xe_guc_db_mgr_init(9)

✨ xe_guc_db_mgr_init(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this is the page for xe_guc_db_mgr_init, and yes it's a mouthful, but it's literally just "initialize the GuC Doorbells Manager" and we're gonna get through it together 🫶

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🎀 NAME 🎀

xe_guc_db_mgr_init — Initialize GuC Doorbells Manager.

like, the whole job is in the name, ngl.

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🌸 SYNOPSIS 🌸

int xe_guc_db_mgr_init (struct xe_guc_db_mgr *dbm , unsigned int count
);

it gives you back an int, that's the vibe check ✅

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🦋 ARGUMENTS 🦋

• dbm — the xe_guc_db_mgr you want to initialize. this is your main character struct, it's the thing you're setting up 💅
• count — how many doorbells you want to manage. the actual number, no vibes-based guessing ✨

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💜 DESCRIPTION 💜

so here's the tea ☕ the bare-metal driver or the PF driver can pass ~0 as count to say "yeah give me all the doorbells the hardware supports, i can use 'em" — no cap, that's the signal 🔥

but only VF's drivers have to actually provide an explicit number of doorbell IDs that they can use. like, they gotta be specific. the rest of y'all just get the ~0 shortcut 🎀

lowkey important: ~0 is not a real doorbell count, it's the "all of them" flag. don't be out here thinking it means something else fr fr 🙈

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🌈 RETURN 🌈

• 0 on success — slay 💅
• a negative error code on failure — 😭 but at least you know

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⭐ SEE ALSO ⭐

go read these next, bestie, they're all in the same friend group 🫶

• Kernel file ./drivers/gpu/drm/xe/xe_guc_db_mgr.c GuC Doorbells(9)
• xe_guc_db_mgr_reserve_id_locked(9)
• xe_guc_db_mgr_release_id_locked(9)
• xe_guc_db_mgr_reserve_range(9)
• xe_guc_db_mgr_release_range(9)
• xe_guc_db_mgr_print(9)

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and that's the whole page, icon 👑 it lives in ./drivers/gpu/drm/xe, and this manual is dated October 2026 — so like, future-core of it all 🦋 mwah, go init some doorbells, you got this 💖