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Add functions which migrate to / from VRAM accepting a single DPA argument (VRAM) and array of dma addresses (SRAM). Used for SVM migrations. v2: - Don't unlock job_mutex in error path of xe_migrate_vram v3: - Kernel doc (Thomas) - Better commit message (Thomas) - s/dword/num_dword (Thomas) - Return error on to large of migration (Thomas) Signed-off-by: Oak Zeng <oak.zeng@intel.com> Signed-off-by: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20250306012657.3505757-21-matthew.brost@intel.com