From patchwork Fri Jul 30 08:52:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12410765 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 1313AC432BE for ; Fri, 30 Jul 2021 08:53:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A15A361008 for ; Fri, 30 Jul 2021 08:53:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A15A361008 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=fujitsu.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 49F5F8D0002; Fri, 30 Jul 2021 04:53:09 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4500E8E0001; Fri, 30 Jul 2021 04:53:09 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2A2148D0005; Fri, 30 Jul 2021 04:53:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0077.hostedemail.com [216.40.44.77]) by kanga.kvack.org (Postfix) with ESMTP id 0F7118D0002 for ; Fri, 30 Jul 2021 04:53:09 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id A779B274A3 for ; Fri, 30 Jul 2021 08:53:08 +0000 (UTC) X-FDA: 78418639656.20.2B1347A Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf14.hostedemail.com (Postfix) with ESMTP id C7291600F2EF for ; Fri, 30 Jul 2021 08:53:07 +0000 (UTC) IronPort-HdrOrdr: A9a23:Qu22SKF0hAUbXW//pLqE1MeALOsnbusQ8zAXPiFKOHhom6mj+vxG88506faKslwssR0b+OxoW5PwJE80l6QFgrX5VI3KNGbbUQCTXeNfBOXZowHIKmnX8+5x8eNaebFiNduYNzNHpPe/zA6mM9tI+rW6zJw= X-IronPort-AV: E=Sophos;i="5.84,281,1620662400"; d="scan'208";a="112070584" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 30 Jul 2021 16:53:05 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id 6485B4D0D4A1; Fri, 30 Jul 2021 16:53:02 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 30 Jul 2021 16:53:04 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 30 Jul 2021 16:53:01 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , Subject: [PATCH v6 3/9] mm: factor helpers for memory_failure_dev_pagemap Date: Fri, 30 Jul 2021 16:52:39 +0800 Message-ID: <20210730085245.3069812-4-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210730085245.3069812-1-ruansy.fnst@fujitsu.com> References: <20210730085245.3069812-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 6485B4D0D4A1.AF624 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: C7291600F2EF Authentication-Results: imf14.hostedemail.com; dkim=none; spf=none (imf14.hostedemail.com: domain of ruansy.fnst@fujitsu.com has no SPF policy when checking 183.91.158.132) smtp.mailfrom=ruansy.fnst@fujitsu.com; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=fujitsu.com (policy=none) X-Stat-Signature: a3mwdaedx87rwaacdkfoq3q8e4iqzspm X-HE-Tag: 1627635187-553885 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: memory_failure_dev_pagemap code is a bit complex before introduce RMAP feature for fsdax. So it is needed to factor some helper functions to simplify these code. Signed-off-by: Shiyang Ruan --- mm/memory-failure.c | 101 +++++++++++++++++++++++++------------------- 1 file changed, 57 insertions(+), 44 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index eefd823deb67..3bdfcb45f66e 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1423,6 +1423,60 @@ static int try_to_split_thp_page(struct page *page, const char *msg) return 0; } +static void unmap_and_kill(struct list_head *to_kill, unsigned long pfn, + struct address_space *mapping, pgoff_t index, int flags) +{ + struct to_kill *tk; + unsigned long size = 0; + + list_for_each_entry(tk, to_kill, nd) + if (tk->size_shift) + size = max(size, 1UL << tk->size_shift); + if (size) { + /* + * Unmap the largest mapping to avoid breaking up device-dax + * mappings which are constant size. The actual size of the + * mapping being torn down is communicated in siginfo, see + * kill_proc() + */ + loff_t start = (index << PAGE_SHIFT) & ~(size - 1); + + unmap_mapping_range(mapping, start, size, 0); + } + + kill_procs(to_kill, flags & MF_MUST_KILL, false, pfn, flags); +} + +static int mf_generic_kill_procs(unsigned long long pfn, int flags) +{ + struct page *page = pfn_to_page(pfn); + LIST_HEAD(to_kill); + dax_entry_t cookie; + + /* + * Prevent the inode from being freed while we are interrogating + * the address_space, typically this would be handled by + * lock_page(), but dax pages do not use the page lock. This + * also prevents changes to the mapping of this pfn until + * poison signaling is complete. + */ + cookie = dax_lock_page(page); + if (!cookie) + return -EBUSY; + /* + * Unlike System-RAM there is no possibility to swap in a + * different physical page at a given virtual address, so all + * userspace consumption of ZONE_DEVICE memory necessitates + * SIGBUS (i.e. MF_MUST_KILL) + */ + flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; + collect_procs(page, &to_kill, true); + + unmap_and_kill(&to_kill, pfn, page->mapping, page->index, flags); + dax_unlock_page(page, cookie); + return 0; +} + static int memory_failure_hugetlb(unsigned long pfn, int flags) { struct page *p = pfn_to_page(pfn); @@ -1512,13 +1566,8 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, struct dev_pagemap *pgmap) { struct page *page = pfn_to_page(pfn); - const bool unmap_success = true; - unsigned long size = 0; - struct to_kill *tk; LIST_HEAD(tokill); int rc = -EBUSY; - loff_t start; - dax_entry_t cookie; if (flags & MF_COUNT_INCREASED) /* @@ -1532,20 +1581,9 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, goto out; } - /* - * Prevent the inode from being freed while we are interrogating - * the address_space, typically this would be handled by - * lock_page(), but dax pages do not use the page lock. This - * also prevents changes to the mapping of this pfn until - * poison signaling is complete. - */ - cookie = dax_lock_page(page); - if (!cookie) - goto out; - if (hwpoison_filter(page)) { rc = 0; - goto unlock; + goto out; } if (pgmap->type == MEMORY_DEVICE_PRIVATE) { @@ -1553,7 +1591,7 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, * TODO: Handle HMM pages which may need coordination * with device-side memory. */ - goto unlock; + goto out; } /* @@ -1562,32 +1600,7 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, */ SetPageHWPoison(page); - /* - * Unlike System-RAM there is no possibility to swap in a - * different physical page at a given virtual address, so all - * userspace consumption of ZONE_DEVICE memory necessitates - * SIGBUS (i.e. MF_MUST_KILL) - */ - flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; - collect_procs(page, &tokill, flags & MF_ACTION_REQUIRED); - - list_for_each_entry(tk, &tokill, nd) - if (tk->size_shift) - size = max(size, 1UL << tk->size_shift); - if (size) { - /* - * Unmap the largest mapping to avoid breaking up - * device-dax mappings which are constant size. The - * actual size of the mapping being torn down is - * communicated in siginfo, see kill_proc() - */ - start = (page->index << PAGE_SHIFT) & ~(size - 1); - unmap_mapping_range(page->mapping, start, size, 0); - } - kill_procs(&tokill, flags & MF_MUST_KILL, !unmap_success, pfn, flags); - rc = 0; -unlock: - dax_unlock_page(page, cookie); + mf_generic_kill_procs(pfn, flags); out: /* drop pgmap ref acquired in caller */ put_dev_pagemap(pgmap);