powerpc/perf: Use regs->nip when SIAR is zero

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In power10 DD1, there is an issue where the SIAR (Sampled Instruction
Address Register) is not latching to the sampled address during random
sampling. This results in value of 0s in the SIAR. Add a check to use
regs->nip when SIAR is zero.

Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201021085329.384535-5-maddy@linux.ibm.com

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Madhavan Srinivasan 2020-10-21 14:23:29 +05:30 • committed by Michael Ellerman

parent d9f7088dd6

commit 2ca13a4cc5

1 changed files with 17 additions and 4 deletions

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arch/powerpc/perf/core-book3s.c

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