linux-kernel - [PATCH 4.14 125/157] perf/x86/intel/uncore: Add event constraint for BDX PCU

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Date:   Sun,  1 Jul 2018 18:23:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stephane Eranian <eranian@...gle.com>,
        Kan Liang <kan.liang@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>, peterz@...radead.org,
        ak@...ux.intel.com, "Jin, Yao" <yao.jin@...ux.intel.com>
Subject: [PATCH 4.14 125/157] perf/x86/intel/uncore: Add event constraint for BDX PCU

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kan Liang <kan.liang@...el.com>

commit bb9fbe1b57503f790dbbf9f06e72cb0fb9e60740 upstream.

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
Cc: "Jin, Yao" <yao.jin@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/events/intel/uncore_snbep.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- 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
 	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 = {