From patchwork Sun Feb 27 12:07:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12761645 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by smtp.subspace.kernel.org (Postfix) with ESMTP id E95C948B7 for ; Sun, 27 Feb 2022 12:09:05 +0000 (UTC) IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23: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 X-IronPort-AV: E=Sophos;i="5.88,333,1635177600"; d="scan'208";a="122037685" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 27 Feb 2022 20:07:51 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id 30F494D169F2; Sun, 27 Feb 2022 20:07:50 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Sun, 27 Feb 2022 20:07:52 +0800 Received: from irides.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; Sun, 27 Feb 2022 20:07:49 +0800 From: Shiyang Ruan To: , , , , CC: , , , , , Christoph Hellwig Subject: [PATCH v11 2/8] mm: factor helpers for memory_failure_dev_pagemap Date: Sun, 27 Feb 2022 20:07:41 +0800 Message-ID: <20220227120747.711169-3-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220227120747.711169-1-ruansy.fnst@fujitsu.com> References: <20220227120747.711169-1-ruansy.fnst@fujitsu.com> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-yoursite-MailScanner-ID: 30F494D169F2.A100C X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Spam-Status: No 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 Reviewed-by: Dan Williams --- 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 14ae5c18e776..98b6144e4b9b 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1500,6 +1500,80 @@ 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 dev_pagemap *pgmap) +{ + 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; + + if (hwpoison_filter(page)) + return 0; + + if (pgmap->type == 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 |= 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); @@ -1576,12 +1650,8 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, struct dev_pagemap *pgmap) { struct page *page = pfn_to_page(pfn); - unsigned long size = 0; - struct to_kill *tk; LIST_HEAD(tokill); - int rc = -EBUSY; - loff_t start; - dax_entry_t cookie; + int rc = -ENXIO; if (flags & MF_COUNT_INCREASED) /* @@ -1590,67 +1660,10 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, put_page(page); /* device metadata space is not recoverable */ - if (!pgmap_pfn_valid(pgmap, pfn)) { - rc = -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 = dax_lock_page(page); - if (!cookie) + if (!pgmap_pfn_valid(pgmap, pfn)) goto out; - if (hwpoison_filter(page)) { - rc = 0; - goto unlock; - } - - if (pgmap->type == 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 |= 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, false, pfn, flags); - rc = 0; -unlock: - dax_unlock_page(page, cookie); + rc = mf_generic_kill_procs(pfn, flags, pgmap); out: /* drop pgmap ref acquired in caller */ put_dev_pagemap(pgmap);