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WSL2-Linux-Kernel/drivers/acpi/processor_core.c

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C
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/*
* acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
* - Added processor hotplug support
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* TBD:
* 1. Make # power states dynamic.
* 2. Support duty_cycle values that span bit 4.
* 3. Optimize by having scheduler determine business instead of
* having us try to calculate it here.
* 4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/cpufreq.h>
#include <linux/cpu.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/dmi.h>
#include <linux/moduleparam.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/cpu.h>
#include <asm/delay.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <asm/smp.h>
#include <asm/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/processor.h>
#define ACPI_PROCESSOR_COMPONENT 0x01000000
#define ACPI_PROCESSOR_CLASS "processor"
#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
#define ACPI_PROCESSOR_FILE_INFO "info"
#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
#define ACPI_PROCESSOR_FILE_LIMIT "limit"
#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
#define ACPI_PROCESSOR_LIMIT_USER 0
#define ACPI_PROCESSOR_LIMIT_THERMAL 1
#define ACPI_STA_PRESENT 0x00000001
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME ("acpi_processor")
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
MODULE_LICENSE("GPL");
static int acpi_processor_add (struct acpi_device *device);
static int acpi_processor_start (struct acpi_device *device);
static int acpi_processor_remove (struct acpi_device *device, int type);
static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
static void acpi_processor_notify ( acpi_handle handle, u32 event, void *data);
static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
static int acpi_processor_handle_eject(struct acpi_processor *pr);
static struct acpi_driver acpi_processor_driver = {
.name = ACPI_PROCESSOR_DRIVER_NAME,
.class = ACPI_PROCESSOR_CLASS,
.ids = ACPI_PROCESSOR_HID,
.ops = {
.add = acpi_processor_add,
.remove = acpi_processor_remove,
.start = acpi_processor_start,
},
};
#define INSTALL_NOTIFY_HANDLER 1
#define UNINSTALL_NOTIFY_HANDLER 2
static struct file_operations acpi_processor_info_fops = {
.open = acpi_processor_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
struct acpi_processor *processors[NR_CPUS];
struct acpi_processor_errata errata;
/* --------------------------------------------------------------------------
Errata Handling
-------------------------------------------------------------------------- */
static int
acpi_processor_errata_piix4 (
struct pci_dev *dev)
{
u8 rev = 0;
u8 value1 = 0;
u8 value2 = 0;
ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
if (!dev)
return_VALUE(-EINVAL);
/*
* Note that 'dev' references the PIIX4 ACPI Controller.
*/
pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
switch (rev) {
case 0:
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
break;
case 1:
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
break;
case 2:
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
break;
case 3:
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
break;
}
switch (rev) {
case 0: /* PIIX4 A-step */
case 1: /* PIIX4 B-step */
/*
* See specification changes #13 ("Manual Throttle Duty Cycle")
* and #14 ("Enabling and Disabling Manual Throttle"), plus
* erratum #5 ("STPCLK# Deassertion Time") from the January
* 2002 PIIX4 specification update. Applies to only older
* PIIX4 models.
*/
errata.piix4.throttle = 1;
case 2: /* PIIX4E */
case 3: /* PIIX4M */
/*
* See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
* Livelock") from the January 2002 PIIX4 specification update.
* Applies to all PIIX4 models.
*/
/*
* BM-IDE
* ------
* Find the PIIX4 IDE Controller and get the Bus Master IDE
* Status register address. We'll use this later to read
* each IDE controller's DMA status to make sure we catch all
* DMA activity.
*/
dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
PCI_DEVICE_ID_INTEL_82371AB,
PCI_ANY_ID, PCI_ANY_ID, NULL);
if (dev) {
errata.piix4.bmisx = pci_resource_start(dev, 4);
pci_dev_put(dev);
}
/*
* Type-F DMA
* ----------
* Find the PIIX4 ISA Controller and read the Motherboard
* DMA controller's status to see if Type-F (Fast) DMA mode
* is enabled (bit 7) on either channel. Note that we'll
* disable C3 support if this is enabled, as some legacy
* devices won't operate well if fast DMA is disabled.
*/
dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
PCI_DEVICE_ID_INTEL_82371AB_0,
PCI_ANY_ID, PCI_ANY_ID, NULL);
if (dev) {
pci_read_config_byte(dev, 0x76, &value1);
pci_read_config_byte(dev, 0x77, &value2);
if ((value1 & 0x80) || (value2 & 0x80))
errata.piix4.fdma = 1;
pci_dev_put(dev);
}
break;
}
if (errata.piix4.bmisx)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Bus master activity detection (BM-IDE) erratum enabled\n"));
if (errata.piix4.fdma)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Type-F DMA livelock erratum (C3 disabled)\n"));
return_VALUE(0);
}
int
acpi_processor_errata (
struct acpi_processor *pr)
{
int result = 0;
struct pci_dev *dev = NULL;
ACPI_FUNCTION_TRACE("acpi_processor_errata");
if (!pr)
return_VALUE(-EINVAL);
/*
* PIIX4
*/
dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, PCI_ANY_ID, NULL);
if (dev) {
result = acpi_processor_errata_piix4(dev);
pci_dev_put(dev);
}
return_VALUE(result);
}
/* --------------------------------------------------------------------------
Common ACPI processor fucntions
-------------------------------------------------------------------------- */
/*
* _PDC is required for a BIOS-OS handshake for most of the newer
* ACPI processor features.
*/
int acpi_processor_set_pdc(struct acpi_processor *pr,
struct acpi_object_list *pdc_in)
{
acpi_status status = AE_OK;
u32 arg0_buf[3];
union acpi_object arg0 = {ACPI_TYPE_BUFFER};
struct acpi_object_list no_object = {1, &arg0};
struct acpi_object_list *pdc;
ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
arg0.buffer.length = 12;
arg0.buffer.pointer = (u8 *) arg0_buf;
arg0_buf[0] = ACPI_PDC_REVISION_ID;
arg0_buf[1] = 0;
arg0_buf[2] = 0;
pdc = (pdc_in) ? pdc_in : &no_object;
status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
if ((ACPI_FAILURE(status)) && (pdc_in))
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n"));
return_VALUE(status);
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
static struct proc_dir_entry *acpi_processor_dir = NULL;
static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_processor *pr = (struct acpi_processor *)seq->private;
ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
if (!pr)
goto end;
seq_printf(seq, "processor id: %d\n"
"acpi id: %d\n"
"bus mastering control: %s\n"
"power management: %s\n"
"throttling control: %s\n"
"limit interface: %s\n",
pr->id,
pr->acpi_id,
pr->flags.bm_control ? "yes" : "no",
pr->flags.power ? "yes" : "no",
pr->flags.throttling ? "yes" : "no",
pr->flags.limit ? "yes" : "no");
end:
return_VALUE(0);
}
static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_processor_info_seq_show,
PDE(inode)->data);
}
static int
acpi_processor_add_fs (
struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_processor_dir);
if (!acpi_device_dir(device))
return_VALUE(-ENODEV);
}
acpi_device_dir(device)->owner = THIS_MODULE;
/* 'info' [R] */
entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
S_IRUGO, acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
ACPI_PROCESSOR_FILE_INFO));
else {
entry->proc_fops = &acpi_processor_info_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'throttling' [R/W] */
entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
ACPI_PROCESSOR_FILE_THROTTLING));
else {
entry->proc_fops = &acpi_processor_throttling_fops;
entry->proc_fops->write = acpi_processor_write_throttling;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'limit' [R/W] */
entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
ACPI_PROCESSOR_FILE_LIMIT));
else {
entry->proc_fops = &acpi_processor_limit_fops;
entry->proc_fops->write = acpi_processor_write_limit;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return_VALUE(0);
}
static int
acpi_processor_remove_fs (
struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
if (acpi_device_dir(device)) {
remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,acpi_device_dir(device));
remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
acpi_device_dir(device));
remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
acpi_device_dir(device) = NULL;
}
return_VALUE(0);
}
/* Use the acpiid in MADT to map cpus in case of SMP */
#ifndef CONFIG_SMP
#define convert_acpiid_to_cpu(acpi_id) (0xff)
#else
#ifdef CONFIG_IA64
#define arch_acpiid_to_apicid ia64_acpiid_to_sapicid
#define arch_cpu_to_apicid ia64_cpu_to_sapicid
#define ARCH_BAD_APICID (0xffff)
#else
#define arch_acpiid_to_apicid x86_acpiid_to_apicid
#define arch_cpu_to_apicid x86_cpu_to_apicid
#define ARCH_BAD_APICID (0xff)
#endif
static u8 convert_acpiid_to_cpu(u8 acpi_id)
{
u16 apic_id;
int i;
apic_id = arch_acpiid_to_apicid[acpi_id];
if (apic_id == ARCH_BAD_APICID)
return -1;
for (i = 0; i < NR_CPUS; i++) {
if (arch_cpu_to_apicid[i] == apic_id)
return i;
}
return -1;
}
#endif
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static int
acpi_processor_get_info (
struct acpi_processor *pr)
{
acpi_status status = 0;
union acpi_object object = {0};
struct acpi_buffer buffer = {sizeof(union acpi_object), &object};
u8 cpu_index;
static int cpu0_initialized;
ACPI_FUNCTION_TRACE("acpi_processor_get_info");
if (!pr)
return_VALUE(-EINVAL);
if (num_online_cpus() > 1)
errata.smp = TRUE;
acpi_processor_errata(pr);
/*
* Check to see if we have bus mastering arbitration control. This
* is required for proper C3 usage (to maintain cache coherency).
*/
if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
pr->flags.bm_control = 1;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Bus mastering arbitration control present\n"));
}
else
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No bus mastering arbitration control\n"));
/*
* Evalute the processor object. Note that it is common on SMP to
* have the first (boot) processor with a valid PBLK address while
* all others have a NULL address.
*/
status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error evaluating processor object\n"));
return_VALUE(-ENODEV);
}
/*
* TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
* >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
*/
pr->acpi_id = object.processor.proc_id;
cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
/* Handle UP system running SMP kernel, with no LAPIC in MADT */
if ( !cpu0_initialized && (cpu_index == 0xff) &&
(num_online_cpus() == 1)) {
cpu_index = 0;
}
cpu0_initialized = 1;
pr->id = cpu_index;
/*
* Extra Processor objects may be enumerated on MP systems with
* less than the max # of CPUs. They should be ignored _iff
* they are physically not present.
*/
if (cpu_index >= NR_CPUS) {
if (ACPI_FAILURE(acpi_processor_hotadd_init(pr->handle, &pr->id))) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error getting cpuindex for acpiid 0x%x\n",
pr->acpi_id));
return_VALUE(-ENODEV);
}
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
pr->acpi_id));
if (!object.processor.pblk_address)
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
else if (object.processor.pblk_length != 6)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n",
object.processor.pblk_length));
else {
pr->throttling.address = object.processor.pblk_address;
pr->throttling.duty_offset = acpi_fadt.duty_offset;
pr->throttling.duty_width = acpi_fadt.duty_width;
pr->pblk = object.processor.pblk_address;
/*
* We don't care about error returns - we just try to mark
* these reserved so that nobody else is confused into thinking
* that this region might be unused..
*
* (In particular, allocating the IO range for Cardbus)
*/
request_region(pr->throttling.address, 6, "ACPI CPU throttle");
}
#ifdef CONFIG_CPU_FREQ
acpi_processor_ppc_has_changed(pr);
#endif
acpi_processor_get_throttling_info(pr);
acpi_processor_get_limit_info(pr);
return_VALUE(0);
}
static int
acpi_processor_start(
struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_processor *pr;
ACPI_FUNCTION_TRACE("acpi_processor_start");
pr = acpi_driver_data(device);
result = acpi_processor_get_info(pr);
if (result) {
/* Processor is physically not present */
return_VALUE(0);
}
BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
processors[pr->id] = pr;
result = acpi_processor_add_fs(device);
if (result)
goto end;
status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
acpi_processor_notify, pr);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing device notify handler\n"));
}
acpi_processor_power_init(pr, device);
if (pr->flags.throttling) {
printk(KERN_INFO PREFIX "%s [%s] (supports",
acpi_device_name(device), acpi_device_bid(device));
printk(" %d throttling states", pr->throttling.state_count);
printk(")\n");
}
end:
return_VALUE(result);
}
static void
acpi_processor_notify (
acpi_handle handle,
u32 event,
void *data)
{
struct acpi_processor *pr = (struct acpi_processor *) data;
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_processor_notify");
if (!pr)
return_VOID;
if (acpi_bus_get_device(pr->handle, &device))
return_VOID;
switch (event) {
case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
acpi_processor_ppc_has_changed(pr);
acpi_bus_generate_event(device, event,
pr->performance_platform_limit);
break;
case ACPI_PROCESSOR_NOTIFY_POWER:
acpi_processor_cst_has_changed(pr);
acpi_bus_generate_event(device, event, 0);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return_VOID;
}
static int
acpi_processor_add (
struct acpi_device *device)
{
struct acpi_processor *pr = NULL;
ACPI_FUNCTION_TRACE("acpi_processor_add");
if (!device)
return_VALUE(-EINVAL);
pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
if (!pr)
return_VALUE(-ENOMEM);
memset(pr, 0, sizeof(struct acpi_processor));
pr->handle = device->handle;
strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
acpi_driver_data(device) = pr;
return_VALUE(0);
}
static int
acpi_processor_remove (
struct acpi_device *device,
int type)
{
acpi_status status = AE_OK;
struct acpi_processor *pr = NULL;
ACPI_FUNCTION_TRACE("acpi_processor_remove");
if (!device || !acpi_driver_data(device))
return_VALUE(-EINVAL);
pr = (struct acpi_processor *) acpi_driver_data(device);
if (pr->id >= NR_CPUS) {
kfree(pr);
return_VALUE(0);
}
if (type == ACPI_BUS_REMOVAL_EJECT) {
if (acpi_processor_handle_eject(pr))
return_VALUE(-EINVAL);
}
acpi_processor_power_exit(pr, device);
status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
acpi_processor_notify);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error removing notify handler\n"));
}
acpi_processor_remove_fs(device);
processors[pr->id] = NULL;
kfree(pr);
return_VALUE(0);
}
#ifdef CONFIG_ACPI_HOTPLUG_CPU
/****************************************************************************
* Acpi processor hotplug support *
****************************************************************************/
static int is_processor_present(acpi_handle handle);
static int
is_processor_present(
acpi_handle handle)
{
acpi_status status;
unsigned long sta = 0;
ACPI_FUNCTION_TRACE("is_processor_present");
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Processor Device is not present\n"));
return_VALUE(0);
}
return_VALUE(1);
}
static
int acpi_processor_device_add(
acpi_handle handle,
struct acpi_device **device)
{
acpi_handle phandle;
struct acpi_device *pdev;
struct acpi_processor *pr;
ACPI_FUNCTION_TRACE("acpi_processor_device_add");
if (acpi_get_parent(handle, &phandle)) {
return_VALUE(-ENODEV);
}
if (acpi_bus_get_device(phandle, &pdev)) {
return_VALUE(-ENODEV);
}
if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
return_VALUE(-ENODEV);
}
acpi_bus_scan(*device);
pr = acpi_driver_data(*device);
if (!pr)
return_VALUE(-ENODEV);
if ((pr->id >=0) && (pr->id < NR_CPUS)) {
kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE);
}
return_VALUE(0);
}
static void
acpi_processor_hotplug_notify (
acpi_handle handle,
u32 event,
void *data)
{
struct acpi_processor *pr;
struct acpi_device *device = NULL;
int result;
ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
switch (event) {
case ACPI_NOTIFY_BUS_CHECK:
case ACPI_NOTIFY_DEVICE_CHECK:
printk("Processor driver received %s event\n",
(event==ACPI_NOTIFY_BUS_CHECK)?
"ACPI_NOTIFY_BUS_CHECK":"ACPI_NOTIFY_DEVICE_CHECK");
if (!is_processor_present(handle))
break;
if (acpi_bus_get_device(handle, &device)) {
result = acpi_processor_device_add(handle, &device);
if (result)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to add the device\n"));
break;
}
pr = acpi_driver_data(device);
if (!pr) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Driver data is NULL\n"));
break;
}
if (pr->id >= 0 && (pr->id < NR_CPUS)) {
kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
break;
}
result = acpi_processor_start(device);
if ((!result) && ((pr->id >=0) && (pr->id < NR_CPUS))) {
kobject_hotplug(&device->kobj, KOBJ_ONLINE);
} else {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Device [%s] failed to start\n",
acpi_device_bid(device)));
}
break;
case ACPI_NOTIFY_EJECT_REQUEST:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,"received ACPI_NOTIFY_EJECT_REQUEST\n"));
if (acpi_bus_get_device(handle, &device)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Device don't exist, dropping EJECT\n"));
break;
}
pr = acpi_driver_data(device);
if (!pr) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Driver data is NULL, dropping EJECT\n"));
return_VOID;
}
if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return_VOID;
}
static acpi_status
processor_walk_namespace_cb(acpi_handle handle,
u32 lvl,
void *context,
void **rv)
{
acpi_status status;
int *action = context;
acpi_object_type type = 0;
status = acpi_get_type(handle, &type);
if (ACPI_FAILURE(status))
return(AE_OK);
if (type != ACPI_TYPE_PROCESSOR)
return(AE_OK);
switch(*action) {
case INSTALL_NOTIFY_HANDLER:
acpi_install_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
acpi_processor_hotplug_notify,
NULL);
break;
case UNINSTALL_NOTIFY_HANDLER:
acpi_remove_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
acpi_processor_hotplug_notify);
break;
default:
break;
}
return(AE_OK);
}
static acpi_status
acpi_processor_hotadd_init(
acpi_handle handle,
int *p_cpu)
{
ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
if (!is_processor_present(handle)) {
return_VALUE(AE_ERROR);
}
if (acpi_map_lsapic(handle, p_cpu))
return_VALUE(AE_ERROR);
if (arch_register_cpu(*p_cpu)) {
acpi_unmap_lsapic(*p_cpu);
return_VALUE(AE_ERROR);
}
return_VALUE(AE_OK);
}
static int
acpi_processor_handle_eject(struct acpi_processor *pr)
{
if (cpu_online(pr->id)) {
return(-EINVAL);
}
arch_unregister_cpu(pr->id);
acpi_unmap_lsapic(pr->id);
return(0);
}
#else
static acpi_status
acpi_processor_hotadd_init(
acpi_handle handle,
int *p_cpu)
{
return AE_ERROR;
}
static int
acpi_processor_handle_eject(struct acpi_processor *pr)
{
return(-EINVAL);
}
#endif
static
void acpi_processor_install_hotplug_notify(void)
{
#ifdef CONFIG_ACPI_HOTPLUG_CPU
int action = INSTALL_NOTIFY_HANDLER;
acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
processor_walk_namespace_cb,
&action, NULL);
#endif
}
static
void acpi_processor_uninstall_hotplug_notify(void)
{
#ifdef CONFIG_ACPI_HOTPLUG_CPU
int action = UNINSTALL_NOTIFY_HANDLER;
acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
processor_walk_namespace_cb,
&action, NULL);
#endif
}
/*
* We keep the driver loaded even when ACPI is not running.
* This is needed for the powernow-k8 driver, that works even without
* ACPI, but needs symbols from this driver
*/
static int __init
acpi_processor_init (void)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_processor_init");
memset(&processors, 0, sizeof(processors));
memset(&errata, 0, sizeof(errata));
acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
if (!acpi_processor_dir)
return_VALUE(0);
acpi_processor_dir->owner = THIS_MODULE;
result = acpi_bus_register_driver(&acpi_processor_driver);
if (result < 0) {
remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
return_VALUE(0);
}
acpi_processor_install_hotplug_notify();
acpi_thermal_cpufreq_init();
acpi_processor_ppc_init();
return_VALUE(0);
}
static void __exit
acpi_processor_exit (void)
{
ACPI_FUNCTION_TRACE("acpi_processor_exit");
acpi_processor_ppc_exit();
acpi_thermal_cpufreq_exit();
acpi_processor_uninstall_hotplug_notify();
acpi_bus_unregister_driver(&acpi_processor_driver);
remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
return_VOID;
}
module_init(acpi_processor_init);
module_exit(acpi_processor_exit);
EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
MODULE_ALIAS("processor");
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