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  • Kan Liang's avatar
    perf regs x86: Fix arch__intr_reg_mask() for the hybrid platform · 01b28e4a
    Kan Liang authored
    The X86 specific arch__intr_reg_mask() is to check whether the kernel
    and hardware can collect XMM registers. But it doesn't work on some
    hybrid platform.
    
    Without the patch on ADL-N:
    
      $ perf record -I?
      available registers: AX BX CX DX SI DI BP SP IP FLAGS CS SS R8 R9 R10
      R11 R12 R13 R14 R15
    
    The config of the test event doesn't contain the PMU information. The
    kernel may fail to initialize it on the correct hybrid PMU and return
    the wrong non-supported information.
    
    Add the PMU information into the config for the hybrid platform. The
    same register set is supported among different hybrid PMUs. Checking
    the first available one is good enough.
    
    With the patch on ADL-N:
    
      $ perf record -I?
      available registers: AX BX CX DX SI DI BP SP IP FLAGS CS SS R8 R9 R10
      R11 R12 R13 R14 R15 XMM0 XMM1 XMM2 XMM3 XMM4 XMM5 XMM6 XMM7 XMM8 XMM9
      XMM10 XMM11 XMM12 XMM13 XMM14 XMM15
    
    Fixes: 6466ec14
    
     ("perf regs x86: Add X86 specific arch__intr_reg_mask()")
    Reported-by: default avatarAmmy Yi <ammy.yi@intel.com>
    Signed-off-by: default avatarKan Liang <kan.liang@linux.intel.com>
    Acked-by: default avatarIan Rogers <irogers@google.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Kan Liang <kan.liang@linux.intel.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
    Link: https://lore.kernel.org/r/20220518145125.1494156-1-kan.liang@linux.intel.com
    
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    01b28e4a
perf_regs.c 8.07 KB