![Lan Tianyu](/assets/img/avatar_default.png)
This patch is to use pr_debug/info/warn/err to replace acpiphp debug functions and remove module's debug param. User interface change: before this patch, boot with the "acpiphp.debug" kernel parameter to turn on debug. After this patch, set CONFIG_DYNAMIC_DEBUG=y and boot with "acpiphp.dyndebug=+p" instead. See Documentation/dynamic-debug-howto.txt. [bhelgaas: changelog] Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
1123 lines
28 KiB
C
1123 lines
28 KiB
C
/*
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* ACPI PCI HotPlug glue functions to ACPI CA subsystem
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*
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* Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
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* Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
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* Copyright (C) 2002,2003 NEC Corporation
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* Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
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* Copyright (C) 2003-2005 Hewlett Packard
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* Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
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* Copyright (C) 2005 Intel Corporation
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <kristen.c.accardi@intel.com>
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*
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*/
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/*
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* Lifetime rules for pci_dev:
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* - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
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* when the bridge is scanned and it loses a refcount when the bridge
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* is removed.
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* - When a P2P bridge is present, we elevate the refcount on the subordinate
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* bus. It loses the refcount when the the driver unloads.
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*/
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#define pr_fmt(fmt) "acpiphp_glue: " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/pci-acpi.h>
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#include <linux/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 DEFINE_MUTEX(acpiphp_context_lock);
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static void handle_hotplug_event(acpi_handle handle, u32 type, void *data);
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static void acpiphp_sanitize_bus(struct pci_bus *bus);
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static void acpiphp_set_hpp_values(struct pci_bus *bus);
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static void hotplug_event(acpi_handle handle, u32 type, void *data);
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static void free_bridge(struct kref *kref);
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static void acpiphp_context_handler(acpi_handle handle, void *context)
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{
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/* Intentionally empty. */
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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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* @handle: ACPI object handle to create the context for.
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*
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* Call under acpiphp_context_lock.
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*/
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static struct acpiphp_context *acpiphp_init_context(acpi_handle handle)
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{
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struct acpiphp_context *context;
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acpi_status status;
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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->handle = handle;
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context->refcount = 1;
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status = acpi_attach_data(handle, acpiphp_context_handler, context);
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if (ACPI_FAILURE(status)) {
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kfree(context);
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return NULL;
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}
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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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* @handle: ACPI object handle to get the context for.
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*
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* Call under acpiphp_context_lock.
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*/
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static struct acpiphp_context *acpiphp_get_context(acpi_handle handle)
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{
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struct acpiphp_context *context = NULL;
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acpi_status status;
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void *data;
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status = acpi_get_data(handle, acpiphp_context_handler, &data);
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if (ACPI_SUCCESS(status)) {
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context = data;
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context->refcount++;
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}
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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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* @handle: ACPI object handle to put the context for.
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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 acpiphp_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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acpi_detach_data(context->handle, acpiphp_context_handler);
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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 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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mutex_lock(&acpiphp_context_lock);
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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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mutex_unlock(&acpiphp_context_lock);
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}
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/*
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* the _DCK method can do funny things... and sometimes not
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* hah-hah funny.
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*
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* TBD - figure out a way to only call fixups for
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* systems that require them.
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*/
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static void post_dock_fixups(acpi_handle not_used, u32 event, void *data)
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{
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struct acpiphp_context *context = data;
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struct pci_bus *bus = context->func.slot->bus;
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u32 buses;
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if (!bus->self)
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return;
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/* fixup bad _DCK function that rewrites
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* secondary bridge on slot
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*/
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pci_read_config_dword(bus->self,
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PCI_PRIMARY_BUS,
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&buses);
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if (((buses >> 8) & 0xff) != bus->busn_res.start) {
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buses = (buses & 0xff000000)
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| ((unsigned int)(bus->primary) << 0)
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| ((unsigned int)(bus->busn_res.start) << 8)
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| ((unsigned int)(bus->busn_res.end) << 16);
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pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
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}
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}
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static const struct acpi_dock_ops acpiphp_dock_ops = {
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.fixup = post_dock_fixups,
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.handler = hotplug_event,
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};
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/* Check whether the PCI device is managed by native PCIe hotplug driver */
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static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
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{
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u32 reg32;
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acpi_handle tmp;
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struct acpi_pci_root *root;
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/* Check whether the PCIe port supports native PCIe hotplug */
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if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32))
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return false;
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if (!(reg32 & PCI_EXP_SLTCAP_HPC))
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return false;
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/*
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* Check whether native PCIe hotplug has been enabled for
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* this PCIe hierarchy.
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*/
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tmp = acpi_find_root_bridge_handle(pdev);
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if (!tmp)
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return false;
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root = acpi_pci_find_root(tmp);
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if (!root)
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return false;
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if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
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return false;
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return true;
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}
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static void acpiphp_dock_init(void *data)
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{
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struct acpiphp_context *context = data;
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get_bridge(context->func.parent);
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}
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static void acpiphp_dock_release(void *data)
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{
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struct acpiphp_context *context = data;
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put_bridge(context->func.parent);
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}
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/* callback routine to register each ACPI PCI slot object */
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static acpi_status register_slot(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 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 (pdev && device_is_managed_by_native_pciehp(pdev))
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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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acpi_handle_warn(handle, "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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mutex_lock(&acpiphp_context_lock);
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context = acpiphp_init_context(handle);
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if (!context) {
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mutex_unlock(&acpiphp_context_lock);
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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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mutex_unlock(&acpiphp_context_lock);
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if (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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if (acpi_has_method(handle, "_DCK"))
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newfunc->flags |= FUNC_HAS_DCK;
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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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status = AE_NO_MEMORY;
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goto err;
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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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mutex_init(&slot->crit_sect);
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list_add_tail(&slot->node, &bridge->slots);
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/* Register slots for ejectable funtions only. */
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if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) {
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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 "
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"hotplug driver\n", sun);
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else
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pr_warn("acpiphp_register_hotplug_slot failed "
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"(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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if (is_dock_device(handle)) {
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/* we don't want to call this device's _EJ0
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* because we want the dock notify handler
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* to call it after it calls _DCK
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*/
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newfunc->flags &= ~FUNC_HAS_EJ0;
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if (register_hotplug_dock_device(handle,
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&acpiphp_dock_ops, context,
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acpiphp_dock_init, acpiphp_dock_release))
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pr_debug("failed to register dock device\n");
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}
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/* install notify handler */
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if (!(newfunc->flags & FUNC_HAS_DCK)) {
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status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
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handle_hotplug_event,
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context);
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if (ACPI_FAILURE(status))
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acpi_handle_err(handle,
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"failed to install notify handler\n");
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}
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return AE_OK;
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err:
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mutex_lock(&acpiphp_context_lock);
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acpiphp_put_context(context);
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mutex_unlock(&acpiphp_context_lock);
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return status;
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}
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static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
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{
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struct acpiphp_context *context;
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struct acpiphp_bridge *bridge = NULL;
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mutex_lock(&acpiphp_context_lock);
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context = acpiphp_get_context(handle);
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if (context) {
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bridge = context->bridge;
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if (bridge)
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get_bridge(bridge);
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acpiphp_put_context(context);
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}
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mutex_unlock(&acpiphp_context_lock);
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return bridge;
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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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acpi_status status;
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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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acpi_handle handle = func_to_handle(func);
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if (is_dock_device(handle))
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unregister_hotplug_dock_device(handle);
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if (!(func->flags & FUNC_HAS_DCK)) {
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status = acpi_remove_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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handle_hotplug_event);
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if (ACPI_FAILURE(status))
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pr_err("failed to remove notify handler\n");
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}
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}
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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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}
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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 list_head *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(tmp, &bus->children) {
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n = pci_bus_max_busnr(pci_bus_b(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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* acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree.
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* @handle: ACPI device object handle to start from.
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*/
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static void acpiphp_bus_trim(acpi_handle handle)
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{
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struct acpi_device *adev = NULL;
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acpi_bus_get_device(handle, &adev);
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if (adev)
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acpi_bus_trim(adev);
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}
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/**
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* acpiphp_bus_add - Scan ACPI namespace subtree.
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* @handle: ACPI object handle to start the scan from.
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*/
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static void acpiphp_bus_add(acpi_handle handle)
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{
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struct acpi_device *adev = NULL;
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acpi_bus_scan(handle);
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acpi_bus_get_device(handle, &adev);
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if (adev)
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acpi_device_set_power(adev, ACPI_STATE_D0);
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}
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static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
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{
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struct acpiphp_func *func;
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union acpi_object params[2];
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struct acpi_object_list arg_list;
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list_for_each_entry(func, &slot->funcs, sibling) {
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arg_list.count = 2;
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arg_list.pointer = params;
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params[0].type = ACPI_TYPE_INTEGER;
|
|
params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
|
|
params[1].type = ACPI_TYPE_INTEGER;
|
|
params[1].integer.value = 1;
|
|
/* _REG is optional, we don't care about if there is failure */
|
|
acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
|
|
NULL);
|
|
}
|
|
}
|
|
|
|
static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
|
|
{
|
|
struct acpiphp_func *func;
|
|
|
|
/* quirk, or pcie could set it already */
|
|
if (dev->is_hotplug_bridge)
|
|
return;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (PCI_FUNC(dev->devfn) == func->function) {
|
|
dev->is_hotplug_bridge = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
|
|
{
|
|
struct acpiphp_func *func;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling)
|
|
acpiphp_bus_add(func_to_handle(func));
|
|
|
|
return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
|
|
}
|
|
|
|
/**
|
|
* enable_slot - enable, configure a slot
|
|
* @slot: slot to be enabled
|
|
*
|
|
* This function should be called per *physical slot*,
|
|
* not per each slot object in ACPI namespace.
|
|
*/
|
|
static void __ref enable_slot(struct acpiphp_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
struct pci_bus *bus = slot->bus;
|
|
struct acpiphp_func *func;
|
|
int max, pass;
|
|
LIST_HEAD(add_list);
|
|
int nr_found;
|
|
|
|
nr_found = acpiphp_rescan_slot(slot);
|
|
max = acpiphp_max_busnr(bus);
|
|
for (pass = 0; pass < 2; pass++) {
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (PCI_SLOT(dev->devfn) != slot->device)
|
|
continue;
|
|
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
|
|
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
|
|
max = pci_scan_bridge(bus, dev, max, pass);
|
|
if (pass && dev->subordinate) {
|
|
check_hotplug_bridge(slot, dev);
|
|
pcibios_resource_survey_bus(dev->subordinate);
|
|
__pci_bus_size_bridges(dev->subordinate,
|
|
&add_list);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
__pci_bus_assign_resources(bus, &add_list, NULL);
|
|
/* Nothing more to do here if there are no new devices on this bus. */
|
|
if (!nr_found && (slot->flags & SLOT_ENABLED))
|
|
return;
|
|
|
|
acpiphp_sanitize_bus(bus);
|
|
acpiphp_set_hpp_values(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 (!dev->is_added)
|
|
dev->current_state = PCI_D0;
|
|
}
|
|
|
|
pci_bus_add_devices(bus);
|
|
|
|
slot->flags |= SLOT_ENABLED;
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
|
|
func->function));
|
|
if (!dev) {
|
|
/* Do not set SLOT_ENABLED flag if some funcs
|
|
are not added. */
|
|
slot->flags &= (~SLOT_ENABLED);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* return first device in slot, acquiring a reference on it */
|
|
static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
|
|
{
|
|
struct pci_bus *bus = slot->bus;
|
|
struct pci_dev *dev;
|
|
struct pci_dev *ret = NULL;
|
|
|
|
down_read(&pci_bus_sem);
|
|
list_for_each_entry(dev, &bus->devices, bus_list)
|
|
if (PCI_SLOT(dev->devfn) == slot->device) {
|
|
ret = pci_dev_get(dev);
|
|
break;
|
|
}
|
|
up_read(&pci_bus_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* disable_slot - disable a slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
static void disable_slot(struct acpiphp_slot *slot)
|
|
{
|
|
struct acpiphp_func *func;
|
|
struct pci_dev *pdev;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
while ((pdev = dev_in_slot(slot))) {
|
|
pci_stop_and_remove_bus_device(pdev);
|
|
pci_dev_put(pdev);
|
|
}
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling)
|
|
acpiphp_bus_trim(func_to_handle(func));
|
|
|
|
slot->flags &= (~SLOT_ENABLED);
|
|
}
|
|
|
|
|
|
/**
|
|
* get_slot_status - get ACPI slot status
|
|
* @slot: ACPI PHP slot
|
|
*
|
|
* If a slot has _STA for each function and if any one of them
|
|
* returned non-zero status, return it.
|
|
*
|
|
* If a slot doesn't have _STA and if any one of its functions'
|
|
* configuration space is configured, return 0x0f as a _STA.
|
|
*
|
|
* Otherwise return 0.
|
|
*/
|
|
static unsigned int get_slot_status(struct acpiphp_slot *slot)
|
|
{
|
|
unsigned long long sta = 0;
|
|
struct acpiphp_func *func;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->flags & FUNC_HAS_STA) {
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_integer(func_to_handle(func),
|
|
"_STA", NULL, &sta);
|
|
if (ACPI_SUCCESS(status) && sta)
|
|
break;
|
|
} else {
|
|
u32 dvid;
|
|
|
|
pci_bus_read_config_dword(slot->bus,
|
|
PCI_DEVFN(slot->device,
|
|
func->function),
|
|
PCI_VENDOR_ID, &dvid);
|
|
if (dvid != 0xffffffff) {
|
|
sta = ACPI_STA_ALL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (unsigned int)sta;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
acpi_handle handle = ACPI_HANDLE(&dev->dev);
|
|
struct pci_bus *bus = dev->subordinate;
|
|
bool alive = false;
|
|
|
|
if (handle) {
|
|
acpi_status status;
|
|
unsigned long long sta;
|
|
|
|
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
|
|
alive = ACPI_SUCCESS(status) && sta == ACPI_STA_ALL;
|
|
}
|
|
if (!alive) {
|
|
u32 v;
|
|
|
|
/* Check if the device responds. */
|
|
alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0);
|
|
}
|
|
if (!alive) {
|
|
pci_stop_and_remove_bus_device(dev);
|
|
if (handle)
|
|
acpiphp_bus_trim(handle);
|
|
} 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(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;
|
|
|
|
list_for_each_entry(slot, &bridge->slots, node) {
|
|
struct pci_bus *bus = slot->bus;
|
|
struct pci_dev *dev, *tmp;
|
|
|
|
mutex_lock(&slot->crit_sect);
|
|
/* wake up all functions */
|
|
if (get_slot_status(slot) == ACPI_STA_ALL) {
|
|
/* remove stale devices if any */
|
|
list_for_each_entry_safe(dev, tmp, &bus->devices,
|
|
bus_list)
|
|
if (PCI_SLOT(dev->devfn) == slot->device)
|
|
trim_stale_devices(dev);
|
|
|
|
/* configure all functions */
|
|
enable_slot(slot);
|
|
} else {
|
|
disable_slot(slot);
|
|
}
|
|
mutex_unlock(&slot->crit_sect);
|
|
}
|
|
}
|
|
|
|
static void acpiphp_set_hpp_values(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list)
|
|
pci_configure_slot(dev);
|
|
}
|
|
|
|
/*
|
|
* Remove devices for which we could not assign resources, call
|
|
* arch specific code to fix-up the bus
|
|
*/
|
|
static void acpiphp_sanitize_bus(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev, *tmp;
|
|
int i;
|
|
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
|
|
|
|
list_for_each_entry_safe(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(acpi_handle handle)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
|
|
bridge = acpiphp_handle_to_bridge(handle);
|
|
if (bridge) {
|
|
acpiphp_check_bridge(bridge);
|
|
put_bridge(bridge);
|
|
}
|
|
}
|
|
|
|
static void hotplug_event(acpi_handle handle, u32 type, void *data)
|
|
{
|
|
struct acpiphp_context *context = data;
|
|
struct acpiphp_func *func = &context->func;
|
|
struct acpiphp_bridge *bridge;
|
|
char objname[64];
|
|
struct acpi_buffer buffer = { .length = sizeof(objname),
|
|
.pointer = objname };
|
|
|
|
mutex_lock(&acpiphp_context_lock);
|
|
bridge = context->bridge;
|
|
if (bridge)
|
|
get_bridge(bridge);
|
|
|
|
mutex_unlock(&acpiphp_context_lock);
|
|
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
|
|
switch (type) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
/* bus re-enumerate */
|
|
pr_debug("%s: Bus check notify on %s\n", __func__, objname);
|
|
pr_debug("%s: re-enumerating slots under %s\n",
|
|
__func__, objname);
|
|
if (bridge) {
|
|
acpiphp_check_bridge(bridge);
|
|
} else {
|
|
struct acpiphp_slot *slot = func->slot;
|
|
|
|
mutex_lock(&slot->crit_sect);
|
|
enable_slot(slot);
|
|
mutex_unlock(&slot->crit_sect);
|
|
}
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
/* device check */
|
|
pr_debug("%s: Device check notify on %s\n", __func__, objname);
|
|
if (bridge) {
|
|
acpiphp_check_bridge(bridge);
|
|
} else {
|
|
struct acpiphp_slot *slot = func->slot;
|
|
int ret;
|
|
|
|
/*
|
|
* Check if anything has changed in the slot and rescan
|
|
* from the parent if that's the case.
|
|
*/
|
|
mutex_lock(&slot->crit_sect);
|
|
ret = acpiphp_rescan_slot(slot);
|
|
mutex_unlock(&slot->crit_sect);
|
|
if (ret)
|
|
acpiphp_check_bridge(func->parent);
|
|
}
|
|
break;
|
|
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
/* request device eject */
|
|
pr_debug("%s: Device eject notify on %s\n", __func__, objname);
|
|
acpiphp_disable_and_eject_slot(func->slot);
|
|
break;
|
|
}
|
|
|
|
if (bridge)
|
|
put_bridge(bridge);
|
|
}
|
|
|
|
static void hotplug_event_work(struct work_struct *work)
|
|
{
|
|
struct acpiphp_context *context;
|
|
struct acpi_hp_work *hp_work;
|
|
|
|
hp_work = container_of(work, struct acpi_hp_work, work);
|
|
context = hp_work->context;
|
|
acpi_scan_lock_acquire();
|
|
|
|
hotplug_event(hp_work->handle, hp_work->type, context);
|
|
|
|
acpi_scan_lock_release();
|
|
acpi_evaluate_hotplug_ost(hp_work->handle, hp_work->type,
|
|
ACPI_OST_SC_SUCCESS, NULL);
|
|
kfree(hp_work); /* allocated in handle_hotplug_event() */
|
|
put_bridge(context->func.parent);
|
|
}
|
|
|
|
/**
|
|
* handle_hotplug_event - handle ACPI hotplug event
|
|
* @handle: Notify()'ed acpi_handle
|
|
* @type: Notify code
|
|
* @data: pointer to acpiphp_context structure
|
|
*
|
|
* Handles ACPI event notification on slots.
|
|
*/
|
|
static void handle_hotplug_event(acpi_handle handle, u32 type, void *data)
|
|
{
|
|
struct acpiphp_context *context;
|
|
u32 ost_code = ACPI_OST_SC_SUCCESS;
|
|
|
|
switch (type) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
break;
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS;
|
|
acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_WAKE:
|
|
return;
|
|
|
|
case ACPI_NOTIFY_FREQUENCY_MISMATCH:
|
|
acpi_handle_err(handle, "Device cannot be configured due "
|
|
"to a frequency mismatch\n");
|
|
goto out;
|
|
|
|
case ACPI_NOTIFY_BUS_MODE_MISMATCH:
|
|
acpi_handle_err(handle, "Device cannot be configured due "
|
|
"to a bus mode mismatch\n");
|
|
goto out;
|
|
|
|
case ACPI_NOTIFY_POWER_FAULT:
|
|
acpi_handle_err(handle, "Device has suffered a power fault\n");
|
|
goto out;
|
|
|
|
default:
|
|
acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type);
|
|
ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY;
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&acpiphp_context_lock);
|
|
context = acpiphp_get_context(handle);
|
|
if (context) {
|
|
get_bridge(context->func.parent);
|
|
acpiphp_put_context(context);
|
|
alloc_acpi_hp_work(handle, type, context, hotplug_event_work);
|
|
mutex_unlock(&acpiphp_context_lock);
|
|
return;
|
|
}
|
|
mutex_unlock(&acpiphp_context_lock);
|
|
ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
|
|
|
|
out:
|
|
acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
|
|
}
|
|
|
|
/*
|
|
* Create hotplug slots for the PCI bus.
|
|
* It should always return 0 to avoid skipping following notifiers.
|
|
*/
|
|
void acpiphp_enumerate_slots(struct pci_bus *bus)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (acpiphp_disabled)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(bus->bridge);
|
|
if (!handle)
|
|
return;
|
|
|
|
bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
|
|
if (!bridge) {
|
|
acpi_handle_err(handle, "No memory for bridge object\n");
|
|
return;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&bridge->slots);
|
|
kref_init(&bridge->ref);
|
|
bridge->pci_dev = pci_dev_get(bus->self);
|
|
bridge->pci_bus = bus;
|
|
|
|
/*
|
|
* Grab a ref to the subordinate PCI bus in case the bus is
|
|
* removed via PCI core logical hotplug. The ref pins the bus
|
|
* (which we access during module unload).
|
|
*/
|
|
get_device(&bus->dev);
|
|
|
|
if (!pci_is_root_bus(bridge->pci_bus)) {
|
|
struct acpiphp_context *context;
|
|
|
|
/*
|
|
* This bridge should have been registered as a hotplug function
|
|
* under its parent, so the context has to be there. If not, we
|
|
* are in deep goo.
|
|
*/
|
|
mutex_lock(&acpiphp_context_lock);
|
|
context = acpiphp_get_context(handle);
|
|
if (WARN_ON(!context)) {
|
|
mutex_unlock(&acpiphp_context_lock);
|
|
put_device(&bus->dev);
|
|
kfree(bridge);
|
|
return;
|
|
}
|
|
bridge->context = context;
|
|
context->bridge = bridge;
|
|
/* Get a reference to the parent bridge. */
|
|
get_bridge(context->func.parent);
|
|
mutex_unlock(&acpiphp_context_lock);
|
|
}
|
|
|
|
/* must be added to the list prior to calling register_slot */
|
|
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,
|
|
register_slot, NULL, bridge, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_handle_err(handle, "failed to register slots\n");
|
|
cleanup_bridge(bridge);
|
|
put_bridge(bridge);
|
|
}
|
|
}
|
|
|
|
/* Destroy hotplug slots associated with the PCI bus */
|
|
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);
|
|
cleanup_bridge(bridge);
|
|
put_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)
|
|
{
|
|
mutex_lock(&slot->crit_sect);
|
|
/* configure all functions */
|
|
if (!(slot->flags & SLOT_ENABLED))
|
|
enable_slot(slot);
|
|
|
|
mutex_unlock(&slot->crit_sect);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpiphp_disable_and_eject_slot - power off and eject slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
|
|
{
|
|
struct acpiphp_func *func;
|
|
int retval = 0;
|
|
|
|
mutex_lock(&slot->crit_sect);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
mutex_unlock(&slot->crit_sect);
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*
|
|
* slot enabled: 1
|
|
* slot disabled: 0
|
|
*/
|
|
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
|
|
{
|
|
return (slot->flags & SLOT_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);
|
|
}
|