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authorJohannes Berg <johannes.berg@intel.com>2021-03-05 13:19:58 +0100
committerRichard Weinberger <richard@nod.at>2021-06-17 21:45:43 +0200
commit68f5d3f3b6543266b29e047cfaf9842333019b4c (patch)
tree29590aaf2cbe0669962f23576c3a0b106327aba9 /arch/um/drivers/Makefile
parentum: irqs: allow invoking time-travel handler multiple times (diff)
downloadlinux-68f5d3f3b6543266b29e047cfaf9842333019b4c.tar.xz
linux-68f5d3f3b6543266b29e047cfaf9842333019b4c.zip
um: add PCI over virtio emulation driver
To support testing of PCI/PCIe drivers in UML, add a PCI bus support driver. This driver uses virtio, which in UML is really just vhost-user, to talk to devices, and adds the devices to the virtual PCI bus in the system. Since virtio already allows DMA/bus mastering this really isn't all that hard, of course we need the logic_iomem infrastructure that was added by a previous patch. The protocol to talk to the device is has a few fairly simple messages for reading to/writing from config and IO spaces, and messages for the device to send the various interrupts (INT#, MSI/MSI-X and while suspended PME#). Note that currently no offical virtio device ID is assigned for this protocol, as a consequence this patch requires defining it in the Kconfig, with a default that makes the driver refuse to work at all. Finally, in order to add support for MSI/MSI-X interrupts, some small changes are needed in the UML IRQ code, it needs to have more interrupts, changing NR_IRQS from 64 to 128 if this driver is enabled, but not actually use them for anything so that the generic IRQ domain/MSI infrastructure can allocate IRQ numbers. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/drivers/Makefile')
-rw-r--r--arch/um/drivers/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
index dcc64a02f81f..803666e85414 100644
--- a/arch/um/drivers/Makefile
+++ b/arch/um/drivers/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_user.o
obj-$(CONFIG_UML_RANDOM) += random.o
obj-$(CONFIG_VIRTIO_UML) += virtio_uml.o
obj-$(CONFIG_UML_RTC) += rtc.o
+obj-$(CONFIG_UML_PCI_OVER_VIRTIO) += virt-pci.o
# pcap_user.o must be added explicitly.
USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o vector_user.o