POWERVR UAPI(9)

🌈 PowerVR UAPI 🌈

okay bestie, welcome to the PowerVR UAPI(9) page from the Kernel API Manual — this is the one about the PowerVR IOCTL argument structs and their whole alignment situation, and it is lowkey iconic in a very kernel-nerd way. 💅

So the PowerVR IOCTL argument structs have a few limitations in place, on top of the standard kernel restrictions, and they are non-negotiable, fr fr:

• All members must be type-aligned. every single member, no messy unaligned chaos allowed.
• The overall struct must be padded to 64-bit alignment.
• Explicit padding is almost always required. This takes the form of _padding_[x] members of sufficient size to pad to the next power-of-two alignment, where [x] is the offset into the struct in hexadecimal. Arrays are never used for alignment. Padding fields must be zeroed; this is always checked. 👀
• Unions may only appear as the last member of a struct.
• Individual union members may grow in the future. The space between the end of a union member and the end of its containing union is considered "implicit padding" and must be zeroed. This is always checked.

In addition to the IOCTL argument structs, the PowerVR UAPI makes use of DEV_QUERY argument structs. These are used to fetch information about the device and runtime. These structs are subject to the same rules set out above. periodt. ✨

🔗 SEE ALSO 🔗

the way this list ate, honestly — every single reference is here, bestie:

• Kernel file ./include/uapi/drm/pvr_drm.h
• struct drm_pvr_obj_array(9)
• DRM_PVR_OBJ_ARRAY(9)
• PowerVR IOCTL interface(9)
• PVR_IOCTL(9)
• PowerVR IOCTL DEV_QUERY interface(9)
• struct drm_pvr_dev_query_gpu_info(9)
• struct drm_pvr_dev_query_runtime_info(9)
• struct drm_pvr_dev_query_quirks(9)
• struct drm_pvr_dev_query_enhancements(9)
• enum drm_pvr_heap_id(9)
• struct drm_pvr_heap(9)
• struct drm_pvr_dev_query_heap_info(9)
• enum drm_pvr_static_data_area_usage(9)
• struct drm_pvr_static_data_area(9)
• struct drm_pvr_dev_query_static_data_areas(9)
• enum drm_pvr_dev_query(9)
• struct drm_pvr_ioctl_dev_query_args(9)
• PowerVR IOCTL CREATE_BO interface(9)
• Flags for CREATE_BO(9)
• struct drm_pvr_ioctl_create_bo_args(9)
• PowerVR IOCTL GET_BO_MMAP_OFFSET interface(9)
• struct drm_pvr_ioctl_get_bo_mmap_offset_args(9)
• PowerVR IOCTL CREATE_VM_CONTEXT and DESTROY_VM_CONTEXT interfaces(9)
• struct drm_pvr_ioctl_create_vm_context_args(9)
• struct drm_pvr_ioctl_destroy_vm_context_args(9)
• PowerVR IOCTL VM_MAP and VM_UNMAP interfaces(9)
• struct drm_pvr_ioctl_vm_map_args(9)
• struct drm_pvr_ioctl_vm_unmap_args(9)
• PowerVR IOCTL CREATE_CONTEXT and DESTROY_CONTEXT interfaces(9)
• enum drm_pvr_ctx_priority(9)
• enum drm_pvr_ctx_type(9)
• struct drm_pvr_ioctl_create_context_args(9)
• struct drm_pvr_ioctl_destroy_context_args(9)
• PowerVR IOCTL CREATE_FREE_LIST and DESTROY_FREE_LIST interfaces(9)
• struct drm_pvr_ioctl_create_free_list_args(9)
• struct drm_pvr_ioctl_destroy_free_list_args(9)
• PowerVR IOCTL CREATE_HWRT_DATASET and DESTROY_HWRT_DATASET interfaces(9)
• struct drm_pvr_create_hwrt_geom_data_args(9)
• struct drm_pvr_create_hwrt_rt_data_args(9)
• struct drm_pvr_ioctl_create_hwrt_dataset_args(9)
• struct drm_pvr_ioctl_destroy_hwrt_dataset_args(9)
• PowerVR IOCTL SUBMIT_JOBS interface(9)
• Flags for the drm_pvr_sync_op object.(9)
• struct drm_pvr_sync_op(9)
• Flags for SUBMIT_JOB ioctl geometry command.(9)
• Flags for SUBMIT_JOB ioctl fragment command.(9)
• Flags for SUBMIT_JOB ioctl compute command.(9)
• Flags for SUBMIT_JOB ioctl transfer command.(9)
• enum drm_pvr_job_type(9)
• struct drm_pvr_hwrt_data_ref(9)
• struct drm_pvr_job(9)
• struct drm_pvr_ioctl_submit_jobs_args(9)

source/version tea: ./include/uapi/drm; date tea: October 2026; manual name: PowerVR UAPI(9). that's the footer sign-off, mwah 💋✨🫶