pmc_ssram_te...get_pmc_info(9)

💖 NAME 💖

pmc_ssram_telemetry_get_pmc_info — okay so this one is literally just here to hand you a PMC's devid and base_addr, that's the whole vibe 🫶

Oh and hey — this is a page from the Kernel API Manual, section 9, bestie. Welcome to the kernel-adjacent corner of the group chat ✨

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🌸 SYNOPSIS 🌸

int pmc_ssram_telemetry_get_pmc_info (unsigned int pmc_idx , struct
       pmc_ssram_telemetry *pmc_ssram_telemetry );

No cap, that's the whole signature. Two args, one int coming back at you 💅

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🎀 ARGUMENTS 🎀

• pmc_idx — the index of the PMC. which one do you want, bestie, pick a number 🦋
• pmc_ssram_telemetry — a pmc_ssram_telemetry structure, and it's where the PMC info gets stored. it's giving "bring your own container" 🎁

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✨ DESCRIPTION ✨

Okay so here's the tea — there's a little state machine running per PMC index, and you gotta know which state you're walking into before you go reading anything. vibe check time 🔍

• PMC_SSRAM_UNPROBED — nobody's even started probing this index yet. it's fresh out of the box, untouched, a blank slate 🌱
• PMC_SSRAM_PROBING — probe is currently out here discovering data for this index. mid-quest, do not disturb 🏃‍♀️💨
• PMC_SSRAM_PRESENT — slay!! base_addr/devid were published and you can read them. the data is live, go get it 👑
• PMC_SSRAM_ABSENT — no data available for this index. it's not here, it never showed up, it's not coming 😭

Now for the memory-ordering lore, because this part is actually important, no cap 🧠✨

Readers use an acquire load of the state. So if the state comes back PRESENT, your reads of base_addr/devid are ordered after that state observation — and they pair with the writer's release-store when it published PRESENT. It's giving a perfectly choreographed handoff 🤝 iykyk

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🔥 RETURN 🔥

• 0 — success! we ate 💅
• -EAGAIN — the probe function has not finished yet. just try again, bestie, patience is a vibe 🙈
• -EINVAL — invalid pmc_idx. mm, that index is not it 💀
• -ENODEV — the PMC device is not available (hardware absent or the driver failed to initialize). literally not found, ghosted 🍓

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🦋 SEE ALSO 🦋

Kernel file ./drivers/platform/x86/intel/pmc/ssram_telemetry.c — go read the source, it's iconic 🌈

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kisses from the kernel 💜 this page lives under ./drivers/platform/x86/intel/pmc, dated October 2026, and it's page pmc_ssram_telemetry_get_pmc_info(9) of the Kernel API Manual — go off, bestie, you got this 🎀✨