From patchwork Wed Oct 19 12:53:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Conor Dooley X-Patchwork-Id: 13011701 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 18527C4332F for ; Wed, 19 Oct 2022 12:54:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=fdGktMVvEYxWbufDdLFcvwcNC5LoxHNe0aeII8cfyzk=; b=0uwywWva4iHVDu MP+ho/9ZTNdlsetlRx0oSlH/xp4kdJIjQ5EFOYrMVZy2Fzmxn/58Fo/OQ/l6r/PpA8V3BHRcksAvL ne/YerGQ6r+vARVTs0sLo7n70BGzOECstZrYJVJ56064X/2wUoQis8MRVAABWzYnofZLQ8phMaxoL s/fTkGdPntUWhRmiq/aV9pG6HWcodOrQijWUsnWFDDmY5pEBd1UANmIbIJWY6F5fPdZ/KjvFJfaaQ WaH8kLN2sJxMlKVWIgPdduUamp6bIGlXhbSbSYwOYgwMccJBpsyUre2nKhpYWFhs6GMWhsaeujqXu EY/+undCUXO6NIdiAf8Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ol8a6-001lmC-6W; Wed, 19 Oct 2022 12:53:58 +0000 Received: from esa.microchip.iphmx.com ([68.232.153.233]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ol8Zh-001lQA-L0; Wed, 19 Oct 2022 12:53:35 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1666184013; x=1697720013; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=eAJHzmzMTNBBml1IsEoRlVhesYoAxbHDrFN9XFoP2BA=; b=sS2wubi8+HSkJMYHyYOqBrvpH1GfsIFCIi++qFYMmziXIQZIs5WMg7yv XNKfmRHAWokwQs5eUqPAQKw8yNaCB166XQJ25Y7+h5fSUeRItn5XAzHaU kYHnkUwGh1cNun/yrDDPqRtxf9Q/QbSxwXkTTqACfNpswKBiisMhZIGmn zh3IHKEGDsfIuc0CtYnyxG4ZOHUO8XUtDzZXE7gTgAsHRVbSMNiOzpK+p PHO4tN1rQyx2xKFNYpA3C1klxLrxMDN1hh5rtbpvUW5y1NHi+amUXHUDH e/xzDeCkTQYWIbv7/5OTLwJY6+p1zoqAlMgJ61KWPXKZmZvgpzMH6YrE5 g==; 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221019_055333_712077_0452570A X-CRM114-Status: GOOD ( 16.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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