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418807860e
Introduce the DRM_IOCTL_XE_VM_QUERY_MEMORY_RANGE_ATTRS ioctl to allow userspace to query memory attributes of VMAs within a user specified virtual address range. Userspace first calls the ioctl with num_mem_ranges = 0, sizeof_mem_ranges_attr = 0 and vector_of_vma_mem_attr = NULL to retrieve the number of memory ranges (vmas) and size of each memory range attribute. Then, it allocates a buffer of that size and calls the ioctl again to fill the buffer with memory range attributes. This two-step interface allows userspace to first query the required buffer size, then retrieve detailed attributes efficiently. v2 (Matthew Brost) - Use same ioctl to overload functionality v3 - Add kernel-doc v4 - Make uapi future proof by passing struct size (Matthew Brost) - make lock interruptible (Matthew Brost) - set reserved bits to zero (Matthew Brost) - s/__copy_to_user/copy_to_user (Matthew Brost) - Avod using VMA term in uapi (Thomas) - xe_vm_put(vm) is missing (Shuicheng) v5 - Nits - Fix kernel-doc Cc: Matthew Brost <matthew.brost@intel.com> Cc: Shuicheng Lin <shuicheng.lin@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Link: https://lore.kernel.org/r/20250821173104.3030148-21-himal.prasad.ghimiray@intel.com Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>