// SPDX-License-Identifier: GPL-2.0+
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/*
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* PCI Express Hot Plug Controller Driver
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*
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* Copyright (C) 1995,2001 Compaq Computer Corporation
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* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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* Copyright (C) 2003-2004 Intel Corporation
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*
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* All rights reserved.
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*
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* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
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*
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*/
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#define dev_fmt(fmt) "pciehp: " fmt
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include "../pci.h"
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#include "pciehp.h"
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/**
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* pciehp_configure_device() - enumerate PCI devices below a hotplug bridge
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* @ctrl: PCIe hotplug controller
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*
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* Enumerate PCI devices below a hotplug bridge and add them to the system.
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* Return 0 on success, %-EEXIST if the devices are already enumerated or
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* %-ENODEV if enumeration failed.
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*/
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int pciehp_configure_device(struct controller *ctrl)
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{
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struct pci_dev *dev;
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struct pci_dev *bridge = ctrl->pcie->port;
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struct pci_bus *parent = bridge->subordinate;
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int num, ret = 0;
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pci_lock_rescan_remove();
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dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
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if (dev) {
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/*
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* The device is already there. Either configured by the
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* boot firmware or a previous hotplug event.
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*/
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ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping hot-add\n",
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pci_name(dev), pci_domain_nr(parent), parent->number);
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pci_dev_put(dev);
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ret = -EEXIST;
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goto out;
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}
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num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
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if (num == 0) {
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ctrl_err(ctrl, "No new device found\n");
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ret = -ENODEV;
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goto out;
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}
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for_each_pci_bridge(dev, parent)
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pci_hp_add_bridge(dev);
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pci_assign_unassigned_bridge_resources(bridge);
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pcie_bus_configure_settings(parent);
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pci_bus_add_devices(parent);
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out:
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pci_unlock_rescan_remove();
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return ret;
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}
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/**
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* pciehp_unconfigure_device() - remove PCI devices below a hotplug bridge
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* @ctrl: PCIe hotplug controller
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* @presence: whether the card is still present in the slot;
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* true for safe removal via sysfs or an Attention Button press,
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* false for surprise removal
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*
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* Unbind PCI devices below a hotplug bridge from their drivers and remove
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* them from the system. Safely removed devices are quiesced. Surprise
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* removed devices are marked as such to prevent further accesses.
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*/
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void pciehp_unconfigure_device(struct controller *ctrl, bool presence)
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{
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struct pci_dev *dev, *temp;
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struct pci_bus *parent = ctrl->pcie->port->subordinate;
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u16 command;
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ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
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__func__, pci_domain_nr(parent), parent->number);
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if (!presence)
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pci_walk_bus(parent, pci_dev_set_disconnected, NULL);
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pci_lock_rescan_remove();
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/*
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* Stopping an SR-IOV PF device removes all the associated VFs,
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* which will update the bus->devices list and confuse the
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* iterator. Therefore, iterate in reverse so we remove the VFs
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* first, then the PF. We do the same in pci_stop_bus_device().
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*/
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list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
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bus_list) {
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pci_dev_get(dev);
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pci_stop_and_remove_bus_device(dev);
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/*
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* Ensure that no new Requests will be generated from
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* the device.
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*/
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if (presence) {
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pci_read_config_word(dev, PCI_COMMAND, &command);
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command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
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command |= PCI_COMMAND_INTX_DISABLE;
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pci_write_config_word(dev, PCI_COMMAND, command);
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}
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pci_dev_put(dev);
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}
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pci_unlock_rescan_remove();
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}
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