[Pdbg] [PATCH 04/23] libpdbg: Add virtual node target

[Alistair Popple]

Reviewed-by: Alistair Popple <alistair at popple.id.au>

On Thursday, 19 September 2019 12:33:14 PM AEST Amitay Isaacs wrote:
> This is used to construct system device tree representation.
> 
> Currently there are multiple device trees for a system (e.g. P9) based
> on the backend where it's used.  This means one cannot refer to a hwunit
> by specific path which is independent of backend.
> 
> System device tree is a system representation that allows to identify
> hwunits uniquely by device tree path.  However, the backend device
> trees are still separate.  To avoid keeping two different device trees
> (system device tree and backend device tree) in memory, a system device
> tree view is created on top of the backend device tree.  This system
> device tree view is created using virtual nodes.  A virtual nodes
> denotes the attachment point for a hw-unit in a system device tree view.
> With multiple virtual nodes a system device tree view is overlaid on
> top of the backend device tree.
> 
> Signed-off-by: Amitay Isaacs <amitay at ozlabs.org>
> ---
>  libpdbg/target.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/libpdbg/target.h b/libpdbg/target.h
> index 2ecbf98..7e08ac3 100644
> --- a/libpdbg/target.h
> +++ b/libpdbg/target.h
> @@ -50,6 +50,7 @@ struct pdbg_target {
>  	bool probed;
>  	struct list_node class_link;
>  	void *priv;
> +	struct pdbg_target *vnode;
>  };
>  
>  struct pdbg_target *require_target_parent(struct pdbg_target *target);
>