IOCTL VALIDATION HELPERS(9)

💖 IOCTL validation helpers(9) 💖

Okay bestie, welcome to the Kernel API Manual page for IOCTL validation helpers(9) — section 9, very demure, very kernel. 💅

To validate the constraints imposed on IOCTL argument structs, a collection of macros and helper functions exists in pvr_device.h. That’s the whole squad, living together in one header. ✨

Of the current helpers, it should only be necessary to call PVR_IOCTL_UNION_PADDING_CHECK directly. This macro should be used once in every code path which extracts a union member from a struct passed from userspace. Periodt — every single path. 🫶

🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/imagination/pvr_device.h
• struct pvr_gpu_id(9)
• struct pvr_fw_version(9)
• struct pvr_device_data(9)
• struct pvr_device(9)
• struct pvr_file(9)
• PVR_HAS_FEATURE(9)
• PVR_FEATURE_VALUE(9)
• PVR_HAS_QUIRK(9)
• PVR_HAS_ENHANCEMENT(9)
• PVR_PACKED_BVNC(9)
• pvr_gpu_id_to_packed_bvnc(9)
• PVR_CR_FIELD_GET(9)
• pvr_cr_read32(9)
• pvr_cr_read64(9)
• pvr_cr_write32(9)
• pvr_cr_write64(9)
• pvr_cr_poll_reg32(9)
• pvr_cr_poll_reg64(9)
• pvr_round_up_to_cacheline_size(9)
• pvr_ioctl_union_padding_check(9)
• PVR_STATIC_ASSERT_64BIT_ALIGNED(9)
• PVR_IOCTL_UNION_PADDING_CHECK(9)

Mwah 💋 — source ./drivers/gpu/drm/imagination, date October 2026, and this cutie is IOCTL validation helpers(9). Stay slay, bestie. 🎀