Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/fault-inject.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include "slab.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) static struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 	struct fault_attr attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	bool ignore_gfp_reclaim;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	bool cache_filter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) } failslab = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	.attr = FAULT_ATTR_INITIALIZER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	.ignore_gfp_reclaim = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	.cache_filter = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	/* No fault-injection for bootstrap cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	if (unlikely(s == kmem_cache))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	if (gfpflags & __GFP_NOFAIL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	if (failslab.ignore_gfp_reclaim &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 			(gfpflags & __GFP_DIRECT_RECLAIM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	return should_fail(&failslab.attr, s->object_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static int __init setup_failslab(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	return setup_fault_attr(&failslab.attr, str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) __setup("failslab=", setup_failslab);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static int __init failslab_debugfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	struct dentry *dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	umode_t mode = S_IFREG | 0600;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	if (IS_ERR(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		return PTR_ERR(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	debugfs_create_bool("ignore-gfp-wait", mode, dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 			    &failslab.ignore_gfp_reclaim);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	debugfs_create_bool("cache-filter", mode, dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 			    &failslab.cache_filter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) late_initcall(failslab_debugfs_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */