2
* acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
4
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6
* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
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* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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* - Added processor hotplug support
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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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* 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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* 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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* 1. Make # power states dynamic.
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* 2. Support duty_cycle values that span bit 4.
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* 3. Optimize by having scheduler determine business instead of
31
* having us try to calculate it here.
32
* 4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
35
#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
38
#include <linux/types.h>
39
#include <linux/pci.h>
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#include <linux/cpufreq.h>
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#include <linux/cpu.h>
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#include <linux/dmi.h>
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#include <linux/moduleparam.h>
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#include <linux/cpuidle.h>
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#include <linux/slab.h>
49
#include <asm/system.h>
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#include <asm/delay.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
57
#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/processor.h>
61
#define PREFIX "ACPI: "
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#define ACPI_PROCESSOR_CLASS "processor"
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#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
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#define ACPI_PROCESSOR_FILE_INFO "info"
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#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
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#define ACPI_PROCESSOR_FILE_LIMIT "limit"
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#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
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#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
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#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
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#define ACPI_PROCESSOR_LIMIT_USER 0
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#define ACPI_PROCESSOR_LIMIT_THERMAL 1
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor_driver");
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Processor Driver");
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MODULE_LICENSE("GPL");
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static int acpi_processor_add(struct acpi_device *device);
83
static int acpi_processor_remove(struct acpi_device *device, int type);
84
static void acpi_processor_notify(struct acpi_device *device, u32 event);
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static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
86
static int acpi_processor_handle_eject(struct acpi_processor *pr);
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static const struct acpi_device_id processor_device_ids[] = {
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{ACPI_PROCESSOR_OBJECT_HID, 0},
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MODULE_DEVICE_TABLE(acpi, processor_device_ids);
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static struct acpi_driver acpi_processor_driver = {
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.class = ACPI_PROCESSOR_CLASS,
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.ids = processor_device_ids,
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.add = acpi_processor_add,
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.remove = acpi_processor_remove,
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.suspend = acpi_processor_suspend,
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.resume = acpi_processor_resume,
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.notify = acpi_processor_notify,
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#define INSTALL_NOTIFY_HANDLER 1
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#define UNINSTALL_NOTIFY_HANDLER 2
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DEFINE_PER_CPU(struct acpi_processor *, processors);
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EXPORT_PER_CPU_SYMBOL(processors);
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struct acpi_processor_errata errata __read_mostly;
117
/* --------------------------------------------------------------------------
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-------------------------------------------------------------------------- */
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static int acpi_processor_errata_piix4(struct pci_dev *dev)
131
* Note that 'dev' references the PIIX4 ACPI Controller.
134
switch (dev->revision) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
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switch (dev->revision) {
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case 0: /* PIIX4 A-step */
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case 1: /* PIIX4 B-step */
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* See specification changes #13 ("Manual Throttle Duty Cycle")
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* and #14 ("Enabling and Disabling Manual Throttle"), plus
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* erratum #5 ("STPCLK# Deassertion Time") from the January
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* 2002 PIIX4 specification update. Applies to only older
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errata.piix4.throttle = 1;
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* See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
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* Livelock") from the January 2002 PIIX4 specification update.
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* Applies to all PIIX4 models.
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* Find the PIIX4 IDE Controller and get the Bus Master IDE
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* Status register address. We'll use this later to read
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* each IDE controller's DMA status to make sure we catch all
181
dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82371AB,
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PCI_ANY_ID, PCI_ANY_ID, NULL);
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errata.piix4.bmisx = pci_resource_start(dev, 4);
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* Find the PIIX4 ISA Controller and read the Motherboard
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* DMA controller's status to see if Type-F (Fast) DMA mode
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* is enabled (bit 7) on either channel. Note that we'll
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* disable C3 support if this is enabled, as some legacy
196
* devices won't operate well if fast DMA is disabled.
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dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82371AB_0,
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PCI_ANY_ID, PCI_ANY_ID, NULL);
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pci_read_config_byte(dev, 0x76, &value1);
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pci_read_config_byte(dev, 0x77, &value2);
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if ((value1 & 0x80) || (value2 & 0x80))
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errata.piix4.fdma = 1;
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if (errata.piix4.bmisx)
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Bus master activity detection (BM-IDE) erratum enabled\n"));
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if (errata.piix4.fdma)
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Type-F DMA livelock erratum (C3 disabled)\n"));
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static int acpi_processor_errata(struct acpi_processor *pr)
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struct pci_dev *dev = NULL;
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dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
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result = acpi_processor_errata_piix4(dev);
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/* --------------------------------------------------------------------------
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-------------------------------------------------------------------------- */
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static int acpi_processor_get_info(struct acpi_device *device)
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acpi_status status = 0;
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union acpi_object object = { 0 };
253
struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
254
struct acpi_processor *pr;
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int cpu_index, device_declaration = 0;
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static int cpu0_initialized;
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pr = acpi_driver_data(device);
262
if (num_online_cpus() > 1)
265
acpi_processor_errata(pr);
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* Check to see if we have bus mastering arbitration control. This
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* is required for proper C3 usage (to maintain cache coherency).
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if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
272
pr->flags.bm_control = 1;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Bus mastering arbitration control present\n"));
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"No bus mastering arbitration control\n"));
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if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
280
/* Declared with "Processor" statement; match ProcessorID */
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status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
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if (ACPI_FAILURE(status)) {
283
printk(KERN_ERR PREFIX "Evaluating processor object\n");
288
* TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
289
* >>> 'acpi_get_processor_id(acpi_id, &id)' in
292
pr->acpi_id = object.processor.proc_id;
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* Declared with "Device" statement; match _UID.
296
* Note that we don't handle string _UIDs yet.
298
unsigned long long value;
299
status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
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if (ACPI_FAILURE(status)) {
302
printk(KERN_ERR PREFIX
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"Evaluating processor _UID [%#x]\n", status);
306
device_declaration = 1;
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cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
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/* Handle UP system running SMP kernel, with no LAPIC in MADT */
312
if (!cpu0_initialized && (cpu_index == -1) &&
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(num_online_cpus() == 1)) {
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cpu0_initialized = 1;
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* Extra Processor objects may be enumerated on MP systems with
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* less than the max # of CPUs. They should be ignored _iff
324
* they are physically not present.
328
(acpi_processor_hotadd_init(pr->handle, &pr->id))) {
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* On some boxes several processors use the same processor bus id.
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* But they are located in different scope. For example:
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* Rename the processor device bus id. And the new bus id will be
338
* generated as the following format:
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sprintf(acpi_device_bid(device), "CPU%X", pr->id);
342
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
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if (!object.processor.pblk_address)
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
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else if (object.processor.pblk_length != 6)
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printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
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object.processor.pblk_length);
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pr->throttling.address = object.processor.pblk_address;
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pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
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pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
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pr->pblk = object.processor.pblk_address;
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* We don't care about error returns - we just try to mark
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* these reserved so that nobody else is confused into thinking
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* that this region might be unused..
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* (In particular, allocating the IO range for Cardbus)
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request_region(pr->throttling.address, 6, "ACPI CPU throttle");
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* If ACPI describes a slot number for this CPU, we can use it
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* ensure we get the right value in the "physical id" field
372
status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
373
if (ACPI_SUCCESS(status))
374
arch_fix_phys_package_id(pr->id, object.integer.value);
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static DEFINE_PER_CPU(void *, processor_device_array);
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static void acpi_processor_notify(struct acpi_device *device, u32 event)
383
struct acpi_processor *pr = acpi_driver_data(device);
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case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
391
saved = pr->performance_platform_limit;
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acpi_processor_ppc_has_changed(pr, 1);
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if (saved == pr->performance_platform_limit)
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acpi_bus_generate_proc_event(device, event,
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pr->performance_platform_limit);
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acpi_bus_generate_netlink_event(device->pnp.device_class,
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dev_name(&device->dev), event,
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pr->performance_platform_limit);
401
case ACPI_PROCESSOR_NOTIFY_POWER:
402
acpi_processor_cst_has_changed(pr);
403
acpi_bus_generate_proc_event(device, event, 0);
404
acpi_bus_generate_netlink_event(device->pnp.device_class,
405
dev_name(&device->dev), event, 0);
407
case ACPI_PROCESSOR_NOTIFY_THROTTLING:
408
acpi_processor_tstate_has_changed(pr);
409
acpi_bus_generate_proc_event(device, event, 0);
410
acpi_bus_generate_netlink_event(device->pnp.device_class,
411
dev_name(&device->dev), event, 0);
413
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
414
"Unsupported event [0x%x]\n", event));
421
static int acpi_cpu_soft_notify(struct notifier_block *nfb,
422
unsigned long action, void *hcpu)
424
unsigned int cpu = (unsigned long)hcpu;
425
struct acpi_processor *pr = per_cpu(processors, cpu);
427
if (action == CPU_ONLINE && pr) {
428
acpi_processor_ppc_has_changed(pr, 0);
429
acpi_processor_hotplug(pr);
430
acpi_processor_reevaluate_tstate(pr, action);
431
acpi_processor_tstate_has_changed(pr);
433
if (action == CPU_DEAD && pr) {
434
/* invalidate the flag.throttling after one CPU is offline */
435
acpi_processor_reevaluate_tstate(pr, action);
440
static struct notifier_block acpi_cpu_notifier =
442
.notifier_call = acpi_cpu_soft_notify,
445
static int __cpuinit acpi_processor_add(struct acpi_device *device)
447
struct acpi_processor *pr = NULL;
449
struct sys_device *sysdev;
451
pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
455
if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
460
pr->handle = device->handle;
461
strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
462
strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
463
device->driver_data = pr;
465
result = acpi_processor_get_info(device);
467
/* Processor is physically not present */
472
if (pr->id >= setup_max_cpus && pr->id != 0)
476
BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
480
* ACPI id of processors can be reported wrongly by the BIOS.
481
* Don't trust it blindly
483
if (per_cpu(processor_device_array, pr->id) != NULL &&
484
per_cpu(processor_device_array, pr->id) != device) {
485
printk(KERN_WARNING "BIOS reported wrong ACPI id "
486
"for the processor\n");
488
goto err_free_cpumask;
490
per_cpu(processor_device_array, pr->id) = device;
492
per_cpu(processors, pr->id) = pr;
494
sysdev = get_cpu_sysdev(pr->id);
495
if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
497
goto err_free_cpumask;
500
#ifdef CONFIG_CPU_FREQ
501
acpi_processor_ppc_has_changed(pr, 0);
503
acpi_processor_get_throttling_info(pr);
504
acpi_processor_get_limit_info(pr);
506
if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
507
acpi_processor_power_init(pr, device);
509
pr->cdev = thermal_cooling_device_register("Processor", device,
510
&processor_cooling_ops);
511
if (IS_ERR(pr->cdev)) {
512
result = PTR_ERR(pr->cdev);
516
dev_dbg(&device->dev, "registered as cooling_device%d\n",
519
result = sysfs_create_link(&device->dev.kobj,
520
&pr->cdev->device.kobj,
523
printk(KERN_ERR PREFIX "Create sysfs link\n");
524
goto err_thermal_unregister;
526
result = sysfs_create_link(&pr->cdev->device.kobj,
530
printk(KERN_ERR PREFIX "Create sysfs link\n");
531
goto err_remove_sysfs;
537
sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
538
err_thermal_unregister:
539
thermal_cooling_device_unregister(pr->cdev);
541
acpi_processor_power_exit(pr, device);
543
free_cpumask_var(pr->throttling.shared_cpu_map);
548
static int acpi_processor_remove(struct acpi_device *device, int type)
550
struct acpi_processor *pr = NULL;
553
if (!device || !acpi_driver_data(device))
556
pr = acpi_driver_data(device);
558
if (pr->id >= nr_cpu_ids)
561
if (type == ACPI_BUS_REMOVAL_EJECT) {
562
if (acpi_processor_handle_eject(pr))
566
acpi_processor_power_exit(pr, device);
568
sysfs_remove_link(&device->dev.kobj, "sysdev");
571
sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
572
sysfs_remove_link(&pr->cdev->device.kobj, "device");
573
thermal_cooling_device_unregister(pr->cdev);
577
per_cpu(processors, pr->id) = NULL;
578
per_cpu(processor_device_array, pr->id) = NULL;
581
free_cpumask_var(pr->throttling.shared_cpu_map);
587
#ifdef CONFIG_ACPI_HOTPLUG_CPU
588
/****************************************************************************
589
* Acpi processor hotplug support *
590
****************************************************************************/
592
static int is_processor_present(acpi_handle handle)
595
unsigned long long sta = 0;
598
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
600
if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
604
* _STA is mandatory for a processor that supports hot plug
606
if (status == AE_NOT_FOUND)
607
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
608
"Processor does not support hot plug\n"));
610
ACPI_EXCEPTION((AE_INFO, status,
611
"Processor Device is not present"));
616
int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
619
struct acpi_device *pdev;
622
if (acpi_get_parent(handle, &phandle)) {
626
if (acpi_bus_get_device(phandle, &pdev)) {
630
if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
637
static void acpi_processor_hotplug_notify(acpi_handle handle,
638
u32 event, void *data)
640
struct acpi_processor *pr;
641
struct acpi_device *device = NULL;
646
case ACPI_NOTIFY_BUS_CHECK:
647
case ACPI_NOTIFY_DEVICE_CHECK:
648
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
649
"Processor driver received %s event\n",
650
(event == ACPI_NOTIFY_BUS_CHECK) ?
651
"ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
653
if (!is_processor_present(handle))
656
if (acpi_bus_get_device(handle, &device)) {
657
result = acpi_processor_device_add(handle, &device);
659
printk(KERN_ERR PREFIX
660
"Unable to add the device\n");
664
case ACPI_NOTIFY_EJECT_REQUEST:
665
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
666
"received ACPI_NOTIFY_EJECT_REQUEST\n"));
668
if (acpi_bus_get_device(handle, &device)) {
669
printk(KERN_ERR PREFIX
670
"Device don't exist, dropping EJECT\n");
673
pr = acpi_driver_data(device);
675
printk(KERN_ERR PREFIX
676
"Driver data is NULL, dropping EJECT\n");
681
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
682
"Unsupported event [0x%x]\n", event));
690
processor_walk_namespace_cb(acpi_handle handle,
691
u32 lvl, void *context, void **rv)
694
int *action = context;
695
acpi_object_type type = 0;
697
status = acpi_get_type(handle, &type);
698
if (ACPI_FAILURE(status))
701
if (type != ACPI_TYPE_PROCESSOR)
705
case INSTALL_NOTIFY_HANDLER:
706
acpi_install_notify_handler(handle,
708
acpi_processor_hotplug_notify,
711
case UNINSTALL_NOTIFY_HANDLER:
712
acpi_remove_notify_handler(handle,
714
acpi_processor_hotplug_notify);
723
static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
726
if (!is_processor_present(handle)) {
730
if (acpi_map_lsapic(handle, p_cpu))
733
if (arch_register_cpu(*p_cpu)) {
734
acpi_unmap_lsapic(*p_cpu);
741
static int acpi_processor_handle_eject(struct acpi_processor *pr)
743
if (cpu_online(pr->id))
746
arch_unregister_cpu(pr->id);
747
acpi_unmap_lsapic(pr->id);
751
static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
755
static int acpi_processor_handle_eject(struct acpi_processor *pr)
762
void acpi_processor_install_hotplug_notify(void)
764
#ifdef CONFIG_ACPI_HOTPLUG_CPU
765
int action = INSTALL_NOTIFY_HANDLER;
766
acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
769
processor_walk_namespace_cb, NULL, &action, NULL);
771
register_hotcpu_notifier(&acpi_cpu_notifier);
775
void acpi_processor_uninstall_hotplug_notify(void)
777
#ifdef CONFIG_ACPI_HOTPLUG_CPU
778
int action = UNINSTALL_NOTIFY_HANDLER;
779
acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
782
processor_walk_namespace_cb, NULL, &action, NULL);
784
unregister_hotcpu_notifier(&acpi_cpu_notifier);
788
* We keep the driver loaded even when ACPI is not running.
789
* This is needed for the powernow-k8 driver, that works even without
790
* ACPI, but needs symbols from this driver
793
static int __init acpi_processor_init(void)
800
memset(&errata, 0, sizeof(errata));
802
result = acpi_bus_register_driver(&acpi_processor_driver);
806
acpi_processor_install_hotplug_notify();
808
acpi_thermal_cpufreq_init();
810
acpi_processor_ppc_init();
812
acpi_processor_throttling_init();
817
static void __exit acpi_processor_exit(void)
822
acpi_processor_ppc_exit();
824
acpi_thermal_cpufreq_exit();
826
acpi_processor_uninstall_hotplug_notify();
828
acpi_bus_unregister_driver(&acpi_processor_driver);
830
cpuidle_unregister_driver(&acpi_idle_driver);
835
module_init(acpi_processor_init);
836
module_exit(acpi_processor_exit);
838
MODULE_ALIAS("processor");