diff options
Diffstat (limited to 'mm/hwpoison-inject.c')
| -rw-r--r-- | mm/hwpoison-inject.c | 36 |
1 files changed, 30 insertions, 6 deletions
diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c index e1d85137f086..6e35e563bf50 100644 --- a/mm/hwpoison-inject.c +++ b/mm/hwpoison-inject.c @@ -4,7 +4,7 @@ #include <linux/kernel.h> #include <linux/mm.h> -static struct dentry *hwpoison_dir, *corrupt_pfn; +static struct dentry *hwpoison_dir; static int hwpoison_inject(void *data, u64 val) { @@ -14,7 +14,16 @@ static int hwpoison_inject(void *data, u64 val) return __memory_failure(val, 18, 0); } +static int hwpoison_unpoison(void *data, u64 val) +{ + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + return unpoison_memory(val); +} + DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n"); +DEFINE_SIMPLE_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n"); static void pfn_inject_exit(void) { @@ -24,16 +33,31 @@ static void pfn_inject_exit(void) static int pfn_inject_init(void) { + struct dentry *dentry; + hwpoison_dir = debugfs_create_dir("hwpoison", NULL); if (hwpoison_dir == NULL) return -ENOMEM; - corrupt_pfn = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir, + + /* + * Note that the below poison/unpoison interfaces do not involve + * hardware status change, hence do not require hardware support. + * They are mainly for testing hwpoison in software level. + */ + dentry = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir, NULL, &hwpoison_fops); - if (corrupt_pfn == NULL) { - pfn_inject_exit(); - return -ENOMEM; - } + if (!dentry) + goto fail; + + dentry = debugfs_create_file("unpoison-pfn", 0600, hwpoison_dir, + NULL, &unpoison_fops); + if (!dentry) + goto fail; + return 0; +fail: + pfn_inject_exit(); + return -ENOMEM; } module_init(pfn_inject_init); |