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firmware: arm_scmi: Make virtio Version_1 compliance optional

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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.

Link: https://lore.kernel.org/r/20211115102910.7639-1-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi
2021-11-15 10:29:10 +00:00
committed by Sudeep Holla
parent 5f90f189a0
commit 530897ecdb
2 changed files with 17 additions and 1 deletions
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15
drivers/firmware/arm_scmi/Kconfig
View File

@@ -89,6 +89,21 @@ 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

3
drivers/firmware/arm_scmi/virtio.c
View File

@@ -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;
}