isst_store_cmd(9)

💅 isst_store_cmd(9) — the kernel API manual, but make it make sense

okay so bestie, welcome to the isst_store_cmd page ✨ this one lives in the Kernel API Manual, section 9, and honestly? it's short, it's sweet, and it's about to be your new fave little hash-table helper. no cap. 🎀

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✨ NAME ✨

isst_store_cmd — store a command into a hash table 🗂️💖

like, literally just yeet the command into the hash table. that's the whole vibe.

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🌸 SYNOPSIS 🌸

int isst_store_cmd (int cmd , int sub_cmd , u32 cpu , int mbox_cmd_type
, u32 param , u64 data );

six args, one int coming back at you. she's compact, she's focused, she knows what she wants 🫶

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🦋 ARGUMENTS 🦋

okay so here's the roster, no skips, no cuts 👑

• cmd — the Mailbox command. this is the main character of the whole call tbh 👑
• sub_cmd — the Mailbox sub-command or the MSR id. yes, it's giving dual purpose. iykyk 💅
• cpu — the target CPU for the command. gotta know which cpu we're talking to, fr fr 🎯
• mbox_cmd_type — tells you whether this is a Mailbox command or an MSR command. pick a lane bestie 🌈
• param — the Mailbox parameter 🍓
• data — the Mailbox request data or the MSR data. again with the either/or, she contains multitudes ✨

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💖 DESCRIPTION 💖

here's the tea ☕ — isst_store_cmd stores the command into a hash table if there's no such command already stored. so if it's new, it goes in. simple. iconic. 💅

but if the command is already stored? then it just updates the latest parameter and data for that command. no duplicate entries, no drama, just a glow-up on the existing one 🔥

so basically: first time → insert. next time → update. she's efficient like that 🧚

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⭐ RETURN ⭐

the return value is the result of the store to the hash table:

• 0 → success, we ate 💖✅
• others → failure 😭💀

that's it, that's the whole return contract. 0 is the good one, everything else is a no from her 🙈

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🎀 SEE ALSO 🎀

• Kernel file: ./drivers/platform/x86/intel/speed_select_if/isst_if_common.c — go read the source bestie, it's right there 📂
• isst_resume_common(9)
• isst_if_mbox_cmd_invalid(9)
• isst_if_mbox_cmd_set_req(9)
• isst_if_get_pci_dev(9)
• isst_if_cdev_register(9)
• isst_if_cdev_unregister(9)

the whole friend group, all linked above — go say hi to the rest of the isst_if_* girlies 🫶🌸

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okay that's the page!! mwah 💋 this came to you straight from ./drivers/platform/x86/intel/s... (you know the file, the one up there ⬆️) and it's dated October 2026, so mark your calendar bestie 🗓️✨ bye now, go store some commands responsibly 🦋💜