mirror of
https://github.com/edk2-porting/linux-next.git
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4a35a46bf1
Signed-off-by: Len Brown <len.brown@intel.com>
972 lines
25 KiB
C
972 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/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/dmi.h>
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#include <linux/moduleparam.h>
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#include <asm/io.h>
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#include <asm/system.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 ACPI_PROCESSOR_COMPONENT 0x01000000
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#define ACPI_PROCESSOR_CLASS "processor"
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#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
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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_LIMIT_USER 0
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#define ACPI_PROCESSOR_LIMIT_THERMAL 1
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#define ACPI_STA_PRESENT 0x00000001
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("acpi_processor")
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
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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_start(struct acpi_device *device);
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static int acpi_processor_remove(struct acpi_device *device, int type);
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static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
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static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
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static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
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static int acpi_processor_handle_eject(struct acpi_processor *pr);
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static struct acpi_driver acpi_processor_driver = {
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.name = ACPI_PROCESSOR_DRIVER_NAME,
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.class = ACPI_PROCESSOR_CLASS,
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.ids = ACPI_PROCESSOR_HID,
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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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.start = acpi_processor_start,
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},
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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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static struct file_operations acpi_processor_info_fops = {
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.open = acpi_processor_info_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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struct acpi_processor *processors[NR_CPUS];
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struct acpi_processor_errata errata;
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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 rev = 0;
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u8 value1 = 0;
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u8 value2 = 0;
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ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
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if (!dev)
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return_VALUE(-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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pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
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switch (rev) {
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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 (rev) {
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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_VALUE(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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ACPI_FUNCTION_TRACE("acpi_processor_errata");
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if (!pr)
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return_VALUE(-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_VALUE(result);
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}
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/* --------------------------------------------------------------------------
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Common ACPI processor fucntions
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-------------------------------------------------------------------------- */
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/*
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* _PDC is required for a BIOS-OS handshake for most of the newer
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* ACPI processor features.
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*/
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int acpi_processor_set_pdc(struct acpi_processor *pr,
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struct acpi_object_list *pdc_in)
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{
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acpi_status status = AE_OK;
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u32 arg0_buf[3];
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union acpi_object arg0 = { ACPI_TYPE_BUFFER };
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struct acpi_object_list no_object = { 1, &arg0 };
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struct acpi_object_list *pdc;
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ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
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arg0.buffer.length = 12;
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arg0.buffer.pointer = (u8 *) arg0_buf;
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arg0_buf[0] = ACPI_PDC_REVISION_ID;
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arg0_buf[1] = 0;
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arg0_buf[2] = 0;
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pdc = (pdc_in) ? pdc_in : &no_object;
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status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
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if ((ACPI_FAILURE(status)) && (pdc_in))
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Error evaluating _PDC, using legacy perf. control...\n"));
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return_VALUE(status);
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}
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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static struct proc_dir_entry *acpi_processor_dir = NULL;
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static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
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{
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struct acpi_processor *pr = (struct acpi_processor *)seq->private;
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ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
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if (!pr)
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goto end;
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seq_printf(seq, "processor id: %d\n"
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"acpi id: %d\n"
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"bus mastering control: %s\n"
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"power management: %s\n"
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"throttling control: %s\n"
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"limit interface: %s\n",
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pr->id,
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pr->acpi_id,
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pr->flags.bm_control ? "yes" : "no",
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pr->flags.power ? "yes" : "no",
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pr->flags.throttling ? "yes" : "no",
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pr->flags.limit ? "yes" : "no");
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end:
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return_VALUE(0);
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}
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static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_processor_info_seq_show,
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PDE(inode)->data);
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}
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static int acpi_processor_add_fs(struct acpi_device *device)
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{
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struct proc_dir_entry *entry = NULL;
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ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
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if (!acpi_device_dir(device)) {
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acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
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acpi_processor_dir);
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if (!acpi_device_dir(device))
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return_VALUE(-ENODEV);
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}
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acpi_device_dir(device)->owner = THIS_MODULE;
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/* 'info' [R] */
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entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
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S_IRUGO, acpi_device_dir(device));
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if (!entry)
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Unable to create '%s' fs entry\n",
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ACPI_PROCESSOR_FILE_INFO));
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else {
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entry->proc_fops = &acpi_processor_info_fops;
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entry->data = acpi_driver_data(device);
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entry->owner = THIS_MODULE;
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}
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/* 'throttling' [R/W] */
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entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
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S_IFREG | S_IRUGO | S_IWUSR,
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acpi_device_dir(device));
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if (!entry)
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Unable to create '%s' fs entry\n",
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ACPI_PROCESSOR_FILE_THROTTLING));
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else {
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entry->proc_fops = &acpi_processor_throttling_fops;
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entry->proc_fops->write = acpi_processor_write_throttling;
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entry->data = acpi_driver_data(device);
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entry->owner = THIS_MODULE;
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}
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/* 'limit' [R/W] */
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entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
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S_IFREG | S_IRUGO | S_IWUSR,
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acpi_device_dir(device));
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if (!entry)
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Unable to create '%s' fs entry\n",
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ACPI_PROCESSOR_FILE_LIMIT));
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else {
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entry->proc_fops = &acpi_processor_limit_fops;
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entry->proc_fops->write = acpi_processor_write_limit;
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entry->data = acpi_driver_data(device);
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entry->owner = THIS_MODULE;
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}
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return_VALUE(0);
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}
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static int acpi_processor_remove_fs(struct acpi_device *device)
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{
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ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
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if (acpi_device_dir(device)) {
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remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
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acpi_device_dir(device));
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remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
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acpi_device_dir(device));
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remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
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acpi_device_dir(device));
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remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
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acpi_device_dir(device) = NULL;
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}
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return_VALUE(0);
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}
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/* Use the acpiid in MADT to map cpus in case of SMP */
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#ifndef CONFIG_SMP
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#define convert_acpiid_to_cpu(acpi_id) (0xff)
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#else
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#ifdef CONFIG_IA64
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#define arch_acpiid_to_apicid ia64_acpiid_to_sapicid
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#define arch_cpu_to_apicid ia64_cpu_to_sapicid
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#define ARCH_BAD_APICID (0xffff)
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#else
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#define arch_acpiid_to_apicid x86_acpiid_to_apicid
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#define arch_cpu_to_apicid x86_cpu_to_apicid
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#define ARCH_BAD_APICID (0xff)
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#endif
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static u8 convert_acpiid_to_cpu(u8 acpi_id)
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{
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u16 apic_id;
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int i;
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apic_id = arch_acpiid_to_apicid[acpi_id];
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if (apic_id == ARCH_BAD_APICID)
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return -1;
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for (i = 0; i < NR_CPUS; i++) {
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if (arch_cpu_to_apicid[i] == apic_id)
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return i;
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}
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return -1;
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}
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#endif
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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_processor *pr)
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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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u8 cpu_index;
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static int cpu0_initialized;
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ACPI_FUNCTION_TRACE("acpi_processor_get_info");
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if (!pr)
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return_VALUE(-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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/*
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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_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
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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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/*
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* Evalute the processor object. Note that it is common on SMP to
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* have the first (boot) processor with a valid PBLK address while
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* all others have a NULL address.
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*/
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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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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error evaluating processor object\n"));
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return_VALUE(-ENODEV);
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}
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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 arch/xxx/acpi.c
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*/
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pr->acpi_id = object.processor.proc_id;
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|
|
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_start(*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");
|