cxl_endpoin..._coordinates(9)

💅 cxl_endpoin..._coordinates(9) — the Kernel API Manual page, but make it make sense

okay bestie, so this is a page from the Kernel API Manual, and the name is lowkey a mouthful: it's cxl_endpoin..._coordinates(9) — yes, the title itself gets truncated with ... like the kernel ran out of characters mid-sentence and just said "good enough" 😭 iconic behaviour honestly.

The star of the show is cxl_endpoint_get_perf_coordinates — say it three times fast, I dare you 🫶

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✨ NAME ✨

cxl_endpoint_get_perf_coordinates — it goes and retrieves the performance numbers, and those numbers live inside the dports of a CXL path. That's the whole vibe check: performance data, dports, CXL path. No cap. 🦋

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✨ SYNOPSIS ✨

int cxl_endpoint_get_perf_coordinates (struct cxl_port *port , struct access_coordinate *coord );

literally just hand it a port and somewhere to stash the coordinates, and it returns an int. main character signature energy 👑

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✨ ARGUMENTS ✨

• port — the endpoint cxl_port. like, the port in question. the one you're being nosy about 💅
• coord — the output performance data. this is where the numbers get dropped off, so make sure it's ready to receive 🎀

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✨ RETURN ✨

• errno on failure — aka it did not slay, and it's telling you why 😭
• 0 on success — aka we ate, we devoured, no crumbs 🌸

fr fr, always check that return value. errno is not a decoration.

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✨ SEE ALSO ✨

the kernel file for this one is ./drivers/cxl/core/port.c — go read it, it's giving source of truth 📖✨

and while you're in the CXL cinematic universe, these are all friends of the family:

• cxl core(9)
• devm_cxl_add_port(9)
• devm_cxl_add_dport(9)
• devm_cxl_add_rch_dport(9)
• cxl_add_ep(9)
• find_cxl_port_by_dport(9)
• find_cxl_port_by_uport(9)
• cxl_decoder_init(9)
• cxl_root_decoder_alloc(9)
• cxl_switch_decoder_alloc(9)
• cxl_endpoint_decoder_alloc(9)
• cxl_decoder_add_locked(9)
• cxl_decoder_add(9)
• __cxl_driver_register(9)

that's the whole group chat, no one's getting left on read 💜

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🥺 okay that's the page!! sign-off time: this lil beauty lives under ./drivers/cxl/core, dated October 2026, and it's filed as cxl_endpoin..._coordinates(9) in the Kernel API Manual. mwah, go get those performance coordinates bestie 💖🌈⭐