perf/x86/intel/uncore: Fix uncore_die_to_cpu() for offline dies

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If the die is offline when uncore_die_to_cpu() is called, it silently
returns 0, which is misleading.  Return -1 in this case to indicate
that all CPUs on the die are offline and the caller can take care of
it accordingly.

Opportunistically, replace -EPERM with -ENODEV, as -ENODEV is
the appropriate error when no CPUs are online across all dies.

Signed-off-by: Zide Chen <zide.chen@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://patch.msgid.link/20260602144908.263680-7-zide.chen@intel.com

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Zide Chen 2026-06-02 07:49:07 -07:00 • committed by Peter Zijlstra

parent ce044cfb7a

commit 2aa7dacf8a

2 changed files with 8 additions and 3 deletions

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2

arch/x86/events/intel/uncore.c

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9

arch/x86/events/intel/uncore_snbep.c

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