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* pci/yinghai-hotplug-cleanup: PCI: acpiphp: merge acpiphp_debug and debug PCI: acpiphp: remove unused res_lock
1600 lines
38 KiB
C
1600 lines
38 KiB
C
/*
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* ACPI PCI HotPlug glue functions to ACPI CA subsystem
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*
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* Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
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* Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
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* Copyright (C) 2002,2003 NEC Corporation
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* Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
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* Copyright (C) 2003-2005 Hewlett Packard
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* Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
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* Copyright (C) 2005 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 <kristen.c.accardi@intel.com>
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*
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*/
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/*
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* Lifetime rules for pci_dev:
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* - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
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* when the bridge is scanned and it loses a refcount when the bridge
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* is removed.
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* - When a P2P bridge is present, we elevate the refcount on the subordinate
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* bus. It loses the refcount when the the driver unloads.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/pci-acpi.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include "../pci.h"
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#include "acpiphp.h"
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static LIST_HEAD(bridge_list);
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#define MY_NAME "acpiphp_glue"
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static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
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static void acpiphp_sanitize_bus(struct pci_bus *bus);
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static void acpiphp_set_hpp_values(struct pci_bus *bus);
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static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
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/* callback routine to check for the existence of a pci dock device */
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static acpi_status
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is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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int *count = (int *)context;
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if (is_dock_device(handle)) {
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(*count)++;
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return AE_CTRL_TERMINATE;
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} else {
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return AE_OK;
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}
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}
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/*
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* the _DCK method can do funny things... and sometimes not
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* hah-hah funny.
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*
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* TBD - figure out a way to only call fixups for
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* systems that require them.
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*/
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static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
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void *v)
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{
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struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
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struct pci_bus *bus = func->slot->bridge->pci_bus;
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u32 buses;
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if (!bus->self)
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return NOTIFY_OK;
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/* fixup bad _DCK function that rewrites
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* secondary bridge on slot
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*/
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pci_read_config_dword(bus->self,
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PCI_PRIMARY_BUS,
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&buses);
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if (((buses >> 8) & 0xff) != bus->busn_res.start) {
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buses = (buses & 0xff000000)
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| ((unsigned int)(bus->primary) << 0)
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| ((unsigned int)(bus->busn_res.start) << 8)
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| ((unsigned int)(bus->busn_res.end) << 16);
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pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
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}
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return NOTIFY_OK;
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}
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static const struct acpi_dock_ops acpiphp_dock_ops = {
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.handler = handle_hotplug_event_func,
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};
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/* callback routine to register each ACPI PCI slot object */
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static acpi_status
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register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
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struct acpiphp_slot *slot;
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struct acpiphp_func *newfunc;
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acpi_handle tmp;
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acpi_status status = AE_OK;
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unsigned long long adr, sun;
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int device, function, retval;
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struct pci_bus *pbus = bridge->pci_bus;
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struct pci_dev *pdev;
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if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
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return AE_OK;
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status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
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if (ACPI_FAILURE(status)) {
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warn("can't evaluate _ADR (%#x)\n", status);
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return AE_OK;
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}
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device = (adr >> 16) & 0xffff;
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function = adr & 0xffff;
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pdev = pbus->self;
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if (pdev && pci_is_pcie(pdev)) {
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tmp = acpi_find_root_bridge_handle(pdev);
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if (tmp) {
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struct acpi_pci_root *root = acpi_pci_find_root(tmp);
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if (root && (root->osc_control_set &
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OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
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return AE_OK;
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}
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}
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newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
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if (!newfunc)
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return AE_NO_MEMORY;
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INIT_LIST_HEAD(&newfunc->sibling);
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newfunc->handle = handle;
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newfunc->function = function;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
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newfunc->flags = FUNC_HAS_EJ0;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
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newfunc->flags |= FUNC_HAS_STA;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
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newfunc->flags |= FUNC_HAS_PS0;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
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newfunc->flags |= FUNC_HAS_PS3;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
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newfunc->flags |= FUNC_HAS_DCK;
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status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
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if (ACPI_FAILURE(status)) {
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/*
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* use the count of the number of slots we've found
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* for the number of the slot
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*/
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sun = bridge->nr_slots+1;
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}
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/* search for objects that share the same slot */
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for (slot = bridge->slots; slot; slot = slot->next)
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if (slot->device == device) {
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if (slot->sun != sun)
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warn("sibling found, but _SUN doesn't match!\n");
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break;
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}
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if (!slot) {
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slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
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if (!slot) {
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kfree(newfunc);
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return AE_NO_MEMORY;
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}
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slot->bridge = bridge;
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slot->device = device;
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slot->sun = sun;
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INIT_LIST_HEAD(&slot->funcs);
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mutex_init(&slot->crit_sect);
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slot->next = bridge->slots;
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bridge->slots = slot;
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bridge->nr_slots++;
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dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
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slot->sun, pci_domain_nr(pbus), pbus->number, device);
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retval = acpiphp_register_hotplug_slot(slot);
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if (retval) {
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if (retval == -EBUSY)
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warn("Slot %llu already registered by another "
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"hotplug driver\n", slot->sun);
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else
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warn("acpiphp_register_hotplug_slot failed "
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"(err code = 0x%x)\n", retval);
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goto err_exit;
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}
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}
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newfunc->slot = slot;
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list_add_tail(&newfunc->sibling, &slot->funcs);
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pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
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if (pdev) {
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slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
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pci_dev_put(pdev);
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}
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if (is_dock_device(handle)) {
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/* we don't want to call this device's _EJ0
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* because we want the dock notify handler
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* to call it after it calls _DCK
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*/
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newfunc->flags &= ~FUNC_HAS_EJ0;
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if (register_hotplug_dock_device(handle,
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&acpiphp_dock_ops, newfunc))
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dbg("failed to register dock device\n");
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/* we need to be notified when dock events happen
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* outside of the hotplug operation, since we may
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* need to do fixups before we can hotplug.
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*/
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newfunc->nb.notifier_call = post_dock_fixups;
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if (register_dock_notifier(&newfunc->nb))
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dbg("failed to register a dock notifier");
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}
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/* install notify handler */
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if (!(newfunc->flags & FUNC_HAS_DCK)) {
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status = acpi_install_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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handle_hotplug_event_func,
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newfunc);
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if (ACPI_FAILURE(status))
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err("failed to register interrupt notify handler\n");
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} else
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status = AE_OK;
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return status;
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err_exit:
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bridge->nr_slots--;
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bridge->slots = slot->next;
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kfree(slot);
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kfree(newfunc);
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return AE_OK;
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}
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/* see if it's worth looking at this bridge */
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static int detect_ejectable_slots(acpi_handle handle)
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{
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int found = acpi_pci_detect_ejectable(handle);
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if (!found) {
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acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
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is_pci_dock_device, NULL, (void *)&found, NULL);
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}
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return found;
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}
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/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
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static void init_bridge_misc(struct acpiphp_bridge *bridge)
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{
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acpi_status status;
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/* must be added to the list prior to calling register_slot */
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list_add(&bridge->list, &bridge_list);
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/* register all slot objects under this bridge */
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
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register_slot, NULL, bridge, NULL);
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if (ACPI_FAILURE(status)) {
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list_del(&bridge->list);
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return;
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}
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/* install notify handler */
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if (bridge->type != BRIDGE_TYPE_HOST) {
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if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
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status = acpi_remove_notify_handler(bridge->func->handle,
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ACPI_SYSTEM_NOTIFY,
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handle_hotplug_event_func);
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if (ACPI_FAILURE(status))
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err("failed to remove notify handler\n");
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}
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status = acpi_install_notify_handler(bridge->handle,
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ACPI_SYSTEM_NOTIFY,
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handle_hotplug_event_bridge,
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bridge);
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if (ACPI_FAILURE(status)) {
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err("failed to register interrupt notify handler\n");
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}
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}
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}
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/* find acpiphp_func from acpiphp_bridge */
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static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
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{
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struct acpiphp_bridge *bridge;
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struct acpiphp_slot *slot;
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struct acpiphp_func *func;
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list_for_each_entry(bridge, &bridge_list, list) {
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for (slot = bridge->slots; slot; slot = slot->next) {
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list_for_each_entry(func, &slot->funcs, sibling) {
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if (func->handle == handle)
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return func;
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}
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}
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}
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return NULL;
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}
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static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
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{
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acpi_handle dummy_handle;
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if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
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"_STA", &dummy_handle)))
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bridge->flags |= BRIDGE_HAS_STA;
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if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
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"_EJ0", &dummy_handle)))
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bridge->flags |= BRIDGE_HAS_EJ0;
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if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
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"_PS0", &dummy_handle)))
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bridge->flags |= BRIDGE_HAS_PS0;
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if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
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"_PS3", &dummy_handle)))
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bridge->flags |= BRIDGE_HAS_PS3;
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/* is this ejectable p2p bridge? */
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if (bridge->flags & BRIDGE_HAS_EJ0) {
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struct acpiphp_func *func;
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dbg("found ejectable p2p bridge\n");
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/* make link between PCI bridge and PCI function */
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func = acpiphp_bridge_handle_to_function(bridge->handle);
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if (!func)
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return;
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bridge->func = func;
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func->bridge = bridge;
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}
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}
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/* allocate and initialize host bridge data structure */
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static void add_host_bridge(acpi_handle *handle)
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{
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struct acpiphp_bridge *bridge;
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struct acpi_pci_root *root = acpi_pci_find_root(handle);
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bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
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if (bridge == NULL)
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return;
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bridge->type = BRIDGE_TYPE_HOST;
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bridge->handle = handle;
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bridge->pci_bus = root->bus;
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init_bridge_misc(bridge);
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}
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/* allocate and initialize PCI-to-PCI bridge data structure */
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static void add_p2p_bridge(acpi_handle *handle)
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{
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struct acpiphp_bridge *bridge;
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bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
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if (bridge == NULL) {
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err("out of memory\n");
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return;
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}
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bridge->type = BRIDGE_TYPE_P2P;
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bridge->handle = handle;
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config_p2p_bridge_flags(bridge);
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bridge->pci_dev = acpi_get_pci_dev(handle);
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bridge->pci_bus = bridge->pci_dev->subordinate;
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if (!bridge->pci_bus) {
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err("This is not a PCI-to-PCI bridge!\n");
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goto err;
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}
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/*
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* Grab a ref to the subordinate PCI bus in case the bus is
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* removed via PCI core logical hotplug. The ref pins the bus
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* (which we access during module unload).
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*/
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get_device(&bridge->pci_bus->dev);
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init_bridge_misc(bridge);
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return;
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err:
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pci_dev_put(bridge->pci_dev);
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kfree(bridge);
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return;
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}
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/* callback routine to find P2P bridges */
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static acpi_status
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find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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acpi_status status;
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struct pci_dev *dev;
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dev = acpi_get_pci_dev(handle);
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if (!dev || !dev->subordinate)
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goto out;
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/* check if this bridge has ejectable slots */
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if ((detect_ejectable_slots(handle) > 0)) {
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dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
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add_p2p_bridge(handle);
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}
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/* search P2P bridges under this p2p bridge */
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
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find_p2p_bridge, NULL, NULL, NULL);
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if (ACPI_FAILURE(status))
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warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
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out:
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pci_dev_put(dev);
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return AE_OK;
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}
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/* find hot-pluggable slots, and then find P2P bridge */
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static int add_bridge(acpi_handle handle)
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{
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acpi_status status;
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unsigned long long tmp;
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acpi_handle dummy_handle;
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/* if the bridge doesn't have _STA, we assume it is always there */
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status = acpi_get_handle(handle, "_STA", &dummy_handle);
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if (ACPI_SUCCESS(status)) {
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status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
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if (ACPI_FAILURE(status)) {
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dbg("%s: _STA evaluation failure\n", __func__);
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return 0;
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}
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if ((tmp & ACPI_STA_FUNCTIONING) == 0)
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/* don't register this object */
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return 0;
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}
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/* check if this bridge has ejectable slots */
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if (detect_ejectable_slots(handle) > 0) {
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dbg("found PCI host-bus bridge with hot-pluggable slots\n");
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add_host_bridge(handle);
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}
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/* search P2P bridges under this host bridge */
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
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find_p2p_bridge, NULL, NULL, NULL);
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if (ACPI_FAILURE(status))
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warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
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return 0;
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}
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static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
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{
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struct acpiphp_bridge *bridge;
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list_for_each_entry(bridge, &bridge_list, list)
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if (bridge->handle == handle)
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return bridge;
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|
|
|
return NULL;
|
|
}
|
|
|
|
static void cleanup_bridge(struct acpiphp_bridge *bridge)
|
|
{
|
|
struct acpiphp_slot *slot, *next;
|
|
struct acpiphp_func *func, *tmp;
|
|
acpi_status status;
|
|
acpi_handle handle = bridge->handle;
|
|
|
|
status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_bridge);
|
|
if (ACPI_FAILURE(status))
|
|
err("failed to remove notify handler\n");
|
|
|
|
if ((bridge->type != BRIDGE_TYPE_HOST) &&
|
|
((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
|
|
status = acpi_install_notify_handler(bridge->func->handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_func,
|
|
bridge->func);
|
|
if (ACPI_FAILURE(status))
|
|
err("failed to install interrupt notify handler\n");
|
|
}
|
|
|
|
slot = bridge->slots;
|
|
while (slot) {
|
|
next = slot->next;
|
|
list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
|
|
if (is_dock_device(func->handle)) {
|
|
unregister_hotplug_dock_device(func->handle);
|
|
unregister_dock_notifier(&func->nb);
|
|
}
|
|
if (!(func->flags & FUNC_HAS_DCK)) {
|
|
status = acpi_remove_notify_handler(func->handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_func);
|
|
if (ACPI_FAILURE(status))
|
|
err("failed to remove notify handler\n");
|
|
}
|
|
list_del(&func->sibling);
|
|
kfree(func);
|
|
}
|
|
acpiphp_unregister_hotplug_slot(slot);
|
|
list_del(&slot->funcs);
|
|
kfree(slot);
|
|
slot = next;
|
|
}
|
|
|
|
/*
|
|
* Only P2P bridges have a pci_dev
|
|
*/
|
|
if (bridge->pci_dev)
|
|
put_device(&bridge->pci_bus->dev);
|
|
|
|
pci_dev_put(bridge->pci_dev);
|
|
list_del(&bridge->list);
|
|
kfree(bridge);
|
|
}
|
|
|
|
static acpi_status
|
|
cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
|
|
/* cleanup p2p bridges under this P2P bridge
|
|
in a depth-first manner */
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
|
|
cleanup_p2p_bridge, NULL, NULL, NULL);
|
|
|
|
bridge = acpiphp_handle_to_bridge(handle);
|
|
if (bridge)
|
|
cleanup_bridge(bridge);
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static void remove_bridge(acpi_handle handle)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
|
|
/* cleanup p2p bridges under this host bridge
|
|
in a depth-first manner */
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
|
|
(u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
|
|
|
|
/*
|
|
* On root bridges with hotplug slots directly underneath (ie,
|
|
* no p2p bridge between), we call cleanup_bridge().
|
|
*
|
|
* The else clause cleans up root bridges that either had no
|
|
* hotplug slots at all, or had a p2p bridge underneath.
|
|
*/
|
|
bridge = acpiphp_handle_to_bridge(handle);
|
|
if (bridge)
|
|
cleanup_bridge(bridge);
|
|
else
|
|
acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_bridge);
|
|
}
|
|
|
|
static int power_on_slot(struct acpiphp_slot *slot)
|
|
{
|
|
acpi_status status;
|
|
struct acpiphp_func *func;
|
|
int retval = 0;
|
|
|
|
/* if already enabled, just skip */
|
|
if (slot->flags & SLOT_POWEREDON)
|
|
goto err_exit;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->flags & FUNC_HAS_PS0) {
|
|
dbg("%s: executing _PS0\n", __func__);
|
|
status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
warn("%s: _PS0 failed\n", __func__);
|
|
retval = -1;
|
|
goto err_exit;
|
|
} else
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* TBD: evaluate _STA to check if the slot is enabled */
|
|
|
|
slot->flags |= SLOT_POWEREDON;
|
|
|
|
err_exit:
|
|
return retval;
|
|
}
|
|
|
|
|
|
static int power_off_slot(struct acpiphp_slot *slot)
|
|
{
|
|
acpi_status status;
|
|
struct acpiphp_func *func;
|
|
|
|
int retval = 0;
|
|
|
|
/* if already disabled, just skip */
|
|
if ((slot->flags & SLOT_POWEREDON) == 0)
|
|
goto err_exit;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->flags & FUNC_HAS_PS3) {
|
|
status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
warn("%s: _PS3 failed\n", __func__);
|
|
retval = -1;
|
|
goto err_exit;
|
|
} else
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* TBD: evaluate _STA to check if the slot is disabled */
|
|
|
|
slot->flags &= (~SLOT_POWEREDON);
|
|
|
|
err_exit:
|
|
return retval;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* acpiphp_max_busnr - return the highest reserved bus number under the given bus.
|
|
* @bus: bus to start search with
|
|
*/
|
|
static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
|
|
{
|
|
struct list_head *tmp;
|
|
unsigned char max, n;
|
|
|
|
/*
|
|
* pci_bus_max_busnr will return the highest
|
|
* reserved busnr for all these children.
|
|
* that is equivalent to the bus->subordinate
|
|
* value. We don't want to use the parent's
|
|
* bus->subordinate value because it could have
|
|
* padding in it.
|
|
*/
|
|
max = bus->busn_res.start;
|
|
|
|
list_for_each(tmp, &bus->children) {
|
|
n = pci_bus_max_busnr(pci_bus_b(tmp));
|
|
if (n > max)
|
|
max = n;
|
|
}
|
|
return max;
|
|
}
|
|
|
|
|
|
/**
|
|
* acpiphp_bus_add - add a new bus to acpi subsystem
|
|
* @func: acpiphp_func of the bridge
|
|
*/
|
|
static int acpiphp_bus_add(struct acpiphp_func *func)
|
|
{
|
|
acpi_handle phandle;
|
|
struct acpi_device *device, *pdevice;
|
|
int ret_val;
|
|
|
|
acpi_get_parent(func->handle, &phandle);
|
|
if (acpi_bus_get_device(phandle, &pdevice)) {
|
|
dbg("no parent device, assuming NULL\n");
|
|
pdevice = NULL;
|
|
}
|
|
if (!acpi_bus_get_device(func->handle, &device)) {
|
|
dbg("bus exists... trim\n");
|
|
/* this shouldn't be in here, so remove
|
|
* the bus then re-add it...
|
|
*/
|
|
ret_val = acpi_bus_trim(device, 1);
|
|
dbg("acpi_bus_trim return %x\n", ret_val);
|
|
}
|
|
|
|
ret_val = acpi_bus_add(&device, pdevice, func->handle,
|
|
ACPI_BUS_TYPE_DEVICE);
|
|
if (ret_val) {
|
|
dbg("error adding bus, %x\n",
|
|
-ret_val);
|
|
goto acpiphp_bus_add_out;
|
|
}
|
|
ret_val = acpi_bus_start(device);
|
|
|
|
acpiphp_bus_add_out:
|
|
return ret_val;
|
|
}
|
|
|
|
|
|
/**
|
|
* acpiphp_bus_trim - trim a bus from acpi subsystem
|
|
* @handle: handle to acpi namespace
|
|
*/
|
|
static int acpiphp_bus_trim(acpi_handle handle)
|
|
{
|
|
struct acpi_device *device;
|
|
int retval;
|
|
|
|
retval = acpi_bus_get_device(handle, &device);
|
|
if (retval) {
|
|
dbg("acpi_device not found\n");
|
|
return retval;
|
|
}
|
|
|
|
retval = acpi_bus_trim(device, 1);
|
|
if (retval)
|
|
err("cannot remove from acpi list\n");
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
|
|
{
|
|
struct acpiphp_func *func;
|
|
union acpi_object params[2];
|
|
struct acpi_object_list arg_list;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
arg_list.count = 2;
|
|
arg_list.pointer = params;
|
|
params[0].type = ACPI_TYPE_INTEGER;
|
|
params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
|
|
params[1].type = ACPI_TYPE_INTEGER;
|
|
params[1].integer.value = 1;
|
|
/* _REG is optional, we don't care about if there is failure */
|
|
acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* enable_device - enable, configure a slot
|
|
* @slot: slot to be enabled
|
|
*
|
|
* This function should be called per *physical slot*,
|
|
* not per each slot object in ACPI namespace.
|
|
*/
|
|
static int __ref enable_device(struct acpiphp_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
struct pci_bus *bus = slot->bridge->pci_bus;
|
|
struct acpiphp_func *func;
|
|
int retval = 0;
|
|
int num, max, pass;
|
|
acpi_status status;
|
|
|
|
if (slot->flags & SLOT_ENABLED)
|
|
goto err_exit;
|
|
|
|
num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
|
|
if (num == 0) {
|
|
/* Maybe only part of funcs are added. */
|
|
dbg("No new device found\n");
|
|
goto err_exit;
|
|
}
|
|
|
|
max = acpiphp_max_busnr(bus);
|
|
for (pass = 0; pass < 2; pass++) {
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (PCI_SLOT(dev->devfn) != slot->device)
|
|
continue;
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
|
|
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
|
|
max = pci_scan_bridge(bus, dev, max, pass);
|
|
if (pass && dev->subordinate)
|
|
pci_bus_size_bridges(dev->subordinate);
|
|
}
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling)
|
|
acpiphp_bus_add(func);
|
|
|
|
pci_bus_assign_resources(bus);
|
|
acpiphp_sanitize_bus(bus);
|
|
acpiphp_set_hpp_values(bus);
|
|
acpiphp_set_acpi_region(slot);
|
|
pci_enable_bridges(bus);
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
/* Assume that newly added devices are powered on already. */
|
|
if (!dev->is_added)
|
|
dev->current_state = PCI_D0;
|
|
}
|
|
|
|
pci_bus_add_devices(bus);
|
|
|
|
slot->flags |= SLOT_ENABLED;
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
|
|
func->function));
|
|
if (!dev) {
|
|
/* Do not set SLOT_ENABLED flag if some funcs
|
|
are not added. */
|
|
slot->flags &= (~SLOT_ENABLED);
|
|
continue;
|
|
}
|
|
|
|
if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
|
|
dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
|
|
pci_dev_put(dev);
|
|
continue;
|
|
}
|
|
|
|
status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
warn("find_p2p_bridge failed (error code = 0x%x)\n",
|
|
status);
|
|
pci_dev_put(dev);
|
|
}
|
|
|
|
|
|
err_exit:
|
|
return retval;
|
|
}
|
|
|
|
static void disable_bridges(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (dev->subordinate) {
|
|
disable_bridges(dev->subordinate);
|
|
pci_disable_device(dev);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* return first device in slot, acquiring a reference on it */
|
|
static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
|
|
{
|
|
struct pci_bus *bus = slot->bridge->pci_bus;
|
|
struct pci_dev *dev;
|
|
struct pci_dev *ret = NULL;
|
|
|
|
down_read(&pci_bus_sem);
|
|
list_for_each_entry(dev, &bus->devices, bus_list)
|
|
if (PCI_SLOT(dev->devfn) == slot->device) {
|
|
ret = pci_dev_get(dev);
|
|
break;
|
|
}
|
|
up_read(&pci_bus_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* disable_device - disable a slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
static int disable_device(struct acpiphp_slot *slot)
|
|
{
|
|
struct acpiphp_func *func;
|
|
struct pci_dev *pdev;
|
|
struct pci_bus *bus = slot->bridge->pci_bus;
|
|
|
|
/* The slot will be enabled when func 0 is added, so check
|
|
func 0 before disable the slot. */
|
|
pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
|
|
if (!pdev)
|
|
goto err_exit;
|
|
pci_dev_put(pdev);
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->bridge) {
|
|
/* cleanup p2p bridges under this P2P bridge */
|
|
cleanup_p2p_bridge(func->bridge->handle,
|
|
(u32)1, NULL, NULL);
|
|
func->bridge = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* enable_device() enumerates all functions in this device via
|
|
* pci_scan_slot(), whether they have associated ACPI hotplug
|
|
* methods (_EJ0, etc.) or not. Therefore, we remove all functions
|
|
* here.
|
|
*/
|
|
while ((pdev = dev_in_slot(slot))) {
|
|
pci_stop_bus_device(pdev);
|
|
if (pdev->subordinate) {
|
|
disable_bridges(pdev->subordinate);
|
|
pci_disable_device(pdev);
|
|
}
|
|
__pci_remove_bus_device(pdev);
|
|
pci_dev_put(pdev);
|
|
}
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
acpiphp_bus_trim(func->handle);
|
|
}
|
|
|
|
slot->flags &= (~SLOT_ENABLED);
|
|
|
|
err_exit:
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* get_slot_status - get ACPI slot status
|
|
* @slot: ACPI PHP slot
|
|
*
|
|
* If a slot has _STA for each function and if any one of them
|
|
* returned non-zero status, return it.
|
|
*
|
|
* If a slot doesn't have _STA and if any one of its functions'
|
|
* configuration space is configured, return 0x0f as a _STA.
|
|
*
|
|
* Otherwise return 0.
|
|
*/
|
|
static unsigned int get_slot_status(struct acpiphp_slot *slot)
|
|
{
|
|
acpi_status status;
|
|
unsigned long long sta = 0;
|
|
u32 dvid;
|
|
struct acpiphp_func *func;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->flags & FUNC_HAS_STA) {
|
|
status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
|
|
if (ACPI_SUCCESS(status) && sta)
|
|
break;
|
|
} else {
|
|
pci_bus_read_config_dword(slot->bridge->pci_bus,
|
|
PCI_DEVFN(slot->device,
|
|
func->function),
|
|
PCI_VENDOR_ID, &dvid);
|
|
if (dvid != 0xffffffff) {
|
|
sta = ACPI_STA_ALL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (unsigned int)sta;
|
|
}
|
|
|
|
/**
|
|
* acpiphp_eject_slot - physically eject the slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
int acpiphp_eject_slot(struct acpiphp_slot *slot)
|
|
{
|
|
acpi_status status;
|
|
struct acpiphp_func *func;
|
|
struct acpi_object_list arg_list;
|
|
union acpi_object arg;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
/* We don't want to call _EJ0 on non-existing functions. */
|
|
if ((func->flags & FUNC_HAS_EJ0)) {
|
|
/* _EJ0 method take one argument */
|
|
arg_list.count = 1;
|
|
arg_list.pointer = &arg;
|
|
arg.type = ACPI_TYPE_INTEGER;
|
|
arg.integer.value = 1;
|
|
|
|
status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
warn("%s: _EJ0 failed\n", __func__);
|
|
return -1;
|
|
} else
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpiphp_check_bridge - re-enumerate devices
|
|
* @bridge: where to begin re-enumeration
|
|
*
|
|
* Iterate over all slots under this bridge and make sure that if a
|
|
* card is present they are enabled, and if not they are disabled.
|
|
*/
|
|
static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
|
|
{
|
|
struct acpiphp_slot *slot;
|
|
int retval = 0;
|
|
int enabled, disabled;
|
|
|
|
enabled = disabled = 0;
|
|
|
|
for (slot = bridge->slots; slot; slot = slot->next) {
|
|
unsigned int status = get_slot_status(slot);
|
|
if (slot->flags & SLOT_ENABLED) {
|
|
if (status == ACPI_STA_ALL)
|
|
continue;
|
|
retval = acpiphp_disable_slot(slot);
|
|
if (retval) {
|
|
err("Error occurred in disabling\n");
|
|
goto err_exit;
|
|
} else {
|
|
acpiphp_eject_slot(slot);
|
|
}
|
|
disabled++;
|
|
} else {
|
|
if (status != ACPI_STA_ALL)
|
|
continue;
|
|
retval = acpiphp_enable_slot(slot);
|
|
if (retval) {
|
|
err("Error occurred in enabling\n");
|
|
goto err_exit;
|
|
}
|
|
enabled++;
|
|
}
|
|
}
|
|
|
|
dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
|
|
|
|
err_exit:
|
|
return retval;
|
|
}
|
|
|
|
static void acpiphp_set_hpp_values(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list)
|
|
pci_configure_slot(dev);
|
|
}
|
|
|
|
/*
|
|
* Remove devices for which we could not assign resources, call
|
|
* arch specific code to fix-up the bus
|
|
*/
|
|
static void acpiphp_sanitize_bus(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
int i;
|
|
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
|
|
struct resource *res = &dev->resource[i];
|
|
if ((res->flags & type_mask) && !res->start &&
|
|
res->end) {
|
|
/* Could not assign a required resources
|
|
* for this device, remove it */
|
|
pci_stop_and_remove_bus_device(dev);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Program resources in newly inserted bridge */
|
|
static int acpiphp_configure_bridge (acpi_handle handle)
|
|
{
|
|
struct pci_bus *bus;
|
|
|
|
if (acpi_is_root_bridge(handle)) {
|
|
struct acpi_pci_root *root = acpi_pci_find_root(handle);
|
|
bus = root->bus;
|
|
} else {
|
|
struct pci_dev *pdev = acpi_get_pci_dev(handle);
|
|
bus = pdev->subordinate;
|
|
pci_dev_put(pdev);
|
|
}
|
|
|
|
pci_bus_size_bridges(bus);
|
|
pci_bus_assign_resources(bus);
|
|
acpiphp_sanitize_bus(bus);
|
|
acpiphp_set_hpp_values(bus);
|
|
pci_enable_bridges(bus);
|
|
return 0;
|
|
}
|
|
|
|
static void handle_bridge_insertion(acpi_handle handle, u32 type)
|
|
{
|
|
struct acpi_device *device, *pdevice;
|
|
acpi_handle phandle;
|
|
|
|
if ((type != ACPI_NOTIFY_BUS_CHECK) &&
|
|
(type != ACPI_NOTIFY_DEVICE_CHECK)) {
|
|
err("unexpected notification type %d\n", type);
|
|
return;
|
|
}
|
|
|
|
acpi_get_parent(handle, &phandle);
|
|
if (acpi_bus_get_device(phandle, &pdevice)) {
|
|
dbg("no parent device, assuming NULL\n");
|
|
pdevice = NULL;
|
|
}
|
|
if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
|
|
err("cannot add bridge to acpi list\n");
|
|
return;
|
|
}
|
|
if (!acpiphp_configure_bridge(handle) &&
|
|
!acpi_bus_start(device))
|
|
add_bridge(handle);
|
|
else
|
|
err("cannot configure and start bridge\n");
|
|
|
|
}
|
|
|
|
/*
|
|
* ACPI event handlers
|
|
*/
|
|
|
|
static acpi_status
|
|
count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
int *count = (int *)context;
|
|
struct acpiphp_bridge *bridge;
|
|
|
|
bridge = acpiphp_handle_to_bridge(handle);
|
|
if (bridge)
|
|
(*count)++;
|
|
return AE_OK ;
|
|
}
|
|
|
|
static acpi_status
|
|
check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
char objname[64];
|
|
struct acpi_buffer buffer = { .length = sizeof(objname),
|
|
.pointer = objname };
|
|
|
|
bridge = acpiphp_handle_to_bridge(handle);
|
|
if (bridge) {
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
dbg("%s: re-enumerating slots under %s\n",
|
|
__func__, objname);
|
|
acpiphp_check_bridge(bridge);
|
|
}
|
|
return AE_OK ;
|
|
}
|
|
|
|
struct acpiphp_hp_work {
|
|
struct work_struct work;
|
|
acpi_handle handle;
|
|
u32 type;
|
|
void *context;
|
|
};
|
|
|
|
static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type,
|
|
void *context,
|
|
void (*func)(struct work_struct *work))
|
|
{
|
|
struct acpiphp_hp_work *hp_work;
|
|
int ret;
|
|
|
|
hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
|
|
if (!hp_work)
|
|
return;
|
|
|
|
hp_work->handle = handle;
|
|
hp_work->type = type;
|
|
hp_work->context = context;
|
|
|
|
INIT_WORK(&hp_work->work, func);
|
|
ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
|
|
if (!ret)
|
|
kfree(hp_work);
|
|
}
|
|
|
|
static void _handle_hotplug_event_bridge(struct work_struct *work)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
char objname[64];
|
|
struct acpi_buffer buffer = { .length = sizeof(objname),
|
|
.pointer = objname };
|
|
struct acpi_device *device;
|
|
int num_sub_bridges = 0;
|
|
struct acpiphp_hp_work *hp_work;
|
|
acpi_handle handle;
|
|
u32 type;
|
|
|
|
hp_work = container_of(work, struct acpiphp_hp_work, work);
|
|
handle = hp_work->handle;
|
|
type = hp_work->type;
|
|
|
|
if (acpi_bus_get_device(handle, &device)) {
|
|
/* This bridge must have just been physically inserted */
|
|
handle_bridge_insertion(handle, type);
|
|
goto out;
|
|
}
|
|
|
|
bridge = acpiphp_handle_to_bridge(handle);
|
|
if (type == ACPI_NOTIFY_BUS_CHECK) {
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
|
|
count_sub_bridges, NULL, &num_sub_bridges, NULL);
|
|
}
|
|
|
|
if (!bridge && !num_sub_bridges) {
|
|
err("cannot get bridge info\n");
|
|
goto out;
|
|
}
|
|
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
|
|
switch (type) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
/* bus re-enumerate */
|
|
dbg("%s: Bus check notify on %s\n", __func__, objname);
|
|
if (bridge) {
|
|
dbg("%s: re-enumerating slots under %s\n",
|
|
__func__, objname);
|
|
acpiphp_check_bridge(bridge);
|
|
}
|
|
if (num_sub_bridges)
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
|
|
ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
/* device check */
|
|
dbg("%s: Device check notify on %s\n", __func__, objname);
|
|
acpiphp_check_bridge(bridge);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_WAKE:
|
|
/* wake event */
|
|
dbg("%s: Device wake notify on %s\n", __func__, objname);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
/* request device eject */
|
|
dbg("%s: Device eject notify on %s\n", __func__, objname);
|
|
if ((bridge->type != BRIDGE_TYPE_HOST) &&
|
|
(bridge->flags & BRIDGE_HAS_EJ0)) {
|
|
struct acpiphp_slot *slot;
|
|
slot = bridge->func->slot;
|
|
if (!acpiphp_disable_slot(slot))
|
|
acpiphp_eject_slot(slot);
|
|
}
|
|
break;
|
|
|
|
case ACPI_NOTIFY_FREQUENCY_MISMATCH:
|
|
printk(KERN_ERR "Device %s cannot be configured due"
|
|
" to a frequency mismatch\n", objname);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_BUS_MODE_MISMATCH:
|
|
printk(KERN_ERR "Device %s cannot be configured due"
|
|
" to a bus mode mismatch\n", objname);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_POWER_FAULT:
|
|
printk(KERN_ERR "Device %s has suffered a power fault\n",
|
|
objname);
|
|
break;
|
|
|
|
default:
|
|
warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
|
|
break;
|
|
}
|
|
|
|
out:
|
|
kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
|
|
}
|
|
|
|
/**
|
|
* handle_hotplug_event_bridge - handle ACPI event on bridges
|
|
* @handle: Notify()'ed acpi_handle
|
|
* @type: Notify code
|
|
* @context: pointer to acpiphp_bridge structure
|
|
*
|
|
* Handles ACPI event notification on {host,p2p} bridges.
|
|
*/
|
|
static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
|
|
void *context)
|
|
{
|
|
/*
|
|
* Currently the code adds all hotplug events to the kacpid_wq
|
|
* queue when it should add hotplug events to the kacpi_hotplug_wq.
|
|
* The proper way to fix this is to reorganize the code so that
|
|
* drivers (dock, etc.) do not call acpi_os_execute(), etc.
|
|
* For now just re-add this work to the kacpi_hotplug_wq so we
|
|
* don't deadlock on hotplug actions.
|
|
*/
|
|
alloc_acpiphp_hp_work(handle, type, context,
|
|
_handle_hotplug_event_bridge);
|
|
}
|
|
|
|
static void _handle_hotplug_event_func(struct work_struct *work)
|
|
{
|
|
struct acpiphp_func *func;
|
|
char objname[64];
|
|
struct acpi_buffer buffer = { .length = sizeof(objname),
|
|
.pointer = objname };
|
|
struct acpiphp_hp_work *hp_work;
|
|
acpi_handle handle;
|
|
u32 type;
|
|
void *context;
|
|
|
|
hp_work = container_of(work, struct acpiphp_hp_work, work);
|
|
handle = hp_work->handle;
|
|
type = hp_work->type;
|
|
context = hp_work->context;
|
|
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
|
|
func = (struct acpiphp_func *)context;
|
|
|
|
switch (type) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
/* bus re-enumerate */
|
|
dbg("%s: Bus check notify on %s\n", __func__, objname);
|
|
acpiphp_enable_slot(func->slot);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
/* device check : re-enumerate from parent bus */
|
|
dbg("%s: Device check notify on %s\n", __func__, objname);
|
|
acpiphp_check_bridge(func->slot->bridge);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_WAKE:
|
|
/* wake event */
|
|
dbg("%s: Device wake notify on %s\n", __func__, objname);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
/* request device eject */
|
|
dbg("%s: Device eject notify on %s\n", __func__, objname);
|
|
if (!(acpiphp_disable_slot(func->slot)))
|
|
acpiphp_eject_slot(func->slot);
|
|
break;
|
|
|
|
default:
|
|
warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
|
|
break;
|
|
}
|
|
|
|
kfree(hp_work); /* allocated in handle_hotplug_event_func */
|
|
}
|
|
|
|
/**
|
|
* handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
|
|
* @handle: Notify()'ed acpi_handle
|
|
* @type: Notify code
|
|
* @context: pointer to acpiphp_func structure
|
|
*
|
|
* Handles ACPI event notification on slots.
|
|
*/
|
|
static void handle_hotplug_event_func(acpi_handle handle, u32 type,
|
|
void *context)
|
|
{
|
|
/*
|
|
* Currently the code adds all hotplug events to the kacpid_wq
|
|
* queue when it should add hotplug events to the kacpi_hotplug_wq.
|
|
* The proper way to fix this is to reorganize the code so that
|
|
* drivers (dock, etc.) do not call acpi_os_execute(), etc.
|
|
* For now just re-add this work to the kacpi_hotplug_wq so we
|
|
* don't deadlock on hotplug actions.
|
|
*/
|
|
alloc_acpiphp_hp_work(handle, type, context,
|
|
_handle_hotplug_event_func);
|
|
}
|
|
|
|
static acpi_status
|
|
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
int *count = (int *)context;
|
|
|
|
if (!acpi_is_root_bridge(handle))
|
|
return AE_OK;
|
|
|
|
(*count)++;
|
|
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_bridge, NULL);
|
|
|
|
return AE_OK ;
|
|
}
|
|
|
|
static struct acpi_pci_driver acpi_pci_hp_driver = {
|
|
.add = add_bridge,
|
|
.remove = remove_bridge,
|
|
};
|
|
|
|
/**
|
|
* acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
|
|
*/
|
|
int __init acpiphp_glue_init(void)
|
|
{
|
|
int num = 0;
|
|
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
|
|
|
|
if (num <= 0)
|
|
return -1;
|
|
else
|
|
acpi_pci_register_driver(&acpi_pci_hp_driver);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
|
|
*
|
|
* This function frees all data allocated in acpiphp_glue_init().
|
|
*/
|
|
void acpiphp_glue_exit(void)
|
|
{
|
|
acpi_pci_unregister_driver(&acpi_pci_hp_driver);
|
|
}
|
|
|
|
|
|
/**
|
|
* acpiphp_get_num_slots - count number of slots in a system
|
|
*/
|
|
int __init acpiphp_get_num_slots(void)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
int num_slots = 0;
|
|
|
|
list_for_each_entry(bridge, &bridge_list, list) {
|
|
dbg("Bus %04x:%02x has %d slot%s\n",
|
|
pci_domain_nr(bridge->pci_bus),
|
|
bridge->pci_bus->number, bridge->nr_slots,
|
|
bridge->nr_slots == 1 ? "" : "s");
|
|
num_slots += bridge->nr_slots;
|
|
}
|
|
|
|
dbg("Total %d slots\n", num_slots);
|
|
return num_slots;
|
|
}
|
|
|
|
|
|
#if 0
|
|
/**
|
|
* acpiphp_for_each_slot - call function for each slot
|
|
* @fn: callback function
|
|
* @data: context to be passed to callback function
|
|
*/
|
|
static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
|
|
{
|
|
struct list_head *node;
|
|
struct acpiphp_bridge *bridge;
|
|
struct acpiphp_slot *slot;
|
|
int retval = 0;
|
|
|
|
list_for_each (node, &bridge_list) {
|
|
bridge = (struct acpiphp_bridge *)node;
|
|
for (slot = bridge->slots; slot; slot = slot->next) {
|
|
retval = fn(slot, data);
|
|
if (!retval)
|
|
goto err_exit;
|
|
}
|
|
}
|
|
|
|
err_exit:
|
|
return retval;
|
|
}
|
|
#endif
|
|
|
|
|
|
/**
|
|
* acpiphp_enable_slot - power on slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
int acpiphp_enable_slot(struct acpiphp_slot *slot)
|
|
{
|
|
int retval;
|
|
|
|
mutex_lock(&slot->crit_sect);
|
|
|
|
/* wake up all functions */
|
|
retval = power_on_slot(slot);
|
|
if (retval)
|
|
goto err_exit;
|
|
|
|
if (get_slot_status(slot) == ACPI_STA_ALL) {
|
|
/* configure all functions */
|
|
retval = enable_device(slot);
|
|
if (retval)
|
|
power_off_slot(slot);
|
|
} else {
|
|
dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
|
|
power_off_slot(slot);
|
|
}
|
|
|
|
err_exit:
|
|
mutex_unlock(&slot->crit_sect);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* acpiphp_disable_slot - power off slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
int acpiphp_disable_slot(struct acpiphp_slot *slot)
|
|
{
|
|
int retval = 0;
|
|
|
|
mutex_lock(&slot->crit_sect);
|
|
|
|
/* unconfigure all functions */
|
|
retval = disable_device(slot);
|
|
if (retval)
|
|
goto err_exit;
|
|
|
|
/* power off all functions */
|
|
retval = power_off_slot(slot);
|
|
if (retval)
|
|
goto err_exit;
|
|
|
|
err_exit:
|
|
mutex_unlock(&slot->crit_sect);
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*
|
|
* slot enabled: 1
|
|
* slot disabled: 0
|
|
*/
|
|
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
|
|
{
|
|
return (slot->flags & SLOT_POWEREDON);
|
|
}
|
|
|
|
|
|
/*
|
|
* latch open: 1
|
|
* latch closed: 0
|
|
*/
|
|
u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
|
|
{
|
|
unsigned int sta;
|
|
|
|
sta = get_slot_status(slot);
|
|
|
|
return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* adapter presence : 1
|
|
* absence : 0
|
|
*/
|
|
u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
|
|
{
|
|
unsigned int sta;
|
|
|
|
sta = get_slot_status(slot);
|
|
|
|
return (sta == 0) ? 0 : 1;
|
|
}
|