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 6392a9e4f7SAdrian Hunter */ 6400447ccdSAdrian Hunter struct thread_stack { 6500447ccdSAdrian Hunter struct thread_stack_entry *stack; 6600447ccdSAdrian Hunter size_t cnt; 6700447ccdSAdrian Hunter size_t sz; 6800447ccdSAdrian Hunter u64 trace_nr; 6992a9e4f7SAdrian Hunter u64 branch_count; 7092a9e4f7SAdrian Hunter u64 kernel_start; 7192a9e4f7SAdrian Hunter u64 last_time; 7292a9e4f7SAdrian Hunter struct call_return_processor *crp; 7392a9e4f7SAdrian Hunter struct comm *comm; 7400447ccdSAdrian Hunter }; 7500447ccdSAdrian Hunter 7600447ccdSAdrian Hunter static int thread_stack__grow(struct thread_stack *ts) 7700447ccdSAdrian Hunter { 7800447ccdSAdrian Hunter struct thread_stack_entry *new_stack; 7900447ccdSAdrian Hunter size_t sz, new_sz; 8000447ccdSAdrian Hunter 8100447ccdSAdrian Hunter new_sz = ts->sz + STACK_GROWTH; 8200447ccdSAdrian Hunter sz = new_sz * sizeof(struct thread_stack_entry); 8300447ccdSAdrian Hunter 8400447ccdSAdrian Hunter new_stack = realloc(ts->stack, sz); 8500447ccdSAdrian Hunter if (!new_stack) 8600447ccdSAdrian Hunter return -ENOMEM; 8700447ccdSAdrian Hunter 8800447ccdSAdrian Hunter ts->stack = new_stack; 8900447ccdSAdrian Hunter ts->sz = new_sz; 9000447ccdSAdrian Hunter 9100447ccdSAdrian Hunter return 0; 9200447ccdSAdrian Hunter } 9300447ccdSAdrian Hunter 9492a9e4f7SAdrian Hunter static struct thread_stack *thread_stack__new(struct thread *thread, 9592a9e4f7SAdrian Hunter struct call_return_processor *crp) 9600447ccdSAdrian Hunter { 9700447ccdSAdrian Hunter struct thread_stack *ts; 9800447ccdSAdrian Hunter 9900447ccdSAdrian Hunter ts = zalloc(sizeof(struct thread_stack)); 10000447ccdSAdrian Hunter if (!ts) 10100447ccdSAdrian Hunter return NULL; 10200447ccdSAdrian Hunter 10300447ccdSAdrian Hunter if (thread_stack__grow(ts)) { 10400447ccdSAdrian Hunter free(ts); 10500447ccdSAdrian Hunter return NULL; 10600447ccdSAdrian Hunter } 10700447ccdSAdrian Hunter 10892a9e4f7SAdrian Hunter if (thread->mg && thread->mg->machine) 10992a9e4f7SAdrian Hunter ts->kernel_start = machine__kernel_start(thread->mg->machine); 11092a9e4f7SAdrian Hunter else 11192a9e4f7SAdrian Hunter ts->kernel_start = 1ULL << 63; 11292a9e4f7SAdrian Hunter ts->crp = crp; 11392a9e4f7SAdrian Hunter 114bd8e68acSAdrian Hunter thread->ts = ts; 115bd8e68acSAdrian Hunter 11600447ccdSAdrian Hunter return ts; 11700447ccdSAdrian Hunter } 11800447ccdSAdrian Hunter 119bd8e68acSAdrian Hunter static inline struct thread_stack *thread__stack(struct thread *thread) 120bd8e68acSAdrian Hunter { 121bd8e68acSAdrian Hunter return thread ? thread->ts : NULL; 122bd8e68acSAdrian Hunter } 123bd8e68acSAdrian Hunter 1244d60e5e3SAdrian Hunter static int thread_stack__push(struct thread_stack *ts, u64 ret_addr, 1254d60e5e3SAdrian Hunter bool trace_end) 12600447ccdSAdrian Hunter { 12700447ccdSAdrian Hunter int err = 0; 12800447ccdSAdrian Hunter 12900447ccdSAdrian Hunter if (ts->cnt == ts->sz) { 13000447ccdSAdrian Hunter err = thread_stack__grow(ts); 13100447ccdSAdrian Hunter if (err) { 13200447ccdSAdrian Hunter pr_warning("Out of memory: discarding thread stack\n"); 13300447ccdSAdrian Hunter ts->cnt = 0; 13400447ccdSAdrian Hunter } 13500447ccdSAdrian Hunter } 13600447ccdSAdrian Hunter 1374d60e5e3SAdrian Hunter ts->stack[ts->cnt].trace_end = trace_end; 13800447ccdSAdrian Hunter ts->stack[ts->cnt++].ret_addr = ret_addr; 13900447ccdSAdrian Hunter 14000447ccdSAdrian Hunter return err; 14100447ccdSAdrian Hunter } 14200447ccdSAdrian Hunter 14300447ccdSAdrian Hunter static void thread_stack__pop(struct thread_stack *ts, u64 ret_addr) 14400447ccdSAdrian Hunter { 14500447ccdSAdrian Hunter size_t i; 14600447ccdSAdrian Hunter 14700447ccdSAdrian Hunter /* 14800447ccdSAdrian Hunter * In some cases there may be functions which are not seen to return. 14900447ccdSAdrian Hunter * For example when setjmp / longjmp has been used. Or the perf context 15000447ccdSAdrian Hunter * switch in the kernel which doesn't stop and start tracing in exactly 15100447ccdSAdrian Hunter * the same code path. When that happens the return address will be 15200447ccdSAdrian Hunter * further down the stack. If the return address is not found at all, 15300447ccdSAdrian Hunter * we assume the opposite (i.e. this is a return for a call that wasn't 15400447ccdSAdrian Hunter * seen for some reason) and leave the stack alone. 15500447ccdSAdrian Hunter */ 15600447ccdSAdrian Hunter for (i = ts->cnt; i; ) { 15700447ccdSAdrian Hunter if (ts->stack[--i].ret_addr == ret_addr) { 15800447ccdSAdrian Hunter ts->cnt = i; 15900447ccdSAdrian Hunter return; 16000447ccdSAdrian Hunter } 16100447ccdSAdrian Hunter } 16200447ccdSAdrian Hunter } 16300447ccdSAdrian Hunter 1644d60e5e3SAdrian Hunter static void thread_stack__pop_trace_end(struct thread_stack *ts) 1654d60e5e3SAdrian Hunter { 1664d60e5e3SAdrian Hunter size_t i; 1674d60e5e3SAdrian Hunter 1684d60e5e3SAdrian Hunter for (i = ts->cnt; i; ) { 1694d60e5e3SAdrian Hunter if (ts->stack[--i].trace_end) 1704d60e5e3SAdrian Hunter ts->cnt = i; 1714d60e5e3SAdrian Hunter else 1724d60e5e3SAdrian Hunter return; 1734d60e5e3SAdrian Hunter } 1744d60e5e3SAdrian Hunter } 1754d60e5e3SAdrian Hunter 17692a9e4f7SAdrian Hunter static bool thread_stack__in_kernel(struct thread_stack *ts) 17792a9e4f7SAdrian Hunter { 17892a9e4f7SAdrian Hunter if (!ts->cnt) 17992a9e4f7SAdrian Hunter return false; 18092a9e4f7SAdrian Hunter 18192a9e4f7SAdrian Hunter return ts->stack[ts->cnt - 1].cp->in_kernel; 18292a9e4f7SAdrian Hunter } 18392a9e4f7SAdrian Hunter 18492a9e4f7SAdrian Hunter static int thread_stack__call_return(struct thread *thread, 18592a9e4f7SAdrian Hunter struct thread_stack *ts, size_t idx, 18692a9e4f7SAdrian Hunter u64 timestamp, u64 ref, bool no_return) 18792a9e4f7SAdrian Hunter { 18892a9e4f7SAdrian Hunter struct call_return_processor *crp = ts->crp; 18992a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 19092a9e4f7SAdrian Hunter struct call_return cr = { 19192a9e4f7SAdrian Hunter .thread = thread, 19292a9e4f7SAdrian Hunter .comm = ts->comm, 19392a9e4f7SAdrian Hunter .db_id = 0, 19492a9e4f7SAdrian Hunter }; 19592a9e4f7SAdrian Hunter 19692a9e4f7SAdrian Hunter tse = &ts->stack[idx]; 19792a9e4f7SAdrian Hunter cr.cp = tse->cp; 19892a9e4f7SAdrian Hunter cr.call_time = tse->timestamp; 19992a9e4f7SAdrian Hunter cr.return_time = timestamp; 20092a9e4f7SAdrian Hunter cr.branch_count = ts->branch_count - tse->branch_count; 20192a9e4f7SAdrian Hunter cr.call_ref = tse->ref; 20292a9e4f7SAdrian Hunter cr.return_ref = ref; 20392a9e4f7SAdrian Hunter if (tse->no_call) 20492a9e4f7SAdrian Hunter cr.flags |= CALL_RETURN_NO_CALL; 20592a9e4f7SAdrian Hunter if (no_return) 20692a9e4f7SAdrian Hunter cr.flags |= CALL_RETURN_NO_RETURN; 20792a9e4f7SAdrian Hunter 20892a9e4f7SAdrian Hunter return crp->process(&cr, crp->data); 20992a9e4f7SAdrian Hunter } 21092a9e4f7SAdrian Hunter 211a5499b37SAdrian Hunter static int __thread_stack__flush(struct thread *thread, struct thread_stack *ts) 21292a9e4f7SAdrian Hunter { 21392a9e4f7SAdrian Hunter struct call_return_processor *crp = ts->crp; 21492a9e4f7SAdrian Hunter int err; 21592a9e4f7SAdrian Hunter 21692a9e4f7SAdrian Hunter if (!crp) { 21792a9e4f7SAdrian Hunter ts->cnt = 0; 21892a9e4f7SAdrian Hunter return 0; 21992a9e4f7SAdrian Hunter } 22092a9e4f7SAdrian Hunter 22192a9e4f7SAdrian Hunter while (ts->cnt) { 22292a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 22392a9e4f7SAdrian Hunter ts->last_time, 0, true); 22492a9e4f7SAdrian Hunter if (err) { 22592a9e4f7SAdrian Hunter pr_err("Error flushing thread stack!\n"); 22692a9e4f7SAdrian Hunter ts->cnt = 0; 22792a9e4f7SAdrian Hunter return err; 22892a9e4f7SAdrian Hunter } 22992a9e4f7SAdrian Hunter } 23092a9e4f7SAdrian Hunter 23192a9e4f7SAdrian Hunter return 0; 23292a9e4f7SAdrian Hunter } 23392a9e4f7SAdrian Hunter 234a5499b37SAdrian Hunter int thread_stack__flush(struct thread *thread) 235a5499b37SAdrian Hunter { 236bd8e68acSAdrian Hunter struct thread_stack *ts = thread->ts; 237bd8e68acSAdrian Hunter 238bd8e68acSAdrian Hunter if (ts) 239bd8e68acSAdrian Hunter return __thread_stack__flush(thread, ts); 240a5499b37SAdrian Hunter 241a5499b37SAdrian Hunter return 0; 242a5499b37SAdrian Hunter } 243a5499b37SAdrian Hunter 24400447ccdSAdrian Hunter int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip, 24500447ccdSAdrian Hunter u64 to_ip, u16 insn_len, u64 trace_nr) 24600447ccdSAdrian Hunter { 247bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 248bd8e68acSAdrian Hunter 24900447ccdSAdrian Hunter if (!thread) 25000447ccdSAdrian Hunter return -EINVAL; 25100447ccdSAdrian Hunter 252bd8e68acSAdrian Hunter if (!ts) { 253bd8e68acSAdrian Hunter ts = thread_stack__new(thread, NULL); 254bd8e68acSAdrian Hunter if (!ts) { 25500447ccdSAdrian Hunter pr_warning("Out of memory: no thread stack\n"); 25600447ccdSAdrian Hunter return -ENOMEM; 25700447ccdSAdrian Hunter } 258bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 25900447ccdSAdrian Hunter } 26000447ccdSAdrian Hunter 26100447ccdSAdrian Hunter /* 26200447ccdSAdrian Hunter * When the trace is discontinuous, the trace_nr changes. In that case 26300447ccdSAdrian Hunter * the stack might be completely invalid. Better to report nothing than 26492a9e4f7SAdrian Hunter * to report something misleading, so flush the stack. 26500447ccdSAdrian Hunter */ 266bd8e68acSAdrian Hunter if (trace_nr != ts->trace_nr) { 267bd8e68acSAdrian Hunter if (ts->trace_nr) 268bd8e68acSAdrian Hunter __thread_stack__flush(thread, ts); 269bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 27000447ccdSAdrian Hunter } 27100447ccdSAdrian Hunter 27292a9e4f7SAdrian Hunter /* Stop here if thread_stack__process() is in use */ 273bd8e68acSAdrian Hunter if (ts->crp) 27492a9e4f7SAdrian Hunter return 0; 27592a9e4f7SAdrian Hunter 27600447ccdSAdrian Hunter if (flags & PERF_IP_FLAG_CALL) { 27700447ccdSAdrian Hunter u64 ret_addr; 27800447ccdSAdrian Hunter 27900447ccdSAdrian Hunter if (!to_ip) 28000447ccdSAdrian Hunter return 0; 28100447ccdSAdrian Hunter ret_addr = from_ip + insn_len; 28200447ccdSAdrian Hunter if (ret_addr == to_ip) 28300447ccdSAdrian Hunter return 0; /* Zero-length calls are excluded */ 284bd8e68acSAdrian Hunter return thread_stack__push(ts, ret_addr, 2854d60e5e3SAdrian Hunter flags & PERF_IP_FLAG_TRACE_END); 2864d60e5e3SAdrian Hunter } else if (flags & PERF_IP_FLAG_TRACE_BEGIN) { 2874d60e5e3SAdrian Hunter /* 2884d60e5e3SAdrian Hunter * If the caller did not change the trace number (which would 2894d60e5e3SAdrian Hunter * have flushed the stack) then try to make sense of the stack. 2904d60e5e3SAdrian Hunter * Possibly, tracing began after returning to the current 2914d60e5e3SAdrian Hunter * address, so try to pop that. Also, do not expect a call made 2924d60e5e3SAdrian Hunter * when the trace ended, to return, so pop that. 2934d60e5e3SAdrian Hunter */ 294bd8e68acSAdrian Hunter thread_stack__pop(ts, to_ip); 295bd8e68acSAdrian Hunter thread_stack__pop_trace_end(ts); 2964d60e5e3SAdrian Hunter } else if ((flags & PERF_IP_FLAG_RETURN) && from_ip) { 297bd8e68acSAdrian Hunter thread_stack__pop(ts, to_ip); 29800447ccdSAdrian Hunter } 29900447ccdSAdrian Hunter 30000447ccdSAdrian Hunter return 0; 30100447ccdSAdrian Hunter } 30200447ccdSAdrian Hunter 30392a9e4f7SAdrian Hunter void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr) 30492a9e4f7SAdrian Hunter { 305bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 306bd8e68acSAdrian Hunter 307bd8e68acSAdrian Hunter if (!ts) 30892a9e4f7SAdrian Hunter return; 30992a9e4f7SAdrian Hunter 310bd8e68acSAdrian Hunter if (trace_nr != ts->trace_nr) { 311bd8e68acSAdrian Hunter if (ts->trace_nr) 312bd8e68acSAdrian Hunter __thread_stack__flush(thread, ts); 313bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 31492a9e4f7SAdrian Hunter } 31592a9e4f7SAdrian Hunter } 31692a9e4f7SAdrian Hunter 31700447ccdSAdrian Hunter void thread_stack__free(struct thread *thread) 31800447ccdSAdrian Hunter { 319bd8e68acSAdrian Hunter struct thread_stack *ts = thread->ts; 320bd8e68acSAdrian Hunter 321bd8e68acSAdrian Hunter if (ts) { 322bd8e68acSAdrian Hunter __thread_stack__flush(thread, ts); 323bd8e68acSAdrian Hunter zfree(&ts->stack); 32400447ccdSAdrian Hunter zfree(&thread->ts); 32500447ccdSAdrian Hunter } 32600447ccdSAdrian Hunter } 32700447ccdSAdrian Hunter 32824248306SAdrian Hunter static inline u64 callchain_context(u64 ip, u64 kernel_start) 32900447ccdSAdrian Hunter { 33024248306SAdrian Hunter return ip < kernel_start ? PERF_CONTEXT_USER : PERF_CONTEXT_KERNEL; 33124248306SAdrian Hunter } 33200447ccdSAdrian Hunter 33324248306SAdrian Hunter void thread_stack__sample(struct thread *thread, struct ip_callchain *chain, 33424248306SAdrian Hunter size_t sz, u64 ip, u64 kernel_start) 33524248306SAdrian Hunter { 336bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 33724248306SAdrian Hunter u64 context = callchain_context(ip, kernel_start); 33824248306SAdrian Hunter u64 last_context; 33924248306SAdrian Hunter size_t i, j; 34000447ccdSAdrian Hunter 34124248306SAdrian Hunter if (sz < 2) { 34224248306SAdrian Hunter chain->nr = 0; 34324248306SAdrian Hunter return; 34424248306SAdrian Hunter } 34500447ccdSAdrian Hunter 34624248306SAdrian Hunter chain->ips[0] = context; 34724248306SAdrian Hunter chain->ips[1] = ip; 34824248306SAdrian Hunter 349bd8e68acSAdrian Hunter if (!ts) { 35024248306SAdrian Hunter chain->nr = 2; 35124248306SAdrian Hunter return; 35224248306SAdrian Hunter } 35324248306SAdrian Hunter 35424248306SAdrian Hunter last_context = context; 35524248306SAdrian Hunter 356bd8e68acSAdrian Hunter for (i = 2, j = 1; i < sz && j <= ts->cnt; i++, j++) { 357bd8e68acSAdrian Hunter ip = ts->stack[ts->cnt - j].ret_addr; 35824248306SAdrian Hunter context = callchain_context(ip, kernel_start); 35924248306SAdrian Hunter if (context != last_context) { 36024248306SAdrian Hunter if (i >= sz - 1) 36124248306SAdrian Hunter break; 36224248306SAdrian Hunter chain->ips[i++] = context; 36324248306SAdrian Hunter last_context = context; 36424248306SAdrian Hunter } 36524248306SAdrian Hunter chain->ips[i] = ip; 36624248306SAdrian Hunter } 36724248306SAdrian Hunter 36824248306SAdrian Hunter chain->nr = i; 36900447ccdSAdrian Hunter } 37092a9e4f7SAdrian Hunter 37192a9e4f7SAdrian Hunter struct call_return_processor * 37292a9e4f7SAdrian Hunter call_return_processor__new(int (*process)(struct call_return *cr, void *data), 37392a9e4f7SAdrian Hunter void *data) 37492a9e4f7SAdrian Hunter { 37592a9e4f7SAdrian Hunter struct call_return_processor *crp; 37692a9e4f7SAdrian Hunter 37792a9e4f7SAdrian Hunter crp = zalloc(sizeof(struct call_return_processor)); 37892a9e4f7SAdrian Hunter if (!crp) 37992a9e4f7SAdrian Hunter return NULL; 38092a9e4f7SAdrian Hunter crp->cpr = call_path_root__new(); 38192a9e4f7SAdrian Hunter if (!crp->cpr) 38292a9e4f7SAdrian Hunter goto out_free; 38392a9e4f7SAdrian Hunter crp->process = process; 38492a9e4f7SAdrian Hunter crp->data = data; 38592a9e4f7SAdrian Hunter return crp; 38692a9e4f7SAdrian Hunter 38792a9e4f7SAdrian Hunter out_free: 38892a9e4f7SAdrian Hunter free(crp); 38992a9e4f7SAdrian Hunter return NULL; 39092a9e4f7SAdrian Hunter } 39192a9e4f7SAdrian Hunter 39292a9e4f7SAdrian Hunter void call_return_processor__free(struct call_return_processor *crp) 39392a9e4f7SAdrian Hunter { 39492a9e4f7SAdrian Hunter if (crp) { 39592a9e4f7SAdrian Hunter call_path_root__free(crp->cpr); 39692a9e4f7SAdrian Hunter free(crp); 39792a9e4f7SAdrian Hunter } 39892a9e4f7SAdrian Hunter } 39992a9e4f7SAdrian Hunter 40092a9e4f7SAdrian Hunter static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr, 40192a9e4f7SAdrian Hunter u64 timestamp, u64 ref, struct call_path *cp, 4022dcde4e1SAdrian Hunter bool no_call, bool trace_end) 40392a9e4f7SAdrian Hunter { 40492a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 40592a9e4f7SAdrian Hunter int err; 40692a9e4f7SAdrian Hunter 40792a9e4f7SAdrian Hunter if (ts->cnt == ts->sz) { 40892a9e4f7SAdrian Hunter err = thread_stack__grow(ts); 40992a9e4f7SAdrian Hunter if (err) 41092a9e4f7SAdrian Hunter return err; 41192a9e4f7SAdrian Hunter } 41292a9e4f7SAdrian Hunter 41392a9e4f7SAdrian Hunter tse = &ts->stack[ts->cnt++]; 41492a9e4f7SAdrian Hunter tse->ret_addr = ret_addr; 41592a9e4f7SAdrian Hunter tse->timestamp = timestamp; 41692a9e4f7SAdrian Hunter tse->ref = ref; 41792a9e4f7SAdrian Hunter tse->branch_count = ts->branch_count; 41892a9e4f7SAdrian Hunter tse->cp = cp; 41992a9e4f7SAdrian Hunter tse->no_call = no_call; 4202dcde4e1SAdrian Hunter tse->trace_end = trace_end; 42192a9e4f7SAdrian Hunter 42292a9e4f7SAdrian Hunter return 0; 42392a9e4f7SAdrian Hunter } 42492a9e4f7SAdrian Hunter 42592a9e4f7SAdrian Hunter static int thread_stack__pop_cp(struct thread *thread, struct thread_stack *ts, 42692a9e4f7SAdrian Hunter u64 ret_addr, u64 timestamp, u64 ref, 42792a9e4f7SAdrian Hunter struct symbol *sym) 42892a9e4f7SAdrian Hunter { 42992a9e4f7SAdrian Hunter int err; 43092a9e4f7SAdrian Hunter 43192a9e4f7SAdrian Hunter if (!ts->cnt) 43292a9e4f7SAdrian Hunter return 1; 43392a9e4f7SAdrian Hunter 43492a9e4f7SAdrian Hunter if (ts->cnt == 1) { 43592a9e4f7SAdrian Hunter struct thread_stack_entry *tse = &ts->stack[0]; 43692a9e4f7SAdrian Hunter 43792a9e4f7SAdrian Hunter if (tse->cp->sym == sym) 43892a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 43992a9e4f7SAdrian Hunter timestamp, ref, false); 44092a9e4f7SAdrian Hunter } 44192a9e4f7SAdrian Hunter 44292a9e4f7SAdrian Hunter if (ts->stack[ts->cnt - 1].ret_addr == ret_addr) { 44392a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 44492a9e4f7SAdrian Hunter timestamp, ref, false); 44592a9e4f7SAdrian Hunter } else { 44692a9e4f7SAdrian Hunter size_t i = ts->cnt - 1; 44792a9e4f7SAdrian Hunter 44892a9e4f7SAdrian Hunter while (i--) { 44992a9e4f7SAdrian Hunter if (ts->stack[i].ret_addr != ret_addr) 45092a9e4f7SAdrian Hunter continue; 45192a9e4f7SAdrian Hunter i += 1; 45292a9e4f7SAdrian Hunter while (ts->cnt > i) { 45392a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, 45492a9e4f7SAdrian Hunter --ts->cnt, 45592a9e4f7SAdrian Hunter timestamp, ref, 45692a9e4f7SAdrian Hunter true); 45792a9e4f7SAdrian Hunter if (err) 45892a9e4f7SAdrian Hunter return err; 45992a9e4f7SAdrian Hunter } 46092a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 46192a9e4f7SAdrian Hunter timestamp, ref, false); 46292a9e4f7SAdrian Hunter } 46392a9e4f7SAdrian Hunter } 46492a9e4f7SAdrian Hunter 46592a9e4f7SAdrian Hunter return 1; 46692a9e4f7SAdrian Hunter } 46792a9e4f7SAdrian Hunter 468e0b89511SAdrian Hunter static int thread_stack__bottom(struct thread_stack *ts, 46992a9e4f7SAdrian Hunter struct perf_sample *sample, 47092a9e4f7SAdrian Hunter struct addr_location *from_al, 47192a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref) 47292a9e4f7SAdrian Hunter { 47392a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 47492a9e4f7SAdrian Hunter struct call_path *cp; 47592a9e4f7SAdrian Hunter struct symbol *sym; 47692a9e4f7SAdrian Hunter u64 ip; 47792a9e4f7SAdrian Hunter 47892a9e4f7SAdrian Hunter if (sample->ip) { 47992a9e4f7SAdrian Hunter ip = sample->ip; 48092a9e4f7SAdrian Hunter sym = from_al->sym; 48192a9e4f7SAdrian Hunter } else if (sample->addr) { 48292a9e4f7SAdrian Hunter ip = sample->addr; 48392a9e4f7SAdrian Hunter sym = to_al->sym; 48492a9e4f7SAdrian Hunter } else { 48592a9e4f7SAdrian Hunter return 0; 48692a9e4f7SAdrian Hunter } 48792a9e4f7SAdrian Hunter 48892a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, &cpr->call_path, sym, ip, 48992a9e4f7SAdrian Hunter ts->kernel_start); 49092a9e4f7SAdrian Hunter if (!cp) 49192a9e4f7SAdrian Hunter return -ENOMEM; 49292a9e4f7SAdrian Hunter 493e0b89511SAdrian Hunter return thread_stack__push_cp(ts, ip, sample->time, ref, cp, 4942dcde4e1SAdrian Hunter true, false); 49592a9e4f7SAdrian Hunter } 49692a9e4f7SAdrian Hunter 49792a9e4f7SAdrian Hunter static int thread_stack__no_call_return(struct thread *thread, 49892a9e4f7SAdrian Hunter struct thread_stack *ts, 49992a9e4f7SAdrian Hunter struct perf_sample *sample, 50092a9e4f7SAdrian Hunter struct addr_location *from_al, 50192a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref) 50292a9e4f7SAdrian Hunter { 50392a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 50492a9e4f7SAdrian Hunter struct call_path *cp, *parent; 50592a9e4f7SAdrian Hunter u64 ks = ts->kernel_start; 50692a9e4f7SAdrian Hunter int err; 50792a9e4f7SAdrian Hunter 50892a9e4f7SAdrian Hunter if (sample->ip >= ks && sample->addr < ks) { 50992a9e4f7SAdrian Hunter /* Return to userspace, so pop all kernel addresses */ 51092a9e4f7SAdrian Hunter while (thread_stack__in_kernel(ts)) { 51192a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 51292a9e4f7SAdrian Hunter sample->time, ref, 51392a9e4f7SAdrian Hunter true); 51492a9e4f7SAdrian Hunter if (err) 51592a9e4f7SAdrian Hunter return err; 51692a9e4f7SAdrian Hunter } 51792a9e4f7SAdrian Hunter 51892a9e4f7SAdrian Hunter /* If the stack is empty, push the userspace address */ 51992a9e4f7SAdrian Hunter if (!ts->cnt) { 52092a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, &cpr->call_path, 52192a9e4f7SAdrian Hunter to_al->sym, sample->addr, 52292a9e4f7SAdrian Hunter ts->kernel_start); 52392a9e4f7SAdrian Hunter if (!cp) 52492a9e4f7SAdrian Hunter return -ENOMEM; 52592a9e4f7SAdrian Hunter return thread_stack__push_cp(ts, 0, sample->time, ref, 5262dcde4e1SAdrian Hunter cp, true, false); 52792a9e4f7SAdrian Hunter } 52892a9e4f7SAdrian Hunter } else if (thread_stack__in_kernel(ts) && sample->ip < ks) { 52992a9e4f7SAdrian Hunter /* Return to userspace, so pop all kernel addresses */ 53092a9e4f7SAdrian Hunter while (thread_stack__in_kernel(ts)) { 53192a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 53292a9e4f7SAdrian Hunter sample->time, ref, 53392a9e4f7SAdrian Hunter true); 53492a9e4f7SAdrian Hunter if (err) 53592a9e4f7SAdrian Hunter return err; 53692a9e4f7SAdrian Hunter } 53792a9e4f7SAdrian Hunter } 53892a9e4f7SAdrian Hunter 53992a9e4f7SAdrian Hunter if (ts->cnt) 54092a9e4f7SAdrian Hunter parent = ts->stack[ts->cnt - 1].cp; 54192a9e4f7SAdrian Hunter else 54292a9e4f7SAdrian Hunter parent = &cpr->call_path; 54392a9e4f7SAdrian Hunter 54492a9e4f7SAdrian Hunter /* This 'return' had no 'call', so push and pop top of stack */ 54592a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, parent, from_al->sym, sample->ip, 54692a9e4f7SAdrian Hunter ts->kernel_start); 54792a9e4f7SAdrian Hunter if (!cp) 54892a9e4f7SAdrian Hunter return -ENOMEM; 54992a9e4f7SAdrian Hunter 55092a9e4f7SAdrian Hunter err = thread_stack__push_cp(ts, sample->addr, sample->time, ref, cp, 5512dcde4e1SAdrian Hunter true, false); 55292a9e4f7SAdrian Hunter if (err) 55392a9e4f7SAdrian Hunter return err; 55492a9e4f7SAdrian Hunter 55592a9e4f7SAdrian Hunter return thread_stack__pop_cp(thread, ts, sample->addr, sample->time, ref, 55692a9e4f7SAdrian Hunter to_al->sym); 55792a9e4f7SAdrian Hunter } 55892a9e4f7SAdrian Hunter 55992a9e4f7SAdrian Hunter static int thread_stack__trace_begin(struct thread *thread, 56092a9e4f7SAdrian Hunter struct thread_stack *ts, u64 timestamp, 56192a9e4f7SAdrian Hunter u64 ref) 56292a9e4f7SAdrian Hunter { 56392a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 56492a9e4f7SAdrian Hunter int err; 56592a9e4f7SAdrian Hunter 56692a9e4f7SAdrian Hunter if (!ts->cnt) 56792a9e4f7SAdrian Hunter return 0; 56892a9e4f7SAdrian Hunter 56992a9e4f7SAdrian Hunter /* Pop trace end */ 57092a9e4f7SAdrian Hunter tse = &ts->stack[ts->cnt - 1]; 5712dcde4e1SAdrian Hunter if (tse->trace_end) { 57292a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 57392a9e4f7SAdrian Hunter timestamp, ref, false); 57492a9e4f7SAdrian Hunter if (err) 57592a9e4f7SAdrian Hunter return err; 57692a9e4f7SAdrian Hunter } 57792a9e4f7SAdrian Hunter 57892a9e4f7SAdrian Hunter return 0; 57992a9e4f7SAdrian Hunter } 58092a9e4f7SAdrian Hunter 58192a9e4f7SAdrian Hunter static int thread_stack__trace_end(struct thread_stack *ts, 58292a9e4f7SAdrian Hunter struct perf_sample *sample, u64 ref) 58392a9e4f7SAdrian Hunter { 58492a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 58592a9e4f7SAdrian Hunter struct call_path *cp; 58692a9e4f7SAdrian Hunter u64 ret_addr; 58792a9e4f7SAdrian Hunter 58892a9e4f7SAdrian Hunter /* No point having 'trace end' on the bottom of the stack */ 58992a9e4f7SAdrian Hunter if (!ts->cnt || (ts->cnt == 1 && ts->stack[0].ref == ref)) 59092a9e4f7SAdrian Hunter return 0; 59192a9e4f7SAdrian Hunter 59292a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, NULL, 0, 59392a9e4f7SAdrian Hunter ts->kernel_start); 59492a9e4f7SAdrian Hunter if (!cp) 59592a9e4f7SAdrian Hunter return -ENOMEM; 59692a9e4f7SAdrian Hunter 59792a9e4f7SAdrian Hunter ret_addr = sample->ip + sample->insn_len; 59892a9e4f7SAdrian Hunter 59992a9e4f7SAdrian Hunter return thread_stack__push_cp(ts, ret_addr, sample->time, ref, cp, 6002dcde4e1SAdrian Hunter false, true); 60192a9e4f7SAdrian Hunter } 60292a9e4f7SAdrian Hunter 60392a9e4f7SAdrian Hunter int thread_stack__process(struct thread *thread, struct comm *comm, 60492a9e4f7SAdrian Hunter struct perf_sample *sample, 60592a9e4f7SAdrian Hunter struct addr_location *from_al, 60692a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref, 60792a9e4f7SAdrian Hunter struct call_return_processor *crp) 60892a9e4f7SAdrian Hunter { 609bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 61092a9e4f7SAdrian Hunter int err = 0; 61192a9e4f7SAdrian Hunter 61203b32cb2SAdrian Hunter if (ts && !ts->crp) { 61392a9e4f7SAdrian Hunter /* Supersede thread_stack__event() */ 61492a9e4f7SAdrian Hunter thread_stack__free(thread); 61503b32cb2SAdrian Hunter ts = NULL; 61692a9e4f7SAdrian Hunter } 61703b32cb2SAdrian Hunter 61803b32cb2SAdrian Hunter if (!ts) { 619bd8e68acSAdrian Hunter ts = thread_stack__new(thread, crp); 620bd8e68acSAdrian Hunter if (!ts) 62192a9e4f7SAdrian Hunter return -ENOMEM; 62292a9e4f7SAdrian Hunter ts->comm = comm; 62392a9e4f7SAdrian Hunter } 62492a9e4f7SAdrian Hunter 62592a9e4f7SAdrian Hunter /* Flush stack on exec */ 62692a9e4f7SAdrian Hunter if (ts->comm != comm && thread->pid_ == thread->tid) { 627a5499b37SAdrian Hunter err = __thread_stack__flush(thread, ts); 62892a9e4f7SAdrian Hunter if (err) 62992a9e4f7SAdrian Hunter return err; 63092a9e4f7SAdrian Hunter ts->comm = comm; 63192a9e4f7SAdrian Hunter } 63292a9e4f7SAdrian Hunter 63392a9e4f7SAdrian Hunter /* If the stack is empty, put the current symbol on the stack */ 63492a9e4f7SAdrian Hunter if (!ts->cnt) { 635e0b89511SAdrian Hunter err = thread_stack__bottom(ts, sample, from_al, to_al, ref); 63692a9e4f7SAdrian Hunter if (err) 63792a9e4f7SAdrian Hunter return err; 63892a9e4f7SAdrian Hunter } 63992a9e4f7SAdrian Hunter 64092a9e4f7SAdrian Hunter ts->branch_count += 1; 64192a9e4f7SAdrian Hunter ts->last_time = sample->time; 64292a9e4f7SAdrian Hunter 64392a9e4f7SAdrian Hunter if (sample->flags & PERF_IP_FLAG_CALL) { 6442dcde4e1SAdrian Hunter bool trace_end = sample->flags & PERF_IP_FLAG_TRACE_END; 64592a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 64692a9e4f7SAdrian Hunter struct call_path *cp; 64792a9e4f7SAdrian Hunter u64 ret_addr; 64892a9e4f7SAdrian Hunter 64992a9e4f7SAdrian Hunter if (!sample->ip || !sample->addr) 65092a9e4f7SAdrian Hunter return 0; 65192a9e4f7SAdrian Hunter 65292a9e4f7SAdrian Hunter ret_addr = sample->ip + sample->insn_len; 65392a9e4f7SAdrian Hunter if (ret_addr == sample->addr) 65492a9e4f7SAdrian Hunter return 0; /* Zero-length calls are excluded */ 65592a9e4f7SAdrian Hunter 65692a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, 65792a9e4f7SAdrian Hunter to_al->sym, sample->addr, 65892a9e4f7SAdrian Hunter ts->kernel_start); 65992a9e4f7SAdrian Hunter if (!cp) 66092a9e4f7SAdrian Hunter return -ENOMEM; 66192a9e4f7SAdrian Hunter err = thread_stack__push_cp(ts, ret_addr, sample->time, ref, 6622dcde4e1SAdrian Hunter cp, false, trace_end); 66392a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_RETURN) { 66492a9e4f7SAdrian Hunter if (!sample->ip || !sample->addr) 66592a9e4f7SAdrian Hunter return 0; 66692a9e4f7SAdrian Hunter 66792a9e4f7SAdrian Hunter err = thread_stack__pop_cp(thread, ts, sample->addr, 66892a9e4f7SAdrian Hunter sample->time, ref, from_al->sym); 66992a9e4f7SAdrian Hunter if (err) { 67092a9e4f7SAdrian Hunter if (err < 0) 67192a9e4f7SAdrian Hunter return err; 67292a9e4f7SAdrian Hunter err = thread_stack__no_call_return(thread, ts, sample, 67392a9e4f7SAdrian Hunter from_al, to_al, ref); 67492a9e4f7SAdrian Hunter } 67592a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_TRACE_BEGIN) { 67692a9e4f7SAdrian Hunter err = thread_stack__trace_begin(thread, ts, sample->time, ref); 67792a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_TRACE_END) { 67892a9e4f7SAdrian Hunter err = thread_stack__trace_end(ts, sample, ref); 67992a9e4f7SAdrian Hunter } 68092a9e4f7SAdrian Hunter 68192a9e4f7SAdrian Hunter return err; 68292a9e4f7SAdrian Hunter } 683e216708dSAdrian Hunter 684e216708dSAdrian Hunter size_t thread_stack__depth(struct thread *thread) 685e216708dSAdrian Hunter { 686bd8e68acSAdrian Hunter struct thread_stack *ts = thread__stack(thread); 687bd8e68acSAdrian Hunter 688bd8e68acSAdrian Hunter if (!ts) 689e216708dSAdrian Hunter return 0; 690bd8e68acSAdrian Hunter return ts->cnt; 691e216708dSAdrian Hunter } 692