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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * PCI Express Hot Plug Controller Driver
- *
- * Copyright (C) 1995,2001 Compaq Computer Corporation
- * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
- * Copyright (C) 2001 IBM Corp.
- * Copyright (C) 2003-2004 Intel Corporation
- *
- * All rights reserved.
- *
- * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
- *
- */
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/pci.h>
- #include "../pci.h"
- #include "pciehp.h"
- int pciehp_configure_device(struct slot *p_slot)
- {
- struct pci_dev *dev;
- struct pci_dev *bridge = p_slot->ctrl->pcie->port;
- struct pci_bus *parent = bridge->subordinate;
- int num, ret = 0;
- struct controller *ctrl = p_slot->ctrl;
- pci_lock_rescan_remove();
- dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
- if (dev) {
- /*
- * The device is already there. Either configured by the
- * boot firmware or a previous hotplug event.
- */
- ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping hot-add\n",
- pci_name(dev), pci_domain_nr(parent), parent->number);
- pci_dev_put(dev);
- ret = -EEXIST;
- goto out;
- }
- num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
- if (num == 0) {
- ctrl_err(ctrl, "No new device found\n");
- ret = -ENODEV;
- goto out;
- }
- for_each_pci_bridge(dev, parent)
- pci_hp_add_bridge(dev);
- pci_assign_unassigned_bridge_resources(bridge);
- pcie_bus_configure_settings(parent);
- pci_bus_add_devices(parent);
- out:
- pci_unlock_rescan_remove();
- return ret;
- }
- void pciehp_unconfigure_device(struct slot *p_slot)
- {
- u8 presence = 0;
- struct pci_dev *dev, *temp;
- struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
- u16 command;
- struct controller *ctrl = p_slot->ctrl;
- ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
- __func__, pci_domain_nr(parent), parent->number);
- pciehp_get_adapter_status(p_slot, &presence);
- pci_lock_rescan_remove();
- /*
- * Stopping an SR-IOV PF device removes all the associated VFs,
- * which will update the bus->devices list and confuse the
- * iterator. Therefore, iterate in reverse so we remove the VFs
- * first, then the PF. We do the same in pci_stop_bus_device().
- */
- list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
- bus_list) {
- pci_dev_get(dev);
- if (!presence) {
- pci_dev_set_disconnected(dev, NULL);
- if (pci_has_subordinate(dev))
- pci_walk_bus(dev->subordinate,
- pci_dev_set_disconnected, NULL);
- }
- pci_stop_and_remove_bus_device(dev);
- /*
- * Ensure that no new Requests will be generated from
- * the device.
- */
- if (presence) {
- pci_read_config_word(dev, PCI_COMMAND, &command);
- command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
- command |= PCI_COMMAND_INTX_DISABLE;
- pci_write_config_word(dev, PCI_COMMAND, command);
- }
- pci_dev_put(dev);
- }
- pci_unlock_rescan_remove();
- }
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