STRUCT CXL_MEMDEV(9)

✨ struct cxl_memdev — Kernel API Manual ✨

💖 NAME 💖

okay so struct cxl_memdev is literally the CXL bus object representing a Type-3 Memory Device — that’s the whole name vibe, bestie. 💅

✨ SYNOPSIS ✨

struct cxl_memdev {
    struct device dev;
    struct cdev cdev;
    struct cxl_dev_state *cxlds;
    struct work_struct detach_work;
    struct cxl_nvdimm_bridge *cxl_nvb;
    struct cxl_nvdimm *cxl_nvd;
    struct cxl_port *endpoint;
    const struct cxl_memdev_attach *attach;
    int id;
    int depth;
    u8 scrub_cycle;
    int scrub_region_id;
    struct cxl_mem_err_rec *err_rec_array;
 };

🧚 Members 🧚

• dev — the driver core device object, iconic.
• cdev — the char dev core object for ioctl operations. yep, ioctl business.
• cxlds — the device state backing this device.
• detach_work — work item for when an active memdev lost a port in its ancestry. 😭
• cxl_nvb — coordinates removal of cxl_nvd if present.
• cxl_nvd — optional bridge to an nvdimm if the device supports pmem.
• endpoint — connection to the CXL port topology for this memory device.
• attach — means the creator of this memdev depends on CXL link attach to operate.
• id — id number of this memdev instance. periodt.
• depth — endpoint port depth.
• scrub_cycle — current scrub cycle set for this device.
• scrub_region_id — id number of a backed region (if any) for which the current scrub cycle is set.
• err_rec_array — list of xarrarys to store the memdev error records, so you can check whether the attributes for a memory repair operation are from the current boot. 🔥

🌈 SEE ALSO 🌈

Kernel file ./drivers/cxl/cxlmem.h — go peek at struct cxl_attach_region(9), struct cxl_event_state(9), struct cxl_poison_state(9), struct cxl_fw_state(9), struct cxl_security_state(9), struct cxl_memdev_state(9), struct cxl_mem_command(9), and struct cxl_hdm(9). 🦋

💖 signed off from source/version ./drivers/cxl, dated October 2026, all about struct cxl_memdev(9) — byeee! 💖