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![Baoquan He](/assets/img/avatar_default.png)
In acpi_processor_get_info(), ACPI processor info is initialized including ID, namely CPU index. Currently, on a UP system running an SMP kerenl with no LAPIC in the MADT, cpu0_initialized is checked to decide whether or not the CPU has been initialized. However, this check may not be sufficient for kdump kernels. Most of time only 1 CPU is supported because of known problems in kdump kernels. So say the multiple CPUs are present in the boot kernel and a crash happens on one specific CPU, say CPU2. Then it jumps into the kdump kernel with "nr_cpus=1" in the command line. In this situation, the kdump kernel will reuse the ACPI resources from the crashed kernel directly. That means all LAPIC instances are enabled in the MADT while only one CPU is in use. In the kdump kernel, x86_cpu_to_apicid contains the correct APIC ID and it's related to the CPU ID. If cpu0_initialized is checked only, 0 will be used as the CPU index instead of that APIC ID, which is not correct. In addition to checking cpu0_initialized, check acpi_lapic. If acpi_lapic is 0, then no LAPIC is available from the MADT and the system should be treated as a UP one without a LAPIC (that is, assign 0 to the CPU index). Otherwise, use the original (valid) CPU index. Signed-off-by: Baoquan He <bhe@redhat.com> [rjw: Subject and changelog] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
500 lines
13 KiB
C
500 lines
13 KiB
C
/*
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* acpi_processor.c - ACPI processor enumeration support
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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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* Copyright (C) 2013, Intel Corporation
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* Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <acpi/processor.h>
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#include <asm/cpu.h>
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#include "internal.h"
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor");
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DEFINE_PER_CPU(struct acpi_processor *, processors);
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EXPORT_PER_CPU_SYMBOL(processors);
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/* --------------------------------------------------------------------------
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Errata Handling
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-------------------------------------------------------------------------- */
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struct acpi_processor_errata errata __read_mostly;
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EXPORT_SYMBOL_GPL(errata);
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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(void)
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{
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int result = 0;
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struct pci_dev *dev = NULL;
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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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Initialization
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-------------------------------------------------------------------------- */
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#ifdef CONFIG_ACPI_HOTPLUG_CPU
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static int acpi_processor_hotadd_init(struct acpi_processor *pr)
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{
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unsigned long long sta;
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acpi_status status;
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int ret;
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if (pr->apic_id == -1)
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return -ENODEV;
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status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
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if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
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return -ENODEV;
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cpu_maps_update_begin();
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cpu_hotplug_begin();
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ret = acpi_map_lsapic(pr->handle, pr->apic_id, &pr->id);
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if (ret)
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goto out;
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ret = arch_register_cpu(pr->id);
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if (ret) {
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acpi_unmap_lsapic(pr->id);
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goto out;
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}
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/*
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* CPU got hot-added, but cpu_data is not initialized yet. Set a flag
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* to delay cpu_idle/throttling initialization and do it when the CPU
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* gets online for the first time.
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*/
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pr_info("CPU%d has been hot-added\n", pr->id);
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pr->flags.need_hotplug_init = 1;
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out:
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cpu_hotplug_done();
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cpu_maps_update_done();
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return ret;
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}
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#else
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static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_ACPI_HOTPLUG_CPU */
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static int acpi_processor_get_info(struct acpi_device *device)
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{
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union acpi_object object = { 0 };
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struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
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struct acpi_processor *pr = acpi_driver_data(device);
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int apic_id, cpu_index, device_declaration = 0;
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acpi_status status = AE_OK;
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static int cpu0_initialized;
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unsigned long long value;
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acpi_processor_errata();
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/*
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* Check to see if we have bus mastering arbitration control. This
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* is required for proper C3 usage (to maintain cache coherency).
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*/
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if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
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pr->flags.bm_control = 1;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Bus mastering arbitration control present\n"));
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} else
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"No bus mastering arbitration control\n"));
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if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
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/* Declared with "Processor" statement; match ProcessorID */
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status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev,
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"Failed to evaluate processor object (0x%x)\n",
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status);
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return -ENODEV;
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}
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pr->acpi_id = object.processor.proc_id;
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} else {
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/*
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* Declared with "Device" statement; match _UID.
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* Note that we don't handle string _UIDs yet.
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*/
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status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
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NULL, &value);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev,
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"Failed to evaluate processor _UID (0x%x)\n",
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status);
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return -ENODEV;
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}
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device_declaration = 1;
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pr->acpi_id = value;
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}
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apic_id = acpi_get_apicid(pr->handle, device_declaration, pr->acpi_id);
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if (apic_id < 0)
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acpi_handle_debug(pr->handle, "failed to get CPU APIC ID.\n");
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pr->apic_id = apic_id;
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cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
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if (!cpu0_initialized && !acpi_lapic) {
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cpu0_initialized = 1;
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/* Handle UP system running SMP kernel, with no LAPIC in MADT */
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if ((cpu_index == -1) && (num_online_cpus() == 1))
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cpu_index = 0;
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}
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pr->id = cpu_index;
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/*
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* Extra Processor objects may be enumerated on MP systems with
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* less than the max # of CPUs. They should be ignored _iff
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* they are physically not present.
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*/
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if (pr->id == -1) {
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int ret = acpi_processor_hotadd_init(pr);
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if (ret)
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return ret;
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}
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/*
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* On some boxes several processors use the same processor bus id.
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* But they are located in different scope. For example:
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* \_SB.SCK0.CPU0
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* \_SB.SCK1.CPU0
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* Rename the processor device bus id. And the new bus id will be
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* generated as the following format:
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* CPU+CPU ID.
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*/
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sprintf(acpi_device_bid(device), "CPU%X", pr->id);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
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pr->acpi_id));
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if (!object.processor.pblk_address)
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
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else if (object.processor.pblk_length != 6)
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dev_err(&device->dev, "Invalid PBLK length [%d]\n",
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object.processor.pblk_length);
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else {
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pr->throttling.address = object.processor.pblk_address;
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pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
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pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
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pr->pblk = object.processor.pblk_address;
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/*
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* We don't care about error returns - we just try to mark
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* these reserved so that nobody else is confused into thinking
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* that this region might be unused..
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*
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* (In particular, allocating the IO range for Cardbus)
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*/
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request_region(pr->throttling.address, 6, "ACPI CPU throttle");
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}
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/*
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* If ACPI describes a slot number for this CPU, we can use it to
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* ensure we get the right value in the "physical id" field
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* of /proc/cpuinfo
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*/
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status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);
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if (ACPI_SUCCESS(status))
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arch_fix_phys_package_id(pr->id, value);
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return 0;
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}
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/*
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* Do not put anything in here which needs the core to be online.
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* For example MSR access or setting up things which check for cpuinfo_x86
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* (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
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* Such things have to be put in and set up by the processor driver's .probe().
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*/
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static DEFINE_PER_CPU(void *, processor_device_array);
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static int acpi_processor_add(struct acpi_device *device,
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const struct acpi_device_id *id)
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{
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struct acpi_processor *pr;
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struct device *dev;
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int result = 0;
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pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
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if (!pr)
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return -ENOMEM;
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if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
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result = -ENOMEM;
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goto err_free_pr;
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}
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pr->handle = device->handle;
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strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
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device->driver_data = pr;
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result = acpi_processor_get_info(device);
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if (result) /* Processor is not physically present or unavailable */
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return 0;
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#ifdef CONFIG_SMP
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if (pr->id >= setup_max_cpus && pr->id != 0)
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return 0;
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#endif
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BUG_ON(pr->id >= nr_cpu_ids);
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/*
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* Buggy BIOS check.
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* ACPI id of processors can be reported wrongly by the BIOS.
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* Don't trust it blindly
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*/
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if (per_cpu(processor_device_array, pr->id) != NULL &&
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per_cpu(processor_device_array, pr->id) != device) {
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dev_warn(&device->dev,
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"BIOS reported wrong ACPI id %d for the processor\n",
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pr->id);
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/* Give up, but do not abort the namespace scan. */
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goto err;
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}
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/*
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* processor_device_array is not cleared on errors to allow buggy BIOS
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* checks.
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*/
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per_cpu(processor_device_array, pr->id) = device;
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per_cpu(processors, pr->id) = pr;
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dev = get_cpu_device(pr->id);
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if (!dev) {
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result = -ENODEV;
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goto err;
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}
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result = acpi_bind_one(dev, device);
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if (result)
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goto err;
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pr->dev = dev;
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/* Trigger the processor driver's .probe() if present. */
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if (device_attach(dev) >= 0)
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return 1;
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dev_err(dev, "Processor driver could not be attached\n");
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acpi_unbind_one(dev);
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err:
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free_cpumask_var(pr->throttling.shared_cpu_map);
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device->driver_data = NULL;
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per_cpu(processors, pr->id) = NULL;
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err_free_pr:
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kfree(pr);
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return result;
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}
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#ifdef CONFIG_ACPI_HOTPLUG_CPU
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/* --------------------------------------------------------------------------
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Removal
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-------------------------------------------------------------------------- */
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static void acpi_processor_remove(struct acpi_device *device)
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{
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struct acpi_processor *pr;
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if (!device || !acpi_driver_data(device))
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return;
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pr = acpi_driver_data(device);
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if (pr->id >= nr_cpu_ids)
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goto out;
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/*
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* The only reason why we ever get here is CPU hot-removal. The CPU is
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* already offline and the ACPI device removal locking prevents it from
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* being put back online at this point.
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*
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* Unbind the driver from the processor device and detach it from the
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* ACPI companion object.
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*/
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device_release_driver(pr->dev);
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acpi_unbind_one(pr->dev);
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/* Clean up. */
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per_cpu(processor_device_array, pr->id) = NULL;
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per_cpu(processors, pr->id) = NULL;
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cpu_maps_update_begin();
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cpu_hotplug_begin();
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/* Remove the CPU. */
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arch_unregister_cpu(pr->id);
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acpi_unmap_lsapic(pr->id);
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cpu_hotplug_done();
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cpu_maps_update_done();
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try_offline_node(cpu_to_node(pr->id));
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out:
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free_cpumask_var(pr->throttling.shared_cpu_map);
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kfree(pr);
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}
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#endif /* CONFIG_ACPI_HOTPLUG_CPU */
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/*
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* The following ACPI IDs are known to be suitable for representing as
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* processor devices.
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*/
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static const struct acpi_device_id processor_device_ids[] = {
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{ ACPI_PROCESSOR_OBJECT_HID, },
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{ ACPI_PROCESSOR_DEVICE_HID, },
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{ }
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};
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static struct acpi_scan_handler __refdata processor_handler = {
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.ids = processor_device_ids,
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.attach = acpi_processor_add,
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#ifdef CONFIG_ACPI_HOTPLUG_CPU
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.detach = acpi_processor_remove,
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#endif
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.hotplug = {
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.enabled = true,
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},
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};
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void __init acpi_processor_init(void)
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{
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acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
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}
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