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Subject: [PATCH] firmware: arm_scmi: Make virtio Version_1 compliance optional
Introduce a compilation option to disable strict enforcement of compliance against VirtIO Version_1 backends, so as to allow to support also Legacy VirtIO devices implementations. Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> --- drivers/firmware/arm_scmi/Kconfig | 14 ++++++++++++++ drivers/firmware/arm_scmi/virtio.c | 3 ++- 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig index 3d7081e84853..1e6c4659b640 100644 --- a/drivers/firmware/arm_scmi/Kconfig +++ b/drivers/firmware/arm_scmi/Kconfig @@ -77,6 +77,20 @@ config ARM_SCMI_TRANSPORT_VIRTIO If you want the ARM SCMI PROTOCOL stack to include support for a transport based on VirtIO, answer Y. +config ARM_SCMI_TRANSPORT_VIRTIO_VERSION1_COMPLIANCE + bool "SCMI VirtIO transport Version 1 compliance" + depends on ARM_SCMI_TRANSPORT_VIRTIO + default y + help + This enforces strict compliance with VirtIO Version 1 specification. + + If you want the ARM SCMI VirtIO transport layer to refuse to work + with Legacy VirtIO backends and instead support only VirtIO Version 1 + devices (or above), answer Y. + If you want instead to support also old Legacy VirtIO backends (like + the ones implemented by kvmtool) and let the core Kernel VirtIO layer + take care of the needed conversions, say N. + endif #ARM_SCMI_PROTOCOL config ARM_SCMI_POWER_DOMAIN diff --git a/drivers/firmware/arm_scmi/virtio.c b/drivers/firmware/arm_scmi/virtio.c index c8cab5652daf..bcfc4474535b 100644 --- a/drivers/firmware/arm_scmi/virtio.c +++ b/drivers/firmware/arm_scmi/virtio.c @@ -459,12 +459,13 @@ static void scmi_vio_remove(struct virtio_device *vdev) static int scmi_vio_validate(struct virtio_device *vdev) { +#ifdef CONFIG_ARM_SCMI_TRANSPORT_VIRTIO_VERSION1_COMPLIANCE if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { dev_err(&vdev->dev, "device does not comply with spec version 1.x\n"); return -EINVAL; } - +#endif return 0; } -- 2.17.1
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