1061 lines
26 KiB
C
1061 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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 (willy@infradead.org)
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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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* 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 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)
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goto unlock;
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if (context->func.parent->is_going_away) {
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acpiphp_put_context(context);
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context = NULL;
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goto unlock;
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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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unlock:
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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 acpi_device *adev = acpi_fetch_acpi_dev(handle);
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struct acpiphp_bridge *bridge = data;
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struct acpiphp_context *context;
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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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if (!adev)
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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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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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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) or standard PCI hotplug
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* (SHPCHP), because that code is supposed to expose slots to user
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* 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 && hotplug_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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list_for_each_entry(func, &slot->funcs, sibling) {
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/* _REG is optional, we don't care about if there is failure */
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acpi_evaluate_reg(func_to_handle(func),
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ACPI_ADR_SPACE_PCI_CONFIG,
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ACPI_REG_CONNECT);
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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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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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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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static void acpiphp_native_scan_bridge(struct pci_dev *bridge)
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{
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struct pci_bus *bus = bridge->subordinate;
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struct pci_dev *dev;
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int max;
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if (!bus)
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return;
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max = bus->busn_res.start;
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/* Scan already configured non-hotplug bridges */
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for_each_pci_bridge(dev, bus) {
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if (!hotplug_is_native(dev))
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max = pci_scan_bridge(bus, dev, max, 0);
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}
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/* Scan non-hotplug bridges that need to be reconfigured */
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for_each_pci_bridge(dev, bus) {
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if (hotplug_is_native(dev))
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continue;
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max = pci_scan_bridge(bus, dev, max, 1);
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if (dev->subordinate) {
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pcibios_resource_survey_bus(dev->subordinate);
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pci_bus_size_bridges(dev->subordinate);
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pci_bus_assign_resources(dev->subordinate);
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}
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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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* @bridge: true if enable is for the whole bridge (not a single slot)
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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, bool bridge)
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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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if (bridge && bus->self && hotplug_is_native(bus->self)) {
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/*
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* If native hotplug is used, it will take care of hotplug
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* slot management and resource allocation for hotplug
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* bridges. However, ACPI hotplug may still be used for
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* non-hotplug bridges to bring in additional devices such
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* as a Thunderbolt host controller.
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*/
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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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acpiphp_native_scan_bridge(dev);
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}
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} else {
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LIST_HEAD(add_list);
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int max, pass;
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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,
|
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&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);
|
|
}
|
|
|
|
acpiphp_sanitize_bus(bus);
|
|
pcie_bus_configure_settings(bus);
|
|
acpiphp_set_acpi_region(slot);
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
/* Assume that newly added devices are powered on already. */
|
|
if (!pci_dev_is_added(dev))
|
|
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;
|
|
}
|
|
pci_dev_put(dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
u32 dvid;
|
|
|
|
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 {
|
|
if (pci_bus_read_dev_vendor_id(slot->bus,
|
|
PCI_DEVFN(slot->device, func->function),
|
|
&dvid, 0)) {
|
|
sta = ACPI_STA_ALL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!sta) {
|
|
/*
|
|
* Check for the slot itself since it may be that the
|
|
* ACPI slot is a device below PCIe upstream port so in
|
|
* that case it may not even be reachable yet.
|
|
*/
|
|
if (pci_bus_read_dev_vendor_id(slot->bus,
|
|
PCI_DEVFN(slot->device, 0), &dvid, 0)) {
|
|
sta = ACPI_STA_ALL;
|
|
}
|
|
}
|
|
|
|
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_dev_set_disconnected(dev, NULL);
|
|
if (pci_has_subordinate(dev))
|
|
pci_walk_bus(dev->subordinate, pci_dev_set_disconnected,
|
|
NULL);
|
|
|
|
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, true);
|
|
} 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, false);
|
|
|
|
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)
|
|
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, false);
|
|
|
|
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);
|
|
}
|