HWPOISON: Add simple debugfs interface to inject hwpoison on arbitary PFNs
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>hifive-unleashed-5.1
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@ -243,6 +243,10 @@ config MEMORY_FAILURE
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even when some of its memory has uncorrected errors. This requires
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even when some of its memory has uncorrected errors. This requires
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special hardware support and typically ECC memory.
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special hardware support and typically ECC memory.
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config HWPOISON_INJECT
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tristate "Poison pages injector"
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depends on MEMORY_FAILURE && DEBUG_KERNEL
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config NOMMU_INITIAL_TRIM_EXCESS
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config NOMMU_INITIAL_TRIM_EXCESS
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int "Turn on mmap() excess space trimming before booting"
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int "Turn on mmap() excess space trimming before booting"
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depends on !MMU
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depends on !MMU
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@ -41,5 +41,6 @@ endif
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obj-$(CONFIG_QUICKLIST) += quicklist.o
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obj-$(CONFIG_QUICKLIST) += quicklist.o
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obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
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obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
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obj-$(CONFIG_MEMORY_FAILURE) += memory-failure.o
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obj-$(CONFIG_MEMORY_FAILURE) += memory-failure.o
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obj-$(CONFIG_HWPOISON_INJECT) += hwpoison-inject.o
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obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o
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obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o
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obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o
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obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o
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@ -0,0 +1,41 @@
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/* 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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