mirror of https://gitee.com/openkylin/linux.git
131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/*
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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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* 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 (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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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#include <linux/module.h>
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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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int pciehp_configure_device(struct slot *p_slot)
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{
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struct pci_dev *dev;
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struct pci_dev *bridge = p_slot->ctrl->pcie->port;
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struct pci_bus *parent = bridge->subordinate;
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int num;
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struct controller *ctrl = p_slot->ctrl;
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dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
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if (dev) {
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ctrl_err(ctrl, "Device %s already exists "
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"at %04x:%02x:00, cannot hot-add\n", pci_name(dev),
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pci_domain_nr(parent), parent->number);
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pci_dev_put(dev);
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return -EINVAL;
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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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return -ENODEV;
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}
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list_for_each_entry(dev, &parent->devices, bus_list)
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if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
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(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
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pci_hp_add_bridge(dev);
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pci_assign_unassigned_bridge_resources(bridge);
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list_for_each_entry(dev, &parent->devices, bus_list) {
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if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
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continue;
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pci_configure_slot(dev);
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}
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pci_bus_add_devices(parent);
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return 0;
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}
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int pciehp_unconfigure_device(struct slot *p_slot)
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{
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int ret, rc = 0;
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u8 bctl = 0;
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u8 presence = 0;
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struct pci_dev *dev, *temp;
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struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
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u16 command;
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struct controller *ctrl = p_slot->ctrl;
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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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ret = pciehp_get_adapter_status(p_slot, &presence);
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if (ret)
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presence = 0;
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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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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
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pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
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if (bctl & PCI_BRIDGE_CTL_VGA) {
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ctrl_err(ctrl,
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"Cannot remove display device %s\n",
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pci_name(dev));
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pci_dev_put(dev);
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rc = -EINVAL;
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break;
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}
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}
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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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return rc;
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}
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