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![Sebastian Andrzej Siewior](/assets/img/avatar_default.png)
The functions cpu_hotplug_begin, cpu_hotplug_done, get_online_cpus() and put_online_cpus() have been deprecated during the CPU hotplug rework. They map directly to cpus_write_lock(), cpus_write_unlock, cpus_read_lock() and cpus_read_unlock(). Replace deprecated CPU-hotplug functions with the official version. The behavior remains unchanged. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
893 lines
23 KiB
C
893 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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_PER_CPU(struct acpi_processor *, processors);
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EXPORT_PER_CPU_SYMBOL(processors);
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/* Errata Handling */
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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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dev_dbg(&dev->dev, "Found PIIX4 A-step\n");
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break;
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case 1:
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dev_dbg(&dev->dev, "Found PIIX4 B-step\n");
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break;
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case 2:
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dev_dbg(&dev->dev, "Found PIIX4E\n");
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break;
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case 3:
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dev_dbg(&dev->dev, "Found PIIX4M\n");
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break;
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default:
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dev_dbg(&dev->dev, "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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fallthrough;
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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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dev_dbg(&dev->dev, "Bus master activity detection (BM-IDE) erratum enabled\n");
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if (errata.piix4.fdma)
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dev_dbg(&dev->dev, "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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/* Initialization */
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#ifdef CONFIG_ACPI_HOTPLUG_CPU
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int __weak acpi_map_cpu(acpi_handle handle,
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phys_cpuid_t physid, u32 acpi_id, int *pcpu)
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{
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return -ENODEV;
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}
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int __weak acpi_unmap_cpu(int cpu)
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{
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return -ENODEV;
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}
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int __weak arch_register_cpu(int cpu)
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{
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return -ENODEV;
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}
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void __weak arch_unregister_cpu(int 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 (invalid_phys_cpuid(pr->phys_id))
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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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cpus_write_lock();
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ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_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_cpu(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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cpus_write_unlock();
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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 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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dev_dbg(&device->dev, "Bus mastering arbitration control present\n");
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} else
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dev_dbg(&device->dev, "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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*/
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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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if (acpi_duplicate_processor_id(pr->acpi_id)) {
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if (pr->acpi_id == 0xff)
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dev_info_once(&device->dev,
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"Entry not well-defined, consider updating BIOS\n");
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else
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dev_err(&device->dev,
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"Failed to get unique processor _UID (0x%x)\n",
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pr->acpi_id);
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return -ENODEV;
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}
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pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
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pr->acpi_id);
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if (invalid_phys_cpuid(pr->phys_id))
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dev_dbg(&device->dev, "Failed to get CPU physical ID.\n");
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pr->id = acpi_map_cpuid(pr->phys_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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/*
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* Handle UP system running SMP kernel, with no CPU
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* entry in MADT
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*/
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if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
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pr->id = 0;
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}
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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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* NOTE: Even if the processor has a cpuid, it may not be present
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* because cpuid <-> apicid mapping is persistent now.
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*/
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if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
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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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dev_dbg(&device->dev, "Processor [%d:%d]\n", pr->id, pr->acpi_id);
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if (!object.processor.pblk_address)
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dev_dbg(&device->dev, "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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/*
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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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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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/* Removal */
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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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cpus_write_lock();
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/* Remove the CPU. */
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arch_unregister_cpu(pr->id);
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acpi_unmap_cpu(pr->id);
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cpus_write_unlock();
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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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#ifdef CONFIG_X86
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static bool acpi_hwp_native_thermal_lvt_set;
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static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
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u32 lvl,
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void *context,
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void **rv)
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{
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u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
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u32 capbuf[2];
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struct acpi_osc_context osc_context = {
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.uuid_str = sb_uuid_str,
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.rev = 1,
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.cap.length = 8,
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.cap.pointer = capbuf,
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};
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if (acpi_hwp_native_thermal_lvt_set)
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return AE_CTRL_TERMINATE;
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capbuf[0] = 0x0000;
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capbuf[1] = 0x1000; /* set bit 12 */
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if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
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if (osc_context.ret.pointer && osc_context.ret.length > 1) {
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u32 *capbuf_ret = osc_context.ret.pointer;
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|
|
if (capbuf_ret[1] & 0x1000) {
|
|
acpi_handle_info(handle,
|
|
"_OSC native thermal LVT Acked\n");
|
|
acpi_hwp_native_thermal_lvt_set = true;
|
|
}
|
|
}
|
|
kfree(osc_context.ret.pointer);
|
|
}
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
void __init acpi_early_processor_osc(void)
|
|
{
|
|
if (boot_cpu_has(X86_FEATURE_HWP)) {
|
|
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
acpi_hwp_native_thermal_lvt_osc,
|
|
NULL, NULL, NULL);
|
|
acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
|
|
acpi_hwp_native_thermal_lvt_osc,
|
|
NULL, NULL);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* The following ACPI IDs are known to be suitable for representing as
|
|
* processor devices.
|
|
*/
|
|
static const struct acpi_device_id processor_device_ids[] = {
|
|
|
|
{ ACPI_PROCESSOR_OBJECT_HID, },
|
|
{ ACPI_PROCESSOR_DEVICE_HID, },
|
|
|
|
{ }
|
|
};
|
|
|
|
static struct acpi_scan_handler processor_handler = {
|
|
.ids = processor_device_ids,
|
|
.attach = acpi_processor_add,
|
|
#ifdef CONFIG_ACPI_HOTPLUG_CPU
|
|
.detach = acpi_processor_remove,
|
|
#endif
|
|
.hotplug = {
|
|
.enabled = true,
|
|
},
|
|
};
|
|
|
|
static int acpi_processor_container_attach(struct acpi_device *dev,
|
|
const struct acpi_device_id *id)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static const struct acpi_device_id processor_container_ids[] = {
|
|
{ ACPI_PROCESSOR_CONTAINER_HID, },
|
|
{ }
|
|
};
|
|
|
|
static struct acpi_scan_handler processor_container_handler = {
|
|
.ids = processor_container_ids,
|
|
.attach = acpi_processor_container_attach,
|
|
};
|
|
|
|
/* The number of the unique processor IDs */
|
|
static int nr_unique_ids __initdata;
|
|
|
|
/* The number of the duplicate processor IDs */
|
|
static int nr_duplicate_ids;
|
|
|
|
/* Used to store the unique processor IDs */
|
|
static int unique_processor_ids[] __initdata = {
|
|
[0 ... NR_CPUS - 1] = -1,
|
|
};
|
|
|
|
/* Used to store the duplicate processor IDs */
|
|
static int duplicate_processor_ids[] = {
|
|
[0 ... NR_CPUS - 1] = -1,
|
|
};
|
|
|
|
static void __init processor_validated_ids_update(int proc_id)
|
|
{
|
|
int i;
|
|
|
|
if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS)
|
|
return;
|
|
|
|
/*
|
|
* Firstly, compare the proc_id with duplicate IDs, if the proc_id is
|
|
* already in the IDs, do nothing.
|
|
*/
|
|
for (i = 0; i < nr_duplicate_ids; i++) {
|
|
if (duplicate_processor_ids[i] == proc_id)
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Secondly, compare the proc_id with unique IDs, if the proc_id is in
|
|
* the IDs, put it in the duplicate IDs.
|
|
*/
|
|
for (i = 0; i < nr_unique_ids; i++) {
|
|
if (unique_processor_ids[i] == proc_id) {
|
|
duplicate_processor_ids[nr_duplicate_ids] = proc_id;
|
|
nr_duplicate_ids++;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lastly, the proc_id is a unique ID, put it in the unique IDs.
|
|
*/
|
|
unique_processor_ids[nr_unique_ids] = proc_id;
|
|
nr_unique_ids++;
|
|
}
|
|
|
|
static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
|
|
u32 lvl,
|
|
void *context,
|
|
void **rv)
|
|
{
|
|
acpi_status status;
|
|
acpi_object_type acpi_type;
|
|
unsigned long long uid;
|
|
union acpi_object object = { 0 };
|
|
struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
|
|
|
|
status = acpi_get_type(handle, &acpi_type);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
switch (acpi_type) {
|
|
case ACPI_TYPE_PROCESSOR:
|
|
status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
|
|
if (ACPI_FAILURE(status))
|
|
goto err;
|
|
uid = object.processor.proc_id;
|
|
break;
|
|
|
|
case ACPI_TYPE_DEVICE:
|
|
status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
|
|
if (ACPI_FAILURE(status))
|
|
goto err;
|
|
break;
|
|
default:
|
|
goto err;
|
|
}
|
|
|
|
processor_validated_ids_update(uid);
|
|
return AE_OK;
|
|
|
|
err:
|
|
/* Exit on error, but don't abort the namespace walk */
|
|
acpi_handle_info(handle, "Invalid processor object\n");
|
|
return AE_OK;
|
|
|
|
}
|
|
|
|
static void __init acpi_processor_check_duplicates(void)
|
|
{
|
|
/* check the correctness for all processors in ACPI namespace */
|
|
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
acpi_processor_ids_walk,
|
|
NULL, NULL, NULL);
|
|
acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk,
|
|
NULL, NULL);
|
|
}
|
|
|
|
bool acpi_duplicate_processor_id(int proc_id)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* compare the proc_id with duplicate IDs, if the proc_id is already
|
|
* in the duplicate IDs, return true, otherwise, return false.
|
|
*/
|
|
for (i = 0; i < nr_duplicate_ids; i++) {
|
|
if (duplicate_processor_ids[i] == proc_id)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void __init acpi_processor_init(void)
|
|
{
|
|
acpi_processor_check_duplicates();
|
|
acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
|
|
acpi_scan_add_handler(&processor_container_handler);
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI_PROCESSOR_CSTATE
|
|
/**
|
|
* acpi_processor_claim_cst_control - Request _CST control from the platform.
|
|
*/
|
|
bool acpi_processor_claim_cst_control(void)
|
|
{
|
|
static bool cst_control_claimed;
|
|
acpi_status status;
|
|
|
|
if (!acpi_gbl_FADT.cst_control || cst_control_claimed)
|
|
return true;
|
|
|
|
status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
|
|
acpi_gbl_FADT.cst_control, 8);
|
|
if (ACPI_FAILURE(status)) {
|
|
pr_warn("ACPI: Failed to claim processor _CST control\n");
|
|
return false;
|
|
}
|
|
|
|
cst_control_claimed = true;
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_processor_claim_cst_control);
|
|
|
|
/**
|
|
* acpi_processor_evaluate_cst - Evaluate the processor _CST control method.
|
|
* @handle: ACPI handle of the processor object containing the _CST.
|
|
* @cpu: The numeric ID of the target CPU.
|
|
* @info: Object write the C-states information into.
|
|
*
|
|
* Extract the C-state information for the given CPU from the output of the _CST
|
|
* control method under the corresponding ACPI processor object (or processor
|
|
* device object) and populate @info with it.
|
|
*
|
|
* If any ACPI_ADR_SPACE_FIXED_HARDWARE C-states are found, invoke
|
|
* acpi_processor_ffh_cstate_probe() to verify them and update the
|
|
* cpu_cstate_entry data for @cpu.
|
|
*/
|
|
int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu,
|
|
struct acpi_processor_power *info)
|
|
{
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
union acpi_object *cst;
|
|
acpi_status status;
|
|
u64 count;
|
|
int last_index = 0;
|
|
int i, ret = 0;
|
|
|
|
status = acpi_evaluate_object(handle, "_CST", NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_handle_debug(handle, "No _CST\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
cst = buffer.pointer;
|
|
|
|
/* There must be at least 2 elements. */
|
|
if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < 2) {
|
|
acpi_handle_warn(handle, "Invalid _CST output\n");
|
|
ret = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
count = cst->package.elements[0].integer.value;
|
|
|
|
/* Validate the number of C-states. */
|
|
if (count < 1 || count != cst->package.count - 1) {
|
|
acpi_handle_warn(handle, "Inconsistent _CST data\n");
|
|
ret = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
for (i = 1; i <= count; i++) {
|
|
union acpi_object *element;
|
|
union acpi_object *obj;
|
|
struct acpi_power_register *reg;
|
|
struct acpi_processor_cx cx;
|
|
|
|
/*
|
|
* If there is not enough space for all C-states, skip the
|
|
* excess ones and log a warning.
|
|
*/
|
|
if (last_index >= ACPI_PROCESSOR_MAX_POWER - 1) {
|
|
acpi_handle_warn(handle,
|
|
"No room for more idle states (limit: %d)\n",
|
|
ACPI_PROCESSOR_MAX_POWER - 1);
|
|
break;
|
|
}
|
|
|
|
memset(&cx, 0, sizeof(cx));
|
|
|
|
element = &cst->package.elements[i];
|
|
if (element->type != ACPI_TYPE_PACKAGE) {
|
|
acpi_handle_info(handle, "_CST C%d type(%x) is not package, skip...\n",
|
|
i, element->type);
|
|
continue;
|
|
}
|
|
|
|
if (element->package.count != 4) {
|
|
acpi_handle_info(handle, "_CST C%d package count(%d) is not 4, skip...\n",
|
|
i, element->package.count);
|
|
continue;
|
|
}
|
|
|
|
obj = &element->package.elements[0];
|
|
|
|
if (obj->type != ACPI_TYPE_BUFFER) {
|
|
acpi_handle_info(handle, "_CST C%d package element[0] type(%x) is not buffer, skip...\n",
|
|
i, obj->type);
|
|
continue;
|
|
}
|
|
|
|
reg = (struct acpi_power_register *)obj->buffer.pointer;
|
|
|
|
obj = &element->package.elements[1];
|
|
if (obj->type != ACPI_TYPE_INTEGER) {
|
|
acpi_handle_info(handle, "_CST C[%d] package element[1] type(%x) is not integer, skip...\n",
|
|
i, obj->type);
|
|
continue;
|
|
}
|
|
|
|
cx.type = obj->integer.value;
|
|
/*
|
|
* There are known cases in which the _CST output does not
|
|
* contain C1, so if the type of the first state found is not
|
|
* C1, leave an empty slot for C1 to be filled in later.
|
|
*/
|
|
if (i == 1 && cx.type != ACPI_STATE_C1)
|
|
last_index = 1;
|
|
|
|
cx.address = reg->address;
|
|
cx.index = last_index + 1;
|
|
|
|
if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
|
|
if (!acpi_processor_ffh_cstate_probe(cpu, &cx, reg)) {
|
|
/*
|
|
* In the majority of cases _CST describes C1 as
|
|
* a FIXED_HARDWARE C-state, but if the command
|
|
* line forbids using MWAIT, use CSTATE_HALT for
|
|
* C1 regardless.
|
|
*/
|
|
if (cx.type == ACPI_STATE_C1 &&
|
|
boot_option_idle_override == IDLE_NOMWAIT) {
|
|
cx.entry_method = ACPI_CSTATE_HALT;
|
|
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
|
|
} else {
|
|
cx.entry_method = ACPI_CSTATE_FFH;
|
|
}
|
|
} else if (cx.type == ACPI_STATE_C1) {
|
|
/*
|
|
* In the special case of C1, FIXED_HARDWARE can
|
|
* be handled by executing the HLT instruction.
|
|
*/
|
|
cx.entry_method = ACPI_CSTATE_HALT;
|
|
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
|
|
} else {
|
|
acpi_handle_info(handle, "_CST C%d declares FIXED_HARDWARE C-state but not supported in hardware, skip...\n",
|
|
i);
|
|
continue;
|
|
}
|
|
} else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
|
|
cx.entry_method = ACPI_CSTATE_SYSTEMIO;
|
|
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
|
|
cx.address);
|
|
} else {
|
|
acpi_handle_info(handle, "_CST C%d space_id(%x) neither FIXED_HARDWARE nor SYSTEM_IO, skip...\n",
|
|
i, reg->space_id);
|
|
continue;
|
|
}
|
|
|
|
if (cx.type == ACPI_STATE_C1)
|
|
cx.valid = 1;
|
|
|
|
obj = &element->package.elements[2];
|
|
if (obj->type != ACPI_TYPE_INTEGER) {
|
|
acpi_handle_info(handle, "_CST C%d package element[2] type(%x) not integer, skip...\n",
|
|
i, obj->type);
|
|
continue;
|
|
}
|
|
|
|
cx.latency = obj->integer.value;
|
|
|
|
obj = &element->package.elements[3];
|
|
if (obj->type != ACPI_TYPE_INTEGER) {
|
|
acpi_handle_info(handle, "_CST C%d package element[3] type(%x) not integer, skip...\n",
|
|
i, obj->type);
|
|
continue;
|
|
}
|
|
|
|
memcpy(&info->states[++last_index], &cx, sizeof(cx));
|
|
}
|
|
|
|
acpi_handle_info(handle, "Found %d idle states\n", last_index);
|
|
|
|
info->count = last_index;
|
|
|
|
end:
|
|
kfree(buffer.pointer);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_processor_evaluate_cst);
|
|
#endif /* CONFIG_ACPI_PROCESSOR_CSTATE */
|