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powerpc/perf: Revert to original NO_SIPR logic 

This is a revert and then some of commit 860aad7 "Add regs_no_sipr()".
This workaround was only needed on early chip versions.

As before NO_SIPR becomes a static flag of the PMU struct.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2013-05-15 20:19:30 +00:00 committed by Benjamin Herrenschmidt
parent 858957ab1e
commit cbda6aa10b
1 changed files with 6 additions and 24 deletions
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30
arch/powerpc/perf/core-book3s.c
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@ -110,7 +110,7 @@ static inline void power_pmu_bhrb_read(struct cpu_hw_events *cpuhw) {}
static bool regs_use_siar(struct pt_regs *regs)
{
return !!(regs->result & 1);
return !!regs->result;
}
/*
@ -181,11 +181,6 @@ static bool regs_sipr(struct pt_regs *regs)
return !!(regs->dsisr & sipr);
}
static bool regs_no_sipr(struct pt_regs *regs)
{
return !!(regs->result & 2);
}
static inline u32 perf_flags_from_msr(struct pt_regs *regs)
{
if (regs->msr & MSR_PR)
@ -208,7 +203,7 @@ static inline u32 perf_get_misc_flags(struct pt_regs *regs)
* SIAR which should give slightly more reliable
* results
*/
if (regs_no_sipr(regs)) {
if (ppmu->flags & PPMU_NO_SIPR) {
unsigned long siar = mfspr(SPRN_SIAR);
if (siar >= PAGE_OFFSET)
return PERF_RECORD_MISC_KERNEL;
@ -239,22 +234,9 @@ static inline void perf_read_regs(struct pt_regs *regs)
int use_siar;
regs->dsisr = mmcra;
regs->result = 0;
if (ppmu->flags & PPMU_NO_SIPR)
regs->result |= 2;
/*
* On power8 if we're in random sampling mode, the SIER is updated.
* If we're in continuous sampling mode, we don't have SIPR.
*/
if (ppmu->flags & PPMU_HAS_SIER) {
if (marked)
regs->dar = mfspr(SPRN_SIER);
else
regs->result |= 2;
}
if (ppmu->flags & PPMU_HAS_SIER)
regs->dar = mfspr(SPRN_SIER);
/*
* If this isn't a PMU exception (eg a software event) the SIAR is
@ -279,12 +261,12 @@ static inline void perf_read_regs(struct pt_regs *regs)
use_siar = 1;
else if ((ppmu->flags & PPMU_NO_CONT_SAMPLING))
use_siar = 0;
else if (!regs_no_sipr(regs) && regs_sipr(regs))
else if (!(ppmu->flags & PPMU_NO_SIPR) && regs_sipr(regs))
use_siar = 0;
else
use_siar = 1;
regs->result |= use_siar;
regs->result = use_siar;
}
/*