RDMA/hns: Use dma_alloc_coherent() instead of kmalloc/dma_map_single()

mainline inclusion
from mainline-v5.15-rc5
commit 9a33f398
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QOTS
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/commit/?id=9a33f3980978e420672b0b54e3fa0c7908fd7c78

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

Replacing kmalloc/kfree/dma_map_single/dma_unmap_single() with
dma_alloc_coherent/dma_free_coherent() helps to reduce code size, and
simplify the code, and coherent DMA will not clear the cache every time.

The SOC that this driver supports does not have incoherent DMA, so this
makes the code follow the DMA API properly with no performance
impact. Currently there are missing dma sync calls around the DMA
transfers.

Link: https://lore.kernel.org/r/20210926061116.282-1-caihuoqing@baidu.comSigned-off-by: NCai Huoqing <caihuoqing@baidu.com>
Reviewed-by: NWenpeng Liang <liangwenpeng@huawei.com>
Tested-by: NWenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>
sigend-off-by: NGuofeng Yue <yueguofeng@hisilicon.com>
Reviewed-by: NYangyang Li <liyangyang20@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -1175,32 +1175,22 @@ static int hns_roce_alloc_cmq_desc(struct hns_roce_dev *hr_dev,
 {
 	int size = ring->desc_num * sizeof(struct hns_roce_cmq_desc);
 
-	ring->desc = kzalloc(size, GFP_KERNEL);
+	ring->desc = dma_alloc_coherent(hr_dev->dev, size,
+					&ring->desc_dma_addr, GFP_KERNEL);
 	if (!ring->desc)
 		return -ENOMEM;
 
-	ring->desc_dma_addr = dma_map_single(hr_dev->dev, ring->desc, size,
-					     DMA_BIDIRECTIONAL);
-	if (dma_mapping_error(hr_dev->dev, ring->desc_dma_addr)) {
-		ring->desc_dma_addr = 0;
-		kfree(ring->desc);
-		ring->desc = NULL;
-
-		return -ENOMEM;
-	}
-
 	return 0;
 }
 
 static void hns_roce_free_cmq_desc(struct hns_roce_dev *hr_dev,
 				   struct hns_roce_v2_cmq_ring *ring)
 {
-	dma_unmap_single(hr_dev->dev, ring->desc_dma_addr,
-			 ring->desc_num * sizeof(struct hns_roce_cmq_desc),
-			 DMA_BIDIRECTIONAL);
+	dma_free_coherent(hr_dev->dev,
+			  ring->desc_num * sizeof(struct hns_roce_cmq_desc),
+			  ring->desc, ring->desc_dma_addr);
 
 	ring->desc_dma_addr = 0;
-	kfree(ring->desc);
 }
 
 static int init_csq(struct hns_roce_dev *hr_dev,