^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * kdb helper for dumping the ftrace buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2010 Jason Wessel <jason.wessel@windriver.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * ftrace_dump_buf based on ftrace_dump:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kgdb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kdb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "trace.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "trace_output.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static struct trace_iterator iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static struct ring_buffer_iter *buffer_iter[CONFIG_NR_CPUS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static void ftrace_dump_buf(int skip_entries, long cpu_file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct trace_array *tr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned int old_userobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int cnt = 0, cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) tr = iter.tr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) old_userobj = tr->trace_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /* don't look at user memory in panic mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) kdb_printf("Dumping ftrace buffer:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) if (skip_entries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) kdb_printf("(skipping %d entries)\n", skip_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) trace_iterator_reset(&iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) iter.iter_flags |= TRACE_FILE_LAT_FMT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (cpu_file == RING_BUFFER_ALL_CPUS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) for_each_tracing_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) iter.buffer_iter[cpu] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ring_buffer_read_prepare(iter.array_buffer->buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) cpu, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) ring_buffer_read_start(iter.buffer_iter[cpu]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) tracing_iter_reset(&iter, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) iter.cpu_file = cpu_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) iter.buffer_iter[cpu_file] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) ring_buffer_read_prepare(iter.array_buffer->buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) cpu_file, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) ring_buffer_read_start(iter.buffer_iter[cpu_file]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) tracing_iter_reset(&iter, cpu_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) while (trace_find_next_entry_inc(&iter)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (!cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) kdb_printf("---------------------------------\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (!skip_entries) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) print_trace_line(&iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) trace_printk_seq(&iter.seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) skip_entries--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (KDB_FLAG(CMD_INTERRUPT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (!cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) kdb_printf(" (ftrace buffer empty)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) kdb_printf("---------------------------------\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) tr->trace_flags = old_userobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) for_each_tracing_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (iter.buffer_iter[cpu]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) ring_buffer_read_finish(iter.buffer_iter[cpu]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) iter.buffer_iter[cpu] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * kdb_ftdump - Dump the ftrace log buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static int kdb_ftdump(int argc, const char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) int skip_entries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) long cpu_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) char *cp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) int cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (argc > 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return KDB_ARGCOUNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (argc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) skip_entries = simple_strtol(argv[1], &cp, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (*cp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) skip_entries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (argc == 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) cpu_file = simple_strtol(argv[2], &cp, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (*cp || cpu_file >= NR_CPUS || cpu_file < 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) !cpu_online(cpu_file))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return KDB_BADINT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) cpu_file = RING_BUFFER_ALL_CPUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) kdb_trap_printk++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) trace_init_global_iter(&iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) iter.buffer_iter = buffer_iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) for_each_tracing_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) atomic_inc(&per_cpu_ptr(iter.array_buffer->data, cpu)->disabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /* A negative skip_entries means skip all but the last entries */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (skip_entries < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (cpu_file == RING_BUFFER_ALL_CPUS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) cnt = trace_total_entries(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) cnt = trace_total_entries_cpu(NULL, cpu_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) skip_entries = max(cnt + skip_entries, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ftrace_dump_buf(skip_entries, cpu_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) for_each_tracing_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) atomic_dec(&per_cpu_ptr(iter.array_buffer->data, cpu)->disabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) kdb_trap_printk--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static __init int kdb_ftrace_register(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) kdb_register_flags("ftdump", kdb_ftdump, "[skip_#entries] [cpu]",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) "Dump ftrace log; -skip dumps last #entries", 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) KDB_ENABLE_ALWAYS_SAFE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) late_initcall(kdb_ftrace_register);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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