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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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971427f582
As commit ac205b7bb7 ("PCI: make sriov work with hotplug remove")
indicates, VFs which is on the same PCI bus as their PF, should be
removed before the PF. Otherwise, we might run into kernel crash
at PCI unplugging time.
This applies the above pattern to powerpc PCI hotplug path.
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Acked-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
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* Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c"
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*
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* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
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* Copyright (C) 2005 International Business Machines
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*
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* Updates, 2005, John Rose <johnrose@austin.ibm.com>
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* Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
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* Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/pci.h>
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#include <linux/export.h>
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#include <asm/pci-bridge.h>
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#include <asm/ppc-pci.h>
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#include <asm/firmware.h>
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#include <asm/eeh.h>
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/**
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* pcibios_release_device - release PCI device
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* @dev: PCI device
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*
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* The function is called before releasing the indicated PCI device.
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*/
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void pcibios_release_device(struct pci_dev *dev)
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{
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struct pci_controller *phb = pci_bus_to_host(dev->bus);
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eeh_remove_device(dev);
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if (phb->controller_ops.release_device)
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phb->controller_ops.release_device(dev);
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}
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/**
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* pcibios_remove_pci_devices - remove all devices under this bus
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* @bus: the indicated PCI bus
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*
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* Remove all of the PCI devices under this bus both from the
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* linux pci device tree, and from the powerpc EEH address cache.
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*/
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void pcibios_remove_pci_devices(struct pci_bus *bus)
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{
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struct pci_dev *dev, *tmp;
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struct pci_bus *child_bus;
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/* First go down child busses */
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list_for_each_entry(child_bus, &bus->children, node)
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pcibios_remove_pci_devices(child_bus);
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pr_debug("PCI: Removing devices on bus %04x:%02x\n",
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pci_domain_nr(bus), bus->number);
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list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
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pr_debug(" Removing %s...\n", pci_name(dev));
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pci_stop_and_remove_bus_device(dev);
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}
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}
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EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
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/**
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* pcibios_add_pci_devices - adds new pci devices to bus
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* @bus: the indicated PCI bus
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*
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* This routine will find and fixup new pci devices under
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* the indicated bus. This routine presumes that there
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* might already be some devices under this bridge, so
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* it carefully tries to add only new devices. (And that
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* is how this routine differs from other, similar pcibios
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* routines.)
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*/
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void pcibios_add_pci_devices(struct pci_bus * bus)
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{
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int slotno, mode, pass, max;
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struct pci_dev *dev;
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struct pci_controller *phb;
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struct device_node *dn = pci_bus_to_OF_node(bus);
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eeh_add_device_tree_early(PCI_DN(dn));
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phb = pci_bus_to_host(bus);
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mode = PCI_PROBE_NORMAL;
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if (phb->controller_ops.probe_mode)
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mode = phb->controller_ops.probe_mode(bus);
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if (mode == PCI_PROBE_DEVTREE) {
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/* use ofdt-based probe */
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of_rescan_bus(dn, bus);
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} else if (mode == PCI_PROBE_NORMAL) {
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/*
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* Use legacy probe. In the partial hotplug case, we
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* probably have grandchildren devices unplugged. So
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* we don't check the return value from pci_scan_slot() in
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* order for fully rescan all the way down to pick them up.
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* They can have been removed during partial hotplug.
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*/
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slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
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pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
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pcibios_setup_bus_devices(bus);
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max = bus->busn_res.start;
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for (pass = 0; pass < 2; pass++) {
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list_for_each_entry(dev, &bus->devices, bus_list) {
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if (pci_is_bridge(dev))
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max = pci_scan_bridge(bus, dev,
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max, pass);
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}
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}
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}
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pcibios_finish_adding_to_bus(bus);
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}
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EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
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