From patchwork Tue May 25 15:14:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 12279205 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D67AC2B9F8 for ; Tue, 25 May 2021 15:17:43 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id E61C761159 for ; Tue, 25 May 2021 15:17:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E61C761159 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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=Z019t+oxKcSuFoATVqBrhmPZlPIopZk1q9UTNn8kkOY=; b=oKYKyUMdnFpawe wrxgDSlJMtNu4BOUJFQsLkanc46N1FY5ljF38s584+JFlF2CCKFq7k00R0jMBI6NEvMhqFuXiS7HI cdeoaNnOkNXd2OOtsqtmvVQJvl/P9mv0ve2T3Qo4fP8pQC+9xUWFhMLWMJ2CeMxChnwdm/eDav26v JhTvJJT9UH+/45HevRTLUJzpptN7JFx2FVGdZbZ11+r24a/vGhjCvtLUwyKcjyO1dCzBhOVbiaG22 7fpFE9VjqIeh8dgkY8zE21kewwdGYxnzLwlamzFnZAXJwegkFmyoWM37izI0LtCxYB79cQnOxSJpV B1NM1okk6tLh1P75wTQg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1llYm9-005tUF-0d; Tue, 25 May 2021 15:15:21 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1llYm4-005tSh-Vo for linux-arm-kernel@lists.infradead.org; Tue, 25 May 2021 15:15:18 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id C1EBB6141C; Tue, 25 May 2021 15:15:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621955716; bh=VuWyCYBd+Pcg6EfPgBrmBqLbQhO5LCy7WzJg2drhWmo=; h=From:To:Cc:Subject:Date:From; b=Babp0+Pg6rDUQiFi/JZ8jy7Nw2VJbsLcrtjBPzDIYB4mHOgzwQxaNF8UJeSqJ8Sht HwOUafC9OuJAU3jxpATM0PTSXw54I8ocERBQlgksN2NEKHRHx7xJNC1ePbd2aohepB 6pwrC/ZabAEl0y8metSnXZw9ZOROdSLZFJmvA4r+inRqm1mN4z0pfIEIt3RSYNNGDN cCQoNbykBc2hFKamG7VYXtyvRWRKGytZlBCqTBqpQdmYvtZQ4/uLne+Q7dOli1vSJP qSG0IFYu47I5AOyeRRo6CKreQY2r6Vo8LGkt3W4Gl2WSEGTfKPw/aeURMGyJVPnv4F aQGqtouWQD5Sw== From: Will Deacon To: linux-arm-kernel@lists.infradead.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Will Deacon , Catalin Marinas , Marc Zyngier , Greg Kroah-Hartman , Peter Zijlstra , Morten Rasmussen , Qais Yousef , Suren Baghdasaryan , Quentin Perret , Tejun Heo , Johannes Weiner , Ingo Molnar , Juri Lelli , Vincent Guittot , "Rafael J. Wysocki" , Dietmar Eggemann , Daniel Bristot de Oliveira , kernel-team@android.com Subject: [PATCH v7 00/22] Add support for 32-bit tasks on asymmetric AArch32 systems Date: Tue, 25 May 2021 16:14:10 +0100 Message-Id: <20210525151432.16875-1-will@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210525_081517_090738_2ABFD2FB X-CRM114-Status: GOOD ( 14.61 ) 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 all, Here is v7 of the asymmetric 32-bit support patches that I previously posted here: v1: https://lore.kernel.org/r/20201027215118.27003-1-will@kernel.org v2: https://lore.kernel.org/r/20201109213023.15092-1-will@kernel.org v3: https://lore.kernel.org/r/20201113093720.21106-1-will@kernel.org v4: https://lore.kernel.org/r/20201124155039.13804-1-will@kernel.org v5: https://lore.kernel.org/r/20201208132835.6151-1-will@kernel.org v6: https://lore.kernel.org/r/20210518094725.7701-1-will@kernel.org There was also a nice LWN writeup in case you've forgotten what this is about: https://lwn.net/Articles/838339/ Changes since v6 include: * Bug fix for a pre-existing scheduler migration bug spotted by Valentin (nice work!). I've put this patch at the start. * Prevent execve() of a 32-bit program from a 64-bit deadline task if the forced affinity would violate admission control * Fixed a memory leak and missing rcu_read_lock() spotted by Qais (thanks!) * Handle race between forcing affinity on execve() and CPU hot-unplug * Updated documentation * Introduce task_cpu_possible() macro as suggested by Peter Z * Added some acks/reviewed-by tags, although I didn't include these where patches have changed significantly since last time. Series now based on v5.13-rc3 to avoid conflicting with arm64 cpucaps rework merged at -rc2. Cheers, Will Cc: Catalin Marinas Cc: Marc Zyngier Cc: Greg Kroah-Hartman Cc: Peter Zijlstra Cc: Morten Rasmussen Cc: Qais Yousef Cc: Suren Baghdasaryan Cc: Quentin Perret Cc: Tejun Heo Cc: Johannes Weiner Cc: Ingo Molnar Cc: Juri Lelli Cc: Vincent Guittot Cc: "Rafael J. Wysocki" Cc: Dietmar Eggemann Cc: Daniel Bristot de Oliveira Cc: kernel-team@android.com --->8 Will Deacon (22): sched: Favour predetermined active CPU as migration destination arm64: cpuinfo: Split AArch32 registers out into a separate struct arm64: Allow mismatched 32-bit EL0 support KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs arm64: Advertise CPUs capable of running 32-bit applications in sysfs sched: Introduce task_cpu_possible_mask() to limit fallback rq selection cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() sched: Reject CPU affinity changes based on task_cpu_possible_mask() sched: Introduce task_struct::user_cpus_ptr to track requested affinity sched: Split the guts of sched_setaffinity() into a helper function sched: Allow task CPU affinity to be restricted on asymmetric systems sched: Introduce task_cpus_dl_admissible() to check proposed affinity freezer: Add frozen_or_skipped() helper function sched: Defer wakeup in ttwu() for unschedulable frozen tasks arm64: Implement task_cpu_possible_mask() arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Documentation: arm64: describe asymmetric 32-bit support .../ABI/testing/sysfs-devices-system-cpu | 9 + .../admin-guide/kernel-parameters.txt | 11 + Documentation/arm64/asymmetric-32bit.rst | 154 ++++++++ Documentation/arm64/index.rst | 1 + arch/arm64/include/asm/cpu.h | 44 ++- arch/arm64/include/asm/cpufeature.h | 8 +- arch/arm64/include/asm/elf.h | 6 +- arch/arm64/include/asm/mmu_context.h | 13 + arch/arm64/kernel/cpufeature.c | 227 ++++++++--- arch/arm64/kernel/cpuinfo.c | 53 +-- arch/arm64/kernel/process.c | 44 ++- arch/arm64/kvm/arm.c | 11 +- arch/arm64/tools/cpucaps | 3 +- include/linux/cpuset.h | 3 +- include/linux/freezer.h | 6 + include/linux/mmu_context.h | 11 + include/linux/sched.h | 21 ++ init/init_task.c | 1 + kernel/cgroup/cpuset.c | 53 ++- kernel/fork.c | 2 + kernel/freezer.c | 10 +- kernel/hung_task.c | 4 +- kernel/sched/core.c | 351 ++++++++++++++---- kernel/sched/sched.h | 1 + 24 files changed, 850 insertions(+), 197 deletions(-) create mode 100644 Documentation/arm64/asymmetric-32bit.rst