diff options
author | 2015-08-04 12:17:53 -0700 | |
---|---|---|
committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/mm/hwpoison-inject.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/mm/hwpoison-inject.c')
-rw-r--r-- | kernel/mm/hwpoison-inject.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/kernel/mm/hwpoison-inject.c b/kernel/mm/hwpoison-inject.c new file mode 100644 index 000000000..4ca5fe004 --- /dev/null +++ b/kernel/mm/hwpoison-inject.c @@ -0,0 +1,144 @@ +/* Inject a hwpoison memory failure on a arbitrary pfn */ +#include <linux/module.h> +#include <linux/debugfs.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/pagemap.h> +#include <linux/hugetlb.h> +#include "internal.h" + +static struct dentry *hwpoison_dir; + +static int hwpoison_inject(void *data, u64 val) +{ + unsigned long pfn = val; + struct page *p; + struct page *hpage; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (!pfn_valid(pfn)) + return -ENXIO; + + p = pfn_to_page(pfn); + hpage = compound_head(p); + /* + * This implies unable to support free buddy pages. + */ + if (!get_page_unless_zero(hpage)) + return 0; + + if (!hwpoison_filter_enable) + goto inject; + + if (!PageLRU(hpage) && !PageHuge(p)) + shake_page(hpage, 0); + /* + * This implies unable to support non-LRU pages. + */ + if (!PageLRU(hpage) && !PageHuge(p)) + goto put_out; + + /* + * do a racy check with elevated page count, to make sure PG_hwpoison + * will only be set for the targeted owner (or on a free page). + * We temporarily take page lock for try_get_mem_cgroup_from_page(). + * memory_failure() will redo the check reliably inside page lock. + */ + lock_page(hpage); + err = hwpoison_filter(hpage); + unlock_page(hpage); + if (err) + goto put_out; + +inject: + pr_info("Injecting memory failure at pfn %#lx\n", pfn); + return memory_failure(pfn, 18, MF_COUNT_INCREASED); +put_out: + put_page(hpage); + return 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) +{ + debugfs_remove_recursive(hwpoison_dir); +} + +static int pfn_inject_init(void) +{ + struct dentry *dentry; + + hwpoison_dir = debugfs_create_dir("hwpoison", NULL); + if (hwpoison_dir == NULL) + return -ENOMEM; + + /* + * 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", 0200, hwpoison_dir, + NULL, &hwpoison_fops); + if (!dentry) + goto fail; + + dentry = debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir, + NULL, &unpoison_fops); + if (!dentry) + goto fail; + + dentry = debugfs_create_u32("corrupt-filter-enable", 0600, + hwpoison_dir, &hwpoison_filter_enable); + if (!dentry) + goto fail; + + dentry = debugfs_create_u32("corrupt-filter-dev-major", 0600, + hwpoison_dir, &hwpoison_filter_dev_major); + if (!dentry) + goto fail; + + dentry = debugfs_create_u32("corrupt-filter-dev-minor", 0600, + hwpoison_dir, &hwpoison_filter_dev_minor); + if (!dentry) + goto fail; + + dentry = debugfs_create_u64("corrupt-filter-flags-mask", 0600, + hwpoison_dir, &hwpoison_filter_flags_mask); + if (!dentry) + goto fail; + + dentry = debugfs_create_u64("corrupt-filter-flags-value", 0600, + hwpoison_dir, &hwpoison_filter_flags_value); + if (!dentry) + goto fail; + +#ifdef CONFIG_MEMCG_SWAP + dentry = debugfs_create_u64("corrupt-filter-memcg", 0600, + hwpoison_dir, &hwpoison_filter_memcg); + if (!dentry) + goto fail; +#endif + + return 0; +fail: + pfn_inject_exit(); + return -ENOMEM; +} + +module_init(pfn_inject_init); +module_exit(pfn_inject_exit); +MODULE_LICENSE("GPL"); |