Re: [PATCH v2 3/4] hw/riscv: virt: fix syscon subnode paths

[Jessica Clarke <jrtc27@jrtc27.com>]

On 8 Aug 2022, at 22:06, Conor Dooley <mail@conchuod.ie> wrote:
> 
> From: Conor Dooley <conor.dooley@microchip.com>
> 
> The subnodes of the syscon have been added to the incorrect paths.
> Rather than add them as subnodes, they were originally added to "/foo"
> and a later patch moved them to "/soc/foo". Both are incorrect & they
> should have been added as "/soc/test@###/foo" as "/soc/test" is the
> syscon node. Fix both the reboot and poweroff subnodes to avoid errors
> such as:
> 
> /stuff/qemu/qemu.dtb: soc: poweroff: {'value': [[21845]], 'offset': [[0]], 'regmap': [[4]], 'compatible': ['syscon-poweroff']} should not be valid under {'type': 'object'}
>        From schema: /home/conor/.local/lib/python3.9/site-packages/dtschema/schemas/simple-bus.yaml
> /stuff/qemu/qemu.dtb: soc: reboot: {'value': [[30583]], 'offset': [[0]], 'regmap': [[4]], 'compatible': ['syscon-reboot']} should not be valid under {'type': 'object'}
>        From schema: /home/conor/.local/lib/python3.9/site-packages/dtschema/schemas/simple-bus.yaml
> 
> Reported-by: Rob Herring <robh@kernel.org>
> Link: https://lore.kernel.org/linux-riscv/20220803170552.GA2250266-robh@kernel.org/
> Fixes: 18df0b4695 ("hw/riscv: virt: Allow creating multiple NUMA sockets")
> Fixes: 0e404da007 ("riscv/virt: Add syscon reboot and poweroff DT nodes")
> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

This breaks FreeBSD’s driver (well, it just won’t probe/attach), which
is written to handle syscon-poweroff/reboot existing as a child of a
simplebus not a syscon. Moreover, what is the point of regmap in this
case? Its existence suggests the point is for them to *not* be children
of the syscon, otherwise you wouldn’t need an explicit phandle, you’d
just look at the parent. Moving the nodes whilst keeping the property
doesn’t make sense to me.

Jess

> ---
> hw/riscv/virt.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> index 8b2978076e..a98b054545 100644
> --- a/hw/riscv/virt.c
> +++ b/hw/riscv/virt.c
> @@ -896,7 +896,8 @@ static void create_fdt_reset(RISCVVirtState *s, const MemMapEntry *memmap,
>     test_phandle = qemu_fdt_get_phandle(mc->fdt, name);
>     g_free(name);
> 
> -    name = g_strdup_printf("/soc/reboot");
> +    name = g_strdup_printf("/soc/test@%lx/reboot",
> +        (long)memmap[VIRT_TEST].base);
>     qemu_fdt_add_subnode(mc->fdt, name);
>     qemu_fdt_setprop_string(mc->fdt, name, "compatible", "syscon-reboot");
>     qemu_fdt_setprop_cell(mc->fdt, name, "regmap", test_phandle);
> @@ -904,7 +905,8 @@ static void create_fdt_reset(RISCVVirtState *s, const MemMapEntry *memmap,
>     qemu_fdt_setprop_cell(mc->fdt, name, "value", FINISHER_RESET);
>     g_free(name);
> 
> -    name = g_strdup_printf("/soc/poweroff");
> +    name = g_strdup_printf("/soc/test@%lx/poweroff",
> +        (long)memmap[VIRT_TEST].base);
>     qemu_fdt_add_subnode(mc->fdt, name);
>     qemu_fdt_setprop_string(mc->fdt, name, "compatible", "syscon-poweroff");
>     qemu_fdt_setprop_cell(mc->fdt, name, "regmap", test_phandle);
> -- 
> 2.37.1
> 
> 
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