From patchwork Thu Sep 14 18:49:11 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremy Linton X-Patchwork-Id: 9953751 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E77066024A for ; Thu, 14 Sep 2017 18:52:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0E0CF290F1 for ; Thu, 14 Sep 2017 18:52:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 02FC029224; Thu, 14 Sep 2017 18:52:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3FB64290F1 for ; Thu, 14 Sep 2017 18:52:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=f0BhY6s42YE0UVVVzPWRseu9i1cOhbeeieA9AndNsAs=; b=SS+gn4TYaoX/NschRZI54nZSxG ZNmKexg+Eszr8k89T6Zf0e/7L8A1c4f9j/AMwGAFIaUOLKH3IHKNYKu55IRl0FWZNb/PKB5YiEran 6i2fPx3aDMoAvEtx2xxKWsiGGlMHnDCPGzz7NtRhSFzUphyQzAazcbJ61BeA5CUCXtl2mDjwTxUwJ b3l3GG0ugjmxXhxweU33T5jx0ld5gsX33XdpQE08DAiYBlVRwY1aNJM7o3cw6Rs01eZC4sWKprkZK 2kN+Tem+VAeFN78WZqF872PLiX8y7nzbQ/m+Z+yu0FL+RTXUyRBx95gpi+NM3zJQgCjG3ZsFiF8OL 3weNm2Rw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dsZFn-0006DS-Gj; Thu, 14 Sep 2017 18:52:47 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dsZDP-0003Tx-VA for linux-arm-kernel@lists.infradead.org; Thu, 14 Sep 2017 18:50:24 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 49D641715; Thu, 14 Sep 2017 11:49:30 -0700 (PDT) Received: from beelzebub.austin.arm.com (beelzebub.austin.arm.com [10.118.12.119]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 719393F483; Thu, 14 Sep 2017 11:49:29 -0700 (PDT) From: Jeremy Linton To: linux-acpi@vger.kernel.org Subject: [PATCH 6/6] arm64: topology: Enable ACPI/PPTT based CPU topology. Date: Thu, 14 Sep 2017 13:49:11 -0500 Message-Id: <20170914184918.20406-7-jeremy.linton@arm.com> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20170914184918.20406-1-jeremy.linton@arm.com> References: <20170914184918.20406-1-jeremy.linton@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170914_115020_243442_BADBC681 X-CRM114-Status: GOOD ( 14.98 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lorenzo.pieralisi@arm.com, austinwc@codeaurora.org, jhugo@codeaurora.org, will.deacon@arm.com, john.garry@huawei.com, rjw@rjwysocki.net, Jeremy Linton , hanjun.guo@linaro.org, sudeep.holla@arm.com, catalin.marinas@arm.com, wangxiongfeng2@huawei.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Propagate the topology information from the PPTT tree to the cpu_topology array. We can get the thread id, core_id and cluster_id by assuming certain levels of the PPTT tree correspond to those concepts. The package_id is flagged in the tree and can be found by passing an arbitrary large level to setup_acpi_cpu_topology() which terminates its search when it finds an ACPI node flagged as the physical package. If the tree doesn't contain enough levels to represent all of thread/core/cod/package then the package id will be used for the missing levels. Since arm64 machines can have 3 distinct topology levels, and the scheduler only handles sockets/threads well today, we compromise by collapsing into one of three diffrent configurations. These are thread/socket, thread/cluster or cluster/socket depending on whether the machine has threading and multisocket, threading in a single socket, or doesn't have threading. This code is loosely based on a combination of code from: Xiongfeng Wang John Garry Jeffrey Hugo Signed-off-by: Jeremy Linton --- arch/arm64/kernel/topology.c | 68 +++++++++++++++++++++++++++++++++++++++++++- include/linux/topology.h | 2 ++ 2 files changed, 69 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index 9147e5b6326d..8ee5cc5ba9bd 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -11,6 +11,7 @@ * for more details. */ +#include #include #include #include @@ -22,6 +23,7 @@ #include #include #include +#include #include #include @@ -304,6 +306,68 @@ static void __init reset_cpu_topology(void) } } +#ifdef CONFIG_ACPI +/* + * Propagate the topology information of the processor_topology_node tree to the + * cpu_topology array. + */ +static int __init parse_acpi_topology(void) +{ + u64 is_threaded; + int is_multisocket; + int cpu; + int topology_id; + /* set a large depth, to hit ACPI_PPTT_PHYSICAL_PACKAGE if one exists */ + const int max_topo = 0xFF; + + is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK; + is_multisocket = acpi_multisocket_count(); + if (is_multisocket < 0) + return is_multisocket; + + for_each_possible_cpu(cpu) { + topology_id = setup_acpi_cpu_topology(cpu, 0); + if (topology_id < 0) + return topology_id; + + if ((is_threaded) && (is_multisocket > 1)) { + /* MT per core, and multiple sockets */ + cpu_topology[cpu].thread_id = topology_id; + topology_id = setup_acpi_cpu_topology(cpu, 1); + cpu_topology[cpu].core_id = topology_id; + topology_id = setup_acpi_cpu_topology(cpu, 2); + cpu_topology[cpu].cluster_id = topology_id; + topology_id = setup_acpi_cpu_topology(cpu, max_topo); + cpu_topology[cpu].package_id = topology_id; + } else if (is_threaded) { + /* mutltiple threads, but only a single socket */ + cpu_topology[cpu].thread_id = topology_id; + topology_id = setup_acpi_cpu_topology(cpu, 1); + cpu_topology[cpu].core_id = topology_id; + topology_id = setup_acpi_cpu_topology(cpu, 2); + cpu_topology[cpu].cluster_id = topology_id; + cpu_topology[cpu].package_id = topology_id; + } else { + /* no threads, clusters behave like threads */ + cpu_topology[cpu].thread_id = topology_id; + topology_id = setup_acpi_cpu_topology(cpu, 1); + cpu_topology[cpu].core_id = topology_id; + cpu_topology[cpu].cluster_id = topology_id; + topology_id = setup_acpi_cpu_topology(cpu, max_topo); + cpu_topology[cpu].package_id = topology_id; + } + } + return 0; +} + +#else +static int __init parse_acpi_topology(void) +{ + /*ACPI kernels should be built with PPTT support*/ + return -EINVAL; +} +#endif + void __init init_cpu_topology(void) { reset_cpu_topology(); @@ -312,6 +376,8 @@ void __init init_cpu_topology(void) * Discard anything that was parsed if we hit an error so we * don't use partial information. */ - if (of_have_populated_dt() && parse_dt_topology()) + if ((!acpi_disabled) && parse_acpi_topology()) + reset_cpu_topology(); + else if (of_have_populated_dt() && parse_dt_topology()) reset_cpu_topology(); } diff --git a/include/linux/topology.h b/include/linux/topology.h index 4660749a7303..08bf736be7c1 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -43,6 +43,8 @@ if (nr_cpus_node(node)) int arch_update_cpu_topology(void); +int setup_acpi_cpu_topology(unsigned int cpu, int level); +int acpi_multisocket_count(void); /* Conform to ACPI 2.0 SLIT distance definitions */ #define LOCAL_DISTANCE 10