__genwqe_execute_ddcb(9)

💅 __genwqe_execute_ddcb — a lil kernel API manual moment

okay bestie, welcome to the __genwqe_execute_ddcb(9) page from the Kernel API Manual — yes it's a section 9 manpage, yes it's giving "driver internals only," and yes we're gonna read it together 🫶

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✨ NAME ✨

__genwqe_execute_ddcb — Execute DDCB request with addr translation 🔥

✨ SYNOPSIS ✨

int __genwqe_execute_ddcb (struct genwqe_dev *cd , struct
       genwqe_ddcb_cmd *cmd , unsigned int f_flags );

like, one function, three args, returns an int. simple queen behavior ✨

✨ ARGUMENTS ✨

ngl the original page is lowkey leaving us on read here, so I'm telling you exactly what it says — no more, no less 🙈

• cd — -- undescribed -- 😭
• cmd — -- undescribed -- 😭
• f_flags — -- undescribed -- 😭

not me documenting three arguments by saying they're undescribed 💀 that's literally what the source says though, so we keep it fr fr.

✨ DESCRIPTION ✨

okay so here's the tea 🍓 — this function will do the address translation changes to the DDCBs according to the definitions required by the ATS field.

it looks up the memory allocation buffer or does vmap/vunmap for the respective user-space buffers — and that's inclusive of, deep breath bestie:

• page pinning 📌
• scatter gather list buildup 🧱
• and teardown 🧹

so yeah, it's the whole glow-up pipeline for getting userspace memory into a shape the DDCB can vibe with. main character energy, honestly 👑

✨ SEE ALSO ✨

the whole friend group, assembled 🌈 — go read these too:

• Kernel file ./drivers/misc/genwqe/card_base.h
• struct genwqe_reg(9)
• struct dma_mapping(9)
• struct ddcb_queue(9)
• struct genwqe_dev(9)
• enum genwqe_requ_state(9)
• struct genwqe_sgl(9)
• struct ddcb_requ(9)
• struct genwqe_file(9)
• genwqe_get_slu_id(9)
• genwqe_write_vreg(9)
• genwqe_read_vreg(9)
• __genwqe_execute_raw_ddcb(9)
• genwqe_is_privileged(9)

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and that's the whole page, bestie 🎀 this one lives over in ./drivers/misc/genwqe, and the version/date stamp on it is October 2026 — so yeah, dated October 2026, driver path ./drivers/misc/genwqe, __genwqe_execute_ddcb(9), that's the sign-off 💜✨ go forth and translate those addresses, iykyk 🦋