From mboxrd@z Thu Jan 1 00:00:00 1970 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 D0417C2D0DB for ; Tue, 28 Jan 2020 14:11:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A3FE920678 for ; Tue, 28 Jan 2020 14:11:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220683; bh=a3b8GTGMrmfY7nhd+ivfJZYIfMPdm75bJRxBWlYuFWQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=wTxf+VEy7xnPCmU30N8kfjikiief6E7oNoIh6zOddTBIqJ+hZdvZjS3hoY0nwBFy3 zp0no1ZJGa+2dqufoG1CQM2GUuXKpjNF469vW/mqLjVzoUA+SjPYJbS8Dmj9qRSkh9 Olv4GWuerEwi3tYNdekKwUrceeC0eCpTiHepcloE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727874AbgA1OLW (ORCPT ); Tue, 28 Jan 2020 09:11:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:60406 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727659AbgA1OLR (ORCPT ); Tue, 28 Jan 2020 09:11:17 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 887012468E; Tue, 28 Jan 2020 14:11:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220677; bh=a3b8GTGMrmfY7nhd+ivfJZYIfMPdm75bJRxBWlYuFWQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YTYPRN2LMi7IiWYHnfjpbNo+CgR/kMl//NKShmX5g9pKzrVRlBn0o/5wuvyGw3BP7 PX+qQ/jAm8ruUNal9lfEC/y+4nx4v4wDMwQf2r6Bw8BgxFFoIlR6aNW+843Yjj1KWG TsKtSo2WgFHYztGplg8vFjca8rAj0CLEatSW0baA= 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 4.4 101/183] powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild Date: Tue, 28 Jan 2020 15:05:20 +0100 Message-Id: <20200128135840.116104290@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200128135829.486060649@linuxfoundation.org> References: <20200128135829.486060649@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 c641983bbdd68..0122d5ce0637d 100644 --- a/arch/powerpc/kernel/cacheinfo.c +++ b/arch/powerpc/kernel/cacheinfo.c @@ -867,4 +867,25 @@ 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 a7b74d36acd71..2cdee87a482c5 100644 --- a/arch/powerpc/kernel/cacheinfo.h +++ b/arch/powerpc/kernel/cacheinfo.h @@ -5,4 +5,8 @@ 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 */ -- 2.20.1