STRUCT SCMI_SMC(9)

💅 struct scmi_smc(9) — like, the whole Kernel API Manual page, but make it make sense 🫶

okay bestie, sit down, grab a strawberry 🍓 — this is the struct scmi_smc page from the Kernel API Manual, and it's literally the glow-up of a struct: it's the thing that represents a SCMI smc transport ✨. no cap, that's the whole vibe. it's giving "tiny struct, main character energy" 👑

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✨ NAME ✨

struct scmi_smc — Structure representing a SCMI smc transport 🦋

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🌸 SYNOPSIS 🌸

here's the whole fit, laid out exactly, don't touch a single character bestie:

struct scmi_smc {
    int irq;
    struct scmi_chan_info *cinfo;
    struct scmi_shared_mem __iomem *shmem;
    struct scmi_shmem_io_ops *io_ops;
    struct mutex shmem_lock;
  #define INFLIGHT_NONE   MSG_TOKEN_MAX;
    atomic_t inflight;
    unsigned long func_id;
    unsigned long param_page;
    unsigned long param_offset;
    unsigned long cap_id;
 };

like, obsessed with how tidy that is 🎀

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🦋 Members 🦋

okay so now we go member by member, and every single one gets its moment ✨

• irq — an optional IRQ for completion. optional! she can show up, she can stay home, no pressure 💅
• cinfo — SCMI channel info 📡
• shmem — the Transmit/Receive shared memory area 💖
• io_ops — transport specific I/O operations 🧚
• shmem_lock — the lock that protects access to the Tx/Rx shared memory area. used when you're NOT operating in atomic mode 🔒
• inflight — an atomic flag that protects access to the Tx/Rx shared memory area. used when you are operating in atomic mode ⚡
• func_id — the smc/hvc call function id 📞
• param_page — the 4K page number of the shmem channel 📄
• param_offset — the offset within the 4K page of the shmem channel 📍
• cap_id — the smc/hvc doorbell's capability id, to be used on Qualcomm virtual platforms 👑

ngl, the shmem_lock vs inflight duality is highkey iconic — one for the non-atomic girlies, one for the atomic girlies, and they both protect the exact same Tx/Rx shared memory area. pick your lane, bestie 💀

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💜 SEE ALSO 💜

• Kernel file ./drivers/firmware/arm_scmi/transports/smc.c 🫶

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and that's the page!! fr fr, sourced straight from ./drivers/firmware/arm_scmi/tr... and dated October 2026, still out here being struct scmi_smc(9) and slaying 💖🎀🌈