[PATCH rdma-next 5/5] IB/mlx5: Add mmap support for VAR

[Leon Romanovsky <leon@kernel.org>]

From: Yishai Hadas <yishaih@mellanox.com>

Add mmap support for VAR, it uses the 'offset' command mode with
involvement of IB core APIs to find the previously allocated mmap entry.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
 drivers/infiniband/hw/mlx5/main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 873480b07686..52bc86ab9490 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -2253,7 +2253,10 @@ static int mlx5_ib_mmap_offset(struct mlx5_ib_dev *dev,
 
 	mentry = to_mmmap(entry);
 	pfn = (mentry->address >> PAGE_SHIFT);
-	prot = pgprot_writecombine(vma->vm_page_prot);
+	if (mentry->mmap_flag == MLX5_IB_MMAP_TYPE_VAR)
+		prot = pgprot_noncached(vma->vm_page_prot);
+	else
+		prot = pgprot_writecombine(vma->vm_page_prot);
 	ret = rdma_user_mmap_io(ucontext, vma, pfn,
 				entry->npages * PAGE_SIZE,
 				prot,
-- 
2.20.1