linux-kernel - [tip: perf/core] perf/amd/uncore: Make L3 thread mask code more readable

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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: Make L3 thread mask code more readable

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

Commit-ID:     9689dbbeaea884d19e3085439c6a247ef986b2af
Gitweb:        https://git.kernel.org/tip/9689dbbeaea884d19e3085439c6a247ef986b2af
Author:        Kim Phillips <kim.phillips@....com>
AuthorDate:    Fri, 13 Mar 2020 18:10:23 -05:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Tue, 17 Mar 2020 13:00:49 +01:00

perf/amd/uncore: Make L3 thread mask code more readable

Convert the l3_thread_slice_mask() function to use the more readable
topology_* helper functions, more intuitive variable names like shift
and thread_mask, and BIT_ULL().

No functional changes.

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/20200313231024.17601-2-kim.phillips@amd.com
---
 arch/x86/events/amd/uncore.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c
index 2abcb1a..07af497 100644
--- a/arch/x86/events/amd/uncore.c
+++ b/arch/x86/events/amd/uncore.c
@@ -185,13 +185,16 @@ static void amd_uncore_del(struct perf_event *event, int flags)
  */
 static u64 l3_thread_slice_mask(int cpu)
 {
-	int thread = 2 * (cpu_data(cpu).cpu_core_id % 4);
+	u64 thread_mask, core = topology_core_id(cpu);
+	unsigned int shift, thread = 0;
 
-	if (smp_num_siblings > 1)
-		thread += cpu_data(cpu).apicid & 1;
+	if (topology_smt_supported() && !topology_is_primary_thread(cpu))
+		thread = 1;
 
-	return (1ULL << (AMD64_L3_THREAD_SHIFT + thread) &
-		AMD64_L3_THREAD_MASK) | AMD64_L3_SLICE_MASK;
+	shift = AMD64_L3_THREAD_SHIFT + 2 * (core % 4) + thread;
+	thread_mask = BIT_ULL(shift);
+
+	return AMD64_L3_SLICE_MASK | thread_mask;
 }
 
 static int amd_uncore_event_init(struct perf_event *event)