Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/gi…

…t/mst/vhost Pull vdpa fix from Michael Tsirkin: "A single mlx bugfix" * tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: vdpa/mlx5: Fix memory key MTT population
mariux64 · Feb 2, 2021 · 2e02677 · 2e02677
2 parents a992562 + 710eb8e
commit 2e02677
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Showing 2 changed files with 13 additions and 16 deletions.
diff --git a/drivers/vdpa/mlx5/core/mlx5_vdpa.h b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
@@ -15,6 +15,7 @@ struct mlx5_vdpa_direct_mr {
 	struct sg_table sg_head;
 	int log_size;
 	int nsg;
+	int nent;
 	struct list_head list;
 	u64 offset;
 };

diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
@@ -25,17 +25,6 @@ static int get_octo_len(u64 len, int page_shift)
 	return (npages + 1) / 2;
 }
 
-static void fill_sg(struct mlx5_vdpa_direct_mr *mr, void *in)
-{
-	struct scatterlist *sg;
-	__be64 *pas;
-	int i;
-
-	pas = MLX5_ADDR_OF(create_mkey_in, in, klm_pas_mtt);
-	for_each_sg(mr->sg_head.sgl, sg, mr->nsg, i)
-		(*pas) = cpu_to_be64(sg_dma_address(sg));
-}
-
 static void mlx5_set_access_mode(void *mkc, int mode)
 {
 	MLX5_SET(mkc, mkc, access_mode_1_0, mode & 0x3);
@@ -45,10 +34,18 @@ static void mlx5_set_access_mode(void *mkc, int mode)
 static void populate_mtts(struct mlx5_vdpa_direct_mr *mr, __be64 *mtt)
 {
 	struct scatterlist *sg;
+	int nsg = mr->nsg;
+	u64 dma_addr;
+	u64 dma_len;
+	int j = 0;
 	int i;
 
-	for_each_sg(mr->sg_head.sgl, sg, mr->nsg, i)
-		mtt[i] = cpu_to_be64(sg_dma_address(sg));
+	for_each_sg(mr->sg_head.sgl, sg, mr->nent, i) {
+		for (dma_addr = sg_dma_address(sg), dma_len = sg_dma_len(sg);
+		     nsg && dma_len;
+		     nsg--, dma_addr += BIT(mr->log_size), dma_len -= BIT(mr->log_size))
+			mtt[j++] = cpu_to_be64(dma_addr);
+	}
 }
 
 static int create_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr *mr)
@@ -64,7 +61,6 @@ static int create_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct
 		return -ENOMEM;
 
 	MLX5_SET(create_mkey_in, in, uid, mvdev->res.uid);
-	fill_sg(mr, in);
 	mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
 	MLX5_SET(mkc, mkc, lw, !!(mr->perm & VHOST_MAP_WO));
 	MLX5_SET(mkc, mkc, lr, !!(mr->perm & VHOST_MAP_RO));
@@ -276,8 +272,8 @@ static int map_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr
 done:
 	mr->log_size = log_entity_size;
 	mr->nsg = nsg;
-	err = dma_map_sg_attrs(dma, mr->sg_head.sgl, mr->nsg, DMA_BIDIRECTIONAL, 0);
-	if (!err)
+	mr->nent = dma_map_sg_attrs(dma, mr->sg_head.sgl, mr->nsg, DMA_BIDIRECTIONAL, 0);
+	if (!mr->nent)
 		goto err_map;
 
 	err = create_direct_mr(mvdev, mr);