100447ccdSAdrian Hunter /* 200447ccdSAdrian Hunter * thread-stack.c: Synthesize a thread's stack using call / return events 300447ccdSAdrian Hunter * Copyright (c) 2014, Intel Corporation. 400447ccdSAdrian Hunter * 500447ccdSAdrian Hunter * This program is free software; you can redistribute it and/or modify it 600447ccdSAdrian Hunter * under the terms and conditions of the GNU General Public License, 700447ccdSAdrian Hunter * version 2, as published by the Free Software Foundation. 800447ccdSAdrian Hunter * 900447ccdSAdrian Hunter * This program is distributed in the hope it will be useful, but WITHOUT 1000447ccdSAdrian Hunter * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1100447ccdSAdrian Hunter * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 1200447ccdSAdrian Hunter * more details. 1300447ccdSAdrian Hunter * 1400447ccdSAdrian Hunter */ 1500447ccdSAdrian Hunter 1692a9e4f7SAdrian Hunter #include <linux/rbtree.h> 1792a9e4f7SAdrian Hunter #include <linux/list.h> 18a43783aeSArnaldo Carvalho de Melo #include <errno.h> 1900447ccdSAdrian Hunter #include "thread.h" 2000447ccdSAdrian Hunter #include "event.h" 2192a9e4f7SAdrian Hunter #include "machine.h" 2200447ccdSAdrian Hunter #include "util.h" 2300447ccdSAdrian Hunter #include "debug.h" 2492a9e4f7SAdrian Hunter #include "symbol.h" 2592a9e4f7SAdrian Hunter #include "comm.h" 26451db126SChris Phlipot #include "call-path.h" 2700447ccdSAdrian Hunter #include "thread-stack.h" 2800447ccdSAdrian Hunter 2992a9e4f7SAdrian Hunter #define STACK_GROWTH 2048 3092a9e4f7SAdrian Hunter 3192a9e4f7SAdrian Hunter /** 3292a9e4f7SAdrian Hunter * struct thread_stack_entry - thread stack entry. 3392a9e4f7SAdrian Hunter * @ret_addr: return address 3492a9e4f7SAdrian Hunter * @timestamp: timestamp (if known) 3592a9e4f7SAdrian Hunter * @ref: external reference (e.g. db_id of sample) 3692a9e4f7SAdrian Hunter * @branch_count: the branch count when the entry was created 3792a9e4f7SAdrian Hunter * @cp: call path 3892a9e4f7SAdrian Hunter * @no_call: a 'call' was not seen 394d60e5e3SAdrian Hunter * @trace_end: a 'call' but trace ended 4092a9e4f7SAdrian Hunter */ 4192a9e4f7SAdrian Hunter struct thread_stack_entry { 4292a9e4f7SAdrian Hunter u64 ret_addr; 4392a9e4f7SAdrian Hunter u64 timestamp; 4492a9e4f7SAdrian Hunter u64 ref; 4592a9e4f7SAdrian Hunter u64 branch_count; 4692a9e4f7SAdrian Hunter struct call_path *cp; 4792a9e4f7SAdrian Hunter bool no_call; 484d60e5e3SAdrian Hunter bool trace_end; 4992a9e4f7SAdrian Hunter }; 5092a9e4f7SAdrian Hunter 5192a9e4f7SAdrian Hunter /** 5292a9e4f7SAdrian Hunter * struct thread_stack - thread stack constructed from 'call' and 'return' 5392a9e4f7SAdrian Hunter * branch samples. 5492a9e4f7SAdrian Hunter * @stack: array that holds the stack 5592a9e4f7SAdrian Hunter * @cnt: number of entries in the stack 5692a9e4f7SAdrian Hunter * @sz: current maximum stack size 5792a9e4f7SAdrian Hunter * @trace_nr: current trace number 5892a9e4f7SAdrian Hunter * @branch_count: running branch count 5992a9e4f7SAdrian Hunter * @kernel_start: kernel start address 6092a9e4f7SAdrian Hunter * @last_time: last timestamp 6192a9e4f7SAdrian Hunter * @crp: call/return processor 6292a9e4f7SAdrian Hunter * @comm: current comm 63f6060ac6SAdrian Hunter * @arr_sz: size of array if this is the first element of an array 6492a9e4f7SAdrian Hunter */ 6500447ccdSAdrian Hunter struct thread_stack { 6600447ccdSAdrian Hunter struct thread_stack_entry *stack; 6700447ccdSAdrian Hunter size_t cnt; 6800447ccdSAdrian Hunter size_t sz; 6900447ccdSAdrian Hunter u64 trace_nr; 7092a9e4f7SAdrian Hunter u64 branch_count; 7192a9e4f7SAdrian Hunter u64 kernel_start; 7292a9e4f7SAdrian Hunter u64 last_time; 7392a9e4f7SAdrian Hunter struct call_return_processor *crp; 7492a9e4f7SAdrian Hunter struct comm *comm; 75f6060ac6SAdrian Hunter unsigned int arr_sz; 7600447ccdSAdrian Hunter }; 7700447ccdSAdrian Hunter 7800447ccdSAdrian Hunter static int thread_stack__grow(struct thread_stack *ts) 7900447ccdSAdrian Hunter { 8000447ccdSAdrian Hunter struct thread_stack_entry *new_stack; 8100447ccdSAdrian Hunter size_t sz, new_sz; 8200447ccdSAdrian Hunter 8300447ccdSAdrian Hunter new_sz = ts->sz + STACK_GROWTH; 8400447ccdSAdrian Hunter sz = new_sz * sizeof(struct thread_stack_entry); 8500447ccdSAdrian Hunter 8600447ccdSAdrian Hunter new_stack = realloc(ts->stack, sz); 8700447ccdSAdrian Hunter if (!new_stack) 8800447ccdSAdrian Hunter return -ENOMEM; 8900447ccdSAdrian Hunter 9000447ccdSAdrian Hunter ts->stack = new_stack; 9100447ccdSAdrian Hunter ts->sz = new_sz; 9200447ccdSAdrian Hunter 9300447ccdSAdrian Hunter return 0; 9400447ccdSAdrian Hunter } 9500447ccdSAdrian Hunter 9692a9e4f7SAdrian Hunter static struct thread_stack *thread_stack__new(struct thread *thread, 9792a9e4f7SAdrian Hunter struct call_return_processor *crp) 9800447ccdSAdrian Hunter { 9900447ccdSAdrian Hunter struct thread_stack *ts; 10000447ccdSAdrian Hunter 10100447ccdSAdrian Hunter ts = zalloc(sizeof(struct thread_stack)); 10200447ccdSAdrian Hunter if (!ts) 10300447ccdSAdrian Hunter return NULL; 10400447ccdSAdrian Hunter 105f6060ac6SAdrian Hunter ts->arr_sz = 1; 106f6060ac6SAdrian Hunter 10700447ccdSAdrian Hunter if (thread_stack__grow(ts)) { 10800447ccdSAdrian Hunter free(ts); 10900447ccdSAdrian Hunter return NULL; 11000447ccdSAdrian Hunter } 11100447ccdSAdrian Hunter 11292a9e4f7SAdrian Hunter if (thread->mg && thread->mg->machine) 11392a9e4f7SAdrian Hunter ts->kernel_start = machine__kernel_start(thread->mg->machine); 11492a9e4f7SAdrian Hunter else 11592a9e4f7SAdrian Hunter ts->kernel_start = 1ULL << 63; 11692a9e4f7SAdrian Hunter ts->crp = crp; 11792a9e4f7SAdrian Hunter 118bd8e68acSAdrian Hunter thread->ts = ts; 119bd8e68acSAdrian Hunter 12000447ccdSAdrian Hunter return ts; 12100447ccdSAdrian Hunter } 12200447ccdSAdrian Hunter 123bd8e68acSAdrian Hunter static inline struct thread_stack *thread__stack(struct thread *thread) 124bd8e68acSAdrian Hunter { 125bd8e68acSAdrian Hunter return thread ? thread->ts : NULL; 126bd8e68acSAdrian Hunter } 127bd8e68acSAdrian Hunter 1284d60e5e3SAdrian Hunter static int thread_stack__push(struct thread_stack *ts, u64 ret_addr, 1294d60e5e3SAdrian Hunter bool trace_end) 13000447ccdSAdrian Hunter { 13100447ccdSAdrian Hunter int err = 0; 13200447ccdSAdrian Hunter 13300447ccdSAdrian Hunter if (ts->cnt == ts->sz) { 13400447ccdSAdrian Hunter err = thread_stack__grow(ts); 13500447ccdSAdrian Hunter if (err) { 13600447ccdSAdrian Hunter pr_warning("Out of memory: discarding thread stack\n"); 13700447ccdSAdrian Hunter ts->cnt = 0; 13800447ccdSAdrian Hunter } 13900447ccdSAdrian Hunter } 14000447ccdSAdrian Hunter 1414d60e5e3SAdrian Hunter ts->stack[ts->cnt].trace_end = trace_end; 14200447ccdSAdrian Hunter ts->stack[ts->cnt++].ret_addr = ret_addr; 14300447ccdSAdrian Hunter 14400447ccdSAdrian Hunter return err; 14500447ccdSAdrian Hunter } 14600447ccdSAdrian Hunter 14700447ccdSAdrian Hunter static void thread_stack__pop(struct thread_stack *ts, u64 ret_addr) 14800447ccdSAdrian Hunter { 14900447ccdSAdrian Hunter size_t i; 15000447ccdSAdrian Hunter 15100447ccdSAdrian Hunter /* 15200447ccdSAdrian Hunter * In some cases there may be functions which are not seen to return. 15300447ccdSAdrian Hunter * For example when setjmp / longjmp has been used. Or the perf context 15400447ccdSAdrian Hunter * switch in the kernel which doesn't stop and start tracing in exactly 15500447ccdSAdrian Hunter * the same code path. When that happens the return address will be 15600447ccdSAdrian Hunter * further down the stack. If the return address is not found at all, 15700447ccdSAdrian Hunter * we assume the opposite (i.e. this is a return for a call that wasn't 15800447ccdSAdrian Hunter * seen for some reason) and leave the stack alone. 15900447ccdSAdrian Hunter */ 16000447ccdSAdrian Hunter for (i = ts->cnt; i; ) { 16100447ccdSAdrian Hunter if (ts->stack[--i].ret_addr == ret_addr) { 16200447ccdSAdrian Hunter ts->cnt = i; 16300447ccdSAdrian Hunter return; 16400447ccdSAdrian Hunter } 16500447ccdSAdrian Hunter } 16600447ccdSAdrian Hunter } 16700447ccdSAdrian Hunter 1684d60e5e3SAdrian Hunter static void thread_stack__pop_trace_end(struct thread_stack *ts) 1694d60e5e3SAdrian Hunter { 1704d60e5e3SAdrian Hunter size_t i; 1714d60e5e3SAdrian Hunter 1724d60e5e3SAdrian Hunter for (i = ts->cnt; i; ) { 1734d60e5e3SAdrian Hunter if (ts->stack[--i].trace_end) 1744d60e5e3SAdrian Hunter ts->cnt = i; 1754d60e5e3SAdrian Hunter else 1764d60e5e3SAdrian Hunter return; 1774d60e5e3SAdrian Hunter } 1784d60e5e3SAdrian Hunter } 1794d60e5e3SAdrian Hunter 18092a9e4f7SAdrian Hunter static bool thread_stack__in_kernel(struct thread_stack *ts) 18192a9e4f7SAdrian Hunter { 18292a9e4f7SAdrian Hunter if (!ts->cnt) 18392a9e4f7SAdrian Hunter return false; 18492a9e4f7SAdrian Hunter 18592a9e4f7SAdrian Hunter return ts->stack[ts->cnt - 1].cp->in_kernel; 18692a9e4f7SAdrian Hunter } 18792a9e4f7SAdrian Hunter 18892a9e4f7SAdrian Hunter static int thread_stack__call_return(struct thread *thread, 18992a9e4f7SAdrian Hunter struct thread_stack *ts, size_t idx, 19092a9e4f7SAdrian Hunter u64 timestamp, u64 ref, bool no_return) 19192a9e4f7SAdrian Hunter { 19292a9e4f7SAdrian Hunter struct call_return_processor *crp = ts->crp; 19392a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 19492a9e4f7SAdrian Hunter struct call_return cr = { 19592a9e4f7SAdrian Hunter .thread = thread, 19692a9e4f7SAdrian Hunter .comm = ts->comm, 19792a9e4f7SAdrian Hunter .db_id = 0, 19892a9e4f7SAdrian Hunter }; 19992a9e4f7SAdrian Hunter 20092a9e4f7SAdrian Hunter tse = &ts->stack[idx]; 20192a9e4f7SAdrian Hunter cr.cp = tse->cp; 20292a9e4f7SAdrian Hunter cr.call_time = tse->timestamp; 20392a9e4f7SAdrian Hunter cr.return_time = timestamp; 20492a9e4f7SAdrian Hunter cr.branch_count = ts->branch_count - tse->branch_count; 20592a9e4f7SAdrian Hunter cr.call_ref = tse->ref; 20692a9e4f7SAdrian Hunter cr.return_ref = ref; 20792a9e4f7SAdrian Hunter if (tse->no_call) 20892a9e4f7SAdrian Hunter cr.flags |= CALL_RETURN_NO_CALL; 20992a9e4f7SAdrian Hunter if (no_return) 21092a9e4f7SAdrian Hunter cr.flags |= CALL_RETURN_NO_RETURN; 21192a9e4f7SAdrian Hunter 21292a9e4f7SAdrian Hunter return crp->process(&cr, crp->data); 21392a9e4f7SAdrian Hunter } 21492a9e4f7SAdrian Hunter 215a5499b37SAdrian Hunter static int __thread_stack__flush(struct thread *thread, struct thread_stack *ts) 21692a9e4f7SAdrian Hunter { 21792a9e4f7SAdrian Hunter struct call_return_processor *crp = ts->crp; 21892a9e4f7SAdrian Hunter int err; 21992a9e4f7SAdrian Hunter 22092a9e4f7SAdrian Hunter if (!crp) { 22192a9e4f7SAdrian Hunter ts->cnt = 0; 22292a9e4f7SAdrian Hunter return 0; 22392a9e4f7SAdrian Hunter } 22492a9e4f7SAdrian Hunter 22592a9e4f7SAdrian Hunter while (ts->cnt) { 22692a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 22792a9e4f7SAdrian Hunter ts->last_time, 0, true); 22892a9e4f7SAdrian Hunter if (err) { 22992a9e4f7SAdrian Hunter pr_err("Error flushing thread stack!\n"); 23092a9e4f7SAdrian Hunter ts->cnt = 0; 23192a9e4f7SAdrian Hunter return err; 23292a9e4f7SAdrian Hunter } 23392a9e4f7SAdrian Hunter } 23492a9e4f7SAdrian Hunter 23592a9e4f7SAdrian Hunter return 0; 23692a9e4f7SAdrian Hunter } 23792a9e4f7SAdrian Hunter 238a5499b37SAdrian Hunter int thread_stack__flush(struct thread *thread) 239a5499b37SAdrian Hunter { 240bd8e68acSAdrian Hunter struct thread_stack *ts = thread->ts; 241f6060ac6SAdrian Hunter unsigned int pos; 242f6060ac6SAdrian Hunter int err = 0; 243bd8e68acSAdrian Hunter 244f6060ac6SAdrian Hunter if (ts) { 245f6060ac6SAdrian Hunter for (pos = 0; pos < ts->arr_sz; pos++) { 246f6060ac6SAdrian Hunter int ret = __thread_stack__flush(thread, ts + pos); 247a5499b37SAdrian Hunter 248f6060ac6SAdrian Hunter if (ret) 249f6060ac6SAdrian Hunter err = ret; 250f6060ac6SAdrian Hunter } 251f6060ac6SAdrian Hunter } 252f6060ac6SAdrian Hunter 253f6060ac6SAdrian Hunter return err; 254a5499b37SAdrian Hunter } 255a5499b37SAdrian Hunter 25600447ccdSAdrian Hunter int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip, 25700447ccdSAdrian Hunter u64 to_ip, u16 insn_len, u64 trace_nr) 25800447ccdSAdrian Hunter { 259bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 260bd8e68acSAdrian Hunter 26100447ccdSAdrian Hunter if (!thread) 26200447ccdSAdrian Hunter return -EINVAL; 26300447ccdSAdrian Hunter 264bd8e68acSAdrian Hunter if (!ts) { 265bd8e68acSAdrian Hunter ts = thread_stack__new(thread, NULL); 266bd8e68acSAdrian Hunter if (!ts) { 26700447ccdSAdrian Hunter pr_warning("Out of memory: no thread stack\n"); 26800447ccdSAdrian Hunter return -ENOMEM; 26900447ccdSAdrian Hunter } 270bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 27100447ccdSAdrian Hunter } 27200447ccdSAdrian Hunter 27300447ccdSAdrian Hunter /* 27400447ccdSAdrian Hunter * When the trace is discontinuous, the trace_nr changes. In that case 27500447ccdSAdrian Hunter * the stack might be completely invalid. Better to report nothing than 27692a9e4f7SAdrian Hunter * to report something misleading, so flush the stack. 27700447ccdSAdrian Hunter */ 278bd8e68acSAdrian Hunter if (trace_nr != ts->trace_nr) { 279bd8e68acSAdrian Hunter if (ts->trace_nr) 280bd8e68acSAdrian Hunter __thread_stack__flush(thread, ts); 281bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 28200447ccdSAdrian Hunter } 28300447ccdSAdrian Hunter 28492a9e4f7SAdrian Hunter /* Stop here if thread_stack__process() is in use */ 285bd8e68acSAdrian Hunter if (ts->crp) 28692a9e4f7SAdrian Hunter return 0; 28792a9e4f7SAdrian Hunter 28800447ccdSAdrian Hunter if (flags & PERF_IP_FLAG_CALL) { 28900447ccdSAdrian Hunter u64 ret_addr; 29000447ccdSAdrian Hunter 29100447ccdSAdrian Hunter if (!to_ip) 29200447ccdSAdrian Hunter return 0; 29300447ccdSAdrian Hunter ret_addr = from_ip + insn_len; 29400447ccdSAdrian Hunter if (ret_addr == to_ip) 29500447ccdSAdrian Hunter return 0; /* Zero-length calls are excluded */ 296bd8e68acSAdrian Hunter return thread_stack__push(ts, ret_addr, 2974d60e5e3SAdrian Hunter flags & PERF_IP_FLAG_TRACE_END); 2984d60e5e3SAdrian Hunter } else if (flags & PERF_IP_FLAG_TRACE_BEGIN) { 2994d60e5e3SAdrian Hunter /* 3004d60e5e3SAdrian Hunter * If the caller did not change the trace number (which would 3014d60e5e3SAdrian Hunter * have flushed the stack) then try to make sense of the stack. 3024d60e5e3SAdrian Hunter * Possibly, tracing began after returning to the current 3034d60e5e3SAdrian Hunter * address, so try to pop that. Also, do not expect a call made 3044d60e5e3SAdrian Hunter * when the trace ended, to return, so pop that. 3054d60e5e3SAdrian Hunter */ 306bd8e68acSAdrian Hunter thread_stack__pop(ts, to_ip); 307bd8e68acSAdrian Hunter thread_stack__pop_trace_end(ts); 3084d60e5e3SAdrian Hunter } else if ((flags & PERF_IP_FLAG_RETURN) && from_ip) { 309bd8e68acSAdrian Hunter thread_stack__pop(ts, to_ip); 31000447ccdSAdrian Hunter } 31100447ccdSAdrian Hunter 31200447ccdSAdrian Hunter return 0; 31300447ccdSAdrian Hunter } 31400447ccdSAdrian Hunter 31592a9e4f7SAdrian Hunter void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr) 31692a9e4f7SAdrian Hunter { 317bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 318bd8e68acSAdrian Hunter 319bd8e68acSAdrian Hunter if (!ts) 32092a9e4f7SAdrian Hunter return; 32192a9e4f7SAdrian Hunter 322bd8e68acSAdrian Hunter if (trace_nr != ts->trace_nr) { 323bd8e68acSAdrian Hunter if (ts->trace_nr) 324bd8e68acSAdrian Hunter __thread_stack__flush(thread, ts); 325bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 32692a9e4f7SAdrian Hunter } 32792a9e4f7SAdrian Hunter } 32892a9e4f7SAdrian Hunter 329f6060ac6SAdrian Hunter static void __thread_stack__free(struct thread *thread, struct thread_stack *ts) 330f6060ac6SAdrian Hunter { 331f6060ac6SAdrian Hunter __thread_stack__flush(thread, ts); 332f6060ac6SAdrian Hunter zfree(&ts->stack); 333f6060ac6SAdrian Hunter } 334f6060ac6SAdrian Hunter 335f6060ac6SAdrian Hunter static void thread_stack__reset(struct thread *thread, struct thread_stack *ts) 336f6060ac6SAdrian Hunter { 337f6060ac6SAdrian Hunter unsigned int arr_sz = ts->arr_sz; 338f6060ac6SAdrian Hunter 339f6060ac6SAdrian Hunter __thread_stack__free(thread, ts); 340f6060ac6SAdrian Hunter memset(ts, 0, sizeof(*ts)); 341f6060ac6SAdrian Hunter ts->arr_sz = arr_sz; 342f6060ac6SAdrian Hunter } 343f6060ac6SAdrian Hunter 34400447ccdSAdrian Hunter void thread_stack__free(struct thread *thread) 34500447ccdSAdrian Hunter { 346bd8e68acSAdrian Hunter struct thread_stack *ts = thread->ts; 347f6060ac6SAdrian Hunter unsigned int pos; 348bd8e68acSAdrian Hunter 349bd8e68acSAdrian Hunter if (ts) { 350f6060ac6SAdrian Hunter for (pos = 0; pos < ts->arr_sz; pos++) 351f6060ac6SAdrian Hunter __thread_stack__free(thread, ts + pos); 35200447ccdSAdrian Hunter zfree(&thread->ts); 35300447ccdSAdrian Hunter } 35400447ccdSAdrian Hunter } 35500447ccdSAdrian Hunter 35624248306SAdrian Hunter static inline u64 callchain_context(u64 ip, u64 kernel_start) 35700447ccdSAdrian Hunter { 35824248306SAdrian Hunter return ip < kernel_start ? PERF_CONTEXT_USER : PERF_CONTEXT_KERNEL; 35924248306SAdrian Hunter } 36000447ccdSAdrian Hunter 36124248306SAdrian Hunter void thread_stack__sample(struct thread *thread, struct ip_callchain *chain, 36224248306SAdrian Hunter size_t sz, u64 ip, u64 kernel_start) 36324248306SAdrian Hunter { 364bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 36524248306SAdrian Hunter u64 context = callchain_context(ip, kernel_start); 36624248306SAdrian Hunter u64 last_context; 36724248306SAdrian Hunter size_t i, j; 36800447ccdSAdrian Hunter 36924248306SAdrian Hunter if (sz < 2) { 37024248306SAdrian Hunter chain->nr = 0; 37124248306SAdrian Hunter return; 37224248306SAdrian Hunter } 37300447ccdSAdrian Hunter 37424248306SAdrian Hunter chain->ips[0] = context; 37524248306SAdrian Hunter chain->ips[1] = ip; 37624248306SAdrian Hunter 377bd8e68acSAdrian Hunter if (!ts) { 37824248306SAdrian Hunter chain->nr = 2; 37924248306SAdrian Hunter return; 38024248306SAdrian Hunter } 38124248306SAdrian Hunter 38224248306SAdrian Hunter last_context = context; 38324248306SAdrian Hunter 384bd8e68acSAdrian Hunter for (i = 2, j = 1; i < sz && j <= ts->cnt; i++, j++) { 385bd8e68acSAdrian Hunter ip = ts->stack[ts->cnt - j].ret_addr; 38624248306SAdrian Hunter context = callchain_context(ip, kernel_start); 38724248306SAdrian Hunter if (context != last_context) { 38824248306SAdrian Hunter if (i >= sz - 1) 38924248306SAdrian Hunter break; 39024248306SAdrian Hunter chain->ips[i++] = context; 39124248306SAdrian Hunter last_context = context; 39224248306SAdrian Hunter } 39324248306SAdrian Hunter chain->ips[i] = ip; 39424248306SAdrian Hunter } 39524248306SAdrian Hunter 39624248306SAdrian Hunter chain->nr = i; 39700447ccdSAdrian Hunter } 39892a9e4f7SAdrian Hunter 39992a9e4f7SAdrian Hunter struct call_return_processor * 40092a9e4f7SAdrian Hunter call_return_processor__new(int (*process)(struct call_return *cr, void *data), 40192a9e4f7SAdrian Hunter void *data) 40292a9e4f7SAdrian Hunter { 40392a9e4f7SAdrian Hunter struct call_return_processor *crp; 40492a9e4f7SAdrian Hunter 40592a9e4f7SAdrian Hunter crp = zalloc(sizeof(struct call_return_processor)); 40692a9e4f7SAdrian Hunter if (!crp) 40792a9e4f7SAdrian Hunter return NULL; 40892a9e4f7SAdrian Hunter crp->cpr = call_path_root__new(); 40992a9e4f7SAdrian Hunter if (!crp->cpr) 41092a9e4f7SAdrian Hunter goto out_free; 41192a9e4f7SAdrian Hunter crp->process = process; 41292a9e4f7SAdrian Hunter crp->data = data; 41392a9e4f7SAdrian Hunter return crp; 41492a9e4f7SAdrian Hunter 41592a9e4f7SAdrian Hunter out_free: 41692a9e4f7SAdrian Hunter free(crp); 41792a9e4f7SAdrian Hunter return NULL; 41892a9e4f7SAdrian Hunter } 41992a9e4f7SAdrian Hunter 42092a9e4f7SAdrian Hunter void call_return_processor__free(struct call_return_processor *crp) 42192a9e4f7SAdrian Hunter { 42292a9e4f7SAdrian Hunter if (crp) { 42392a9e4f7SAdrian Hunter call_path_root__free(crp->cpr); 42492a9e4f7SAdrian Hunter free(crp); 42592a9e4f7SAdrian Hunter } 42692a9e4f7SAdrian Hunter } 42792a9e4f7SAdrian Hunter 42892a9e4f7SAdrian Hunter static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr, 42992a9e4f7SAdrian Hunter u64 timestamp, u64 ref, struct call_path *cp, 4302dcde4e1SAdrian Hunter bool no_call, bool trace_end) 43192a9e4f7SAdrian Hunter { 43292a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 43392a9e4f7SAdrian Hunter int err; 43492a9e4f7SAdrian Hunter 43592a9e4f7SAdrian Hunter if (ts->cnt == ts->sz) { 43692a9e4f7SAdrian Hunter err = thread_stack__grow(ts); 43792a9e4f7SAdrian Hunter if (err) 43892a9e4f7SAdrian Hunter return err; 43992a9e4f7SAdrian Hunter } 44092a9e4f7SAdrian Hunter 44192a9e4f7SAdrian Hunter tse = &ts->stack[ts->cnt++]; 44292a9e4f7SAdrian Hunter tse->ret_addr = ret_addr; 44392a9e4f7SAdrian Hunter tse->timestamp = timestamp; 44492a9e4f7SAdrian Hunter tse->ref = ref; 44592a9e4f7SAdrian Hunter tse->branch_count = ts->branch_count; 44692a9e4f7SAdrian Hunter tse->cp = cp; 44792a9e4f7SAdrian Hunter tse->no_call = no_call; 4482dcde4e1SAdrian Hunter tse->trace_end = trace_end; 44992a9e4f7SAdrian Hunter 45092a9e4f7SAdrian Hunter return 0; 45192a9e4f7SAdrian Hunter } 45292a9e4f7SAdrian Hunter 45392a9e4f7SAdrian Hunter static int thread_stack__pop_cp(struct thread *thread, struct thread_stack *ts, 45492a9e4f7SAdrian Hunter u64 ret_addr, u64 timestamp, u64 ref, 45592a9e4f7SAdrian Hunter struct symbol *sym) 45692a9e4f7SAdrian Hunter { 45792a9e4f7SAdrian Hunter int err; 45892a9e4f7SAdrian Hunter 45992a9e4f7SAdrian Hunter if (!ts->cnt) 46092a9e4f7SAdrian Hunter return 1; 46192a9e4f7SAdrian Hunter 46292a9e4f7SAdrian Hunter if (ts->cnt == 1) { 46392a9e4f7SAdrian Hunter struct thread_stack_entry *tse = &ts->stack[0]; 46492a9e4f7SAdrian Hunter 46592a9e4f7SAdrian Hunter if (tse->cp->sym == sym) 46692a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 46792a9e4f7SAdrian Hunter timestamp, ref, false); 46892a9e4f7SAdrian Hunter } 46992a9e4f7SAdrian Hunter 47092a9e4f7SAdrian Hunter if (ts->stack[ts->cnt - 1].ret_addr == ret_addr) { 47192a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 47292a9e4f7SAdrian Hunter timestamp, ref, false); 47392a9e4f7SAdrian Hunter } else { 47492a9e4f7SAdrian Hunter size_t i = ts->cnt - 1; 47592a9e4f7SAdrian Hunter 47692a9e4f7SAdrian Hunter while (i--) { 47792a9e4f7SAdrian Hunter if (ts->stack[i].ret_addr != ret_addr) 47892a9e4f7SAdrian Hunter continue; 47992a9e4f7SAdrian Hunter i += 1; 48092a9e4f7SAdrian Hunter while (ts->cnt > i) { 48192a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, 48292a9e4f7SAdrian Hunter --ts->cnt, 48392a9e4f7SAdrian Hunter timestamp, ref, 48492a9e4f7SAdrian Hunter true); 48592a9e4f7SAdrian Hunter if (err) 48692a9e4f7SAdrian Hunter return err; 48792a9e4f7SAdrian Hunter } 48892a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 48992a9e4f7SAdrian Hunter timestamp, ref, false); 49092a9e4f7SAdrian Hunter } 49192a9e4f7SAdrian Hunter } 49292a9e4f7SAdrian Hunter 49392a9e4f7SAdrian Hunter return 1; 49492a9e4f7SAdrian Hunter } 49592a9e4f7SAdrian Hunter 496e0b89511SAdrian Hunter static int thread_stack__bottom(struct thread_stack *ts, 49792a9e4f7SAdrian Hunter struct perf_sample *sample, 49892a9e4f7SAdrian Hunter struct addr_location *from_al, 49992a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref) 50092a9e4f7SAdrian Hunter { 50192a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 50292a9e4f7SAdrian Hunter struct call_path *cp; 50392a9e4f7SAdrian Hunter struct symbol *sym; 50492a9e4f7SAdrian Hunter u64 ip; 50592a9e4f7SAdrian Hunter 50692a9e4f7SAdrian Hunter if (sample->ip) { 50792a9e4f7SAdrian Hunter ip = sample->ip; 50892a9e4f7SAdrian Hunter sym = from_al->sym; 50992a9e4f7SAdrian Hunter } else if (sample->addr) { 51092a9e4f7SAdrian Hunter ip = sample->addr; 51192a9e4f7SAdrian Hunter sym = to_al->sym; 51292a9e4f7SAdrian Hunter } else { 51392a9e4f7SAdrian Hunter return 0; 51492a9e4f7SAdrian Hunter } 51592a9e4f7SAdrian Hunter 51692a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, &cpr->call_path, sym, ip, 51792a9e4f7SAdrian Hunter ts->kernel_start); 51892a9e4f7SAdrian Hunter if (!cp) 51992a9e4f7SAdrian Hunter return -ENOMEM; 52092a9e4f7SAdrian Hunter 521e0b89511SAdrian Hunter return thread_stack__push_cp(ts, ip, sample->time, ref, cp, 5222dcde4e1SAdrian Hunter true, false); 52392a9e4f7SAdrian Hunter } 52492a9e4f7SAdrian Hunter 52592a9e4f7SAdrian Hunter static int thread_stack__no_call_return(struct thread *thread, 52692a9e4f7SAdrian Hunter struct thread_stack *ts, 52792a9e4f7SAdrian Hunter struct perf_sample *sample, 52892a9e4f7SAdrian Hunter struct addr_location *from_al, 52992a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref) 53092a9e4f7SAdrian Hunter { 53192a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 53292a9e4f7SAdrian Hunter struct call_path *cp, *parent; 53392a9e4f7SAdrian Hunter u64 ks = ts->kernel_start; 53492a9e4f7SAdrian Hunter int err; 53592a9e4f7SAdrian Hunter 53692a9e4f7SAdrian Hunter if (sample->ip >= ks && sample->addr < ks) { 53792a9e4f7SAdrian Hunter /* Return to userspace, so pop all kernel addresses */ 53892a9e4f7SAdrian Hunter while (thread_stack__in_kernel(ts)) { 53992a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 54092a9e4f7SAdrian Hunter sample->time, ref, 54192a9e4f7SAdrian Hunter true); 54292a9e4f7SAdrian Hunter if (err) 54392a9e4f7SAdrian Hunter return err; 54492a9e4f7SAdrian Hunter } 54592a9e4f7SAdrian Hunter 54692a9e4f7SAdrian Hunter /* If the stack is empty, push the userspace address */ 54792a9e4f7SAdrian Hunter if (!ts->cnt) { 54892a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, &cpr->call_path, 54992a9e4f7SAdrian Hunter to_al->sym, sample->addr, 55092a9e4f7SAdrian Hunter ts->kernel_start); 55192a9e4f7SAdrian Hunter if (!cp) 55292a9e4f7SAdrian Hunter return -ENOMEM; 55392a9e4f7SAdrian Hunter return thread_stack__push_cp(ts, 0, sample->time, ref, 5542dcde4e1SAdrian Hunter cp, true, false); 55592a9e4f7SAdrian Hunter } 55692a9e4f7SAdrian Hunter } else if (thread_stack__in_kernel(ts) && sample->ip < ks) { 55792a9e4f7SAdrian Hunter /* Return to userspace, so pop all kernel addresses */ 55892a9e4f7SAdrian Hunter while (thread_stack__in_kernel(ts)) { 55992a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 56092a9e4f7SAdrian Hunter sample->time, ref, 56192a9e4f7SAdrian Hunter true); 56292a9e4f7SAdrian Hunter if (err) 56392a9e4f7SAdrian Hunter return err; 56492a9e4f7SAdrian Hunter } 56592a9e4f7SAdrian Hunter } 56692a9e4f7SAdrian Hunter 56792a9e4f7SAdrian Hunter if (ts->cnt) 56892a9e4f7SAdrian Hunter parent = ts->stack[ts->cnt - 1].cp; 56992a9e4f7SAdrian Hunter else 57092a9e4f7SAdrian Hunter parent = &cpr->call_path; 57192a9e4f7SAdrian Hunter 57292a9e4f7SAdrian Hunter /* This 'return' had no 'call', so push and pop top of stack */ 57392a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, parent, from_al->sym, sample->ip, 57492a9e4f7SAdrian Hunter ts->kernel_start); 57592a9e4f7SAdrian Hunter if (!cp) 57692a9e4f7SAdrian Hunter return -ENOMEM; 57792a9e4f7SAdrian Hunter 57892a9e4f7SAdrian Hunter err = thread_stack__push_cp(ts, sample->addr, sample->time, ref, cp, 5792dcde4e1SAdrian Hunter true, false); 58092a9e4f7SAdrian Hunter if (err) 58192a9e4f7SAdrian Hunter return err; 58292a9e4f7SAdrian Hunter 58392a9e4f7SAdrian Hunter return thread_stack__pop_cp(thread, ts, sample->addr, sample->time, ref, 58492a9e4f7SAdrian Hunter to_al->sym); 58592a9e4f7SAdrian Hunter } 58692a9e4f7SAdrian Hunter 58792a9e4f7SAdrian Hunter static int thread_stack__trace_begin(struct thread *thread, 58892a9e4f7SAdrian Hunter struct thread_stack *ts, u64 timestamp, 58992a9e4f7SAdrian Hunter u64 ref) 59092a9e4f7SAdrian Hunter { 59192a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 59292a9e4f7SAdrian Hunter int err; 59392a9e4f7SAdrian Hunter 59492a9e4f7SAdrian Hunter if (!ts->cnt) 59592a9e4f7SAdrian Hunter return 0; 59692a9e4f7SAdrian Hunter 59792a9e4f7SAdrian Hunter /* Pop trace end */ 59892a9e4f7SAdrian Hunter tse = &ts->stack[ts->cnt - 1]; 5992dcde4e1SAdrian Hunter if (tse->trace_end) { 60092a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 60192a9e4f7SAdrian Hunter timestamp, ref, false); 60292a9e4f7SAdrian Hunter if (err) 60392a9e4f7SAdrian Hunter return err; 60492a9e4f7SAdrian Hunter } 60592a9e4f7SAdrian Hunter 60692a9e4f7SAdrian Hunter return 0; 60792a9e4f7SAdrian Hunter } 60892a9e4f7SAdrian Hunter 60992a9e4f7SAdrian Hunter static int thread_stack__trace_end(struct thread_stack *ts, 61092a9e4f7SAdrian Hunter struct perf_sample *sample, u64 ref) 61192a9e4f7SAdrian Hunter { 61292a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 61392a9e4f7SAdrian Hunter struct call_path *cp; 61492a9e4f7SAdrian Hunter u64 ret_addr; 61592a9e4f7SAdrian Hunter 61692a9e4f7SAdrian Hunter /* No point having 'trace end' on the bottom of the stack */ 61792a9e4f7SAdrian Hunter if (!ts->cnt || (ts->cnt == 1 && ts->stack[0].ref == ref)) 61892a9e4f7SAdrian Hunter return 0; 61992a9e4f7SAdrian Hunter 62092a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, NULL, 0, 62192a9e4f7SAdrian Hunter ts->kernel_start); 62292a9e4f7SAdrian Hunter if (!cp) 62392a9e4f7SAdrian Hunter return -ENOMEM; 62492a9e4f7SAdrian Hunter 62592a9e4f7SAdrian Hunter ret_addr = sample->ip + sample->insn_len; 62692a9e4f7SAdrian Hunter 62792a9e4f7SAdrian Hunter return thread_stack__push_cp(ts, ret_addr, sample->time, ref, cp, 6282dcde4e1SAdrian Hunter false, true); 62992a9e4f7SAdrian Hunter } 63092a9e4f7SAdrian Hunter 63192a9e4f7SAdrian Hunter int thread_stack__process(struct thread *thread, struct comm *comm, 63292a9e4f7SAdrian Hunter struct perf_sample *sample, 63392a9e4f7SAdrian Hunter struct addr_location *from_al, 63492a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref, 63592a9e4f7SAdrian Hunter struct call_return_processor *crp) 63692a9e4f7SAdrian Hunter { 637bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 63892a9e4f7SAdrian Hunter int err = 0; 63992a9e4f7SAdrian Hunter 64003b32cb2SAdrian Hunter if (ts && !ts->crp) { 64192a9e4f7SAdrian Hunter /* Supersede thread_stack__event() */ 642f6060ac6SAdrian Hunter thread_stack__reset(thread, ts); 64303b32cb2SAdrian Hunter ts = NULL; 64492a9e4f7SAdrian Hunter } 64503b32cb2SAdrian Hunter 64603b32cb2SAdrian Hunter if (!ts) { 647bd8e68acSAdrian Hunter ts = thread_stack__new(thread, crp); 648bd8e68acSAdrian Hunter if (!ts) 64992a9e4f7SAdrian Hunter return -ENOMEM; 65092a9e4f7SAdrian Hunter ts->comm = comm; 65192a9e4f7SAdrian Hunter } 65292a9e4f7SAdrian Hunter 65392a9e4f7SAdrian Hunter /* Flush stack on exec */ 65492a9e4f7SAdrian Hunter if (ts->comm != comm && thread->pid_ == thread->tid) { 655a5499b37SAdrian Hunter err = __thread_stack__flush(thread, ts); 65692a9e4f7SAdrian Hunter if (err) 65792a9e4f7SAdrian Hunter return err; 65892a9e4f7SAdrian Hunter ts->comm = comm; 65992a9e4f7SAdrian Hunter } 66092a9e4f7SAdrian Hunter 66192a9e4f7SAdrian Hunter /* If the stack is empty, put the current symbol on the stack */ 66292a9e4f7SAdrian Hunter if (!ts->cnt) { 663e0b89511SAdrian Hunter err = thread_stack__bottom(ts, sample, from_al, to_al, ref); 66492a9e4f7SAdrian Hunter if (err) 66592a9e4f7SAdrian Hunter return err; 66692a9e4f7SAdrian Hunter } 66792a9e4f7SAdrian Hunter 66892a9e4f7SAdrian Hunter ts->branch_count += 1; 66992a9e4f7SAdrian Hunter ts->last_time = sample->time; 67092a9e4f7SAdrian Hunter 67192a9e4f7SAdrian Hunter if (sample->flags & PERF_IP_FLAG_CALL) { 6722dcde4e1SAdrian Hunter bool trace_end = sample->flags & PERF_IP_FLAG_TRACE_END; 67392a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 67492a9e4f7SAdrian Hunter struct call_path *cp; 67592a9e4f7SAdrian Hunter u64 ret_addr; 67692a9e4f7SAdrian Hunter 67792a9e4f7SAdrian Hunter if (!sample->ip || !sample->addr) 67892a9e4f7SAdrian Hunter return 0; 67992a9e4f7SAdrian Hunter 68092a9e4f7SAdrian Hunter ret_addr = sample->ip + sample->insn_len; 68192a9e4f7SAdrian Hunter if (ret_addr == sample->addr) 68292a9e4f7SAdrian Hunter return 0; /* Zero-length calls are excluded */ 68392a9e4f7SAdrian Hunter 68492a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, 68592a9e4f7SAdrian Hunter to_al->sym, sample->addr, 68692a9e4f7SAdrian Hunter ts->kernel_start); 68792a9e4f7SAdrian Hunter if (!cp) 68892a9e4f7SAdrian Hunter return -ENOMEM; 68992a9e4f7SAdrian Hunter err = thread_stack__push_cp(ts, ret_addr, sample->time, ref, 6902dcde4e1SAdrian Hunter cp, false, trace_end); 69192a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_RETURN) { 69292a9e4f7SAdrian Hunter if (!sample->ip || !sample->addr) 69392a9e4f7SAdrian Hunter return 0; 69492a9e4f7SAdrian Hunter 69592a9e4f7SAdrian Hunter err = thread_stack__pop_cp(thread, ts, sample->addr, 69692a9e4f7SAdrian Hunter sample->time, ref, from_al->sym); 69792a9e4f7SAdrian Hunter if (err) { 69892a9e4f7SAdrian Hunter if (err < 0) 69992a9e4f7SAdrian Hunter return err; 70092a9e4f7SAdrian Hunter err = thread_stack__no_call_return(thread, ts, sample, 70192a9e4f7SAdrian Hunter from_al, to_al, ref); 70292a9e4f7SAdrian Hunter } 70392a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_TRACE_BEGIN) { 70492a9e4f7SAdrian Hunter err = thread_stack__trace_begin(thread, ts, sample->time, ref); 70592a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_TRACE_END) { 70692a9e4f7SAdrian Hunter err = thread_stack__trace_end(ts, sample, ref); 70792a9e4f7SAdrian Hunter } 70892a9e4f7SAdrian Hunter 70992a9e4f7SAdrian Hunter return err; 71092a9e4f7SAdrian Hunter } 711e216708dSAdrian Hunter 712e216708dSAdrian Hunter size_t thread_stack__depth(struct thread *thread) 713e216708dSAdrian Hunter { 714bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 715bd8e68acSAdrian Hunter 716bd8e68acSAdrian Hunter if (!ts) 717e216708dSAdrian Hunter return 0; 718bd8e68acSAdrian Hunter return ts->cnt; 719e216708dSAdrian Hunter } 720