linux/arch/powerpc/include/asm/perf_event.h
Anton Blanchard 75382aa72f powerpc/perf: Move code to select SIAR or pt_regs into perf_read_regs
The logic to choose whether to use the SIAR or get the information
out of pt_regs is going to get more complicated, so do it once in
perf_read_regs.

We overload regs->result which is gross but we are already doing it
with regs->dsisr.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2012-07-10 19:18:41 +10:00

41 lines
1.2 KiB
C

/*
* Performance event support - hardware-specific disambiguation
*
* For now this is a compile-time decision, but eventually it should be
* runtime. This would allow multiplatform perf event support for e300 (fsl
* embedded perf counters) plus server/classic, and would accommodate
* devices other than the core which provide their own performance counters.
*
* Copyright 2010 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifdef CONFIG_PPC_PERF_CTRS
#include <asm/perf_event_server.h>
#endif
#ifdef CONFIG_FSL_EMB_PERF_EVENT
#include <asm/perf_event_fsl_emb.h>
#endif
#ifdef CONFIG_PERF_EVENTS
#include <asm/ptrace.h>
#include <asm/reg.h>
/*
* Overload regs->result to specify whether we should use the MSR (result
* is zero) or the SIAR (result is non zero).
*/
#define perf_arch_fetch_caller_regs(regs, __ip) \
do { \
(regs)->result = 0; \
(regs)->nip = __ip; \
(regs)->gpr[1] = *(unsigned long *)__get_SP(); \
asm volatile("mfmsr %0" : "=r" ((regs)->msr)); \
} while (0)
#endif