2013-01-25 15:43:34 +08:00
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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 18:21:41 +08:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2013-01-25 15:43:34 +08:00
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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/acpi_bus.h>
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#include <acpi/acpi_drivers.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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struct acpi_processor *pr;
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pr = acpi_driver_data(device);
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if (!pr) {
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pr_err(PREFIX "Cannot find driver data\n");
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return -EINVAL;
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}
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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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if ((int)pr->id < 0)
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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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static int __cpuinit xen_acpi_processor_add(struct acpi_device *device)
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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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2013-02-25 08:06:13 +08:00
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static int xen_acpi_processor_remove(struct acpi_device *device)
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2013-01-25 15:43:34 +08:00
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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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if ((int)pr->id < 0)
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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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2013-02-17 11:47:24 +08:00
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acpi_scan_lock_acquire();
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2013-01-25 15:43:34 +08:00
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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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if (!acpi_bus_get_device(handle, &device))
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break;
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2013-02-17 11:47:24 +08:00
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result = acpi_bus_scan(handle);
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2013-01-25 15:43:34 +08:00
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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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2013-02-17 11:47:24 +08:00
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result = acpi_bus_get_device(handle, &device);
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if (result) {
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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 15:43:34 +08:00
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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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2013-02-17 11:47:24 +08:00
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goto out;
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2013-01-25 15:43:34 +08:00
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}
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(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
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2013-02-17 11:47:24 +08:00
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out:
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acpi_scan_lock_release();
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2013-01-25 15:43:34 +08:00
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}
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static acpi_status is_processor_device(acpi_handle handle)
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{
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struct acpi_device_info *info;
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char *hid;
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acpi_status status;
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status = acpi_get_object_info(handle, &info);
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if (ACPI_FAILURE(status))
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return status;
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if (info->type == ACPI_TYPE_PROCESSOR) {
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kfree(info);
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return AE_OK; /* found a processor object */
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}
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if (!(info->valid & ACPI_VALID_HID)) {
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kfree(info);
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return AE_ERROR;
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}
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hid = info->hardware_id.string;
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if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
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kfree(info);
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return AE_ERROR;
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}
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kfree(info);
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return AE_OK; /* found a processor device object */
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}
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static acpi_status
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processor_walk_namespace_cb(acpi_handle handle,
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u32 lvl, void *context, void **rv)
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{
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acpi_status status;
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int *action = context;
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status = is_processor_device(handle);
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if (ACPI_FAILURE(status))
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return AE_OK; /* not a processor; continue to walk */
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switch (*action) {
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case INSTALL_NOTIFY_HANDLER:
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acpi_install_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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acpi_processor_hotplug_notify,
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NULL);
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break;
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case UNINSTALL_NOTIFY_HANDLER:
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acpi_remove_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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acpi_processor_hotplug_notify);
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break;
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default:
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break;
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}
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/* found a processor; skip walking underneath */
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|
return AE_CTRL_DEPTH;
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|
|
|
}
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|
|
|
|
|
|
|
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");
|