Merge branch 'master' into tk71

[mv-sheeva.git] / drivers / edac / mce_amd_inj.c

diff --git a/drivers/edac/mce_amd_inj.c b/drivers/edac/mce_amd_inj.c
new file mode 100644 (file)
index 0000000..733a7e7
--- /dev/null
+++ b/drivers/edac/mce_amd_inj.c
@@ -0,0 +1,172 @@
+/*
+ * 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 "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)
+               if (boot_cpu_data.x86 != 0x15 || value > 6) {
+                       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");