arch/powerpc/include/asm/perf_event.h

   1 /*
   2  * Performance event support - hardware-specific disambiguation
   3  *
   4  * For now this is a compile-time decision, but eventually it should be
   5  * runtime.  This would allow multiplatform perf event support for e300 (fsl
   6  * embedded perf counters) plus server/classic, and would accommodate
   7  * devices other than the core which provide their own performance counters.
   8  *
   9  * Copyright 2010 Freescale Semiconductor, Inc.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version
  14  * 2 of the License, or (at your option) any later version.
  15  */
  16
  17 #ifdef CONFIG_PPC_PERF_CTRS
  18 #include <asm/perf_event_server.h>
  19 #endif
  20
  21 #ifdef CONFIG_FSL_EMB_PERF_EVENT
  22 #include <asm/perf_event_fsl_emb.h>
  23 #endif
  24
  25 #ifdef CONFIG_PERF_EVENTS
  26 #include <asm/ptrace.h>
  27 #include <asm/reg.h>
  28
  29 /*
  30  * Overload regs->result to specify whether we should use the MSR (result
  31  * is zero) or the SIAR (result is non zero).
  32  */
  33 #define perf_arch_fetch_caller_regs(regs, __ip)                 \
  34         do {                                                    \
  35                 (regs)->result = 0;                             \
  36                 (regs)->nip = __ip;                             \
  37                 (regs)->gpr[1] = *(unsigned long *)__get_SP();  \
  38                 asm volatile("mfmsr %0" : "=r" ((regs)->msr));  \
  39         } while (0)
  40 #endif