![Kenji Kaneshige](/assets/img/avatar_default.png)
Some ACPI related PCI hotplug code can be shared among PCI hotplug drivers. This patch introduces the following functions in drivers/pci/hotplug/acpi_pcihp.c to share the code, and changes acpiphp and pciehp to use them. - int acpi_pci_detect_ejectable(struct pci_bus *pbus) This checks if the specified PCI bus has ejectable slots. - int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle) This checks if the specified handle is ejectable ACPI PCI slot. The 'pbus' parameter is needed to check if 'handle' is PCI related ACPI object. This patch also introduces the following inline function in include/linux/pci-acpi.h, which is useful to get ACPI handle of the PCI bridge from struct pci_bus of the bridge's secondary bus. - static inline acpi_handle acpi_pci_get_bridge_handle(struct pci_bus *pbus) This returns ACPI handle of the PCI bridge which generates PCI bus specified by 'pbus'. Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
142 lines
4.4 KiB
C
142 lines
4.4 KiB
C
/*
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* ACPI related functions for PCI Express Hot Plug driver.
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*
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* Copyright (C) 2008 Kenji Kaneshige
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* Copyright (C) 2008 Fujitsu Limited.
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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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*/
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#include <linux/acpi.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include "pciehp.h"
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#define PCIEHP_DETECT_PCIE (0)
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#define PCIEHP_DETECT_ACPI (1)
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#define PCIEHP_DETECT_AUTO (2)
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#define PCIEHP_DETECT_DEFAULT PCIEHP_DETECT_AUTO
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static int slot_detection_mode;
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static char *pciehp_detect_mode;
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module_param(pciehp_detect_mode, charp, 0444);
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MODULE_PARM_DESC(pciehp_detect_mode,
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"Slot detection mode: pcie, acpi, auto\n"
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" pcie - Use PCIe based slot detection\n"
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" acpi - Use ACPI for slot detection\n"
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" auto(default) - Auto select mode. Use acpi option if duplicate\n"
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" slot ids are found. Otherwise, use pcie option\n");
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int pciehp_acpi_slot_detection_check(struct pci_dev *dev)
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{
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if (slot_detection_mode != PCIEHP_DETECT_ACPI)
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return 0;
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if (acpi_pci_detect_ejectable(dev->subordinate))
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return 0;
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return -ENODEV;
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}
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static int __init parse_detect_mode(void)
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{
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if (!pciehp_detect_mode)
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return PCIEHP_DETECT_DEFAULT;
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if (!strcmp(pciehp_detect_mode, "pcie"))
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return PCIEHP_DETECT_PCIE;
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if (!strcmp(pciehp_detect_mode, "acpi"))
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return PCIEHP_DETECT_ACPI;
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if (!strcmp(pciehp_detect_mode, "auto"))
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return PCIEHP_DETECT_AUTO;
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warn("bad specifier '%s' for pciehp_detect_mode. Use default\n",
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pciehp_detect_mode);
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return PCIEHP_DETECT_DEFAULT;
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}
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static struct pcie_port_service_id __initdata port_pci_ids[] = {
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{
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.vendor = PCI_ANY_ID,
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.device = PCI_ANY_ID,
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.port_type = PCIE_ANY_PORT,
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.service_type = PCIE_PORT_SERVICE_HP,
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.driver_data = 0,
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}, { /* end: all zeroes */ }
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};
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static int __initdata dup_slot_id;
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static int __initdata acpi_slot_detected;
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static struct list_head __initdata dummy_slots = LIST_HEAD_INIT(dummy_slots);
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/* Dummy driver for dumplicate name detection */
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static int __init dummy_probe(struct pcie_device *dev,
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const struct pcie_port_service_id *id)
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{
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int pos;
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u32 slot_cap;
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struct slot *slot, *tmp;
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struct pci_dev *pdev = dev->port;
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struct pci_bus *pbus = pdev->subordinate;
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if (!(slot = kzalloc(sizeof(*slot), GFP_KERNEL)))
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return -ENOMEM;
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/* Note: pciehp_detect_mode != PCIEHP_DETECT_ACPI here */
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if (pciehp_get_hp_hw_control_from_firmware(pdev))
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return -ENODEV;
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if (!(pos = pci_find_capability(pdev, PCI_CAP_ID_EXP)))
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return -ENODEV;
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pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, &slot_cap);
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slot->number = slot_cap >> 19;
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list_for_each_entry(tmp, &dummy_slots, slot_list) {
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if (tmp->number == slot->number)
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dup_slot_id++;
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}
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list_add_tail(&slot->slot_list, &dummy_slots);
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if (!acpi_slot_detected && acpi_pci_detect_ejectable(pbus))
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acpi_slot_detected = 1;
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return -ENODEV; /* dummy driver always returns error */
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}
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static struct pcie_port_service_driver __initdata dummy_driver = {
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.name = "pciehp_dummy",
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.id_table = port_pci_ids,
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.probe = dummy_probe,
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};
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static int __init select_detection_mode(void)
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{
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struct slot *slot, *tmp;
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pcie_port_service_register(&dummy_driver);
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pcie_port_service_unregister(&dummy_driver);
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list_for_each_entry_safe(slot, tmp, &dummy_slots, slot_list) {
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list_del(&slot->slot_list);
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kfree(slot);
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}
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if (acpi_slot_detected && dup_slot_id)
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return PCIEHP_DETECT_ACPI;
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return PCIEHP_DETECT_PCIE;
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}
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void __init pciehp_acpi_slot_detection_init(void)
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{
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slot_detection_mode = parse_detect_mode();
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if (slot_detection_mode != PCIEHP_DETECT_AUTO)
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goto out;
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slot_detection_mode = select_detection_mode();
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out:
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if (slot_detection_mode == PCIEHP_DETECT_ACPI)
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info("Using ACPI for slot detection.\n");
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}
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