ENUM RISCV_IOMMU_HPMEVENT_ID(9)

✨ NAME ✨

enum riscv_iommu_hpmevent_id — the performance-monitoring event identifier, bestie 💅

Ok so real talk, this is the enum that tells the RISC-V IOMMU which performance event you're counting. Every counter you point at one of these and it's like "okay girl, I'll track that for you" ✨

🌸 SYNOPSIS 🌸

enum riscv_iommu_hpmevent_id {
    RISCV_IOMMU_HPMEVENT_INVALID ,
    RISCV_IOMMU_HPMEVENT_URQ ,
    RISCV_IOMMU_HPMEVENT_TRQ ,
    RISCV_IOMMU_HPMEVENT_ATS_RQ ,
    RISCV_IOMMU_HPMEVENT_TLB_MISS ,
    RISCV_IOMMU_HPMEVENT_DD_WALK ,
    RISCV_IOMMU_HPMEVENT_PD_WALK ,
    RISCV_IOMMU_HPMEVENT_S_VS_WALKS ,
    RISCV_IOMMU_HPMEVENT_G_WALKS ,
    RISCV_IOMMU_HPMEVENT_MAX

};

💖 Constants 💖

Like, here's the whole roster, no gatekeeping 🫶

• RISCV_IOMMU_HPMEVENT_INVALID — the "nah, don't count anything" event. Invalid, literally do not count, it's giving placeholder energy 🙈
• RISCV_IOMMU_HPMEVENT_URQ — untranslated requests 👑
• RISCV_IOMMU_HPMEVENT_TRQ — translated requests 💫
• RISCV_IOMMU_HPMEVENT_ATS_RQ — ATS translation requests 🦋
• RISCV_IOMMU_HPMEVENT_TLB_MISS — TLB misses 😭 (and yeah, there will be a lot of them)
• RISCV_IOMMU_HPMEVENT_DD_WALK — device directory walks 🚶‍♀️
• RISCV_IOMMU_HPMEVENT_PD_WALK — process directory walks 🚶‍♀️🚶‍♀️
• RISCV_IOMMU_HPMEVENT_S_VS_WALKS — first-stage page table walks, our main character ✨
• RISCV_IOMMU_HPMEVENT_G_WALKS — second-stage page table walks, the sequel 🎬
• RISCV_IOMMU_HPMEVENT_MAX — the sentinel value that denotes the maximum Event IDs, iykyk 🎀

🦋 SEE ALSO 🦋

Kernel file ./drivers/iommu/riscv/iommu-bits.h ⭐ and the whole enum friend group, fr fr:

enum riscv_iommu_igs_settings(9), enum riscv_iommu_ddtp_modes(9), struct riscv_iommu_dc(9), enum riscv_iommu_dc_iohgatp_modes(9), enum riscv_iommu_dc_fsc_atp_modes(9), struct riscv_iommu_pc(9), struct riscv_iommu_command(9), struct riscv_iommu_fq_record(9), enum riscv_iommu_fq_causes(9), enum riscv_iommu_fq_ttypes(9), struct riscv_iommu_pq_record(9), struct riscv_iommu_msipte(9)

Lowkey obsessed with this one, ngl. Go read the whole squad 💜

That's the whole vibe check, bestie 🧚 this came from ./drivers/iommu/riscv, dated October 2026, and it's the enum riscv_i..._hpmevent_id(9) page — slay, go count some events 💅🌸