1 files changed, 54 insertions, 10 deletions

diff --git a/drivers/infiniband/hw/mlx5/devx.c b/drivers/infiniband/hw/mlx5/devx.c
index de3c2fc6f361..17ab369efc5e 100644
--- a/drivers/infiniband/hw/mlx5/devx.c
+++ b/drivers/infiniband/hw/mlx5/devx.c
@@ -2185,27 +2185,69 @@ static int devx_umem_get(struct mlx5_ib_dev *dev, struct ib_ucontext *ucontext,
 	return 0;
 }
 
+static unsigned int devx_umem_find_best_pgsize(struct ib_umem *umem,
+					       unsigned long pgsz_bitmap)
+{
+	unsigned long page_size;
+
+	/* Don't bother checking larger page sizes as offset must be zero and
+	 * total DEVX umem length must be equal to total umem length.
+	 */
+	pgsz_bitmap &= GENMASK_ULL(max_t(u64, order_base_2(umem->length),
+					 PAGE_SHIFT),
+				   MLX5_ADAPTER_PAGE_SHIFT);
+	if (!pgsz_bitmap)
+		return 0;
+
+	page_size = ib_umem_find_best_pgoff(umem, pgsz_bitmap, U64_MAX);
+	if (!page_size)
+		return 0;
+
+	/* If the page_size is less than the CPU page size then we can use the
+	 * offset and create a umem which is a subset of the page list.
+	 * For larger page sizes we can't be sure the DMA  list reflects the
+	 * VA so we must ensure that the umem extent is exactly equal to the
+	 * page list. Reduce the page size until one of these cases is true.
+	 */
+	while ((ib_umem_dma_offset(umem, page_size) != 0 ||
+		(umem->length % page_size) != 0) &&
+		page_size > PAGE_SIZE)
+		page_size /= 2;
+
+	return page_size;
+}
+
 static int devx_umem_reg_cmd_alloc(struct mlx5_ib_dev *dev,
 				   struct uverbs_attr_bundle *attrs,
 				   struct devx_umem *obj,
 				   struct devx_umem_reg_cmd *cmd)
 {
+	unsigned long pgsz_bitmap;
 	unsigned int page_size;
 	__be64 *mtt;
 	void *umem;
+	int ret;
 
 	/*
-	 * We don't know what the user intends to use this umem for, but the HW
-	 * restrictions must be met. MR, doorbell records, QP, WQ and CQ all
-	 * have different requirements. Since we have no idea how to sort this
-	 * out, only support PAGE_SIZE with the expectation that userspace will
-	 * provide the necessary alignments inside the known PAGE_SIZE and that
-	 * FW will check everything.
+	 * If the user does not pass in pgsz_bitmap then the user promises not
+	 * to use umem_offset!=0 in any commands that allocate on top of the
+	 * umem.
+	 *
+	 * If the user wants to use a umem_offset then it must pass in
+	 * pgsz_bitmap which guides the maximum page size and thus maximum
+	 * object alignment inside the umem. See the PRM.
+	 *
+	 * Users are not allowed to use IOVA here, mkeys are not supported on
+	 * umem.
 	 */
-	page_size = ib_umem_find_best_pgoff(
-		obj->umem, PAGE_SIZE,
-		__mlx5_page_offset_to_bitmask(__mlx5_bit_sz(umem, page_offset),
-					      0));
+	ret = uverbs_get_const_default(&pgsz_bitmap, attrs,
+			MLX5_IB_ATTR_DEVX_UMEM_REG_PGSZ_BITMAP,
+			GENMASK_ULL(63,
+				    min(PAGE_SHIFT, MLX5_ADAPTER_PAGE_SHIFT)));
+	if (ret)
+		return ret;
+
+	page_size = devx_umem_find_best_pgsize(obj->umem, pgsz_bitmap);
 	if (!page_size)
 		return -EINVAL;
 
@@ -2791,6 +2833,8 @@ DECLARE_UVERBS_NAMED_METHOD(
 			   UA_MANDATORY),
 	UVERBS_ATTR_FLAGS_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_ACCESS,
 			     enum ib_access_flags),
+	UVERBS_ATTR_CONST_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_PGSZ_BITMAP,
+			     u64),
 	UVERBS_ATTR_PTR_OUT(MLX5_IB_ATTR_DEVX_UMEM_REG_OUT_ID,
 			    UVERBS_ATTR_TYPE(u32),
 			    UA_MANDATORY));