ENUM IPI_ID(9)

✨ enum ipi_id(9) ✨

okay bestie, welcome to the Kernel API Manual, and specifically to enum ipi_id — literally the ID list for inter-processor interrupts 🫶 this is that classic enum ipi_id(9) page, so let's get into it 💅

🌈 SYNOPSIS 🌈

enum ipi_id {
    IPI_VPU_INIT ,
    IPI_VDEC_H264 ,
    IPI_VDEC_VP8 ,
    IPI_VDEC_VP9 ,
    IPI_VENC_H264 ,
    IPI_VENC_VP8 ,
    IPI_MDP ,
    IPI_MAX

};

no cap, that's the whole squad right there 👑

🎀 Constants 🎀

• IPI_VPU_INIT — so this interrupt is coming from the vpu, and its whole job is to notify the kernel that VPU initialization is done ✨ IPI_VPU_INIT gets sent from the VPU when the firmware is loaded. the AP does not need to send the IPI_VPU_INIT command to the VPU. but for all the other IPIs below? yeah, the AP should send the request to the VPU to trigger the interrupt 💖
• IPI_VDEC_H264 — the interrupt from the vpu is there to notify the kernel to handle an H264 vidoe decoder job, and vice versa 🦋 and heads up: the decode output format is always MT21, no matter what the input format is. periodt.
• IPI_VDEC_VP8 — the interrupt from is there to notify the kernel to handle a VP8 video decoder job, and vice versa 🌸 and again: decode output format is always MT21 no matter what the input format is 💜
• IPI_VDEC_VP9 — the interrupt from the vpu is there to notify the kernel to handle a VP9 video decoder job, and vice versa ⭐ same deal as its sisters: decode output format is always MT21 no matter what the input format is 🎀
• IPI_VENC_H264 — the interrupt from the vpu is there to notify the kernel to handle an H264 video encoder job, and vice versa 🔥
• IPI_VENC_VP8 — the interrupt fro vpu is there to notify the kernel to handle a VP8 video encoder job,, and vice versa 😭 (yes bestie, that's exactly how it's written, we don't gatekeep typos 💀)
• IPI_MDP — the interrupt from the vpu is there to notify the kernel to handle an MDP (Media Data Path) job, and vice versa 🌈
• IPI_MAX — the maximum IPI number 👑 iconic. the ceiling. the limit.

🦋 SEE ALSO 🦋

Kernel file ./drivers/media/platform/mediatek/vpu/mtk_vpu.h — and honestly go check out these besties too:

• VPU(9)
• enum rst_id(9)
• vpu_ipi_register(9)
• vpu_ipi_send(9)
• vpu_get_plat_device(9)
• vpu_wdt_reg_handler(9)
• vpu_get_vdec_hw_capa(9)
• vpu_get_venc_hw_capa(9)
• vpu_load_firmware(9)
• vpu_mapping_dm_addr(9)

ngl bestie, that file path got cut off in the footer as ./drivers/media/platform/media..., so don't come for me about it 💅

okay and that's the page!! this one came from ./drivers/media/platform/media... and it's dated October 2026, so yeah — future vibes only 🔮💖 mwah, go read your kernel headers bestie 🧚✨