• Jiri Olsa's avatar
    perf/x86: Add MSR probe interface · 98253a54
    Jiri Olsa authored
    Adding perf_msr_probe function to provide interface for
    checking up on MSR register and set the related attribute
    group visibility.
    
    User defines following struct for each MSR register:
    
      struct perf_msr {
           u64                       msr;
           struct attribute_group   *grp;
           bool                    (*test)(int idx, void *data);
           bool                      no_check;
      };
    
    Where:
      msr      - is the MSR address
      attrs    - is attribute groups array to add if the check passed
      test     - is test function pointer
      no_check - is bool that bypass the check and adds the
                  attribute without any test
    
    The array of struct perf_msr is passed into:
    
      perf_msr_probe(struct perf_msr *msr, int cnt, bool zero, void *data)
    
    Together with:
      cnt  - which is the number of struct msr array elements
      data - which is user pointer passed to the test function
      zero - allow counters that returns zero on rdmsr
    
    The perf_msr_probe will executed test code, read the MSR and
    check the value is != 0. If all these tests pass, related
    attribute group is kept visible.
    
    Also adding PMU_EVENT_GROUP macro helper to define attribute
    group for single attribute. It will be used in following patches.
    Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Kan <kan.liang@linux.intel.com>
    Cc: Liang
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Vince Weaver <vincent.weaver@maine.edu>
    Link: https://lkml.kernel.org/r/20190616140358.27799-2-jolsa@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    98253a54
Makefile 174 Bytes