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| author |   Michael S. Tsirkin <mst@redhat.com> | 2009-07-27 23:37:48 +0300 |
|---|---|---|
| committer |   Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-09-09 13:29:24 -0700 |
| commit | 711d57796f5ce2d02d6e62c9034afbb16aedda31 (patch) | |
| tree | 935861fee775b171cafc96de57fe4fbfa19892eb /drivers/pci/pci.c | |
| parent | PCI Hotplug: acpiphp: get pci_bus from acpi handle correctly (diff) | |
| download | linux-dev-711d57796f5ce2d02d6e62c9034afbb16aedda31.tar.xz linux-dev-711d57796f5ce2d02d6e62c9034afbb16aedda31.zip | |
PCI: expose function reset capability in sysfs
Some devices allow an individual function to be reset without affecting
other functions in the same device: that's what pci_reset_function does.
For devices that have this support, expose reset attribite in sysfs.
This is useful e.g. for virtualization, where a qemu userspace
process wants to reset the device when the guest is reset,
to emulate machine reboot as closely as possible.
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 7b70312181d7..7d55039ffa05 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2262,6 +2262,22 @@ int __pci_reset_function(struct pci_dev *dev) EXPORT_SYMBOL_GPL(__pci_reset_function); /** + * pci_probe_reset_function - check whether the device can be safely reset + * @dev: PCI device to reset + * + * Some devices allow an individual function to be reset without affecting + * other functions in the same device. The PCI device must be responsive + * to PCI config space in order to use this function. + * + * Returns 0 if the device function can be reset or negative if the + * device doesn't support resetting a single function. + */ +int pci_probe_reset_function(struct pci_dev *dev) +{ + return pci_dev_reset(dev, 1); +} + +/** * pci_reset_function - quiesce and reset a PCI device function * @dev: PCI device to reset * |