From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
To: <linux-kernel@vger.kernel.org>, <linux-xfs@vger.kernel.org>,
<nvdimm@lists.linux.dev>, <linux-mm@kvack.org>,
<linux-fsdevel@vger.kernel.org>
Cc: <djwong@kernel.org>, <dan.j.williams@intel.com>,
<david@fromorbit.com>, <hch@infradead.org>, <jane.chu@oracle.com>,
<rgoldwyn@suse.de>, <viro@zeniv.linux.org.uk>,
<willy@infradead.org>, <naoya.horiguchi@nec.com>,
<linmiaohe@huawei.com>, Christoph Hellwig <hch@lst.de>
Subject: [PATCH v14 03/07] pagemap,pmem: Introduce ->memory_failure()
Date: Sun, 8 May 2022 22:36:09 +0800 [thread overview]
Message-ID: <20220508143620.1775214-4-ruansy.fnst@fujitsu.com> (raw)
In-Reply-To: <20220508143620.1775214-1-ruansy.fnst@fujitsu.com>
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 <ruansy.fnst@fujitsu.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
---
drivers/nvdimm/pmem.c | 17 +++++++++++++++++
include/linux/memremap.h | 12 ++++++++++++
mm/memory-failure.c | 14 ++++++++++++++
3 files changed, 43 insertions(+)
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 58d95242a836..bd502957cfdf 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -366,6 +366,21 @@ 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, unsigned long nr_pages, 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;
+ u64 len = nr_pages << PAGE_SHIFT;
+
+ 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 +442,7 @@ 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 +456,7 @@ 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 8af304f6b504..f1d413ef7c0d 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -79,6 +79,18 @@ 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,
+ unsigned long nr_pages, int mf_flags);
};
#define PGMAP_ALTMAP_VALID (1 << 0)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 9e4728103c0d..aeb19593af9c 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1740,6 +1740,20 @@ 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, 1, 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 */
--
2.35.1
next prev parent reply other threads:[~2022-05-08 14:37 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-08 14:36 [PATCHSETS] v14 fsdax-rmap + v11 fsdax-reflink Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 01/07] dax: Introduce holder for dax_device Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 02/07] mm: factor helpers for memory_failure_dev_pagemap Shiyang Ruan
2022-05-08 14:36 ` Shiyang Ruan [this message]
2022-05-08 14:36 ` [PATCH v14 04/07] fsdax: Introduce dax_lock_mapping_entry() Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 05/07] mm: Introduce mf_dax_kill_procs() for fsdax case Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 06/07] xfs: Implement ->notify_failure() for XFS Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 07/07] fsdax: set a CoW flag when associate reflink mappings Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 01/07] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 02/07] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 03/07] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 04/07] fsdax: Add dax_iomap_cow_copy() for dax zero Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 05/07] fsdax: Dedup file range to use a compare function Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 06/07] xfs: support CoW in fsdax mode Shiyang Ruan
2022-05-10 5:45 ` Christoph Hellwig
2022-05-10 10:06 ` Shiyang Ruan
2022-05-11 2:25 ` [PATCH v11.1 " Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 07/07] xfs: Add dax dedupe support Shiyang Ruan
2022-05-10 9:32 ` [PATCHSETS] v14 fsdax-rmap + v11 fsdax-reflink Christoph Hellwig
2022-05-11 0:03 ` Darrick J. Wong
2022-05-11 1:48 ` Dave Chinner
2022-05-11 1:55 ` Dan Williams
2022-05-11 2:19 ` Dave Chinner
2022-05-11 2:28 ` Andrew Morton
2022-05-11 2:43 ` Darrick J. Wong
2022-05-11 5:24 ` Andrew Morton
2022-05-11 6:21 ` Dave Chinner
2022-05-11 15:19 ` Darrick J. Wong
2022-05-11 15:46 ` Dan Williams
2022-05-12 12:27 ` Shiyang Ruan
2022-06-02 9:42 ` Shiyang Ruan
2022-06-02 17:18 ` Darrick J. Wong
2022-06-02 17:47 ` Andrew Morton
2022-05-11 4:20 ` Dan Williams
2022-05-11 4:34 ` Darrick J. Wong
2022-06-02 18:56 ` Andrew Morton
2022-06-03 1:07 ` Shiyang Ruan
2022-06-03 1:36 ` Shiyang Ruan
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