12025cf9eSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 200447ccdSAdrian Hunter /* 300447ccdSAdrian Hunter * thread-stack.c: Synthesize a thread's stack using call / return events 400447ccdSAdrian Hunter * Copyright (c) 2014, Intel Corporation. 500447ccdSAdrian Hunter */ 600447ccdSAdrian Hunter 792a9e4f7SAdrian Hunter #include <linux/rbtree.h> 892a9e4f7SAdrian Hunter #include <linux/list.h> 9256d92bcSAdrian Hunter #include <linux/log2.h> 107f7c536fSArnaldo Carvalho de Melo #include <linux/zalloc.h> 11a43783aeSArnaldo Carvalho de Melo #include <errno.h> 12215a0d30SArnaldo Carvalho de Melo #include <stdlib.h> 138520a98dSArnaldo Carvalho de Melo #include <string.h> 1400447ccdSAdrian Hunter #include "thread.h" 1500447ccdSAdrian Hunter #include "event.h" 1692a9e4f7SAdrian Hunter #include "machine.h" 173c0cd952SAdrian Hunter #include "env.h" 1800447ccdSAdrian Hunter #include "debug.h" 1992a9e4f7SAdrian Hunter #include "symbol.h" 2092a9e4f7SAdrian Hunter #include "comm.h" 21451db126SChris Phlipot #include "call-path.h" 2200447ccdSAdrian Hunter #include "thread-stack.h" 2300447ccdSAdrian Hunter 2492a9e4f7SAdrian Hunter #define STACK_GROWTH 2048 2592a9e4f7SAdrian Hunter 263c0cd952SAdrian Hunter /* 273c0cd952SAdrian Hunter * State of retpoline detection. 283c0cd952SAdrian Hunter * 293c0cd952SAdrian Hunter * RETPOLINE_NONE: no retpoline detection 303c0cd952SAdrian Hunter * X86_RETPOLINE_POSSIBLE: x86 retpoline possible 313c0cd952SAdrian Hunter * X86_RETPOLINE_DETECTED: x86 retpoline detected 323c0cd952SAdrian Hunter */ 333c0cd952SAdrian Hunter enum retpoline_state_t { 343c0cd952SAdrian Hunter RETPOLINE_NONE, 353c0cd952SAdrian Hunter X86_RETPOLINE_POSSIBLE, 363c0cd952SAdrian Hunter X86_RETPOLINE_DETECTED, 373c0cd952SAdrian Hunter }; 383c0cd952SAdrian Hunter 3992a9e4f7SAdrian Hunter /** 4092a9e4f7SAdrian Hunter * struct thread_stack_entry - thread stack entry. 4192a9e4f7SAdrian Hunter * @ret_addr: return address 4292a9e4f7SAdrian Hunter * @timestamp: timestamp (if known) 4392a9e4f7SAdrian Hunter * @ref: external reference (e.g. db_id of sample) 4492a9e4f7SAdrian Hunter * @branch_count: the branch count when the entry was created 45003ccdc7SAdrian Hunter * @insn_count: the instruction count when the entry was created 46003ccdc7SAdrian Hunter * @cyc_count the cycle count when the entry was created 47f435887eSAdrian Hunter * @db_id: id used for db-export 4892a9e4f7SAdrian Hunter * @cp: call path 4992a9e4f7SAdrian Hunter * @no_call: a 'call' was not seen 504d60e5e3SAdrian Hunter * @trace_end: a 'call' but trace ended 51f08046cbSAdrian Hunter * @non_call: a branch but not a 'call' to the start of a different symbol 5292a9e4f7SAdrian Hunter */ 5392a9e4f7SAdrian Hunter struct thread_stack_entry { 5492a9e4f7SAdrian Hunter u64 ret_addr; 5592a9e4f7SAdrian Hunter u64 timestamp; 5692a9e4f7SAdrian Hunter u64 ref; 5792a9e4f7SAdrian Hunter u64 branch_count; 58003ccdc7SAdrian Hunter u64 insn_count; 59003ccdc7SAdrian Hunter u64 cyc_count; 60f435887eSAdrian Hunter u64 db_id; 6192a9e4f7SAdrian Hunter struct call_path *cp; 6292a9e4f7SAdrian Hunter bool no_call; 634d60e5e3SAdrian Hunter bool trace_end; 64f08046cbSAdrian Hunter bool non_call; 6592a9e4f7SAdrian Hunter }; 6692a9e4f7SAdrian Hunter 6792a9e4f7SAdrian Hunter /** 6892a9e4f7SAdrian Hunter * struct thread_stack - thread stack constructed from 'call' and 'return' 6992a9e4f7SAdrian Hunter * branch samples. 7092a9e4f7SAdrian Hunter * @stack: array that holds the stack 7192a9e4f7SAdrian Hunter * @cnt: number of entries in the stack 7292a9e4f7SAdrian Hunter * @sz: current maximum stack size 7392a9e4f7SAdrian Hunter * @trace_nr: current trace number 7492a9e4f7SAdrian Hunter * @branch_count: running branch count 75003ccdc7SAdrian Hunter * @insn_count: running instruction count 76003ccdc7SAdrian Hunter * @cyc_count running cycle count 7792a9e4f7SAdrian Hunter * @kernel_start: kernel start address 7892a9e4f7SAdrian Hunter * @last_time: last timestamp 7992a9e4f7SAdrian Hunter * @crp: call/return processor 8092a9e4f7SAdrian Hunter * @comm: current comm 81f6060ac6SAdrian Hunter * @arr_sz: size of array if this is the first element of an array 823c0cd952SAdrian Hunter * @rstate: used to detect retpolines 8386d67180SAdrian Hunter * @br_stack_rb: branch stack (ring buffer) 8486d67180SAdrian Hunter * @br_stack_sz: maximum branch stack size 8586d67180SAdrian Hunter * @br_stack_pos: current position in @br_stack_rb 8686d67180SAdrian Hunter * @mispred_all: mark all branches as mispredicted 8792a9e4f7SAdrian Hunter */ 8800447ccdSAdrian Hunter struct thread_stack { 8900447ccdSAdrian Hunter struct thread_stack_entry *stack; 9000447ccdSAdrian Hunter size_t cnt; 9100447ccdSAdrian Hunter size_t sz; 9200447ccdSAdrian Hunter u64 trace_nr; 9392a9e4f7SAdrian Hunter u64 branch_count; 94003ccdc7SAdrian Hunter u64 insn_count; 95003ccdc7SAdrian Hunter u64 cyc_count; 9692a9e4f7SAdrian Hunter u64 kernel_start; 9792a9e4f7SAdrian Hunter u64 last_time; 9892a9e4f7SAdrian Hunter struct call_return_processor *crp; 9992a9e4f7SAdrian Hunter struct comm *comm; 100f6060ac6SAdrian Hunter unsigned int arr_sz; 1013c0cd952SAdrian Hunter enum retpoline_state_t rstate; 10286d67180SAdrian Hunter struct branch_stack *br_stack_rb; 10386d67180SAdrian Hunter unsigned int br_stack_sz; 10486d67180SAdrian Hunter unsigned int br_stack_pos; 10586d67180SAdrian Hunter bool mispred_all; 10600447ccdSAdrian Hunter }; 10700447ccdSAdrian Hunter 108256d92bcSAdrian Hunter /* 109256d92bcSAdrian Hunter * Assume pid == tid == 0 identifies the idle task as defined by 110256d92bcSAdrian Hunter * perf_session__register_idle_thread(). The idle task is really 1 task per cpu, 111256d92bcSAdrian Hunter * and therefore requires a stack for each cpu. 112256d92bcSAdrian Hunter */ 113256d92bcSAdrian Hunter static inline bool thread_stack__per_cpu(struct thread *thread) 114256d92bcSAdrian Hunter { 115256d92bcSAdrian Hunter return !(thread->tid || thread->pid_); 116256d92bcSAdrian Hunter } 117256d92bcSAdrian Hunter 11800447ccdSAdrian Hunter static int thread_stack__grow(struct thread_stack *ts) 11900447ccdSAdrian Hunter { 12000447ccdSAdrian Hunter struct thread_stack_entry *new_stack; 12100447ccdSAdrian Hunter size_t sz, new_sz; 12200447ccdSAdrian Hunter 12300447ccdSAdrian Hunter new_sz = ts->sz + STACK_GROWTH; 12400447ccdSAdrian Hunter sz = new_sz * sizeof(struct thread_stack_entry); 12500447ccdSAdrian Hunter 12600447ccdSAdrian Hunter new_stack = realloc(ts->stack, sz); 12700447ccdSAdrian Hunter if (!new_stack) 12800447ccdSAdrian Hunter return -ENOMEM; 12900447ccdSAdrian Hunter 13000447ccdSAdrian Hunter ts->stack = new_stack; 13100447ccdSAdrian Hunter ts->sz = new_sz; 13200447ccdSAdrian Hunter 13300447ccdSAdrian Hunter return 0; 13400447ccdSAdrian Hunter } 13500447ccdSAdrian Hunter 1362e9e8688SAdrian Hunter static int thread_stack__init(struct thread_stack *ts, struct thread *thread, 13786d67180SAdrian Hunter struct call_return_processor *crp, 13886d67180SAdrian Hunter bool callstack, unsigned int br_stack_sz) 1392e9e8688SAdrian Hunter { 1402e9e8688SAdrian Hunter int err; 1412e9e8688SAdrian Hunter 14286d67180SAdrian Hunter if (callstack) { 1432e9e8688SAdrian Hunter err = thread_stack__grow(ts); 1442e9e8688SAdrian Hunter if (err) 1452e9e8688SAdrian Hunter return err; 14686d67180SAdrian Hunter } 14786d67180SAdrian Hunter 14886d67180SAdrian Hunter if (br_stack_sz) { 14986d67180SAdrian Hunter size_t sz = sizeof(struct branch_stack); 15086d67180SAdrian Hunter 15186d67180SAdrian Hunter sz += br_stack_sz * sizeof(struct branch_entry); 15286d67180SAdrian Hunter ts->br_stack_rb = zalloc(sz); 15386d67180SAdrian Hunter if (!ts->br_stack_rb) 15486d67180SAdrian Hunter return -ENOMEM; 15586d67180SAdrian Hunter ts->br_stack_sz = br_stack_sz; 15686d67180SAdrian Hunter } 1572e9e8688SAdrian Hunter 158fe87797dSArnaldo Carvalho de Melo if (thread->maps && thread->maps->machine) { 159fe87797dSArnaldo Carvalho de Melo struct machine *machine = thread->maps->machine; 1603c0cd952SAdrian Hunter const char *arch = perf_env__arch(machine->env); 1613c0cd952SAdrian Hunter 1623c0cd952SAdrian Hunter ts->kernel_start = machine__kernel_start(machine); 1633c0cd952SAdrian Hunter if (!strcmp(arch, "x86")) 1643c0cd952SAdrian Hunter ts->rstate = X86_RETPOLINE_POSSIBLE; 1653c0cd952SAdrian Hunter } else { 1662e9e8688SAdrian Hunter ts->kernel_start = 1ULL << 63; 1673c0cd952SAdrian Hunter } 1682e9e8688SAdrian Hunter ts->crp = crp; 1692e9e8688SAdrian Hunter 1702e9e8688SAdrian Hunter return 0; 1712e9e8688SAdrian Hunter } 1722e9e8688SAdrian Hunter 173256d92bcSAdrian Hunter static struct thread_stack *thread_stack__new(struct thread *thread, int cpu, 17486d67180SAdrian Hunter struct call_return_processor *crp, 17586d67180SAdrian Hunter bool callstack, 17686d67180SAdrian Hunter unsigned int br_stack_sz) 17700447ccdSAdrian Hunter { 178139f42f3SAdrian Hunter struct thread_stack *ts = thread->ts, *new_ts; 179139f42f3SAdrian Hunter unsigned int old_sz = ts ? ts->arr_sz : 0; 180139f42f3SAdrian Hunter unsigned int new_sz = 1; 18100447ccdSAdrian Hunter 182256d92bcSAdrian Hunter if (thread_stack__per_cpu(thread) && cpu > 0) 183256d92bcSAdrian Hunter new_sz = roundup_pow_of_two(cpu + 1); 184256d92bcSAdrian Hunter 185139f42f3SAdrian Hunter if (!ts || new_sz > old_sz) { 186139f42f3SAdrian Hunter new_ts = calloc(new_sz, sizeof(*ts)); 187139f42f3SAdrian Hunter if (!new_ts) 18800447ccdSAdrian Hunter return NULL; 189139f42f3SAdrian Hunter if (ts) 190139f42f3SAdrian Hunter memcpy(new_ts, ts, old_sz * sizeof(*ts)); 191139f42f3SAdrian Hunter new_ts->arr_sz = new_sz; 192139f42f3SAdrian Hunter zfree(&thread->ts); 193139f42f3SAdrian Hunter thread->ts = new_ts; 194139f42f3SAdrian Hunter ts = new_ts; 19500447ccdSAdrian Hunter } 19600447ccdSAdrian Hunter 197256d92bcSAdrian Hunter if (thread_stack__per_cpu(thread) && cpu > 0 && 198256d92bcSAdrian Hunter (unsigned int)cpu < ts->arr_sz) 199256d92bcSAdrian Hunter ts += cpu; 200256d92bcSAdrian Hunter 201139f42f3SAdrian Hunter if (!ts->stack && 20286d67180SAdrian Hunter thread_stack__init(ts, thread, crp, callstack, br_stack_sz)) 203139f42f3SAdrian Hunter return NULL; 204bd8e68acSAdrian Hunter 20500447ccdSAdrian Hunter return ts; 20600447ccdSAdrian Hunter } 20700447ccdSAdrian Hunter 208256d92bcSAdrian Hunter static struct thread_stack *thread__cpu_stack(struct thread *thread, int cpu) 209bd8e68acSAdrian Hunter { 210256d92bcSAdrian Hunter struct thread_stack *ts = thread->ts; 211256d92bcSAdrian Hunter 212256d92bcSAdrian Hunter if (cpu < 0) 213256d92bcSAdrian Hunter cpu = 0; 214256d92bcSAdrian Hunter 215256d92bcSAdrian Hunter if (!ts || (unsigned int)cpu >= ts->arr_sz) 216256d92bcSAdrian Hunter return NULL; 217256d92bcSAdrian Hunter 218256d92bcSAdrian Hunter ts += cpu; 219256d92bcSAdrian Hunter 220256d92bcSAdrian Hunter if (!ts->stack) 221256d92bcSAdrian Hunter return NULL; 222256d92bcSAdrian Hunter 223256d92bcSAdrian Hunter return ts; 224256d92bcSAdrian Hunter } 225256d92bcSAdrian Hunter 226256d92bcSAdrian Hunter static inline struct thread_stack *thread__stack(struct thread *thread, 227256d92bcSAdrian Hunter int cpu) 228256d92bcSAdrian Hunter { 229256d92bcSAdrian Hunter if (!thread) 230256d92bcSAdrian Hunter return NULL; 231256d92bcSAdrian Hunter 232256d92bcSAdrian Hunter if (thread_stack__per_cpu(thread)) 233256d92bcSAdrian Hunter return thread__cpu_stack(thread, cpu); 234256d92bcSAdrian Hunter 235256d92bcSAdrian Hunter return thread->ts; 236bd8e68acSAdrian Hunter } 237bd8e68acSAdrian Hunter 2384d60e5e3SAdrian Hunter static int thread_stack__push(struct thread_stack *ts, u64 ret_addr, 2394d60e5e3SAdrian Hunter bool trace_end) 24000447ccdSAdrian Hunter { 24100447ccdSAdrian Hunter int err = 0; 24200447ccdSAdrian Hunter 24300447ccdSAdrian Hunter if (ts->cnt == ts->sz) { 24400447ccdSAdrian Hunter err = thread_stack__grow(ts); 24500447ccdSAdrian Hunter if (err) { 24600447ccdSAdrian Hunter pr_warning("Out of memory: discarding thread stack\n"); 24700447ccdSAdrian Hunter ts->cnt = 0; 24800447ccdSAdrian Hunter } 24900447ccdSAdrian Hunter } 25000447ccdSAdrian Hunter 2514d60e5e3SAdrian Hunter ts->stack[ts->cnt].trace_end = trace_end; 25200447ccdSAdrian Hunter ts->stack[ts->cnt++].ret_addr = ret_addr; 25300447ccdSAdrian Hunter 25400447ccdSAdrian Hunter return err; 25500447ccdSAdrian Hunter } 25600447ccdSAdrian Hunter 25700447ccdSAdrian Hunter static void thread_stack__pop(struct thread_stack *ts, u64 ret_addr) 25800447ccdSAdrian Hunter { 25900447ccdSAdrian Hunter size_t i; 26000447ccdSAdrian Hunter 26100447ccdSAdrian Hunter /* 26200447ccdSAdrian Hunter * In some cases there may be functions which are not seen to return. 26300447ccdSAdrian Hunter * For example when setjmp / longjmp has been used. Or the perf context 26400447ccdSAdrian Hunter * switch in the kernel which doesn't stop and start tracing in exactly 26500447ccdSAdrian Hunter * the same code path. When that happens the return address will be 26600447ccdSAdrian Hunter * further down the stack. If the return address is not found at all, 26700447ccdSAdrian Hunter * we assume the opposite (i.e. this is a return for a call that wasn't 26800447ccdSAdrian Hunter * seen for some reason) and leave the stack alone. 26900447ccdSAdrian Hunter */ 27000447ccdSAdrian Hunter for (i = ts->cnt; i; ) { 27100447ccdSAdrian Hunter if (ts->stack[--i].ret_addr == ret_addr) { 27200447ccdSAdrian Hunter ts->cnt = i; 27300447ccdSAdrian Hunter return; 27400447ccdSAdrian Hunter } 27500447ccdSAdrian Hunter } 27600447ccdSAdrian Hunter } 27700447ccdSAdrian Hunter 2784d60e5e3SAdrian Hunter static void thread_stack__pop_trace_end(struct thread_stack *ts) 2794d60e5e3SAdrian Hunter { 2804d60e5e3SAdrian Hunter size_t i; 2814d60e5e3SAdrian Hunter 2824d60e5e3SAdrian Hunter for (i = ts->cnt; i; ) { 2834d60e5e3SAdrian Hunter if (ts->stack[--i].trace_end) 2844d60e5e3SAdrian Hunter ts->cnt = i; 2854d60e5e3SAdrian Hunter else 2864d60e5e3SAdrian Hunter return; 2874d60e5e3SAdrian Hunter } 2884d60e5e3SAdrian Hunter } 2894d60e5e3SAdrian Hunter 29092a9e4f7SAdrian Hunter static bool thread_stack__in_kernel(struct thread_stack *ts) 29192a9e4f7SAdrian Hunter { 29292a9e4f7SAdrian Hunter if (!ts->cnt) 29392a9e4f7SAdrian Hunter return false; 29492a9e4f7SAdrian Hunter 29592a9e4f7SAdrian Hunter return ts->stack[ts->cnt - 1].cp->in_kernel; 29692a9e4f7SAdrian Hunter } 29792a9e4f7SAdrian Hunter 29892a9e4f7SAdrian Hunter static int thread_stack__call_return(struct thread *thread, 29992a9e4f7SAdrian Hunter struct thread_stack *ts, size_t idx, 30092a9e4f7SAdrian Hunter u64 timestamp, u64 ref, bool no_return) 30192a9e4f7SAdrian Hunter { 30292a9e4f7SAdrian Hunter struct call_return_processor *crp = ts->crp; 30392a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 30492a9e4f7SAdrian Hunter struct call_return cr = { 30592a9e4f7SAdrian Hunter .thread = thread, 30692a9e4f7SAdrian Hunter .comm = ts->comm, 30792a9e4f7SAdrian Hunter .db_id = 0, 30892a9e4f7SAdrian Hunter }; 309f435887eSAdrian Hunter u64 *parent_db_id; 31092a9e4f7SAdrian Hunter 31192a9e4f7SAdrian Hunter tse = &ts->stack[idx]; 31292a9e4f7SAdrian Hunter cr.cp = tse->cp; 31392a9e4f7SAdrian Hunter cr.call_time = tse->timestamp; 31492a9e4f7SAdrian Hunter cr.return_time = timestamp; 31592a9e4f7SAdrian Hunter cr.branch_count = ts->branch_count - tse->branch_count; 316003ccdc7SAdrian Hunter cr.insn_count = ts->insn_count - tse->insn_count; 317003ccdc7SAdrian Hunter cr.cyc_count = ts->cyc_count - tse->cyc_count; 318f435887eSAdrian Hunter cr.db_id = tse->db_id; 31992a9e4f7SAdrian Hunter cr.call_ref = tse->ref; 32092a9e4f7SAdrian Hunter cr.return_ref = ref; 32192a9e4f7SAdrian Hunter if (tse->no_call) 32292a9e4f7SAdrian Hunter cr.flags |= CALL_RETURN_NO_CALL; 32392a9e4f7SAdrian Hunter if (no_return) 32492a9e4f7SAdrian Hunter cr.flags |= CALL_RETURN_NO_RETURN; 325f08046cbSAdrian Hunter if (tse->non_call) 326f08046cbSAdrian Hunter cr.flags |= CALL_RETURN_NON_CALL; 32792a9e4f7SAdrian Hunter 328f435887eSAdrian Hunter /* 329f435887eSAdrian Hunter * The parent db_id must be assigned before exporting the child. Note 330f435887eSAdrian Hunter * it is not possible to export the parent first because its information 331f435887eSAdrian Hunter * is not yet complete because its 'return' has not yet been processed. 332f435887eSAdrian Hunter */ 333f435887eSAdrian Hunter parent_db_id = idx ? &(tse - 1)->db_id : NULL; 334f435887eSAdrian Hunter 335f435887eSAdrian Hunter return crp->process(&cr, parent_db_id, crp->data); 33692a9e4f7SAdrian Hunter } 33792a9e4f7SAdrian Hunter 338a5499b37SAdrian Hunter static int __thread_stack__flush(struct thread *thread, struct thread_stack *ts) 33992a9e4f7SAdrian Hunter { 34092a9e4f7SAdrian Hunter struct call_return_processor *crp = ts->crp; 34192a9e4f7SAdrian Hunter int err; 34292a9e4f7SAdrian Hunter 34392a9e4f7SAdrian Hunter if (!crp) { 34492a9e4f7SAdrian Hunter ts->cnt = 0; 34586d67180SAdrian Hunter ts->br_stack_pos = 0; 34686d67180SAdrian Hunter if (ts->br_stack_rb) 34786d67180SAdrian Hunter ts->br_stack_rb->nr = 0; 34892a9e4f7SAdrian Hunter return 0; 34992a9e4f7SAdrian Hunter } 35092a9e4f7SAdrian Hunter 35192a9e4f7SAdrian Hunter while (ts->cnt) { 35292a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 35392a9e4f7SAdrian Hunter ts->last_time, 0, true); 35492a9e4f7SAdrian Hunter if (err) { 35592a9e4f7SAdrian Hunter pr_err("Error flushing thread stack!\n"); 35692a9e4f7SAdrian Hunter ts->cnt = 0; 35792a9e4f7SAdrian Hunter return err; 35892a9e4f7SAdrian Hunter } 35992a9e4f7SAdrian Hunter } 36092a9e4f7SAdrian Hunter 36192a9e4f7SAdrian Hunter return 0; 36292a9e4f7SAdrian Hunter } 36392a9e4f7SAdrian Hunter 364a5499b37SAdrian Hunter int thread_stack__flush(struct thread *thread) 365a5499b37SAdrian Hunter { 366bd8e68acSAdrian Hunter struct thread_stack *ts = thread->ts; 367f6060ac6SAdrian Hunter unsigned int pos; 368f6060ac6SAdrian Hunter int err = 0; 369bd8e68acSAdrian Hunter 370f6060ac6SAdrian Hunter if (ts) { 371f6060ac6SAdrian Hunter for (pos = 0; pos < ts->arr_sz; pos++) { 372f6060ac6SAdrian Hunter int ret = __thread_stack__flush(thread, ts + pos); 373a5499b37SAdrian Hunter 374f6060ac6SAdrian Hunter if (ret) 375f6060ac6SAdrian Hunter err = ret; 376f6060ac6SAdrian Hunter } 377f6060ac6SAdrian Hunter } 378f6060ac6SAdrian Hunter 379f6060ac6SAdrian Hunter return err; 380a5499b37SAdrian Hunter } 381a5499b37SAdrian Hunter 38286d67180SAdrian Hunter static void thread_stack__update_br_stack(struct thread_stack *ts, u32 flags, 38386d67180SAdrian Hunter u64 from_ip, u64 to_ip) 38486d67180SAdrian Hunter { 38586d67180SAdrian Hunter struct branch_stack *bs = ts->br_stack_rb; 38686d67180SAdrian Hunter struct branch_entry *be; 38786d67180SAdrian Hunter 38886d67180SAdrian Hunter if (!ts->br_stack_pos) 38986d67180SAdrian Hunter ts->br_stack_pos = ts->br_stack_sz; 39086d67180SAdrian Hunter 39186d67180SAdrian Hunter ts->br_stack_pos -= 1; 39286d67180SAdrian Hunter 39386d67180SAdrian Hunter be = &bs->entries[ts->br_stack_pos]; 39486d67180SAdrian Hunter be->from = from_ip; 39586d67180SAdrian Hunter be->to = to_ip; 39686d67180SAdrian Hunter be->flags.value = 0; 39786d67180SAdrian Hunter be->flags.abort = !!(flags & PERF_IP_FLAG_TX_ABORT); 39886d67180SAdrian Hunter be->flags.in_tx = !!(flags & PERF_IP_FLAG_IN_TX); 39986d67180SAdrian Hunter /* No support for mispredict */ 40086d67180SAdrian Hunter be->flags.mispred = ts->mispred_all; 40186d67180SAdrian Hunter 40286d67180SAdrian Hunter if (bs->nr < ts->br_stack_sz) 40386d67180SAdrian Hunter bs->nr += 1; 40486d67180SAdrian Hunter } 40586d67180SAdrian Hunter 406256d92bcSAdrian Hunter int thread_stack__event(struct thread *thread, int cpu, u32 flags, u64 from_ip, 40786d67180SAdrian Hunter u64 to_ip, u16 insn_len, u64 trace_nr, bool callstack, 40886d67180SAdrian Hunter unsigned int br_stack_sz, bool mispred_all) 40900447ccdSAdrian Hunter { 410256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 411bd8e68acSAdrian Hunter 41200447ccdSAdrian Hunter if (!thread) 41300447ccdSAdrian Hunter return -EINVAL; 41400447ccdSAdrian Hunter 415bd8e68acSAdrian Hunter if (!ts) { 41686d67180SAdrian Hunter ts = thread_stack__new(thread, cpu, NULL, callstack, br_stack_sz); 417bd8e68acSAdrian Hunter if (!ts) { 41800447ccdSAdrian Hunter pr_warning("Out of memory: no thread stack\n"); 41900447ccdSAdrian Hunter return -ENOMEM; 42000447ccdSAdrian Hunter } 421bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 42286d67180SAdrian Hunter ts->mispred_all = mispred_all; 42300447ccdSAdrian Hunter } 42400447ccdSAdrian Hunter 42500447ccdSAdrian Hunter /* 42600447ccdSAdrian Hunter * When the trace is discontinuous, the trace_nr changes. In that case 42700447ccdSAdrian Hunter * the stack might be completely invalid. Better to report nothing than 42892a9e4f7SAdrian Hunter * to report something misleading, so flush the stack. 42900447ccdSAdrian Hunter */ 430bd8e68acSAdrian Hunter if (trace_nr != ts->trace_nr) { 431bd8e68acSAdrian Hunter if (ts->trace_nr) 432bd8e68acSAdrian Hunter __thread_stack__flush(thread, ts); 433bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 43400447ccdSAdrian Hunter } 43500447ccdSAdrian Hunter 43686d67180SAdrian Hunter if (br_stack_sz) 43786d67180SAdrian Hunter thread_stack__update_br_stack(ts, flags, from_ip, to_ip); 43886d67180SAdrian Hunter 43986d67180SAdrian Hunter /* 44086d67180SAdrian Hunter * Stop here if thread_stack__process() is in use, or not recording call 44186d67180SAdrian Hunter * stack. 44286d67180SAdrian Hunter */ 44386d67180SAdrian Hunter if (ts->crp || !callstack) 44492a9e4f7SAdrian Hunter return 0; 44592a9e4f7SAdrian Hunter 44600447ccdSAdrian Hunter if (flags & PERF_IP_FLAG_CALL) { 44700447ccdSAdrian Hunter u64 ret_addr; 44800447ccdSAdrian Hunter 44900447ccdSAdrian Hunter if (!to_ip) 45000447ccdSAdrian Hunter return 0; 45100447ccdSAdrian Hunter ret_addr = from_ip + insn_len; 45200447ccdSAdrian Hunter if (ret_addr == to_ip) 45300447ccdSAdrian Hunter return 0; /* Zero-length calls are excluded */ 454bd8e68acSAdrian Hunter return thread_stack__push(ts, ret_addr, 4554d60e5e3SAdrian Hunter flags & PERF_IP_FLAG_TRACE_END); 4564d60e5e3SAdrian Hunter } else if (flags & PERF_IP_FLAG_TRACE_BEGIN) { 4574d60e5e3SAdrian Hunter /* 4584d60e5e3SAdrian Hunter * If the caller did not change the trace number (which would 4594d60e5e3SAdrian Hunter * have flushed the stack) then try to make sense of the stack. 4604d60e5e3SAdrian Hunter * Possibly, tracing began after returning to the current 4614d60e5e3SAdrian Hunter * address, so try to pop that. Also, do not expect a call made 4624d60e5e3SAdrian Hunter * when the trace ended, to return, so pop that. 4634d60e5e3SAdrian Hunter */ 464bd8e68acSAdrian Hunter thread_stack__pop(ts, to_ip); 465bd8e68acSAdrian Hunter thread_stack__pop_trace_end(ts); 4664d60e5e3SAdrian Hunter } else if ((flags & PERF_IP_FLAG_RETURN) && from_ip) { 467bd8e68acSAdrian Hunter thread_stack__pop(ts, to_ip); 46800447ccdSAdrian Hunter } 46900447ccdSAdrian Hunter 47000447ccdSAdrian Hunter return 0; 47100447ccdSAdrian Hunter } 47200447ccdSAdrian Hunter 473256d92bcSAdrian Hunter void thread_stack__set_trace_nr(struct thread *thread, int cpu, u64 trace_nr) 47492a9e4f7SAdrian Hunter { 475256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 476bd8e68acSAdrian Hunter 477bd8e68acSAdrian Hunter if (!ts) 47892a9e4f7SAdrian Hunter return; 47992a9e4f7SAdrian Hunter 480bd8e68acSAdrian Hunter if (trace_nr != ts->trace_nr) { 481bd8e68acSAdrian Hunter if (ts->trace_nr) 482bd8e68acSAdrian Hunter __thread_stack__flush(thread, ts); 483bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 48492a9e4f7SAdrian Hunter } 48592a9e4f7SAdrian Hunter } 48692a9e4f7SAdrian Hunter 487f6060ac6SAdrian Hunter static void __thread_stack__free(struct thread *thread, struct thread_stack *ts) 488f6060ac6SAdrian Hunter { 489f6060ac6SAdrian Hunter __thread_stack__flush(thread, ts); 490f6060ac6SAdrian Hunter zfree(&ts->stack); 49186d67180SAdrian Hunter zfree(&ts->br_stack_rb); 492f6060ac6SAdrian Hunter } 493f6060ac6SAdrian Hunter 494f6060ac6SAdrian Hunter static void thread_stack__reset(struct thread *thread, struct thread_stack *ts) 495f6060ac6SAdrian Hunter { 496f6060ac6SAdrian Hunter unsigned int arr_sz = ts->arr_sz; 497f6060ac6SAdrian Hunter 498f6060ac6SAdrian Hunter __thread_stack__free(thread, ts); 499f6060ac6SAdrian Hunter memset(ts, 0, sizeof(*ts)); 500f6060ac6SAdrian Hunter ts->arr_sz = arr_sz; 501f6060ac6SAdrian Hunter } 502f6060ac6SAdrian Hunter 50300447ccdSAdrian Hunter void thread_stack__free(struct thread *thread) 50400447ccdSAdrian Hunter { 505bd8e68acSAdrian Hunter struct thread_stack *ts = thread->ts; 506f6060ac6SAdrian Hunter unsigned int pos; 507bd8e68acSAdrian Hunter 508bd8e68acSAdrian Hunter if (ts) { 509f6060ac6SAdrian Hunter for (pos = 0; pos < ts->arr_sz; pos++) 510f6060ac6SAdrian Hunter __thread_stack__free(thread, ts + pos); 51100447ccdSAdrian Hunter zfree(&thread->ts); 51200447ccdSAdrian Hunter } 51300447ccdSAdrian Hunter } 51400447ccdSAdrian Hunter 51524248306SAdrian Hunter static inline u64 callchain_context(u64 ip, u64 kernel_start) 51600447ccdSAdrian Hunter { 51724248306SAdrian Hunter return ip < kernel_start ? PERF_CONTEXT_USER : PERF_CONTEXT_KERNEL; 51824248306SAdrian Hunter } 51900447ccdSAdrian Hunter 520256d92bcSAdrian Hunter void thread_stack__sample(struct thread *thread, int cpu, 521256d92bcSAdrian Hunter struct ip_callchain *chain, 52224248306SAdrian Hunter size_t sz, u64 ip, u64 kernel_start) 52324248306SAdrian Hunter { 524256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 52524248306SAdrian Hunter u64 context = callchain_context(ip, kernel_start); 52624248306SAdrian Hunter u64 last_context; 52724248306SAdrian Hunter size_t i, j; 52800447ccdSAdrian Hunter 52924248306SAdrian Hunter if (sz < 2) { 53024248306SAdrian Hunter chain->nr = 0; 53124248306SAdrian Hunter return; 53224248306SAdrian Hunter } 53300447ccdSAdrian Hunter 53424248306SAdrian Hunter chain->ips[0] = context; 53524248306SAdrian Hunter chain->ips[1] = ip; 53624248306SAdrian Hunter 537bd8e68acSAdrian Hunter if (!ts) { 53824248306SAdrian Hunter chain->nr = 2; 53924248306SAdrian Hunter return; 54024248306SAdrian Hunter } 54124248306SAdrian Hunter 54224248306SAdrian Hunter last_context = context; 54324248306SAdrian Hunter 544bd8e68acSAdrian Hunter for (i = 2, j = 1; i < sz && j <= ts->cnt; i++, j++) { 545bd8e68acSAdrian Hunter ip = ts->stack[ts->cnt - j].ret_addr; 54624248306SAdrian Hunter context = callchain_context(ip, kernel_start); 54724248306SAdrian Hunter if (context != last_context) { 54824248306SAdrian Hunter if (i >= sz - 1) 54924248306SAdrian Hunter break; 55024248306SAdrian Hunter chain->ips[i++] = context; 55124248306SAdrian Hunter last_context = context; 55224248306SAdrian Hunter } 55324248306SAdrian Hunter chain->ips[i] = ip; 55424248306SAdrian Hunter } 55524248306SAdrian Hunter 55624248306SAdrian Hunter chain->nr = i; 55700447ccdSAdrian Hunter } 55892a9e4f7SAdrian Hunter 5594fef41bfSAdrian Hunter /* 5604fef41bfSAdrian Hunter * Hardware sample records, created some time after the event occurred, need to 5614fef41bfSAdrian Hunter * have subsequent addresses removed from the call chain. 5624fef41bfSAdrian Hunter */ 5634fef41bfSAdrian Hunter void thread_stack__sample_late(struct thread *thread, int cpu, 5644fef41bfSAdrian Hunter struct ip_callchain *chain, size_t sz, 5654fef41bfSAdrian Hunter u64 sample_ip, u64 kernel_start) 5664fef41bfSAdrian Hunter { 5674fef41bfSAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 5684fef41bfSAdrian Hunter u64 sample_context = callchain_context(sample_ip, kernel_start); 5694fef41bfSAdrian Hunter u64 last_context, context, ip; 5704fef41bfSAdrian Hunter size_t nr = 0, j; 5714fef41bfSAdrian Hunter 5724fef41bfSAdrian Hunter if (sz < 2) { 5734fef41bfSAdrian Hunter chain->nr = 0; 5744fef41bfSAdrian Hunter return; 5754fef41bfSAdrian Hunter } 5764fef41bfSAdrian Hunter 5774fef41bfSAdrian Hunter if (!ts) 5784fef41bfSAdrian Hunter goto out; 5794fef41bfSAdrian Hunter 5804fef41bfSAdrian Hunter /* 5814fef41bfSAdrian Hunter * When tracing kernel space, kernel addresses occur at the top of the 5824fef41bfSAdrian Hunter * call chain after the event occurred but before tracing stopped. 5834fef41bfSAdrian Hunter * Skip them. 5844fef41bfSAdrian Hunter */ 5854fef41bfSAdrian Hunter for (j = 1; j <= ts->cnt; j++) { 5864fef41bfSAdrian Hunter ip = ts->stack[ts->cnt - j].ret_addr; 5874fef41bfSAdrian Hunter context = callchain_context(ip, kernel_start); 5884fef41bfSAdrian Hunter if (context == PERF_CONTEXT_USER || 5894fef41bfSAdrian Hunter (context == sample_context && ip == sample_ip)) 5904fef41bfSAdrian Hunter break; 5914fef41bfSAdrian Hunter } 5924fef41bfSAdrian Hunter 5934fef41bfSAdrian Hunter last_context = sample_ip; /* Use sample_ip as an invalid context */ 5944fef41bfSAdrian Hunter 5954fef41bfSAdrian Hunter for (; nr < sz && j <= ts->cnt; nr++, j++) { 5964fef41bfSAdrian Hunter ip = ts->stack[ts->cnt - j].ret_addr; 5974fef41bfSAdrian Hunter context = callchain_context(ip, kernel_start); 5984fef41bfSAdrian Hunter if (context != last_context) { 5994fef41bfSAdrian Hunter if (nr >= sz - 1) 6004fef41bfSAdrian Hunter break; 6014fef41bfSAdrian Hunter chain->ips[nr++] = context; 6024fef41bfSAdrian Hunter last_context = context; 6034fef41bfSAdrian Hunter } 6044fef41bfSAdrian Hunter chain->ips[nr] = ip; 6054fef41bfSAdrian Hunter } 6064fef41bfSAdrian Hunter out: 6074fef41bfSAdrian Hunter if (nr) { 6084fef41bfSAdrian Hunter chain->nr = nr; 6094fef41bfSAdrian Hunter } else { 6104fef41bfSAdrian Hunter chain->ips[0] = sample_context; 6114fef41bfSAdrian Hunter chain->ips[1] = sample_ip; 6124fef41bfSAdrian Hunter chain->nr = 2; 6134fef41bfSAdrian Hunter } 6144fef41bfSAdrian Hunter } 6154fef41bfSAdrian Hunter 61686d67180SAdrian Hunter void thread_stack__br_sample(struct thread *thread, int cpu, 61786d67180SAdrian Hunter struct branch_stack *dst, unsigned int sz) 61886d67180SAdrian Hunter { 61986d67180SAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 62086d67180SAdrian Hunter const size_t bsz = sizeof(struct branch_entry); 62186d67180SAdrian Hunter struct branch_stack *src; 62286d67180SAdrian Hunter struct branch_entry *be; 62386d67180SAdrian Hunter unsigned int nr; 62486d67180SAdrian Hunter 62586d67180SAdrian Hunter dst->nr = 0; 62686d67180SAdrian Hunter 62786d67180SAdrian Hunter if (!ts) 62886d67180SAdrian Hunter return; 62986d67180SAdrian Hunter 63086d67180SAdrian Hunter src = ts->br_stack_rb; 63186d67180SAdrian Hunter if (!src->nr) 63286d67180SAdrian Hunter return; 63386d67180SAdrian Hunter 63486d67180SAdrian Hunter dst->nr = min((unsigned int)src->nr, sz); 63586d67180SAdrian Hunter 63686d67180SAdrian Hunter be = &dst->entries[0]; 63786d67180SAdrian Hunter nr = min(ts->br_stack_sz - ts->br_stack_pos, (unsigned int)dst->nr); 63886d67180SAdrian Hunter memcpy(be, &src->entries[ts->br_stack_pos], bsz * nr); 63986d67180SAdrian Hunter 64086d67180SAdrian Hunter if (src->nr >= ts->br_stack_sz) { 64186d67180SAdrian Hunter sz -= nr; 64286d67180SAdrian Hunter be = &dst->entries[nr]; 64386d67180SAdrian Hunter nr = min(ts->br_stack_pos, sz); 64486d67180SAdrian Hunter memcpy(be, &src->entries[0], bsz * ts->br_stack_pos); 64586d67180SAdrian Hunter } 64686d67180SAdrian Hunter } 64786d67180SAdrian Hunter 64892a9e4f7SAdrian Hunter struct call_return_processor * 649f435887eSAdrian Hunter call_return_processor__new(int (*process)(struct call_return *cr, u64 *parent_db_id, void *data), 65092a9e4f7SAdrian Hunter void *data) 65192a9e4f7SAdrian Hunter { 65292a9e4f7SAdrian Hunter struct call_return_processor *crp; 65392a9e4f7SAdrian Hunter 65492a9e4f7SAdrian Hunter crp = zalloc(sizeof(struct call_return_processor)); 65592a9e4f7SAdrian Hunter if (!crp) 65692a9e4f7SAdrian Hunter return NULL; 65792a9e4f7SAdrian Hunter crp->cpr = call_path_root__new(); 65892a9e4f7SAdrian Hunter if (!crp->cpr) 65992a9e4f7SAdrian Hunter goto out_free; 66092a9e4f7SAdrian Hunter crp->process = process; 66192a9e4f7SAdrian Hunter crp->data = data; 66292a9e4f7SAdrian Hunter return crp; 66392a9e4f7SAdrian Hunter 66492a9e4f7SAdrian Hunter out_free: 66592a9e4f7SAdrian Hunter free(crp); 66692a9e4f7SAdrian Hunter return NULL; 66792a9e4f7SAdrian Hunter } 66892a9e4f7SAdrian Hunter 66992a9e4f7SAdrian Hunter void call_return_processor__free(struct call_return_processor *crp) 67092a9e4f7SAdrian Hunter { 67192a9e4f7SAdrian Hunter if (crp) { 67292a9e4f7SAdrian Hunter call_path_root__free(crp->cpr); 67392a9e4f7SAdrian Hunter free(crp); 67492a9e4f7SAdrian Hunter } 67592a9e4f7SAdrian Hunter } 67692a9e4f7SAdrian Hunter 67792a9e4f7SAdrian Hunter static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr, 67892a9e4f7SAdrian Hunter u64 timestamp, u64 ref, struct call_path *cp, 6792dcde4e1SAdrian Hunter bool no_call, bool trace_end) 68092a9e4f7SAdrian Hunter { 68192a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 68292a9e4f7SAdrian Hunter int err; 68392a9e4f7SAdrian Hunter 684e7a3a055SAdrian Hunter if (!cp) 685e7a3a055SAdrian Hunter return -ENOMEM; 686e7a3a055SAdrian Hunter 68792a9e4f7SAdrian Hunter if (ts->cnt == ts->sz) { 68892a9e4f7SAdrian Hunter err = thread_stack__grow(ts); 68992a9e4f7SAdrian Hunter if (err) 69092a9e4f7SAdrian Hunter return err; 69192a9e4f7SAdrian Hunter } 69292a9e4f7SAdrian Hunter 69392a9e4f7SAdrian Hunter tse = &ts->stack[ts->cnt++]; 69492a9e4f7SAdrian Hunter tse->ret_addr = ret_addr; 69592a9e4f7SAdrian Hunter tse->timestamp = timestamp; 69692a9e4f7SAdrian Hunter tse->ref = ref; 69792a9e4f7SAdrian Hunter tse->branch_count = ts->branch_count; 698003ccdc7SAdrian Hunter tse->insn_count = ts->insn_count; 699003ccdc7SAdrian Hunter tse->cyc_count = ts->cyc_count; 70092a9e4f7SAdrian Hunter tse->cp = cp; 70192a9e4f7SAdrian Hunter tse->no_call = no_call; 7022dcde4e1SAdrian Hunter tse->trace_end = trace_end; 703f08046cbSAdrian Hunter tse->non_call = false; 704f435887eSAdrian Hunter tse->db_id = 0; 70592a9e4f7SAdrian Hunter 70692a9e4f7SAdrian Hunter return 0; 70792a9e4f7SAdrian Hunter } 70892a9e4f7SAdrian Hunter 70992a9e4f7SAdrian Hunter static int thread_stack__pop_cp(struct thread *thread, struct thread_stack *ts, 71092a9e4f7SAdrian Hunter u64 ret_addr, u64 timestamp, u64 ref, 71192a9e4f7SAdrian Hunter struct symbol *sym) 71292a9e4f7SAdrian Hunter { 71392a9e4f7SAdrian Hunter int err; 71492a9e4f7SAdrian Hunter 71592a9e4f7SAdrian Hunter if (!ts->cnt) 71692a9e4f7SAdrian Hunter return 1; 71792a9e4f7SAdrian Hunter 71892a9e4f7SAdrian Hunter if (ts->cnt == 1) { 71992a9e4f7SAdrian Hunter struct thread_stack_entry *tse = &ts->stack[0]; 72092a9e4f7SAdrian Hunter 72192a9e4f7SAdrian Hunter if (tse->cp->sym == sym) 72292a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 72392a9e4f7SAdrian Hunter timestamp, ref, false); 72492a9e4f7SAdrian Hunter } 72592a9e4f7SAdrian Hunter 726f08046cbSAdrian Hunter if (ts->stack[ts->cnt - 1].ret_addr == ret_addr && 727f08046cbSAdrian Hunter !ts->stack[ts->cnt - 1].non_call) { 72892a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 72992a9e4f7SAdrian Hunter timestamp, ref, false); 73092a9e4f7SAdrian Hunter } else { 73192a9e4f7SAdrian Hunter size_t i = ts->cnt - 1; 73292a9e4f7SAdrian Hunter 73392a9e4f7SAdrian Hunter while (i--) { 734f08046cbSAdrian Hunter if (ts->stack[i].ret_addr != ret_addr || 735f08046cbSAdrian Hunter ts->stack[i].non_call) 73692a9e4f7SAdrian Hunter continue; 73792a9e4f7SAdrian Hunter i += 1; 73892a9e4f7SAdrian Hunter while (ts->cnt > i) { 73992a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, 74092a9e4f7SAdrian Hunter --ts->cnt, 74192a9e4f7SAdrian Hunter timestamp, ref, 74292a9e4f7SAdrian Hunter true); 74392a9e4f7SAdrian Hunter if (err) 74492a9e4f7SAdrian Hunter return err; 74592a9e4f7SAdrian Hunter } 74692a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 74792a9e4f7SAdrian Hunter timestamp, ref, false); 74892a9e4f7SAdrian Hunter } 74992a9e4f7SAdrian Hunter } 75092a9e4f7SAdrian Hunter 75192a9e4f7SAdrian Hunter return 1; 75292a9e4f7SAdrian Hunter } 75392a9e4f7SAdrian Hunter 754e0b89511SAdrian Hunter static int thread_stack__bottom(struct thread_stack *ts, 75592a9e4f7SAdrian Hunter struct perf_sample *sample, 75692a9e4f7SAdrian Hunter struct addr_location *from_al, 75792a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref) 75892a9e4f7SAdrian Hunter { 75992a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 76092a9e4f7SAdrian Hunter struct call_path *cp; 76192a9e4f7SAdrian Hunter struct symbol *sym; 76292a9e4f7SAdrian Hunter u64 ip; 76392a9e4f7SAdrian Hunter 76492a9e4f7SAdrian Hunter if (sample->ip) { 76592a9e4f7SAdrian Hunter ip = sample->ip; 76692a9e4f7SAdrian Hunter sym = from_al->sym; 76792a9e4f7SAdrian Hunter } else if (sample->addr) { 76892a9e4f7SAdrian Hunter ip = sample->addr; 76992a9e4f7SAdrian Hunter sym = to_al->sym; 77092a9e4f7SAdrian Hunter } else { 77192a9e4f7SAdrian Hunter return 0; 77292a9e4f7SAdrian Hunter } 77392a9e4f7SAdrian Hunter 77492a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, &cpr->call_path, sym, ip, 77592a9e4f7SAdrian Hunter ts->kernel_start); 77692a9e4f7SAdrian Hunter 777e0b89511SAdrian Hunter return thread_stack__push_cp(ts, ip, sample->time, ref, cp, 7782dcde4e1SAdrian Hunter true, false); 77992a9e4f7SAdrian Hunter } 78092a9e4f7SAdrian Hunter 78197860b48SAdrian Hunter static int thread_stack__pop_ks(struct thread *thread, struct thread_stack *ts, 78297860b48SAdrian Hunter struct perf_sample *sample, u64 ref) 78397860b48SAdrian Hunter { 78497860b48SAdrian Hunter u64 tm = sample->time; 78597860b48SAdrian Hunter int err; 78697860b48SAdrian Hunter 78797860b48SAdrian Hunter /* Return to userspace, so pop all kernel addresses */ 78897860b48SAdrian Hunter while (thread_stack__in_kernel(ts)) { 78997860b48SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 79097860b48SAdrian Hunter tm, ref, true); 79197860b48SAdrian Hunter if (err) 79297860b48SAdrian Hunter return err; 79397860b48SAdrian Hunter } 79497860b48SAdrian Hunter 79597860b48SAdrian Hunter return 0; 79697860b48SAdrian Hunter } 79797860b48SAdrian Hunter 79892a9e4f7SAdrian Hunter static int thread_stack__no_call_return(struct thread *thread, 79992a9e4f7SAdrian Hunter struct thread_stack *ts, 80092a9e4f7SAdrian Hunter struct perf_sample *sample, 80192a9e4f7SAdrian Hunter struct addr_location *from_al, 80292a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref) 80392a9e4f7SAdrian Hunter { 80492a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 80590c2cda7SAdrian Hunter struct call_path *root = &cpr->call_path; 80690c2cda7SAdrian Hunter struct symbol *fsym = from_al->sym; 80790c2cda7SAdrian Hunter struct symbol *tsym = to_al->sym; 80892a9e4f7SAdrian Hunter struct call_path *cp, *parent; 80992a9e4f7SAdrian Hunter u64 ks = ts->kernel_start; 81090c2cda7SAdrian Hunter u64 addr = sample->addr; 81190c2cda7SAdrian Hunter u64 tm = sample->time; 81290c2cda7SAdrian Hunter u64 ip = sample->ip; 81392a9e4f7SAdrian Hunter int err; 81492a9e4f7SAdrian Hunter 81590c2cda7SAdrian Hunter if (ip >= ks && addr < ks) { 81692a9e4f7SAdrian Hunter /* Return to userspace, so pop all kernel addresses */ 817eb5d8544SAdrian Hunter err = thread_stack__pop_ks(thread, ts, sample, ref); 81892a9e4f7SAdrian Hunter if (err) 81992a9e4f7SAdrian Hunter return err; 82092a9e4f7SAdrian Hunter 82192a9e4f7SAdrian Hunter /* If the stack is empty, push the userspace address */ 82292a9e4f7SAdrian Hunter if (!ts->cnt) { 82390c2cda7SAdrian Hunter cp = call_path__findnew(cpr, root, tsym, addr, ks); 82490c2cda7SAdrian Hunter return thread_stack__push_cp(ts, 0, tm, ref, cp, true, 82590c2cda7SAdrian Hunter false); 82692a9e4f7SAdrian Hunter } 82790c2cda7SAdrian Hunter } else if (thread_stack__in_kernel(ts) && ip < ks) { 82892a9e4f7SAdrian Hunter /* Return to userspace, so pop all kernel addresses */ 829eb5d8544SAdrian Hunter err = thread_stack__pop_ks(thread, ts, sample, ref); 83092a9e4f7SAdrian Hunter if (err) 83192a9e4f7SAdrian Hunter return err; 83292a9e4f7SAdrian Hunter } 83392a9e4f7SAdrian Hunter 83492a9e4f7SAdrian Hunter if (ts->cnt) 83592a9e4f7SAdrian Hunter parent = ts->stack[ts->cnt - 1].cp; 83692a9e4f7SAdrian Hunter else 83790c2cda7SAdrian Hunter parent = root; 83892a9e4f7SAdrian Hunter 8391f35cd65SAdrian Hunter if (parent->sym == from_al->sym) { 8401f35cd65SAdrian Hunter /* 8411f35cd65SAdrian Hunter * At the bottom of the stack, assume the missing 'call' was 8421f35cd65SAdrian Hunter * before the trace started. So, pop the current symbol and push 8431f35cd65SAdrian Hunter * the 'to' symbol. 8441f35cd65SAdrian Hunter */ 8451f35cd65SAdrian Hunter if (ts->cnt == 1) { 8461f35cd65SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 8471f35cd65SAdrian Hunter tm, ref, false); 8481f35cd65SAdrian Hunter if (err) 8491f35cd65SAdrian Hunter return err; 8501f35cd65SAdrian Hunter } 8511f35cd65SAdrian Hunter 8521f35cd65SAdrian Hunter if (!ts->cnt) { 8531f35cd65SAdrian Hunter cp = call_path__findnew(cpr, root, tsym, addr, ks); 8541f35cd65SAdrian Hunter 8551f35cd65SAdrian Hunter return thread_stack__push_cp(ts, addr, tm, ref, cp, 8561f35cd65SAdrian Hunter true, false); 8571f35cd65SAdrian Hunter } 8581f35cd65SAdrian Hunter 8591f35cd65SAdrian Hunter /* 8601f35cd65SAdrian Hunter * Otherwise assume the 'return' is being used as a jump (e.g. 8611f35cd65SAdrian Hunter * retpoline) and just push the 'to' symbol. 8621f35cd65SAdrian Hunter */ 8631f35cd65SAdrian Hunter cp = call_path__findnew(cpr, parent, tsym, addr, ks); 8641f35cd65SAdrian Hunter 8651f35cd65SAdrian Hunter err = thread_stack__push_cp(ts, 0, tm, ref, cp, true, false); 8661f35cd65SAdrian Hunter if (!err) 8671f35cd65SAdrian Hunter ts->stack[ts->cnt - 1].non_call = true; 8681f35cd65SAdrian Hunter 8691f35cd65SAdrian Hunter return err; 8701f35cd65SAdrian Hunter } 8711f35cd65SAdrian Hunter 8721f35cd65SAdrian Hunter /* 8731f35cd65SAdrian Hunter * Assume 'parent' has not yet returned, so push 'to', and then push and 8741f35cd65SAdrian Hunter * pop 'from'. 8751f35cd65SAdrian Hunter */ 8761f35cd65SAdrian Hunter 8771f35cd65SAdrian Hunter cp = call_path__findnew(cpr, parent, tsym, addr, ks); 87892a9e4f7SAdrian Hunter 87990c2cda7SAdrian Hunter err = thread_stack__push_cp(ts, addr, tm, ref, cp, true, false); 88092a9e4f7SAdrian Hunter if (err) 88192a9e4f7SAdrian Hunter return err; 88292a9e4f7SAdrian Hunter 8831f35cd65SAdrian Hunter cp = call_path__findnew(cpr, cp, fsym, ip, ks); 8841f35cd65SAdrian Hunter 8851f35cd65SAdrian Hunter err = thread_stack__push_cp(ts, ip, tm, ref, cp, true, false); 8861f35cd65SAdrian Hunter if (err) 8871f35cd65SAdrian Hunter return err; 8881f35cd65SAdrian Hunter 8891f35cd65SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, tm, ref, false); 89092a9e4f7SAdrian Hunter } 89192a9e4f7SAdrian Hunter 89292a9e4f7SAdrian Hunter static int thread_stack__trace_begin(struct thread *thread, 89392a9e4f7SAdrian Hunter struct thread_stack *ts, u64 timestamp, 89492a9e4f7SAdrian Hunter u64 ref) 89592a9e4f7SAdrian Hunter { 89692a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 89792a9e4f7SAdrian Hunter int err; 89892a9e4f7SAdrian Hunter 89992a9e4f7SAdrian Hunter if (!ts->cnt) 90092a9e4f7SAdrian Hunter return 0; 90192a9e4f7SAdrian Hunter 90292a9e4f7SAdrian Hunter /* Pop trace end */ 90392a9e4f7SAdrian Hunter tse = &ts->stack[ts->cnt - 1]; 9042dcde4e1SAdrian Hunter if (tse->trace_end) { 90592a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 90692a9e4f7SAdrian Hunter timestamp, ref, false); 90792a9e4f7SAdrian Hunter if (err) 90892a9e4f7SAdrian Hunter return err; 90992a9e4f7SAdrian Hunter } 91092a9e4f7SAdrian Hunter 91192a9e4f7SAdrian Hunter return 0; 91292a9e4f7SAdrian Hunter } 91392a9e4f7SAdrian Hunter 91492a9e4f7SAdrian Hunter static int thread_stack__trace_end(struct thread_stack *ts, 91592a9e4f7SAdrian Hunter struct perf_sample *sample, u64 ref) 91692a9e4f7SAdrian Hunter { 91792a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 91892a9e4f7SAdrian Hunter struct call_path *cp; 91992a9e4f7SAdrian Hunter u64 ret_addr; 92092a9e4f7SAdrian Hunter 92192a9e4f7SAdrian Hunter /* No point having 'trace end' on the bottom of the stack */ 92292a9e4f7SAdrian Hunter if (!ts->cnt || (ts->cnt == 1 && ts->stack[0].ref == ref)) 92392a9e4f7SAdrian Hunter return 0; 92492a9e4f7SAdrian Hunter 92592a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, NULL, 0, 92692a9e4f7SAdrian Hunter ts->kernel_start); 92792a9e4f7SAdrian Hunter 92892a9e4f7SAdrian Hunter ret_addr = sample->ip + sample->insn_len; 92992a9e4f7SAdrian Hunter 93092a9e4f7SAdrian Hunter return thread_stack__push_cp(ts, ret_addr, sample->time, ref, cp, 9312dcde4e1SAdrian Hunter false, true); 93292a9e4f7SAdrian Hunter } 93392a9e4f7SAdrian Hunter 9343c0cd952SAdrian Hunter static bool is_x86_retpoline(const char *name) 9353c0cd952SAdrian Hunter { 9363c0cd952SAdrian Hunter const char *p = strstr(name, "__x86_indirect_thunk_"); 9373c0cd952SAdrian Hunter 9383c0cd952SAdrian Hunter return p == name || !strcmp(name, "__indirect_thunk_start"); 9393c0cd952SAdrian Hunter } 9403c0cd952SAdrian Hunter 9413c0cd952SAdrian Hunter /* 9423c0cd952SAdrian Hunter * x86 retpoline functions pollute the call graph. This function removes them. 9433c0cd952SAdrian Hunter * This does not handle function return thunks, nor is there any improvement 9443c0cd952SAdrian Hunter * for the handling of inline thunks or extern thunks. 9453c0cd952SAdrian Hunter */ 9463c0cd952SAdrian Hunter static int thread_stack__x86_retpoline(struct thread_stack *ts, 9473c0cd952SAdrian Hunter struct perf_sample *sample, 9483c0cd952SAdrian Hunter struct addr_location *to_al) 9493c0cd952SAdrian Hunter { 9503c0cd952SAdrian Hunter struct thread_stack_entry *tse = &ts->stack[ts->cnt - 1]; 9513c0cd952SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 9523c0cd952SAdrian Hunter struct symbol *sym = tse->cp->sym; 9533c0cd952SAdrian Hunter struct symbol *tsym = to_al->sym; 9543c0cd952SAdrian Hunter struct call_path *cp; 9553c0cd952SAdrian Hunter 9563c0cd952SAdrian Hunter if (sym && is_x86_retpoline(sym->name)) { 9573c0cd952SAdrian Hunter /* 9583c0cd952SAdrian Hunter * This is a x86 retpoline fn. It pollutes the call graph by 9593c0cd952SAdrian Hunter * showing up everywhere there is an indirect branch, but does 9603c0cd952SAdrian Hunter * not itself mean anything. Here the top-of-stack is removed, 9613c0cd952SAdrian Hunter * by decrementing the stack count, and then further down, the 9623c0cd952SAdrian Hunter * resulting top-of-stack is replaced with the actual target. 9633c0cd952SAdrian Hunter * The result is that the retpoline functions will no longer 9643c0cd952SAdrian Hunter * appear in the call graph. Note this only affects the call 9653c0cd952SAdrian Hunter * graph, since all the original branches are left unchanged. 9663c0cd952SAdrian Hunter */ 9673c0cd952SAdrian Hunter ts->cnt -= 1; 9683c0cd952SAdrian Hunter sym = ts->stack[ts->cnt - 2].cp->sym; 9693c0cd952SAdrian Hunter if (sym && sym == tsym && to_al->addr != tsym->start) { 9703c0cd952SAdrian Hunter /* 9713c0cd952SAdrian Hunter * Target is back to the middle of the symbol we came 9723c0cd952SAdrian Hunter * from so assume it is an indirect jmp and forget it 9733c0cd952SAdrian Hunter * altogether. 9743c0cd952SAdrian Hunter */ 9753c0cd952SAdrian Hunter ts->cnt -= 1; 9763c0cd952SAdrian Hunter return 0; 9773c0cd952SAdrian Hunter } 9783c0cd952SAdrian Hunter } else if (sym && sym == tsym) { 9793c0cd952SAdrian Hunter /* 9803c0cd952SAdrian Hunter * Target is back to the symbol we came from so assume it is an 9813c0cd952SAdrian Hunter * indirect jmp and forget it altogether. 9823c0cd952SAdrian Hunter */ 9833c0cd952SAdrian Hunter ts->cnt -= 1; 9843c0cd952SAdrian Hunter return 0; 9853c0cd952SAdrian Hunter } 9863c0cd952SAdrian Hunter 9873c0cd952SAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 2].cp, tsym, 9883c0cd952SAdrian Hunter sample->addr, ts->kernel_start); 9893c0cd952SAdrian Hunter if (!cp) 9903c0cd952SAdrian Hunter return -ENOMEM; 9913c0cd952SAdrian Hunter 9923c0cd952SAdrian Hunter /* Replace the top-of-stack with the actual target */ 9933c0cd952SAdrian Hunter ts->stack[ts->cnt - 1].cp = cp; 9943c0cd952SAdrian Hunter 9953c0cd952SAdrian Hunter return 0; 9963c0cd952SAdrian Hunter } 9973c0cd952SAdrian Hunter 99892a9e4f7SAdrian Hunter int thread_stack__process(struct thread *thread, struct comm *comm, 99992a9e4f7SAdrian Hunter struct perf_sample *sample, 100092a9e4f7SAdrian Hunter struct addr_location *from_al, 100192a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref, 100292a9e4f7SAdrian Hunter struct call_return_processor *crp) 100392a9e4f7SAdrian Hunter { 1004256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, sample->cpu); 10053c0cd952SAdrian Hunter enum retpoline_state_t rstate; 100692a9e4f7SAdrian Hunter int err = 0; 100792a9e4f7SAdrian Hunter 100803b32cb2SAdrian Hunter if (ts && !ts->crp) { 100992a9e4f7SAdrian Hunter /* Supersede thread_stack__event() */ 1010f6060ac6SAdrian Hunter thread_stack__reset(thread, ts); 101103b32cb2SAdrian Hunter ts = NULL; 101292a9e4f7SAdrian Hunter } 101303b32cb2SAdrian Hunter 101403b32cb2SAdrian Hunter if (!ts) { 101586d67180SAdrian Hunter ts = thread_stack__new(thread, sample->cpu, crp, true, 0); 1016bd8e68acSAdrian Hunter if (!ts) 101792a9e4f7SAdrian Hunter return -ENOMEM; 101892a9e4f7SAdrian Hunter ts->comm = comm; 101992a9e4f7SAdrian Hunter } 102092a9e4f7SAdrian Hunter 10213c0cd952SAdrian Hunter rstate = ts->rstate; 10223c0cd952SAdrian Hunter if (rstate == X86_RETPOLINE_DETECTED) 10233c0cd952SAdrian Hunter ts->rstate = X86_RETPOLINE_POSSIBLE; 10243c0cd952SAdrian Hunter 102592a9e4f7SAdrian Hunter /* Flush stack on exec */ 102692a9e4f7SAdrian Hunter if (ts->comm != comm && thread->pid_ == thread->tid) { 1027a5499b37SAdrian Hunter err = __thread_stack__flush(thread, ts); 102892a9e4f7SAdrian Hunter if (err) 102992a9e4f7SAdrian Hunter return err; 103092a9e4f7SAdrian Hunter ts->comm = comm; 103192a9e4f7SAdrian Hunter } 103292a9e4f7SAdrian Hunter 103392a9e4f7SAdrian Hunter /* If the stack is empty, put the current symbol on the stack */ 103492a9e4f7SAdrian Hunter if (!ts->cnt) { 1035e0b89511SAdrian Hunter err = thread_stack__bottom(ts, sample, from_al, to_al, ref); 103692a9e4f7SAdrian Hunter if (err) 103792a9e4f7SAdrian Hunter return err; 103892a9e4f7SAdrian Hunter } 103992a9e4f7SAdrian Hunter 104092a9e4f7SAdrian Hunter ts->branch_count += 1; 1041003ccdc7SAdrian Hunter ts->insn_count += sample->insn_cnt; 1042003ccdc7SAdrian Hunter ts->cyc_count += sample->cyc_cnt; 104392a9e4f7SAdrian Hunter ts->last_time = sample->time; 104492a9e4f7SAdrian Hunter 104592a9e4f7SAdrian Hunter if (sample->flags & PERF_IP_FLAG_CALL) { 10462dcde4e1SAdrian Hunter bool trace_end = sample->flags & PERF_IP_FLAG_TRACE_END; 104792a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 104892a9e4f7SAdrian Hunter struct call_path *cp; 104992a9e4f7SAdrian Hunter u64 ret_addr; 105092a9e4f7SAdrian Hunter 105192a9e4f7SAdrian Hunter if (!sample->ip || !sample->addr) 105292a9e4f7SAdrian Hunter return 0; 105392a9e4f7SAdrian Hunter 105492a9e4f7SAdrian Hunter ret_addr = sample->ip + sample->insn_len; 105592a9e4f7SAdrian Hunter if (ret_addr == sample->addr) 105692a9e4f7SAdrian Hunter return 0; /* Zero-length calls are excluded */ 105792a9e4f7SAdrian Hunter 105892a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, 105992a9e4f7SAdrian Hunter to_al->sym, sample->addr, 106092a9e4f7SAdrian Hunter ts->kernel_start); 106192a9e4f7SAdrian Hunter err = thread_stack__push_cp(ts, ret_addr, sample->time, ref, 10622dcde4e1SAdrian Hunter cp, false, trace_end); 10633c0cd952SAdrian Hunter 10643c0cd952SAdrian Hunter /* 10653c0cd952SAdrian Hunter * A call to the same symbol but not the start of the symbol, 10663c0cd952SAdrian Hunter * may be the start of a x86 retpoline. 10673c0cd952SAdrian Hunter */ 10683c0cd952SAdrian Hunter if (!err && rstate == X86_RETPOLINE_POSSIBLE && to_al->sym && 10693c0cd952SAdrian Hunter from_al->sym == to_al->sym && 10703c0cd952SAdrian Hunter to_al->addr != to_al->sym->start) 10713c0cd952SAdrian Hunter ts->rstate = X86_RETPOLINE_DETECTED; 10723c0cd952SAdrian Hunter 107392a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_RETURN) { 107497860b48SAdrian Hunter if (!sample->addr) { 107597860b48SAdrian Hunter u32 return_from_kernel = PERF_IP_FLAG_SYSCALLRET | 107697860b48SAdrian Hunter PERF_IP_FLAG_INTERRUPT; 107797860b48SAdrian Hunter 107897860b48SAdrian Hunter if (!(sample->flags & return_from_kernel)) 107997860b48SAdrian Hunter return 0; 108097860b48SAdrian Hunter 108197860b48SAdrian Hunter /* Pop kernel stack */ 108297860b48SAdrian Hunter return thread_stack__pop_ks(thread, ts, sample, ref); 108397860b48SAdrian Hunter } 108497860b48SAdrian Hunter 108597860b48SAdrian Hunter if (!sample->ip) 108692a9e4f7SAdrian Hunter return 0; 108792a9e4f7SAdrian Hunter 10883c0cd952SAdrian Hunter /* x86 retpoline 'return' doesn't match the stack */ 10893c0cd952SAdrian Hunter if (rstate == X86_RETPOLINE_DETECTED && ts->cnt > 2 && 10903c0cd952SAdrian Hunter ts->stack[ts->cnt - 1].ret_addr != sample->addr) 10913c0cd952SAdrian Hunter return thread_stack__x86_retpoline(ts, sample, to_al); 10923c0cd952SAdrian Hunter 109392a9e4f7SAdrian Hunter err = thread_stack__pop_cp(thread, ts, sample->addr, 109492a9e4f7SAdrian Hunter sample->time, ref, from_al->sym); 109592a9e4f7SAdrian Hunter if (err) { 109692a9e4f7SAdrian Hunter if (err < 0) 109792a9e4f7SAdrian Hunter return err; 109892a9e4f7SAdrian Hunter err = thread_stack__no_call_return(thread, ts, sample, 109992a9e4f7SAdrian Hunter from_al, to_al, ref); 110092a9e4f7SAdrian Hunter } 110192a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_TRACE_BEGIN) { 110292a9e4f7SAdrian Hunter err = thread_stack__trace_begin(thread, ts, sample->time, ref); 110392a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_TRACE_END) { 110492a9e4f7SAdrian Hunter err = thread_stack__trace_end(ts, sample, ref); 1105f08046cbSAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_BRANCH && 1106f08046cbSAdrian Hunter from_al->sym != to_al->sym && to_al->sym && 1107f08046cbSAdrian Hunter to_al->addr == to_al->sym->start) { 1108f08046cbSAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 1109f08046cbSAdrian Hunter struct call_path *cp; 1110f08046cbSAdrian Hunter 1111f08046cbSAdrian Hunter /* 1112f08046cbSAdrian Hunter * The compiler might optimize a call/ret combination by making 1113f08046cbSAdrian Hunter * it a jmp. Make that visible by recording on the stack a 1114f08046cbSAdrian Hunter * branch to the start of a different symbol. Note, that means 1115f08046cbSAdrian Hunter * when a ret pops the stack, all jmps must be popped off first. 1116f08046cbSAdrian Hunter */ 1117f08046cbSAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, 1118f08046cbSAdrian Hunter to_al->sym, sample->addr, 1119f08046cbSAdrian Hunter ts->kernel_start); 1120f08046cbSAdrian Hunter err = thread_stack__push_cp(ts, 0, sample->time, ref, cp, false, 1121f08046cbSAdrian Hunter false); 1122f08046cbSAdrian Hunter if (!err) 1123f08046cbSAdrian Hunter ts->stack[ts->cnt - 1].non_call = true; 112492a9e4f7SAdrian Hunter } 112592a9e4f7SAdrian Hunter 112692a9e4f7SAdrian Hunter return err; 112792a9e4f7SAdrian Hunter } 1128e216708dSAdrian Hunter 1129256d92bcSAdrian Hunter size_t thread_stack__depth(struct thread *thread, int cpu) 1130e216708dSAdrian Hunter { 1131256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 1132bd8e68acSAdrian Hunter 1133bd8e68acSAdrian Hunter if (!ts) 1134e216708dSAdrian Hunter return 0; 1135bd8e68acSAdrian Hunter return ts->cnt; 1136e216708dSAdrian Hunter } 1137