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Pass d+e option and log size via intel_pt_log_enable(). Allocate a buffer
for log messages and provide intel_pt_log_dump_buf() to dump and reset the
buffer upon decoder errors.
Example:
$ sudo perf record -e intel_pt// sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.094 MB perf.data ]
$ sudo perf config itrace.debug-log-buffer-size=300
$ sudo perf script --itrace=ed+e+o | head -20
Dumping debug log buffer (first line may be sliced)
Other
ffffffff96ca22f6: 48 89 e5 Other
ffffffff96ca22f9: 65 48 8b 05 ff e0 38 69 Other
ffffffff96ca2301: 48 3d c0 a5 c1 98 Other
ffffffff96ca2307: 74 08 Jcc +8
ffffffff96ca2311: 5d Other
ffffffff96ca2312: c3 Ret
ERROR: Bad RET compression (TNT=N) at 0xffffffff96ca2312
End of debug log buffer dump
instruction trace error type 1 time 15913.537143482 cpu 5 pid 36292 tid 36292 ip 0xffffffff96ca2312 code 6: Trace doesn't match instruction
Dumping debug log buffer (first line may be sliced)
Other
ffffffff96ce7fe9: f6 47 2e 20 Other
ffffffff96ce7fed: 74 11 Jcc +17
ffffffff96ce7fef: 48 8b 87 28 0a 00 00 Other
ffffffff96ce7ff6: 5d Other
ffffffff96ce7ff7: 48 8b 40 18 Other
ffffffff96ce7ffb: c3 Ret
ERROR: Bad RET compression (TNT=N) at 0xffffffff96ce7ffb
Warning:
8 instruction trace errors
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220905073424.3971-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* intel_pt_log.h: Intel Processor Trace support
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* Copyright (c) 2013-2014, Intel Corporation.
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*/
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#ifndef INCLUDE__INTEL_PT_LOG_H__
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#define INCLUDE__INTEL_PT_LOG_H__
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#include <linux/compiler.h>
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#include <stdint.h>
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#include <inttypes.h>
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struct intel_pt_pkt;
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void *intel_pt_log_fp(void);
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void intel_pt_log_enable(bool dump_log_on_error, unsigned int log_on_error_size);
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void intel_pt_log_disable(void);
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void intel_pt_log_set_name(const char *name);
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void intel_pt_log_dump_buf(void);
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void __intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
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uint64_t pos, const unsigned char *buf);
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struct intel_pt_insn;
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void __intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip);
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void __intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn,
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uint64_t ip);
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void __intel_pt_log(const char *fmt, ...) __printf(1, 2);
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#define intel_pt_log(fmt, ...) \
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do { \
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if (intel_pt_enable_logging) \
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__intel_pt_log(fmt, ##__VA_ARGS__); \
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} while (0)
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#define intel_pt_log_packet(arg, ...) \
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do { \
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if (intel_pt_enable_logging) \
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__intel_pt_log_packet(arg, ##__VA_ARGS__); \
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} while (0)
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#define intel_pt_log_insn(arg, ...) \
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do { \
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if (intel_pt_enable_logging) \
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__intel_pt_log_insn(arg, ##__VA_ARGS__); \
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} while (0)
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#define intel_pt_log_insn_no_data(arg, ...) \
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do { \
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if (intel_pt_enable_logging) \
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__intel_pt_log_insn_no_data(arg, ##__VA_ARGS__); \
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} while (0)
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#define x64_fmt "0x%" PRIx64
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extern bool intel_pt_enable_logging;
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static inline void intel_pt_log_at(const char *msg, uint64_t u)
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{
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intel_pt_log("%s at " x64_fmt "\n", msg, u);
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}
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static inline void intel_pt_log_to(const char *msg, uint64_t u)
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{
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intel_pt_log("%s to " x64_fmt "\n", msg, u);
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}
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#define intel_pt_log_var(var, fmt) intel_pt_log("%s: " #var " " fmt "\n", __func__, var)
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#define intel_pt_log_x32(var) intel_pt_log_var(var, "%#x")
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#define intel_pt_log_x64(var) intel_pt_log_var(var, "%#" PRIx64)
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#endif
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