diff options
| author | Sheng Yang <sheng@linux.intel.com> | 2008-10-21 17:38:25 +0800 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2008-10-22 16:42:35 -0700 |
| commit | 8dd7f8036c123296fc4214f9d8810eb485570422 (patch) | |
| tree | 0c6cab9083be724d2c72ba4aabef9e3b0dffd7fc /include/linux/pci.h | |
| parent | c4ed02fae78bf6cea0b22edd34a67df972f29832 (diff) | |
| download | lwn-8dd7f8036c123296fc4214f9d8810eb485570422.tar.gz lwn-8dd7f8036c123296fc4214f9d8810eb485570422.zip | |
PCI: add support for function level reset
Sometimes, it's necessary to enable software's ability to quiesce and
reset endpoint hardware with function-level granularity, so provide
support for it.
The patch implement Function Level Reset(FLR) feature following PCI-e
spec. And this is the first step. We would add more generic method, like
D0/D3, to allow more devices support this function.
The patch contains two functions. pcie_reset_function() is the new
driver API, and, contains some action to quiesce a device. The other
function is a helper: pcie_execute_reset_function() just executes the
reset for a particular device function.
Current the usage model is in KVM. Function reset is necessary for
assigning device to a guest, or moving it between partitions.
For Function Level Reset(FLR), please refer to PCI Express spec chapter
6.6.2.
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'include/linux/pci.h')
| -rw-r--r-- | include/linux/pci.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 085187be29c7..f6f6810296e6 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -626,6 +626,8 @@ int pcix_get_mmrbc(struct pci_dev *dev); int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc); int pcie_get_readrq(struct pci_dev *dev); int pcie_set_readrq(struct pci_dev *dev, int rq); +int pci_reset_function(struct pci_dev *dev); +int pci_execute_reset_function(struct pci_dev *dev); void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno); int __must_check pci_assign_resource(struct pci_dev *dev, int i); int pci_select_bars(struct pci_dev *dev, unsigned long flags); |