perf cs-etm: Synthesize callchains for instruction samples

CS ETM already records branches into the thread stack, but instruction
samples do not carry synthesized callchains. It misses to support the
callchain and no output with the itrace option 'g'.

Allocate a callchain buffer per queue and use thread_stack__sample()
when synthesizing instruction samples.

Advertise PERF_SAMPLE_CALLCHAIN on the synthetic instruction event.
Allocate one extra callchain entry than requested, as the first entry
is reserved for storing context information.

cs_etm__context() is introduced for handling context packet and update
the thread info and start kernel address for frontend decoding.

After:

  perf script --itrace=g16l64i1i

  callchain_test    6543 [002]          1 instructions:
        ffff800080010c14 vectors+0x414 ([kernel.kallsyms])
            aaaad6b60784 do_svc+0x1c (/home/kernel/leoy/test_cs_callchain/callchain_test)
            aaaad6b60798 print+0xc (/home/kernel/leoy/test_cs_callchain/callchain_test)
            aaaad6b607b0 foo+0xc (/home/kernel/leoy/test_cs_callchain/callchain_test)
            aaaad6b607c8 main+0xc (/home/kernel/leoy/test_cs_callchain/callchain_test)
            ffff9325225c __libc_start_call_main+0x7c (/usr/lib/aarch64-linux-gnu/libc.so.6)
            ffff9325233c call_init+0x9c (inlined)
            ffff9325233c __libc_start_main_impl+0x9c (inlined)
            aaaad6b60670 _start+0x30 (/home/kernel/leoy/test_cs_callchain/callchain_test)
        ffff800080012290 ret_to_user+0x120 ([kernel.kallsyms])

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

0 files changed, 0 insertions, 0 deletions