STRUCT I3C_DMA(9)

💅 NAME 💅

struct i3c_dma — okay so this is the DMA transfer and mapping descriptor, and honestly she's the whole vibe of getting your data moved around ✨ (this one's from the Kernel API Manual, section 9, iykyk).

🎀 SYNOPSIS 🎀

struct i3c_dma {
    struct device *dev;
    void *buf;
    size_t len;
    size_t map_len;
    dma_addr_t addr;
    enum dma_data_direction dir;
    void *bounce_buf;
 };

🦋 Members 🦋

• dev — the device object of a device doing DMA. like, who is doing the transferring, bestie 💖
• buf — destination/source buffer for DMA. the actual data hangout spot ✨
• len — length of transfer. how much we're moving, no cap 📏
• map_len — length of DMA mapping 🌸
• addr — mapped DMA address for a Host Controller Driver. the address the HCD actually gets to use 🫶
• dir — DMA direction. which way the data's flowing, periodt 🧚
• bounce_buf — an allocated bounce buffer if transfer needs it or NULL. literally either a whole buffer or NULL, no in-between 💀

🌈 SEE ALSO 🌈

Kernel file ./include/linux/i3c/master.h — and the whole friend group, honestly, they all show up together:

• struct i3c_i2c_dev_desc(9)
• struct i2c_dev_boardinfo(9)
• struct i2c_dev_desc(9)
• struct i3c_ibi_slot(9)
• struct i3c_device_ibi_info(9)
• struct i3c_dev_boardinfo(9)
• struct i3c_dev_desc(9)
• struct i3c_device(9)
• enum i3c_bus_mode(9)
• enum i3c_open_drain_speed(9)
• enum i3c_addr_slot_status(9)
• struct i3c_bus(9)
• struct i3c_master_controller_ops(9)
• struct i3c_master_controller(9)
• i3c_bus_for_each_i2cdev(9)
• i3c_bus_for_each_i3cdev(9)
• i3c_dev_get_master_data(9)
• i3c_dev_set_master_data(9)
• i2c_dev_get_master_data(9)
• i2c_dev_set_master_data(9)
• i3c_dev_get_master(9)
• i2c_dev_get_master(9)
• i3c_master_get_bus(9)

go read them, bestie, they're all main character energy in their own way 👑

k that's the whole page 💜 this lil gem lives in ./include/linux/i3c, dated October 2026, and she answers to the name struct i3c_dma(9). slay, go map some DMA 🎀✨