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path: root/drivers/xen/xen-acpi-cpuhotplug.c
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Diffstat (limited to 'drivers/xen/xen-acpi-cpuhotplug.c')
-rw-r--r--drivers/xen/xen-acpi-cpuhotplug.c446
1 files changed, 0 insertions, 446 deletions
diff --git a/drivers/xen/xen-acpi-cpuhotplug.c b/drivers/xen/xen-acpi-cpuhotplug.c
deleted file mode 100644
index 00ab1ece02e5..000000000000
--- a/drivers/xen/xen-acpi-cpuhotplug.c
+++ /dev/null
@@ -1,446 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2012 Intel Corporation
- * Author: Liu Jinsong <jinsong.liu@intel.com>
- * Author: Jiang Yunhong <yunhong.jiang@intel.com>
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/cpu.h>
-#include <linux/acpi.h>
-#include <linux/uaccess.h>
-#include <acpi/processor.h>
-#include <xen/acpi.h>
-#include <xen/interface/platform.h>
-#include <asm/xen/hypercall.h>
-
-#define PREFIX "ACPI:xen_cpu_hotplug:"
-
-#define INSTALL_NOTIFY_HANDLER 0
-#define UNINSTALL_NOTIFY_HANDLER 1
-
-static acpi_status xen_acpi_cpu_hotadd(struct acpi_processor *pr);
-
-/* --------------------------------------------------------------------------
- Driver Interface
--------------------------------------------------------------------------- */
-
-static int xen_acpi_processor_enable(struct acpi_device *device)
-{
- acpi_status status = 0;
- unsigned long long value;
- union acpi_object object = { 0 };
- struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
- struct acpi_processor *pr = acpi_driver_data(device);
-
- if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
- /* Declared with "Processor" statement; match ProcessorID */
- status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
- if (ACPI_FAILURE(status)) {
- pr_err(PREFIX "Evaluating processor object\n");
- return -ENODEV;
- }
-
- pr->acpi_id = object.processor.proc_id;
- } else {
- /* Declared with "Device" statement; match _UID */
- status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
- NULL, &value);
- if (ACPI_FAILURE(status)) {
- pr_err(PREFIX "Evaluating processor _UID\n");
- return -ENODEV;
- }
-
- pr->acpi_id = value;
- }
-
- pr->id = xen_pcpu_id(pr->acpi_id);
-
- if (invalid_logical_cpuid(pr->id))
- /* This cpu is not presented at hypervisor, try to hotadd it */
- if (ACPI_FAILURE(xen_acpi_cpu_hotadd(pr))) {
- pr_err(PREFIX "Hotadd CPU (acpi_id = %d) failed.\n",
- pr->acpi_id);
- return -ENODEV;
- }
-
- return 0;
-}
-
-static int xen_acpi_processor_add(struct acpi_device *device)
-{
- int ret;
- struct acpi_processor *pr;
-
- if (!device)
- return -EINVAL;
-
- pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
- if (!pr)
- return -ENOMEM;
-
- pr->handle = device->handle;
- strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
- strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
- device->driver_data = pr;
-
- ret = xen_acpi_processor_enable(device);
- if (ret)
- pr_err(PREFIX "Error when enabling Xen processor\n");
-
- return ret;
-}
-
-static int xen_acpi_processor_remove(struct acpi_device *device)
-{
- struct acpi_processor *pr;
-
- if (!device)
- return -EINVAL;
-
- pr = acpi_driver_data(device);
- if (!pr)
- return -EINVAL;
-
- kfree(pr);
- return 0;
-}
-
-/*--------------------------------------------------------------
- Acpi processor hotplug support
---------------------------------------------------------------*/
-
-static int is_processor_present(acpi_handle handle)
-{
- acpi_status status;
- unsigned long long sta = 0;
-
-
- status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
-
- if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
- return 1;
-
- /*
- * _STA is mandatory for a processor that supports hot plug
- */
- if (status == AE_NOT_FOUND)
- pr_info(PREFIX "Processor does not support hot plug\n");
- else
- pr_info(PREFIX "Processor Device is not present");
- return 0;
-}
-
-static int xen_apic_id(acpi_handle handle)
-{
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- union acpi_object *obj;
- struct acpi_madt_local_apic *lapic;
- int apic_id;
-
- if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
- return -EINVAL;
-
- if (!buffer.length || !buffer.pointer)
- return -EINVAL;
-
- obj = buffer.pointer;
- if (obj->type != ACPI_TYPE_BUFFER ||
- obj->buffer.length < sizeof(*lapic)) {
- kfree(buffer.pointer);
- return -EINVAL;
- }
-
- lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
-
- if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
- !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
- kfree(buffer.pointer);
- return -EINVAL;
- }
-
- apic_id = (uint32_t)lapic->id;
- kfree(buffer.pointer);
- buffer.length = ACPI_ALLOCATE_BUFFER;
- buffer.pointer = NULL;
-
- return apic_id;
-}
-
-static int xen_hotadd_cpu(struct acpi_processor *pr)
-{
- int cpu_id, apic_id, pxm;
- struct xen_platform_op op;
-
- apic_id = xen_apic_id(pr->handle);
- if (apic_id < 0) {
- pr_err(PREFIX "Failed to get apic_id for acpi_id %d\n",
- pr->acpi_id);
- return -ENODEV;
- }
-
- pxm = xen_acpi_get_pxm(pr->handle);
- if (pxm < 0) {
- pr_err(PREFIX "Failed to get _PXM for acpi_id %d\n",
- pr->acpi_id);
- return pxm;
- }
-
- op.cmd = XENPF_cpu_hotadd;
- op.u.cpu_add.apic_id = apic_id;
- op.u.cpu_add.acpi_id = pr->acpi_id;
- op.u.cpu_add.pxm = pxm;
-
- cpu_id = HYPERVISOR_platform_op(&op);
- if (cpu_id < 0)
- pr_err(PREFIX "Failed to hotadd CPU for acpi_id %d\n",
- pr->acpi_id);
-
- return cpu_id;
-}
-
-static acpi_status xen_acpi_cpu_hotadd(struct acpi_processor *pr)
-{
- if (!is_processor_present(pr->handle))
- return AE_ERROR;
-
- pr->id = xen_hotadd_cpu(pr);
- if (invalid_logical_cpuid(pr->id))
- return AE_ERROR;
-
- /*
- * Sync with Xen hypervisor, providing new /sys/.../xen_cpuX
- * interface after cpu hotadded.
- */
- xen_pcpu_hotplug_sync();
-
- return AE_OK;
-}
-
-static int acpi_processor_device_remove(struct acpi_device *device)
-{
- pr_debug(PREFIX "Xen does not support CPU hotremove\n");
-
- return -ENOSYS;
-}
-
-static void acpi_processor_hotplug_notify(acpi_handle handle,
- u32 event, void *data)
-{
- struct acpi_processor *pr;
- struct acpi_device *device = NULL;
- u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
- int result;
-
- acpi_scan_lock_acquire();
-
- switch (event) {
- case ACPI_NOTIFY_BUS_CHECK:
- case ACPI_NOTIFY_DEVICE_CHECK:
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Processor driver received %s event\n",
- (event == ACPI_NOTIFY_BUS_CHECK) ?
- "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
-
- if (!is_processor_present(handle))
- break;
-
- acpi_bus_get_device(handle, &device);
- if (acpi_device_enumerated(device))
- break;
-
- result = acpi_bus_scan(handle);
- if (result) {
- pr_err(PREFIX "Unable to add the device\n");
- break;
- }
- device = NULL;
- acpi_bus_get_device(handle, &device);
- if (!acpi_device_enumerated(device)) {
- pr_err(PREFIX "Missing device object\n");
- break;
- }
- ost_code = ACPI_OST_SC_SUCCESS;
- break;
-
- case ACPI_NOTIFY_EJECT_REQUEST:
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "received ACPI_NOTIFY_EJECT_REQUEST\n"));
-
- if (acpi_bus_get_device(handle, &device)) {
- pr_err(PREFIX "Device don't exist, dropping EJECT\n");
- break;
- }
- pr = acpi_driver_data(device);
- if (!pr) {
- pr_err(PREFIX "Driver data is NULL, dropping EJECT\n");
- break;
- }
-
- /*
- * TBD: implement acpi_processor_device_remove if Xen support
- * CPU hotremove in the future.
- */
- acpi_processor_device_remove(device);
- break;
-
- default:
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Unsupported event [0x%x]\n", event));
-
- /* non-hotplug event; possibly handled by other handler */
- goto out;
- }
-
- (void) acpi_evaluate_ost(handle, event, ost_code, NULL);
-
-out:
- acpi_scan_lock_release();
-}
-
-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");