cxl_decoder_init(9)

🌸 cxl_decoder_init — the Kernel API Manual, bestie edition 🌸

okay so this is a page from the Kernel API Manual and it's literally about cxl_decoder_init, which is the common decoder setup / initialization vibe check. yes we're doing CXL today, drink some water first 💖

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✨ NAME ✨

cxl_decoder_init — common decoder setup / initialization. that's it, that's the whole name, no cap 🎀

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🦋 SYNOPSIS 🦋

int cxl_decoder_init (struct cxl_port *port , struct cxl_decoder *cxld );

look at her. two args, one int return, absolute main character energy 👑

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💅 ARGUMENTS 💅

• port — the owning port of this decoder, aka the decoder's home base 🏠
• cxld — the common decoder properties that get initialized, the actual glow-up target ✨

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🌈 DESCRIPTION 🌈

so a port may contain one or more decoders. not just one, like, one or more, she's flexible 💁‍♀️ and each of those decoders enables some address space for CXL.mem utilization — that's the whole point, giving CXL.mem somewhere to live.

and here's the part where you gotta pay attention: a decoder is expected to be configured by the caller before registering via cxl_decoder_add. so like, do your setup first, then register. not the other way around. order matters, iykyk 🙈

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🔥 SEE ALSO 🔥

the kernel file ./drivers/cxl/core/port.c, and then this whole friend group:

• 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_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)
• cxl_endpoint_get_perf_coordinates(9)

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heads up bestie: configure cxld before you hit cxl_decoder_add. the page says the caller is expected to do it, so that's on you 🫶

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and that's the page!! 🎀 sourced from ./drivers/cxl/core, dated October 2026, live from the Kernel API Manual — mwah, go configure some decoders, you're gonna slay 💜⭐🍓