296 lines
7.4 KiB
C
296 lines
7.4 KiB
C
/*
|
|
* err_inject.c -
|
|
* 1.) Inject errors to a processor.
|
|
* 2.) Query error injection capabilities.
|
|
* This driver along with user space code can be acting as an error
|
|
* injection tool.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation
|
|
* Copyright (C) 2006, Intel Corp. All rights reserved.
|
|
*
|
|
*/
|
|
#include <linux/sysdev.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/module.h>
|
|
|
|
#define ERR_INJ_DEBUG
|
|
|
|
#define ERR_DATA_BUFFER_SIZE 3 // Three 8-byte;
|
|
|
|
#define define_one_ro(name) \
|
|
static SYSDEV_ATTR(name, 0444, show_##name, NULL)
|
|
|
|
#define define_one_rw(name) \
|
|
static SYSDEV_ATTR(name, 0644, show_##name, store_##name)
|
|
|
|
static u64 call_start[NR_CPUS];
|
|
static u64 phys_addr[NR_CPUS];
|
|
static u64 err_type_info[NR_CPUS];
|
|
static u64 err_struct_info[NR_CPUS];
|
|
static struct {
|
|
u64 data1;
|
|
u64 data2;
|
|
u64 data3;
|
|
} __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS];
|
|
static s64 status[NR_CPUS];
|
|
static u64 capabilities[NR_CPUS];
|
|
static u64 resources[NR_CPUS];
|
|
|
|
#define show(name) \
|
|
static ssize_t \
|
|
show_##name(struct sys_device *dev, char *buf) \
|
|
{ \
|
|
u32 cpu=dev->id; \
|
|
return sprintf(buf, "%lx\n", name[cpu]); \
|
|
}
|
|
|
|
#define store(name) \
|
|
static ssize_t \
|
|
store_##name(struct sys_device *dev, const char *buf, size_t size) \
|
|
{ \
|
|
unsigned int cpu=dev->id; \
|
|
name[cpu] = simple_strtoull(buf, NULL, 16); \
|
|
return size; \
|
|
}
|
|
|
|
show(call_start)
|
|
|
|
/* It's user's responsibility to call the PAL procedure on a specific
|
|
* processor. The cpu number in driver is only used for storing data.
|
|
*/
|
|
static ssize_t
|
|
store_call_start(struct sys_device *dev, const char *buf, size_t size)
|
|
{
|
|
unsigned int cpu=dev->id;
|
|
unsigned long call_start = simple_strtoull(buf, NULL, 16);
|
|
|
|
#ifdef ERR_INJ_DEBUG
|
|
printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu);
|
|
printk(KERN_DEBUG "err_type_info=%lx,\n", err_type_info[cpu]);
|
|
printk(KERN_DEBUG "err_struct_info=%lx,\n", err_struct_info[cpu]);
|
|
printk(KERN_DEBUG "err_data_buffer=%lx, %lx, %lx.\n",
|
|
err_data_buffer[cpu].data1,
|
|
err_data_buffer[cpu].data2,
|
|
err_data_buffer[cpu].data3);
|
|
#endif
|
|
switch (call_start) {
|
|
case 0: /* Do nothing. */
|
|
break;
|
|
case 1: /* Call pal_mc_error_inject in physical mode. */
|
|
status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu],
|
|
err_struct_info[cpu],
|
|
ia64_tpa(&err_data_buffer[cpu]),
|
|
&capabilities[cpu],
|
|
&resources[cpu]);
|
|
break;
|
|
case 2: /* Call pal_mc_error_inject in virtual mode. */
|
|
status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu],
|
|
err_struct_info[cpu],
|
|
ia64_tpa(&err_data_buffer[cpu]),
|
|
&capabilities[cpu],
|
|
&resources[cpu]);
|
|
break;
|
|
default:
|
|
status[cpu] = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
#ifdef ERR_INJ_DEBUG
|
|
printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]);
|
|
printk(KERN_DEBUG "capapbilities=%lx,\n", capabilities[cpu]);
|
|
printk(KERN_DEBUG "resources=%lx\n", resources[cpu]);
|
|
#endif
|
|
return size;
|
|
}
|
|
|
|
show(err_type_info)
|
|
store(err_type_info)
|
|
|
|
static ssize_t
|
|
show_virtual_to_phys(struct sys_device *dev, char *buf)
|
|
{
|
|
unsigned int cpu=dev->id;
|
|
return sprintf(buf, "%lx\n", phys_addr[cpu]);
|
|
}
|
|
|
|
static ssize_t
|
|
store_virtual_to_phys(struct sys_device *dev, const char *buf, size_t size)
|
|
{
|
|
unsigned int cpu=dev->id;
|
|
u64 virt_addr=simple_strtoull(buf, NULL, 16);
|
|
int ret;
|
|
|
|
ret = get_user_pages(current, current->mm, virt_addr,
|
|
1, VM_READ, 0, NULL, NULL);
|
|
if (ret<=0) {
|
|
#ifdef ERR_INJ_DEBUG
|
|
printk("Virtual address %lx is not existing.\n",virt_addr);
|
|
#endif
|
|
return -EINVAL;
|
|
}
|
|
|
|
phys_addr[cpu] = ia64_tpa(virt_addr);
|
|
return size;
|
|
}
|
|
|
|
show(err_struct_info)
|
|
store(err_struct_info)
|
|
|
|
static ssize_t
|
|
show_err_data_buffer(struct sys_device *dev, char *buf)
|
|
{
|
|
unsigned int cpu=dev->id;
|
|
|
|
return sprintf(buf, "%lx, %lx, %lx\n",
|
|
err_data_buffer[cpu].data1,
|
|
err_data_buffer[cpu].data2,
|
|
err_data_buffer[cpu].data3);
|
|
}
|
|
|
|
static ssize_t
|
|
store_err_data_buffer(struct sys_device *dev, const char *buf, size_t size)
|
|
{
|
|
unsigned int cpu=dev->id;
|
|
int ret;
|
|
|
|
#ifdef ERR_INJ_DEBUG
|
|
printk("write err_data_buffer=[%lx,%lx,%lx] on cpu%d\n",
|
|
err_data_buffer[cpu].data1,
|
|
err_data_buffer[cpu].data2,
|
|
err_data_buffer[cpu].data3,
|
|
cpu);
|
|
#endif
|
|
ret=sscanf(buf, "%lx, %lx, %lx",
|
|
&err_data_buffer[cpu].data1,
|
|
&err_data_buffer[cpu].data2,
|
|
&err_data_buffer[cpu].data3);
|
|
if (ret!=ERR_DATA_BUFFER_SIZE)
|
|
return -EINVAL;
|
|
|
|
return size;
|
|
}
|
|
|
|
show(status)
|
|
show(capabilities)
|
|
show(resources)
|
|
|
|
define_one_rw(call_start);
|
|
define_one_rw(err_type_info);
|
|
define_one_rw(err_struct_info);
|
|
define_one_rw(err_data_buffer);
|
|
define_one_rw(virtual_to_phys);
|
|
define_one_ro(status);
|
|
define_one_ro(capabilities);
|
|
define_one_ro(resources);
|
|
|
|
static struct attribute *default_attrs[] = {
|
|
&attr_call_start.attr,
|
|
&attr_virtual_to_phys.attr,
|
|
&attr_err_type_info.attr,
|
|
&attr_err_struct_info.attr,
|
|
&attr_err_data_buffer.attr,
|
|
&attr_status.attr,
|
|
&attr_capabilities.attr,
|
|
&attr_resources.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group err_inject_attr_group = {
|
|
.attrs = default_attrs,
|
|
.name = "err_inject"
|
|
};
|
|
/* Add/Remove err_inject interface for CPU device */
|
|
static int __cpuinit err_inject_add_dev(struct sys_device * sys_dev)
|
|
{
|
|
return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group);
|
|
}
|
|
|
|
static int __cpuinit err_inject_remove_dev(struct sys_device * sys_dev)
|
|
{
|
|
sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
|
|
return 0;
|
|
}
|
|
static int __cpuinit err_inject_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
unsigned int cpu = (unsigned long)hcpu;
|
|
struct sys_device *sys_dev;
|
|
|
|
sys_dev = get_cpu_sysdev(cpu);
|
|
switch (action) {
|
|
case CPU_ONLINE:
|
|
case CPU_ONLINE_FROZEN:
|
|
err_inject_add_dev(sys_dev);
|
|
break;
|
|
case CPU_DEAD:
|
|
case CPU_DEAD_FROZEN:
|
|
err_inject_remove_dev(sys_dev);
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block __cpuinitdata err_inject_cpu_notifier =
|
|
{
|
|
.notifier_call = err_inject_cpu_callback,
|
|
};
|
|
|
|
static int __init
|
|
err_inject_init(void)
|
|
{
|
|
int i;
|
|
|
|
#ifdef ERR_INJ_DEBUG
|
|
printk(KERN_INFO "Enter error injection driver.\n");
|
|
#endif
|
|
for_each_online_cpu(i) {
|
|
err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE,
|
|
(void *)(long)i);
|
|
}
|
|
|
|
register_hotcpu_notifier(&err_inject_cpu_notifier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
err_inject_exit(void)
|
|
{
|
|
int i;
|
|
struct sys_device *sys_dev;
|
|
|
|
#ifdef ERR_INJ_DEBUG
|
|
printk(KERN_INFO "Exit error injection driver.\n");
|
|
#endif
|
|
for_each_online_cpu(i) {
|
|
sys_dev = get_cpu_sysdev(i);
|
|
sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
|
|
}
|
|
unregister_hotcpu_notifier(&err_inject_cpu_notifier);
|
|
}
|
|
|
|
module_init(err_inject_init);
|
|
module_exit(err_inject_exit);
|
|
|
|
MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
|
|
MODULE_DESCRIPTION("MC error injection kernel sysfs interface");
|
|
MODULE_LICENSE("GPL");
|