cxl_switch_decoder_alloc(9)

🌸 cxl_switch_decoder_alloc(9) — Kernel API Manual, bestie edition 🌸

okay so welcome to the Kernel API Manual page for cxl_switch_decoder_alloc — yes the name is a mouthful, no we are not changing it, it's iconic actually 💅

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✨ NAME ✨

cxl_switch_decoder_alloc — allocate a switch level decoder 🎀

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✨ SYNOPSIS ✨

struct cxl_switch_decoder * cxl_switch_decoder_alloc (struct cxl_port
*port , unsigned int nr_targets );

like... that's the whole vibe. two args, one struct pointer back. slay.

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✨ ARGUMENTS ✨

• port — the owning CXL switch port of this decoder 👑 she's the main character, everything hangs off her.
• nr_targets — the max number of dynamically addressable downstream targets. lowkey the ceiling on how many friends this decoder can have fr fr.

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✨ RETURN ✨

You get back a brand new cxl decoder, the kind that's meant to be registered by cxl_decoder_add. 🦋

It also brings a topology and the HDM Decoder Capability along with it — no cap. And heads up bestie, this includes the decoders that sit between Switch Upstream Ports / Switch Downstream Ports and Host Bridges / Root Ports. yes, all of those. the whole friend group 💖

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✨ SEE ALSO ✨

Kernel file ./drivers/cxl/core/port.c 🌈 and honestly the entire cxl cinematic universe:

• 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_endpoint_decoder_alloc(9)
• cxl_decoder_add_locked(9)
• cxl_decoder_add(9)
• __cxl_driver_register(9)
• cxl_endpoint_get_perf_coordinates(9)

like, read them all. iykyk 💜

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and that's the page!! mwah 🫶 this lil cutie lives in ./drivers/cxl/core, dated October 2026, and answers to cxl_switch_decoder_alloc(9) — go off bestie, allocate responsibly ✨🎀💅