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[efi] Cache identified PCI root bridge I/O protocol handle

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Reduce the overhead of PCI configuration space accesses (and the
verbosity of debug messages) by caching the identified PCI root bridge
I/O protocol handle for the most recently accessed PCI device.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2026-02-04 13:42:21 +00:00
parent 30d162ddd1
commit c18d895704
1 changed files with 10 additions and 4 deletions
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14
src/interface/efi/efi_pci.c
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@ -255,12 +255,18 @@ static void efipci_discover ( uint32_t busdevfn, struct pci_range *range ) {
*/
static int efipci_root_open ( struct pci_device *pci, EFI_HANDLE *handle,
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL **root ) {
struct pci_range tmp;
static struct {
struct pci_range range;
EFI_HANDLE handle;
} cache;
int rc;
/* Find matching root bridge I/O protocol handle */
if ( ( rc = efipci_discover_any ( pci, &tmp, handle ) ) != 0 )
return rc;
/* Find and cache matching root bridge I/O protocol handle, if any */
if ( ( pci->busdevfn - cache.range.start ) >= cache.range.count )
efipci_discover_any ( pci, &cache.range, &cache.handle );
if ( ! cache.handle )
return -ENOENT;
*handle = cache.handle;
/* Open PCI root bridge I/O protocol */
if ( ( rc = efi_open ( *handle, &efi_pci_root_bridge_io_protocol_guid,