LXR linux/arch/ia64/kernel/err

   1/*
   2 * err_inject.c -
   3 *      1.) Inject errors to a processor.
   4 *      2.) Query error injection capabilities.
   5 * This driver along with user space code can be acting as an error
   6 * injection tool.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  16 * NON INFRINGEMENT.  See the GNU General Public License for more
  17 * details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 *
  23 * Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation
  24 * Copyright (C) 2006, Intel Corp.  All rights reserved.
  25 *
  26 */
  27#include <linux/device.h>
  28#include <linux/init.h>
  29#include <linux/mm.h>
  30#include <linux/cpu.h>
  31#include <linux/module.h>
  32
  33#define ERR_INJ_DEBUG
  34
  35#define ERR_DATA_BUFFER_SIZE 3          // Three 8-byte;
  36
  37#define define_one_ro(name)                                             \
  38static DEVICE_ATTR(name, 0444, show_##name, NULL)
  39
  40#define define_one_rw(name)                                             \
  41static DEVICE_ATTR(name, 0644, show_##name, store_##name)
  42
  43static u64 call_start[NR_CPUS];
  44static u64 phys_addr[NR_CPUS];
  45static u64 err_type_info[NR_CPUS];
  46static u64 err_struct_info[NR_CPUS];
  47static struct {
  48        u64 data1;
  49        u64 data2;
  50        u64 data3;
  51} __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS];
  52static s64 status[NR_CPUS];
  53static u64 capabilities[NR_CPUS];
  54static u64 resources[NR_CPUS];
  55
  56#define show(name)                                                      \
  57static ssize_t                                                          \
  58show_##name(struct device *dev, struct device_attribute *attr,  \
  59                char *buf)                                              \
  60{                                                                       \
  61        u32 cpu=dev->id;                                                \
  62        return sprintf(buf, "%lx\n", name[cpu]);                        \
  63}
  64
  65#define store(name)                                                     \
  66static ssize_t                                                          \
  67store_##name(struct device *dev, struct device_attribute *attr, \
  68                                        const char *buf, size_t size)   \
  69{                                                                       \
  70        unsigned int cpu=dev->id;                                       \
  71        name[cpu] = simple_strtoull(buf, NULL, 16);                     \
  72        return size;                                                    \
  73}
  74
  75show(call_start)
  76
  77/* It's user's responsibility to call the PAL procedure on a specific
  78 * processor. The cpu number in driver is only used for storing data.
  79 */
  80static ssize_t
  81store_call_start(struct device *dev, struct device_attribute *attr,
  82                const char *buf, size_t size)
  83{
  84        unsigned int cpu=dev->id;
  85        unsigned long call_start = simple_strtoull(buf, NULL, 16);
  86
  87#ifdef ERR_INJ_DEBUG
  88        printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu);
  89        printk(KERN_DEBUG "err_type_info=%lx,\n", err_type_info[cpu]);
  90        printk(KERN_DEBUG "err_struct_info=%lx,\n", err_struct_info[cpu]);
  91        printk(KERN_DEBUG "err_data_buffer=%lx, %lx, %lx.\n",
  92                          err_data_buffer[cpu].data1,
  93                          err_data_buffer[cpu].data2,
  94                          err_data_buffer[cpu].data3);
  95#endif
  96        switch (call_start) {
  97            case 0: /* Do nothing. */
  98                break;
  99            case 1: /* Call pal_mc_error_inject in physical mode. */
 100                status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu],
 101                                        err_struct_info[cpu],
 102                                        ia64_tpa(&err_data_buffer[cpu]),
 103                                        &capabilities[cpu],
 104                                        &resources[cpu]);
 105                break;
 106            case 2: /* Call pal_mc_error_inject in virtual mode. */
 107                status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu],
 108                                        err_struct_info[cpu],
 109                                        ia64_tpa(&err_data_buffer[cpu]),
 110                                        &capabilities[cpu],
 111                                        &resources[cpu]);
 112                break;
 113            default:
 114                status[cpu] = -EINVAL;
 115                break;
 116        }
 117
 118#ifdef ERR_INJ_DEBUG
 119        printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]);
 120        printk(KERN_DEBUG "capabilities=%lx,\n", capabilities[cpu]);
 121        printk(KERN_DEBUG "resources=%lx\n", resources[cpu]);
 122#endif
 123        return size;
 124}
 125
 126show(err_type_info)
 127store(err_type_info)
 128
 129static ssize_t
 130show_virtual_to_phys(struct device *dev, struct device_attribute *attr,
 131                        char *buf)
 132{
 133        unsigned int cpu=dev->id;
 134        return sprintf(buf, "%lx\n", phys_addr[cpu]);
 135}
 136
 137static ssize_t
 138store_virtual_to_phys(struct device *dev, struct device_attribute *attr,
 139                        const char *buf, size_t size)
 140{
 141        unsigned int cpu=dev->id;
 142        u64 virt_addr=simple_strtoull(buf, NULL, 16);
 143        int ret;
 144
 145        ret = get_user_pages_fast(virt_addr, 1, FOLL_WRITE, NULL);
 146        if (ret<=0) {
 147#ifdef ERR_INJ_DEBUG
 148                printk("Virtual address %lx is not existing.\n",virt_addr);
 149#endif
 150                return -EINVAL;
 151        }
 152
 153        phys_addr[cpu] = ia64_tpa(virt_addr);
 154        return size;
 155}
 156
 157show(err_struct_info)
 158store(err_struct_info)
 159
 160static ssize_t
 161show_err_data_buffer(struct device *dev,
 162                        struct device_attribute *attr, char *buf)
 163{
 164        unsigned int cpu=dev->id;
 165
 166        return sprintf(buf, "%lx, %lx, %lx\n",
 167                        err_data_buffer[cpu].data1,
 168                        err_data_buffer[cpu].data2,
 169                        err_data_buffer[cpu].data3);
 170}
 171
 172static ssize_t
 173store_err_data_buffer(struct device *dev,
 174                        struct device_attribute *attr,
 175                        const char *buf, size_t size)
 176{
 177        unsigned int cpu=dev->id;
 178        int ret;
 179
 180#ifdef ERR_INJ_DEBUG
 181        printk("write err_data_buffer=[%lx,%lx,%lx] on cpu%d\n",
 182                 err_data_buffer[cpu].data1,
 183                 err_data_buffer[cpu].data2,
 184                 err_data_buffer[cpu].data3,
 185                 cpu);
 186#endif
 187        ret=sscanf(buf, "%lx, %lx, %lx",
 188                        &err_data_buffer[cpu].data1,
 189                        &err_data_buffer[cpu].data2,
 190                        &err_data_buffer[cpu].data3);
 191        if (ret!=ERR_DATA_BUFFER_SIZE)
 192                return -EINVAL;
 193
 194        return size;
 195}
 196
 197show(status)
 198show(capabilities)
 199show(resources)
 200
 201define_one_rw(call_start);
 202define_one_rw(err_type_info);
 203define_one_rw(err_struct_info);
 204define_one_rw(err_data_buffer);
 205define_one_rw(virtual_to_phys);
 206define_one_ro(status);
 207define_one_ro(capabilities);
 208define_one_ro(resources);
 209
 210static struct attribute *default_attrs[] = {
 211        &dev_attr_call_start.attr,
 212        &dev_attr_virtual_to_phys.attr,
 213        &dev_attr_err_type_info.attr,
 214        &dev_attr_err_struct_info.attr,
 215        &dev_attr_err_data_buffer.attr,
 216        &dev_attr_status.attr,
 217        &dev_attr_capabilities.attr,
 218        &dev_attr_resources.attr,
 219        NULL
 220};
 221
 222static struct attribute_group err_inject_attr_group = {
 223        .attrs = default_attrs,
 224        .name = "err_inject"
 225};
 226/* Add/Remove err_inject interface for CPU device */
 227static int err_inject_add_dev(unsigned int cpu)
 228{
 229        struct device *sys_dev = get_cpu_device(cpu);
 230
 231        return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group);
 232}
 233
 234static int err_inject_remove_dev(unsigned int cpu)
 235{
 236        struct device *sys_dev = get_cpu_device(cpu);
 237
 238        sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
 239        return 0;
 240}
 241
 242static enum cpuhp_state hp_online;
 243
 244static int __init err_inject_init(void)
 245{
 246        int ret;
 247#ifdef ERR_INJ_DEBUG
 248        printk(KERN_INFO "Enter error injection driver.\n");
 249#endif
 250
 251        ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/err_inj:online",
 252                                err_inject_add_dev, err_inject_remove_dev);
 253        if (ret >= 0) {
 254                hp_online = ret;
 255                ret = 0;
 256        }
 257        return ret;
 258}
 259
 260static void __exit err_inject_exit(void)
 261{
 262#ifdef ERR_INJ_DEBUG
 263        printk(KERN_INFO "Exit error injection driver.\n");
 264#endif
 265        cpuhp_remove_state(hp_online);
 266}
 267
 268module_init(err_inject_init);
 269module_exit(err_inject_exit);
 270
 271MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
 272MODULE_DESCRIPTION("MC error injection kernel sysfs interface");
 273MODULE_LICENSE("GPL");
 274