linux-kernel - [PATCH 3/3] arm64: add arm64 default topology

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Message-Id: <1648545322-14531-4-git-send-email-wangqing@vivo.com>
Date:   Tue, 29 Mar 2022 02:15:21 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH 3/3] arm64: add arm64 default topology

From: Wang Qing <wangqing@...o.com>

default_topology does not fit arm64, especially CPU and cache topology.
Add arm64_topology, so we can do more based on CONFIG_GENERIC_ARCH_TOPOLOGY.

arm64_xxx_flags() prefer to get the cache attribute from DT.

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 arch/arm64/kernel/smp.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 27df5c1..d245012
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -715,6 +715,60 @@ void __init smp_init_cpus(void)
 	}
 }
 
+#ifdef CONFIG_SCHED_CLUSTER
+static int arm64_cluster_flags(const struct cpumask *cpu_map)
+{
+	int flag = cpu_cluster_flags();
+	int ret = cpu_share_private_cache(cpu_map);
+	if (ret == 1)
+		flag |= SD_SHARE_PKG_RESOURCES;
+	else if (ret == 0)
+		flag &= ~SD_SHARE_PKG_RESOURCES;
+
+	return flag;
+}
+#endif
+
+#ifdef CONFIG_SCHED_MC
+static int arm64_core_flags(const struct cpumask *cpu_map)
+{
+	int flag = cpu_core_flags();
+	int ret = cpu_share_private_cache(cpu_map);
+	if (ret == 1)
+		flag |= SD_SHARE_PKG_RESOURCES;
+	else if (ret == 0)
+		flag &= ~SD_SHARE_PKG_RESOURCES;
+
+	return flag;
+}
+#endif
+
+static int arm64_die_flags(const struct cpumask *cpu_map)
+{
+	int flag = 0;
+	int ret = cpu_share_private_cache(cpu_map);
+	if (ret == 1)
+		flag |= SD_SHARE_PKG_RESOURCES;
+	else if (ret == 0)
+		flag &= ~SD_SHARE_PKG_RESOURCES;
+
+	return flag;
+}
+
+static struct sched_domain_topology_level arm64_topology[] = {
+#ifdef CONFIG_SCHED_SMT
+	{ cpu_smt_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
+#endif
+#ifdef CONFIG_SCHED_CLUSTER
+	{ cpu_clustergroup_mask, arm64_cluster_flags, SD_INIT_NAME(CLS) },
+#endif
+#ifdef CONFIG_SCHED_MC
+	{ cpu_coregroup_mask, arm64_core_flags, SD_INIT_NAME(MC) },
+#endif
+	{ cpu_cpu_mask, arm64_die_flags, SD_INIT_NAME(DIE) },
+	{ NULL, },
+};
+
 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
 	const struct cpu_operations *ops;
@@ -723,6 +777,8 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 	unsigned int this_cpu;
 
 	init_cpu_topology();
+	init_cpu_cache_topology();
+	set_sched_topology(arm64_topology);
 
 	this_cpu = smp_processor_id();
 	store_cpu_topology(this_cpu);
-- 
2.7.4