mainline inclusion
from mainline-v5.1-rc1
commit e0100d40
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V
CVE: NA

--------------------------------

commit e0100d40 upstream.

Adding support for new feature on ioatdma 3.4 hardware that provides
descriptor pre-fetching in order to reduce small DMA latencies.
Signed-off-by: NDave Jiang <dave.jiang@intel.com>
Signed-off-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NLin Wang <lin.x.wang@intel.com>
Signed-off-by: NJackie Liu <liuyun01@kylinos.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>