STRUCT SOF_IPC4_DMA_CONFIG(9)

✨ struct sof_ipc4_dma_config(9) ✨

okay bestie, gather round 💖 this is the struct sof_ipc4_dma_config page from the Kernel API Manual — it's the DMA configuration struct, and honestly it's giving "small but mighty." Let's get into it 🎀

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🌸 NAME 🌸

struct sof_ipc4_dma_config — DMA configuration, no cap. that's literally the whole job 💅

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🦋 SYNOPSIS 🦋

struct sof_ipc4_dma_config {
    uint8_t dma_method;
    uint8_t pre_allocated_by_host;
    uint32_t dma_channel_id;
    uint32_t stream_id;
    struct sof_ipc4_dma_stream_ch_map dma_stream_channel_map;
    uint32_t dma_priv_config_size;
    uint8_t dma_priv_config[];
 };

look at that layout, it's iconic 🫶 every field exactly where it belongs.

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🎀 Members 🎀

the vibe check on every single field, one by one ✨

• dma_method — HDAudio or GPDMA. pick your fighter 💀 that's the DMA method, fr.
• pre_allocated_by_host — 1 if the host driver allocates DMA channels, 0 otherwise. lowkey a yes/no situation 🙈
• dma_channel_id — for HDaudio this is defined as stream_id - 1. do the math, bestie 🧮
• stream_id — HDaudio stream tag 🏷️
• dma_stream_channel_map — array of device/channel mappings. it's an array of struct sof_ipc4_dma_stream_ch_map, and it's carrying the whole mapping situation on its back 💪
• dma_priv_config_size — currently not used. not me showing up to the group chat just to say nothing 😭
• dma_priv_config — currently not used either. matching energy, honestly 💀

ngl, two whole fields sitting there "currently not used" — they're just vibing, pre-allocated by the compiler. don't count on them for anything, that's the whole tea 🍓

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🔥 SEE ALSO 🔥

if you're going down this rabbit hole (and you are, i can tell 👀), the Kernel file lives at ./sound/soc/sof/ipc4-topology.h, and it's surrounded by absolute icons:

• struct sof_ipc4_pipeline(9)
• struct ipc4_pipeline_set_state_data(9)
• struct sof_ipc4_pin_format(9)
• struct sof_ipc4_available_audio_format(9)
• struct sof_copier_gateway_cfg(9)
• struct sof_ipc4_copier_data(9)
• struct sof_ipc4_gtw_attributes(9)
• struct sof_ipc4_dma_device_stream_ch_map(9)
• struct sof_ipc4_dma_stream_ch_map(9)
• struct sof_ipc4_dma_config_tlv(9)
• struct sof_ipc4_copier(9)
• struct sof_ipc4_ctrl_value_chan(9)
• struct sof_ipc4_control_data(9)
• struct sof_ipc4_control_msg_payload(9)
• struct sof_ipc4_gain_params(9)
• struct sof_ipc4_gain_data(9)
• struct sof_ipc4_gain(9)
• struct sof_ipc4_mixer(9)
• struct sof_ipc4_src(9)
• struct sof_ipc4_asrc(9)
• struct sof_ipc4_base_module_cfg_ext(9)
• struct sof_ipc4_process(9)

that's the full roster, main character energy all around 👑

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and that's the page, bestie!! 🧚 from ./sound/soc/sof, dated October 2026 — go forth and configure your DMA, you're gonna slay 💜✨