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142 lines
3.2 KiB
142 lines
3.2 KiB
/* |
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* kdb helper for dumping the ftrace buffer |
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* |
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* Copyright (C) 2010 Jason Wessel <[email protected]> |
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* |
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* ftrace_dump_buf based on ftrace_dump: |
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* Copyright (C) 2007-2008 Steven Rostedt <[email protected]> |
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* Copyright (C) 2008 Ingo Molnar <[email protected]> |
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* |
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*/ |
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#include <linux/init.h> |
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#include <linux/kgdb.h> |
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#include <linux/kdb.h> |
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#include <linux/ftrace.h> |
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#include "trace.h" |
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#include "trace_output.h" |
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static void ftrace_dump_buf(int skip_lines, long cpu_file) |
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{ |
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/* use static because iter can be a bit big for the stack */ |
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static struct trace_iterator iter; |
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static struct ring_buffer_iter *buffer_iter[CONFIG_NR_CPUS]; |
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struct trace_array *tr; |
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unsigned int old_userobj; |
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int cnt = 0, cpu; |
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trace_init_global_iter(&iter); |
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iter.buffer_iter = buffer_iter; |
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tr = iter.tr; |
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for_each_tracing_cpu(cpu) { |
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atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled); |
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} |
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old_userobj = tr->trace_flags; |
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/* don't look at user memory in panic mode */ |
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tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ; |
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kdb_printf("Dumping ftrace buffer:\n"); |
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/* reset all but tr, trace, and overruns */ |
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memset(&iter.seq, 0, |
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sizeof(struct trace_iterator) - |
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offsetof(struct trace_iterator, seq)); |
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iter.iter_flags |= TRACE_FILE_LAT_FMT; |
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iter.pos = -1; |
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if (cpu_file == RING_BUFFER_ALL_CPUS) { |
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for_each_tracing_cpu(cpu) { |
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iter.buffer_iter[cpu] = |
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ring_buffer_read_prepare(iter.trace_buffer->buffer, cpu); |
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ring_buffer_read_start(iter.buffer_iter[cpu]); |
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tracing_iter_reset(&iter, cpu); |
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} |
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} else { |
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iter.cpu_file = cpu_file; |
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iter.buffer_iter[cpu_file] = |
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ring_buffer_read_prepare(iter.trace_buffer->buffer, cpu_file); |
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ring_buffer_read_start(iter.buffer_iter[cpu_file]); |
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tracing_iter_reset(&iter, cpu_file); |
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} |
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while (trace_find_next_entry_inc(&iter)) { |
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if (!cnt) |
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kdb_printf("---------------------------------\n"); |
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cnt++; |
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if (!skip_lines) { |
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print_trace_line(&iter); |
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trace_printk_seq(&iter.seq); |
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} else { |
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skip_lines--; |
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} |
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if (KDB_FLAG(CMD_INTERRUPT)) |
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goto out; |
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} |
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if (!cnt) |
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kdb_printf(" (ftrace buffer empty)\n"); |
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else |
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kdb_printf("---------------------------------\n"); |
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out: |
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tr->trace_flags = old_userobj; |
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for_each_tracing_cpu(cpu) { |
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atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled); |
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} |
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for_each_tracing_cpu(cpu) { |
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if (iter.buffer_iter[cpu]) { |
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ring_buffer_read_finish(iter.buffer_iter[cpu]); |
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iter.buffer_iter[cpu] = NULL; |
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} |
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} |
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} |
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/* |
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* kdb_ftdump - Dump the ftrace log buffer |
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*/ |
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static int kdb_ftdump(int argc, const char **argv) |
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{ |
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int skip_lines = 0; |
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long cpu_file; |
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char *cp; |
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if (argc > 2) |
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return KDB_ARGCOUNT; |
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if (argc) { |
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skip_lines = simple_strtol(argv[1], &cp, 0); |
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if (*cp) |
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skip_lines = 0; |
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} |
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if (argc == 2) { |
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cpu_file = simple_strtol(argv[2], &cp, 0); |
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if (*cp || cpu_file >= NR_CPUS || cpu_file < 0 || |
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!cpu_online(cpu_file)) |
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return KDB_BADINT; |
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} else { |
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cpu_file = RING_BUFFER_ALL_CPUS; |
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} |
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kdb_trap_printk++; |
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ftrace_dump_buf(skip_lines, cpu_file); |
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kdb_trap_printk--; |
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return 0; |
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} |
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static __init int kdb_ftrace_register(void) |
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{ |
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kdb_register_flags("ftdump", kdb_ftdump, "[skip_#lines] [cpu]", |
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"Dump ftrace log", 0, KDB_ENABLE_ALWAYS_SAFE); |
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return 0; |
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} |
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late_initcall(kdb_ftrace_register);
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