68f5d3f3b6
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>
55 lines
1.6 KiB
Makefile
55 lines
1.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux,intel}.com)
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#
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# Don't instrument UML-specific code; without this, we may crash when
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# accessing the instrumentation buffer for the first time from the
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# kernel.
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KCOV_INSTRUMENT := n
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CPPFLAGS_vmlinux.lds := -DSTART=$(LDS_START) \
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-DELF_ARCH=$(LDS_ELF_ARCH) \
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-DELF_FORMAT=$(LDS_ELF_FORMAT) \
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$(LDS_EXTRA)
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extra-y := vmlinux.lds
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obj-y = config.o exec.o exitcode.o irq.o ksyms.o mem.o \
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physmem.o process.o ptrace.o reboot.o sigio.o \
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signal.o syscall.o sysrq.o time.o tlb.o trap.o \
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um_arch.o umid.o maccess.o kmsg_dump.o skas/
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obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
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obj-$(CONFIG_GPROF) += gprof_syms.o
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-$(CONFIG_GENERIC_PCI_IOMAP) += ioport.o
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USER_OBJS := config.o
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include arch/um/scripts/Makefile.rules
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targets := config.c config.tmp
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# Be careful with the below Sed code - sed is pitfall-rich!
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# We use sed to lower build requirements, for "embedded" builders for instance.
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$(obj)/config.tmp: $(objtree)/.config FORCE
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$(call if_changed,quote1)
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quiet_cmd_quote1 = QUOTE $@
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cmd_quote1 = sed -e 's/"/\\"/g' -e 's/^/"/' -e 's/$$/\\n",/' \
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$< > $@
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$(obj)/config.c: $(src)/config.c.in $(obj)/config.tmp FORCE
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$(call if_changed,quote2)
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quiet_cmd_quote2 = QUOTE $@
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cmd_quote2 = sed -e '/CONFIG/{' \
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-e 's/"CONFIG"//' \
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-e 'r $(obj)/config.tmp' \
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-e 'a \' \
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-e '""' \
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-e '}' \
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$< > $@
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