1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) 2 #include "tp_pmu.h" 3 #include "pmus.h" 4 #include <api/fs/fs.h> 5 #include <api/fs/tracing_path.h> 6 #include <api/io_dir.h> 7 #include <linux/kernel.h> 8 #include <errno.h> 9 #include <string.h> 10 11 int tp_pmu__id(const char *sys, const char *name) 12 { 13 char *tp_dir = get_events_file(sys); 14 char path[PATH_MAX]; 15 int id, err; 16 17 if (!tp_dir) 18 return -1; 19 20 scnprintf(path, PATH_MAX, "%s/%s/id", tp_dir, name); 21 put_events_file(tp_dir); 22 err = filename__read_int(path, &id); 23 if (err) 24 return err; 25 26 return id; 27 } 28 29 30 int tp_pmu__for_each_tp_event(const char *sys, void *state, tp_event_callback cb) 31 { 32 char *evt_path; 33 struct io_dirent64 *evt_ent; 34 struct io_dir evt_dir; 35 int ret = 0; 36 37 evt_path = get_events_file(sys); 38 if (!evt_path) 39 return -errno; 40 41 io_dir__init(&evt_dir, open(evt_path, O_CLOEXEC | O_DIRECTORY | O_RDONLY)); 42 if (evt_dir.dirfd < 0) { 43 ret = -errno; 44 put_events_file(evt_path); 45 return ret; 46 } 47 put_events_file(evt_path); 48 49 while (!ret && (evt_ent = io_dir__readdir(&evt_dir))) { 50 if (!strcmp(evt_ent->d_name, ".") 51 || !strcmp(evt_ent->d_name, "..") 52 || !strcmp(evt_ent->d_name, "enable") 53 || !strcmp(evt_ent->d_name, "filter")) 54 continue; 55 56 ret = cb(state, sys, evt_ent->d_name); 57 if (ret) 58 break; 59 } 60 close(evt_dir.dirfd); 61 return ret; 62 } 63 64 int tp_pmu__for_each_tp_sys(void *state, tp_sys_callback cb) 65 { 66 struct io_dirent64 *events_ent; 67 struct io_dir events_dir; 68 int ret = 0; 69 char *events_dir_path = get_tracing_file("events"); 70 71 if (!events_dir_path) 72 return -errno; 73 74 io_dir__init(&events_dir, open(events_dir_path, O_CLOEXEC | O_DIRECTORY | O_RDONLY)); 75 if (events_dir.dirfd < 0) { 76 ret = -errno; 77 put_events_file(events_dir_path); 78 return ret; 79 } 80 put_events_file(events_dir_path); 81 82 while (!ret && (events_ent = io_dir__readdir(&events_dir))) { 83 if (!strcmp(events_ent->d_name, ".") || 84 !strcmp(events_ent->d_name, "..") || 85 !strcmp(events_ent->d_name, "enable") || 86 !strcmp(events_ent->d_name, "header_event") || 87 !strcmp(events_ent->d_name, "header_page")) 88 continue; 89 90 ret = cb(state, events_ent->d_name); 91 } 92 close(events_dir.dirfd); 93 return ret; 94 } 95 96 bool perf_pmu__is_tracepoint(const struct perf_pmu *pmu) 97 { 98 return pmu->type == PERF_TYPE_TRACEPOINT; 99 } 100 101 struct for_each_event_args { 102 void *state; 103 pmu_event_callback cb; 104 const struct perf_pmu *pmu; 105 }; 106 107 static int for_each_event_cb(void *state, const char *sys_name, const char *evt_name) 108 { 109 struct for_each_event_args *args = state; 110 char name[2 * FILENAME_MAX + 2]; 111 /* 16 possible hex digits and 22 other characters and \0. */ 112 char encoding[16 + 22]; 113 char *format = NULL; 114 size_t format_size; 115 struct pmu_event_info info = { 116 .pmu = args->pmu, 117 .pmu_name = args->pmu->name, 118 .event_type_desc = "Tracepoint event", 119 }; 120 char *tp_dir = get_events_file(sys_name); 121 char path[PATH_MAX]; 122 int id, err; 123 124 if (!tp_dir) 125 return -1; 126 127 scnprintf(path, sizeof(path), "%s/%s/id", tp_dir, evt_name); 128 err = filename__read_int(path, &id); 129 if (err == 0) { 130 snprintf(encoding, sizeof(encoding), "tracepoint/config=0x%x/", id); 131 info.encoding_desc = encoding; 132 } 133 134 scnprintf(path, sizeof(path), "%s/%s/format", tp_dir, evt_name); 135 put_events_file(tp_dir); 136 err = filename__read_str(path, &format, &format_size); 137 if (err == 0) { 138 info.long_desc = format; 139 for (size_t i = 0 ; i < format_size; i++) { 140 /* Swap tabs to spaces due to some rendering issues. */ 141 if (format[i] == '\t') 142 format[i] = ' '; 143 } 144 } 145 snprintf(name, sizeof(name), "%s:%s", sys_name, evt_name); 146 info.name = name; 147 err = args->cb(args->state, &info); 148 free(format); 149 return err; 150 } 151 152 static int for_each_event_sys_cb(void *state, const char *sys_name) 153 { 154 return tp_pmu__for_each_tp_event(sys_name, state, for_each_event_cb); 155 } 156 157 int tp_pmu__for_each_event(struct perf_pmu *pmu, void *state, pmu_event_callback cb) 158 { 159 struct for_each_event_args args = { 160 .state = state, 161 .cb = cb, 162 .pmu = pmu, 163 }; 164 165 return tp_pmu__for_each_tp_sys(&args, for_each_event_sys_cb); 166 } 167 168 static int num_events_cb(void *state, const char *sys_name __maybe_unused, 169 const char *evt_name __maybe_unused) 170 { 171 size_t *count = state; 172 173 (*count)++; 174 return 0; 175 } 176 177 static int num_events_sys_cb(void *state, const char *sys_name) 178 { 179 return tp_pmu__for_each_tp_event(sys_name, state, num_events_cb); 180 } 181 182 size_t tp_pmu__num_events(struct perf_pmu *pmu __maybe_unused) 183 { 184 size_t count = 0; 185 186 tp_pmu__for_each_tp_sys(&count, num_events_sys_cb); 187 return count; 188 } 189 190 bool tp_pmu__have_event(struct perf_pmu *pmu __maybe_unused, const char *name) 191 { 192 char *dup_name, *colon; 193 int id; 194 195 colon = strchr(name, ':'); 196 if (colon == NULL) 197 return false; 198 199 dup_name = strdup(name); 200 if (!dup_name) 201 return false; 202 203 colon = dup_name + (colon - name); 204 *colon = '\0'; 205 id = tp_pmu__id(dup_name, colon + 1); 206 free(dup_name); 207 return id >= 0; 208 } 209