From patchwork Sun Dec 26 14:34:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12699344 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by smtp.subspace.kernel.org (Postfix) with ESMTP id BA3A52C9C for ; Sun, 26 Dec 2021 14:35:12 +0000 (UTC) IronPort-Data: A9a23:/hJnKqNUw5ZGA17vrR3alsFynXyQoLVcMsFnjC/WdQS5gT4mhjBSzGUXWG+BPfeKY2f9KI1/a4u39U0F7MLSm99gGjLY11k3ESsS9pCt6fd1j6vIF3rLaJWFFSqL1u1GAjX7BJ1yHi+0SiuFaOC79CAmj//QH9IQNcafUsxPbV49IMseoUI78wIJqtYAbemRW2thi/uryyHsEAPNNwpPD44hw/nrRCWDExjFkGhwUlQWPZintbJF/pUfJMp3yaqZdxMUTmTId9NWSdovzJnhlo/Y1xwrTN24kLfnaVBMSbnXVeSMoiMOHfH83V4Z/Wpvuko4HKN0hUN/kSiAmctgjttLroCYRxorP7HXhaIWVBww/yRWZPQXpeGccSfg2SCU5wicG5f2+N1iBV83MaUW4OFyBntE9OBeIzcIBjiDjOKewbS1UOBgi80vas7xM+s3tnhmizOfEvciRZHKRr7i5NlE0TN2jcdLdd7SZdUebzVHbxnaZRBLfFANB/oWmOaum2m6djhwq0ycrqlx5HLcpCR3zrTsNd/9ft2RWd4Tmkeeu3KA82nnajkaP9y3zSGZtH6h7sfNlCX2HokSCZW/7PdhhFDVzWsWYDUSVF2msby3kUKzRd9bA1Ib9zBorqUo8kGvCN7nUHWQpH+Cow5ZWNdKFeA+wB+Cx7CS4AuDAGUACDlbZ7QOsM4wWCxvxlGSt83mCCYps7CPT3+ZsLCOoluP1YI9RYMZTXZcC1JbvJ+4+8du5i8jh+1LSMad5uAZ0xmtq9xSkBUDug== IronPort-HdrOrdr: A9a23:wEdx5a9jGHwvCcdYNa5uk+DkI+orL9Y04lQ7vn2ZKCYlFvBw8vrCoB1173HJYUkqMk3I9ergBEDiewK4yXcW2/hzAV7KZmCP11dAR7sSj7cKrQeBJwTOssZZ1YpFN5N1EcDMCzFB5vrS0U2VFMkBzbC8nJyVuQ== X-IronPort-AV: E=Sophos;i="5.88,237,1635177600"; d="scan'208";a="119563877" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 26 Dec 2021 22:35:10 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id 99E254D146EE; Sun, 26 Dec 2021 22:35:04 +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; Sun, 26 Dec 2021 22:35:05 +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, 26 Dec 2021 22:35:02 +0800 From: Shiyang Ruan To: , , , , CC: , , , , , Christoph Hellwig Subject: [PATCH v9 04/10] pagemap,pmem: Introduce ->memory_failure() Date: Sun, 26 Dec 2021 22:34:33 +0800 Message-ID: <20211226143439.3985960-5-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211226143439.3985960-1-ruansy.fnst@fujitsu.com> References: <20211226143439.3985960-1-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: 99E254D146EE.A03E9 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Spam-Status: No When memory-failure occurs, we call this function which is implemented by each kind of devices. For the fsdax case, pmem device driver implements it. Pmem device driver will find out the filesystem in which the corrupted page located in. With dax_holder notify support, we are able to notify the memory failure from pmem driver to upper layers. If there is something not support in the notify routine, memory_failure will fall back to the generic hanlder. Signed-off-by: Shiyang Ruan Reviewed-by: Christoph Hellwig --- drivers/nvdimm/pmem.c | 16 ++++++++++++++++ include/linux/memremap.h | 9 +++++++++ mm/memory-failure.c | 14 ++++++++++++++ 3 files changed, 39 insertions(+) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 4190c8c46ca8..2114554358eb 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -386,6 +386,20 @@ static void pmem_release_disk(void *__pmem) blk_cleanup_disk(pmem->disk); } +static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap, + unsigned long pfn, u64 len, int mf_flags) +{ + struct pmem_device *pmem = + container_of(pgmap, struct pmem_device, pgmap); + loff_t offset = PFN_PHYS(pfn) - pmem->phys_addr - pmem->data_offset; + + return dax_holder_notify_failure(pmem->dax_dev, offset, len, mf_flags); +} + +static const struct dev_pagemap_ops fsdax_pagemap_ops = { + .memory_failure = pmem_pagemap_memory_failure, +}; + static int pmem_attach_disk(struct device *dev, struct nd_namespace_common *ndns) { @@ -448,6 +462,7 @@ static int pmem_attach_disk(struct device *dev, pmem->pfn_flags = PFN_DEV; if (is_nd_pfn(dev)) { pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; + pmem->pgmap.ops = &fsdax_pagemap_ops; addr = devm_memremap_pages(dev, &pmem->pgmap); pfn_sb = nd_pfn->pfn_sb; pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); @@ -461,6 +476,7 @@ static int pmem_attach_disk(struct device *dev, pmem->pgmap.range.end = res->end; pmem->pgmap.nr_range = 1; pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; + pmem->pgmap.ops = &fsdax_pagemap_ops; addr = devm_memremap_pages(dev, &pmem->pgmap); pmem->pfn_flags |= PFN_MAP; bb_range = pmem->pgmap.range; diff --git a/include/linux/memremap.h b/include/linux/memremap.h index c0e9d35889e8..820c2f33b163 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -87,6 +87,15 @@ struct dev_pagemap_ops { * the page back to a CPU accessible page. */ vm_fault_t (*migrate_to_ram)(struct vm_fault *vmf); + + /* + * Handle the memory failure happens on a range of pfns. Notify the + * processes who are using these pfns, and try to recover the data on + * them if necessary. The mf_flags is finally passed to the recover + * function through the whole notify routine. + */ + int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn, + u64 len, int mf_flags); }; #define PGMAP_ALTMAP_VALID (1 << 0) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 1ee7d626fed7..3cc612b29f89 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1625,6 +1625,20 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, if (!pgmap_pfn_valid(pgmap, pfn)) goto out; + /* + * Call driver's implementation to handle the memory failure, otherwise + * fall back to generic handler. + */ + if (pgmap->ops->memory_failure) { + rc = pgmap->ops->memory_failure(pgmap, pfn, PAGE_SIZE, flags); + /* + * Fall back to generic handler too if operation is not + * supported inside the driver/device/filesystem. + */ + if (rc != -EOPNOTSUPP) + goto out; + } + rc = mf_generic_kill_procs(pfn, flags, pgmap); out: /* drop pgmap ref acquired in caller */