struct perf_evsel *evsel, int err, |
| char *msg, size_t msgsize) |
| { |
| if ((err == ENOENT || err == ENXIO || err == ENODEV) && |
| evsel->attr.type == PERF_TYPE_HARDWARE && |
| evsel->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->attr.type = PERF_TYPE_SOFTWARE; |
| evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK; |
| |
| zfree(&evsel->name); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target, |
| int err, char *msg, size_t size) |
| { |
| char sbuf[STRERR_BUFSIZE]; |
| |
| switch (err) { |
| case EPERM: |
| case EACCES: |
| return scnprintf(msg, size, |
| "You may not have permission to collect %sstats.\n" |
| "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n" |
| " -1 - Not paranoid at all\n" |
| " 0 - Disallow raw tracepoint access for unpriv\n" |
| " 1 - Disallow cpu events for unpriv\n" |
| " 2 - Disallow kernel profiling for unpriv", |
| target->system_wide ? "system-wide " : ""); |
| case ENOENT: |
| return scnprintf(msg, size, "The %s event is not supported.", |
| perf_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 ENODEV: |
| if (target->cpu_list) |
| return scnprintf(msg, size, "%s", |
| "No such device - did you specify an out-of-range profile CPU?\n"); |
| break; |
| case EOPNOTSUPP: |
| if (evsel->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->attr.type == PERF_TYPE_HARDWARE) |
| return scnprintf(msg, size, "%s", |
| "No hardware sampling interrupt available.\n" |
| "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it."); |
| #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 (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); |
| break; |
| default: |
| break; |
| } |
| |
| return scnprintf(msg, size, |
| "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" |
| "/bin/dmesg may provide additional information.\n" |
| "No CONFIG_PERF_EVENTS=y kernel support configured?\n", |
| err, strerror_r(err, sbuf, sizeof(sbuf)), |
| perf_evsel__name(evsel)); |
| } |