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1059 lines
26 KiB
1059 lines
26 KiB
// 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 ([email protected]) |
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* Copyright (C) 2002 Hiroshi Aono ([email protected]) |
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* Copyright (C) 2002,2003 NEC Corporation |
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* Copyright (C) 2003-2005 Matthew Wilcox ([email protected]) |
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* Copyright (C) 2003-2005 Hewlett Packard |
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* Copyright (C) 2005 Rajesh Shah ([email protected]) |
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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 <[email protected]> |
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* |
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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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|
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#define pr_fmt(fmt) "acpiphp_glue: " fmt |
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|
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#include <linux/module.h> |
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|
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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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|
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#include "../pci.h" |
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#include "acpiphp.h" |
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|
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static LIST_HEAD(bridge_list); |
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static DEFINE_MUTEX(bridge_mutex); |
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|
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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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/** |
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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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|
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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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|
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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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/** |
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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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|
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if (!adev->hp) |
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return NULL; |
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|
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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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/** |
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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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|
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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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|
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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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|
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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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|
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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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|
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acpi_lock_hp_context(); |
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|
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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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|
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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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|
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get_bridge(context->func.parent); |
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acpiphp_put_context(context); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/** |
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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) 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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|
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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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|
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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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|
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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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|
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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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/** |
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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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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|
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if (!bus) |
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return; |
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|
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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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|
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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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|
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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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/** |
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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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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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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); |
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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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list_for_each_entry(dev, &bus->devices, bus_list) { |
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/* Assume that newly added devices are powered on already. */ |
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if (!pci_dev_is_added(dev)) |
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dev->current_state = PCI_D0; |
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} |
|
|
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pci_bus_add_devices(bus); |
|
|
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slot->flags |= SLOT_ENABLED; |
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list_for_each_entry(func, &slot->funcs, sibling) { |
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dev = pci_get_slot(bus, PCI_DEVFN(slot->device, |
|
func->function)); |
|
if (!dev) { |
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/* Do not set SLOT_ENABLED flag if some funcs |
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are not added. */ |
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slot->flags &= ~SLOT_ENABLED; |
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continue; |
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} |
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pci_dev_put(dev); |
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} |
|
} |
|
|
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/** |
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* disable_slot - disable a slot |
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* @slot: ACPI PHP slot |
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*/ |
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static void disable_slot(struct acpiphp_slot *slot) |
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{ |
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struct pci_bus *bus = slot->bus; |
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struct pci_dev *dev, *prev; |
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struct acpiphp_func *func; |
|
|
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/* |
|
* enable_slot() enumerates all functions in this device via |
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* pci_scan_slot(), whether they have associated ACPI hotplug |
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* methods (_EJ0, etc.) or not. Therefore, we remove all functions |
|
* here. |
|
*/ |
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list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list) |
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if (PCI_SLOT(dev->devfn) == slot->device) |
|
pci_stop_and_remove_bus_device(dev); |
|
|
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list_for_each_entry(func, &slot->funcs, sibling) |
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acpi_bus_trim(func_to_acpi_device(func)); |
|
|
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slot->flags &= ~SLOT_ENABLED; |
|
} |
|
|
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static bool slot_no_hotplug(struct acpiphp_slot *slot) |
|
{ |
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struct pci_bus *bus = slot->bus; |
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struct pci_dev *dev; |
|
|
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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); |
|
}
|
|
|