From: Kan Liang kan.liang@linux.intel.com
commit 1d5c7880992a06679585e7e568cc679c0c5fd4f2 upstream.
Perf errors out when sampling instructions:ppp.
$ perf record -e instructions:ppp -- true Error: The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (instructions:ppp).
The instruction PDIR is only available on the fixed counter 0. The event constraint has been updated to fixed0_constraint in icl_get_event_constraints(). The Sapphire Rapids codes unconditionally error out for the event which is not available on the GP counter 0.
Make the instructions:ppp an exception.
Fixes: 61b985e3e775 ("perf/x86/intel: Add perf core PMU support for Sapphire Rapids") Reported-by: Yasin, Ahmad ahmad.yasin@intel.com Signed-off-by: Kan Liang kan.liang@linux.intel.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/1624029174-122219-4-git-send-email-kan.liang@linux... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/events/intel/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -4032,8 +4032,10 @@ spr_get_event_constraints(struct cpu_hw_ * The :ppp indicates the Precise Distribution (PDist) facility, which * is only supported on the GP counter 0. If a :ppp event which is not * available on the GP counter 0, error out. + * Exception: Instruction PDIR is only available on the fixed counter 0. */ - if (event->attr.precise_ip == 3) { + if ((event->attr.precise_ip == 3) && + !constraint_match(&fixed0_constraint, event->hw.config)) { if (c->idxmsk64 & BIT_ULL(0)) return &counter0_constraint;