When a PCI device is passed through to a different domain, it must be reset to ensure it works correctly in the new domain. Usually the toolstack will request a device reset via the "reset" sysfs file. But this file is not present if a function reset is not available. A common use case is a GPU device and its associated audio function. In the case where these two devices are simultaneously co-assigned to the same domain, it is safe to reset them with an SBR. Patch #1 export pci_probe_reset_function() so pciback can know if an alternate reset mechanism needs to be proved. Patch #2 adds a "reset" file to devices bound to pciback that performs the SBR if it is safe to do so. David -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
