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![Andy Shevchenko](/assets/img/avatar_default.png)
The following pattern is often used: list_for_each_entry(dev, &bus->devices, bus_list) { if (pci_is_bridge(dev)) { ... } } Add a for_each_pci_bridge() helper to make that code easier to write and read by reducing indentation level. It also saves one or few lines of code in each occurrence. Convert PCI core parts here at the same time. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> [bhelgaas: fold in http://lkml.kernel.org/r/20171013165352.25550-1-andriy.shevchenko@linux.intel.com] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
1011 lines
25 KiB
C
1011 lines
25 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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#define pr_fmt(fmt) "acpiphp_glue: " fmt
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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/pm_runtime.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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static DEFINE_MUTEX(bridge_mutex);
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static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type);
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static void acpiphp_post_dock_fixup(struct acpi_device *adev);
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static void acpiphp_sanitize_bus(struct pci_bus *bus);
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static void hotplug_event(u32 type, struct acpiphp_context *context);
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static void free_bridge(struct kref *kref);
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/**
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* acpiphp_init_context - Create hotplug context and grab a reference to it.
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* @adev: ACPI device object to create the context for.
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*
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* Call under acpi_hp_context_lock.
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*/
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static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev)
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{
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struct acpiphp_context *context;
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context = kzalloc(sizeof(*context), GFP_KERNEL);
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if (!context)
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return NULL;
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context->refcount = 1;
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context->hp.notify = acpiphp_hotplug_notify;
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context->hp.fixup = acpiphp_post_dock_fixup;
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acpi_set_hp_context(adev, &context->hp);
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return context;
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}
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/**
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* acpiphp_get_context - Get hotplug context and grab a reference to it.
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* @adev: ACPI device object to get the context for.
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*
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* Call under acpi_hp_context_lock.
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*/
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static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev)
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{
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struct acpiphp_context *context;
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if (!adev->hp)
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return NULL;
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context = to_acpiphp_context(adev->hp);
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context->refcount++;
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return context;
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}
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/**
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* acpiphp_put_context - Drop a reference to ACPI hotplug context.
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* @context: ACPI hotplug context to drop a reference to.
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*
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* The context object is removed if there are no more references to it.
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*
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* Call under acpi_hp_context_lock.
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*/
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static void acpiphp_put_context(struct acpiphp_context *context)
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{
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if (--context->refcount)
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return;
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WARN_ON(context->bridge);
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context->hp.self->hp = NULL;
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kfree(context);
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}
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static inline void get_bridge(struct acpiphp_bridge *bridge)
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{
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kref_get(&bridge->ref);
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}
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static inline void put_bridge(struct acpiphp_bridge *bridge)
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{
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kref_put(&bridge->ref, free_bridge);
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}
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static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev)
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{
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struct acpiphp_context *context;
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acpi_lock_hp_context();
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context = acpiphp_get_context(adev);
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if (!context || context->func.parent->is_going_away) {
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acpi_unlock_hp_context();
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return NULL;
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}
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get_bridge(context->func.parent);
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acpiphp_put_context(context);
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acpi_unlock_hp_context();
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return context;
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}
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static void acpiphp_let_context_go(struct acpiphp_context *context)
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{
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put_bridge(context->func.parent);
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}
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static void free_bridge(struct kref *kref)
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{
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struct acpiphp_context *context;
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struct acpiphp_bridge *bridge;
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struct acpiphp_slot *slot, *next;
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struct acpiphp_func *func, *tmp;
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acpi_lock_hp_context();
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bridge = container_of(kref, struct acpiphp_bridge, ref);
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list_for_each_entry_safe(slot, next, &bridge->slots, node) {
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list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
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acpiphp_put_context(func_to_context(func));
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kfree(slot);
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}
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context = bridge->context;
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/* Root bridges will not have hotplug context. */
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if (context) {
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/* Release the reference taken by acpiphp_enumerate_slots(). */
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put_bridge(context->func.parent);
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context->bridge = NULL;
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acpiphp_put_context(context);
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}
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put_device(&bridge->pci_bus->dev);
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pci_dev_put(bridge->pci_dev);
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kfree(bridge);
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acpi_unlock_hp_context();
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}
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/**
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* acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.
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* @adev: ACPI device object corresponding to a PCI device.
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*
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* TBD - figure out a way to only call fixups for systems that require them.
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*/
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static void acpiphp_post_dock_fixup(struct acpi_device *adev)
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{
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struct acpiphp_context *context = acpiphp_grab_context(adev);
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struct pci_bus *bus;
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u32 buses;
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if (!context)
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return;
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bus = context->func.slot->bus;
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if (!bus->self)
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goto out;
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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, PCI_PRIMARY_BUS, &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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out:
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acpiphp_let_context_go(context);
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}
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/**
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* acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
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* @handle: ACPI handle of the object to add a context to.
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* @lvl: Not used.
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* @data: The object's parent ACPIPHP bridge.
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* @rv: Not used.
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*/
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static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data,
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void **rv)
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{
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struct acpiphp_bridge *bridge = data;
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struct acpiphp_context *context;
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struct acpi_device *adev;
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struct acpiphp_slot *slot;
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struct acpiphp_func *newfunc;
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acpi_status status = AE_OK;
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unsigned long long adr;
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int device, function;
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struct pci_bus *pbus = bridge->pci_bus;
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struct pci_dev *pdev = bridge->pci_dev;
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u32 val;
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status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
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if (ACPI_FAILURE(status)) {
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if (status != AE_NOT_FOUND)
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acpi_handle_warn(handle,
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"can't evaluate _ADR (%#x)\n", status);
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return AE_OK;
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}
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if (acpi_bus_get_device(handle, &adev))
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return AE_OK;
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device = (adr >> 16) & 0xffff;
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function = adr & 0xffff;
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acpi_lock_hp_context();
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context = acpiphp_init_context(adev);
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if (!context) {
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acpi_unlock_hp_context();
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acpi_handle_err(handle, "No hotplug context\n");
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return AE_NOT_EXIST;
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}
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newfunc = &context->func;
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newfunc->function = function;
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newfunc->parent = bridge;
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acpi_unlock_hp_context();
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/*
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* If this is a dock device, its _EJ0 should be executed by the dock
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* notify handler after calling _DCK.
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*/
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if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))
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newfunc->flags = FUNC_HAS_EJ0;
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if (acpi_has_method(handle, "_STA"))
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newfunc->flags |= FUNC_HAS_STA;
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/* search for objects that share the same slot */
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list_for_each_entry(slot, &bridge->slots, node)
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if (slot->device == device)
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goto slot_found;
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slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
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if (!slot) {
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acpi_lock_hp_context();
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acpiphp_put_context(context);
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acpi_unlock_hp_context();
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return AE_NO_MEMORY;
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}
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slot->bus = bridge->pci_bus;
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slot->device = device;
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INIT_LIST_HEAD(&slot->funcs);
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list_add_tail(&slot->node, &bridge->slots);
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/*
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* Expose slots to user space for functions that have _EJ0 or _RMV or
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* are located in dock stations. Do not expose them for devices handled
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* by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
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* expose slots to user space in those cases.
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*/
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if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev))
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&& !(pdev && pdev->is_hotplug_bridge && pciehp_is_native(pdev))) {
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unsigned long long sun;
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int retval;
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bridge->nr_slots++;
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status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
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if (ACPI_FAILURE(status))
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sun = bridge->nr_slots;
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pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
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sun, pci_domain_nr(pbus), pbus->number, device);
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retval = acpiphp_register_hotplug_slot(slot, sun);
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if (retval) {
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slot->slot = NULL;
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bridge->nr_slots--;
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if (retval == -EBUSY)
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pr_warn("Slot %llu already registered by another hotplug driver\n", sun);
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else
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pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval);
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}
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/* Even if the slot registration fails, we can still use it. */
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}
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slot_found:
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newfunc->slot = slot;
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list_add_tail(&newfunc->sibling, &slot->funcs);
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if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
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&val, 60*1000))
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slot->flags |= SLOT_ENABLED;
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return AE_OK;
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}
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static void cleanup_bridge(struct acpiphp_bridge *bridge)
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{
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struct acpiphp_slot *slot;
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struct acpiphp_func *func;
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list_for_each_entry(slot, &bridge->slots, node) {
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list_for_each_entry(func, &slot->funcs, sibling) {
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struct acpi_device *adev = func_to_acpi_device(func);
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acpi_lock_hp_context();
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adev->hp->notify = NULL;
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adev->hp->fixup = NULL;
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acpi_unlock_hp_context();
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}
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slot->flags |= SLOT_IS_GOING_AWAY;
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if (slot->slot)
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acpiphp_unregister_hotplug_slot(slot);
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}
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mutex_lock(&bridge_mutex);
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list_del(&bridge->list);
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mutex_unlock(&bridge_mutex);
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acpi_lock_hp_context();
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bridge->is_going_away = true;
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acpi_unlock_hp_context();
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}
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/**
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* acpiphp_max_busnr - return the highest reserved bus number under the given bus.
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* @bus: bus to start search with
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*/
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static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
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{
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struct pci_bus *tmp;
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unsigned char max, n;
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/*
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* pci_bus_max_busnr will return the highest
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* reserved busnr for all these children.
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* that is equivalent to the bus->subordinate
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* value. We don't want to use the parent's
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* bus->subordinate value because it could have
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* padding in it.
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*/
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max = bus->busn_res.start;
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list_for_each_entry(tmp, &bus->children, node) {
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n = pci_bus_max_busnr(tmp);
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if (n > max)
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max = n;
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}
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return max;
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}
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static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
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{
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struct acpiphp_func *func;
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union acpi_object params[2];
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struct acpi_object_list arg_list;
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list_for_each_entry(func, &slot->funcs, sibling) {
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arg_list.count = 2;
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arg_list.pointer = params;
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params[0].type = ACPI_TYPE_INTEGER;
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params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
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params[1].type = ACPI_TYPE_INTEGER;
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params[1].integer.value = 1;
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/* _REG is optional, we don't care about if there is failure */
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acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
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NULL);
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}
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}
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|
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static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
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{
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struct acpiphp_func *func;
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/* quirk, or pcie could set it already */
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if (dev->is_hotplug_bridge)
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return;
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list_for_each_entry(func, &slot->funcs, sibling) {
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if (PCI_FUNC(dev->devfn) == func->function) {
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dev->is_hotplug_bridge = 1;
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break;
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}
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}
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}
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|
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static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
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{
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struct acpiphp_func *func;
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list_for_each_entry(func, &slot->funcs, sibling) {
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struct acpi_device *adev = func_to_acpi_device(func);
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|
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acpi_bus_scan(adev->handle);
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if (acpi_device_enumerated(adev))
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acpi_device_set_power(adev, ACPI_STATE_D0);
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}
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return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
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}
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|
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/**
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* enable_slot - enable, configure a slot
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* @slot: slot to be enabled
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*
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* This function should be called per *physical slot*,
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* not per each slot object in ACPI namespace.
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*/
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static void enable_slot(struct acpiphp_slot *slot)
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{
|
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struct pci_dev *dev;
|
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struct pci_bus *bus = slot->bus;
|
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struct acpiphp_func *func;
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int max, pass;
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LIST_HEAD(add_list);
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|
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acpiphp_rescan_slot(slot);
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max = acpiphp_max_busnr(bus);
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for (pass = 0; pass < 2; pass++) {
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for_each_pci_bridge(dev, bus) {
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if (PCI_SLOT(dev->devfn) != slot->device)
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continue;
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|
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max = pci_scan_bridge(bus, dev, max, pass);
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if (pass && dev->subordinate) {
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check_hotplug_bridge(slot, dev);
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pcibios_resource_survey_bus(dev->subordinate);
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__pci_bus_size_bridges(dev->subordinate, &add_list);
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}
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}
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}
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__pci_bus_assign_resources(bus, &add_list, NULL);
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|
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acpiphp_sanitize_bus(bus);
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pcie_bus_configure_settings(bus);
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acpiphp_set_acpi_region(slot);
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|
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list_for_each_entry(dev, &bus->devices, bus_list) {
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/* 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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* disable_slot - disable a slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
static void disable_slot(struct acpiphp_slot *slot)
|
|
{
|
|
struct pci_bus *bus = slot->bus;
|
|
struct pci_dev *dev, *prev;
|
|
struct acpiphp_func *func;
|
|
|
|
/*
|
|
* enable_slot() 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.
|
|
*/
|
|
list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
|
|
if (PCI_SLOT(dev->devfn) == slot->device)
|
|
pci_stop_and_remove_bus_device(dev);
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling)
|
|
acpi_bus_trim(func_to_acpi_device(func));
|
|
|
|
slot->flags &= (~SLOT_ENABLED);
|
|
}
|
|
|
|
static bool slot_no_hotplug(struct acpiphp_slot *slot)
|
|
{
|
|
struct pci_bus *bus = slot->bus;
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
unsigned long long sta = 0;
|
|
struct acpiphp_func *func;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->flags & FUNC_HAS_STA) {
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_integer(func_to_handle(func),
|
|
"_STA", NULL, &sta);
|
|
if (ACPI_SUCCESS(status) && sta)
|
|
break;
|
|
} else {
|
|
u32 dvid;
|
|
|
|
pci_bus_read_config_dword(slot->bus,
|
|
PCI_DEVFN(slot->device,
|
|
func->function),
|
|
PCI_VENDOR_ID, &dvid);
|
|
if (dvid != 0xffffffff) {
|
|
sta = ACPI_STA_ALL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (unsigned int)sta;
|
|
}
|
|
|
|
static inline bool device_status_valid(unsigned int sta)
|
|
{
|
|
/*
|
|
* ACPI spec says that _STA may return bit 0 clear with bit 3 set
|
|
* if the device is valid but does not require a device driver to be
|
|
* loaded (Section 6.3.7 of ACPI 5.0A).
|
|
*/
|
|
unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
|
|
return (sta & mask) == mask;
|
|
}
|
|
|
|
/**
|
|
* trim_stale_devices - remove PCI devices that are not responding.
|
|
* @dev: PCI device to start walking the hierarchy from.
|
|
*/
|
|
static void trim_stale_devices(struct pci_dev *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
|
|
struct pci_bus *bus = dev->subordinate;
|
|
bool alive = dev->ignore_hotplug;
|
|
|
|
if (adev) {
|
|
acpi_status status;
|
|
unsigned long long sta;
|
|
|
|
status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
|
|
alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta));
|
|
}
|
|
if (!alive)
|
|
alive = pci_device_is_present(dev);
|
|
|
|
if (!alive) {
|
|
pci_stop_and_remove_bus_device(dev);
|
|
if (adev)
|
|
acpi_bus_trim(adev);
|
|
} else if (bus) {
|
|
struct pci_dev *child, *tmp;
|
|
|
|
/* The device is a bridge. so check the bus below it. */
|
|
pm_runtime_get_sync(&dev->dev);
|
|
list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
|
|
trim_stale_devices(child);
|
|
|
|
pm_runtime_put(&dev->dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
|
|
{
|
|
struct acpiphp_slot *slot;
|
|
|
|
/* Bail out if the bridge is going away. */
|
|
if (bridge->is_going_away)
|
|
return;
|
|
|
|
if (bridge->pci_dev)
|
|
pm_runtime_get_sync(&bridge->pci_dev->dev);
|
|
|
|
list_for_each_entry(slot, &bridge->slots, node) {
|
|
struct pci_bus *bus = slot->bus;
|
|
struct pci_dev *dev, *tmp;
|
|
|
|
if (slot_no_hotplug(slot)) {
|
|
; /* do nothing */
|
|
} else if (device_status_valid(get_slot_status(slot))) {
|
|
/* remove stale devices if any */
|
|
list_for_each_entry_safe_reverse(dev, tmp,
|
|
&bus->devices, bus_list)
|
|
if (PCI_SLOT(dev->devfn) == slot->device)
|
|
trim_stale_devices(dev);
|
|
|
|
/* configure all functions */
|
|
enable_slot(slot);
|
|
} else {
|
|
disable_slot(slot);
|
|
}
|
|
}
|
|
|
|
if (bridge->pci_dev)
|
|
pm_runtime_put(&bridge->pci_dev->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, *tmp;
|
|
int i;
|
|
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
|
|
|
|
list_for_each_entry_safe_reverse(dev, tmp, &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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ACPI event handlers
|
|
*/
|
|
|
|
void acpiphp_check_host_bridge(struct acpi_device *adev)
|
|
{
|
|
struct acpiphp_bridge *bridge = NULL;
|
|
|
|
acpi_lock_hp_context();
|
|
if (adev->hp) {
|
|
bridge = to_acpiphp_root_context(adev->hp)->root_bridge;
|
|
if (bridge)
|
|
get_bridge(bridge);
|
|
}
|
|
acpi_unlock_hp_context();
|
|
if (bridge) {
|
|
pci_lock_rescan_remove();
|
|
|
|
acpiphp_check_bridge(bridge);
|
|
|
|
pci_unlock_rescan_remove();
|
|
put_bridge(bridge);
|
|
}
|
|
}
|
|
|
|
static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
|
|
|
|
static void hotplug_event(u32 type, struct acpiphp_context *context)
|
|
{
|
|
acpi_handle handle = context->hp.self->handle;
|
|
struct acpiphp_func *func = &context->func;
|
|
struct acpiphp_slot *slot = func->slot;
|
|
struct acpiphp_bridge *bridge;
|
|
|
|
acpi_lock_hp_context();
|
|
bridge = context->bridge;
|
|
if (bridge)
|
|
get_bridge(bridge);
|
|
|
|
acpi_unlock_hp_context();
|
|
|
|
pci_lock_rescan_remove();
|
|
|
|
switch (type) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
/* bus re-enumerate */
|
|
acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
|
|
if (bridge)
|
|
acpiphp_check_bridge(bridge);
|
|
else if (!(slot->flags & SLOT_IS_GOING_AWAY))
|
|
enable_slot(slot);
|
|
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
/* device check */
|
|
acpi_handle_debug(handle, "Device check in %s()\n", __func__);
|
|
if (bridge) {
|
|
acpiphp_check_bridge(bridge);
|
|
} else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
|
|
/*
|
|
* Check if anything has changed in the slot and rescan
|
|
* from the parent if that's the case.
|
|
*/
|
|
if (acpiphp_rescan_slot(slot))
|
|
acpiphp_check_bridge(func->parent);
|
|
}
|
|
break;
|
|
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
/* request device eject */
|
|
acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
|
|
acpiphp_disable_and_eject_slot(slot);
|
|
break;
|
|
}
|
|
|
|
pci_unlock_rescan_remove();
|
|
if (bridge)
|
|
put_bridge(bridge);
|
|
}
|
|
|
|
static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
|
|
{
|
|
struct acpiphp_context *context;
|
|
|
|
context = acpiphp_grab_context(adev);
|
|
if (!context)
|
|
return -ENODATA;
|
|
|
|
hotplug_event(type, context);
|
|
acpiphp_let_context_go(context);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
|
|
* @bus: PCI bus to enumerate the slots for.
|
|
*
|
|
* A "slot" is an object associated with a PCI device number. All functions
|
|
* (PCI devices) with the same bus and device number belong to the same slot.
|
|
*/
|
|
void acpiphp_enumerate_slots(struct pci_bus *bus)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
struct acpi_device *adev;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (acpiphp_disabled)
|
|
return;
|
|
|
|
adev = ACPI_COMPANION(bus->bridge);
|
|
if (!adev)
|
|
return;
|
|
|
|
handle = adev->handle;
|
|
bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
|
|
if (!bridge) {
|
|
acpi_handle_err(handle, "No memory for bridge object\n");
|
|
return;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&bridge->slots);
|
|
kref_init(&bridge->ref);
|
|
bridge->pci_dev = pci_dev_get(bus->self);
|
|
bridge->pci_bus = bus;
|
|
|
|
/*
|
|
* Grab a ref to the subordinate PCI bus in case the bus is
|
|
* removed via PCI core logical hotplug. The ref pins the bus
|
|
* (which we access during module unload).
|
|
*/
|
|
get_device(&bus->dev);
|
|
|
|
acpi_lock_hp_context();
|
|
if (pci_is_root_bus(bridge->pci_bus)) {
|
|
struct acpiphp_root_context *root_context;
|
|
|
|
root_context = kzalloc(sizeof(*root_context), GFP_KERNEL);
|
|
if (!root_context)
|
|
goto err;
|
|
|
|
root_context->root_bridge = bridge;
|
|
acpi_set_hp_context(adev, &root_context->hp);
|
|
} else {
|
|
struct acpiphp_context *context;
|
|
|
|
/*
|
|
* This bridge should have been registered as a hotplug function
|
|
* under its parent, so the context should be there, unless the
|
|
* parent is going to be handled by pciehp, in which case this
|
|
* bridge is not interesting to us either.
|
|
*/
|
|
context = acpiphp_get_context(adev);
|
|
if (!context)
|
|
goto err;
|
|
|
|
bridge->context = context;
|
|
context->bridge = bridge;
|
|
/* Get a reference to the parent bridge. */
|
|
get_bridge(context->func.parent);
|
|
}
|
|
acpi_unlock_hp_context();
|
|
|
|
/* Must be added to the list prior to calling acpiphp_add_context(). */
|
|
mutex_lock(&bridge_mutex);
|
|
list_add(&bridge->list, &bridge_list);
|
|
mutex_unlock(&bridge_mutex);
|
|
|
|
/* register all slot objects under this bridge */
|
|
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
|
|
acpiphp_add_context, NULL, bridge, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_handle_err(handle, "failed to register slots\n");
|
|
cleanup_bridge(bridge);
|
|
put_bridge(bridge);
|
|
}
|
|
return;
|
|
|
|
err:
|
|
acpi_unlock_hp_context();
|
|
put_device(&bus->dev);
|
|
pci_dev_put(bridge->pci_dev);
|
|
kfree(bridge);
|
|
}
|
|
|
|
static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge)
|
|
{
|
|
if (pci_is_root_bus(bridge->pci_bus)) {
|
|
struct acpiphp_root_context *root_context;
|
|
struct acpi_device *adev;
|
|
|
|
acpi_lock_hp_context();
|
|
adev = ACPI_COMPANION(bridge->pci_bus->bridge);
|
|
root_context = to_acpiphp_root_context(adev->hp);
|
|
adev->hp = NULL;
|
|
acpi_unlock_hp_context();
|
|
kfree(root_context);
|
|
}
|
|
cleanup_bridge(bridge);
|
|
put_bridge(bridge);
|
|
}
|
|
|
|
/**
|
|
* acpiphp_remove_slots - Remove slot objects associated with a given bus.
|
|
* @bus: PCI bus to remove the slot objects for.
|
|
*/
|
|
void acpiphp_remove_slots(struct pci_bus *bus)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
|
|
if (acpiphp_disabled)
|
|
return;
|
|
|
|
mutex_lock(&bridge_mutex);
|
|
list_for_each_entry(bridge, &bridge_list, list)
|
|
if (bridge->pci_bus == bus) {
|
|
mutex_unlock(&bridge_mutex);
|
|
acpiphp_drop_bridge(bridge);
|
|
return;
|
|
}
|
|
|
|
mutex_unlock(&bridge_mutex);
|
|
}
|
|
|
|
/**
|
|
* acpiphp_enable_slot - power on slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
int acpiphp_enable_slot(struct acpiphp_slot *slot)
|
|
{
|
|
pci_lock_rescan_remove();
|
|
|
|
if (slot->flags & SLOT_IS_GOING_AWAY) {
|
|
pci_unlock_rescan_remove();
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* configure all functions */
|
|
if (!(slot->flags & SLOT_ENABLED))
|
|
enable_slot(slot);
|
|
|
|
pci_unlock_rescan_remove();
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpiphp_disable_and_eject_slot - power off and eject slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
|
|
{
|
|
struct acpiphp_func *func;
|
|
|
|
if (slot->flags & SLOT_IS_GOING_AWAY)
|
|
return -ENODEV;
|
|
|
|
/* unconfigure all functions */
|
|
disable_slot(slot);
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling)
|
|
if (func->flags & FUNC_HAS_EJ0) {
|
|
acpi_handle handle = func_to_handle(func);
|
|
|
|
if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
|
|
acpi_handle_err(handle, "_EJ0 failed\n");
|
|
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int acpiphp_disable_slot(struct acpiphp_slot *slot)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
|
|
* acpiphp_disable_and_eject_slot() will be synchronized properly.
|
|
*/
|
|
acpi_scan_lock_acquire();
|
|
pci_lock_rescan_remove();
|
|
ret = acpiphp_disable_and_eject_slot(slot);
|
|
pci_unlock_rescan_remove();
|
|
acpi_scan_lock_release();
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* slot enabled: 1
|
|
* slot disabled: 0
|
|
*/
|
|
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
|
|
{
|
|
return (slot->flags & SLOT_ENABLED);
|
|
}
|
|
|
|
/*
|
|
* latch open: 1
|
|
* latch closed: 0
|
|
*/
|
|
u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
|
|
{
|
|
return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
|
|
}
|
|
|
|
/*
|
|
* adapter presence : 1
|
|
* absence : 0
|
|
*/
|
|
u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
|
|
{
|
|
return !!get_slot_status(slot);
|
|
}
|