powerpc/perf: Infrastructure to support checking of attr.config*

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Introduce code to support the checking of attr.config* for
values which are reserved for a given platform.
Performance Monitoring Unit (PMU) configuration registers
have fields that are reserved and some specific values for
bit fields are reserved. For ex., MMCRA[61:62] is
Random Sampling Mode (SM) and value of 0b11 for this field
is reserved.

Writing non-zero or invalid values in these fields will
have unknown behaviours.

Patch adds a generic call-back function "check_attr_config"
in "struct power_pmu", to be called in event_init to
check for attr.config* values for a given platform.

Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210408074504.248211-1-maddy@linux.ibm.com

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Madhavan Srinivasan 2021-04-08 13:15:03 +05:30 • committed by Michael Ellerman

parent 59fd366b9b

commit 2e2a441d2c

2 changed files with 17 additions and 0 deletions

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6

arch/powerpc/include/asm/perf_event_server.h

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11

arch/powerpc/perf/core-book3s.c

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