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libnvdimm: pmem label sets and namespace instantiation.

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A complete label set is a PMEM-label per-dimm per-interleave-set where
all the UUIDs match and the interleave set cookie matches the hosting
interleave set.

Present sysfs attributes for manipulation of a PMEM-namespace's
'alt_name', 'uuid', and 'size' attributes.  A later patch will make
these settings persistent by writing back the label.

Note that PMEM allocations grow forwards from the start of an interleave
set (lowest dimm-physical-address (DPA)).  BLK-namespaces that alias
with a PMEM interleave set will grow allocations backward from the
highest DPA.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2015-06-17 17:14:46 -04:00
parent 4a826c83db
commit bf9bccc14c
15 changed files with 1506 additions and 31 deletions
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20
drivers/nvdimm/pmem.c
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@@ -203,6 +203,23 @@ static int nd_pmem_probe(struct device *dev)
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
struct pmem_device *pmem;
if (resource_size(&nsio->res) < ND_MIN_NAMESPACE_SIZE) {
resource_size_t size = resource_size(&nsio->res);
dev_dbg(dev, "%s: size: %pa, too small must be at least %#x\n",
__func__, &size, ND_MIN_NAMESPACE_SIZE);
return -ENODEV;
}
if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_PMEM) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
if (!nspm->uuid) {
dev_dbg(dev, "%s: uuid not set\n", __func__);
return -ENODEV;
}
}
pmem = pmem_alloc(dev, &nsio->res, nd_region->id);
if (IS_ERR(pmem))
return PTR_ERR(pmem);
@@ -222,13 +239,14 @@ static int nd_pmem_remove(struct device *dev)
MODULE_ALIAS("pmem");
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
static struct nd_device_driver nd_pmem_driver = {
.probe = nd_pmem_probe,
.remove = nd_pmem_remove,
.drv = {
.name = "nd_pmem",
},
.type = ND_DRIVER_NAMESPACE_IO,
.type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
};
static int __init pmem_init(void)