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powerpc/perf: Move code to select SIAR or pt_regs into perf_read_regs

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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>
This commit is contained in:
Anton Blanchard 2012-06-26 01:01:36 +00:00 committed by Benjamin Herrenschmidt
parent 68b30bb9f0
commit 75382aa72f
2 changed files with 30 additions and 22 deletions
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5
arch/powerpc/include/asm/perf_event.h
View File

@ -26,8 +26,13 @@
#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)); \

47
arch/powerpc/perf/core-book3s.c
View File

@ -73,7 +73,10 @@ static inline u32 perf_get_misc_flags(struct pt_regs *regs)
{
return 0;
}
static inline void perf_read_regs(struct pt_regs *regs) { }
static inline void perf_read_regs(struct pt_regs *regs)
{
regs->result = 0;
}
static inline int perf_intr_is_nmi(struct pt_regs *regs)
{
return 0;
@ -148,17 +151,9 @@ static inline u32 perf_flags_from_msr(struct pt_regs *regs)
static inline u32 perf_get_misc_flags(struct pt_regs *regs)
{
unsigned long mmcra = regs->dsisr;
unsigned long use_siar = regs->result;
/* Not a PMU interrupt: Make up flags from regs->msr */
if (TRAP(regs) != 0xf00)
return perf_flags_from_msr(regs);
/*
* If we don't support continuous sampling and this
* is not a marked event, same deal
*/
if ((ppmu->flags & PPMU_NO_CONT_SAMPLING) &&
!(mmcra & MMCRA_SAMPLE_ENABLE))
if (!use_siar)
return perf_flags_from_msr(regs);
/*
@ -185,10 +180,24 @@ static inline u32 perf_get_misc_flags(struct pt_regs *regs)
/*
* Overload regs->dsisr to store MMCRA so we only need to read it once
* on each interrupt.
* Overload regs->result to specify whether we should use the MSR (result
* is zero) or the SIAR (result is non zero).
*/
static inline void perf_read_regs(struct pt_regs *regs)
{
regs->dsisr = mfspr(SPRN_MMCRA);
unsigned long mmcra = mfspr(SPRN_MMCRA);
int marked = mmcra & MMCRA_SAMPLE_ENABLE;
int use_siar;
if (TRAP(regs) != 0xf00)
use_siar = 0;
else if ((ppmu->flags & PPMU_NO_CONT_SAMPLING) && !marked)
use_siar = 0;
else
use_siar = 1;
regs->dsisr = mmcra;
regs->result = use_siar;
}
/*
@ -1342,18 +1351,12 @@ unsigned long perf_misc_flags(struct pt_regs *regs)
*/
unsigned long perf_instruction_pointer(struct pt_regs *regs)
{
unsigned long mmcra = regs->dsisr;
unsigned long use_siar = regs->result;
/* Not a PMU interrupt */
if (TRAP(regs) != 0xf00)
if (use_siar)
return mfspr(SPRN_SIAR) + perf_ip_adjust(regs);
else
return regs->nip;
/* Processor doesn't support sampling non marked events */
if ((ppmu->flags & PPMU_NO_CONT_SAMPLING) &&
!(mmcra & MMCRA_SAMPLE_ENABLE))
return regs->nip;
return mfspr(SPRN_SIAR) + perf_ip_adjust(regs);
}
static bool pmc_overflow(unsigned long val)