radeon_acpi_vfct_match(9)

💅 radeon_acpi_vfct_match(9) — Kernel API Manual

okay so bestie, welcome to the Kernel API Manual entry for radeon_acpi_vfct_match(9) — the little matchmaker that checks if a VFCT entry matches the device. no cap, she’s here to do one job and do it cute. 🎀

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👑 NAME 👑

radeon_acpi_vfct_match — Check if a VFCT entry matches the device.

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✨ SYNOPSIS ✨

int radeon_acpi_vfct_match (struct radeon_device *rdev ,
       VFCT_IMAGE_HEADER *vhdr );

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🎀 ARGUMENTS 🎀

• rdev — Radeon device. the main character device energy.
• vhdr — VFCT image header to check. the header getting the vibe check, periodt.

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🌸 DESCRIPTION 🌸

Okay so here’s the tea: VFCT entries contain the PCI bus number as recorded during BIOS POST. On systems where the kernel renumbers PCI buses (e.g. pci=realloc or resource conflicts), the runtime bus number may differ from the POST value. So this function matches by device identity (vendor + device + function) and uses the bus number as a preference: exact bus match is preferred, but when the bus numbers disagree we accept the entry if the device identity matches. it’s giving flexible but picky in the right way. 💅

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💖 RETURN 💖

• 0 on match — slay, it matched. ✨
• -ENODEV on no match — not it, no match. 💀

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/gpu/drm/radeon/radeon_bios.c
• radeon_atrm_call(9)

iykyk 🫶

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mwah 💋 — this cutie lives under source/version ./drivers/gpu/drm/radeon and is dated October 2026. 🧚‍♀️