diff options
Diffstat (limited to 'drivers/edac/mce_amd_inj.c')
| -rw-r--r-- | drivers/edac/mce_amd_inj.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/edac/mce_amd_inj.c b/drivers/edac/mce_amd_inj.c new file mode 100644 index 000000000000..0e4f2dcf3bd6 --- /dev/null +++ b/drivers/edac/mce_amd_inj.c @@ -0,0 +1,171 @@ +/* + * A simple MCE injection facility for testing the MCE decoding code. This + * driver should be built as module so that it can be loaded on production + * kernels for testing purposes. + * + * This file may be distributed under the terms of the GNU General Public + * License version 2. + * + * Copyright (c) 2010: Borislav Petkov <borislav.petkov@amd.com> + * Advanced Micro Devices Inc. + */ + +#include <linux/kobject.h> +#include <linux/sysdev.h> +#include <linux/edac.h> +#include <asm/mce.h> + +#include "edac_mce_amd.h" + +struct edac_mce_attr { + struct attribute attr; + ssize_t (*show) (struct kobject *kobj, struct edac_mce_attr *attr, char *buf); + ssize_t (*store)(struct kobject *kobj, struct edac_mce_attr *attr, + const char *buf, size_t count); +}; + +#define EDAC_MCE_ATTR(_name, _mode, _show, _store) \ +static struct edac_mce_attr mce_attr_##_name = __ATTR(_name, _mode, _show, _store) + +static struct kobject *mce_kobj; + +/* + * Collect all the MCi_XXX settings + */ +static struct mce i_mce; + +#define MCE_INJECT_STORE(reg) \ +static ssize_t edac_inject_##reg##_store(struct kobject *kobj, \ + struct edac_mce_attr *attr, \ + const char *data, size_t count)\ +{ \ + int ret = 0; \ + unsigned long value; \ + \ + ret = strict_strtoul(data, 16, &value); \ + if (ret < 0) \ + printk(KERN_ERR "Error writing MCE " #reg " field.\n"); \ + \ + i_mce.reg = value; \ + \ + return count; \ +} + +MCE_INJECT_STORE(status); +MCE_INJECT_STORE(misc); +MCE_INJECT_STORE(addr); + +#define MCE_INJECT_SHOW(reg) \ +static ssize_t edac_inject_##reg##_show(struct kobject *kobj, \ + struct edac_mce_attr *attr, \ + char *buf) \ +{ \ + return sprintf(buf, "0x%016llx\n", i_mce.reg); \ +} + +MCE_INJECT_SHOW(status); +MCE_INJECT_SHOW(misc); +MCE_INJECT_SHOW(addr); + +EDAC_MCE_ATTR(status, 0644, edac_inject_status_show, edac_inject_status_store); +EDAC_MCE_ATTR(misc, 0644, edac_inject_misc_show, edac_inject_misc_store); +EDAC_MCE_ATTR(addr, 0644, edac_inject_addr_show, edac_inject_addr_store); + +/* + * This denotes into which bank we're injecting and triggers + * the injection, at the same time. + */ +static ssize_t edac_inject_bank_store(struct kobject *kobj, + struct edac_mce_attr *attr, + const char *data, size_t count) +{ + int ret = 0; + unsigned long value; + + ret = strict_strtoul(data, 10, &value); + if (ret < 0) { + printk(KERN_ERR "Invalid bank value!\n"); + return -EINVAL; + } + + if (value > 5) { + printk(KERN_ERR "Non-existant MCE bank: %lu\n", value); + return -EINVAL; + } + + i_mce.bank = value; + + amd_decode_mce(NULL, 0, &i_mce); + + return count; +} + +static ssize_t edac_inject_bank_show(struct kobject *kobj, + struct edac_mce_attr *attr, char *buf) +{ + return sprintf(buf, "%d\n", i_mce.bank); +} + +EDAC_MCE_ATTR(bank, 0644, edac_inject_bank_show, edac_inject_bank_store); + +static struct edac_mce_attr *sysfs_attrs[] = { &mce_attr_status, &mce_attr_misc, + &mce_attr_addr, &mce_attr_bank +}; + +static int __init edac_init_mce_inject(void) +{ + struct sysdev_class *edac_class = NULL; + int i, err = 0; + + edac_class = edac_get_sysfs_class(); + if (!edac_class) + return -EINVAL; + + mce_kobj = kobject_create_and_add("mce", &edac_class->kset.kobj); + if (!mce_kobj) { + printk(KERN_ERR "Error creating a mce kset.\n"); + err = -ENOMEM; + goto err_mce_kobj; + } + + for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++) { + err = sysfs_create_file(mce_kobj, &sysfs_attrs[i]->attr); + if (err) { + printk(KERN_ERR "Error creating %s in sysfs.\n", + sysfs_attrs[i]->attr.name); + goto err_sysfs_create; + } + } + return 0; + +err_sysfs_create: + while (i-- >= 0) + sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr); + + kobject_del(mce_kobj); + +err_mce_kobj: + edac_put_sysfs_class(); + + return err; +} + +static void __exit edac_exit_mce_inject(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++) + sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr); + + kobject_del(mce_kobj); + + edac_put_sysfs_class(); +} + +module_init(edac_init_mce_inject); +module_exit(edac_exit_mce_inject); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Borislav Petkov <borislav.petkov@amd.com>"); +MODULE_AUTHOR("AMD Inc."); +MODULE_DESCRIPTION("MCE injection facility for testing MCE decoding"); |