xe_lrc_alloc_seqno_fence(9)

💖 xe_lrc_alloc_seqno_fence(9) 💖

okay so bestie, welcome to the Kernel API Manual entry for xe_lrc_alloc_seqno_fence — yes that's a whole mouthful, yes we're gonna get through it together, and yes it's section 9 because kernel-internal stuff lives there. pull up a chair 🎀

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✨ NAME ✨

xe_lrc_alloc_seqno_fence — allocate an lrc seqno fence. that's it, that's the whole job description 💅

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🌸 SYNOPSIS 🌸

struct dma_fence * xe_lrc_alloc_seqno_fence (void );

so you call it, you pass it nothing, and it hands you back a struct dma_fence *. iconique. no cap 🫶

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🦋 ARGUMENTS 🦋

• void — literally no arguments. zero. nada. it's giving independent main character energy, it needs no input from you ✨

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💜 DESCRIPTION 💜

here's the tea 🍓: this function allocates an lrc seqno fence, but — and this is the important part — it does not initialize it. allocate ≠ initialize, bestie, those are two completely different vibes. so what you get back is a fence-shaped blank canvas, just sitting there waiting for someone (hint: probably xe_lrc_init_seqno_fence) to come along and actually fill it in 🔥

lowkey the chillest function in the file ngl.

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⭐ RETURN ⭐

what you get back is a pointer to the allocated fence — slay 🎉 — or, if things go sideways, a negative error pointer instead 😭. so yeah, do the whole IS_ERR() thing before you go dereferencing it, fr fr. that's not me being dramatic, that's just how error pointers work 🙈

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🌈 SEE ALSO 🌈

the whole friend group, assembled 👑 — all of these live in the kernel file ./drivers/gpu/drm/xe/xe_lrc.c:

• xe_gt_lrc_hang_replay_size(9)
• xe_lrc_reg_size(9)
• xe_lrc_engine_state_size(9)
• xe_lrc_ctx_timestamp_ggtt_addr(9)
• xe_lrc_ctx_timestamp_udw_ggtt_addr(9)
• xe_lrc_ctx_timestamp(9)
• xe_lrc_queue_timestamp(9)
• xe_lrc_ctx_job_timestamp_ggtt_addr(9)
• xe_lrc_ctx_job_timestamp(9)
• xe_default_lrc_update_memirq_regs_with_address(9)
• xe_lrc_update_memirq_regs_with_address(9)
• xe_lrc_setup_wa_bb_with_scratch(9)
• xe_lrc_set_multi_queue_priority(9)
• xe_lrc_create(9)
• xe_lrc_destroy(9)
• xe_lrc_update_hwctx_regs_with_address(9)
• xe_lrc_free_seqno_fence(9)
• xe_lrc_init_seqno_fence(9)
• xe_lrc_engine_id(9)
• xe_lrc_timestamp(9)
• xe_lrc_update_timestamp(9)
• xe_lrc_ring_is_idle(9)

like, the entire xe_lrc cinematic universe 💀 go read them, iykyk.

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aaaand that's the whole page, diva 🧚 this masterpiece comes courtesy of the fine folks over at ./drivers/gpu/drm/xe, dated October 2026 — so go forth, allocate your fence, and remember: allocation is not initialization 💖