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[pci] Add pci_find_next_capability()

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PCI devices may support more capabilities of the same type (for
example PCI_CAP_ID_VNDR) and there was no way to discover all of them.
This commit adds a new API pci_find_next_capability which provides
this functionality.  It would typically be used like so:

  for (pos = pci_find_capability(pci, PCI_CAP_ID_VNDR);
       pos > 0;
       pos = pci_find_next_capability(pci, pos, PCI_CAP_ID_VNDR)) {
    ...
  }

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Ladi Prosek
2016-04-11 11:26:56 +02:00
committed by Michael Brown
parent 5e5450c2d0
commit 2379494918
2 changed files with 43 additions and 13 deletions
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2
src/include/ipxe/pci.h
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@@ -286,6 +286,8 @@ extern int pci_find_driver ( struct pci_device *pci );
extern int pci_probe ( struct pci_device *pci );
extern void pci_remove ( struct pci_device *pci );
extern int pci_find_capability ( struct pci_device *pci, int capability );
extern int pci_find_next_capability ( struct pci_device *pci,
int pos, int capability );
extern unsigned long pci_bar_size ( struct pci_device *pci, unsigned int reg );
/**