On Sun, Jul 14, 2024 at 3:44 AM Daniel Henrique Barboza
<dbarb...@ventanamicro.com> wrote:
>
> Commit b1f1e9dcfa renamed 'riscv,delegate' to 'riscv,delegation' since
> it is the correct name as per dt-bindings, and the absence of the
> correct name will result in validation fails when dumping the dtb and
> using dt-validate.
>
> But this change has a side-effect: every other firmware available that
> is AIA capable is using 'riscv,delegate', and it will fault/misbehave if
> this property isn't present. The property was added back in QEMU 7.0,
> meaning we have 2 years of firmware development using the wrong
> property.
>
> Re-introducing 'riscv,delegate' while keeping 'riscv,delegation' will
> make current firmwares to keep booting with the 'virt' machine and
> dt-validate won't complain about it since we're still using the expected
> property 'riscv,delegation'. 'riscv,delegate' is then marked for future
> deprecation and its use is being discouraged.
>
> Cc: Conor Dooley <co...@kernel.org>
> Cc: Anup Patel <apa...@ventanamicro.com>
> Fixes: b1f1e9dcfa ("hw/riscv/virt.c: aplic DT: rename prop to 'riscv,
> delegation'")
> Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.fran...@wdc.com>
Alistair
> ---
> docs/about/deprecated.rst | 11 +++++++++++
> hw/riscv/virt.c | 9 +++++++++
> 2 files changed, 20 insertions(+)
>
> diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
> index 20b7a17cf0..88f0f03786 100644
> --- a/docs/about/deprecated.rst
> +++ b/docs/about/deprecated.rst
> @@ -479,6 +479,17 @@ versions, aliases will point to newer CPU model versions
> depending on the machine type, so management software must
> resolve CPU model aliases before starting a virtual machine.
>
> +RISC-V "virt" board "riscv,delegate" DT property (since 9.1)
> +''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
> +
> +The "riscv,delegate" DT property was added in QEMU 7.0 as part of
> +the AIA APLIC support. The property changed name during the review
> +process in Linux and the correct name ended up being
> +"riscv,delegation". Changing the DT property name will break all
> +available firmwares that are using the current (wrong) name. The
> +property is kept as is in 9.1, together with "riscv,delegation", to
> +give more time for firmware developers to change their code.
> +
> Migration
> ---------
>
> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> index bc0893e087..9981e0f6c9 100644
> --- a/hw/riscv/virt.c
> +++ b/hw/riscv/virt.c
> @@ -651,6 +651,15 @@ static void create_fdt_one_aplic(RISCVVirtState *s, int
> socket,
> qemu_fdt_setprop_cells(ms->fdt, aplic_name, "riscv,delegation",
> aplic_child_phandle, 0x1,
> VIRT_IRQCHIP_NUM_SOURCES);
> + /*
> + * DEPRECATED_9.1: Compat property kept temporarily
> + * to allow old firmwares to work with AIA. Do *not*
> + * use 'riscv,delegate' in new code: use
> + * 'riscv,delegation' instead.
> + */
> + qemu_fdt_setprop_cells(ms->fdt, aplic_name, "riscv,delegate",
> + aplic_child_phandle, 0x1,
> + VIRT_IRQCHIP_NUM_SOURCES);
> }
>
> riscv_socket_fdt_write_id(ms, aplic_name, socket);
> --
> 2.45.2
>
>
