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powerpc/perf: Add regs_no_sipr()
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>
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@ -156,6 +156,11 @@ static bool regs_sipr(struct pt_regs *regs)
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return !!(regs->dsisr & sipr);
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}
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static bool regs_no_sipr(struct pt_regs *regs)
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{
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return !!(regs->result & 2);
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}
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static inline u32 perf_flags_from_msr(struct pt_regs *regs)
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{
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if (regs->msr & MSR_PR)
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@ -178,7 +183,7 @@ static inline u32 perf_get_misc_flags(struct pt_regs *regs)
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* SIAR which should give slightly more reliable
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* results
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*/
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if (ppmu->flags & PPMU_NO_SIPR) {
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if (regs_no_sipr(regs)) {
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unsigned long siar = mfspr(SPRN_SIAR);
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if (siar >= PAGE_OFFSET)
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return PERF_RECORD_MISC_KERNEL;
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@ -208,6 +213,10 @@ static inline void perf_read_regs(struct pt_regs *regs)
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int use_siar;
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regs->dsisr = mmcra;
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regs->result = 0;
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if (ppmu->flags & PPMU_NO_SIPR)
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regs->result |= 2;
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/*
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* If this isn't a PMU exception (eg a software event) the SIAR is
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@ -232,12 +241,12 @@ static inline void perf_read_regs(struct pt_regs *regs)
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use_siar = 1;
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else if ((ppmu->flags & PPMU_NO_CONT_SAMPLING))
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use_siar = 0;
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else if (!(ppmu->flags & PPMU_NO_SIPR) && regs_sipr(regs))
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else if (!regs_no_sipr(regs) && regs_sipr(regs))
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use_siar = 0;
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else
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use_siar = 1;
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regs->result = use_siar;
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regs->result |= use_siar;
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}
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/*
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