linux-kernel - [PATCH 2/2] perf/x86/amd/uncore: set the thread mask for F17h L3 PMCs

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Date:   Mon, 20 May 2019 22:00:24 +0000
From:   "Phillips, Kim" <kim.phillips@....com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Phillips, Kim" <kim.phillips@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Martin Liška <mliska@...e.cz>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        "Natarajan, Janakarajan" <Janakarajan.Natarajan@....com>,
        "Hook, Gary" <Gary.Hook@....com>, Pu Wen <puwen@...on.cn>,
        Stephane Eranian <eranian@...gle.com>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        "x86@...nel.org" <x86@...nel.org>
Subject: [PATCH 2/2] perf/x86/amd/uncore: set the thread mask for F17h L3 PMCs

From: Kim Phillips <kim.phillips@....com>

Fill in the L3 performance event select register ThreadMask
bitfield, to enable per hardware thread accounting.

Signed-off-by: Kim Phillips <kim.phillips@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Borislav Petkov <bp@...en8.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Martin Liška <mliska@...e.cz>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc: Janakarajan Natarajan <Janakarajan.Natarajan@....com>
Cc: Gary Hook <Gary.Hook@....com>
Cc: Pu Wen <puwen@...on.cn>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: x86@...nel.org
---
 arch/x86/events/amd/uncore.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c
index a8dc2635a719..771e9b3b62eb 100644
--- a/arch/x86/events/amd/uncore.c
+++ b/arch/x86/events/amd/uncore.c
@@ -205,15 +205,22 @@ static int amd_uncore_event_init(struct perf_event *event)
 	hwc->config = event->attr.config & AMD64_RAW_EVENT_MASK_NB;
 	hwc->idx = -1;
 
+	if (event->cpu < 0)
+		return -EINVAL;
+
 	/*
 	 * SliceMask and ThreadMask need to be set for certain L3 events in
 	 * Family 17h. For other events, the two fields do not affect the count.
 	 */
-	if (l3_mask && is_llc_event(event))
-		hwc->config |= (AMD64_L3_SLICE_MASK | AMD64_L3_THREAD_MASK);
+	if (l3_mask && is_llc_event(event)) {
+		int thread = 2 * (cpu_data(event->cpu).cpu_core_id % 4);
 
-	if (event->cpu < 0)
-		return -EINVAL;
+		if (smp_num_siblings > 1)
+			thread += cpu_data(event->cpu).apicid & 1;
+
+		hwc->config |= (1ULL << (AMD64_L3_THREAD_SHIFT + thread) &
+				AMD64_L3_THREAD_MASK) | AMD64_L3_SLICE_MASK;
+	}
 
 	uncore = event_to_amd_uncore(event);
 	if (!uncore)
-- 
2.21.0