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b50154d53e
Now ARM64 support is being added to ACPI so architecture specific values can not be used in core ACPI code. Following on the patch "ACPI / processor: Check if LAPIC is present during initialization" which uses acpi_lapic in acpi_processor.c, on ARM64 platform, GIC is used instead of local APIC, so acpi_lapic is not a suitable value for ARM64. What is actually important at this point is if there is/are CPU entry/entries (Local APIC/SAPIC, GICC) in MADT, so introduce acpi_has_cpu_in_madt() to be arch specific and generic. Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
501 lines
13 KiB
C
501 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_has_cpu_in_madt()) {
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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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