From patchwork Tue Nov 7 10:28:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King (Oracle)" X-Patchwork-Id: 13448404 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 E6382C4332F for ; Tue, 7 Nov 2023 10:31:45 +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:Subject:Cc:To: From:Date: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=GqfS3RPA7Dya7nJEkZT0D5DqF4NsUPDYgTZLzUy2cJo=; b=XNjgawEMmA0N01 HOMIN8wu5bQ9zzGYr+VW6aC4S3yB5sUqHcfKNFoDKNvfRVozGqceExig8t2j4ZEhlOrDb5QclP+/P eYl8AR22Ic5etpvIgWtGj0X0Ox1yJJvDxzQo2tc3tYrsElSzpAIz1+lC4J9p6ci5XQiAC84gtu/VO /Q8vGs6aovS68uQSP/3FuDKkUCsbmHUJSrccjDsSR+r5ibMemWKtaxczjrzuz/PXL3Pd7LW46GkFN 3hgCqRkrDSwnaaGXMfxvt81klb88NLBRRy8ZvutaM0pC1wZJh0A37BYo0onOzj5n0Y0xFDr8cWLwh FSjDO3Ab/7oobIdBAF/g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r0JMZ-0014BI-0t; Tue, 07 Nov 2023 10:31:15 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r0JMW-0012ue-0A; Tue, 07 Nov 2023 10:31:13 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:Content-Type:MIME-Version: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=mnU5AkoHae2A4t/6hUnkAeF1QeR2fa8gldl6fabdpys=; b=Xvbg8rVwQvptDasFluB1GivJJR lkmYK9tHPkK3vfKg66aLbO07r9lL+qDWdsMtP1fVlOa8E6KTkOYoEs2lwy4BuATJgRxBHul9tXxli QGqH/a1GwQbXH4Ty2qge3vzSS6Lc2LavAFmQ5ENfzpAimPTrAHwq4g364DPRdQkTj0tDP0qjcdxfK STyjqt1AJWeyZh74VX0SvsNhUiKdGJQ5F9Q8X2OntVFa17qD+omT8nLqUX52QnKNsc7MXWynhIz17 xiLH8jwcSjSqGdcRk8+6xspJu1Yko/6rlvG1nsItzUsrSafRMYvzk7lo3JLicVij5zIccje25TllF GUWgjCdw==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:37708) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1r0JKK-0000DJ-2j; Tue, 07 Nov 2023 10:28:56 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1r0JKF-0006qX-KE; Tue, 07 Nov 2023 10:28:51 +0000 Date: Tue, 7 Nov 2023 10:28:51 +0000 From: "Russell King (Oracle)" To: linux-pm@vger.kernel.org, loongarch@lists.linux.dev, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, kvmarm@lists.linux.dev, x86@kernel.org, linux-csky@vger.kernel.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org Cc: Albert Ou , Borislav Petkov , Catalin Marinas , Dave Hansen , Greg Kroah-Hartman , Guo Ren , "H. Peter Anvin" , Huacai Chen , Ingo Molnar , James Morse , Jean-Philippe Brucker , jianyong.wu@arm.com, justin.he@arm.com, Len Brown , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , "Rafael J. Wysocki" , Salil Mehta , Sudeep Holla , Thomas Gleixner , WANG Xuerui , Will Deacon Subject: [PATCH RFC 00/22] Initial cleanups for vCPU hotplug Message-ID: MIME-Version: 1.0 Content-Disposition: inline X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231107_023112_086761_436CEAEF X-CRM114-Status: GOOD ( 17.37 ) 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 Hi, Rather than posting the entire set of vCPU kernel patches, this is a subset of those patches which I hope will be able to be appropriately queued for the next merge window. I am also hoping that nothing here is covered by Rafael's concerns he alluded to in his response to the RFC v3 series. This series aims to switch most architectures over to using generic CPU devices rather than arch specific implementations, which I think is worthwhile doing even if the vCPU hotplug series needs further work. Since this series changes the init order (node_dev_init() vs cpu_dev_init()) and later on in the vCPU hotplug series move the location that CPUs are registered, the first two patches head off problems with register_cpu_capacity_sysctl() and the intel_epb code. These two were ordered later in the original series. The next pair of patches are new and remove the exports of arch_*register_cpu() which are not necessary - these functions are only called from non-modular code - drivers/base/cpu.c and acpi_processor.c both of which can only be built-in. The majority of the other patches come from the vCPU hotplug RFC v3 series I posted earlier, rebased on Linus' current tip, but with some new patches adding arch_cpu_is_hotpluggable() as the remaining arch_register_cpu() functions only differ in the setting of the hotpluggable member of the CPU device - so let's get generic code doing that and provide a way for an architecture to specify whether a CPU is hotpluggable. I would appreciate testing reports on loongarch, riscv and x86 platforms please. Thanks! arch/arm64/Kconfig | 1 + arch/arm64/include/asm/cpu.h | 1 - arch/arm64/kernel/setup.c | 13 ++----------- arch/loongarch/Kconfig | 2 ++ arch/loongarch/kernel/topology.c | 42 ++-------------------------------------- arch/riscv/Kconfig | 1 + arch/riscv/kernel/setup.c | 18 ++--------------- arch/x86/Kconfig | 2 ++ arch/x86/include/asm/cpu.h | 4 ---- arch/x86/kernel/cpu/intel_epb.c | 2 +- arch/x86/kernel/topology.c | 33 ++----------------------------- drivers/acpi/Kconfig | 1 - drivers/acpi/acpi_processor.c | 18 ----------------- drivers/base/arch_topology.c | 38 ++++++++++++++++++++++++------------ drivers/base/cpu.c | 39 +++++++++++++++++++++++++++++-------- drivers/base/init.c | 2 +- drivers/base/node.c | 7 ------- include/linux/cpu.h | 5 +++++ 18 files changed, 78 insertions(+), 151 deletions(-)