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libnvdimm/label: Define CXL region labels

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Add a definition of the CXL 2.0 region label format. Note this is done
as a separate patch to make the next patch that adds namespace label
support easier to read.

Reported-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/163116431893.2460985.4003511000574373922.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 22:11:58 -07:00
parent 999c993a85
commit 540ccaa2e4
1 changed files with 32 additions and 0 deletions
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32
drivers/nvdimm/label.h
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@ -66,6 +66,38 @@ struct nd_namespace_index {
u8 free[];
};
/**
* struct cxl_region_label - CXL 2.0 Table 211
* @type: uuid identifying this label format (region)
* @uuid: uuid for the region this label describes
* @flags: NSLABEL_FLAG_UPDATING (all other flags reserved)
* @nlabel: 1 per interleave-way in the region
* @position: this label's position in the set
* @dpa: start address in device-local capacity for this label
* @rawsize: size of this label's contribution to region
* @hpa: mandatory system physical address to map this region
* @slot: slot id of this label in label area
* @ig: interleave granularity (1 << @ig) * 256 bytes
* @align: alignment in SZ_256M blocks
* @reserved: reserved
* @checksum: fletcher64 sum of this label
*/
struct cxl_region_label {
u8 type[NSLABEL_UUID_LEN];
u8 uuid[NSLABEL_UUID_LEN];
__le32 flags;
__le16 nlabel;
__le16 position;
__le64 dpa;
__le64 rawsize;
__le64 hpa;
__le32 slot;
__le32 ig;
__le32 align;
u8 reserved[0xac];
__le64 checksum;
};
/**
* struct nd_namespace_label - namespace superblock
* @uuid: UUID per RFC 4122