![Auke Kok](/assets/img/avatar_default.png)
Instead of all drivers reading pci config space to get the revision ID, they can now use the pci_device->revision member. This exposes some issues where drivers where reading a word or a dword for the revision number, and adding useless error-handling around the read. Some drivers even just read it for no purpose of all. In devices where the revision ID is being copied over and used in what appears to be the equivalent of hotpath, I have left the copy code and the cached copy as not to influence the driver's performance. Compile tested with make all{yes,mod}config on x86_64 and i386. Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com> Acked-by: Dave Jones <davej@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1047 lines
26 KiB
C
1047 lines
26 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_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 _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor_core");
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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_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 = "processor",
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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 const 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 __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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Common ACPI processor functions
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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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static int acpi_processor_set_pdc(struct acpi_processor *pr)
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{
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struct acpi_object_list *pdc_in = pr->pdc;
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acpi_status status = AE_OK;
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if (!pdc_in)
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return status;
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status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
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if (ACPI_FAILURE(status))
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Could not evaluate _PDC, using legacy perf. control...\n"));
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return 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 = seq->private;
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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 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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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 -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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return -EIO;
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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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return -EIO;
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else {
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entry->proc_fops = &acpi_processor_throttling_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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/* '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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return -EIO;
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else {
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entry->proc_fops = &acpi_processor_limit_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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return 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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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 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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static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
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#else
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static struct acpi_table_madt *madt;
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static int map_lapic_id(struct acpi_subtable_header *entry,
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u32 acpi_id, int *apic_id)
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{
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struct acpi_madt_local_apic *lapic =
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(struct acpi_madt_local_apic *)entry;
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if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
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lapic->processor_id == acpi_id) {
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*apic_id = lapic->id;
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return 1;
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}
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return 0;
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}
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static int map_lsapic_id(struct acpi_subtable_header *entry,
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u32 acpi_id, int *apic_id)
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{
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struct acpi_madt_local_sapic *lsapic =
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(struct acpi_madt_local_sapic *)entry;
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/* Only check enabled APICs*/
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if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
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/* First check against id */
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if (lsapic->processor_id == acpi_id) {
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*apic_id = (lsapic->id << 8) | lsapic->eid;
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return 1;
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/* Check against optional uid */
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} else if (entry->length >= 16 &&
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lsapic->uid == acpi_id) {
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*apic_id = lsapic->uid;
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return 1;
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}
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}
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return 0;
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}
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#ifdef CONFIG_IA64
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#define arch_cpu_to_apicid ia64_cpu_to_sapicid
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#else
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#define arch_cpu_to_apicid x86_cpu_to_apicid
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#endif
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static int map_madt_entry(u32 acpi_id)
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{
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unsigned long madt_end, entry;
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int apic_id = -1;
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if (!madt)
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return apic_id;
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entry = (unsigned long)madt;
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madt_end = entry + madt->header.length;
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/* Parse all entries looking for a match. */
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entry += sizeof(struct acpi_table_madt);
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while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
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struct acpi_subtable_header *header =
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(struct acpi_subtable_header *)entry;
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if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
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if (map_lapic_id(header, acpi_id, &apic_id))
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break;
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} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
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if (map_lsapic_id(header, acpi_id, &apic_id))
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break;
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}
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entry += header->length;
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}
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return apic_id;
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}
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static int map_mat_entry(acpi_handle handle, u32 acpi_id)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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struct acpi_subtable_header *header;
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int apic_id = -1;
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if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
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goto exit;
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if (!buffer.length || !buffer.pointer)
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goto exit;
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obj = buffer.pointer;
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if (obj->type != ACPI_TYPE_BUFFER ||
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obj->buffer.length < sizeof(struct acpi_subtable_header)) {
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goto exit;
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}
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header = (struct acpi_subtable_header *)obj->buffer.pointer;
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if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
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map_lapic_id(header, acpi_id, &apic_id);
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} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
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map_lsapic_id(header, acpi_id, &apic_id);
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}
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exit:
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if (buffer.pointer)
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kfree(buffer.pointer);
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return apic_id;
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}
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static int get_cpu_id(acpi_handle handle, u32 acpi_id)
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{
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int i;
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int apic_id = -1;
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apic_id = map_mat_entry(handle, acpi_id);
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if (apic_id == -1)
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apic_id = map_madt_entry(acpi_id);
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if (apic_id == -1)
|
|
return apic_id;
|
|
|
|
for (i = 0; i < NR_CPUS; ++i) {
|
|
if (arch_cpu_to_apicid[i] == apic_id)
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Driver Interface
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
|
|
{
|
|
acpi_status status = 0;
|
|
union acpi_object object = { 0 };
|
|
struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
|
|
int cpu_index;
|
|
static int cpu0_initialized;
|
|
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (num_online_cpus() > 1)
|
|
errata.smp = TRUE;
|
|
|
|
acpi_processor_errata(pr);
|
|
|
|
/*
|
|
* Check to see if we have bus mastering arbitration control. This
|
|
* is required for proper C3 usage (to maintain cache coherency).
|
|
*/
|
|
if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
|
|
pr->flags.bm_control = 1;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Bus mastering arbitration control present\n"));
|
|
} else
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"No bus mastering arbitration control\n"));
|
|
|
|
/* Check if it is a Device with HID and UID */
|
|
if (has_uid) {
|
|
unsigned long value;
|
|
status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
|
|
NULL, &value);
|
|
if (ACPI_FAILURE(status)) {
|
|
printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
|
|
return -ENODEV;
|
|
}
|
|
pr->acpi_id = value;
|
|
} else {
|
|
/*
|
|
* Evalute the processor object. Note that it is common on SMP to
|
|
* have the first (boot) processor with a valid PBLK address while
|
|
* all others have a NULL address.
|
|
*/
|
|
status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
printk(KERN_ERR PREFIX "Evaluating processor object\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
|
|
* >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
|
|
*/
|
|
pr->acpi_id = object.processor.proc_id;
|
|
}
|
|
cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
|
|
|
|
/* Handle UP system running SMP kernel, with no LAPIC in MADT */
|
|
if (!cpu0_initialized && (cpu_index == -1) &&
|
|
(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 (pr->id == -1) {
|
|
if (ACPI_FAILURE
|
|
(acpi_processor_hotadd_init(pr->handle, &pr->id))) {
|
|
return -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)
|
|
printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
|
|
object.processor.pblk_length);
|
|
else {
|
|
pr->throttling.address = object.processor.pblk_address;
|
|
pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
|
|
pr->throttling.duty_width = acpi_gbl_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 0;
|
|
}
|
|
|
|
static void *processor_device_array[NR_CPUS];
|
|
|
|
static int __cpuinit acpi_processor_start(struct acpi_device *device)
|
|
{
|
|
int result = 0;
|
|
acpi_status status = AE_OK;
|
|
struct acpi_processor *pr;
|
|
|
|
|
|
pr = acpi_driver_data(device);
|
|
|
|
result = acpi_processor_get_info(pr, device->flags.unique_id);
|
|
if (result) {
|
|
/* Processor is physically not present */
|
|
return 0;
|
|
}
|
|
|
|
BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
|
|
|
|
/*
|
|
* Buggy BIOS check
|
|
* ACPI id of processors can be reported wrongly by the BIOS.
|
|
* Don't trust it blindly
|
|
*/
|
|
if (processor_device_array[pr->id] != NULL &&
|
|
processor_device_array[pr->id] != device) {
|
|
printk(KERN_WARNING "BIOS reported wrong ACPI id"
|
|
"for the processor\n");
|
|
return -ENODEV;
|
|
}
|
|
processor_device_array[pr->id] = device;
|
|
|
|
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);
|
|
|
|
/* _PDC call should be done before doing anything else (if reqd.). */
|
|
arch_acpi_processor_init_pdc(pr);
|
|
acpi_processor_set_pdc(pr);
|
|
|
|
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 result;
|
|
}
|
|
|
|
static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
|
|
{
|
|
struct acpi_processor *pr = data;
|
|
struct acpi_device *device = NULL;
|
|
|
|
|
|
if (!pr)
|
|
return;
|
|
|
|
if (acpi_bus_get_device(pr->handle, &device))
|
|
return;
|
|
|
|
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;
|
|
}
|
|
|
|
static int acpi_processor_add(struct acpi_device *device)
|
|
{
|
|
struct acpi_processor *pr = NULL;
|
|
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
|
|
if (!pr)
|
|
return -ENOMEM;
|
|
|
|
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 0;
|
|
}
|
|
|
|
static int acpi_processor_remove(struct acpi_device *device, int type)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
struct acpi_processor *pr = NULL;
|
|
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return -EINVAL;
|
|
|
|
pr = acpi_driver_data(device);
|
|
|
|
if (pr->id >= NR_CPUS) {
|
|
kfree(pr);
|
|
return 0;
|
|
}
|
|
|
|
if (type == ACPI_BUS_REMOVAL_EJECT) {
|
|
if (acpi_processor_handle_eject(pr))
|
|
return -EINVAL;
|
|
}
|
|
|
|
acpi_processor_power_exit(pr, device);
|
|
|
|
status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
|
|
acpi_processor_notify);
|
|
|
|
acpi_processor_remove_fs(device);
|
|
|
|
processors[pr->id] = NULL;
|
|
|
|
kfree(pr);
|
|
|
|
return 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;
|
|
|
|
|
|
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
|
|
if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
|
|
return 0;
|
|
}
|
|
return 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;
|
|
|
|
|
|
if (acpi_get_parent(handle, &phandle)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (acpi_bus_get_device(phandle, &pdev)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
acpi_bus_start(*device);
|
|
|
|
pr = acpi_driver_data(*device);
|
|
if (!pr)
|
|
return -ENODEV;
|
|
|
|
if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
|
|
kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
|
|
}
|
|
return 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;
|
|
|
|
|
|
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)
|
|
printk(KERN_ERR PREFIX
|
|
"Unable to add the device\n");
|
|
break;
|
|
}
|
|
|
|
pr = acpi_driver_data(device);
|
|
if (!pr) {
|
|
printk(KERN_ERR PREFIX "Driver data is NULL\n");
|
|
break;
|
|
}
|
|
|
|
if (pr->id >= 0 && (pr->id < NR_CPUS)) {
|
|
kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
|
|
break;
|
|
}
|
|
|
|
result = acpi_processor_start(device);
|
|
if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
|
|
kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
|
|
} else {
|
|
printk(KERN_ERR PREFIX "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)) {
|
|
printk(KERN_ERR PREFIX
|
|
"Device don't exist, dropping EJECT\n");
|
|
break;
|
|
}
|
|
pr = acpi_driver_data(device);
|
|
if (!pr) {
|
|
printk(KERN_ERR PREFIX
|
|
"Driver data is NULL, dropping EJECT\n");
|
|
return;
|
|
}
|
|
|
|
if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
|
|
kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
|
|
break;
|
|
default:
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Unsupported event [0x%x]\n", event));
|
|
break;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
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)
|
|
{
|
|
|
|
if (!is_processor_present(handle)) {
|
|
return AE_ERROR;
|
|
}
|
|
|
|
if (acpi_map_lsapic(handle, p_cpu))
|
|
return AE_ERROR;
|
|
|
|
if (arch_register_cpu(*p_cpu)) {
|
|
acpi_unmap_lsapic(*p_cpu);
|
|
return AE_ERROR;
|
|
}
|
|
|
|
return 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;
|
|
|
|
|
|
memset(&processors, 0, sizeof(processors));
|
|
memset(&errata, 0, sizeof(errata));
|
|
|
|
#ifdef CONFIG_SMP
|
|
if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
|
|
(struct acpi_table_header **)&madt)))
|
|
madt = NULL;
|
|
#endif
|
|
|
|
acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
|
|
if (!acpi_processor_dir)
|
|
return -ENOMEM;
|
|
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 result;
|
|
}
|
|
|
|
acpi_processor_install_hotplug_notify();
|
|
|
|
acpi_thermal_cpufreq_init();
|
|
|
|
acpi_processor_ppc_init();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit acpi_processor_exit(void)
|
|
{
|
|
|
|
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;
|
|
}
|
|
|
|
module_init(acpi_processor_init);
|
|
module_exit(acpi_processor_exit);
|
|
|
|
EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
|
|
|
|
MODULE_ALIAS("processor");
|