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Commit 9a3d2b9b authored by Alex Williamson's avatar Alex Williamson Committed by Bjorn Helgaas
Browse files

PCI: Add pci_probe_reset_slot() and pci_probe_reset_bus() 



Users of pci_reset_bus() and pci_reset_slot() need a way to probe
whether the bus or slot supports reset.  Add trivial helper functions
and export them as vfio-pci will make use of these.

Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 1b95ce8f

drivers/pci/pci.c

+24 −0
Original line number Diff line number Diff line
@@ -3609,6 +3609,18 @@ static int pci_slot_reset(struct pci_slot *slot, int probe) 
	return rc;

}



/**

 * pci_probe_reset_slot - probe whether a PCI slot can be reset

 * @slot: PCI slot to probe

 *

 * Return 0 if slot can be reset, negative if a slot reset is not supported.

 */

int pci_probe_reset_slot(struct pci_slot *slot)

{

	return pci_slot_reset(slot, 1);

}

EXPORT_SYMBOL_GPL(pci_probe_reset_slot);



/**

 * pci_reset_slot - reset a PCI slot

 * @slot: PCI slot to reset
@@ -3661,6 +3673,18 @@ static int pci_bus_reset(struct pci_bus *bus, int probe) 
	return 0;

}



/**

 * pci_probe_reset_bus - probe whether a PCI bus can be reset

 * @bus: PCI bus to probe

 *

 * Return 0 if bus can be reset, negative if a bus reset is not supported.

 */

int pci_probe_reset_bus(struct pci_bus *bus)

{

	return pci_bus_reset(bus, 1);

}

EXPORT_SYMBOL_GPL(pci_probe_reset_bus);



/**

 * pci_reset_bus - reset a PCI bus

 * @bus: top level PCI bus to reset

include/linux/pci.h

+2 −0
Original line number Diff line number Diff line
@@ -924,7 +924,9 @@ int pcie_set_mps(struct pci_dev *dev, int mps); 
int __pci_reset_function(struct pci_dev *dev);

int __pci_reset_function_locked(struct pci_dev *dev);

int pci_reset_function(struct pci_dev *dev);

int pci_probe_reset_slot(struct pci_slot *slot);

int pci_reset_slot(struct pci_slot *slot);

int pci_probe_reset_bus(struct pci_bus *bus);

int pci_reset_bus(struct pci_bus *bus);

void pci_reset_bridge_secondary_bus(struct pci_dev *dev);

void pci_update_resource(struct pci_dev *dev, int resno);