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powerpc/perf: Add regs_no_sipr()

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On power8 the presence or absence of SIPR depends on settings at runtime,
so convert to using a dynamic flag for NO_SIPR. Existing backends that
set NO_SIPR unconditionally set the dynamic flag obviously.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2013-04-25 19:28:26 +00:00 committed by Benjamin Herrenschmidt
parent 33904054b4
commit 860aad71fc
1 changed files with 12 additions and 3 deletions
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15
arch/powerpc/perf/core-book3s.c
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@ -156,6 +156,11 @@ 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)
@ -178,7 +183,7 @@ static inline u32 perf_get_misc_flags(struct pt_regs *regs)
* SIAR which should give slightly more reliable
* results
*/
if (ppmu->flags & PPMU_NO_SIPR) {
if (regs_no_sipr(regs)) {
unsigned long siar = mfspr(SPRN_SIAR);
if (siar >= PAGE_OFFSET)
return PERF_RECORD_MISC_KERNEL;
@ -208,6 +213,10 @@ 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;
/*
* If this isn't a PMU exception (eg a software event) the SIAR is
@ -232,12 +241,12 @@ 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 (!(ppmu->flags & PPMU_NO_SIPR) && regs_sipr(regs))
else if (!regs_no_sipr(regs) && regs_sipr(regs))
use_siar = 0;
else
use_siar = 1;
regs->result = use_siar;
regs->result |= use_siar;
}
/*