perf/x86/intel: Clean up PEBS-via-PT on hybrid

The PEBS-via-PT feature is exposed for the e-core of some hybrid
platforms, e.g., ADL and MTL. But it never works.

$ dmesg | grep PEBS
[    1.793888] core: cpu_atom PMU driver: PEBS-via-PT

$ perf record -c 1000 -e '{intel_pt/branch=0/,
cpu_atom/cpu-cycles,aux-output/pp}' -C8
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument)
for event (cpu_atom/cpu-cycles,aux-output/pp).
"dmesg | grep -i perf" may provide additional information.

The "PEBS-via-PT" is printed if the corresponding bit of per-PMU
capabilities is set. Since the feature is supported by the e-core HW,
perf sets the bit for e-core. However, for Intel PT, if a feature is not
supported on all CPUs, it is not supported at all. The PEBS-via-PT event
cannot be created successfully.

The PEBS-via-PT is no longer enumerated on the latest hybrid platform. It
will be deprecated on future platforms with Arch PEBS. Let's remove it
from the existing hybrid platforms.

Fixes: d9977c43bff8 ("perf/x86: Register hybrid PMUs")
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250129154820.3755948-2-kan.liang@linux.intel.com

0 files changed, 0 insertions, 0 deletions