STRUCT CXL_REGION_LABEL(9)

💖 struct cxl_region_label(9) — Kernel API Manual 💖

okay bestie, welcome to the kernel API manual page for struct cxl_region_label(9). This is literally the CXL 2.0 Table 211 situation, and we're gonna get into it. No cap. 🫶

🌸 NAME 🌸

struct cxl_region_label — CXL 2.0 Table 211, periodt.

✨ SYNOPSIS ✨

       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;
        };

🎀 Members 🎀

• type — the uuid identifying this label format (region), iykyk 💅
• uuid — the uuid for the region this label describes ✨
• flags — NSLABEL_FLAG_UPDATING is the moment; all other flags are reserved 🚫
• nlabel — 1 per interleave-way in the region, okayyy 👑
• position — this label's position in the set, main character energy 🌟
• dpa — start address in device-local capacity for this label 📍
• rawsize — size of this label's contribution to region, slay 📏
• 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, bestie, don't touch 🙈
• checksum — fletcher64 sum of this label 🧮

🦋 SEE ALSO 🦋

• Kernel file ./drivers/nvdimm/label.h — also peep struct nd_namespace_index(9), struct nvdimm_efi_label(9), struct nvdimm_cxl_label(9), and struct nd_label_id(9) 💜

mwah 💋 — signed off by ./drivers/nvdimm, dated October 2026, starring struct cxl_region_label(9). periodt. 🎀