| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2 only, |
| 7 | * as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #define _LGPL_SOURCE |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | #include <urcu/list.h> |
| 25 | |
| 26 | #include <common/error.h> |
| 27 | #include <common/sessiond-comm/sessiond-comm.h> |
| 28 | |
| 29 | #include "context.h" |
| 30 | #include "kernel.h" |
| 31 | #include "ust-app.h" |
| 32 | #include "trace-ust.h" |
| 33 | #include "agent.h" |
| 34 | |
| 35 | /* |
| 36 | * Add kernel context to all channel. |
| 37 | */ |
| 38 | static int add_kctx_all_channels(struct ltt_kernel_session *ksession, |
| 39 | struct ltt_kernel_context *kctx) |
| 40 | { |
| 41 | int ret; |
| 42 | struct ltt_kernel_channel *kchan; |
| 43 | |
| 44 | assert(ksession); |
| 45 | assert(kctx); |
| 46 | |
| 47 | DBG("Adding kernel context to all channels"); |
| 48 | |
| 49 | /* Go over all channels */ |
| 50 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
| 51 | ret = kernel_add_channel_context(kchan, kctx); |
| 52 | if (ret < 0) { |
| 53 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; |
| 54 | goto error; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | ret = LTTNG_OK; |
| 59 | |
| 60 | error: |
| 61 | return ret; |
| 62 | } |
| 63 | |
| 64 | /* |
| 65 | * Add kernel context to a specific channel. |
| 66 | */ |
| 67 | static int add_kctx_to_channel(struct ltt_kernel_context *kctx, |
| 68 | struct ltt_kernel_channel *kchan) |
| 69 | { |
| 70 | int ret; |
| 71 | |
| 72 | assert(kchan); |
| 73 | assert(kctx); |
| 74 | |
| 75 | DBG("Add kernel context to channel '%s'", kchan->channel->name); |
| 76 | |
| 77 | ret = kernel_add_channel_context(kchan, kctx); |
| 78 | if (ret < 0) { |
| 79 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; |
| 80 | goto error; |
| 81 | } |
| 82 | |
| 83 | ret = LTTNG_OK; |
| 84 | |
| 85 | error: |
| 86 | return ret; |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Add UST context to channel. |
| 91 | */ |
| 92 | static int add_uctx_to_channel(struct ltt_ust_session *usess, |
| 93 | enum lttng_domain_type domain, |
| 94 | struct ltt_ust_channel *uchan, struct lttng_event_context *ctx) |
| 95 | { |
| 96 | int ret; |
| 97 | struct ltt_ust_context *uctx = NULL; |
| 98 | |
| 99 | assert(usess); |
| 100 | assert(uchan); |
| 101 | assert(ctx); |
| 102 | |
| 103 | /* Check if context is duplicate */ |
| 104 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
| 105 | if (trace_ust_match_context(uctx, ctx)) { |
| 106 | ret = -EEXIST; |
| 107 | goto duplicate; |
| 108 | } |
| 109 | } |
| 110 | uctx = NULL; |
| 111 | |
| 112 | switch (domain) { |
| 113 | case LTTNG_DOMAIN_JUL: |
| 114 | case LTTNG_DOMAIN_LOG4J: |
| 115 | { |
| 116 | struct agent *agt; |
| 117 | |
| 118 | if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
| 119 | /* Other contexts are not needed by the agent. */ |
| 120 | break; |
| 121 | } |
| 122 | agt = trace_ust_find_agent(usess, domain); |
| 123 | |
| 124 | if (!agt) { |
| 125 | agt = agent_create(domain); |
| 126 | if (!agt) { |
| 127 | ret = LTTNG_ERR_NOMEM; |
| 128 | goto error; |
| 129 | } |
| 130 | agent_add(agt, usess->agents); |
| 131 | } |
| 132 | ret = agent_add_context(ctx, agt); |
| 133 | if (ret != LTTNG_OK) { |
| 134 | goto error; |
| 135 | } |
| 136 | |
| 137 | ret = agent_enable_context(ctx, domain); |
| 138 | if (ret != LTTNG_OK) { |
| 139 | goto error; |
| 140 | } |
| 141 | break; |
| 142 | } |
| 143 | case LTTNG_DOMAIN_UST: |
| 144 | break; |
| 145 | default: |
| 146 | assert(0); |
| 147 | } |
| 148 | |
| 149 | /* Create ltt UST context */ |
| 150 | uctx = trace_ust_create_context(ctx); |
| 151 | if (uctx == NULL) { |
| 152 | ret = -EINVAL; |
| 153 | goto error; |
| 154 | } |
| 155 | |
| 156 | ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx); |
| 157 | if (ret < 0) { |
| 158 | goto error; |
| 159 | } |
| 160 | |
| 161 | rcu_read_lock(); |
| 162 | |
| 163 | /* Add ltt UST context node to ltt UST channel */ |
| 164 | lttng_ht_add_ulong(uchan->ctx, &uctx->node); |
| 165 | rcu_read_unlock(); |
| 166 | cds_list_add_tail(&uctx->list, &uchan->ctx_list); |
| 167 | |
| 168 | DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name); |
| 169 | |
| 170 | return 0; |
| 171 | |
| 172 | error: |
| 173 | free(uctx); |
| 174 | duplicate: |
| 175 | return ret; |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * Add kernel context to tracer. |
| 180 | */ |
| 181 | int context_kernel_add(struct ltt_kernel_session *ksession, |
| 182 | struct lttng_event_context *ctx, char *channel_name) |
| 183 | { |
| 184 | int ret; |
| 185 | struct ltt_kernel_channel *kchan; |
| 186 | struct ltt_kernel_context *kctx; |
| 187 | |
| 188 | assert(ksession); |
| 189 | assert(ctx); |
| 190 | assert(channel_name); |
| 191 | |
| 192 | kctx = trace_kernel_create_context(NULL); |
| 193 | if (!kctx) { |
| 194 | ret = LTTNG_ERR_NOMEM; |
| 195 | goto error; |
| 196 | } |
| 197 | |
| 198 | /* Setup kernel context structure */ |
| 199 | switch (ctx->ctx) { |
| 200 | case LTTNG_EVENT_CONTEXT_PID: |
| 201 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID; |
| 202 | break; |
| 203 | case LTTNG_EVENT_CONTEXT_PROCNAME: |
| 204 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME; |
| 205 | break; |
| 206 | case LTTNG_EVENT_CONTEXT_PRIO: |
| 207 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO; |
| 208 | break; |
| 209 | case LTTNG_EVENT_CONTEXT_NICE: |
| 210 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NICE; |
| 211 | break; |
| 212 | case LTTNG_EVENT_CONTEXT_VPID: |
| 213 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPID; |
| 214 | break; |
| 215 | case LTTNG_EVENT_CONTEXT_TID: |
| 216 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TID; |
| 217 | break; |
| 218 | case LTTNG_EVENT_CONTEXT_VTID: |
| 219 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VTID; |
| 220 | break; |
| 221 | case LTTNG_EVENT_CONTEXT_PPID: |
| 222 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PPID; |
| 223 | break; |
| 224 | case LTTNG_EVENT_CONTEXT_VPPID: |
| 225 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID; |
| 226 | break; |
| 227 | case LTTNG_EVENT_CONTEXT_HOSTNAME: |
| 228 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME; |
| 229 | break; |
| 230 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: |
| 231 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: |
| 232 | kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER; |
| 233 | break; |
| 234 | default: |
| 235 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; |
| 236 | goto error; |
| 237 | } |
| 238 | |
| 239 | kctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type; |
| 240 | kctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config; |
| 241 | strncpy(kctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name, |
| 242 | LTTNG_SYMBOL_NAME_LEN); |
| 243 | kctx->ctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 244 | |
| 245 | if (*channel_name == '\0') { |
| 246 | ret = add_kctx_all_channels(ksession, kctx); |
| 247 | if (ret != LTTNG_OK) { |
| 248 | goto error; |
| 249 | } |
| 250 | } else { |
| 251 | /* Get kernel channel */ |
| 252 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
| 253 | if (kchan == NULL) { |
| 254 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
| 255 | goto error; |
| 256 | } |
| 257 | |
| 258 | ret = add_kctx_to_channel(kctx, kchan); |
| 259 | if (ret != LTTNG_OK) { |
| 260 | goto error; |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | return LTTNG_OK; |
| 265 | |
| 266 | error: |
| 267 | if (kctx) { |
| 268 | trace_kernel_destroy_context(kctx); |
| 269 | } |
| 270 | return ret; |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Add UST context to tracer. |
| 275 | */ |
| 276 | int context_ust_add(struct ltt_ust_session *usess, |
| 277 | enum lttng_domain_type domain, struct lttng_event_context *ctx, |
| 278 | char *channel_name) |
| 279 | { |
| 280 | int ret = LTTNG_OK; |
| 281 | struct lttng_ht_iter iter; |
| 282 | struct lttng_ht *chan_ht; |
| 283 | struct ltt_ust_channel *uchan = NULL; |
| 284 | |
| 285 | assert(usess); |
| 286 | assert(ctx); |
| 287 | assert(channel_name); |
| 288 | |
| 289 | rcu_read_lock(); |
| 290 | |
| 291 | chan_ht = usess->domain_global.channels; |
| 292 | |
| 293 | /* Get UST channel if defined */ |
| 294 | if (channel_name[0] != '\0') { |
| 295 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); |
| 296 | if (uchan == NULL) { |
| 297 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 298 | goto error; |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | if (uchan) { |
| 303 | /* Add ctx to channel */ |
| 304 | ret = add_uctx_to_channel(usess, domain, uchan, ctx); |
| 305 | } else { |
| 306 | rcu_read_lock(); |
| 307 | /* Add ctx all events, all channels */ |
| 308 | cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) { |
| 309 | ret = add_uctx_to_channel(usess, domain, uchan, ctx); |
| 310 | if (ret < 0) { |
| 311 | ERR("Failed to add context to channel %s", |
| 312 | uchan->name); |
| 313 | continue; |
| 314 | } |
| 315 | } |
| 316 | rcu_read_unlock(); |
| 317 | } |
| 318 | |
| 319 | switch (ret) { |
| 320 | case -EEXIST: |
| 321 | ret = LTTNG_ERR_UST_CONTEXT_EXIST; |
| 322 | break; |
| 323 | case -ENOMEM: |
| 324 | ret = LTTNG_ERR_FATAL; |
| 325 | break; |
| 326 | case -EINVAL: |
| 327 | ret = LTTNG_ERR_UST_CONTEXT_INVAL; |
| 328 | break; |
| 329 | case -ENOSYS: |
| 330 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 331 | break; |
| 332 | default: |
| 333 | ret = LTTNG_OK; |
| 334 | break; |
| 335 | } |
| 336 | |
| 337 | error: |
| 338 | rcu_read_unlock(); |
| 339 | return ret; |
| 340 | } |