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| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2016-09-15 11:07:03 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-09-17 01:16:03 +0200 |
| commit | afd29f9017a271fb048b69275975c5451fd0e674 (patch) | |
| tree | f2de464548ec5b7e9749b780e114c6eeb669e679 /drivers/pci | |
| parent | 10b68700add43d0c38fedefb7a2b7df931f8e84e (diff) | |
| download | linux-afd29f9017a271fb048b69275975c5451fd0e674.tar.bz2 | |
PCI: Add pci_find_resource()
Add a new helper function pci_find_resource() that can be used to find out
whether a given resource (for example from a child device) is contained
within given PCI device's standard resources.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index aab9d5115a5f..415956c5c593 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -480,6 +480,30 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev, EXPORT_SYMBOL(pci_find_parent_resource); /** + * pci_find_resource - Return matching PCI device resource + * @dev: PCI device to query + * @res: Resource to look for + * + * Goes over standard PCI resources (BARs) and checks if the given resource + * is partially or fully contained in any of them. In that case the + * matching resource is returned, %NULL otherwise. + */ +struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res) +{ + int i; + + for (i = 0; i < PCI_ROM_RESOURCE; i++) { + struct resource *r = &dev->resource[i]; + + if (r->start && resource_contains(r, res)) + return r; + } + + return NULL; +} +EXPORT_SYMBOL(pci_find_resource); + +/** * pci_find_pcie_root_port - return PCIe Root Port * @dev: PCI device to query * |