mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Stefano Stabellini](/assets/img/avatar_default.png)
The dom0_op hypercall has been renamed to platform_op since Xen 3.2, which is ancient, and modern upstream Linux kernels cannot run as dom0 and it anymore anyway. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
456 lines
11 KiB
C
456 lines
11 KiB
C
/*
|
|
* Copyright (C) 2012 Intel Corporation
|
|
* Author: Liu Jinsong <jinsong.liu@intel.com>
|
|
* Author: Jiang Yunhong <yunhong.jiang@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or (at
|
|
* your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for more
|
|
* details.
|
|
*/
|
|
|
|
#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");
|