![Chen Gang](/assets/img/avatar_default.png)
pr->id is u32 which never < 0, so remove the redundant pr->id < 0 check from acpi_processor_add(). [rjw: Changelog] Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
968 lines
25 KiB
C
968 lines
25 KiB
C
/*
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* acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
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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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* 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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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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* TBD:
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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
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* having us try to calculate it here.
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* 4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
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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/pci.h>
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#include <linux/pm.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>
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#include <linux/acpi.h>
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#include <linux/memory_hotplug.h>
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#include <asm/io.h>
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#include <asm/cpu.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>
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#include <asm/smp.h>
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#include <asm/acpi.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/processor.h>
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#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_DEVICE_HID "ACPI0007"
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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);
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static int acpi_processor_remove(struct acpi_device *device);
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static void acpi_processor_notify(struct acpi_device *device, u32 event);
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static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr);
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static int acpi_processor_handle_eject(struct acpi_processor *pr);
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static int acpi_processor_start(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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{ACPI_PROCESSOR_DEVICE_HID, 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, processor_device_ids);
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static SIMPLE_DEV_PM_OPS(acpi_processor_pm,
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acpi_processor_suspend, acpi_processor_resume);
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static struct acpi_driver acpi_processor_driver = {
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.name = "processor",
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.class = ACPI_PROCESSOR_CLASS,
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.ids = processor_device_ids,
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.ops = {
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.add = acpi_processor_add,
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.remove = acpi_processor_remove,
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.notify = acpi_processor_notify,
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},
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.drv.pm = &acpi_processor_pm,
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};
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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;
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/* --------------------------------------------------------------------------
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Errata Handling
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-------------------------------------------------------------------------- */
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static int acpi_processor_errata_piix4(struct pci_dev *dev)
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{
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u8 value1 = 0;
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u8 value2 = 0;
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if (!dev)
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return -EINVAL;
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/*
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* Note that 'dev' references the PIIX4 ACPI Controller.
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*/
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switch (dev->revision) {
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case 0:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
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break;
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case 1:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
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break;
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case 2:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
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break;
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case 3:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
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break;
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}
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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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/*
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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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* PIIX4 models.
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*/
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errata.piix4.throttle = 1;
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case 2: /* PIIX4E */
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case 3: /* PIIX4M */
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/*
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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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*/
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/*
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* BM-IDE
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* ------
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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
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* DMA activity.
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*/
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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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if (dev) {
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errata.piix4.bmisx = pci_resource_start(dev, 4);
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pci_dev_put(dev);
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}
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/*
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* Type-F DMA
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* ----------
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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
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* devices won't operate well if fast DMA is disabled.
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*/
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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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if (dev) {
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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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pci_dev_put(dev);
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}
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break;
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}
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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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return 0;
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}
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static int acpi_processor_errata(struct acpi_processor *pr)
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{
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int result = 0;
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struct pci_dev *dev = NULL;
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if (!pr)
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return -EINVAL;
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/*
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* PIIX4
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*/
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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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PCI_ANY_ID, NULL);
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if (dev) {
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result = acpi_processor_errata_piix4(dev);
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pci_dev_put(dev);
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}
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return result;
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}
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/* --------------------------------------------------------------------------
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Driver Interface
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-------------------------------------------------------------------------- */
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static int acpi_processor_get_info(struct acpi_device *device)
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{
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acpi_status status = 0;
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union acpi_object object = { 0 };
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struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
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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);
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if (!pr)
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return -EINVAL;
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if (num_online_cpus() > 1)
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errata.smp = TRUE;
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acpi_processor_errata(pr);
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/*
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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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*/
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if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
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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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} else
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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)) {
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/* 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)) {
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dev_err(&device->dev,
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"Failed to evaluate processor object (0x%x)\n",
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status);
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return -ENODEV;
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}
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/*
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* TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
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* >>> 'acpi_get_processor_id(acpi_id, &id)' in
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* arch/xxx/acpi.c
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*/
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pr->acpi_id = object.processor.proc_id;
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} else {
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/*
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* Declared with "Device" statement; match _UID.
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* Note that we don't handle string _UIDs yet.
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*/
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unsigned long long value;
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status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
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NULL, &value);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev,
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"Failed to evaluate processor _UID (0x%x)\n",
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status);
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return -ENODEV;
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}
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device_declaration = 1;
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pr->acpi_id = value;
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}
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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 */
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if (!cpu0_initialized && (cpu_index == -1) &&
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(num_online_cpus() == 1)) {
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cpu_index = 0;
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}
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cpu0_initialized = 1;
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pr->id = cpu_index;
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/*
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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
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* they are physically not present.
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*/
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if (pr->id == -1) {
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if (ACPI_FAILURE(acpi_processor_hotadd_init(pr)))
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return -ENODEV;
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}
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/*
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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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* \_SB.SCK0.CPU0
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* \_SB.SCK1.CPU0
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* Rename the processor device bus id. And the new bus id will be
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* generated as the following format:
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* CPU+CPU ID.
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*/
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sprintf(acpi_device_bid(device), "CPU%X", pr->id);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
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pr->acpi_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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dev_err(&device->dev, "Invalid PBLK length [%d]\n",
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object.processor.pblk_length);
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else {
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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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/*
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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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*
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* (In particular, allocating the IO range for Cardbus)
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*/
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request_region(pr->throttling.address, 6, "ACPI CPU throttle");
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}
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/*
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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
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* of /proc/cpuinfo
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*/
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status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
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if (ACPI_SUCCESS(status))
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arch_fix_phys_package_id(pr->id, object.integer.value);
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return 0;
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}
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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)
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{
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struct acpi_processor *pr = acpi_driver_data(device);
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int saved;
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if (!pr)
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return;
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switch (event) {
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case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
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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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break;
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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);
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break;
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case ACPI_PROCESSOR_NOTIFY_POWER:
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acpi_processor_cst_has_changed(pr);
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acpi_bus_generate_proc_event(device, event, 0);
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acpi_bus_generate_netlink_event(device->pnp.device_class,
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dev_name(&device->dev), event, 0);
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break;
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case ACPI_PROCESSOR_NOTIFY_THROTTLING:
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acpi_processor_tstate_has_changed(pr);
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acpi_bus_generate_proc_event(device, event, 0);
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acpi_bus_generate_netlink_event(device->pnp.device_class,
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dev_name(&device->dev), event, 0);
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Unsupported event [0x%x]\n", event));
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break;
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}
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return;
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}
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static int acpi_cpu_soft_notify(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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struct acpi_processor *pr = per_cpu(processors, cpu);
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if (action == CPU_ONLINE && pr) {
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/* CPU got physically hotplugged and onlined the first time:
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* Initialize missing things
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*/
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if (pr->flags.need_hotplug_init) {
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pr_info("Will online and init hotplugged CPU: %d\n",
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pr->id);
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WARN(acpi_processor_start(pr), "Failed to start CPU:"
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" %d\n", pr->id);
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pr->flags.need_hotplug_init = 0;
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/* Normal CPU soft online event */
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} else {
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acpi_processor_ppc_has_changed(pr, 0);
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acpi_processor_hotplug(pr);
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acpi_processor_reevaluate_tstate(pr, action);
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acpi_processor_tstate_has_changed(pr);
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}
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}
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if (action == CPU_DEAD && pr) {
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/* invalidate the flag.throttling after one CPU is offline */
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acpi_processor_reevaluate_tstate(pr, action);
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}
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return NOTIFY_OK;
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}
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static struct notifier_block acpi_cpu_notifier =
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{
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.notifier_call = acpi_cpu_soft_notify,
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};
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/*
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* acpi_processor_start() is called by the cpu_hotplug_notifier func:
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* acpi_cpu_soft_notify(). Getting it __cpuinit{data} is difficult, the
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* root cause seem to be that acpi_processor_uninstall_hotplug_notify()
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* is in the module_exit (__exit) func. Allowing acpi_processor_start()
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* to not be in __cpuinit section, but being called from __cpuinit funcs
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* via __ref looks like the right thing to do here.
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*/
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static __ref int acpi_processor_start(struct acpi_processor *pr)
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{
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struct acpi_device *device = per_cpu(processor_device_array, pr->id);
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int result = 0;
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#ifdef CONFIG_CPU_FREQ
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acpi_processor_ppc_has_changed(pr, 0);
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acpi_processor_load_module(pr);
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#endif
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acpi_processor_get_throttling_info(pr);
|
|
acpi_processor_get_limit_info(pr);
|
|
|
|
if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
|
|
acpi_processor_power_init(pr);
|
|
|
|
pr->cdev = thermal_cooling_device_register("Processor", device,
|
|
&processor_cooling_ops);
|
|
if (IS_ERR(pr->cdev)) {
|
|
result = PTR_ERR(pr->cdev);
|
|
goto err_power_exit;
|
|
}
|
|
|
|
dev_dbg(&device->dev, "registered as cooling_device%d\n",
|
|
pr->cdev->id);
|
|
|
|
result = sysfs_create_link(&device->dev.kobj,
|
|
&pr->cdev->device.kobj,
|
|
"thermal_cooling");
|
|
if (result) {
|
|
dev_err(&device->dev,
|
|
"Failed to create sysfs link 'thermal_cooling'\n");
|
|
goto err_thermal_unregister;
|
|
}
|
|
result = sysfs_create_link(&pr->cdev->device.kobj,
|
|
&device->dev.kobj,
|
|
"device");
|
|
if (result) {
|
|
dev_err(&pr->cdev->device,
|
|
"Failed to create sysfs link 'device'\n");
|
|
goto err_remove_sysfs_thermal;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_remove_sysfs_thermal:
|
|
sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
|
|
err_thermal_unregister:
|
|
thermal_cooling_device_unregister(pr->cdev);
|
|
err_power_exit:
|
|
acpi_processor_power_exit(pr);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Do not put anything in here which needs the core to be online.
|
|
* For example MSR access or setting up things which check for cpuinfo_x86
|
|
* (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
|
|
* Such things have to be put in and set up above in acpi_processor_start()
|
|
*/
|
|
static int __cpuinit acpi_processor_add(struct acpi_device *device)
|
|
{
|
|
struct acpi_processor *pr = NULL;
|
|
int result = 0;
|
|
struct device *dev;
|
|
|
|
pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
|
|
if (!pr)
|
|
return -ENOMEM;
|
|
|
|
if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
|
|
result = -ENOMEM;
|
|
goto err_free_pr;
|
|
}
|
|
|
|
pr->handle = device->handle;
|
|
strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
|
|
device->driver_data = pr;
|
|
|
|
result = acpi_processor_get_info(device);
|
|
if (result) {
|
|
/* Processor is physically not present */
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
if (pr->id >= setup_max_cpus && pr->id != 0)
|
|
return 0;
|
|
#endif
|
|
|
|
BUG_ON(pr->id >= nr_cpu_ids);
|
|
|
|
/*
|
|
* Buggy BIOS check
|
|
* ACPI id of processors can be reported wrongly by the BIOS.
|
|
* Don't trust it blindly
|
|
*/
|
|
if (per_cpu(processor_device_array, pr->id) != NULL &&
|
|
per_cpu(processor_device_array, pr->id) != device) {
|
|
dev_warn(&device->dev,
|
|
"BIOS reported wrong ACPI id %d for the processor\n",
|
|
pr->id);
|
|
result = -ENODEV;
|
|
goto err_free_cpumask;
|
|
}
|
|
per_cpu(processor_device_array, pr->id) = device;
|
|
|
|
per_cpu(processors, pr->id) = pr;
|
|
|
|
dev = get_cpu_device(pr->id);
|
|
if (sysfs_create_link(&device->dev.kobj, &dev->kobj, "sysdev")) {
|
|
result = -EFAULT;
|
|
goto err_clear_processor;
|
|
}
|
|
|
|
/*
|
|
* Do not start hotplugged CPUs now, but when they
|
|
* are onlined the first time
|
|
*/
|
|
if (pr->flags.need_hotplug_init)
|
|
return 0;
|
|
|
|
result = acpi_processor_start(pr);
|
|
if (result)
|
|
goto err_remove_sysfs;
|
|
|
|
return 0;
|
|
|
|
err_remove_sysfs:
|
|
sysfs_remove_link(&device->dev.kobj, "sysdev");
|
|
err_clear_processor:
|
|
/*
|
|
* processor_device_array is not cleared to allow checks for buggy BIOS
|
|
*/
|
|
per_cpu(processors, pr->id) = NULL;
|
|
err_free_cpumask:
|
|
free_cpumask_var(pr->throttling.shared_cpu_map);
|
|
err_free_pr:
|
|
kfree(pr);
|
|
return result;
|
|
}
|
|
|
|
static int acpi_processor_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_processor *pr = NULL;
|
|
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return -EINVAL;
|
|
|
|
pr = acpi_driver_data(device);
|
|
|
|
if (pr->id >= nr_cpu_ids)
|
|
goto free;
|
|
|
|
if (device->removal_type == ACPI_BUS_REMOVAL_EJECT) {
|
|
if (acpi_processor_handle_eject(pr))
|
|
return -EINVAL;
|
|
}
|
|
|
|
acpi_processor_power_exit(pr);
|
|
|
|
sysfs_remove_link(&device->dev.kobj, "sysdev");
|
|
|
|
if (pr->cdev) {
|
|
sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
|
|
sysfs_remove_link(&pr->cdev->device.kobj, "device");
|
|
thermal_cooling_device_unregister(pr->cdev);
|
|
pr->cdev = NULL;
|
|
}
|
|
|
|
per_cpu(processors, pr->id) = NULL;
|
|
per_cpu(processor_device_array, pr->id) = NULL;
|
|
try_offline_node(cpu_to_node(pr->id));
|
|
|
|
free:
|
|
free_cpumask_var(pr->throttling.shared_cpu_map);
|
|
kfree(pr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI_HOTPLUG_CPU
|
|
/****************************************************************************
|
|
* Acpi processor hotplug support *
|
|
****************************************************************************/
|
|
|
|
static int is_processor_present(acpi_handle handle)
|
|
{
|
|
acpi_status status;
|
|
unsigned long long sta = 0;
|
|
|
|
|
|
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
|
|
|
|
if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
|
|
return 1;
|
|
|
|
/*
|
|
* _STA is mandatory for a processor that supports hot plug
|
|
*/
|
|
if (status == AE_NOT_FOUND)
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Processor does not support hot plug\n"));
|
|
else
|
|
ACPI_EXCEPTION((AE_INFO, status,
|
|
"Processor Device is not present"));
|
|
return 0;
|
|
}
|
|
|
|
static void acpi_processor_hotplug_notify(acpi_handle handle,
|
|
u32 event, void *data)
|
|
{
|
|
struct acpi_device *device = NULL;
|
|
struct acpi_eject_event *ej_event = NULL;
|
|
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
|
|
acpi_status status;
|
|
int result;
|
|
|
|
acpi_scan_lock_acquire();
|
|
|
|
switch (event) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"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))
|
|
break;
|
|
|
|
result = acpi_bus_scan(handle);
|
|
if (result) {
|
|
acpi_handle_err(handle, "Unable to add the device\n");
|
|
break;
|
|
}
|
|
result = acpi_bus_get_device(handle, &device);
|
|
if (result) {
|
|
acpi_handle_err(handle, "Missing device object\n");
|
|
break;
|
|
}
|
|
ost_code = ACPI_OST_SC_SUCCESS;
|
|
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_handle_err(handle,
|
|
"Device don't exist, dropping EJECT\n");
|
|
break;
|
|
}
|
|
if (!acpi_driver_data(device)) {
|
|
acpi_handle_err(handle,
|
|
"Driver data is NULL, dropping EJECT\n");
|
|
break;
|
|
}
|
|
|
|
ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
|
|
if (!ej_event) {
|
|
acpi_handle_err(handle, "No memory, dropping EJECT\n");
|
|
break;
|
|
}
|
|
|
|
get_device(&device->dev);
|
|
ej_event->device = device;
|
|
ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
|
|
/* The eject is carried out asynchronously. */
|
|
status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
|
|
ej_event);
|
|
if (ACPI_FAILURE(status)) {
|
|
put_device(&device->dev);
|
|
kfree(ej_event);
|
|
break;
|
|
}
|
|
goto out;
|
|
|
|
default:
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Unsupported event [0x%x]\n", event));
|
|
|
|
/* non-hotplug event; possibly handled by other handler */
|
|
goto out;
|
|
}
|
|
|
|
/* Inform firmware that the hotplug operation has completed */
|
|
(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
|
|
|
|
out:
|
|
acpi_scan_lock_release();
|
|
}
|
|
|
|
static acpi_status is_processor_device(acpi_handle handle)
|
|
{
|
|
struct acpi_device_info *info;
|
|
char *hid;
|
|
acpi_status status;
|
|
|
|
status = acpi_get_object_info(handle, &info);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
if (info->type == ACPI_TYPE_PROCESSOR) {
|
|
kfree(info);
|
|
return AE_OK; /* found a processor object */
|
|
}
|
|
|
|
if (!(info->valid & ACPI_VALID_HID)) {
|
|
kfree(info);
|
|
return AE_ERROR;
|
|
}
|
|
|
|
hid = info->hardware_id.string;
|
|
if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
|
|
kfree(info);
|
|
return AE_ERROR;
|
|
}
|
|
|
|
kfree(info);
|
|
return AE_OK; /* found a processor device object */
|
|
}
|
|
|
|
static acpi_status
|
|
processor_walk_namespace_cb(acpi_handle handle,
|
|
u32 lvl, void *context, void **rv)
|
|
{
|
|
acpi_status status;
|
|
int *action = context;
|
|
|
|
status = is_processor_device(handle);
|
|
if (ACPI_FAILURE(status))
|
|
return AE_OK; /* not a processor; continue to walk */
|
|
|
|
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;
|
|
}
|
|
|
|
/* found a processor; skip walking underneath */
|
|
return AE_CTRL_DEPTH;
|
|
}
|
|
|
|
static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
|
|
{
|
|
acpi_handle handle = pr->handle;
|
|
|
|
if (!is_processor_present(handle)) {
|
|
return AE_ERROR;
|
|
}
|
|
|
|
if (acpi_map_lsapic(handle, &pr->id))
|
|
return AE_ERROR;
|
|
|
|
if (arch_register_cpu(pr->id)) {
|
|
acpi_unmap_lsapic(pr->id);
|
|
return AE_ERROR;
|
|
}
|
|
|
|
/* CPU got hot-plugged, but cpu_data is not initialized yet
|
|
* Set flag to delay cpu_idle/throttling initialization
|
|
* in:
|
|
* acpi_processor_add()
|
|
* acpi_processor_get_info()
|
|
* and do it when the CPU gets online the first time
|
|
* TBD: Cleanup above functions and try to do this more elegant.
|
|
*/
|
|
pr_info("CPU %d got hotplugged\n", pr->id);
|
|
pr->flags.need_hotplug_init = 1;
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static int acpi_processor_handle_eject(struct acpi_processor *pr)
|
|
{
|
|
if (cpu_online(pr->id))
|
|
cpu_down(pr->id);
|
|
|
|
get_online_cpus();
|
|
/*
|
|
* The cpu might become online again at this point. So we check whether
|
|
* the cpu has been onlined or not. If the cpu became online, it means
|
|
* that someone wants to use the cpu. So acpi_processor_handle_eject()
|
|
* returns -EAGAIN.
|
|
*/
|
|
if (unlikely(cpu_online(pr->id))) {
|
|
put_online_cpus();
|
|
pr_warn("Failed to remove CPU %d, because other task "
|
|
"brought the CPU back online\n", pr->id);
|
|
return -EAGAIN;
|
|
}
|
|
arch_unregister_cpu(pr->id);
|
|
acpi_unmap_lsapic(pr->id);
|
|
put_online_cpus();
|
|
return (0);
|
|
}
|
|
#else
|
|
static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
|
|
{
|
|
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_ANY,
|
|
ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
processor_walk_namespace_cb, NULL, &action, NULL);
|
|
#endif
|
|
register_hotcpu_notifier(&acpi_cpu_notifier);
|
|
}
|
|
|
|
static
|
|
void acpi_processor_uninstall_hotplug_notify(void)
|
|
{
|
|
#ifdef CONFIG_ACPI_HOTPLUG_CPU
|
|
int action = UNINSTALL_NOTIFY_HANDLER;
|
|
acpi_walk_namespace(ACPI_TYPE_ANY,
|
|
ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
processor_walk_namespace_cb, NULL, &action, NULL);
|
|
#endif
|
|
unregister_hotcpu_notifier(&acpi_cpu_notifier);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
result = acpi_bus_register_driver(&acpi_processor_driver);
|
|
if (result < 0)
|
|
return result;
|
|
|
|
acpi_processor_install_hotplug_notify();
|
|
|
|
acpi_thermal_cpufreq_init();
|
|
|
|
acpi_processor_ppc_init();
|
|
|
|
acpi_processor_throttling_init();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit acpi_processor_exit(void)
|
|
{
|
|
if (acpi_disabled)
|
|
return;
|
|
|
|
acpi_processor_ppc_exit();
|
|
|
|
acpi_thermal_cpufreq_exit();
|
|
|
|
acpi_processor_uninstall_hotplug_notify();
|
|
|
|
acpi_bus_unregister_driver(&acpi_processor_driver);
|
|
|
|
return;
|
|
}
|
|
|
|
module_init(acpi_processor_init);
|
|
module_exit(acpi_processor_exit);
|
|
|
|
MODULE_ALIAS("processor");
|