From patchwork Thu Jan 27 12:40:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12726733 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0476B2CAE for ; Thu, 27 Jan 2022 12:41:15 +0000 (UTC) IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:6+OKzqwZVW8khNUkpm59KrPwEL1zdoMgy1knxilNoH1uA6ilfqWV8cjzuiWbtN9vYhsdcLy7WZVoIkmskKKdg7NhXotKNTOO0ASVxepZnOnfKlPbexHWx6p00KdMV+xEAsTsMF4St63HyTj9P9E+4NTvysyVuds= X-IronPort-AV: E=Sophos;i="5.88,320,1635177600"; d="scan'208";a="120913269" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 27 Jan 2022 20:41:07 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id EFDAD4D15A5E; Thu, 27 Jan 2022 20:41:01 +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; Thu, 27 Jan 2022 20:41:02 +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; Thu, 27 Jan 2022 20:40:59 +0800 From: Shiyang Ruan To: , , , , CC: , , , , , Christoph Hellwig Subject: [PATCH v10 3/9] pagemap,pmem: Introduce ->memory_failure() Date: Thu, 27 Jan 2022 20:40:52 +0800 Message-ID: <20220127124058.1172422-4-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220127124058.1172422-1-ruansy.fnst@fujitsu.com> References: <20220127124058.1172422-1-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: EFDAD4D15A5E.A503C 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 Reviewed-by: Dan Williams --- drivers/nvdimm/pmem.c | 16 ++++++++++++++++ include/linux/memremap.h | 12 ++++++++++++ mm/memory-failure.c | 14 ++++++++++++++ 3 files changed, 42 insertions(+) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 58d95242a836..0a6e8698d086 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -366,6 +366,20 @@ 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); + u64 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) { @@ -427,6 +441,7 @@ 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); @@ -440,6 +455,7 @@ 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 1fafcc38acba..f739318b496f 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -77,6 +77,18 @@ 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. + * + * When this is not implemented, or it returns -EOPNOTSUPP, the caller + * will fall back to a common handler called mf_generic_kill_procs(). + */ + 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 98b6144e4b9b..b2d13eba1071 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1663,6 +1663,20 @@ 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 */