mock_drm_getfile(9)

💅 mock_drm_getfile — the Kernel API Manual moment (section 9, bestie, we're in the kernel section)

okay so like. this is mock_drm_getfile(9), and it's genuinely one of those little helper functions that's giving backstage-pass energy — it lets kernel code do the whole "open a DRM device" thing without, y'know, actually bothering userspace about it. icon behaviour, honestly. 🎀

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✨ NAME ✨

mock_drm_getfile — make a brand-new struct file for the drm device, no userspace required 💅

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🌸 SYNOPSIS 🌸

struct file * mock_drm_getfile (struct drm_minor *minor , unsigned int flags );

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🦋 ARGUMENTS 🦋

• minor — the drm minor you wanna wrap up all cozy, like #drm_device.primary. that's the one. 🫶
• flags — the file creation mode, so like O_RDWR and friends. the usual suspects.

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💖 DESCRIPTION 💖

so what this does: it creates a new struct file that wraps a DRM file context around a DRM minor. basically it's out here mimicking userspace opening something like /dev/dri/card0 — except it does it without invoking userspace at all. no syscall, no context switch, no drama. ✨

and then? you've got options, bestie:

• you can operate on that struct file using its f_op (which is drm_device.driver.fops) to mimic userspace operations, or
• you can hand it over to userspace-facing functions as an internal/anonymous client.

either way, it's doing the most so you don't have to. 👑

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⭐ RETURN ⭐

a pointer to the newly created struct file on success. on failure? ERR_PTR. so like — check it, fr fr, don't just vibe-check a pointer and start dereferencing. 😭

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/drm_file.c
• file operations(9)
• drm_file_alloc(9)
• drm_file_free(9)
• drm_open(9)
• drm_release(9)
• drm_release_noglobal(9)
• drm_read(9)
• drm_poll(9)
• drm_event_reserve_init_locked(9)
• drm_event_reserve_init(9)
• drm_event_cancel_free(9)
• drm_send_event_timestamp_locked(9)
• drm_send_event_locked(9)
• drm_send_event(9)
• drm_print_memory_stats(9)
• drm_show_memory_stats(9)
• drm_show_fdinfo(9)
• drm_file_err(9)

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ngl this whole squad lives in ./drivers/gpu/drm — that's the group chat. go read the source. it ate. 💜

okay love u, bye — this page was served up from ./drivers/gpu/drm, dated October 2026, and it's mock_drm_getfile(9) signing off 🧚‍♀️🌸