dsm_evaluate(9)

💅 dsm_evaluate(9) — like, the Kernel API Manual page, bestie ✨

okay so welcome to dsm_evaluate(9), straight out of the Kernel API Manual and honestly? she's a little icon. tiny function, big job: she sends the DSM PCIe SSD Status LED command. yes, that one. the blinky light. the main character of your drives. 🌈

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🎀 NAME

dsm_evaluate — send DSM PCIe SSD Status LED command. that's it, that's the whole vibe check. 🦋

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✨ SYNOPSIS

int dsm_evaluate (struct pci_dev *pdev , u64 dsm_func , struct
dsm_output *output , u32 value_to_set );

like, four args, returns an int, we love a simple signature fr fr 💖

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🌸 ARGUMENTS

• pdev — PCI device. the actual PCI device you're working with, periodt. 🫶
• dsm_func — DSM LED Function. which LED function you're asking for, iykyk. 🔥
• output — buffer to copy DSM Response. she's the destination, the place the response gets copied to, no cap. 🎀
• value_to_set — value for SET_STATE_DSM function. so like, the value you want to set when you're doing the SET_STATE_DSM thing. 💅

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💜 DESCRIPTION

okay so the whole point: to not bother the caller with ACPI context, the returned _DSM Output Buffer is copied. 🫶

that's it!! that's the entire character arc!! you don't have to deal with ACPI context, because the returned _DSM Output Buffer gets copied for you. lowkey thoughtful of her ngl ✨

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🦋 SEE ALSO

• Kernel file ./drivers/pci/npem.c
• struct npem_led(9)
• struct npem_ops(9)
• struct npem(9)

go read the friends, they're all linked in the kernel file ./drivers/pci/npem.c and they ate, honestly 👑

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💀 reminder bestie: everything above is literally the whole manpage. no extra lore, no invented behaviour, just the facts with a glow-up. 🧚

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mwah 💋 this page lives in ./drivers/pci, dated October 2026, and she's called dsm_evaluate(9) — slay, bye!! 🍓✨