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| author | Michael Brown <mcb30@ipxe.org> | 2021-04-10 13:14:30 +0100 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2021-04-10 15:05:05 +0100 |
| commit | 0be8491b717fec6697dbf6ef8ac07604e062ecb1 (patch) | |
| tree | 1f5d84a13dbd6113e7e884a2795e6e01cdda3a31 /src/arch | |
| parent | c0346dbb49de0bb6c7637c511a175ce478aca9b9 (diff) | |
| download | ipxe-0be8491b717fec6697dbf6ef8ac07604e062ecb1.zip ipxe-0be8491b717fec6697dbf6ef8ac07604e062ecb1.tar.gz ipxe-0be8491b717fec6697dbf6ef8ac07604e062ecb1.tar.bz2 | |
[pci] Avoid scanning nonexistent buses when using PCIAPI_DIRECT
There is no method for obtaining the number of PCI buses when using
PCIAPI_DIRECT, and we therefore currently scan all possible bus
numbers. This can cause a several-second startup delay in some
virtualised environments, since PCI configuration space access will
necessarily require the involvement of the hypervisor.
Ameliorate this situation by defaulting to scanning only a single bus,
and expanding the number of PCI buses to accommodate any subordinate
buses that are detected during enumeration.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/include/ipxe/pcidirect.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/arch/x86/include/ipxe/pcidirect.h b/src/arch/x86/include/ipxe/pcidirect.h index 9570fd7..decdc81 100644 --- a/src/arch/x86/include/ipxe/pcidirect.h +++ b/src/arch/x86/include/ipxe/pcidirect.h @@ -32,8 +32,8 @@ extern void pcidirect_prepare ( struct pci_device *pci, int where ); */ static inline __always_inline int PCIAPI_INLINE ( direct, pci_num_bus ) ( void ) { - /* No way to work this out via Type 1 accesses */ - return 0x100; + /* Scan first bus and rely on bridge detection to find higher buses */ + return 1; } /** |