STRUCT ST_FDMA_HW_NODE(9)

💖 NAME — struct st_fdma_hw_node(9) 💖

okay so struct st_fdma_hw_node is the Node structure used by fdma hw. That’s the whole assignment, bestie, and we’re gonna slay it.

✨ SYNOPSIS ✨

struct st_fdma_hw_node {
    u32 next;
    u32 control;
    u32 nbytes;
    u32 saddr;
    u32 daddr;
    union {
      struct st_fdma_generic_node generic;
    };
 };

🎀 Members 🎀

• next — pointer to next node. literally the “who’s next” of the whole situation.
• control — Transfer Control Parameters.
• nbytes — Number of Bytes to read.
• saddr — Source address.
• daddr — Destination address.
• {unnamed_union} — anonymous. yes, it’s giving mysterious unnamed-union main character energy.
  • generic — generic node for free running/paced transfert type 2. Others transfert type are possible, but not yet implemented.

🌸 Description 🌸

vibe check, and this one is serious: the NODE structures must be aligned to a 32 byte boundary. not optional, no cap.

⚠️ 32 byte boundary alignment is the rule. the NODE structures must be aligned to it, periodt.

🦋 SEE ALSO 🦋

• Kernel file ./drivers/dma/st_fdma.h — plus struct st_fdma_generic_node(9) and struct st_fdma_sw_node(9).

💅 from the Kernel API Manual, source/version ./drivers/dma, dated October 2026, for struct st_fdma_hw_node(9) — byeee 🫶