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| author | Michael S. Tsirkin <mst@redhat.com> | 2015-01-15 16:06:26 +0200 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2015-01-21 16:28:59 +1030 |
| commit | 46506da5f365efe7fe3e4c9da73ab679c0382fac (patch) | |
| tree | e8f11e77b344a635815b60968f4f694d3f60af93 /drivers/virtio | |
| parent | 0327642337fee1dba50fa4d9a45d3a8b8fb2d1c3 (diff) | |
| download | lwn-46506da5f365efe7fe3e4c9da73ab679c0382fac.tar.gz lwn-46506da5f365efe7fe3e4c9da73ab679c0382fac.zip | |
virtio_pci: add an option to disable legacy driver
Useful for testing device virtio 1 compatibility.
Based on patch by Rusty - couldn't resist putting
that flying car joke in there!
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/Kconfig | 19 | ||||
| -rw-r--r-- | drivers/virtio/Makefile | 3 | ||||
| -rw-r--r-- | drivers/virtio/virtio_pci_common.h | 10 |
3 files changed, 31 insertions, 1 deletions
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig index 083fb45950f5..b546da5d8ea3 100644 --- a/drivers/virtio/Kconfig +++ b/drivers/virtio/Kconfig @@ -19,6 +19,25 @@ config VIRTIO_PCI If unsure, say M. +config VIRTIO_PCI_LEGACY + bool "Support for legacy virtio draft 0.9.X and older devices" + default y + depends on VIRTIO_PCI + ---help--- + Virtio PCI Card 0.9.X Draft (circa 2014) and older device support. + + This option enables building a transitional driver, supporting + both devices conforming to Virtio 1 specification, and legacy devices. + If disabled, you get a slightly smaller, non-transitional driver, + with no legacy compatibility. + + So look out into your driveway. Do you have a flying car? If + so, you can happily disable this option and virtio will not + break. Otherwise, leave it set. Unless you're testing what + life will be like in The Future. + + If unsure, say Y. + config VIRTIO_BALLOON tristate "Virtio balloon driver" depends on VIRTIO diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile index bd230d1c0533..d85565b8ea46 100644 --- a/drivers/virtio/Makefile +++ b/drivers/virtio/Makefile @@ -1,5 +1,6 @@ obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o -virtio_pci-y := virtio_pci_modern.o virtio_pci_legacy.o virtio_pci_common.o +virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o +virtio_pci-$(CONFIG_VIRTIO_PCI_LEGACY) += virtio_pci_legacy.o obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h index d39180512761..28ee4e56badf 100644 --- a/drivers/virtio/virtio_pci_common.h +++ b/drivers/virtio/virtio_pci_common.h @@ -147,8 +147,18 @@ const char *vp_bus_name(struct virtio_device *vdev); */ int vp_set_vq_affinity(struct virtqueue *vq, int cpu); +#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY) int virtio_pci_legacy_probe(struct virtio_pci_device *); void virtio_pci_legacy_remove(struct virtio_pci_device *); +#else +static inline int virtio_pci_legacy_probe(struct virtio_pci_device *vp_dev) +{ + return -ENODEV; +} +static inline void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev) +{ +} +#endif int virtio_pci_modern_probe(struct virtio_pci_device *); void virtio_pci_modern_remove(struct virtio_pci_device *); |