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libnvdimm/labels: Introduce the concept of multi-range namespace labels

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The CXL specification defines a mechanism for namespaces to be comprised
of multiple dis-contiguous ranges. Introduce that concept to the legacy
NVDIMM namespace implementation with a new nsl_set_nrange() helper, that
sets the number of ranges to 1. Once the NVDIMM subsystem supports CXL
labels and updates its namespace capacity provisioning for
dis-contiguous support nsl_set_nrange() can be updated, but in the
meantime CXL label validation requires nrange be non-zero.

Reported-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/163116430804.2460985.5482188351381597529.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2021-09-08 22:11:48 -07:00
parent 8172db9252
commit 42e192aa98
2 changed files with 14 additions and 0 deletions
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1
drivers/nvdimm/label.c
View File

@ -856,6 +856,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
nsl_set_name(ndd, nd_label, nspm->alt_name);
nsl_set_flags(ndd, nd_label, flags);
nsl_set_nlabel(ndd, nd_label, nd_region->ndr_mappings);
nsl_set_nrange(ndd, nd_label, 1);
nsl_set_position(ndd, nd_label, pos);
nsl_set_isetcookie(ndd, nd_label, cookie);
nsl_set_rawsize(ndd, nd_label, resource_size(res));

13
drivers/nvdimm/nd.h
View File

@ -164,6 +164,19 @@ static inline void nsl_set_nlabel(struct nvdimm_drvdata *ndd,
nd_label->nlabel = __cpu_to_le16(nlabel);
}
static inline u16 nsl_get_nrange(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
/* EFI labels do not have an nrange field */
return 1;
}
static inline void nsl_set_nrange(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u16 nrange)
{
}
static inline u64 nsl_get_lbasize(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{