STRUCT IPA_UC_MEM_AREA(9)

💅 NAME

struct ipa_uc_mem_area — the AP/microcontroller shared memory area, aka the lil group chat where the application processor and the microcontroller pass notes 🫶

✨ SYNOPSIS

struct ipa_uc_mem_area {
    u8 command;
    u8 reserved0[3];
    __le32 command_param;
    __le32 command_param_hi;
    u8 response;
    u8 reserved1[3];
    __le32 response_param;
    u8 event;
    u8 reserved2[3];
    __le32 event_param;
    __le32 first_error_address;
    u8 hw_state;
    u8 warning_counter;
    __le16 reserved3;
    __le16 interface_version;
    __le16 reserved4;
 };

🎀 MEMBERS

okay bestie, let's meet the whole cast, in order, no skips 💖

• command — the command code, going AP → microcontroller ✨
• reserved0 — reserved bytes; do not read them, do not write them, just leave them alone fr fr 🙈
• command_param — the low 32 bits of the command parameter (AP → microcontroller)
• command_param_hi — the high 32 bits of the command parameter (AP → microcontroller) 💅
• response — the response code, coming back microcontroller → AP
• reserved1 — reserved bytes; avoid reading or writing 🚫
• response_param — the response parameter (microcontroller → AP) 🦋
• event — the event code (microcontroller → AP)
• reserved2 — reserved bytes; avoid reading or writing 🚫
• event_param — the event parameter (microcontroller → AP) 🌸
• first_error_address — the address of the first error-source on SNOC 👀
• hw_state — state of the hardware (and yes, that includes the error type information) 🔥
• warning_counter — a counter of non-fatal hardware errors, keeping tally like a little notebook 📓
• reserved3 — reserved bytes; avoid reading or writing 🚫
• interface_version — the hardware-reported interface version 👑
• reserved4 — reserved bytes; avoid reading or writing 🚫

🌈 DESCRIPTION

So there's this shared memory area sitting right at the base of IPA resident memory, and its whole job is being the communication channel with the microcontroller 💬✨

The region is 128 bytes in size — but plot twist — only the first 40 bytes (the ones structured this way) actually get used 💀 like, the rest is just there vibing.

🦋 SEE ALSO

• Kernel file ./drivers/net/ipa/ipa_uc.c 📁
• The IPA embedded microcontroller(9) 🧚

and that's the whole vibe check, bestie 💜 this lil page came from ./drivers/net/ipa, dated October 2026, and it's your girl struct ipa_uc_mem_area(9) signing off — periodt 🎀💅