2013-01-25 00:43:34 -07:00
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/*
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* Copyright (C) 2012 Intel Corporation
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* Author: Liu Jinsong <jinsong.liu@intel.com>
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* Author: Jiang Yunhong <yunhong.jiang@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*/
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2013-06-28 04:21:41 -06:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2013-01-25 00:43:34 -07:00
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/cpu.h>
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#include <linux/acpi.h>
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#include <linux/uaccess.h>
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#include <acpi/processor.h>
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#include <xen/acpi.h>
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#include <xen/interface/platform.h>
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#include <asm/xen/hypercall.h>
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#define PREFIX "ACPI:xen_cpu_hotplug:"
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#define INSTALL_NOTIFY_HANDLER 0
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#define UNINSTALL_NOTIFY_HANDLER 1
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static acpi_status xen_acpi_cpu_hotadd(struct acpi_processor *pr);
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/* --------------------------------------------------------------------------
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Driver Interface
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-------------------------------------------------------------------------- */
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static int xen_acpi_processor_enable(struct acpi_device *device)
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{
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acpi_status status = 0;
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unsigned long long value;
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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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2015-05-10 22:17:15 -06:00
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struct acpi_processor *pr = acpi_driver_data(device);
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2013-01-25 00:43:34 -07:00
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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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pr_err(PREFIX "Evaluating processor object\n");
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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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/* Declared with "Device" statement; match _UID */
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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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pr_err(PREFIX "Evaluating processor _UID\n");
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return -ENODEV;
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}
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pr->acpi_id = value;
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}
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pr->id = xen_pcpu_id(pr->acpi_id);
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2015-05-10 22:17:14 -06:00
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if (invalid_logical_cpuid(pr->id))
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2013-01-25 00:43:34 -07:00
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/* This cpu is not presented at hypervisor, try to hotadd it */
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if (ACPI_FAILURE(xen_acpi_cpu_hotadd(pr))) {
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pr_err(PREFIX "Hotadd CPU (acpi_id = %d) failed.\n",
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pr->acpi_id);
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return -ENODEV;
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}
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return 0;
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}
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2013-06-19 13:22:41 -06:00
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static int xen_acpi_processor_add(struct acpi_device *device)
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2013-01-25 00:43:34 -07:00
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{
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int ret;
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struct acpi_processor *pr;
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if (!device)
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return -EINVAL;
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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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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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ret = xen_acpi_processor_enable(device);
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if (ret)
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pr_err(PREFIX "Error when enabling Xen processor\n");
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return ret;
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}
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2013-02-24 17:06:13 -07:00
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static int xen_acpi_processor_remove(struct acpi_device *device)
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2013-01-25 00:43:34 -07:00
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{
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struct acpi_processor *pr;
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if (!device)
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return -EINVAL;
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pr = acpi_driver_data(device);
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if (!pr)
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return -EINVAL;
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kfree(pr);
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return 0;
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}
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/*--------------------------------------------------------------
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Acpi processor hotplug support
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--------------------------------------------------------------*/
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static int is_processor_present(acpi_handle handle)
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{
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acpi_status status;
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unsigned long long sta = 0;
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status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
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if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
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return 1;
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/*
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* _STA is mandatory for a processor that supports hot plug
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*/
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if (status == AE_NOT_FOUND)
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pr_info(PREFIX "Processor does not support hot plug\n");
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else
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pr_info(PREFIX "Processor Device is not present");
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return 0;
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}
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static int xen_apic_id(acpi_handle handle)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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struct acpi_madt_local_apic *lapic;
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int apic_id;
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if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
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return -EINVAL;
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if (!buffer.length || !buffer.pointer)
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return -EINVAL;
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obj = buffer.pointer;
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if (obj->type != ACPI_TYPE_BUFFER ||
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obj->buffer.length < sizeof(*lapic)) {
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kfree(buffer.pointer);
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return -EINVAL;
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}
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lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
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if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
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!(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
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kfree(buffer.pointer);
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return -EINVAL;
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}
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apic_id = (uint32_t)lapic->id;
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kfree(buffer.pointer);
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buffer.length = ACPI_ALLOCATE_BUFFER;
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buffer.pointer = NULL;
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return apic_id;
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}
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static int xen_hotadd_cpu(struct acpi_processor *pr)
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{
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int cpu_id, apic_id, pxm;
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struct xen_platform_op op;
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apic_id = xen_apic_id(pr->handle);
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if (apic_id < 0) {
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pr_err(PREFIX "Failed to get apic_id for acpi_id %d\n",
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pr->acpi_id);
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return -ENODEV;
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}
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pxm = xen_acpi_get_pxm(pr->handle);
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if (pxm < 0) {
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pr_err(PREFIX "Failed to get _PXM for acpi_id %d\n",
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pr->acpi_id);
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return pxm;
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}
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op.cmd = XENPF_cpu_hotadd;
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op.u.cpu_add.apic_id = apic_id;
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op.u.cpu_add.acpi_id = pr->acpi_id;
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op.u.cpu_add.pxm = pxm;
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cpu_id = HYPERVISOR_dom0_op(&op);
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if (cpu_id < 0)
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pr_err(PREFIX "Failed to hotadd CPU for acpi_id %d\n",
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pr->acpi_id);
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return cpu_id;
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}
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static acpi_status xen_acpi_cpu_hotadd(struct acpi_processor *pr)
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{
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if (!is_processor_present(pr->handle))
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return AE_ERROR;
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pr->id = xen_hotadd_cpu(pr);
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2015-05-10 22:17:14 -06:00
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if (invalid_logical_cpuid(pr->id))
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2013-01-25 00:43:34 -07:00
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return AE_ERROR;
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/*
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* Sync with Xen hypervisor, providing new /sys/.../xen_cpuX
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* interface after cpu hotadded.
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*/
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xen_pcpu_hotplug_sync();
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return AE_OK;
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}
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static int acpi_processor_device_remove(struct acpi_device *device)
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{
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pr_debug(PREFIX "Xen does not support CPU hotremove\n");
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return -ENOSYS;
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}
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static void acpi_processor_hotplug_notify(acpi_handle handle,
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u32 event, void *data)
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{
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struct acpi_processor *pr;
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struct acpi_device *device = NULL;
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u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
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int result;
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2013-02-16 20:47:24 -07:00
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acpi_scan_lock_acquire();
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2013-01-25 00:43:34 -07:00
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switch (event) {
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case ACPI_NOTIFY_BUS_CHECK:
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case ACPI_NOTIFY_DEVICE_CHECK:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Processor driver received %s event\n",
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(event == ACPI_NOTIFY_BUS_CHECK) ?
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"ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
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if (!is_processor_present(handle))
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break;
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ACPI / scan: Add acpi_device objects for all device nodes in the namespace
Modify the ACPI namespace scanning code to register a struct
acpi_device object for every namespace node representing a device,
processor and so on, even if the device represented by that namespace
node is reported to be not present and not functional by _STA.
There are multiple reasons to do that. First of all, it avoids
quite a lot of overhead when struct acpi_device objects are
deleted every time acpi_bus_trim() is run and then added again
by a subsequent acpi_bus_scan() for the same scope, although the
namespace objects they correspond to stay in memory all the time
(which always is the case on a vast majority of systems).
Second, it will allow user space to see that there are namespace
nodes representing devices that are not present at the moment and may
be added to the system. It will also allow user space to evaluate
_SUN for those nodes to check what physical slots the "missing"
devices may be put into and it will make sense to add a sysfs
attribute for _STA evaluation after this change (that will be
useful for thermal management on some systems).
Next, it will help to consolidate the ACPI hotplug handling among
subsystems by making it possible to store hotplug-related information
in struct acpi_device objects in a standard common way.
Finally, it will help to avoid a race condition related to the
deletion of ACPI namespace nodes. Namely, namespace nodes may be
deleted as a result of a table unload triggered by _EJ0 or _DCK.
If a hotplug notification for one of those nodes is triggered
right before the deletion and it executes a hotplug callback
via acpi_hotplug_execute(), the ACPI handle passed to that
callback may be stale when the callback actually runs. One way
to work around that is to always pass struct acpi_device pointers
to hotplug callbacks after doing a get_device() on the objects in
question which eliminates the use-after-free possibility (the ACPI
handles in those objects are invalidated by acpi_scan_drop_device(),
so they will trigger ACPICA errors on attempts to use them).
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
2013-11-22 13:54:37 -07:00
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acpi_bus_get_device(handle, &device);
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if (acpi_device_enumerated(device))
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2013-01-25 00:43:34 -07:00
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break;
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2013-02-16 20:47:24 -07:00
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result = acpi_bus_scan(handle);
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2013-01-25 00:43:34 -07:00
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if (result) {
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pr_err(PREFIX "Unable to add the device\n");
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break;
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}
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ACPI / scan: Add acpi_device objects for all device nodes in the namespace
Modify the ACPI namespace scanning code to register a struct
acpi_device object for every namespace node representing a device,
processor and so on, even if the device represented by that namespace
node is reported to be not present and not functional by _STA.
There are multiple reasons to do that. First of all, it avoids
quite a lot of overhead when struct acpi_device objects are
deleted every time acpi_bus_trim() is run and then added again
by a subsequent acpi_bus_scan() for the same scope, although the
namespace objects they correspond to stay in memory all the time
(which always is the case on a vast majority of systems).
Second, it will allow user space to see that there are namespace
nodes representing devices that are not present at the moment and may
be added to the system. It will also allow user space to evaluate
_SUN for those nodes to check what physical slots the "missing"
devices may be put into and it will make sense to add a sysfs
attribute for _STA evaluation after this change (that will be
useful for thermal management on some systems).
Next, it will help to consolidate the ACPI hotplug handling among
subsystems by making it possible to store hotplug-related information
in struct acpi_device objects in a standard common way.
Finally, it will help to avoid a race condition related to the
deletion of ACPI namespace nodes. Namely, namespace nodes may be
deleted as a result of a table unload triggered by _EJ0 or _DCK.
If a hotplug notification for one of those nodes is triggered
right before the deletion and it executes a hotplug callback
via acpi_hotplug_execute(), the ACPI handle passed to that
callback may be stale when the callback actually runs. One way
to work around that is to always pass struct acpi_device pointers
to hotplug callbacks after doing a get_device() on the objects in
question which eliminates the use-after-free possibility (the ACPI
handles in those objects are invalidated by acpi_scan_drop_device(),
so they will trigger ACPICA errors on attempts to use them).
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
2013-11-22 13:54:37 -07:00
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device = NULL;
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acpi_bus_get_device(handle, &device);
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if (!acpi_device_enumerated(device)) {
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2013-02-16 20:47:24 -07:00
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pr_err(PREFIX "Missing device object\n");
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break;
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}
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2013-01-25 00:43:34 -07:00
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ost_code = ACPI_OST_SC_SUCCESS;
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break;
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case ACPI_NOTIFY_EJECT_REQUEST:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"received ACPI_NOTIFY_EJECT_REQUEST\n"));
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if (acpi_bus_get_device(handle, &device)) {
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pr_err(PREFIX "Device don't exist, dropping EJECT\n");
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break;
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}
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pr = acpi_driver_data(device);
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if (!pr) {
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pr_err(PREFIX "Driver data is NULL, dropping EJECT\n");
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break;
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}
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/*
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* TBD: implement acpi_processor_device_remove if Xen support
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* CPU hotremove in the future.
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*/
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acpi_processor_device_remove(device);
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Unsupported event [0x%x]\n", event));
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/* non-hotplug event; possibly handled by other handler */
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2013-02-16 20:47:24 -07:00
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goto out;
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2013-01-25 00:43:34 -07:00
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}
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2014-02-20 17:07:17 -07:00
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(void) acpi_evaluate_ost(handle, event, ost_code, NULL);
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2013-02-16 20:47:24 -07:00
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out:
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|
acpi_scan_lock_release();
|
2013-01-25 00:43:34 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static acpi_status is_processor_device(acpi_handle handle)
|
|
|
|
{
|
|
|
|
struct acpi_device_info *info;
|
|
|
|
char *hid;
|
|
|
|
acpi_status status;
|
|
|
|
|
|
|
|
status = acpi_get_object_info(handle, &info);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
|
|
return status;
|
|
|
|
|
|
|
|
if (info->type == ACPI_TYPE_PROCESSOR) {
|
|
|
|
kfree(info);
|
|
|
|
return AE_OK; /* found a processor object */
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!(info->valid & ACPI_VALID_HID)) {
|
|
|
|
kfree(info);
|
|
|
|
return AE_ERROR;
|
|
|
|
}
|
|
|
|
|
|
|
|
hid = info->hardware_id.string;
|
|
|
|
if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
|
|
|
|
kfree(info);
|
|
|
|
return AE_ERROR;
|
|
|
|
}
|
|
|
|
|
|
|
|
kfree(info);
|
|
|
|
return AE_OK; /* found a processor device object */
|
|
|
|
}
|
|
|
|
|
|
|
|
static acpi_status
|
|
|
|
processor_walk_namespace_cb(acpi_handle handle,
|
|
|
|
u32 lvl, void *context, void **rv)
|
|
|
|
{
|
|
|
|
acpi_status status;
|
|
|
|
int *action = context;
|
|
|
|
|
|
|
|
status = is_processor_device(handle);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
|
|
return AE_OK; /* not a processor; continue to walk */
|
|
|
|
|
|
|
|
switch (*action) {
|
|
|
|
case INSTALL_NOTIFY_HANDLER:
|
|
|
|
acpi_install_notify_handler(handle,
|
|
|
|
ACPI_SYSTEM_NOTIFY,
|
|
|
|
acpi_processor_hotplug_notify,
|
|
|
|
NULL);
|
|
|
|
break;
|
|
|
|
case UNINSTALL_NOTIFY_HANDLER:
|
|
|
|
acpi_remove_notify_handler(handle,
|
|
|
|
ACPI_SYSTEM_NOTIFY,
|
|
|
|
acpi_processor_hotplug_notify);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* found a processor; skip walking underneath */
|
|
|
|
return AE_CTRL_DEPTH;
|
|
|
|
}
|
|
|
|
|
|
|
|
static
|
|
|
|
void acpi_processor_install_hotplug_notify(void)
|
|
|
|
{
|
|
|
|
int action = INSTALL_NOTIFY_HANDLER;
|
|
|
|
acpi_walk_namespace(ACPI_TYPE_ANY,
|
|
|
|
ACPI_ROOT_OBJECT,
|
|
|
|
ACPI_UINT32_MAX,
|
|
|
|
processor_walk_namespace_cb, NULL, &action, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static
|
|
|
|
void acpi_processor_uninstall_hotplug_notify(void)
|
|
|
|
{
|
|
|
|
int action = UNINSTALL_NOTIFY_HANDLER;
|
|
|
|
acpi_walk_namespace(ACPI_TYPE_ANY,
|
|
|
|
ACPI_ROOT_OBJECT,
|
|
|
|
ACPI_UINT32_MAX,
|
|
|
|
processor_walk_namespace_cb, NULL, &action, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct acpi_device_id processor_device_ids[] = {
|
|
|
|
{ACPI_PROCESSOR_OBJECT_HID, 0},
|
|
|
|
{ACPI_PROCESSOR_DEVICE_HID, 0},
|
|
|
|
{"", 0},
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(acpi, processor_device_ids);
|
|
|
|
|
|
|
|
static struct acpi_driver xen_acpi_processor_driver = {
|
|
|
|
.name = "processor",
|
|
|
|
.class = ACPI_PROCESSOR_CLASS,
|
|
|
|
.ids = processor_device_ids,
|
|
|
|
.ops = {
|
|
|
|
.add = xen_acpi_processor_add,
|
|
|
|
.remove = xen_acpi_processor_remove,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init xen_acpi_processor_init(void)
|
|
|
|
{
|
|
|
|
int result = 0;
|
|
|
|
|
|
|
|
if (!xen_initial_domain())
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
/* unregister the stub which only used to reserve driver space */
|
|
|
|
xen_stub_processor_exit();
|
|
|
|
|
|
|
|
result = acpi_bus_register_driver(&xen_acpi_processor_driver);
|
|
|
|
if (result < 0) {
|
|
|
|
xen_stub_processor_init();
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
acpi_processor_install_hotplug_notify();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit xen_acpi_processor_exit(void)
|
|
|
|
{
|
|
|
|
if (!xen_initial_domain())
|
|
|
|
return;
|
|
|
|
|
|
|
|
acpi_processor_uninstall_hotplug_notify();
|
|
|
|
|
|
|
|
acpi_bus_unregister_driver(&xen_acpi_processor_driver);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* stub reserve space again to prevent any chance of native
|
|
|
|
* driver loading.
|
|
|
|
*/
|
|
|
|
xen_stub_processor_init();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(xen_acpi_processor_init);
|
|
|
|
module_exit(xen_acpi_processor_exit);
|
|
|
|
ACPI_MODULE_NAME("xen-acpi-cpuhotplug");
|
|
|
|
MODULE_AUTHOR("Liu Jinsong <jinsong.liu@intel.com>");
|
|
|
|
MODULE_DESCRIPTION("Xen Hotplug CPU Driver");
|
|
|
|
MODULE_LICENSE("GPL");
|