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libnvdimm/labels: Introduce CXL labels

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Now that all of use sites of label data have been converted to nsl_*
helpers, introduce the CXL label format. The ->cxl flag in
nvdimm_drvdata indicates the label format the device expects. A
follow-on patch allows a bus provider to select the label style.

Note that the EFI definition of the labels represents the Linux "claim
class" with a GUID. The CXL definition of the labels stores the same
identifier in UUID byte order.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/163116432405.2460985.5547867384570123403.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 22:12:04 -07:00
parent 540ccaa2e4
commit 5af96835e4
3 changed files with 241 additions and 50 deletions
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52
drivers/nvdimm/label.h
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@@ -99,7 +99,7 @@ struct cxl_region_label {
};
/**
* struct nd_namespace_label - namespace superblock
* struct nvdimm_efi_label - namespace superblock
* @uuid: UUID per RFC 4122
* @name: optional name (NULL-terminated)
* @flags: see NSLABEL_FLAG_*
@@ -117,7 +117,7 @@ struct cxl_region_label {
* @reserved2: reserved
* @checksum: fletcher64 sum of this object
*/
struct nd_namespace_label {
struct nvdimm_efi_label {
u8 uuid[NSLABEL_UUID_LEN];
u8 name[NSLABEL_NAME_LEN];
__le32 flags;
@@ -130,7 +130,7 @@ struct nd_namespace_label {
__le32 slot;
/*
* Accessing fields past this point should be gated by a
* namespace_label_has() check.
* efi_namespace_label_has() check.
*/
u8 align;
u8 reserved[3];
@@ -140,11 +140,57 @@ struct nd_namespace_label {
__le64 checksum;
};
/**
* struct nvdimm_cxl_label - CXL 2.0 Table 212
* @type: uuid identifying this label format (namespace)
* @uuid: uuid for the namespace this label describes
* @name: friendly name for the namespace
* @flags: NSLABEL_FLAG_UPDATING (all other flags reserved)
* @nrange: discontiguous namespace support
* @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 namespace
* @slot: slot id of this label in label area
* @align: alignment in SZ_256M blocks
* @region_uuid: host interleave set identifier
* @abstraction_uuid: personality driver for this namespace
* @lbasize: address geometry for disk-like personalities
* @reserved: reserved
* @checksum: fletcher64 sum of this label
*/
struct nvdimm_cxl_label {
u8 type[NSLABEL_UUID_LEN];
u8 uuid[NSLABEL_UUID_LEN];
u8 name[NSLABEL_NAME_LEN];
__le32 flags;
__le16 nrange;
__le16 position;
__le64 dpa;
__le64 rawsize;
__le32 slot;
__le32 align;
u8 region_uuid[16];
u8 abstraction_uuid[16];
__le16 lbasize;
u8 reserved[0x56];
__le64 checksum;
};
struct nd_namespace_label {
union {
struct nvdimm_cxl_label cxl;
struct nvdimm_efi_label efi;
};
};
#define NVDIMM_BTT_GUID "8aed63a2-29a2-4c66-8b12-f05d15d3922a"
#define NVDIMM_BTT2_GUID "18633bfc-1735-4217-8ac9-17239282d3f8"
#define NVDIMM_PFN_GUID "266400ba-fb9f-4677-bcb0-968f11d0d225"
#define NVDIMM_DAX_GUID "97a86d9c-3cdd-4eda-986f-5068b4f80088"
#define CXL_REGION_UUID "529d7c61-da07-47c4-a93f-ecdf2c06f444"
#define CXL_NAMESPACE_UUID "68bb2c0a-5a77-4937-9f85-3caf41a0f93c"
/**
* struct nd_label_id - identifier string for dpa allocation
* @id: "{blk|pmem}-<namespace uuid>"