linux-kernel - [tip: perf/core] perf/amd/uncore: Prepare L3 thread mask code for Family 19h

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Date:   Tue, 17 Mar 2020 12:07:42 -0000
From:   "tip-bot2 for Kim Phillips" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Kim Phillips <kim.phillips@....com>, Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: perf/core] perf/amd/uncore: Prepare L3 thread mask code for Family 19h

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     4dcc3df82573a946c620dda5fb00e27c7b080105
Gitweb:        https://git.kernel.org/tip/4dcc3df82573a946c620dda5fb00e27c7b080105
Author:        Kim Phillips <kim.phillips@....com>
AuthorDate:    Fri, 13 Mar 2020 18:10:22 -05:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Tue, 17 Mar 2020 13:00:29 +01:00

perf/amd/uncore: Prepare L3 thread mask code for Family 19h

In order to better accommodate the upcoming Family 19h, given
the 80-char line limit, move the existing code into a new
l3_thread_slice_mask() function.

No functional changes.

 [ bp: Touchups. ]

Signed-off-by: Kim Phillips <kim.phillips@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20200313231024.17601-1-kim.phillips@amd.com
---
 arch/x86/events/amd/uncore.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c
index a6ea07f..2abcb1a 100644
--- a/arch/x86/events/amd/uncore.c
+++ b/arch/x86/events/amd/uncore.c
@@ -180,6 +180,20 @@ static void amd_uncore_del(struct perf_event *event, int flags)
 	hwc->idx = -1;
 }
 
+/*
+ * Convert logical CPU number to L3 PMC Config ThreadMask format
+ */
+static u64 l3_thread_slice_mask(int cpu)
+{
+	int thread = 2 * (cpu_data(cpu).cpu_core_id % 4);
+
+	if (smp_num_siblings > 1)
+		thread += cpu_data(cpu).apicid & 1;
+
+	return (1ULL << (AMD64_L3_THREAD_SHIFT + thread) &
+		AMD64_L3_THREAD_MASK) | AMD64_L3_SLICE_MASK;
+}
+
 static int amd_uncore_event_init(struct perf_event *event)
 {
 	struct amd_uncore *uncore;
@@ -209,15 +223,8 @@ static int amd_uncore_event_init(struct perf_event *event)
 	 * 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)) {
-		int thread = 2 * (cpu_data(event->cpu).cpu_core_id % 4);
-
-		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;
-	}
+	if (l3_mask && is_llc_event(event))
+		hwc->config |= l3_thread_slice_mask(event->cpu);
 
 	uncore = event_to_amd_uncore(event);
 	if (!uncore)