pcie的quirk函数的执行优先级

在drivers/pci/quirks.c 中可以注册函数修复pcie的bug。例如static void quirk_mellanox_tavor(struct pci_dev *dev){dev->broken_parity_status = 1;/* This device gives false positives */}DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MELLANOX, PCI_DEVICE_ID_MELLANOX_TAVOR_BRIDGE, quirk_mellanox_tavor);当在scan root port的时候发现vendor id是PCI_VENDOR_ID_MELLANOX的话，就会调用quirk_mellanox_tavor。从这里可以通过DECLARE_PCI_FIXUP_FINAL 来注册回调函数来修复硬件bug与之类似的函数还有很多，这些函数都定义在drivers/pci/pci.h 中#define DECLARE_PCI_FIXUP_CLASS_EARLY(vendor, device, class,\ class_shift, hook)\DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early,\hook, vendor, device, class, class_shift, hook)#define DECLARE_PCI_FIXUP_CLASS_HEADER(vendor, device, class,\ class_shift, hook)\DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header,\hook, vendor, device, class, class_shift, hook)#define DECLARE_PCI_FIXUP_CLASS_FINAL(vendor, device, class,\ class_shift, hook)\DECLARE_PCI_FIXUP_SECTION(.pci_fixup_final,\hook, vendor, device, class, class_shift, hook)这些回调函数会在pcie 初始化的不同阶段执行，可以从下面看到，总共可以在pcie运行过程中总共有8个点可以执行quirk的回调函数enum pci_fixup_pass {pci_fixup_early,/* Before probing BARs */pci_fixup_header,/* After reading configuration header */pci_fixup_final,/* Final phase of device fixups */pci_fixup_enable,/* pci_enable_device() time */pci_fixup_resume,/* pci_device_resume() */pci_fixup_suspend,/* pci_device_suspend() */pci_fixup_resume_early, /* pci_device_resume_early() */pci_fixup_suspend_late,/* pci_device_suspend_late() */};