diff options
| -rw-r--r-- | src/include/ipxe/acpi.h | 3 | ||||
| -rw-r--r-- | src/interface/efi/efi_pci.c | 72 |
2 files changed, 71 insertions, 4 deletions
diff --git a/src/include/ipxe/acpi.h b/src/include/ipxe/acpi.h index e41bd28..f979ace 100644 --- a/src/include/ipxe/acpi.h +++ b/src/include/ipxe/acpi.h @@ -78,6 +78,9 @@ struct acpi_qword_address_space_resource { /** A memory address space type */ #define ACPI_ADDRESS_TYPE_MEM 0x00 +/** A bus number address space type */ +#define ACPI_ADDRESS_TYPE_BUS 0x02 + /** An ACPI resource descriptor */ union acpi_resource { /** Tag byte */ diff --git a/src/interface/efi/efi_pci.c b/src/interface/efi/efi_pci.c index 6b32fd6..4adee0f 100644 --- a/src/interface/efi/efi_pci.c +++ b/src/interface/efi/efi_pci.c @@ -63,6 +63,70 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); */ /** + * Check for a matching PCI root bridge I/O protocol + * + * @v pci PCI device + * @v handle EFI PCI root bridge handle + * @v root EFI PCI root bridge I/O protocol + * @ret rc Return status code + */ +static int efipci_root_match ( struct pci_device *pci, EFI_HANDLE handle, + EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *root ) { + union { + union acpi_resource *res; + void *raw; + } u; + unsigned int segment = PCI_SEG ( pci->busdevfn ); + unsigned int bus = PCI_BUS ( pci->busdevfn ); + unsigned int start; + unsigned int end; + unsigned int tag; + EFI_STATUS efirc; + int rc; + + /* Check segment number */ + if ( root->SegmentNumber != segment ) + return -ENOENT; + + /* Get ACPI resource descriptors */ + if ( ( efirc = root->Configuration ( root, &u.raw ) ) != 0 ) { + rc = -EEFI ( efirc ); + DBGC ( pci, "EFIPCI " PCI_FMT " cannot get configuration for " + "%s: %s\n", PCI_ARGS ( pci ), + efi_handle_name ( handle ), strerror ( rc ) ); + return rc; + } + + /* Assume success if no bus number range descriptors are found */ + rc = 0; + + /* Parse resource descriptors */ + for ( ; ( ( tag = acpi_resource_tag ( u.res ) ) != ACPI_END_RESOURCE ) ; + u.res = acpi_resource_next ( u.res ) ) { + + /* Ignore anything other than a bus number range descriptor */ + if ( tag != ACPI_QWORD_ADDRESS_SPACE_RESOURCE ) + continue; + if ( u.res->qword.type != ACPI_ADDRESS_TYPE_BUS ) + continue; + + /* Check for a matching bus number */ + start = le64_to_cpu ( u.res->qword.min ); + end = ( start + le64_to_cpu ( u.res->qword.len ) ); + if ( ( bus >= start ) && ( bus < end ) ) + return 0; + + /* We have seen at least one non-matching range + * descriptor, so assume failure unless we find a + * subsequent match. + */ + rc = -ENOENT; + } + + return rc; +} + +/** * Open EFI PCI root bridge I/O protocol * * @v pci PCI device @@ -106,7 +170,7 @@ static int efipci_root_open ( struct pci_device *pci, EFI_HANDLE *handle, strerror ( rc ) ); continue; } - if ( u.root->SegmentNumber == PCI_SEG ( pci->busdevfn ) ) { + if ( efipci_root_match ( pci, *handle, u.root ) == 0 ) { *root = u.root; bs->FreePool ( handles ); return 0; @@ -263,13 +327,13 @@ void * efipci_ioremap ( struct pci_device *pci, unsigned long bus_addr, for ( ; ( ( tag = acpi_resource_tag ( u.res ) ) != ACPI_END_RESOURCE ) ; u.res = acpi_resource_next ( u.res ) ) { - /* Ignore anything other than an address space descriptor */ + /* Ignore anything other than a memory range descriptor */ if ( tag != ACPI_QWORD_ADDRESS_SPACE_RESOURCE ) continue; - - /* Ignore descriptors that do not cover this memory range */ if ( u.res->qword.type != ACPI_ADDRESS_TYPE_MEM ) continue; + + /* Ignore descriptors that do not cover this memory range */ offset = le64_to_cpu ( u.res->qword.offset ); start = ( offset + le64_to_cpu ( u.res->qword.min ) ); end = ( start + le64_to_cpu ( u.res->qword.len ) ); |