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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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cae681fc12
Useful for some testing scenarios, although specific testing is often done better through MADV_POISON This can be done with the x86 level MCE injector too, but this interface allows it to do independently from low level x86 changes. v2: Add module license (Haicheng Li) Signed-off-by: Andi Kleen <ak@linux.intel.com>
42 lines
988 B
C
42 lines
988 B
C
/* Inject a hwpoison memory failure on a arbitary pfn */
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#include <linux/module.h>
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#include <linux/debugfs.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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static struct dentry *hwpoison_dir, *corrupt_pfn;
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static int hwpoison_inject(void *data, u64 val)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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printk(KERN_INFO "Injecting memory failure at pfn %Lx\n", val);
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return __memory_failure(val, 18, 0);
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}
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DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
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static void pfn_inject_exit(void)
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{
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if (hwpoison_dir)
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debugfs_remove_recursive(hwpoison_dir);
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}
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static int pfn_inject_init(void)
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{
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hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
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if (hwpoison_dir == NULL)
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return -ENOMEM;
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corrupt_pfn = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir,
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NULL, &hwpoison_fops);
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if (corrupt_pfn == NULL) {
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pfn_inject_exit();
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return -ENOMEM;
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}
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return 0;
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}
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module_init(pfn_inject_init);
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module_exit(pfn_inject_exit);
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MODULE_LICENSE("GPL");
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