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[pci] Use runtime selectable PCI I/O API for EFI cloud builds

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On some systems (observed on an AWS m8g.medium instance in eu-west-2),
the UEFI firmware omits the PCI host bridge drivers for all but the
first PCI bus.  The observable result is that any devices on other PCI
buses (such as the ENA network device) are not enumerated by the UEFI
firmware and are therefore unusable by iPXE.

Support these systems by switching to using PCIAPI_CLOUD for EFI cloud
builds, trying the EFI PCI I/O API first and falling back to direct
access (via ECAM) for devices that the UEFI firmware has failed to
enumerate itself.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-11-24 20:27:53 +00:00
parent 9c1ac48bcf
commit dfea3bbfad
4 changed files with 18 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/config/cloud/ioapi.h
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@@ -8,3 +8,13 @@
#define PCIAPI_RUNTIME_PCBIOS #define PCIAPI_RUNTIME_PCBIOS
#define PCIAPI_RUNTIME_DIRECT #define PCIAPI_RUNTIME_DIRECT
#endif #endif
/* Work around missing PCI host bridge drivers in the cut-down UEFI found
* in some AWS EC2 instances.
*/
#ifdef PLATFORM_efi
#undef PCIAPI_EFI
#define PCIAPI_CLOUD
#define PCIAPI_RUNTIME_EFI
#define PCIAPI_RUNTIME_ECAM
#endif

3
src/config/config_pci.c
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@@ -45,3 +45,6 @@ REQUIRE_OBJECT ( pcibios );
#ifdef PCIAPI_RUNTIME_DIRECT #ifdef PCIAPI_RUNTIME_DIRECT
REQUIRE_OBJECT ( pcidirect ); REQUIRE_OBJECT ( pcidirect );
#endif #endif
#ifdef PCIAPI_RUNTIME_EFI
REQUIRE_OBJECT ( efi_pci );
#endif

7
src/include/ipxe/pci_io.h
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@@ -192,9 +192,10 @@ struct pci_api {
#endif #endif
/* PCI runtime selectable API priorities */ /* PCI runtime selectable API priorities */
#define PCIAPI_PRIORITY_ECAM 01 /**< ACPI ECAM */ #define PCIAPI_PRIORITY_EFI 01 /**< EFI PCI I/O protocols */
#define PCIAPI_PRIORITY_PCBIOS 02 /**< PCI BIOS calls */ #define PCIAPI_PRIORITY_ECAM 02 /**< ACPI ECAM */
#define PCIAPI_PRIORITY_DIRECT 03 /**< Direct Type 1 accesses */ #define PCIAPI_PRIORITY_PCBIOS 03 /**< PCI BIOS calls */
#define PCIAPI_PRIORITY_DIRECT 04 /**< Direct Type 1 accesses */
/** Provide a runtime selectable PCI I/O API */ /** Provide a runtime selectable PCI I/O API */
#define PROVIDE_PCIAPI_RUNTIME( subsys, priority ) \ #define PROVIDE_PCIAPI_RUNTIME( subsys, priority ) \

1
src/interface/efi/efi_pci.c
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@@ -436,6 +436,7 @@ PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_byte );
PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_word ); PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_word );
PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_dword ); PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_dword );
PROVIDE_PCIAPI ( efi, pci_ioremap, efipci_ioremap ); PROVIDE_PCIAPI ( efi, pci_ioremap, efipci_ioremap );
PROVIDE_PCIAPI_RUNTIME ( efi, PCIAPI_PRIORITY_EFI );
/****************************************************************************** /******************************************************************************
* *