1 // SPDX-License-Identifier: GPL-2.0-or-later
29  * loading failures to enable improvements either for kernel module auto-loading
64  * DOC: dup_failed_modules - tracks duplicate failed modules
77  * In practice on a typical boot today most finit_module() calls fail due to
90  *	- with module decompression: 2 virtual memory allocation calls
91  *	- without module decompression: 1 virtual memory allocation calls
93  *   	- with module decompression 3 virtual memory allocation calls
94  *   	- without module decompression 2 virtual memory allocation calls
98  * either in-kernel or in userspace.
134  *     reason for this failure is when userspace is racing to load a module
141  *     duplicate failed modules are non-fatal, however they typically are
145  *     non-fatal, we should try to reduce vmalloc() pressure proactively, so
146  *     ideally after boot this will be close to as 0 as possible.  If module
153  *    * module_sig_check() - module signature checks
154  *    * elf_validity_cache_copy() - some ELF validation issue
210 	if (test_bit(FAIL_DUP_MOD_BECOMING, &mod_fail->dup_fail_mask) &&  in mod_fail_to_str()
211 	    test_bit(FAIL_DUP_MOD_LOAD, &mod_fail->dup_fail_mask))  in mod_fail_to_str()
213 	if (test_bit(FAIL_DUP_MOD_BECOMING, &mod_fail->dup_fail_mask))  in mod_fail_to_str()
215 	if (test_bit(FAIL_DUP_MOD_LOAD, &mod_fail->dup_fail_mask))  in mod_fail_to_str()
217 	return "Bug-on-stats";  in mod_fail_to_str()
222 	atomic_long_add(info->len * 2, &invalid_mod_bytes);  in mod_stat_bump_invalid()
226 		atomic_long_add(info->compressed_len, &invalid_mod_bytes);  in mod_stat_bump_invalid()
233 	atomic_long_add(info->len, &invalid_becoming_bytes);  in mod_stat_bump_becoming()
236 		atomic_long_add(info->compressed_len, &invalid_becoming_bytes);  in mod_stat_bump_becoming()
240 int try_add_failed_module(const char *name, enum fail_dup_mod_reason reason)  in try_add_failed_module()  argument
246 		if (!strcmp(mod_fail->name, name)) {  in try_add_failed_module()
247 			atomic_long_inc(&mod_fail->count);  in try_add_failed_module()
248 			__set_bit(reason, &mod_fail->dup_fail_mask);  in try_add_failed_module()
255 		return -ENOMEM;  in try_add_failed_module()
256 	memcpy(mod_fail->name, name, strlen(name));  in try_add_failed_module()
257 	__set_bit(reason, &mod_fail->dup_fail_mask);  in try_add_failed_module()
258 	atomic_long_inc(&mod_fail->count);  in try_add_failed_module()
259 	list_add_rcu(&mod_fail->list, &dup_failed_modules);  in try_add_failed_module()
303 		return -ENOMEM;  in read_file_mod_stats()
308 	len += scnprintf(buf + len, size - len, "%25s\t%u\n", "Mods failed on kread", fkreads);  in read_file_mod_stats()
310 	len += scnprintf(buf + len, size - len, "%25s\t%u\n", "Mods failed on decompress",  in read_file_mod_stats()
312 	len += scnprintf(buf + len, size - len, "%25s\t%u\n", "Mods failed on becoming", fbecoming);  in read_file_mod_stats()
314 	len += scnprintf(buf + len, size - len, "%25s\t%u\n", "Mods failed on load", floads);  in read_file_mod_stats()
316 	len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Total module size", total_size);  in read_file_mod_stats()
317 	len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Total mod text size", text_size);  in read_file_mod_stats()
319 	len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Failed kread bytes", ikread_bytes);  in read_file_mod_stats()
321 	len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Failed decompress bytes",  in read_file_mod_stats()
324 	len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Failed becoming bytes", ibecoming_bytes);  in read_file_mod_stats()
326 	len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Failed kmod bytes", imod_bytes);  in read_file_mod_stats()
328 …len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Virtual mem wasted bytes", total_virtual_l…  in read_file_mod_stats()
331 		len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Average mod size",  in read_file_mod_stats()
336 		len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Average mod text size",  in read_file_mod_stats()
349 		len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Avg fail kread bytes",  in read_file_mod_stats()
355 		len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Avg fail becoming bytes",  in read_file_mod_stats()
361 		len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Avg fail decomp bytes",  in read_file_mod_stats()
367 		len += scnprintf(buf + len, size - len, "%25s\t%lu\n", "Average fail load bytes",  in read_file_mod_stats()
379 	len += scnprintf(buf + len, size - len, "Duplicate failed modules:\n");  in read_file_mod_stats()
380 	len += scnprintf(buf + len, size - len, "%25s\t%15s\t%25s\n",  in read_file_mod_stats()
381 			 "Module-name", "How-many-times", "Reason");  in read_file_mod_stats()
388 		len += scnprintf(buf + len, size - len, "%25s\t%15lu\t%25s\n", mod_fail->name,  in read_file_mod_stats()
389 				 atomic_long_read(&mod_fail->count), mod_fail_to_str(mod_fail));  in read_file_mod_stats()