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>
40 lines
864 B
C
40 lines
864 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __ASM_UM_PCI_H
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#define __ASM_UM_PCI_H
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#include <linux/types.h>
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#include <asm/io.h>
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#define PCIBIOS_MIN_IO 0
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#define PCIBIOS_MIN_MEM 0
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#define pcibios_assign_all_busses() 1
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extern int isa_dma_bridge_buggy;
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#ifdef CONFIG_PCI
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static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
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{
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/* no legacy IRQs */
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_PCI_DOMAINS
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static inline int pci_proc_domain(struct pci_bus *bus)
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{
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/* always show the domain in /proc */
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return 1;
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}
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#endif /* CONFIG_PCI */
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#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
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/*
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* This is a bit of an annoying hack, and it assumes we only have
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* the virt-pci (if anything). Which is true, but still.
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*/
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void *pci_root_bus_fwnode(struct pci_bus *bus);
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#define pci_root_bus_fwnode pci_root_bus_fwnode
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#endif
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#endif /* __ASM_UM_PCI_H */
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