hvcs_register_connection(9)

🌸 hvcs_register_connection(9) — the Kernel API Manual era 🌸

okay so bestie, we're in the Kernel API Manual (that's the manual name, iykyk) and today's main character is hvcs_register_connection — it's giving "let's make these two adapters finally meet" energy. 💅

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✨ NAME ✨

hvcs_register_connection — establish a connection between this vty-server and a vty. literally matchmaking, but for hardware. 🫶

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✨ SYNOPSIS ✨

int hvcs_register_connection (uint32_t unit_address , uint32_t
p_partition_ID , uint32_t p_unit_address );

three uint32_ts and a dream, no cap. ✨

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✨ ARGUMENTS ✨

• unit_address — the unit address of the vty-server adapter that is to be establish a connection. yes she's the one doing the connecting, the social butterfly of the pair 🦋
• p_partition_ID — the partition ID of the vty adapter that is to be connected. gotta know which partition your new bestie lives in 💖
• p_unit_address — the unit address of the vty adapter to which the vty-server is to be connected. the actual address of the adapter getting connected to, periodt.

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✨ DESCRIPTION ✨

okay so here's the tea, and it's kind of a whole saga 😭

If this function is called once and -EINVAL is returned, it may indicate that the partner info needs to be refreshed for the target unit address — at which point the caller must invoke hvcs_get_partner_info and then call this function again. like, go get the updated intel and try again, babe. 🔥

If, for a second time, -EINVAL is returned, then it indicates that there is probably already a partner connection registered to a different vty-server adapter. someone else already claimed them. 💀

It's also possible that a second -EINVAL may indicate that one of the parms is not valid — for instance if the link was removed between the vty-server adapter and the vty adapter that you are trying to open. the connection ghosted you fr fr. 🙈

and like… don't shoot the messenger. Firmware implemented it this way. not me, not you, it's just how firmware chose to be. 😭

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✨ SEE ALSO ✨

• Kernel file ./arch/powerpc/platforms/pseries/hvcserver.c — the source, go read it bestie 👑
• hvcs_free_partner_info(9)
• hvcs_get_partner_info(9)
• hvcs_free_connection(9)

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and that's the whole page!! 🌈 this little icon was brought to you by ./arch/powerpc/platforms/pseries and dated October 2026 — mwah, slay, go connect some adapters 💜🎀