drm_ioctl(9)

🎀 drm_ioctl(9) 🎀

okay bestie, welcome to drm_ioctl(9) from the Kernel API Manual — yes, the whole manual name is in the group chat now. This is the ioctl callback implementation for DRM drivers, and it's lowkey iconic. 💅

✨ NAME ✨

drm_ioctl — ioctl callback implementation for DRM drivers 💖

🌸 SYNOPSIS 🌸

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

🦋 ARGUMENTS 🦋

• filp — the file this ioctl is called on.
• cmd — ioctl cmd number.
• arg — user argument.

🔥 DESCRIPTION 🔥

So here's the vibe: it looks up the ioctl function in the DRM core and the driver dispatch table, stored in drm_driver.ioctls. Then it checks for the necessary permission by calling drm_ioctl_permit, and dispatches to the respective function. That's the main-character move, no cap. ✨

💜 RETURN 💜

Zero on success, negative error code on failure. Slay = 0; not slay = negative error code. 😭

🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/drm_ioctl.c
• getunique and setversion story(9)
• drm_noop(9)
• drm_invalid_op(9)
• driver specific ioctls(9)
• drm_ioctl_flags(9)

mwah 💋 — source/version is ./drivers/gpu/drm, date is October 2026, and that's the cute little sign-off. 🫶