From patchwork Fri Jan 24 09:30:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 232947 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 A49D9C35242 for ; Fri, 24 Jan 2020 11:24:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7B337206D4 for ; Fri, 24 Jan 2020 11:24:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579865050; bh=6quDXAEcDFWwvkH1NVh1WWRbSlIvzWXMFot7EM9sOwA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kO8Y5BVGqsSI1aNvtujkO5caBDnAzQT6tbP7hYNrwe16JRWTzXP2NT7xrVvhKTiBm WGwiUI1xig0/sXel9YGAdZEbmxrraOwUJSOjiZtjgBv91WqM11SwEafnnLq8853WG9 7qMV47Gkiqw56XzZV/BQA8DB0NxLCh8cnAV+Emz8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391219AbgAXLYJ (ORCPT ); Fri, 24 Jan 2020 06:24:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:37278 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391401AbgAXLYI (ORCPT ); Fri, 24 Jan 2020 06:24:08 -0500 Received: from localhost (ip-213-127-102-57.ip.prioritytelecom.net [213.127.102.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 22BC2206D4; Fri, 24 Jan 2020 11:24:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579865047; bh=6quDXAEcDFWwvkH1NVh1WWRbSlIvzWXMFot7EM9sOwA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Cu1ufpgckEGtYnSImXtgvQxlNjp2owSkd8NlUzqq5Ru7ngCpI6UX1Kykr3hne++DF wcL5aqHPHT4B+xdz/T2HW9awbS2NS+XeOpRGkf7RHNWKNXCahyKxkDnFdKgQbyjD5L FGyGdpOliRdjMLjhRdvEiGuemGJ+OMAY9wcQPar0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nathan Lynch , "Gautham R. Shenoy" , Michael Ellerman , Sasha Levin Subject: [PATCH 4.19 430/639] powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild Date: Fri, 24 Jan 2020 10:30:00 +0100 Message-Id: <20200124093140.873383873@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124093047.008739095@linuxfoundation.org> References: <20200124093047.008739095@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nathan Lynch [ Upstream commit d4aa219a074a5abaf95a756b9f0d190b5c03a945 ] Allow external callers to force the cacheinfo code to release all its references to cache nodes, e.g. before processing device tree updates post-migration, and to rebuild the hierarchy afterward. CPU online/offline must be blocked by callers; enforce this. Fixes: 410bccf97881 ("powerpc/pseries: Partition migration in the kernel") Signed-off-by: Nathan Lynch Reviewed-by: Gautham R. Shenoy Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin --- arch/powerpc/kernel/cacheinfo.c | 21 +++++++++++++++++++++ arch/powerpc/kernel/cacheinfo.h | 4 ++++ 2 files changed, 25 insertions(+) diff --git a/arch/powerpc/kernel/cacheinfo.c b/arch/powerpc/kernel/cacheinfo.c index a8f20e5928e13..9edb454301336 100644 --- a/arch/powerpc/kernel/cacheinfo.c +++ b/arch/powerpc/kernel/cacheinfo.c @@ -865,4 +865,25 @@ void cacheinfo_cpu_offline(unsigned int cpu_id) if (cache) cache_cpu_clear(cache, cpu_id); } + +void cacheinfo_teardown(void) +{ + unsigned int cpu; + + lockdep_assert_cpus_held(); + + for_each_online_cpu(cpu) + cacheinfo_cpu_offline(cpu); +} + +void cacheinfo_rebuild(void) +{ + unsigned int cpu; + + lockdep_assert_cpus_held(); + + for_each_online_cpu(cpu) + cacheinfo_cpu_online(cpu); +} + #endif /* (CONFIG_PPC_PSERIES && CONFIG_SUSPEND) || CONFIG_HOTPLUG_CPU */ diff --git a/arch/powerpc/kernel/cacheinfo.h b/arch/powerpc/kernel/cacheinfo.h index 955f5e999f1b8..52bd3fc6642da 100644 --- a/arch/powerpc/kernel/cacheinfo.h +++ b/arch/powerpc/kernel/cacheinfo.h @@ -6,4 +6,8 @@ extern void cacheinfo_cpu_online(unsigned int cpu_id); extern void cacheinfo_cpu_offline(unsigned int cpu_id); +/* Allow migration/suspend to tear down and rebuild the hierarchy. */ +extern void cacheinfo_teardown(void); +extern void cacheinfo_rebuild(void); + #endif /* _PPC_CACHEINFO_H */