tools/perf/util/cs-etm-decoder/cs-etm-decoder.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright(C) 2015-2018 Linaro Limited.
   4  *
   5  * Author: Tor Jeremiassen <tor@ti.com>
   6  * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/list.h>
  11 #include <stdlib.h>
  12 #include <opencsd/c_api/opencsd_c_api.h>
  13 #include <opencsd/etmv4/trc_pkt_types_etmv4.h>
  14 #include <opencsd/ocsd_if_types.h>
  15
  16 #include "cs-etm.h"
  17 #include "cs-etm-decoder.h"
  18 #include "intlist.h"
  19 #include "util.h"
  20
  21 #define MAX_BUFFER 1024
  22
  23 /* use raw logging */
  24 #ifdef CS_DEBUG_RAW
  25 #define CS_LOG_RAW_FRAMES
  26 #ifdef CS_RAW_PACKED
  27 #define CS_RAW_DEBUG_FLAGS (OCSD_DFRMTR_UNPACKED_RAW_OUT | \
  28                             OCSD_DFRMTR_PACKED_RAW_OUT)
  29 #else
  30 #define CS_RAW_DEBUG_FLAGS (OCSD_DFRMTR_UNPACKED_RAW_OUT)
  31 #endif
  32 #endif
  33
  34 #define CS_ETM_INVAL_ADDR       0xdeadbeefdeadbeefUL
  35
  36 struct cs_etm_decoder {
  37         void *data;
  38         void (*packet_printer)(const char *msg);
  39         dcd_tree_handle_t dcd_tree;
  40         cs_etm_mem_cb_type mem_access;
  41         ocsd_datapath_resp_t prev_return;
  42         u32 packet_count;
  43         u32 head;
  44         u32 tail;
  45         struct cs_etm_packet packet_buffer[MAX_BUFFER];
  46 };
  47
  48 static u32
  49 cs_etm_decoder__mem_access(const void *context,
  50                            const ocsd_vaddr_t address,
  51                            const ocsd_mem_space_acc_t mem_space __maybe_unused,
  52                            const u32 req_size,
  53                            u8 *buffer)
  54 {
  55         struct cs_etm_decoder *decoder = (struct cs_etm_decoder *) context;
  56
  57         return decoder->mem_access(decoder->data,
  58                                    address,
  59                                    req_size,
  60                                    buffer);
  61 }
  62
  63 int cs_etm_decoder__add_mem_access_cb(struct cs_etm_decoder *decoder,
  64                                       u64 start, u64 end,
  65                                       cs_etm_mem_cb_type cb_func)
  66 {
  67         decoder->mem_access = cb_func;
  68
  69         if (ocsd_dt_add_callback_mem_acc(decoder->dcd_tree, start, end,
  70                                          OCSD_MEM_SPACE_ANY,
  71                                          cs_etm_decoder__mem_access, decoder))
  72                 return -1;
  73
  74         return 0;
  75 }
  76
  77 int cs_etm_decoder__reset(struct cs_etm_decoder *decoder)
  78 {
  79         ocsd_datapath_resp_t dp_ret;
  80
  81         decoder->prev_return = OCSD_RESP_CONT;
  82
  83         dp_ret = ocsd_dt_process_data(decoder->dcd_tree, OCSD_OP_RESET,
  84                                       0, 0, NULL, NULL);
  85         if (OCSD_DATA_RESP_IS_FATAL(dp_ret))
  86                 return -1;
  87
  88         return 0;
  89 }
  90
  91 int cs_etm_decoder__get_packet(struct cs_etm_decoder *decoder,
  92                                struct cs_etm_packet *packet)
  93 {
  94         if (!decoder || !packet)
  95                 return -EINVAL;
  96
  97         /* Nothing to do, might as well just return */
  98         if (decoder->packet_count == 0)
  99                 return 0;
 100         /*
 101          * The queueing process in function cs_etm_decoder__buffer_packet()
 102          * increments the tail *before* using it.  This is somewhat counter
 103          * intuitive but it has the advantage of centralizing tail management
 104          * at a single location.  Because of that we need to follow the same
 105          * heuristic with the head, i.e we increment it before using its
 106          * value.  Otherwise the first element of the packet queue is not
 107          * used.
 108          */
 109         decoder->head = (decoder->head + 1) & (MAX_BUFFER - 1);
 110
 111         *packet = decoder->packet_buffer[decoder->head];
 112
 113         decoder->packet_count--;
 114
 115         return 1;
 116 }
 117
 118 static int cs_etm_decoder__gen_etmv3_config(struct cs_etm_trace_params *params,
 119                                             ocsd_etmv3_cfg *config)
 120 {
 121         config->reg_idr = params->etmv3.reg_idr;
 122         config->reg_ctrl = params->etmv3.reg_ctrl;
 123         config->reg_ccer = params->etmv3.reg_ccer;
 124         config->reg_trc_id = params->etmv3.reg_trc_id;
 125         config->arch_ver = ARCH_V7;
 126         config->core_prof = profile_CortexA;
 127
 128         return 0;
 129 }
 130
 131 static void cs_etm_decoder__gen_etmv4_config(struct cs_etm_trace_params *params,
 132                                              ocsd_etmv4_cfg *config)
 133 {
 134         config->reg_configr = params->etmv4.reg_configr;
 135         config->reg_traceidr = params->etmv4.reg_traceidr;
 136         config->reg_idr0 = params->etmv4.reg_idr0;
 137         config->reg_idr1 = params->etmv4.reg_idr1;
 138         config->reg_idr2 = params->etmv4.reg_idr2;
 139         config->reg_idr8 = params->etmv4.reg_idr8;
 140         config->reg_idr9 = 0;
 141         config->reg_idr10 = 0;
 142         config->reg_idr11 = 0;
 143         config->reg_idr12 = 0;
 144         config->reg_idr13 = 0;
 145         config->arch_ver = ARCH_V8;
 146         config->core_prof = profile_CortexA;
 147 }
 148
 149 static void cs_etm_decoder__print_str_cb(const void *p_context,
 150                                          const char *msg,
 151                                          const int str_len)
 152 {
 153         if (p_context && str_len)
 154                 ((struct cs_etm_decoder *)p_context)->packet_printer(msg);
 155 }
 156
 157 static int
 158 cs_etm_decoder__init_def_logger_printing(struct cs_etm_decoder_params *d_params,
 159                                          struct cs_etm_decoder *decoder)
 160 {
 161         int ret = 0;
 162
 163         if (d_params->packet_printer == NULL)
 164                 return -1;
 165
 166         decoder->packet_printer = d_params->packet_printer;
 167
 168         /*
 169          * Set up a library default logger to process any printers
 170          * (packet/raw frame) we add later.
 171          */
 172         ret = ocsd_def_errlog_init(OCSD_ERR_SEV_ERROR, 1);
 173         if (ret != 0)
 174                 return -1;
 175
 176         /* no stdout / err / file output */
 177         ret = ocsd_def_errlog_config_output(C_API_MSGLOGOUT_FLG_NONE, NULL);
 178         if (ret != 0)
 179                 return -1;
 180
 181         /*
 182          * Set the string CB for the default logger, passes strings to
 183          * perf print logger.
 184          */
 185         ret = ocsd_def_errlog_set_strprint_cb(decoder->dcd_tree,
 186                                               (void *)decoder,
 187                                               cs_etm_decoder__print_str_cb);
 188         if (ret != 0)
 189                 ret = -1;
 190
 191         return 0;
 192 }
 193
 194 #ifdef CS_LOG_RAW_FRAMES
 195 static void
 196 cs_etm_decoder__init_raw_frame_logging(struct cs_etm_decoder_params *d_params,
 197                                        struct cs_etm_decoder *decoder)
 198 {
 199         /* Only log these during a --dump operation */
 200         if (d_params->operation == CS_ETM_OPERATION_PRINT) {
 201                 /* set up a library default logger to process the
 202                  *  raw frame printer we add later
 203                  */
 204                 ocsd_def_errlog_init(OCSD_ERR_SEV_ERROR, 1);
 205
 206                 /* no stdout / err / file output */
 207                 ocsd_def_errlog_config_output(C_API_MSGLOGOUT_FLG_NONE, NULL);
 208
 209                 /* set the string CB for the default logger,
 210                  * passes strings to perf print logger.
 211                  */
 212                 ocsd_def_errlog_set_strprint_cb(decoder->dcd_tree,
 213                                                 (void *)decoder,
 214                                                 cs_etm_decoder__print_str_cb);
 215
 216                 /* use the built in library printer for the raw frames */
 217                 ocsd_dt_set_raw_frame_printer(decoder->dcd_tree,
 218                                               CS_RAW_DEBUG_FLAGS);
 219         }
 220 }
 221 #else
 222 static void
 223 cs_etm_decoder__init_raw_frame_logging(
 224                 struct cs_etm_decoder_params *d_params __maybe_unused,
 225                 struct cs_etm_decoder *decoder __maybe_unused)
 226 {
 227 }
 228 #endif
 229
 230 static int cs_etm_decoder__create_packet_printer(struct cs_etm_decoder *decoder,
 231                                                  const char *decoder_name,
 232                                                  void *trace_config)
 233 {
 234         u8 csid;
 235
 236         if (ocsd_dt_create_decoder(decoder->dcd_tree, decoder_name,
 237                                    OCSD_CREATE_FLG_PACKET_PROC,
 238                                    trace_config, &csid))
 239                 return -1;
 240
 241         if (ocsd_dt_set_pkt_protocol_printer(decoder->dcd_tree, csid, 0))
 242                 return -1;
 243
 244         return 0;
 245 }
 246
 247 static int
 248 cs_etm_decoder__create_etm_packet_printer(struct cs_etm_trace_params *t_params,
 249                                           struct cs_etm_decoder *decoder)
 250 {
 251         const char *decoder_name;
 252         ocsd_etmv3_cfg config_etmv3;
 253         ocsd_etmv4_cfg trace_config_etmv4;
 254         void *trace_config;
 255
 256         switch (t_params->protocol) {
 257         case CS_ETM_PROTO_ETMV3:
 258         case CS_ETM_PROTO_PTM:
 259                 cs_etm_decoder__gen_etmv3_config(t_params, &config_etmv3);
 260                 decoder_name = (t_params->protocol == CS_ETM_PROTO_ETMV3) ?
 261                                                         OCSD_BUILTIN_DCD_ETMV3 :
 262                                                         OCSD_BUILTIN_DCD_PTM;
 263                 trace_config = &config_etmv3;
 264                 break;
 265         case CS_ETM_PROTO_ETMV4i:
 266                 cs_etm_decoder__gen_etmv4_config(t_params, &trace_config_etmv4);
 267                 decoder_name = OCSD_BUILTIN_DCD_ETMV4I;
 268                 trace_config = &trace_config_etmv4;
 269                 break;
 270         default:
 271                 return -1;
 272         }
 273
 274         return cs_etm_decoder__create_packet_printer(decoder,
 275                                                      decoder_name,
 276                                                      trace_config);
 277 }
 278
 279 static void cs_etm_decoder__clear_buffer(struct cs_etm_decoder *decoder)
 280 {
 281         int i;
 282
 283         decoder->head = 0;
 284         decoder->tail = 0;
 285         decoder->packet_count = 0;
 286         for (i = 0; i < MAX_BUFFER; i++) {
 287                 decoder->packet_buffer[i].isa = CS_ETM_ISA_UNKNOWN;
 288                 decoder->packet_buffer[i].start_addr = CS_ETM_INVAL_ADDR;
 289                 decoder->packet_buffer[i].end_addr = CS_ETM_INVAL_ADDR;
 290                 decoder->packet_buffer[i].instr_count = 0;
 291                 decoder->packet_buffer[i].last_instr_taken_branch = false;
 292                 decoder->packet_buffer[i].last_instr_size = 0;
 293                 decoder->packet_buffer[i].exc = false;
 294                 decoder->packet_buffer[i].exc_ret = false;
 295                 decoder->packet_buffer[i].cpu = INT_MIN;
 296         }
 297 }
 298
 299 static ocsd_datapath_resp_t
 300 cs_etm_decoder__buffer_packet(struct cs_etm_decoder *decoder,
 301                               const u8 trace_chan_id,
 302                               enum cs_etm_sample_type sample_type)
 303 {
 304         u32 et = 0;
 305         struct int_node *inode = NULL;
 306
 307         if (decoder->packet_count >= MAX_BUFFER - 1)
 308                 return OCSD_RESP_FATAL_SYS_ERR;
 309
 310         /* Search the RB tree for the cpu associated with this traceID */
 311         inode = intlist__find(traceid_list, trace_chan_id);
 312         if (!inode)
 313                 return OCSD_RESP_FATAL_SYS_ERR;
 314
 315         et = decoder->tail;
 316         et = (et + 1) & (MAX_BUFFER - 1);
 317         decoder->tail = et;
 318         decoder->packet_count++;
 319
 320         decoder->packet_buffer[et].sample_type = sample_type;
 321         decoder->packet_buffer[et].isa = CS_ETM_ISA_UNKNOWN;
 322         decoder->packet_buffer[et].exc = false;
 323         decoder->packet_buffer[et].exc_ret = false;
 324         decoder->packet_buffer[et].cpu = *((int *)inode->priv);
 325         decoder->packet_buffer[et].start_addr = CS_ETM_INVAL_ADDR;
 326         decoder->packet_buffer[et].end_addr = CS_ETM_INVAL_ADDR;
 327         decoder->packet_buffer[et].instr_count = 0;
 328         decoder->packet_buffer[et].last_instr_taken_branch = false;
 329         decoder->packet_buffer[et].last_instr_size = 0;
 330
 331         if (decoder->packet_count == MAX_BUFFER - 1)
 332                 return OCSD_RESP_WAIT;
 333
 334         return OCSD_RESP_CONT;
 335 }
 336
 337 static ocsd_datapath_resp_t
 338 cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder,
 339                              const ocsd_generic_trace_elem *elem,
 340                              const uint8_t trace_chan_id)
 341 {
 342         int ret = 0;
 343         struct cs_etm_packet *packet;
 344
 345         ret = cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
 346                                             CS_ETM_RANGE);
 347         if (ret != OCSD_RESP_CONT && ret != OCSD_RESP_WAIT)
 348                 return ret;
 349
 350         packet = &decoder->packet_buffer[decoder->tail];
 351
 352         switch (elem->isa) {
 353         case ocsd_isa_aarch64:
 354                 packet->isa = CS_ETM_ISA_A64;
 355                 break;
 356         case ocsd_isa_arm:
 357                 packet->isa = CS_ETM_ISA_A32;
 358                 break;
 359         case ocsd_isa_thumb2:
 360                 packet->isa = CS_ETM_ISA_T32;
 361                 break;
 362         case ocsd_isa_tee:
 363         case ocsd_isa_jazelle:
 364         case ocsd_isa_custom:
 365         case ocsd_isa_unknown:
 366         default:
 367                 packet->isa = CS_ETM_ISA_UNKNOWN;
 368         }
 369
 370         packet->start_addr = elem->st_addr;
 371         packet->end_addr = elem->en_addr;
 372         packet->instr_count = elem->num_instr_range;
 373
 374         switch (elem->last_i_type) {
 375         case OCSD_INSTR_BR:
 376         case OCSD_INSTR_BR_INDIRECT:
 377                 packet->last_instr_taken_branch = elem->last_instr_exec;
 378                 break;
 379         case OCSD_INSTR_ISB:
 380         case OCSD_INSTR_DSB_DMB:
 381         case OCSD_INSTR_OTHER:
 382         default:
 383                 packet->last_instr_taken_branch = false;
 384                 break;
 385         }
 386
 387         packet->last_instr_size = elem->last_instr_sz;
 388
 389         return ret;
 390 }
 391
 392 static ocsd_datapath_resp_t
 393 cs_etm_decoder__buffer_discontinuity(struct cs_etm_decoder *decoder,
 394                                            const uint8_t trace_chan_id)
 395 {
 396         return cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
 397                                              CS_ETM_DISCONTINUITY);
 398 }
 399
 400 static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
 401                                 const void *context,
 402                                 const ocsd_trc_index_t indx __maybe_unused,
 403                                 const u8 trace_chan_id __maybe_unused,
 404                                 const ocsd_generic_trace_elem *elem)
 405 {
 406         ocsd_datapath_resp_t resp = OCSD_RESP_CONT;
 407         struct cs_etm_decoder *decoder = (struct cs_etm_decoder *) context;
 408
 409         switch (elem->elem_type) {
 410         case OCSD_GEN_TRC_ELEM_UNKNOWN:
 411                 break;
 412         case OCSD_GEN_TRC_ELEM_NO_SYNC:
 413                 break;
 414         case OCSD_GEN_TRC_ELEM_TRACE_ON:
 415                 resp = cs_etm_decoder__buffer_discontinuity(decoder,
 416                                                             trace_chan_id);
 417                 break;
 418         case OCSD_GEN_TRC_ELEM_INSTR_RANGE:
 419                 resp = cs_etm_decoder__buffer_range(decoder, elem,
 420                                                     trace_chan_id);
 421                 break;
 422         case OCSD_GEN_TRC_ELEM_EXCEPTION:
 423                 decoder->packet_buffer[decoder->tail].exc = true;
 424                 break;
 425         case OCSD_GEN_TRC_ELEM_EXCEPTION_RET:
 426                 decoder->packet_buffer[decoder->tail].exc_ret = true;
 427                 break;
 428         case OCSD_GEN_TRC_ELEM_PE_CONTEXT:
 429         case OCSD_GEN_TRC_ELEM_EO_TRACE:
 430         case OCSD_GEN_TRC_ELEM_ADDR_NACC:
 431         case OCSD_GEN_TRC_ELEM_TIMESTAMP:
 432         case OCSD_GEN_TRC_ELEM_CYCLE_COUNT:
 433         case OCSD_GEN_TRC_ELEM_ADDR_UNKNOWN:
 434         case OCSD_GEN_TRC_ELEM_EVENT:
 435         case OCSD_GEN_TRC_ELEM_SWTRACE:
 436         case OCSD_GEN_TRC_ELEM_CUSTOM:
 437         default:
 438                 break;
 439         }
 440
 441         return resp;
 442 }
 443
 444 static int cs_etm_decoder__create_etm_packet_decoder(
 445                                         struct cs_etm_trace_params *t_params,
 446                                         struct cs_etm_decoder *decoder)
 447 {
 448         const char *decoder_name;
 449         ocsd_etmv3_cfg config_etmv3;
 450         ocsd_etmv4_cfg trace_config_etmv4;
 451         void *trace_config;
 452         u8 csid;
 453
 454         switch (t_params->protocol) {
 455         case CS_ETM_PROTO_ETMV3:
 456         case CS_ETM_PROTO_PTM:
 457                 cs_etm_decoder__gen_etmv3_config(t_params, &config_etmv3);
 458                 decoder_name = (t_params->protocol == CS_ETM_PROTO_ETMV3) ?
 459                                                         OCSD_BUILTIN_DCD_ETMV3 :
 460                                                         OCSD_BUILTIN_DCD_PTM;
 461                 trace_config = &config_etmv3;
 462                 break;
 463         case CS_ETM_PROTO_ETMV4i:
 464                 cs_etm_decoder__gen_etmv4_config(t_params, &trace_config_etmv4);
 465                 decoder_name = OCSD_BUILTIN_DCD_ETMV4I;
 466                 trace_config = &trace_config_etmv4;
 467                 break;
 468         default:
 469                 return -1;
 470         }
 471
 472         if (ocsd_dt_create_decoder(decoder->dcd_tree,
 473                                      decoder_name,
 474                                      OCSD_CREATE_FLG_FULL_DECODER,
 475                                      trace_config, &csid))
 476                 return -1;
 477
 478         if (ocsd_dt_set_gen_elem_outfn(decoder->dcd_tree,
 479                                        cs_etm_decoder__gen_trace_elem_printer,
 480                                        decoder))
 481                 return -1;
 482
 483         return 0;
 484 }
 485
 486 static int
 487 cs_etm_decoder__create_etm_decoder(struct cs_etm_decoder_params *d_params,
 488                                    struct cs_etm_trace_params *t_params,
 489                                    struct cs_etm_decoder *decoder)
 490 {
 491         if (d_params->operation == CS_ETM_OPERATION_PRINT)
 492                 return cs_etm_decoder__create_etm_packet_printer(t_params,
 493                                                                  decoder);
 494         else if (d_params->operation == CS_ETM_OPERATION_DECODE)
 495                 return cs_etm_decoder__create_etm_packet_decoder(t_params,
 496                                                                  decoder);
 497
 498         return -1;
 499 }
 500
 501 struct cs_etm_decoder *
 502 cs_etm_decoder__new(int num_cpu, struct cs_etm_decoder_params *d_params,
 503                     struct cs_etm_trace_params t_params[])
 504 {
 505         struct cs_etm_decoder *decoder;
 506         ocsd_dcd_tree_src_t format;
 507         u32 flags;
 508         int i, ret;
 509
 510         if ((!t_params) || (!d_params))
 511                 return NULL;
 512
 513         decoder = zalloc(sizeof(*decoder));
 514
 515         if (!decoder)
 516                 return NULL;
 517
 518         decoder->data = d_params->data;
 519         decoder->prev_return = OCSD_RESP_CONT;
 520         cs_etm_decoder__clear_buffer(decoder);
 521         format = (d_params->formatted ? OCSD_TRC_SRC_FRAME_FORMATTED :
 522                                          OCSD_TRC_SRC_SINGLE);
 523         flags = 0;
 524         flags |= (d_params->fsyncs ? OCSD_DFRMTR_HAS_FSYNCS : 0);
 525         flags |= (d_params->hsyncs ? OCSD_DFRMTR_HAS_HSYNCS : 0);
 526         flags |= (d_params->frame_aligned ? OCSD_DFRMTR_FRAME_MEM_ALIGN : 0);
 527
 528         /*
 529          * Drivers may add barrier frames when used with perf, set up to
 530          * handle this. Barriers const of FSYNC packet repeated 4 times.
 531          */
 532         flags |= OCSD_DFRMTR_RESET_ON_4X_FSYNC;
 533
 534         /* Create decode tree for the data source */
 535         decoder->dcd_tree = ocsd_create_dcd_tree(format, flags);
 536
 537         if (decoder->dcd_tree == 0)
 538                 goto err_free_decoder;
 539
 540         /* init library print logging support */
 541         ret = cs_etm_decoder__init_def_logger_printing(d_params, decoder);
 542         if (ret != 0)
 543                 goto err_free_decoder_tree;
 544
 545         /* init raw frame logging if required */
 546         cs_etm_decoder__init_raw_frame_logging(d_params, decoder);
 547
 548         for (i = 0; i < num_cpu; i++) {
 549                 ret = cs_etm_decoder__create_etm_decoder(d_params,
 550                                                          &t_params[i],
 551                                                          decoder);
 552                 if (ret != 0)
 553                         goto err_free_decoder_tree;
 554         }
 555
 556         return decoder;
 557
 558 err_free_decoder_tree:
 559         ocsd_destroy_dcd_tree(decoder->dcd_tree);
 560 err_free_decoder:
 561         free(decoder);
 562         return NULL;
 563 }
 564
 565 int cs_etm_decoder__process_data_block(struct cs_etm_decoder *decoder,
 566                                        u64 indx, const u8 *buf,
 567                                        size_t len, size_t *consumed)
 568 {
 569         int ret = 0;
 570         ocsd_datapath_resp_t cur = OCSD_RESP_CONT;
 571         ocsd_datapath_resp_t prev_return = decoder->prev_return;
 572         size_t processed = 0;
 573         u32 count;
 574
 575         while (processed < len) {
 576                 if (OCSD_DATA_RESP_IS_WAIT(prev_return)) {
 577                         cur = ocsd_dt_process_data(decoder->dcd_tree,
 578                                                    OCSD_OP_FLUSH,
 579                                                    0,
 580                                                    0,
 581                                                    NULL,
 582                                                    NULL);
 583                 } else if (OCSD_DATA_RESP_IS_CONT(prev_return)) {
 584                         cur = ocsd_dt_process_data(decoder->dcd_tree,
 585                                                    OCSD_OP_DATA,
 586                                                    indx + processed,
 587                                                    len - processed,
 588                                                    &buf[processed],
 589                                                    &count);
 590                         processed += count;
 591                 } else {
 592                         ret = -EINVAL;
 593                         break;
 594                 }
 595
 596                 /*
 597                  * Return to the input code if the packet buffer is full.
 598                  * Flushing will get done once the packet buffer has been
 599                  * processed.
 600                  */
 601                 if (OCSD_DATA_RESP_IS_WAIT(cur))
 602                         break;
 603
 604                 prev_return = cur;
 605         }
 606
 607         decoder->prev_return = cur;
 608         *consumed = processed;
 609
 610         return ret;
 611 }
 612
 613 void cs_etm_decoder__free(struct cs_etm_decoder *decoder)
 614 {
 615         if (!decoder)
 616                 return;
 617
 618         ocsd_destroy_dcd_tree(decoder->dcd_tree);
 619         decoder->dcd_tree = NULL;
 620         free(decoder);
 621 }