linux-kernel - [PATCH 1/3] Fix filter_tid mask for CHA events on Skylake Server

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Message-Id: <20210914175646.35437-2-alexander.antonov@linux.intel.com>
Date:   Tue, 14 Sep 2021 20:56:44 +0300
From:   alexander.antonov@...ux.intel.com
To:     peterz@...radead.org, linux-kernel@...r.kernel.org
Cc:     kan.liang@...ux.intel.c, ak@...ux.intel.comom,
        alexey.v.bayduraev@...ux.intel.com,
        alexander.antonov@...ux.intel.com
Subject: [PATCH 1/3] Fix filter_tid mask for CHA events on Skylake Server

From: Alexander Antonov <alexander.antonov@...ux.intel.com>

According Uncore Reference Manual: any of the CHA events may be filtered
by Thread/Core-ID by using tid modifier in CHA Filter 0 Register.
Update skx_cha_hw_config() to follow Uncore Guide.

Fixes: cd34cd97b7b4 ("perf/x86/intel/uncore: Add Skylake server uncore support")
Signed-off-by: Alexander Antonov <alexander.antonov@...ux.intel.com>
---
 arch/x86/events/intel/uncore_snbep.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 5ddc0f30db6f..9cc65a4194ce 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -3607,7 +3607,9 @@ static int skx_cha_hw_config(struct intel_uncore_box *box, struct perf_event *ev
 {
 	struct hw_perf_event_extra *reg1 = &event->hw.extra_reg;
 	struct extra_reg *er;
-	int idx = 0;
+	/* Any of the CHA events may be filtered by Thread/Core-ID.*/
+	int idx = !!(event->hw.config & SNBEP_CBO_PMON_CTL_TID_EN) ?
+		     SKX_CHA_MSR_PMON_BOX_FILTER_TID : 0;
 
 	for (er = skx_uncore_cha_extra_regs; er->msr; er++) {
 		if (er->event != (event->hw.config & er->config_mask))
-- 
2.21.3