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From: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
To: mpe@ellerman.id.au
Cc: mikey@neuling.org, maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 2/4] powerpc/perf: Using SIER[CMPL] instead of SIER[SIAR_VALID]
Date: Thu,  8 Oct 2020 06:52:07 -0400
Message-ID: <1602154329-2092-3-git-send-email-atrajeev@linux.vnet.ibm.com> (raw)
In-Reply-To: <1602154329-2092-1-git-send-email-atrajeev@linux.vnet.ibm.com>

On power10 DD1, there is an issue that causes the SIAR_VALID
bit of Sampled Instruction Event Register(SIER) not to be
set. But the SIAR_VALID bit is used for fetching the instruction
address from Sampled Instruction Address Register(SIAR), and
marked events are sampled only if the SIAR_VALID bit is set.
So add a condition check for power10 DD1 to use SIER[CMPL] bit
instead.

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
---
 arch/powerpc/perf/core-book3s.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 08643cb..d766090 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -350,7 +350,14 @@ static inline int siar_valid(struct pt_regs *regs)
 	int marked = mmcra & MMCRA_SAMPLE_ENABLE;
 
 	if (marked) {
-		if (ppmu->flags & PPMU_HAS_SIER)
+		/*
+		 * SIER[SIAR_VALID] is not set for some
+		 * marked events on power10 DD1, so use
+		 * SIER[CMPL] instead.
+		 */
+		if (ppmu->flags & PPMU_P10_DD1)
+			return regs->dar & 0x1;
+		else if (ppmu->flags & PPMU_HAS_SIER)
 			return regs->dar & SIER_SIAR_VALID;
 
 		if (ppmu->flags & PPMU_SIAR_VALID)
-- 
1.8.3.1


  parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-08 10:52 [PATCH 0/4] powerpc/perf: Power PMU fixes for power10 DD1 Athira Rajeev
2020-10-08 10:52 ` [PATCH 1/4] powerpc/perf: Add new power pmu flag "PPMU_P10_DD1" " Athira Rajeev
2020-10-08 10:52 ` Athira Rajeev [this message]
2020-10-08 10:52 ` [PATCH 3/4] powerpc/perf: Use the address from SIAR register to set cpumode flags Athira Rajeev
2020-10-08 10:52 ` [PATCH 4/4] powerpc/perf: Exclude kernel samples while counting events in user space Athira Rajeev

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