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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: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Alex Williamson 2013-08-14 14:06:05 -06:00 committed by Bjorn Helgaas
parent 1b95ce8fc9
commit 9a3d2b9bee
2 changed files with 26 additions and 0 deletions
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24
drivers/pci/pci.c
View File

@ -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

2
include/linux/pci.h
View File

@ -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);