pci_find_ext_capability
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## Name

pci_find_ext_capability — Find an extended capability

## Synopsis

`int pci_find_ext_capability (` | struct pci_dev * dev,
| int cap`)`;

## Arguments

`dev`

  PCI device to query

`cap`

  capability code

## Description

Returns the address of the requested extended capability structure within the device's PCI configuration space or 0 if the device does not support it. Possible values for `cap`:

`PCI_EXT_CAP_ID_ERR` Advanced Error Reporting `PCI_EXT_CAP_ID_VC` Virtual Channel `PCI_EXT_CAP_ID_DSN` Device Serial Number `PCI_EXT_CAP_ID_PWR` Power Budgeting

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