linux-kernel - [PATCH 6/8] x86/cpu: Add helper function get_llc

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Message-Id: <20210817221048.88063-7-kim.phillips@amd.com>
Date:   Tue, 17 Aug 2021 17:10:46 -0500
From:   Kim Phillips <kim.phillips@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Borislav Petkov <bp@...e.de>,
        Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kim Phillips <kim.phillips@....com>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ian Rogers <irogers@...gle.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        Michael Petlan <mpetlan@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Robert Richter <robert.richter@....com>,
        Stephane Eranian <eranian@...gle.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        x86@...nel.org
Subject: [PATCH 6/8] x86/cpu: Add helper function get_llc_id

Factor out a helper function rather than export cpu_llc_id, which is
needed in order to be able to build the AMD uncore driver as a module.

Signed-off-by: Kim Phillips <kim.phillips@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andrew Murray <amurray@...goodpenguin.co.uk>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ian Rogers <irogers@...gle.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Joao Martins <joao.m.martins@...cle.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Michael Petlan <mpetlan@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Robert Richter <robert.richter@....com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Cc: linux-perf-users@...r.kernel.org
Cc: x86@...nel.org
---
 arch/x86/events/amd/uncore.c     | 2 +-
 arch/x86/include/asm/processor.h | 2 ++
 arch/x86/kernel/cpu/amd.c        | 2 +-
 arch/x86/kernel/cpu/common.c     | 6 ++++++
 4 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c
index 7fb50ad171e9..a01f9f1016d9 100644
--- a/arch/x86/events/amd/uncore.c
+++ b/arch/x86/events/amd/uncore.c
@@ -452,7 +452,7 @@ static int amd_uncore_cpu_starting(unsigned int cpu)
 
 	if (amd_uncore_llc) {
 		uncore = *per_cpu_ptr(amd_uncore_llc, cpu);
-		uncore->id = per_cpu(cpu_llc_id, cpu);
+		uncore->id = get_llc_id(cpu);
 
 		uncore = amd_uncore_find_online_sibling(uncore, amd_uncore_llc);
 		*per_cpu_ptr(amd_uncore_llc, cpu) = uncore;
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 1e0d13c9fda6..9ad2acaaae9b 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -797,6 +797,8 @@ extern int set_tsc_mode(unsigned int val);
 
 DECLARE_PER_CPU(u64, msr_misc_features_shadow);
 
+extern u16 get_llc_id(unsigned int cpu);
+
 #ifdef CONFIG_CPU_SUP_AMD
 extern u32 amd_get_nodes_per_socket(void);
 extern u32 amd_get_highest_perf(void);
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index b7c003013d41..2131af9f2fa2 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -438,7 +438,7 @@ static void srat_detect_node(struct cpuinfo_x86 *c)
 
 	node = numa_cpu_node(cpu);
 	if (node == NUMA_NO_NODE)
-		node = per_cpu(cpu_llc_id, cpu);
+		node = get_llc_id(cpu);
 
 	/*
 	 * On multi-fabric platform (e.g. Numascale NumaChip) a
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 64b805bd6a54..0f8885949e8c 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -79,6 +79,12 @@ EXPORT_SYMBOL(smp_num_siblings);
 /* Last level cache ID of each logical CPU */
 DEFINE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id) = BAD_APICID;
 
+u16 get_llc_id(unsigned int cpu)
+{
+	return per_cpu(cpu_llc_id, cpu);
+}
+EXPORT_SYMBOL_GPL(get_llc_id);
+
 /* correctly size the local cpu masks */
 void __init setup_cpu_local_masks(void)
 {
-- 
2.31.1