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powerpc/perf: Add support for SIER
On power8 we have a new SIER (Sampled Instruction Event Register), which captures information about instructions when we have random sampling enabled. Add support for loading the SIER into pt_regs, overloading regs->dar. Also set the new NO_SIPR flag in regs->result if we don't have SIPR. Update regs_sihv/sipr() to look for SIPR/SIHV in SIER. 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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@ -53,6 +53,7 @@ struct power_pmu {
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#define PPMU_NO_CONT_SAMPLING 0x00000008 /* no continuous sampling */
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#define PPMU_SIAR_VALID 0x00000010 /* Processor has SIAR Valid bit */
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#define PPMU_HAS_SSLOT 0x00000020 /* Has sampled slot in MMCRA */
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#define PPMU_HAS_SIER 0x00000040 /* Has SIER */
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/*
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* Values for flags to get_alternatives()
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@ -671,6 +671,11 @@
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#define SPRN_PMC8 794
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#define SPRN_SIAR 780
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#define SPRN_SDAR 781
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#define SPRN_SIER 784
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#define SIER_SIPR 0x2000000 /* Sampled MSR_PR */
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#define SIER_SIHV 0x1000000 /* Sampled MSR_HV */
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#define SIER_SIAR_VALID 0x0400000 /* SIAR contents valid */
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#define SIER_SDAR_VALID 0x0200000 /* SDAR contents valid */
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#define SPRN_PA6T_MMCR0 795
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#define PA6T_MMCR0_EN0 0x0000000000000001UL
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@ -140,6 +140,9 @@ static bool regs_sihv(struct pt_regs *regs)
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{
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unsigned long sihv = MMCRA_SIHV;
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if (ppmu->flags & PPMU_HAS_SIER)
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return !!(regs->dar & SIER_SIHV);
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if (ppmu->flags & PPMU_ALT_SIPR)
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sihv = POWER6_MMCRA_SIHV;
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@ -150,6 +153,9 @@ static bool regs_sipr(struct pt_regs *regs)
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{
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unsigned long sipr = MMCRA_SIPR;
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if (ppmu->flags & PPMU_HAS_SIER)
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return !!(regs->dar & SIER_SIPR);
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if (ppmu->flags & PPMU_ALT_SIPR)
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sipr = POWER6_MMCRA_SIPR;
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@ -203,6 +209,7 @@ static inline u32 perf_get_misc_flags(struct pt_regs *regs)
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/*
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* Overload regs->dsisr to store MMCRA so we only need to read it once
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* on each interrupt.
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* Overload regs->dar to store SIER if we have it.
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* Overload regs->result to specify whether we should use the MSR (result
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* is zero) or the SIAR (result is non zero).
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*/
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@ -218,6 +225,18 @@ static inline void perf_read_regs(struct pt_regs *regs)
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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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* On power8 if we're in random sampling mode, the SIER is updated.
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* If we're in continuous sampling mode, we don't have SIPR.
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*/
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if (ppmu->flags & PPMU_HAS_SIER) {
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if (marked)
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regs->dar = mfspr(SPRN_SIER);
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else
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regs->result |= 2;
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}
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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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* not valid. Use pt_regs.
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