forked from Minki/linux
22106368c9
The PCI Express port driver uses 'struct pcie_port_service_id' for matching port service devices and drivers, but this structure contains fields that duplicate information from the port device itself (vendor, device, subvendor, subdevice) and fields that are not used by any existing port service driver (class, class_mask, drvier_data). Also, both existing port service drivers (AER and PCIe HP) don't even use the vendor and device fields for device matching. Therefore 'struct pcie_port_service_id' can be removed altogether and the only useful members of it (port_type, service) can be introduced directly into the port service device and port service driver structures. That simplifies the code quite a bit and reduces its size. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
132 lines
4.1 KiB
C
132 lines
4.1 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 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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{
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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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.port_type = PCIE_ANY_PORT,
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.service = PCIE_PORT_SERVICE_HP,
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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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