hubbub60_per...ndwidth_mbps(9)

💅 hubbub60_per...ndwidth_mbps(9) — like, the whole vibe ✨

okay so bestie, welcome to the Kernel API Manual page for hubbub60_per...ndwidth_mbps(9) 🫶 this one's a little kernel-side baddie from the display driver world and she's here to tell you how much out-of-order bandwidth you're pulling. no cap, she's short but she serves. 🌸

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🎀 NAME 🎀

hubbub60_perfmon_get_out_of_order_bandwidth_mbps — read the out-of-order BW counter result 💫

like literally, that's the whole job. she reads the counter and hands you the number. main character energy fr.

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✨ SYNOPSIS ✨

uint32_t hubbub60_perfmon_get_out_of_order_bandwidth_mbps (struct hubbub
*hubbub , uint32_t refclk_mhz , uint32_t *duration_ns );

that's the whole signature, copy it exactly okay, don't be out here editing it 🙈

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🌈 ARGUMENTS 🌈

• hubbub — pointer to the hubbub hardware instance 💖 like, the actual hardware bestie, she needs to know which hubbub we're talking to
• refclk_mhz — the reference clock frequency in MHz 🕰️ it's used for the duration conversion, so it's lowkey doing the math heavy lifting
• duration_ns — output parameter ✨ she receives the measured duration in nanoseconds. so yeah, you pass her in and she comes back with a value, iykyk

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🦋 DESCRIPTION 🦋

okay so here's what's happening: she reads hardware counters 1 (that's the data one 📊) and 4 (that's the duration one ⏱️), then converts that raw refclk-cycle count into bandwidth in Mbps 🎀

the way that raw cycle count just becomes a bandwidth number is honestly iconic. math ate. periodt. 💅

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🔥 RETURN 🔥

out-of-order bandwidth in Mbps 👑 that's it, that's the return value, go off king

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🧚 SEE ALSO 🧚

• Kernel file ./drivers/gpu/drm/amd/display/dc/hubbub/dcn60/dcn60_hubbub.c — the source file, go read her, she's right there 📁
• hubbub60_perfmon_arm_measuring_out_of_order_bandwidth(9) — the arming one 🏹
• hubbub60_perfmon_start_measuring_out_of_order_bandwidth(9) — the starting one 🚀

these two are literally her siblings, they come as a set, obsessed 🫶

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and that's the page babes 💜 this came out of ./drivers/gpu/drm/amd/display/..., dated October 2026 — so like, future slay 🕰️✨ mwah, go read the source, ily, bye 🎀