ibmvmc_ioctl(9)

💅 ibmvmc_ioctl — IOCTL, bestie

okay so picture this: it's a page from the Kernel API Manual, section 9, and the whole entire vibe is ibmvmc_ioctl. that's it. that's the name. no cap, the NAME section is literally just "IOCTL" and honestly? iconic minimalism. slay.

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✨ SYNOPSIS ✨

long ibmvmc_ioctl (struct file *file , unsigned int cmd , unsigned long
arg );

look at her 🫶 she takes three things and returns a long. that's the whole story.

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🎀 ARGUMENTS 🎀

• file — the file information 💖 like, the file's whole deal, passed in as a struct file *.
• cmd — the cmd field. yes bestie, that's the ioctl command itself, the thing that tells her what to do 🌸
• arg — the Argument field. the extra lil passenger that rides along with the command 🦋

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⭐ RETURN ⭐

• 0 — Success ✨ we ate, we devoured, no crumbs.
• Non-zero — Failure 💀 something went sideways, sorry babe.

fr fr that's the entire documented return contract. zero means slay, anything else means 😭.

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🌈 SEE ALSO 🌈

okay this is the part where she name-drops literally everyone in the friend group. strap in 🧚

Kernel file ./drivers/misc/ibmvmc.c and then the whole cast, in this exact order:

h_request_vmc(9), ibmvmc_handle_event(9), ibmvmc_release_crq_queue(9), ibmvmc_reset_crq_queue(9), crq_queue_next_crq(9), ibmvmc_send_crq(9), alloc_dma_buffer(9), free_dma_buffer(9), ibmvmc_get_valid_hmc_buffer(9), ibmvmc_get_free_hmc_buffer(9), ibmvmc_free_hmc_buffer(9), ibmvmc_count_hmc_buffers(9), ibmvmc_get_free_hmc(9), ibmvmc_return_hmc(9), ibmvmc_send_open(9), ibmvmc_send_close(9), ibmvmc_send_capabilities(9), ibmvmc_send_add_buffer_resp(9), ibmvmc_send_rem_buffer_resp(9), ibmvmc_send_msg(9), ibmvmc_open(9), ibmvmc_close(9), ibmvmc_read(9), ibmvmc_poll(9), ibmvmc_write(9), ibmvmc_setup_hmc(9), ibmvmc_ioctl_sethmcid(9), ibmvmc_ioctl_query(9), ibmvmc_ioctl_requestvmc(9), ibmvmc_add_buffer(9), ibmvmc_rem_buffer(9), ibmvmc_process_capabilities(9), ibmvmc_validate_hmc_session(9), ibmvmc_reset(9), ibmvmc_reset_task(9), ibmvmc_process_open_resp(9), ibmvmc_process_close_resp(9), ibmvmc_crq_process(9), ibmvmc_handle_crq_init(9), ibmvmc_handle_crq(9), ibmvmc_init_crq_queue(9)

like, the whole squad. no one left behind 💜

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and that's the page!! 🎀 this lil gem lives over in ./drivers/misc, dated October 2026, and it's your girl ibmvmc_ioctl(9) signing off — mwah 💋✨