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libnvdimm: handle locked label storage areas

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Per the latest version of the "NVDIMM DSM Interface Example" [1], the
label data retrieval routine can report a "locked" status. In this case
all regions associated with that DIMM are disabled until the label area
is unlocked. Provide generic libnvdimm enabling for NVDIMMs with label
data area locking capabilities.

[1]: http://pmem.io/documents/

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2017-05-04 11:47:22 -07:00
parent 8f078b38dd
commit 9d62ed9651
5 changed files with 39 additions and 10 deletions
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17
drivers/nvdimm/namespace_devs.c
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@@ -2236,14 +2236,21 @@ static int init_active_labels(struct nd_region *nd_region)
int count, j;
/*
* If the dimm is disabled then prevent the region from
* being activated if it aliases DPA.
* If the dimm is disabled then we may need to prevent
* the region from being activated.
*/
if (!ndd) {
if (!test_bit(NDD_ALIASING, &nvdimm->flags))
if (test_bit(NDD_LOCKED, &nvdimm->flags))
/* fail, label data may be unreadable */;
else if (test_bit(NDD_ALIASING, &nvdimm->flags))
/* fail, labels needed to disambiguate dpa */;
else
return 0;
dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
dev_name(&nd_mapping->nvdimm->dev));
dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
dev_name(&nd_mapping->nvdimm->dev),
test_bit(NDD_LOCKED, &nvdimm->flags)
? "locked" : "disabled");
return -ENXIO;
}
nd_mapping->ndd = ndd;