STRUCT CXL_REGION_REF(9)

💅 struct cxl_region_ref(9) — the Kernel API Manual glow-up 🎀

okay so bestie, you're reading the struct cxl_region_ref(9) page from the Kernel API Manual and honestly? it's giving "one little struct, so much lore." Let's get into it. ✨

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🌸 NAME 🌸

struct cxl_region_ref — literally just tracking a region's interest in a port. that's the whole vibe. a region is 👀 at a port, and this struct is the receipts.

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🦋 SYNOPSIS 🦋

struct cxl_region_ref {
    struct cxl_port *port;
    struct cxl_decoder *decoder;
    struct cxl_region *region;
    struct xarray endpoints;
    int nr_targets_set;
    int nr_eps;
    int nr_targets;
 };

yes, seven members, and we're gonna go through every single one because we don't skip, like, ever. 💅

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👑 Members 👑

• port — the point in topology where we're gonna install this reference. think of it as picking the exact spot to pin the note up 📌
• decoder — the decoder that got assigned for the region in that port, slotted in and everything 💖
• region — the region this reference is actually for. the main character of this struct, no cap ✨
• endpoints — all the cxl_ep references for the region's members beneath the port. the whole friend group, accounted for 🫶
• nr_targets_set — keeps track of how many targets have been programmed during setup. a little progress bar, essentially 📊
• nr_eps — the number of endpoints that live beneath the port. count 'em 🔢
• nr_targets — the number of distinct targets you'd need to reach all nr_eps. yes, "distinct" matters, don't come for me 🎯

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🌈 SEE ALSO 🌈

the whole squad, in the kernel file ./drivers/cxl/cxl.h:

• cxl objects(9)
• struct cxl_decoder(9)
• struct cxl_endpoint_decoder(9)
• struct cxl_switch_decoder(9)
• struct cxl_rd_ops(9)
• struct cxl_root_decoder(9)
• struct cxl_region_params(9)
• struct cxl_region(9)
• struct cxl_port(9)
• struct cxl_root(9)
• struct cxl_dport(9)
• struct cxl_ep(9)
• struct cxl_endpoint_dvsec_info(9)

like, go read them, they're iconic too, iykyk 💜

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okay that's the page!! tysm for reading, you ate that 🍓 this one lives in ./drivers/cxl and the version/date stamp on it is October 2026 — so mark your calendar bestie, see you then 💖🧚‍♀️🔥