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446 lines
10 KiB
446 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2012 Intel Corporation |
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* Author: Liu Jinsong <[email protected]> |
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* Author: Jiang Yunhong <[email protected]> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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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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struct acpi_processor *pr = acpi_driver_data(device); |
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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 (invalid_logical_cpuid(pr->id)) |
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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 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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static int xen_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) |
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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_platform_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 (invalid_logical_cpuid(pr->id)) |
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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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acpi_scan_lock_acquire(); |
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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_bus_get_device(handle, &device); |
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if (acpi_device_enumerated(device)) |
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break; |
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result = acpi_bus_scan(handle); |
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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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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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pr_err(PREFIX "Missing device object\n"); |
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break; |
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} |
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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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goto out; |
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} |
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(void) acpi_evaluate_ost(handle, event, ost_code, NULL); |
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out: |
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acpi_scan_lock_release(); |
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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 |
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void acpi_processor_install_hotplug_notify(void) |
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{ |
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int action = INSTALL_NOTIFY_HANDLER; |
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acpi_walk_namespace(ACPI_TYPE_ANY, |
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ACPI_ROOT_OBJECT, |
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ACPI_UINT32_MAX, |
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processor_walk_namespace_cb, NULL, &action, NULL); |
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} |
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static |
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void acpi_processor_uninstall_hotplug_notify(void) |
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{ |
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int action = UNINSTALL_NOTIFY_HANDLER; |
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acpi_walk_namespace(ACPI_TYPE_ANY, |
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ACPI_ROOT_OBJECT, |
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ACPI_UINT32_MAX, |
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processor_walk_namespace_cb, NULL, &action, NULL); |
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} |
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static const struct acpi_device_id processor_device_ids[] = { |
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{ACPI_PROCESSOR_OBJECT_HID, 0}, |
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{ACPI_PROCESSOR_DEVICE_HID, 0}, |
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{"", 0}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, processor_device_ids); |
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static struct acpi_driver xen_acpi_processor_driver = { |
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.name = "processor", |
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.class = ACPI_PROCESSOR_CLASS, |
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.ids = processor_device_ids, |
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.ops = { |
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.add = xen_acpi_processor_add, |
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.remove = xen_acpi_processor_remove, |
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}, |
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}; |
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static int __init xen_acpi_processor_init(void) |
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{ |
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int result = 0; |
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if (!xen_initial_domain()) |
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return -ENODEV; |
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/* unregister the stub which only used to reserve driver space */ |
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xen_stub_processor_exit(); |
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result = acpi_bus_register_driver(&xen_acpi_processor_driver); |
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if (result < 0) { |
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xen_stub_processor_init(); |
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return result; |
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} |
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acpi_processor_install_hotplug_notify(); |
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return 0; |
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} |
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static void __exit xen_acpi_processor_exit(void) |
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{ |
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if (!xen_initial_domain()) |
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return; |
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acpi_processor_uninstall_hotplug_notify(); |
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acpi_bus_unregister_driver(&xen_acpi_processor_driver); |
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/* |
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* stub reserve space again to prevent any chance of native |
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* driver loading. |
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*/ |
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xen_stub_processor_init(); |
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return; |
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} |
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module_init(xen_acpi_processor_init); |
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module_exit(xen_acpi_processor_exit); |
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ACPI_MODULE_NAME("xen-acpi-cpuhotplug"); |
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MODULE_AUTHOR("Liu Jinsong <[email protected]>"); |
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MODULE_DESCRIPTION("Xen Hotplug CPU Driver"); |
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MODULE_LICENSE("GPL");
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