perf/amd/uncore: Replace manual sampling check with CAP_NO_INTERRUPT flag
authorKim Phillips <kim.phillips@amd.com>
Wed, 11 Mar 2020 19:13:21 +0000 (14:13 -0500)
committerBorislav Petkov <bp@suse.de>
Thu, 12 Mar 2020 13:08:50 +0000 (14:08 +0100)
commitf967140dfb7442e2db0868b03b961f9c59418a1b
treea1ab02af8622ba16f4df0964f77d0d12dd9213ce
parent798048f85093901f475d25b2ac8d9ea1bc6d471a
perf/amd/uncore: Replace manual sampling check with CAP_NO_INTERRUPT flag

Enable the sampling check in kernel/events/core.c::perf_event_open(),
which returns the more appropriate -EOPNOTSUPP.

BEFORE:

  $ sudo perf record -a -e instructions,l3_request_g1.caching_l3_cache_accesses true
  Error:
  The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (l3_request_g1.caching_l3_cache_accesses).
  /bin/dmesg | grep -i perf may provide additional information.

With nothing relevant in dmesg.

AFTER:

  $ sudo perf record -a -e instructions,l3_request_g1.caching_l3_cache_accesses true
  Error:
  l3_request_g1.caching_l3_cache_accesses: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'

Fixes: c43ca5091a37 ("perf/x86/amd: Add support for AMD NB and L2I "uncore" counters")
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200311191323.13124-1-kim.phillips@amd.com
arch/x86/events/amd/uncore.c