Function vkGetQueryPoolResults 

pub unsafe extern "system" fn vkGetQueryPoolResults(
    device: VkDevice,
    queryPool: VkQueryPool,
    firstQuery: u32,
    queryCount: u32,
    dataSize: usize,
    pData: *mut c_void,
    stride: VkDeviceSize,
    flags: VkQueryResultFlags,
) -> VkResult

Available if built with exported-prototypes.