Re: [RFC PATCH 1/5] device_tree: Add qemu_fdt_add_path

[Andrew Jones]

Hi Ying Fang,

I don't see any change in this patch from what I have in my
tree, so this should be

 From: Andrew Jones <drjones@redhat.com>

Thanks,
drew

On Thu, Feb 25, 2021 at 04:56:23PM +0800, Ying Fang wrote:
> qemu_fdt_add_path() works like qemu_fdt_add_subnode(), except
> it also adds any missing parent nodes. We also tweak an error
> message of qemu_fdt_add_subnode().
> 
> Signed-off-by: Andrew Jones <drjones@redhat.com>
> Signed-off-by: Ying Fang <fangying1@huawei.com>
> ---
>  include/sysemu/device_tree.h |  1 +
>  softmmu/device_tree.c        | 45 ++++++++++++++++++++++++++++++++++--
>  2 files changed, 44 insertions(+), 2 deletions(-)
> 
> diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h
> index 982c89345f..15fb98af98 100644
> --- a/include/sysemu/device_tree.h
> +++ b/include/sysemu/device_tree.h
> @@ -104,6 +104,7 @@ uint32_t qemu_fdt_get_phandle(void *fdt, const char 
> *path);
>  uint32_t qemu_fdt_alloc_phandle(void *fdt);
>  int qemu_fdt_nop_node(void *fdt, const char *node_path);
>  int qemu_fdt_add_subnode(void *fdt, const char *name);
> +int qemu_fdt_add_path(void *fdt, const char *path);
>  
>  #define qemu_fdt_setprop_cells(fdt, node_path, property, ...)                
>  \
>      do {                                                                     
>  \
> diff --git a/softmmu/device_tree.c b/softmmu/device_tree.c
> index b9a3ddc518..1e3857ca0c 100644
> --- a/softmmu/device_tree.c
> +++ b/softmmu/device_tree.c
> @@ -515,8 +515,8 @@ int qemu_fdt_add_subnode(void *fdt, const char *name)
>  
>      retval = fdt_add_subnode(fdt, parent, basename);
>      if (retval < 0) {
> -        error_report("FDT: Failed to create subnode %s: %s", name,
> -                     fdt_strerror(retval));
> +        error_report("%s: Failed to create subnode %s: %s",
> +                     __func__, name, fdt_strerror(retval));
>          exit(1);
>      }
>  
> @@ -524,6 +524,47 @@ int qemu_fdt_add_subnode(void *fdt, const char *name)
>      return retval;
>  }
>  
> +/*
> + * Like qemu_fdt_add_subnode(), but will add all missing
> + * subnodes in the path.
> + */
> +int qemu_fdt_add_path(void *fdt, const char *path)
> +{
> +    char *dupname, *basename, *p;
> +    int parent, retval = -1;
> +
> +    if (path[0] != '/') {
> +        return retval;
> +    }
> +
> +    parent = fdt_path_offset(fdt, "/");
> +    p = dupname = g_strdup(path);
> +
> +    while (p) {
> +        *p = '/';
> +        basename = p + 1;
> +        p = strchr(p + 1, '/');
> +        if (p) {
> +            *p = '\0';
> +        }
> +        retval = fdt_path_offset(fdt, dupname);
> +        if (retval < 0 && retval != -FDT_ERR_NOTFOUND) {
> +            error_report("%s: Invalid path %s: %s",
> +                         __func__, path, fdt_strerror(retval));
> +            exit(1);
> +        } else if (retval == -FDT_ERR_NOTFOUND) {
> +            retval = fdt_add_subnode(fdt, parent, basename);
> +            if (retval < 0) {
> +                break;
> +            }
> +        }
> +        parent = retval;
> +    }
> +
> +    g_free(dupname);
> +    return retval;
> +}
> +
>  void qemu_fdt_dumpdtb(void *fdt, int size)
>  {
>      const char *dumpdtb = current_machine->dumpdtb;
> -- 
> 2.23.0
> 
>