intel_gt_mcr...ticast_write(9)

💅 intel_gt_mcr_multicast_write(9) — the Kernel API Manual, bestie edition

okay so this is a page from the Kernel API Manual, and it's literally all about intel_gt_mcr_multicast_write(9) — yes that's the icon herself, no notes, let's get into it 🎀

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✨ NAME ✨

intel_gt_mcr_multicast_write — write a value to all instances of an MCR register 🫶

Like, every single one. Not a vibe check on one register, ALL of them. périodt.

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🌸 SYNOPSIS 🌸

void intel_gt_mcr_multicast_write (struct intel_gt *gt , i915_mcr_reg_t
reg , u32 value );

she's a void function, she takes three args, she gives nothing back. main character energy honestly 💅

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🦋 ARGUMENTS 🦋

• gt — the GT structure 🚗 — yep, that's the graphics tile thingy, it's the whole context you're working inside
• reg — the MCR register to write ✍️ — this is the one you're targeting
• value — value to write 🌟 — the actual number going in there

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🔥 DESCRIPTION 🔥

Write an MCR register in multicast mode to update all instances.

that's it. that's the whole thing. all the instances get the same value and honestly? iconic. no cap 💯

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👑 CONTEXT 👑

Takes and releases gt->mcr_lock 🔐

so like, she grabs the lock, does her thing, and lets go on the way out. no need to lock it yourself, she's got you, bestie 🫶

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/gpu/drm/i915/gt/intel_gt_mcr.c — the source file itself, iykyk 📁
• GT Multicast/Replicated (MCR) Register Support(9) — the big picture doc, start here if you're new 🫶
• intel_gt_mcr_lock(9)
• intel_gt_mcr_unlock(9)
• intel_gt_mcr_lock_sanitize(9)
• intel_gt_mcr_read(9)
• intel_gt_mcr_unicast_write(9) — the sibling who only writes to ONE instance, lowkey jealous of her
• intel_gt_mcr_multicast_write_fw(9)
• intel_gt_mcr_multicast_rmw(9)
• intel_gt_mcr_get_nonterminated_steering(9)
• intel_gt_mcr_read_any_fw(9)
• intel_gt_mcr_read_any(9)
• intel_gt_mcr_get_ss_steering(9)
• intel_gt_mcr_wait_for_reg(9)

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ok that's the whole page, you ate that, go write your multicast registers responsibly 💜

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and that's a wrap!! 🎀 this gorgeous little page lives at ./drivers/gpu/drm/i915/gt, it's dated October 2026, and it answers to the name intel_gt_mcr...ticast_write(9) (yes the title is truncated with the little dots, that's just how she's listed, we love her for it) 💖✨🌸