perf bpf filter: Implement event sample filtering

The BPF program will be attached to a perf_event and be triggered when
it overflows.  It'd iterate the filters map and compare the sample
value according to the expression.  If any of them fails, the sample
would be dropped.

Also it needs to have the corresponding sample data for the expression
so it compares data->sample_flags with the given value.  To access the
sample data, it uses the bpf_cast_to_kern_ctx() kfunc which was added
in v6.2 kernel.

Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Hao Luo <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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