xe_mmio_probe_early(9)

💅 xe_mmio_probe_early — NAME ✨

okay so bestie, this is xe_mmio_probe_early(9) from the Kernel API Manual, and no cap, it's giving "first day on the job" energy — it probes and initializes the device's MMIO 🎀

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🌸 SYNOPSIS 🌸

int xe_mmio_probe_early (struct xe_device *xe );

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🫶 ARGUMENTS 🫶

• xe — literally the xe_device, that's the whole vibe. it's the thing you're poking at 💖

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🔥 DESCRIPTION 🔥

so what does it actually do, you ask? it maps the entire GTTMMADR_BAR and initializes the first tile's MMIO instance. iconic behavior, honestly ✨

and here's the tea about the memory map 🍓 — the first 16MB of the GTTMMADR_BAR always belongs to the root tile, and it includes:

• registers — 0-4MB 👑
• reserved space — 4MB-8MB 🙈 (don't touch, it's reserved, respect the boundaries bestie)
• GGTT — 8MB-16MB 🔥

that's the whole layout, periodt. memorize it like your fave's birthday 💅

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⭐ RETURN ⭐

• 0 on success 🎉
• a negative error code on failure 😭

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🦋 SEE ALSO 🦋

the kernel file is right here: ./drivers/gpu/drm/xe/xe_mmio.c — go read it, iykyk 📖

• xe_mmio_probe_tiles(9)
• xe_mmio_init(9)
• xe_mmio_read64_2x32(9)
• xe_mmio_wait32(9)
• xe_mmio_wait32_not(9)
• xe_mmio_init_vf_view(9)

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and that's the whole page, bestie!! this little gem lives in ./drivers/gpu/drm/xe, hails from October 2026, and answers to the name xe_mmio_probe_early(9). mwah 💋 go map some MMIO, you got this 🫶✨