DRM_IOCTL_ETHOSU(9)

💖 DRM_IOCTL_ETHOSU(9) 💖

okay bestie, gather round 🫶 this is DRM_IOCTL_ETHOSU(9) from the Kernel API Manual, and she's a tiny one but she's important — she builds the ethosu IOCTL number, which is the little golden ticket userspace hands to the kernel like "hi yes i'd like to talk to the ethosu driver please 💅". No cap, that's the whole job.

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✨ SYNOPSIS ✨

DRM_IOCTL_ETHOSU (__access , __id , __type );

three little args, in that order, parentheses and all, periodt 🌸

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🎀 ARGUMENTS 🎀

• __access — the access type, babes. It must be R, W, or RW — like, those are the only three vibes allowed here, don't try anything else 🙈
• __id — one of the DRM_ETHOSU_xxx id values. iykyk 🦋
• __type — the suffix of the type being passed to the IOCTL. it's the little name-tag on the end ✨

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💖 DESCRIPTION 💖

okay so this is the part where i have to be the responsible friend: don't use this macro directly. like, i know it's right there and it's tempting, but no 🙅‍♀️ you use the DRM_IOCTL_ETHOSU_xxx values instead. those are the main-character values, this macro is just the stage crew. respect the pipeline, bestie 💯

fr fr: this is a "look but don't touch" situation — the real usage is the DRM_IOCTL_ETHOSU_xxx constants, not this macro.

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🔥 RETURN 🔥

it returns an IOCTL number 🔢 — and that number is exactly what you pass to ioctl from userspace. that's it, that's the whole return value, and honestly? she ate. 👑

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🦋 SEE ALSO 🦋

go read these next, they're all linked in the kernel file ./include/uapi/drm/ethosu_accel.h and they're all iconic in their own way 🧚:

• IOCTL IDs(9)
• IOCTL arguments(9)
• enum drm_ethosu_dev_query_type(9)
• struct drm_ethosu_dev_query(9)
• enum drm_ethosu_bo_flags(9)
• struct drm_ethosu_bo_create(9)
• struct drm_ethosu_bo_mmap_offset(9)
• struct drm_ethosu_job(9)
• struct drm_ethosu_submit(9)
• struct drm_ethosu_perfmon_set_global(9)

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and that's the page!! 🎀 this little cutie lives in ./include/uapi/drm, version dated October 2026, and that's the whole DRM_IOCTL_ETHOSU(9) moment. go forth and build your IOCTL numbers the correct way, ily, mwah 💜🌈⭐