EDAC, mce_amd_inj: Convert mce_amd_inj module to debugfs
This module's interface belongs in debugfs, not in sysfs. Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Borislav Petkov
parent
0a98babd85
commit
fd19fcd632
2 changed files with 94 additions and 118 deletions
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@ -61,14 +61,14 @@ config EDAC_DECODE_MCE
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has been initialized.
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config EDAC_MCE_INJ
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tristate "Simple MCE injection interface over /sysfs"
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depends on EDAC_DECODE_MCE
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tristate "Simple MCE injection interface"
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depends on EDAC_DECODE_MCE && DEBUG_FS
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default n
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help
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This is a simple interface to inject MCEs over /sysfs and test
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the MCE decoding code in EDAC.
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This is a simple debugfs interface to inject MCEs and test different
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aspects of the MCE handling code.
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This is currently AMD-only.
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WARNING: Do not even assume this interface is staying stable!
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config EDAC_MM_EDAC
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tristate "Main Memory EDAC (Error Detection And Correction) reporting"
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@ -1,173 +1,149 @@
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/*
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* A simple MCE injection facility for testing the MCE decoding code. This
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* driver should be built as module so that it can be loaded on production
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* kernels for testing purposes.
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* A simple MCE injection facility for testing different aspects of the RAS
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* code. This driver should be built as module so that it can be loaded
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* on production kernels for testing purposes.
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*
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* This file may be distributed under the terms of the GNU General Public
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* License version 2.
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*
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* Copyright (c) 2010: Borislav Petkov <bp@alien8.de>
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* Copyright (c) 2010-14: Borislav Petkov <bp@alien8.de>
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* Advanced Micro Devices Inc.
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*/
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#include <linux/kobject.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/edac.h>
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#include <linux/module.h>
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#include <asm/mce.h>
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#include "mce_amd.h"
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struct edac_mce_attr {
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struct attribute attr;
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ssize_t (*show) (struct kobject *kobj, struct edac_mce_attr *attr, char *buf);
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ssize_t (*store)(struct kobject *kobj, struct edac_mce_attr *attr,
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const char *buf, size_t count);
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};
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#define EDAC_MCE_ATTR(_name, _mode, _show, _store) \
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static struct edac_mce_attr mce_attr_##_name = __ATTR(_name, _mode, _show, _store)
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static struct kobject *mce_kobj;
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/*
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* Collect all the MCi_XXX settings
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*/
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static struct mce i_mce;
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static struct dentry *dfs_inj;
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#define MCE_INJECT_STORE(reg) \
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static ssize_t edac_inject_##reg##_store(struct kobject *kobj, \
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struct edac_mce_attr *attr, \
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const char *data, size_t count)\
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#define MCE_INJECT_SET(reg) \
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static int inj_##reg##_set(void *data, u64 val) \
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{ \
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int ret = 0; \
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unsigned long value; \
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struct mce *m = (struct mce *)data; \
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\
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ret = kstrtoul(data, 16, &value); \
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if (ret < 0) \
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printk(KERN_ERR "Error writing MCE " #reg " field.\n"); \
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\
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i_mce.reg = value; \
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\
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return count; \
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m->reg = val; \
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return 0; \
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}
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MCE_INJECT_STORE(status);
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MCE_INJECT_STORE(misc);
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MCE_INJECT_STORE(addr);
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MCE_INJECT_SET(status);
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MCE_INJECT_SET(misc);
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MCE_INJECT_SET(addr);
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#define MCE_INJECT_SHOW(reg) \
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static ssize_t edac_inject_##reg##_show(struct kobject *kobj, \
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struct edac_mce_attr *attr, \
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char *buf) \
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#define MCE_INJECT_GET(reg) \
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static int inj_##reg##_get(void *data, u64 *val) \
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{ \
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return sprintf(buf, "0x%016llx\n", i_mce.reg); \
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struct mce *m = (struct mce *)data; \
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\
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*val = m->reg; \
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return 0; \
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}
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MCE_INJECT_SHOW(status);
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MCE_INJECT_SHOW(misc);
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MCE_INJECT_SHOW(addr);
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MCE_INJECT_GET(status);
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MCE_INJECT_GET(misc);
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MCE_INJECT_GET(addr);
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EDAC_MCE_ATTR(status, 0644, edac_inject_status_show, edac_inject_status_store);
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EDAC_MCE_ATTR(misc, 0644, edac_inject_misc_show, edac_inject_misc_store);
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EDAC_MCE_ATTR(addr, 0644, edac_inject_addr_show, edac_inject_addr_store);
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DEFINE_SIMPLE_ATTRIBUTE(status_fops, inj_status_get, inj_status_set, "%llx\n");
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DEFINE_SIMPLE_ATTRIBUTE(misc_fops, inj_misc_get, inj_misc_set, "%llx\n");
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DEFINE_SIMPLE_ATTRIBUTE(addr_fops, inj_addr_get, inj_addr_set, "%llx\n");
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/*
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* This denotes into which bank we're injecting and triggers
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* the injection, at the same time.
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*/
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static ssize_t edac_inject_bank_store(struct kobject *kobj,
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struct edac_mce_attr *attr,
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const char *data, size_t count)
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static int inj_bank_set(void *data, u64 val)
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{
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int ret = 0;
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unsigned long value;
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struct mce *m = (struct mce *)data;
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ret = kstrtoul(data, 10, &value);
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if (ret < 0) {
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printk(KERN_ERR "Invalid bank value!\n");
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return -EINVAL;
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}
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if (value > 5)
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if (boot_cpu_data.x86 != 0x15 || value > 6) {
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printk(KERN_ERR "Non-existent MCE bank: %lu\n", value);
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if (val > 5) {
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if (boot_cpu_data.x86 != 0x15 || val > 6) {
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pr_err("Non-existent MCE bank: %llu\n", val);
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return -EINVAL;
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}
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}
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i_mce.bank = value;
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m->bank = val;
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amd_decode_mce(NULL, 0, &i_mce);
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amd_decode_mce(NULL, 0, m);
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return count;
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return 0;
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}
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static ssize_t edac_inject_bank_show(struct kobject *kobj,
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struct edac_mce_attr *attr, char *buf)
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static int inj_bank_get(void *data, u64 *val)
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{
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return sprintf(buf, "%d\n", i_mce.bank);
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struct mce *m = (struct mce *)data;
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*val = m->bank;
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return 0;
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}
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EDAC_MCE_ATTR(bank, 0644, edac_inject_bank_show, edac_inject_bank_store);
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DEFINE_SIMPLE_ATTRIBUTE(bank_fops, inj_bank_get, inj_bank_set, "%llu\n");
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static struct edac_mce_attr *sysfs_attrs[] = { &mce_attr_status, &mce_attr_misc,
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&mce_attr_addr, &mce_attr_bank
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struct dfs_node {
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char *name;
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struct dentry *d;
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const struct file_operations *fops;
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} dfs_fls[] = {
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{ .name = "status", .fops = &status_fops },
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{ .name = "misc", .fops = &misc_fops },
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{ .name = "addr", .fops = &addr_fops },
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{ .name = "bank", .fops = &bank_fops },
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};
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static int __init edac_init_mce_inject(void)
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{
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struct bus_type *edac_subsys = NULL;
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int i, err = 0;
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edac_subsys = edac_get_sysfs_subsys();
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if (!edac_subsys)
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return -EINVAL;
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mce_kobj = kobject_create_and_add("mce", &edac_subsys->dev_root->kobj);
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if (!mce_kobj) {
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printk(KERN_ERR "Error creating a mce kset.\n");
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err = -ENOMEM;
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goto err_mce_kobj;
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}
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for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++) {
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err = sysfs_create_file(mce_kobj, &sysfs_attrs[i]->attr);
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if (err) {
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printk(KERN_ERR "Error creating %s in sysfs.\n",
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sysfs_attrs[i]->attr.name);
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goto err_sysfs_create;
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}
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}
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return 0;
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err_sysfs_create:
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while (--i >= 0)
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sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
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kobject_del(mce_kobj);
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err_mce_kobj:
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edac_put_sysfs_subsys();
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return err;
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}
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static void __exit edac_exit_mce_inject(void)
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static int __init init_mce_inject(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++)
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sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
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dfs_inj = debugfs_create_dir("mce-inject", NULL);
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if (!dfs_inj)
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return -EINVAL;
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kobject_del(mce_kobj);
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for (i = 0; i < ARRAY_SIZE(dfs_fls); i++) {
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dfs_fls[i].d = debugfs_create_file(dfs_fls[i].name,
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S_IRUSR | S_IWUSR,
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dfs_inj,
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&i_mce,
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dfs_fls[i].fops);
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edac_put_sysfs_subsys();
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if (!dfs_fls[i].d)
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goto err_dfs_add;
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}
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return 0;
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err_dfs_add:
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while (--i >= 0)
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debugfs_remove(dfs_fls[i].d);
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debugfs_remove(dfs_inj);
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dfs_inj = NULL;
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return -ENOMEM;
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}
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module_init(edac_init_mce_inject);
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module_exit(edac_exit_mce_inject);
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static void __exit exit_mce_inject(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(dfs_fls); i++)
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debugfs_remove(dfs_fls[i].d);
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memset(&dfs_fls, 0, sizeof(dfs_fls));
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debugfs_remove(dfs_inj);
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dfs_inj = NULL;
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}
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module_init(init_mce_inject);
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module_exit(exit_mce_inject);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Borislav Petkov <bp@alien8.de>");
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MODULE_AUTHOR("AMD Inc.");
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MODULE_DESCRIPTION("MCE injection facility for testing MCE decoding");
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MODULE_DESCRIPTION("MCE injection facility for RAS testing");
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