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Subject[PATCH] perf/x86/intel/uncore: add event constraint for BDX PCU
Date
From: Kan Liang <kan.liang@intel.com>

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>
Tested-by: Stephane Eranian <eranian@google.com>
---
arch/x86/events/intel/uncore_snbep.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index d5b4398..3991032 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -3034,11 +3034,19 @@ 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 = {
--
2.4.3
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