STRUCT SDMA_CONTEXT_DATA(9)

💅 struct sdma_context_data(9)

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for struct sdma_context_data, and yes we're gonna get through it together, no cap 🫶

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🌸 NAME 🌸

struct sdma_context_data — the sdma context that's specific to one channel 🎀 (like, one channel's whole lil personality, locked in a struct)

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✨ SYNOPSIS ✨

struct sdma_context_data {
    struct sdma_state_registers  channel_state;
    u32 gReg[8];
    u32 mda;
    u32 msa;
    u32 ms;
    u32 md;
    u32 pda;
    u32 psa;
    u32 ps;
    u32 pd;
    u32 ca;
    u32 cs;
    u32 dda;
    u32 dsa;
    u32 ds;
    u32 dd;
    u32 scratch0;
    u32 scratch1;
    u32 scratch2;
    u32 scratch3;
    u32 scratch4;
    u32 scratch5;
    u32 scratch6;
    u32 scratch7;
 };

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🦋 Members 🦋

okay this is the part where we meet the whole cast, main character energy only 👑

💖 the state bit

• channel_state — the channel state bits 💫 the vibe check of the whole channel, fr

🎀 the general registers

• gReg — general registers, a whole array of 8 of them, they're the general-purpose besties

🔥 burst dma crew

• mda — burst dma destination address register 📍 where it's going
• msa — burst dma source address register 📍 where it came from
• ms — burst dma status register 🩺 the current mood
• md — burst dma data register 📦 the actual goodies

🌈 peripheral dma crew

• pda — peripheral dma destination address register 📍
• psa — peripheral dma source address register 📍
• ps — peripheral dma status register 🩺
• pd — peripheral dma data register 📦

⭐ the crc girlies

• ca — CRC polynomial register 🧮 the recipe
• cs — CRC accumulator register 🧮 the running total

👑 dedicated core crew

• dda — dedicated core destination address register 📍
• dsa — dedicated core source address register 📍
• ds — dedicated core status register 🩺
• dd — dedicated core data register 📦

🧚 scratch time (dedicated ram, for context switch)

• scratch0 — 1st word of dedicated ram for context switch 🍓
• scratch1 — 2nd word of dedicated ram for context switch 🍓
• scratch2 — 3rd word of dedicated ram for context switch 🍓
• scratch3 — 4th word of dedicated ram for context switch 🍓
• scratch4 — 5th word of dedicated ram for context switch 🍓
• scratch5 — 6th word of dedicated ram for context switch 🍓
• scratch6 — 7th word of dedicated ram for context switch 🍓
• scratch7 — 8th word of dedicated ram for context switch 🍓

not a single scratch word skipped, we ate that 💅

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🔍 SEE ALSO 🔍

go read these next, bestie, they're all in the kernel file ./drivers/dma/imx-sdma.c 👀

• struct sdma_channel_control(9)
• struct sdma_state_registers(9)
• struct sdma_desc(9)
• struct sdma_channel(9)
• struct sdma_firmware_header(9)

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and that's the page!! 🎉 this lil gem lives under ./drivers/dma and it's dated October 2026 — so like, future iconic 💜 mwah, go forth and dma responsibly 🧚✨