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[pci] Separate permission to probe buses from bus:dev.fn range discovery

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The UEFI device model requires us to not probe the PCI bus directly,
but instead to wait to be offered the opportunity to drive devices via
our driver service binding handle.

We currently inhibit PCI bus probing by having pci_discover() return
an empty range when using the EFI PCI I/O API.  This has the unwanted
side effect that scanning the bus manually using the "pciscan" command
will also fail to discover any devices.

Separate out the concept of being allowed to probe PCI buses from the
mechanism for discovering PCI bus:dev.fn address ranges, so that this
limitation may be removed.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2024-08-15 08:46:41 +01:00
parent 9d9465b140
commit 7c82ff0b6b
14 changed files with 77 additions and 0 deletions
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1
src/arch/x86/interface/pcbios/pcibios.c
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@@ -120,6 +120,7 @@ int pcibios_write ( struct pci_device *pci, uint32_t command, uint32_t value ){
return ( status >> 8 );
}
PROVIDE_PCIAPI_INLINE ( pcbios, pci_can_probe );
PROVIDE_PCIAPI ( pcbios, pci_discover, pcibios_discover );
PROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_byte );
PROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_word );

1
src/arch/x86/interface/pcbios/pcicloud.c
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@@ -148,6 +148,7 @@ static void * pcicloud_ioremap ( struct pci_device *pci,
return pcicloud->pci_ioremap ( pci, bus_addr, len );
}
PROVIDE_PCIAPI_INLINE ( cloud, pci_can_probe );
PROVIDE_PCIAPI ( cloud, pci_discover, pcicloud_discover );
PROVIDE_PCIAPI ( cloud, pci_read_config_byte, pcicloud_read_config_byte );
PROVIDE_PCIAPI ( cloud, pci_read_config_word, pcicloud_read_config_word );