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Commit afd29f90 authored by Mika Westerberg's avatar Mika Westerberg Committed by Rafael J. Wysocki
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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: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 10b68700

drivers/pci/pci.c

+24 −0
Original line number Diff line number Diff line
@@ -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

include/linux/pci.h

+4 −0
Original line number Diff line number Diff line
@@ -1126,6 +1126,7 @@ void pdev_enable_device(struct pci_dev *); 
int pci_enable_resources(struct pci_dev *, int mask);

void pci_fixup_irqs(u8 (*)(struct pci_dev *, u8 *),

		    int (*)(const struct pci_dev *, u8, u8));

struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res);

#define HAVE_PCI_REQ_REGIONS	2

int __must_check pci_request_regions(struct pci_dev *, const char *);

int __must_check pci_request_regions_exclusive(struct pci_dev *, const char *);
@@ -1542,6 +1543,9 @@ static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state, 
				  int enable)

{ return 0; }



static inline struct resource *pci_find_resource(struct pci_dev *dev,

						 struct resource *res)

{ return NULL; }

static inline int pci_request_regions(struct pci_dev *dev, const char *res_name)

{ return -EIO; }

static inline void pci_release_regions(struct pci_dev *dev) { }