![Bjorn Helgaas](/assets/img/avatar_default.png)
We should check the acpi_resource_to_address64() return value, which also removes the need to validate the resource type beforehand. No functional change. Found by Coverity (CID 113815). Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
718 lines
19 KiB
C
718 lines
19 KiB
C
/*
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* pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/pci.h>
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#include <linux/pci-acpi.h>
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#include <linux/pci-aspm.h>
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#include <linux/acpi.h>
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#include <linux/slab.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/apei.h>
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#define PREFIX "ACPI: "
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#define _COMPONENT ACPI_PCI_COMPONENT
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ACPI_MODULE_NAME("pci_root");
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#define ACPI_PCI_ROOT_CLASS "pci_bridge"
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#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
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static int acpi_pci_root_add(struct acpi_device *device,
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const struct acpi_device_id *not_used);
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static void acpi_pci_root_remove(struct acpi_device *device);
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#define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \
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| OSC_ACTIVE_STATE_PWR_SUPPORT \
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| OSC_CLOCK_PWR_CAPABILITY_SUPPORT \
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| OSC_MSI_SUPPORT)
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static const struct acpi_device_id root_device_ids[] = {
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{"PNP0A03", 0},
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{"", 0},
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};
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static struct acpi_scan_handler pci_root_handler = {
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.ids = root_device_ids,
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.attach = acpi_pci_root_add,
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.detach = acpi_pci_root_remove,
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};
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/* Lock to protect both acpi_pci_roots lists */
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static DEFINE_MUTEX(acpi_pci_root_lock);
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static LIST_HEAD(acpi_pci_roots);
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static DEFINE_MUTEX(osc_lock);
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/**
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* acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
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* @handle - the ACPI CA node in question.
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*
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* Note: we could make this API take a struct acpi_device * instead, but
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* for now, it's more convenient to operate on an acpi_handle.
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*/
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int acpi_is_root_bridge(acpi_handle handle)
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{
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int ret;
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struct acpi_device *device;
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ret = acpi_bus_get_device(handle, &device);
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if (ret)
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return 0;
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ret = acpi_match_device_ids(device, root_device_ids);
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if (ret)
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return 0;
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else
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return 1;
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}
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EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
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static acpi_status
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get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
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{
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struct resource *res = data;
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struct acpi_resource_address64 address;
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acpi_status status;
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status = acpi_resource_to_address64(resource, &address);
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if (ACPI_FAILURE(status))
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return AE_OK;
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if ((address.address_length > 0) &&
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(address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
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res->start = address.minimum;
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res->end = address.minimum + address.address_length - 1;
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}
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return AE_OK;
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}
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static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
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struct resource *res)
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{
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acpi_status status;
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res->start = -1;
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status =
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acpi_walk_resources(handle, METHOD_NAME__CRS,
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get_root_bridge_busnr_callback, res);
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if (ACPI_FAILURE(status))
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return status;
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if (res->start == -1)
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return AE_ERROR;
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return AE_OK;
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}
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static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
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static acpi_status acpi_pci_run_osc(acpi_handle handle,
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const u32 *capbuf, u32 *retval)
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{
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struct acpi_osc_context context = {
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.uuid_str = pci_osc_uuid_str,
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.rev = 1,
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.cap.length = 12,
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.cap.pointer = (void *)capbuf,
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};
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acpi_status status;
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status = acpi_run_osc(handle, &context);
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if (ACPI_SUCCESS(status)) {
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*retval = *((u32 *)(context.ret.pointer + 8));
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kfree(context.ret.pointer);
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}
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return status;
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}
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static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
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u32 support,
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u32 *control)
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{
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acpi_status status;
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u32 result, capbuf[3];
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support &= OSC_PCI_SUPPORT_MASKS;
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support |= root->osc_support_set;
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capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
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capbuf[OSC_SUPPORT_TYPE] = support;
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if (control) {
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*control &= OSC_PCI_CONTROL_MASKS;
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capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
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} else {
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/* Run _OSC query only with existing controls. */
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capbuf[OSC_CONTROL_TYPE] = root->osc_control_set;
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}
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status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
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if (ACPI_SUCCESS(status)) {
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root->osc_support_set = support;
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if (control)
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*control = result;
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}
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return status;
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}
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static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
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{
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acpi_status status;
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acpi_handle tmp;
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status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
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if (ACPI_FAILURE(status))
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return status;
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mutex_lock(&osc_lock);
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status = acpi_pci_query_osc(root, flags, NULL);
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mutex_unlock(&osc_lock);
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return status;
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}
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struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
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{
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struct acpi_pci_root *root;
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struct acpi_device *device;
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if (acpi_bus_get_device(handle, &device) ||
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acpi_match_device_ids(device, root_device_ids))
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return NULL;
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root = acpi_driver_data(device);
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return root;
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}
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EXPORT_SYMBOL_GPL(acpi_pci_find_root);
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struct acpi_handle_node {
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struct list_head node;
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acpi_handle handle;
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};
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/**
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* acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
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* @handle: the handle in question
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*
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* Given an ACPI CA handle, the desired PCI device is located in the
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* list of PCI devices.
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*
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* If the device is found, its reference count is increased and this
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* function returns a pointer to its data structure. The caller must
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* decrement the reference count by calling pci_dev_put().
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* If no device is found, %NULL is returned.
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*/
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struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
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{
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int dev, fn;
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unsigned long long adr;
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acpi_status status;
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acpi_handle phandle;
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struct pci_bus *pbus;
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struct pci_dev *pdev = NULL;
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struct acpi_handle_node *node, *tmp;
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struct acpi_pci_root *root;
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LIST_HEAD(device_list);
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/*
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* Walk up the ACPI CA namespace until we reach a PCI root bridge.
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*/
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phandle = handle;
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while (!acpi_is_root_bridge(phandle)) {
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node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
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if (!node)
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goto out;
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INIT_LIST_HEAD(&node->node);
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node->handle = phandle;
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list_add(&node->node, &device_list);
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status = acpi_get_parent(phandle, &phandle);
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if (ACPI_FAILURE(status))
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goto out;
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}
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root = acpi_pci_find_root(phandle);
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if (!root)
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goto out;
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pbus = root->bus;
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/*
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* Now, walk back down the PCI device tree until we return to our
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* original handle. Assumes that everything between the PCI root
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* bridge and the device we're looking for must be a P2P bridge.
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*/
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list_for_each_entry(node, &device_list, node) {
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acpi_handle hnd = node->handle;
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status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
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if (ACPI_FAILURE(status))
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goto out;
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dev = (adr >> 16) & 0xffff;
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fn = adr & 0xffff;
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pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
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if (!pdev || hnd == handle)
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break;
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pbus = pdev->subordinate;
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pci_dev_put(pdev);
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/*
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* This function may be called for a non-PCI device that has a
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* PCI parent (eg. a disk under a PCI SATA controller). In that
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* case pdev->subordinate will be NULL for the parent.
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*/
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if (!pbus) {
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dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
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pdev = NULL;
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break;
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}
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}
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out:
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list_for_each_entry_safe(node, tmp, &device_list, node)
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kfree(node);
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return pdev;
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}
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EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
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/**
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* acpi_pci_osc_control_set - Request control of PCI root _OSC features.
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* @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
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* @mask: Mask of _OSC bits to request control of, place to store control mask.
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* @req: Mask of _OSC bits the control of is essential to the caller.
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*
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* Run _OSC query for @mask and if that is successful, compare the returned
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* mask of control bits with @req. If all of the @req bits are set in the
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* returned mask, run _OSC request for it.
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*
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* The variable at the @mask address may be modified regardless of whether or
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* not the function returns success. On success it will contain the mask of
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* _OSC bits the BIOS has granted control of, but its contents are meaningless
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* on failure.
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**/
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acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
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{
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struct acpi_pci_root *root;
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acpi_status status;
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u32 ctrl, capbuf[3];
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acpi_handle tmp;
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if (!mask)
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return AE_BAD_PARAMETER;
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ctrl = *mask & OSC_PCI_CONTROL_MASKS;
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if ((ctrl & req) != req)
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return AE_TYPE;
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root = acpi_pci_find_root(handle);
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if (!root)
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return AE_NOT_EXIST;
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status = acpi_get_handle(handle, "_OSC", &tmp);
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if (ACPI_FAILURE(status))
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return status;
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mutex_lock(&osc_lock);
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*mask = ctrl | root->osc_control_set;
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/* No need to evaluate _OSC if the control was already granted. */
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if ((root->osc_control_set & ctrl) == ctrl)
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goto out;
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/* Need to check the available controls bits before requesting them. */
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while (*mask) {
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status = acpi_pci_query_osc(root, root->osc_support_set, mask);
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if (ACPI_FAILURE(status))
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goto out;
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if (ctrl == *mask)
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break;
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ctrl = *mask;
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}
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if ((ctrl & req) != req) {
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status = AE_SUPPORT;
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goto out;
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}
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capbuf[OSC_QUERY_TYPE] = 0;
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capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
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capbuf[OSC_CONTROL_TYPE] = ctrl;
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status = acpi_pci_run_osc(handle, capbuf, mask);
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if (ACPI_SUCCESS(status))
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root->osc_control_set = *mask;
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out:
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mutex_unlock(&osc_lock);
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return status;
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}
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EXPORT_SYMBOL(acpi_pci_osc_control_set);
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static int acpi_pci_root_add(struct acpi_device *device,
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const struct acpi_device_id *not_used)
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{
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unsigned long long segment, bus;
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acpi_status status;
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int result;
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struct acpi_pci_root *root;
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u32 flags, base_flags;
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root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
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if (!root)
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return -ENOMEM;
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segment = 0;
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status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
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&segment);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
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printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
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result = -ENODEV;
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goto end;
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}
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/* Check _CRS first, then _BBN. If no _BBN, default to zero. */
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root->secondary.flags = IORESOURCE_BUS;
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status = try_get_root_bridge_busnr(device->handle, &root->secondary);
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if (ACPI_FAILURE(status)) {
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/*
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* We need both the start and end of the downstream bus range
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* to interpret _CBA (MMCONFIG base address), so it really is
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* supposed to be in _CRS. If we don't find it there, all we
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* can do is assume [_BBN-0xFF] or [0-0xFF].
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*/
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root->secondary.end = 0xFF;
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printk(KERN_WARNING FW_BUG PREFIX
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"no secondary bus range in _CRS\n");
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status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,
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NULL, &bus);
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if (ACPI_SUCCESS(status))
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root->secondary.start = bus;
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else if (status == AE_NOT_FOUND)
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root->secondary.start = 0;
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else {
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printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
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result = -ENODEV;
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goto end;
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}
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}
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INIT_LIST_HEAD(&root->node);
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root->device = device;
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root->segment = segment & 0xFFFF;
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strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
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device->driver_data = root;
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printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
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acpi_device_name(device), acpi_device_bid(device),
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root->segment, &root->secondary);
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root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle);
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/*
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* All supported architectures that use ACPI have support for
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* PCI domains, so we indicate this in _OSC support capabilities.
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*/
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flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
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acpi_pci_osc_support(root, flags);
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/*
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* TBD: Need PCI interface for enumeration/configuration of roots.
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*/
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mutex_lock(&acpi_pci_root_lock);
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list_add_tail(&root->node, &acpi_pci_roots);
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mutex_unlock(&acpi_pci_root_lock);
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/*
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* Scan the Root Bridge
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* --------------------
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* Must do this prior to any attempt to bind the root device, as the
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* PCI namespace does not get created until this call is made (and
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* thus the root bridge's pci_dev does not exist).
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*/
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root->bus = pci_acpi_scan_root(root);
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if (!root->bus) {
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printk(KERN_ERR PREFIX
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"Bus %04x:%02x not present in PCI namespace\n",
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root->segment, (unsigned int)root->secondary.start);
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result = -ENODEV;
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goto out_del_root;
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}
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/* Indicate support for various _OSC capabilities. */
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if (pci_ext_cfg_avail())
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flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
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if (pcie_aspm_support_enabled()) {
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flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
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OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
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}
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if (pci_msi_enabled())
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flags |= OSC_MSI_SUPPORT;
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if (flags != base_flags) {
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status = acpi_pci_osc_support(root, flags);
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if (ACPI_FAILURE(status)) {
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dev_info(&device->dev, "ACPI _OSC support "
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"notification failed, disabling PCIe ASPM\n");
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pcie_no_aspm();
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flags = base_flags;
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}
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}
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if (!pcie_ports_disabled
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&& (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
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flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
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| OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
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| OSC_PCI_EXPRESS_PME_CONTROL;
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if (pci_aer_available()) {
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if (aer_acpi_firmware_first())
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dev_dbg(&device->dev,
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"PCIe errors handled by BIOS.\n");
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|
else
|
|
flags |= OSC_PCI_EXPRESS_AER_CONTROL;
|
|
}
|
|
|
|
dev_info(&device->dev,
|
|
"Requesting ACPI _OSC control (0x%02x)\n", flags);
|
|
|
|
status = acpi_pci_osc_control_set(device->handle, &flags,
|
|
OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
|
|
if (ACPI_SUCCESS(status)) {
|
|
dev_info(&device->dev,
|
|
"ACPI _OSC control (0x%02x) granted\n", flags);
|
|
if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
|
|
/*
|
|
* We have ASPM control, but the FADT indicates
|
|
* that it's unsupported. Clear it.
|
|
*/
|
|
pcie_clear_aspm(root->bus);
|
|
}
|
|
} else {
|
|
dev_info(&device->dev,
|
|
"ACPI _OSC request failed (%s), "
|
|
"returned control mask: 0x%02x\n",
|
|
acpi_format_exception(status), flags);
|
|
pr_info("ACPI _OSC control for PCIe not granted, "
|
|
"disabling ASPM\n");
|
|
pcie_no_aspm();
|
|
}
|
|
} else {
|
|
dev_info(&device->dev,
|
|
"Unable to request _OSC control "
|
|
"(_OSC support mask: 0x%02x)\n", flags);
|
|
}
|
|
|
|
pci_acpi_add_bus_pm_notifier(device, root->bus);
|
|
if (device->wakeup.flags.run_wake)
|
|
device_set_run_wake(root->bus->bridge, true);
|
|
|
|
if (system_state != SYSTEM_BOOTING) {
|
|
pcibios_resource_survey_bus(root->bus);
|
|
pci_assign_unassigned_bus_resources(root->bus);
|
|
}
|
|
|
|
/* need to after hot-added ioapic is registered */
|
|
if (system_state != SYSTEM_BOOTING)
|
|
pci_enable_bridges(root->bus);
|
|
|
|
pci_bus_add_devices(root->bus);
|
|
return 1;
|
|
|
|
out_del_root:
|
|
mutex_lock(&acpi_pci_root_lock);
|
|
list_del(&root->node);
|
|
mutex_unlock(&acpi_pci_root_lock);
|
|
|
|
end:
|
|
kfree(root);
|
|
return result;
|
|
}
|
|
|
|
static void acpi_pci_root_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_pci_root *root = acpi_driver_data(device);
|
|
|
|
pci_stop_root_bus(root->bus);
|
|
|
|
device_set_run_wake(root->bus->bridge, false);
|
|
pci_acpi_remove_bus_pm_notifier(device);
|
|
|
|
pci_remove_root_bus(root->bus);
|
|
|
|
mutex_lock(&acpi_pci_root_lock);
|
|
list_del(&root->node);
|
|
mutex_unlock(&acpi_pci_root_lock);
|
|
kfree(root);
|
|
}
|
|
|
|
void __init acpi_pci_root_init(void)
|
|
{
|
|
acpi_hest_init();
|
|
|
|
if (!acpi_pci_disabled) {
|
|
pci_acpi_crs_quirks();
|
|
acpi_scan_add_handler(&pci_root_handler);
|
|
}
|
|
}
|
|
/* Support root bridge hotplug */
|
|
|
|
static void handle_root_bridge_insertion(acpi_handle handle)
|
|
{
|
|
struct acpi_device *device;
|
|
|
|
if (!acpi_bus_get_device(handle, &device)) {
|
|
printk(KERN_DEBUG "acpi device exists...\n");
|
|
return;
|
|
}
|
|
|
|
if (acpi_bus_scan(handle))
|
|
printk(KERN_ERR "cannot add bridge to acpi list\n");
|
|
}
|
|
|
|
static void handle_root_bridge_removal(struct acpi_device *device)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_eject_event *ej_event;
|
|
|
|
ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
|
|
if (!ej_event) {
|
|
/* Inform firmware the hot-remove operation has error */
|
|
(void) acpi_evaluate_hotplug_ost(device->handle,
|
|
ACPI_NOTIFY_EJECT_REQUEST,
|
|
ACPI_OST_SC_NON_SPECIFIC_FAILURE,
|
|
NULL);
|
|
return;
|
|
}
|
|
|
|
ej_event->device = device;
|
|
ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
|
|
|
|
status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
|
|
if (ACPI_FAILURE(status))
|
|
kfree(ej_event);
|
|
}
|
|
|
|
static void _handle_hotplug_event_root(struct work_struct *work)
|
|
{
|
|
struct acpi_pci_root *root;
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER };
|
|
struct acpi_hp_work *hp_work;
|
|
acpi_handle handle;
|
|
u32 type;
|
|
|
|
hp_work = container_of(work, struct acpi_hp_work, work);
|
|
handle = hp_work->handle;
|
|
type = hp_work->type;
|
|
|
|
acpi_scan_lock_acquire();
|
|
|
|
root = acpi_pci_find_root(handle);
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
|
|
switch (type) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
/* bus enumerate */
|
|
printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__,
|
|
(char *)buffer.pointer);
|
|
if (!root)
|
|
handle_root_bridge_insertion(handle);
|
|
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
/* device check */
|
|
printk(KERN_DEBUG "%s: Device check notify on %s\n", __func__,
|
|
(char *)buffer.pointer);
|
|
if (!root)
|
|
handle_root_bridge_insertion(handle);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
/* request device eject */
|
|
printk(KERN_DEBUG "%s: Device eject notify on %s\n", __func__,
|
|
(char *)buffer.pointer);
|
|
if (root)
|
|
handle_root_bridge_removal(root->device);
|
|
break;
|
|
default:
|
|
printk(KERN_WARNING "notify_handler: unknown event type 0x%x for %s\n",
|
|
type, (char *)buffer.pointer);
|
|
break;
|
|
}
|
|
|
|
acpi_scan_lock_release();
|
|
kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
|
|
kfree(buffer.pointer);
|
|
}
|
|
|
|
static void handle_hotplug_event_root(acpi_handle handle, u32 type,
|
|
void *context)
|
|
{
|
|
alloc_acpi_hp_work(handle, type, context,
|
|
_handle_hotplug_event_root);
|
|
}
|
|
|
|
static acpi_status __init
|
|
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
acpi_status status;
|
|
char objname[64];
|
|
struct acpi_buffer buffer = { .length = sizeof(objname),
|
|
.pointer = objname };
|
|
int *count = (int *)context;
|
|
|
|
if (!acpi_is_root_bridge(handle))
|
|
return AE_OK;
|
|
|
|
(*count)++;
|
|
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
|
|
status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_root, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
printk(KERN_DEBUG "acpi root: %s notify handler is not installed, exit status: %u\n",
|
|
objname, (unsigned int)status);
|
|
else
|
|
printk(KERN_DEBUG "acpi root: %s notify handler is installed\n",
|
|
objname);
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
void __init acpi_pci_root_hp_init(void)
|
|
{
|
|
int num = 0;
|
|
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
|
|
|
|
printk(KERN_DEBUG "Found %d acpi root devices\n", num);
|
|
}
|