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powerpc/perf: Use MSR to report privilege level on P9 DD1

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SIER and SIAR are not updated correctly for some samples, so force the
use of MSR and regs->nip instead for misc_flag updates. This is done by
adding a new ppmu flag and updating the use_siar logic in
perf_read_regs() to use it, and dropping the PPMU_HAS_SIER flag.

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
[mpe: Rename flag to PPMU_NO_SIAR, and also drop PPMU_HAS_SIER]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Madhavan Srinivasan 2017-01-18 09:12:56 +05:30 committed by Michael Ellerman
parent df21d2fa73
commit 27593d72c4
3 changed files with 4 additions and 1 deletions
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1
arch/powerpc/include/asm/perf_event_server.h
View File

@ -65,6 +65,7 @@ struct power_pmu {
#define PPMU_HAS_SSLOT 0x00000020 /* Has sampled slot in MMCRA */
#define PPMU_HAS_SIER 0x00000040 /* Has SIER */
#define PPMU_ARCH_207S 0x00000080 /* PMC is architecture v2.07S */
#define PPMU_NO_SIAR 0x00000100 /* Do not use SIAR */
/*
* Values for flags to get_alternatives()

2
arch/powerpc/perf/core-book3s.c
View File

@ -295,6 +295,8 @@ static inline void perf_read_regs(struct pt_regs *regs)
*/
if (TRAP(regs) != 0xf00)
use_siar = 0;
else if ((ppmu->flags & PPMU_NO_SIAR))
use_siar = 0;
else if (marked)
use_siar = 1;
else if ((ppmu->flags & PPMU_NO_CONT_SAMPLING))

2
arch/powerpc/perf/power9-pmu.c
View File

@ -384,7 +384,7 @@ static struct power_pmu power9_isa207_pmu = {
.bhrb_filter_map = power9_bhrb_filter_map,
.get_constraint = isa207_get_constraint,
.disable_pmc = isa207_disable_pmc,
.flags = PPMU_HAS_SIER | PPMU_ARCH_207S,
.flags = PPMU_NO_SIAR | PPMU_ARCH_207S,
.n_generic = ARRAY_SIZE(power9_generic_events),
.generic_events = power9_generic_events,
.cache_events = &power9_cache_events,