1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/fault-inject.h>
3*4882a593Smuzhiyun #include <linux/slab.h>
4*4882a593Smuzhiyun #include <linux/mm.h>
5*4882a593Smuzhiyun #include "slab.h"
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun static struct {
8*4882a593Smuzhiyun struct fault_attr attr;
9*4882a593Smuzhiyun bool ignore_gfp_reclaim;
10*4882a593Smuzhiyun bool cache_filter;
11*4882a593Smuzhiyun } failslab = {
12*4882a593Smuzhiyun .attr = FAULT_ATTR_INITIALIZER,
13*4882a593Smuzhiyun .ignore_gfp_reclaim = true,
14*4882a593Smuzhiyun .cache_filter = false,
15*4882a593Smuzhiyun };
16*4882a593Smuzhiyun
__should_failslab(struct kmem_cache * s,gfp_t gfpflags)17*4882a593Smuzhiyun bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun /* No fault-injection for bootstrap cache */
20*4882a593Smuzhiyun if (unlikely(s == kmem_cache))
21*4882a593Smuzhiyun return false;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun if (gfpflags & __GFP_NOFAIL)
24*4882a593Smuzhiyun return false;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun if (failslab.ignore_gfp_reclaim &&
27*4882a593Smuzhiyun (gfpflags & __GFP_DIRECT_RECLAIM))
28*4882a593Smuzhiyun return false;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))
31*4882a593Smuzhiyun return false;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun return should_fail(&failslab.attr, s->object_size);
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
setup_failslab(char * str)36*4882a593Smuzhiyun static int __init setup_failslab(char *str)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun return setup_fault_attr(&failslab.attr, str);
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun __setup("failslab=", setup_failslab);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
failslab_debugfs_init(void)43*4882a593Smuzhiyun static int __init failslab_debugfs_init(void)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun struct dentry *dir;
46*4882a593Smuzhiyun umode_t mode = S_IFREG | 0600;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
49*4882a593Smuzhiyun if (IS_ERR(dir))
50*4882a593Smuzhiyun return PTR_ERR(dir);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun debugfs_create_bool("ignore-gfp-wait", mode, dir,
53*4882a593Smuzhiyun &failslab.ignore_gfp_reclaim);
54*4882a593Smuzhiyun debugfs_create_bool("cache-filter", mode, dir,
55*4882a593Smuzhiyun &failslab.cache_filter);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun return 0;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun late_initcall(failslab_debugfs_init);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
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