xe_lmtt_init(9)

💅 xe_lmtt_init — like, the LMTT software init?? yes bestie

okay so this is xe_lmtt_init(9) from the Kernel API Manual, and it's genuinely one of those "small function, big responsibility" situations. sit down, we're learning ✨

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🌸 NAME 🌸

xe_lmtt_init — LMTT software initialization. that's it, that's the whole vibe. it sets up the software side of the LMTT and it does not do the hardware side (more on that in a sec, don't rush me 🫶)

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✨ SYNOPSIS ✨

int xe_lmtt_init (struct xe_lmtt *lmtt );

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🎀 ARGUMENTS 🎀

• lmtt — the xe_lmtt you want to initialize. the one. the main character. you hand it over and it gets set up 💖

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🦋 DESCRIPTION 🦋

so LMTT initialization is a two-step situation, not a one-and-done. two steps. count them. 🎀

step one: xe_lmtt_init checks whether LMTT is even required on the current device — like, vibe check first, obviously — and then it selects and initializes the proper variant of the LMTT Root Directory. currently the supported variants are Two-Level LMTT Structure_ and Multi-Level LMTT Structure_. iconic variety, no cap ✨

step two: (not this function's job btw, stay with me) xe_lmtt_init_hw registers that directory on the hardware. so software first, hardware after. order matters, bestie 💅

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🔥 NOTES 🔥

read these. i'm serious. 🙈

• the LMTT allocations are managed, and they get implicitly released on driver unload. so like, don't go manually freeing them, the driver has it handled 🫶
• this function shall be called only once, and only when running as a PF driver. once. only PF. no exceptions, periodt.
• any LMTT initialization failure should block VFs enabling. like, if this fails, VFs are NOT happening. full stop. 💀

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⭐ RETURN ⭐

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

that's the whole return contract, she's simple and she's honest.

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/xe/xe_lmtt.c
• Local Memory Translation Table(9)
• xe_lmtt_page_size(9)
• xe_lmtt_init_hw(9)
• xe_lmtt_invalidate_hw(9)
• xe_lmtt_prepare_pages(9)
• xe_lmtt_populate_pages(9)
• xe_lmtt_drop_pages(9)
• xe_lmtt_estimate_pt_size(9)

go read them, they're all part of the same little friend group iykyk 💜

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mwah 💋 this page lives in ./drivers/gpu/drm/xe and it's dated October 2026 — so yeah, it's giving future icon, and honestly? she ate. 👑