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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 33D2DC433F5 for ; Thu, 2 Dec 2021 08:50:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 47C4C6B0075; Thu, 2 Dec 2021 03:49:22 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 404816B007B; Thu, 2 Dec 2021 03:49:22 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 27E316B007D; Thu, 2 Dec 2021 03:49:22 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0084.hostedemail.com [216.40.44.84]) by kanga.kvack.org (Postfix) with ESMTP id 156826B0075 for ; Thu, 2 Dec 2021 03:49:22 -0500 (EST) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id C03DC8A3CA for ; Thu, 2 Dec 2021 08:49:11 +0000 (UTC) X-FDA: 78872229702.15.A4BBCEF Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf07.hostedemail.com (Postfix) with ESMTP id 73B42100009E for ; Thu, 2 Dec 2021 08:49:10 +0000 (UTC) IronPort-Data: =?us-ascii?q?A9a23=3ABSmbaav0vhXQaC/4pzhXpuL+cefnVClfMUV32f8?= =?us-ascii?q?akzHdYEJGY0x3y2tNXWHTOPmJYjP1Ld5yYNuy80wOupODydBiHQE9+y9gHilAw?= =?us-ascii?q?SbnLY7Hdx+vZUt+DSFioHpPtpxYMp+ZRCwNZie0SiyFb/6x8hGQ6YnSHuClUbS?= =?us-ascii?q?cYHgoLeNZYHxJZSxLyrdRbrFA0YDR7zOl4bsekuWHULOX82cc3lE8t8pvnChSU?= =?us-ascii?q?MHa41v0iLCRicdj5zcyn1FNZH4WyDrYw3HQGuG4FcbiLwrPIS3Qw4/Xw/stIov?= =?us-ascii?q?NfrfTeUtMTKPQPBSVlzxdXK3Kbhpq/3R0i/hkcqFHLxo/ZzahxridzP1XqJW2U?= =?us-ascii?q?hZvMKvXhMwTThtZDzpje6ZB/dcrJFDm6JzIlhyfKyaEL/JGSRte0Zcj0up+H2B?= =?us-ascii?q?C3fICLzUKdBqCm6S9x7fTYulnhuwiKsfxNY8Ss30myivWZd4qSJaFQePV5Ntc3?= =?us-ascii?q?T41nehPG+rTY4wSbj8HRBjCfBpJNX8UBYg4kePugWPwGxVcqVSIte8y5kDQ0gV?= =?us-ascii?q?60/7qKtW9UtqUScRQm26cp3na5CL9AxcHJJqTxCTt2nKnhsfLhj+9VI96PL+x8?= =?us-ascii?q?PMsi12O7msJARYSWB2wpvzRokq/Xc9PbkIP9icwoKwa6kOmVJ/+Uge+rXrCuQQ?= =?us-ascii?q?TM/JUEusn+ESOx7DS7gKxGGcJVHhCZcYguctwQiYlvneNntX0FXl/vqa9V32Q7?= =?us-ascii?q?PGXoCm0NCxTKnUNDRLo5yNtD8LL+dl110yQCI04VvPdszE8IhmoqxjikcT0r+l?= =?us-ascii?q?7YRY36piG?= IronPort-HdrOrdr: =?us-ascii?q?A9a23=3AEK1hoajNiTqo1cM48Klze3JCUXBQXuYji2hC?= =?us-ascii?q?6mlwRA09TyX4rbHLoB1/73LJYVkqNk3I5urrBEDtexLhHP1OkOws1NWZLWrbUQ?= =?us-ascii?q?KTRekM0WKI+UyDJ8SRzI5g/JYlW61/Jfm1NlJikPv9iTPSL/8QhPWB74Ck7N2z?= =?us-ascii?q?80tQ?= X-IronPort-AV: E=Sophos;i="5.87,281,1631548800"; d="scan'208";a="118319105" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 02 Dec 2021 16:49:04 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id EFD9A4D13A1E; Thu, 2 Dec 2021 16:49:02 +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; Thu, 2 Dec 2021 16:49:04 +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; Thu, 2 Dec 2021 16:49:00 +0800 From: Shiyang Ruan To: , , , , CC: , , , , , Christoph Hellwig Subject: [PATCH v8 3/9] mm: factor helpers for memory_failure_dev_pagemap Date: Thu, 2 Dec 2021 16:48:50 +0800 Message-ID: <20211202084856.1285285-4-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211202084856.1285285-1-ruansy.fnst@fujitsu.com> References: <20211202084856.1285285-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain X-yoursite-MailScanner-ID: EFD9A4D13A1E.A4710 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 73B42100009E X-Stat-Signature: dsxyean175fynworur8top6m9rupmg48 Authentication-Results: imf07.hostedemail.com; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=fujitsu.com (policy=none); spf=none (imf07.hostedemail.com: domain of ruansy.fnst@fujitsu.com has no SPF policy when checking 183.91.158.132) smtp.mailfrom=ruansy.fnst@fujitsu.com X-HE-Tag: 1638434950-237039 Content-Transfer-Encoding: quoted-printable 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 Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- mm/memory-failure.c | 141 ++++++++++++++++++++++++-------------------- 1 file changed, 77 insertions(+), 64 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 07c875fdeaf0..1ee7d626fed7 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1449,6 +1449,80 @@ static int try_to_split_thp_page(struct page *page= , const char *msg) return 0; } =20 +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 =3D 0; + + list_for_each_entry(tk, to_kill, nd) + if (tk->size_shift) + size =3D 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 =3D (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 dev_pagemap *pgmap) +{ + struct page *page =3D 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 =3D dax_lock_page(page); + if (!cookie) + return -EBUSY; + + if (hwpoison_filter(page)) + return 0; + + if (pgmap->type =3D=3D MEMORY_DEVICE_PRIVATE) { + /* + * TODO: Handle HMM pages which may need coordination + * with device-side memory. + */ + return -EBUSY; + } + + /* + * Use this flag as an indication that the dax page has been + * remapped UC to prevent speculative consumption of poison. + */ + 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 |=3D 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 =3D pfn_to_page(pfn); @@ -1538,12 +1612,8 @@ static int memory_failure_dev_pagemap(unsigned lon= g pfn, int flags, struct dev_pagemap *pgmap) { struct page *page =3D pfn_to_page(pfn); - unsigned long size =3D 0; - struct to_kill *tk; LIST_HEAD(tokill); - int rc =3D -EBUSY; - loff_t start; - dax_entry_t cookie; + int rc =3D -ENXIO; =20 if (flags & MF_COUNT_INCREASED) /* @@ -1552,67 +1622,10 @@ static int memory_failure_dev_pagemap(unsigned lo= ng pfn, int flags, put_page(page); =20 /* device metadata space is not recoverable */ - if (!pgmap_pfn_valid(pgmap, pfn)) { - rc =3D -ENXIO; - 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 =3D dax_lock_page(page); - if (!cookie) + if (!pgmap_pfn_valid(pgmap, pfn)) goto out; =20 - if (hwpoison_filter(page)) { - rc =3D 0; - goto unlock; - } - - if (pgmap->type =3D=3D MEMORY_DEVICE_PRIVATE) { - /* - * TODO: Handle HMM pages which may need coordination - * with device-side memory. - */ - goto unlock; - } - - /* - * Use this flag as an indication that the dax page has been - * remapped UC to prevent speculative consumption of poison. - */ - 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 |=3D 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 =3D 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 =3D (page->index << PAGE_SHIFT) & ~(size - 1); - unmap_mapping_range(page->mapping, start, size, 0); - } - kill_procs(&tokill, flags & MF_MUST_KILL, false, pfn, flags); - rc =3D 0; -unlock: - dax_unlock_page(page, cookie); + rc =3D mf_generic_kill_procs(pfn, flags, pgmap); out: /* drop pgmap ref acquired in caller */ put_dev_pagemap(pgmap); --=20 2.34.0