STRUCT IOMMU_HW_INFO_TEGRA241_CMDQV(9)

💖 NAME 💖

okay bestie, welcome to the Kernel API Manual page for struct iommu_hw_info_tegra241_cmdqv — NVIDIA Tegra241 CMDQV Hardware Information (IOMMU_HW_INFO_TYPE_TEGRA241_CMDQV). yes, the whole name is a mouthful, and no, we are not abbreviating it. periodt. 💅

✨ SYNOPSIS ✨

struct iommu_hw_info_tegra241_cmdqv {
    __u32 flags;
    __u8 version;
    __u8 log2vcmdqs;
    __u8 log2vsids;
    __u8 __reserved;
};

🎀 MEMBERS 🎀

• flags — must be 0. not optional-zero, not "eh close enough" zero. literally 0. no cap.
• version — the version number for the CMDQ-V HW, for PARAM bits[03:00]. it's giving "tiny field, important job" energy.
• log2vcmdqs — log2 of the total number of VCMDQs, for PARAM bits[07:04]. yes bestie, log2. math said pull up. 🧮✨
• log2vsids — log2 of the total number of SID replacements, for PARAM bits[15:12]. iconic little byte, honestly.
• __reserved — must be 0 too. don't try to be cute with it. 🙈

💅 DESCRIPTION 💅

so here's the tea: a VMM can use these fields directly in its emulated global PARAM register. main character struct behavior, fr fr. 🌟

and note this, bestie: only one Virtual Interface (VINTF) should be exposed to a VM. i.e. PARAM bits[11:08] should be set to 0 for log2 of the total number of VINTFs. that's the vibe check. don't overexpose the VINTFs. 💀

🌈 SEE ALSO 🌈

the Kernel file is ./include/uapi/linux/iommufd.h, and the whole IOMMU bestie cluster is right here — all of it, no skips, no crumbs:

• General ioctl format(9)
• struct iommu_destroy(9)
• struct iommu_ioas_alloc(9)
• struct iommu_iova_range(9)
• struct iommu_ioas_iova_ranges(9)
• struct iommu_ioas_allow_iovas(9)
• enum iommufd_ioas_map_flags(9)
• struct iommu_ioas_map(9)
• struct iommu_ioas_noiommu_get_pa(9)
• struct iommu_ioas_map_file(9)
• struct iommu_ioas_copy(9)
• struct iommu_ioas_unmap(9)
• enum iommufd_option(9)
• enum iommufd_option_ops(9)
• struct iommu_option(9)
• enum iommufd_vfio_ioas_op(9)
• struct iommu_vfio_ioas(9)
• enum iommufd_hwpt_alloc_flags(9)
• enum iommu_hwpt_vtd_s1_flags(9)
• struct iommu_hwpt_vtd_s1(9)
• struct iommu_hwpt_arm_smmuv3(9)
• struct iommu_hwpt_amd_guest(9)
• enum iommu_hwpt_data_type(9)
• struct iommu_hwpt_alloc(9)
• enum iommu_hw_info_vtd_flags(9)
• struct iommu_hw_info_vtd(9)
• enum iommu_hw_info_arm_smmuv3_flags(9)
• struct iommu_hw_info_arm_smmuv3(9)
• struct iommu_hw_info_amd(9)
• enum iommu_hw_info_type(9)
• enum iommufd_hw_capabilities(9)
• enum iommufd_hw_info_flags(9)
• struct iommu_hw_info(9)
• struct iommu_hwpt_set_dirty_tracking(9)
• enum iommufd_hwpt_get_dirty_bitmap_flags(9)
• struct iommu_hwpt_get_dirty_bitmap(9)
• enum iommu_hwpt_invalidate_data_type(9)
• enum iommu_hwpt_vtd_s1_invalidate_flags(9)
• struct iommu_hwpt_vtd_s1_invalidate(9)
• struct iommu_viommu_arm_smmuv3_invalidate(9)
• struct iommu_hwpt_invalidate(9)
• enum iommu_hwpt_pgfault_flags(9)
• enum iommu_hwpt_pgfault_perm(9)
• struct iommu_hwpt_pgfault(9)
• enum iommufd_page_response_code(9)
• struct iommu_hwpt_page_response(9)
• struct iommu_fault_alloc(9)
• enum iommu_viommu_type(9)
• struct iommu_viommu_tegra241_cmdqv(9)
• struct iommu_viommu_alloc(9)
• struct iommu_vdevice_alloc(9)
• struct iommu_ioas_change_process(9)
• enum iommu_veventq_flag(9)
• struct iommufd_vevent_header(9)
• enum iommu_veventq_type(9)
• struct iommu_vevent_arm_smmuv3(9)
• struct iommu_vevent_tegra241_cmdqv(9)
• struct iommu_veventq_alloc(9)
• enum iommu_hw_queue_type(9)
• struct iommu_hw_queue_alloc(9)

mwah 💋 — source ./include/uapi/linux, page version struct iomm...gra241_cmdqv(9), date October 2026. that's the whole Kernel API Manual moment, bestie. 🫶✨