perf/x86/intel/uncore: Add event constraint for BDX PCU

Event select bit 7 'Use Occupancy' in PCU Box is not available for
counter 0 on BDX

Add a constraint to fix it.

Reported-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: ak@linux.intel.com
Link: https://lkml.kernel.org/r/1510668400-301000-1-git-send-email-kan.liang@intel.com

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 95cb19f..f4e4168 100644 (file)
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -3035,11 +3035,19 @@ static struct intel_uncore_type *bdx_msr_uncores[] = {
        NULL,
 };
 
+/* Bit 7 'Use Occupancy' is not available for counter 0 on BDX */
+static struct event_constraint bdx_uncore_pcu_constraints[] = {
+       EVENT_CONSTRAINT(0x80, 0xe, 0x80),
+       EVENT_CONSTRAINT_END
+};
+
 void bdx_uncore_cpu_init(void)
 {
        if (bdx_uncore_cbox.num_boxes > boot_cpu_data.x86_max_cores)
                bdx_uncore_cbox.num_boxes = boot_cpu_data.x86_max_cores;
        uncore_msr_uncores = bdx_msr_uncores;
+
+       hswep_uncore_pcu.constraints = bdx_uncore_pcu_constraints;
 }
 
 static struct intel_uncore_type bdx_uncore_ha = {