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authorSheng Yang <sheng@linux.intel.com>2008-10-21 05:38:25 -0400
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-10-22 19:42:35 -0400
commit8dd7f8036c123296fc4214f9d8810eb485570422 (patch)
tree0c6cab9083be724d2c72ba4aabef9e3b0dffd7fc /drivers/ieee1394/raw1394.c
parentc4ed02fae78bf6cea0b22edd34a67df972f29832 (diff)
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 'drivers/ieee1394/raw1394.c')
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