AMDGPU_VM_PAGE_READABLE
uint32_t mapping_flags = AMDGPU_VM_PAGE_READABLE |
AMDGPU_VM_PAGE_READABLE | AMDGPU_VM_PAGE_WRITEABLE |
AMDGPU_VM_PAGE_READABLE | AMDGPU_VM_MTYPE_UC);
if (!(mapping->flags & AMDGPU_VM_PAGE_READABLE))