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PCI: Add pci_find_resource()

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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>
This commit is contained in:
Mika Westerberg
2016-09-15 11:07:03 +03:00
committed by Rafael J. Wysocki
parent 10b68700ad
commit afd29f9017
2 changed files with 28 additions and 0 deletions
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24
drivers/pci/pci.c
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@@ -479,6 +479,30 @@ 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