When disabling SMMU, it may fail to allocate large continuous memory. This
patch fixes this by allocating memory as blocks.
Signed-off-by: NZhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: NShukun Tan <tanshukun1@huawei.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>