[PATCH] scripts/dtc: dma-ranges is a multiple of 3 cells

[PATCH] scripts/dtc: dma-ranges is a multiple of 3 cells

[Ben Dooks]

The dma-ranges property is a set 3 cells of #address-size, so don't treat
it like the ranges property when generating warnings.

Signed-off-by: Ben Dooks <ben.dooks@sifive.com>
---
 scripts/dtc/checks.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/scripts/dtc/checks.c b/scripts/dtc/checks.c
index 781ba1129a8e..791b93e8e02a 100644
--- a/scripts/dtc/checks.c
+++ b/scripts/dtc/checks.c
@@ -823,7 +823,36 @@ static void check_ranges_format(struct check *c, struct dt_info *dti,
 	}
 }
 WARNING(ranges_format, check_ranges_format, "ranges", &addr_size_cells);
-WARNING(dma_ranges_format, check_ranges_format, "dma-ranges", &addr_size_cells);
+
+static void check_dma_ranges_format(struct check *c, struct dt_info *dti,
+				struct node *node)
+{
+	struct property *prop;
+	int c_size_cells, p_size_cells, entrylen;
+	const char *ranges = c->data;
+
+	prop = get_property(node, ranges);
+	if (!prop)
+		return;
+
+	if (!node->parent) {
+		FAIL_PROP(c, dti, node, prop, "Root node has a \"%s\" property",
+			  ranges);
+		return;
+	}
+
+	c_size_cells = node_size_cells(node);
+	p_size_cells = node_size_cells(node->parent);
+	entrylen = (p_size_cells + 2 * c_size_cells) * sizeof(cell_t);
+
+	if (!is_multiple_of(prop->val.len, entrylen)) {
+		FAIL_PROP(c, dti, node, prop, "\"%s\" property has invalid length (%d bytes) "
+			  "(parent #address-cells == %d, "
+			  "child #address-cells == %d)", ranges, prop->val.len,
+			  p_size_cells, c_size_cells);
+	}
+}
+WARNING(dma_ranges_format, check_dma_ranges_format, "dma-ranges", &addr_size_cells);
 
 static const struct bus_type pci_bus = {
 	.name = "PCI",
-- 
2.35.1

Re: [PATCH] scripts/dtc: dma-ranges is a multiple of 3 cells

[Rob Herring]

On Fri, Jul 8, 2022 at 11:04 AM Ben Dooks <ben.dooks@sifive.com> wrote:
>
> The dma-ranges property is a set 3 cells of #address-size, so don't treat
> it like the ranges property when generating warnings.

Uhh, no it is not. It's the same as 'ranges'.

Also, we don't take patches against the copy of dtc in the kernel.
Submit them to upstream dtc.

Rob


>
> Signed-off-by: Ben Dooks <ben.dooks@sifive.com>
> ---
>  scripts/dtc/checks.c | 31 ++++++++++++++++++++++++++++++-
>  1 file changed, 30 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/dtc/checks.c b/scripts/dtc/checks.c
> index 781ba1129a8e..791b93e8e02a 100644
> --- a/scripts/dtc/checks.c
> +++ b/scripts/dtc/checks.c
> @@ -823,7 +823,36 @@ static void check_ranges_format(struct check *c, struct dt_info *dti,
>         }
>  }
>  WARNING(ranges_format, check_ranges_format, "ranges", &addr_size_cells);
> -WARNING(dma_ranges_format, check_ranges_format, "dma-ranges", &addr_size_cells);
> +
> +static void check_dma_ranges_format(struct check *c, struct dt_info *dti,
> +                               struct node *node)
> +{
> +       struct property *prop;
> +       int c_size_cells, p_size_cells, entrylen;
> +       const char *ranges = c->data;
> +
> +       prop = get_property(node, ranges);
> +       if (!prop)
> +               return;
> +
> +       if (!node->parent) {
> +               FAIL_PROP(c, dti, node, prop, "Root node has a \"%s\" property",
> +                         ranges);
> +               return;
> +       }
> +
> +       c_size_cells = node_size_cells(node);
> +       p_size_cells = node_size_cells(node->parent);
> +       entrylen = (p_size_cells + 2 * c_size_cells) * sizeof(cell_t);
> +
> +       if (!is_multiple_of(prop->val.len, entrylen)) {
> +               FAIL_PROP(c, dti, node, prop, "\"%s\" property has invalid length (%d bytes) "
> +                         "(parent #address-cells == %d, "
> +                         "child #address-cells == %d)", ranges, prop->val.len,
> +                         p_size_cells, c_size_cells);
> +       }
> +}
> +WARNING(dma_ranges_format, check_dma_ranges_format, "dma-ranges", &addr_size_cells);
>
>  static const struct bus_type pci_bus = {
>         .name = "PCI",
> --
> 2.35.1
>