STRUCT SBTSI_I3C_PRIV(9)

💖 struct sbtsi_i3c_priv(9) 💖

okay so this is a page from the Kernel API Manual, bestie, and we're talking about struct sbtsi_i3c_priv — no cap, it's the per-device state for I3C SBTSI, and it's literally carrying DMA-safe buffers in it. main character struct energy fr fr 🎀

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✨ NAME ✨

struct sbtsi_i3c_priv — per-device state for I3C SBTSI (includes DMA-safe buffers)

like... it holds the state, and it holds the buffers, and it does both at once. iconic behavior 💅

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🌸 SYNOPSIS 🌸

struct sbtsi_i3c_priv {
    struct sbtsi_data data;
    u8 tx[2];
    u8 rx;
 };

three members. that's it. that's the whole vibe. 🦋

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👑 Members 👑

• data — the public device state, exposed via dev_set_drvdata. this is the one everybody else gets to see, the extrovert of the struct 🫶
• tx — the outgoing I3C bytes, and no they're not optional: this is DMA_TO_DEVICE territory. [0] is the register address, [1] is the value. two bytes, one job, slayed ✨
• rx — the incoming I3C data byte, coming at you DMA_FROM_DEVICE. single byte, huge responsibility 😭

ok real talk though — those DMA directions are load-bearing. tx is DMA_TO_DEVICE, rx is DMA_FROM_DEVICE, and the whole "DMA-safe buffers" thing in the NAME line is not decoration. don't be out here messing with that 🙈

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/misc/amd-sbi/tsi-core.h — go read it, iykyk 💜

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and that's the whole page, bestie!! source is ./drivers/misc/amd-sbi and the date stamp says October 2026, so like... mark your calendar or whatever 🗓️💖 mwah, stay DMA-safe ⭐🧚💅