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[2620:137:e000::1:20]) by mx.google.com with ESMTP id dz10-20020a0564021d4a00b00457f138ed4asi15851762edb.378.2022.10.19.06.12.54; Wed, 19 Oct 2022 06:13:23 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@microchip.com header.s=mchp header.b=A50WR6gp; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=microchip.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232182AbiJSNKr (ORCPT + 99 others); Wed, 19 Oct 2022 09:10:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233017AbiJSNJ4 (ORCPT ); Wed, 19 Oct 2022 09:09:56 -0400 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 883318E735; Wed, 19 Oct 2022 05:55:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1666184104; x=1697720104; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=eAJHzmzMTNBBml1IsEoRlVhesYoAxbHDrFN9XFoP2BA=; b=A50WR6gprjTtjMr4xhNM/NXBdah8jy4iC8qzQ7f6J+p6bgy7YGMJ/VCa hRntY9GLgKIjlE+hb4u9HjjiopoCfWEhzw4JzdoShDG6sE2bvNNZhsKiF cvLx9E22+W+6XuHVhnbGRRaaXWZ0tjGVu393CGpv00va6rNcip6qNi4ld NB/7rcXDEwvBNkPKayElXT9P+NUyNVlgXiAeZBzV/BnTpLsBz5YqammhN kQKrvVmf7Zb7nVvpDbVvx3xEQwz3IM2+sB/bOWSUPTpBnav4nPPj5sJoR Ir65Bx6o3q2p3mdi6PtdILb3z5ua3qfo5R5S5aOCalryFxBVour+0n0+V A==; X-IronPort-AV: E=Sophos;i="5.95,196,1661842800"; d="scan'208";a="185504900" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa3.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 19 Oct 2022 05:53:33 -0700 Received: from chn-vm-ex04.mchp-main.com (10.10.85.152) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.12; Wed, 19 Oct 2022 05:53:20 -0700 Received: from wendy.microchip.com (10.10.115.15) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server id 15.1.2507.12 via Frontend Transport; Wed, 19 Oct 2022 05:53:18 -0700 From: Conor Dooley To: CC: , , , , , , , , , , , Atish Patra Subject: [PATCH 5.10 1/2] arm64: topology: move store_cpu_topology() to shared code Date: Wed, 19 Oct 2022 13:53:02 +0100 Message-ID: <20221019125303.2845522-1-conor.dooley@microchip.com> X-Mailer: git-send-email 2.38.0 MIME-Version: 1.0 X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747121773114895455?= X-GMAIL-MSGID: =?utf-8?q?1747121815485989605?= commit 456797da792fa7cbf6698febf275fe9b36691f78 upstream. arm64's method of defining a default cpu topology requires only minimal changes to apply to RISC-V also. The current arm64 implementation exits early in a uniprocessor configuration by reading MPIDR & claiming that uniprocessor can rely on the default values. This is appears to be a hangover from prior to '3102bc0e6ac7 ("arm64: topology: Stop using MPIDR for topology information")', because the current code just assigns default values for multiprocessor systems. With the MPIDR references removed, store_cpu_topolgy() can be moved to the common arch_topology code. Reviewed-by: Sudeep Holla Acked-by: Catalin Marinas Reviewed-by: Atish Patra Signed-off-by: Conor Dooley --- arch/arm64/kernel/topology.c | 40 ------------------------------------ drivers/base/arch_topology.c | 19 +++++++++++++++++ 2 files changed, 19 insertions(+), 40 deletions(-) diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index 4358bc319306..f35af19b7055 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -22,46 +22,6 @@ #include #include -void store_cpu_topology(unsigned int cpuid) -{ - struct cpu_topology *cpuid_topo = &cpu_topology[cpuid]; - u64 mpidr; - - if (cpuid_topo->package_id != -1) - goto topology_populated; - - mpidr = read_cpuid_mpidr(); - - /* Uniprocessor systems can rely on default topology values */ - if (mpidr & MPIDR_UP_BITMASK) - return; - - /* - * This would be the place to create cpu topology based on MPIDR. - * - * However, it cannot be trusted to depict the actual topology; some - * pieces of the architecture enforce an artificial cap on Aff0 values - * (e.g. GICv3's ICC_SGI1R_EL1 limits it to 15), leading to an - * artificial cycling of Aff1, Aff2 and Aff3 values. IOW, these end up - * having absolutely no relationship to the actual underlying system - * topology, and cannot be reasonably used as core / package ID. - * - * If the MT bit is set, Aff0 *could* be used to define a thread ID, but - * we still wouldn't be able to obtain a sane core ID. This means we - * need to entirely ignore MPIDR for any topology deduction. - */ - cpuid_topo->thread_id = -1; - cpuid_topo->core_id = cpuid; - cpuid_topo->package_id = cpu_to_node(cpuid); - - pr_debug("CPU%u: cluster %d core %d thread %d mpidr %#016llx\n", - cpuid, cpuid_topo->package_id, cpuid_topo->core_id, - cpuid_topo->thread_id, mpidr); - -topology_populated: - update_siblings_masks(cpuid); -} - #ifdef CONFIG_ACPI static bool __init acpi_cpu_is_threaded(int cpu) { diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c index 8272a3a002a3..51647926e605 100644 --- a/drivers/base/arch_topology.c +++ b/drivers/base/arch_topology.c @@ -596,4 +596,23 @@ void __init init_cpu_topology(void) else if (of_have_populated_dt() && parse_dt_topology()) reset_cpu_topology(); } + +void store_cpu_topology(unsigned int cpuid) +{ + struct cpu_topology *cpuid_topo = &cpu_topology[cpuid]; + + if (cpuid_topo->package_id != -1) + goto topology_populated; + + cpuid_topo->thread_id = -1; + cpuid_topo->core_id = cpuid; + cpuid_topo->package_id = cpu_to_node(cpuid); + + pr_debug("CPU%u: package %d core %d thread %d\n", + cpuid, cpuid_topo->package_id, cpuid_topo->core_id, + cpuid_topo->thread_id); + +topology_populated: + update_siblings_masks(cpuid); +} #endif