linux-kernel - [tip:perf/urgent] perf/x86/intel/uncore: Add event constraint for BDX PCU

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Date:   Tue, 14 Nov 2017 08:09:54 -0800
From:   tip-bot for Kan Liang <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     eranian@...gle.com, linux-kernel@...r.kernel.org, hpa@...or.com,
        kan.liang@...el.com, tglx@...utronix.de, mingo@...nel.org
Subject: [tip:perf/urgent] perf/x86/intel/uncore: Add event constraint for
 BDX PCU

Commit-ID:  bb9fbe1b57503f790dbbf9f06e72cb0fb9e60740
Gitweb:     https://git.kernel.org/tip/bb9fbe1b57503f790dbbf9f06e72cb0fb9e60740
Author:     Kan Liang <kan.liang@...el.com>
AuthorDate: Tue, 14 Nov 2017 06:06:40 -0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 14 Nov 2017 17:07:49 +0100

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@...gle.com>
Signed-off-by: Kan Liang <kan.liang@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Stephane Eranian <eranian@...gle.com>
Cc: peterz@...radead.org
Cc: ak@...ux.intel.com
Link: https://lkml.kernel.org/r/1510668400-301000-1-git-send-email-kan.liang@intel.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 95cb19f..f4e4168 100644
--- 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 = {