Add the CONFIG_PCI symbol due a change in kernel 5.0 [1].
The option was previously enabled by default (default y).
"PCI: consolidate PCI config entry in drivers/pci
There is no good reason to duplicate the PCI menu in every architecture.
Instead provide a selectable HAVE_PCI symbol that indicates availability
of PCI support, and a FORCE_PCI symbol to for PCI on and the handle the
rest in drivers/pci."
Qemu aarch64 provide a PCIe Host bridge but it require CONFIG_PCI_HOST_GENERIC
enabled in the kernel.
With CONFIG_PCI_HOST_GENERIC enabled PCIe host bridge is detected:
$ dmesg
pci-host-generic 4010000000.pcie: host bridge /pcie@10000000 ranges:
pci-host-generic 4010000000.pcie: IO 0x3eff0000..0x3effffff -> 0x00000000
pci-host-generic 4010000000.pcie: MEM 0x10000000..0x3efeffff -> 0x10000000
pci-host-generic 4010000000.pcie: MEM 0x8000000000..0xffffffffff -> 0x8000000000
pci-host-generic 4010000000.pcie: ECAM at [mem 0x4010000000-0x401fffffff] for [bus 00-ff]
pci-host-generic 4010000000.pcie: PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [bus 00-ff]
pci_bus 0000:00: root bus resource [io 0x0000-0xffff]
pci_bus 0000:00: root bus resource [mem 0x10000000-0x3efeffff]
pci_bus 0000:00: root bus resource [mem 0x8000000000-0xffffffffff]
pci 0000:00:00.0: [1b36:0008] type 00 class 0x060000
$ lspci
00:00.0 Host bridge: Red Hat, Inc. QEMU PCIe Host bridge
[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=eb01d42a77785ff96b6e66a2a2e7027fc6d78e4a
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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