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libnvdimm, pmem: Add sysfs notifications to badblocks 

Sysfs "badblocks" information may be updated during run-time that:
 - MCE, SCI, and sysfs "scrub" may add new bad blocks
 - Writes and ioctl() may clear bad blocks

Add support to send sysfs notifications to sysfs "badblocks" file
under region and pmem directories when their badblocks information
is re-evaluated (but is not necessarily changed) during run-time.

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Linda Knippers <linda.knippers@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Toshi Kani 2017-06-12 16:25:11 -06:00 committed by Dan Williams
parent a117699c6c
commit 975750a98c
5 changed files with 29 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/nvdimm/bus.c
View File

@ -198,6 +198,9 @@ static int nvdimm_clear_badblocks_region(struct device *dev, void *data)
sector = (ctx->phys - nd_region->ndr_start) / 512;
badblocks_clear(&nd_region->bb, sector, ctx->cleared / 512);
if (nd_region->bb_state)
sysfs_notify_dirent(nd_region->bb_state);
return 0;
}

1
drivers/nvdimm/nd.h
View File

@ -161,6 +161,7 @@ struct nd_region {
u64 ndr_start;
int id, num_lanes, ro, numa_node;
void *provider_data;
struct kernfs_node *bb_state;
struct badblocks bb;
struct nd_interleave_set *nd_set;
struct nd_percpu_lane __percpu *lane;

14
drivers/nvdimm/pmem.c
View File

@ -68,6 +68,8 @@ static int pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
(unsigned long long) sector, cleared,
cleared > 1 ? "s" : "");
badblocks_clear(&pmem->bb, sector, cleared);
if (pmem->bb_state)
sysfs_notify_dirent(pmem->bb_state);
}
invalidate_pmem(pmem->virt_addr + offset, len);
@ -378,6 +380,13 @@ static int pmem_attach_disk(struct device *dev,
revalidate_disk(disk);
pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd,
"badblocks");
if (pmem->bb_state)
sysfs_put(pmem->bb_state);
else
dev_warn(dev, "sysfs_get_dirent 'badblocks' failed\n");
return 0;
}
@ -429,6 +438,7 @@ static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
struct nd_namespace_io *nsio;
struct resource res;
struct badblocks *bb;
struct kernfs_node *bb_state;
if (event != NVDIMM_REVALIDATE_POISON)
return;
@ -440,11 +450,13 @@ static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
nd_region = to_nd_region(ndns->dev.parent);
nsio = to_nd_namespace_io(&ndns->dev);
bb = &nsio->bb;
bb_state = NULL;
} else {
struct pmem_device *pmem = dev_get_drvdata(dev);
nd_region = to_region(pmem);
bb = &pmem->bb;
bb_state = pmem->bb_state;
if (is_nd_pfn(dev)) {
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
@ -464,6 +476,8 @@ static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
res.start = nsio->res.start + offset;
res.end = nsio->res.end - end_trunc;
nvdimm_badblocks_populate(nd_region, bb, &res);
if (bb_state)
sysfs_notify_dirent(bb_state);
}
MODULE_ALIAS("pmem");

1
drivers/nvdimm/pmem.h
View File

@ -17,6 +17,7 @@ struct pmem_device {
size_t size;
/* trim size when namespace capacity has been section aligned */
u32 pfn_pad;
struct kernfs_node *bb_state;
struct badblocks bb;
struct dax_device *dax_dev;
struct gendisk *disk;

12
drivers/nvdimm/region.c
View File

@ -58,10 +58,16 @@ static int nd_region_probe(struct device *dev)
if (devm_init_badblocks(dev, &nd_region->bb))
return -ENODEV;
nd_region->bb_state = sysfs_get_dirent(nd_region->dev.kobj.sd,
"badblocks");
if (nd_region->bb_state)
sysfs_put(nd_region->bb_state);
else
dev_warn(&nd_region->dev,
"sysfs_get_dirent 'badblocks' failed\n");
ndr_res.start = nd_region->ndr_start;
ndr_res.end = nd_region->ndr_start + nd_region->ndr_size - 1;
nvdimm_badblocks_populate(nd_region,
&nd_region->bb, &ndr_res);
nvdimm_badblocks_populate(nd_region, &nd_region->bb, &ndr_res);
}
nd_region->btt_seed = nd_btt_create(nd_region);
@ -126,6 +132,8 @@ static void nd_region_notify(struct device *dev, enum nvdimm_event event)
nd_region->ndr_size - 1;
nvdimm_badblocks_populate(nd_region,
&nd_region->bb, &res);
if (nd_region->bb_state)
sysfs_notify_dirent(nd_region->bb_state);
}
}
device_for_each_child(dev, &event, child_notify);