[PATCH v5 4/9] pmem,mm: Implement ->memory_failure in pmem driver
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STALE1906d
From: Shiyang Ruan <hidden>
Date: 2021-06-28 00:03:15
Also in:
dm-devel, linux-fsdevel, linux-xfs, lkml, nvdimm
Subsystem:
hwpoison memory failure handling, libnvdimm pmem: persistent memory driver, libnvdimm: non-volatile memory device subsystem, memory management, the rest · Maintainers:
Miaohe Lin, Dan Williams, Vishal Verma, Dave Jiang, Alison Schofield, Andrew Morton, Linus Torvalds
Revision v5 of 11 in this series.
Revisions (11)
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 <redacted> --- drivers/nvdimm/pmem.c | 13 +++++++++++++ mm/memory-failure.c | 14 ++++++++++++++ 2 files changed, 27 insertions(+)
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index ed10a8b66068..95d79dfb2fc2 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c@@ -364,9 +364,22 @@ static void pmem_release_disk(void *__pmem) put_disk(pmem->disk); } +static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap, + unsigned long pfn, unsigned long nr_pfns, int 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, + page_size(pfn_to_page(pfn)) * nr_pfns, + &flags); +} + static const struct dev_pagemap_ops fsdax_pagemap_ops = { .kill = pmem_pagemap_kill, .cleanup = pmem_pagemap_cleanup, + .memory_failure = pmem_pagemap_memory_failure, }; static int pmem_attach_disk(struct device *dev,
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 068753911946..30ce1e653c0a 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c@@ -1411,6 +1411,20 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, */ SetPageHWPoison(page); + /* + * 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; + } + mf_generic_kill_procs(pfn, flags); out: /* drop pgmap ref acquired in caller */ --
2.32.0