1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
26ff1cb35SAkinobu Mita #include <linux/kernel.h>
36ff1cb35SAkinobu Mita #include <linux/init.h>
46ff1cb35SAkinobu Mita #include <linux/random.h>
5d43c36dcSAlexey Dobriyan #include <linux/sched.h>
66ff1cb35SAkinobu Mita #include <linux/stat.h>
76ff1cb35SAkinobu Mita #include <linux/types.h>
86ff1cb35SAkinobu Mita #include <linux/fs.h>
98bc3bcc9SPaul Gortmaker #include <linux/export.h>
10f4f154fdSAkinobu Mita #include <linux/interrupt.h>
11329409aeSAkinobu Mita #include <linux/stacktrace.h>
126ff1cb35SAkinobu Mita #include <linux/fault-inject.h>
136ff1cb35SAkinobu Mita
146ff1cb35SAkinobu Mita /*
156ff1cb35SAkinobu Mita * setup_fault_attr() is a helper function for various __setup handlers, so it
166ff1cb35SAkinobu Mita * returns 0 on error, because that is what __setup handlers do.
176ff1cb35SAkinobu Mita */
setup_fault_attr(struct fault_attr * attr,char * str)186cba00eaSPer Forlin int setup_fault_attr(struct fault_attr *attr, char *str)
196ff1cb35SAkinobu Mita {
206ff1cb35SAkinobu Mita unsigned long probability;
216ff1cb35SAkinobu Mita unsigned long interval;
226ff1cb35SAkinobu Mita int times;
236ff1cb35SAkinobu Mita int space;
246ff1cb35SAkinobu Mita
256ff1cb35SAkinobu Mita /* "<interval>,<probability>,<space>,<times>" */
266ff1cb35SAkinobu Mita if (sscanf(str, "%lu,%lu,%d,%d",
276ff1cb35SAkinobu Mita &interval, &probability, &space, ×) < 4) {
286ff1cb35SAkinobu Mita printk(KERN_WARNING
296ff1cb35SAkinobu Mita "FAULT_INJECTION: failed to parse arguments\n");
306ff1cb35SAkinobu Mita return 0;
316ff1cb35SAkinobu Mita }
326ff1cb35SAkinobu Mita
336ff1cb35SAkinobu Mita attr->probability = probability;
346ff1cb35SAkinobu Mita attr->interval = interval;
356ff1cb35SAkinobu Mita atomic_set(&attr->times, times);
366ff1cb35SAkinobu Mita atomic_set(&attr->space, space);
376ff1cb35SAkinobu Mita
386ff1cb35SAkinobu Mita return 1;
396ff1cb35SAkinobu Mita }
406cba00eaSPer Forlin EXPORT_SYMBOL_GPL(setup_fault_attr);
416ff1cb35SAkinobu Mita
fail_dump(struct fault_attr * attr)426ff1cb35SAkinobu Mita static void fail_dump(struct fault_attr *attr)
436ff1cb35SAkinobu Mita {
446adc4a22SDmitry Monakhov if (attr->verbose > 0 && __ratelimit(&attr->ratelimit_state)) {
456adc4a22SDmitry Monakhov printk(KERN_NOTICE "FAULT_INJECTION: forcing a failure.\n"
466adc4a22SDmitry Monakhov "name %pd, interval %lu, probability %lu, "
476adc4a22SDmitry Monakhov "space %d, times %d\n", attr->dname,
48bb387002SFlorian Westphal attr->interval, attr->probability,
496adc4a22SDmitry Monakhov atomic_read(&attr->space),
506adc4a22SDmitry Monakhov atomic_read(&attr->times));
516ff1cb35SAkinobu Mita if (attr->verbose > 1)
526ff1cb35SAkinobu Mita dump_stack();
536ff1cb35SAkinobu Mita }
546adc4a22SDmitry Monakhov }
556ff1cb35SAkinobu Mita
566ff1cb35SAkinobu Mita #define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
576ff1cb35SAkinobu Mita
fail_task(struct fault_attr * attr,struct task_struct * task)5808b3df2dSDon Mullis static bool fail_task(struct fault_attr *attr, struct task_struct *task)
59f4f154fdSAkinobu Mita {
60f2ad37daSDmitry Vyukov return in_task() && task->make_it_fail;
61f4f154fdSAkinobu Mita }
62f4f154fdSAkinobu Mita
63a124c28eSDon Mullis #define MAX_STACK_TRACE_DEPTH 32
64a124c28eSDon Mullis
651df49008SAkinobu Mita #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
66329409aeSAkinobu Mita
fail_stacktrace(struct fault_attr * attr)6708b3df2dSDon Mullis static bool fail_stacktrace(struct fault_attr *attr)
68329409aeSAkinobu Mita {
69329409aeSAkinobu Mita int depth = attr->stacktrace_depth;
70329409aeSAkinobu Mita unsigned long entries[MAX_STACK_TRACE_DEPTH];
7130191250SThomas Gleixner int n, nr_entries;
72329409aeSAkinobu Mita bool found = (attr->require_start == 0 && attr->require_end == ULONG_MAX);
73329409aeSAkinobu Mita
744acb9e51SWei Yongjun if (depth == 0 || (found && !attr->reject_start && !attr->reject_end))
75329409aeSAkinobu Mita return found;
76329409aeSAkinobu Mita
7730191250SThomas Gleixner nr_entries = stack_trace_save(entries, depth, 1);
7830191250SThomas Gleixner for (n = 0; n < nr_entries; n++) {
79329409aeSAkinobu Mita if (attr->reject_start <= entries[n] &&
80329409aeSAkinobu Mita entries[n] < attr->reject_end)
8108b3df2dSDon Mullis return false;
82329409aeSAkinobu Mita if (attr->require_start <= entries[n] &&
83329409aeSAkinobu Mita entries[n] < attr->require_end)
8408b3df2dSDon Mullis found = true;
85329409aeSAkinobu Mita }
86329409aeSAkinobu Mita return found;
87329409aeSAkinobu Mita }
88329409aeSAkinobu Mita
89329409aeSAkinobu Mita #else
90329409aeSAkinobu Mita
fail_stacktrace(struct fault_attr * attr)9108b3df2dSDon Mullis static inline bool fail_stacktrace(struct fault_attr *attr)
92329409aeSAkinobu Mita {
931df49008SAkinobu Mita return true;
94329409aeSAkinobu Mita }
95329409aeSAkinobu Mita
961df49008SAkinobu Mita #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
97329409aeSAkinobu Mita
986ff1cb35SAkinobu Mita /*
996ff1cb35SAkinobu Mita * This code is stolen from failmalloc-1.0
1006ff1cb35SAkinobu Mita * http://www.nongnu.org/failmalloc/
1016ff1cb35SAkinobu Mita */
1026ff1cb35SAkinobu Mita
should_fail_ex(struct fault_attr * attr,ssize_t size,int flags)103ea4452deSQi Zheng bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags)
1046ff1cb35SAkinobu Mita {
105f9eeef59SWei Yongjun bool stack_checked = false;
106f9eeef59SWei Yongjun
1071203c8e6SAkinobu Mita if (in_task()) {
1081203c8e6SAkinobu Mita unsigned int fail_nth = READ_ONCE(current->fail_nth);
1091203c8e6SAkinobu Mita
1109eeb52aeSAkinobu Mita if (fail_nth) {
111f9eeef59SWei Yongjun if (!fail_stacktrace(attr))
112f9eeef59SWei Yongjun return false;
113f9eeef59SWei Yongjun
114f9eeef59SWei Yongjun stack_checked = true;
1159b4fb5ceSWill Deacon fail_nth--;
1169b4fb5ceSWill Deacon WRITE_ONCE(current->fail_nth, fail_nth);
1179b4fb5ceSWill Deacon if (!fail_nth)
118e41d5818SDmitry Vyukov goto fail;
1191203c8e6SAkinobu Mita
120e41d5818SDmitry Vyukov return false;
121e41d5818SDmitry Vyukov }
1229eeb52aeSAkinobu Mita }
123e41d5818SDmitry Vyukov
124f39cdaebSAnton Blanchard /* No need to check any other properties if the probability is 0 */
125f39cdaebSAnton Blanchard if (attr->probability == 0)
126f39cdaebSAnton Blanchard return false;
127f39cdaebSAnton Blanchard
128f4f154fdSAkinobu Mita if (attr->task_filter && !fail_task(attr, current))
12908b3df2dSDon Mullis return false;
130f4f154fdSAkinobu Mita
1316ff1cb35SAkinobu Mita if (atomic_read(&attr->times) == 0)
13208b3df2dSDon Mullis return false;
1336ff1cb35SAkinobu Mita
134f9eeef59SWei Yongjun if (!stack_checked && !fail_stacktrace(attr))
135f9eeef59SWei Yongjun return false;
136f9eeef59SWei Yongjun
1376ff1cb35SAkinobu Mita if (atomic_read(&attr->space) > size) {
1386ff1cb35SAkinobu Mita atomic_sub(size, &attr->space);
13908b3df2dSDon Mullis return false;
1406ff1cb35SAkinobu Mita }
1416ff1cb35SAkinobu Mita
1426ff1cb35SAkinobu Mita if (attr->interval > 1) {
1436ff1cb35SAkinobu Mita attr->count++;
1446ff1cb35SAkinobu Mita if (attr->count % attr->interval)
14508b3df2dSDon Mullis return false;
1466ff1cb35SAkinobu Mita }
1476ff1cb35SAkinobu Mita
1488032bf12SJason A. Donenfeld if (attr->probability <= get_random_u32_below(100))
14908b3df2dSDon Mullis return false;
1506ff1cb35SAkinobu Mita
151e41d5818SDmitry Vyukov fail:
152ea4452deSQi Zheng if (!(flags & FAULT_NOWARN))
1536ff1cb35SAkinobu Mita fail_dump(attr);
1546ff1cb35SAkinobu Mita
1556ff1cb35SAkinobu Mita if (atomic_read(&attr->times) != -1)
1566ff1cb35SAkinobu Mita atomic_dec_not_zero(&attr->times);
1576ff1cb35SAkinobu Mita
15808b3df2dSDon Mullis return true;
1596ff1cb35SAkinobu Mita }
160ea4452deSQi Zheng
should_fail(struct fault_attr * attr,ssize_t size)161ea4452deSQi Zheng bool should_fail(struct fault_attr *attr, ssize_t size)
162ea4452deSQi Zheng {
163ea4452deSQi Zheng return should_fail_ex(attr, size, 0);
164ea4452deSQi Zheng }
165df87ecbfSPer Forlin EXPORT_SYMBOL_GPL(should_fail);
1666ff1cb35SAkinobu Mita
1676ff1cb35SAkinobu Mita #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
1686ff1cb35SAkinobu Mita
debugfs_ul_set(void * data,u64 val)1698b88b099SChristoph Hellwig static int debugfs_ul_set(void *data, u64 val)
1706ff1cb35SAkinobu Mita {
1716ff1cb35SAkinobu Mita *(unsigned long *)data = val;
1728b88b099SChristoph Hellwig return 0;
1736ff1cb35SAkinobu Mita }
1746ff1cb35SAkinobu Mita
debugfs_ul_get(void * data,u64 * val)1758b88b099SChristoph Hellwig static int debugfs_ul_get(void *data, u64 *val)
1766ff1cb35SAkinobu Mita {
1778b88b099SChristoph Hellwig *val = *(unsigned long *)data;
1788b88b099SChristoph Hellwig return 0;
1796ff1cb35SAkinobu Mita }
1806ff1cb35SAkinobu Mita
1816ff1cb35SAkinobu Mita DEFINE_SIMPLE_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
1826ff1cb35SAkinobu Mita
debugfs_create_ul(const char * name,umode_t mode,struct dentry * parent,unsigned long * value)183053cf510SGreg Kroah-Hartman static void debugfs_create_ul(const char *name, umode_t mode,
1846ff1cb35SAkinobu Mita struct dentry *parent, unsigned long *value)
1856ff1cb35SAkinobu Mita {
186053cf510SGreg Kroah-Hartman debugfs_create_file(name, mode, parent, value, &fops_ul);
1876ff1cb35SAkinobu Mita }
1886ff1cb35SAkinobu Mita
1896ddb23c7SStephen Rothwell #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
190a124c28eSDon Mullis
debugfs_stacktrace_depth_set(void * data,u64 val)1918307fc25SAkinobu Mita static int debugfs_stacktrace_depth_set(void *data, u64 val)
1928307fc25SAkinobu Mita {
1938307fc25SAkinobu Mita *(unsigned long *)data =
1948307fc25SAkinobu Mita min_t(unsigned long, val, MAX_STACK_TRACE_DEPTH);
1958307fc25SAkinobu Mita
1968307fc25SAkinobu Mita return 0;
1978307fc25SAkinobu Mita }
1988307fc25SAkinobu Mita
1998307fc25SAkinobu Mita DEFINE_SIMPLE_ATTRIBUTE(fops_stacktrace_depth, debugfs_ul_get,
2008307fc25SAkinobu Mita debugfs_stacktrace_depth_set, "%llu\n");
2018307fc25SAkinobu Mita
debugfs_create_stacktrace_depth(const char * name,umode_t mode,struct dentry * parent,unsigned long * value)202053cf510SGreg Kroah-Hartman static void debugfs_create_stacktrace_depth(const char *name, umode_t mode,
203053cf510SGreg Kroah-Hartman struct dentry *parent,
204053cf510SGreg Kroah-Hartman unsigned long *value)
205a124c28eSDon Mullis {
206053cf510SGreg Kroah-Hartman debugfs_create_file(name, mode, parent, value, &fops_stacktrace_depth);
207a124c28eSDon Mullis }
2088307fc25SAkinobu Mita
2096ddb23c7SStephen Rothwell #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
210a124c28eSDon Mullis
fault_create_debugfs_attr(const char * name,struct dentry * parent,struct fault_attr * attr)211dd48c085SAkinobu Mita struct dentry *fault_create_debugfs_attr(const char *name,
212dd48c085SAkinobu Mita struct dentry *parent, struct fault_attr *attr)
2136ff1cb35SAkinobu Mita {
214f4ae40a6SAl Viro umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
2156ff1cb35SAkinobu Mita struct dentry *dir;
2166ff1cb35SAkinobu Mita
217dd48c085SAkinobu Mita dir = debugfs_create_dir(name, parent);
218053cf510SGreg Kroah-Hartman if (IS_ERR(dir))
219053cf510SGreg Kroah-Hartman return dir;
2207f5ddcc8SAkinobu Mita
221053cf510SGreg Kroah-Hartman debugfs_create_ul("probability", mode, dir, &attr->probability);
222053cf510SGreg Kroah-Hartman debugfs_create_ul("interval", mode, dir, &attr->interval);
223053cf510SGreg Kroah-Hartman debugfs_create_atomic_t("times", mode, dir, &attr->times);
224053cf510SGreg Kroah-Hartman debugfs_create_atomic_t("space", mode, dir, &attr->space);
225053cf510SGreg Kroah-Hartman debugfs_create_ul("verbose", mode, dir, &attr->verbose);
226053cf510SGreg Kroah-Hartman debugfs_create_u32("verbose_ratelimit_interval_ms", mode, dir,
227053cf510SGreg Kroah-Hartman &attr->ratelimit_state.interval);
228053cf510SGreg Kroah-Hartman debugfs_create_u32("verbose_ratelimit_burst", mode, dir,
229053cf510SGreg Kroah-Hartman &attr->ratelimit_state.burst);
230053cf510SGreg Kroah-Hartman debugfs_create_bool("task-filter", mode, dir, &attr->task_filter);
2311df49008SAkinobu Mita
2321df49008SAkinobu Mita #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
233053cf510SGreg Kroah-Hartman debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
234053cf510SGreg Kroah-Hartman &attr->stacktrace_depth);
23501999074SWei Yongjun debugfs_create_xul("require-start", mode, dir, &attr->require_start);
23601999074SWei Yongjun debugfs_create_xul("require-end", mode, dir, &attr->require_end);
23701999074SWei Yongjun debugfs_create_xul("reject-start", mode, dir, &attr->reject_start);
23801999074SWei Yongjun debugfs_create_xul("reject-end", mode, dir, &attr->reject_end);
2391df49008SAkinobu Mita #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
2401df49008SAkinobu Mita
2416adc4a22SDmitry Monakhov attr->dname = dget(dir);
242dd48c085SAkinobu Mita return dir;
2436ff1cb35SAkinobu Mita }
244df87ecbfSPer Forlin EXPORT_SYMBOL_GPL(fault_create_debugfs_attr);
2456ff1cb35SAkinobu Mita
2466ff1cb35SAkinobu Mita #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
247*4668c7a2SAkinobu Mita
248*4668c7a2SAkinobu Mita #ifdef CONFIG_FAULT_INJECTION_CONFIGFS
249*4668c7a2SAkinobu Mita
250*4668c7a2SAkinobu Mita /* These configfs attribute utilities are copied from drivers/block/null_blk/main.c */
251*4668c7a2SAkinobu Mita
fault_uint_attr_show(unsigned int val,char * page)252*4668c7a2SAkinobu Mita static ssize_t fault_uint_attr_show(unsigned int val, char *page)
253*4668c7a2SAkinobu Mita {
254*4668c7a2SAkinobu Mita return snprintf(page, PAGE_SIZE, "%u\n", val);
255*4668c7a2SAkinobu Mita }
256*4668c7a2SAkinobu Mita
fault_ulong_attr_show(unsigned long val,char * page)257*4668c7a2SAkinobu Mita static ssize_t fault_ulong_attr_show(unsigned long val, char *page)
258*4668c7a2SAkinobu Mita {
259*4668c7a2SAkinobu Mita return snprintf(page, PAGE_SIZE, "%lu\n", val);
260*4668c7a2SAkinobu Mita }
261*4668c7a2SAkinobu Mita
fault_bool_attr_show(bool val,char * page)262*4668c7a2SAkinobu Mita static ssize_t fault_bool_attr_show(bool val, char *page)
263*4668c7a2SAkinobu Mita {
264*4668c7a2SAkinobu Mita return snprintf(page, PAGE_SIZE, "%u\n", val);
265*4668c7a2SAkinobu Mita }
266*4668c7a2SAkinobu Mita
fault_atomic_t_attr_show(atomic_t val,char * page)267*4668c7a2SAkinobu Mita static ssize_t fault_atomic_t_attr_show(atomic_t val, char *page)
268*4668c7a2SAkinobu Mita {
269*4668c7a2SAkinobu Mita return snprintf(page, PAGE_SIZE, "%d\n", atomic_read(&val));
270*4668c7a2SAkinobu Mita }
271*4668c7a2SAkinobu Mita
fault_uint_attr_store(unsigned int * val,const char * page,size_t count)272*4668c7a2SAkinobu Mita static ssize_t fault_uint_attr_store(unsigned int *val, const char *page, size_t count)
273*4668c7a2SAkinobu Mita {
274*4668c7a2SAkinobu Mita unsigned int tmp;
275*4668c7a2SAkinobu Mita int result;
276*4668c7a2SAkinobu Mita
277*4668c7a2SAkinobu Mita result = kstrtouint(page, 0, &tmp);
278*4668c7a2SAkinobu Mita if (result < 0)
279*4668c7a2SAkinobu Mita return result;
280*4668c7a2SAkinobu Mita
281*4668c7a2SAkinobu Mita *val = tmp;
282*4668c7a2SAkinobu Mita return count;
283*4668c7a2SAkinobu Mita }
284*4668c7a2SAkinobu Mita
fault_ulong_attr_store(unsigned long * val,const char * page,size_t count)285*4668c7a2SAkinobu Mita static ssize_t fault_ulong_attr_store(unsigned long *val, const char *page, size_t count)
286*4668c7a2SAkinobu Mita {
287*4668c7a2SAkinobu Mita int result;
288*4668c7a2SAkinobu Mita unsigned long tmp;
289*4668c7a2SAkinobu Mita
290*4668c7a2SAkinobu Mita result = kstrtoul(page, 0, &tmp);
291*4668c7a2SAkinobu Mita if (result < 0)
292*4668c7a2SAkinobu Mita return result;
293*4668c7a2SAkinobu Mita
294*4668c7a2SAkinobu Mita *val = tmp;
295*4668c7a2SAkinobu Mita return count;
296*4668c7a2SAkinobu Mita }
297*4668c7a2SAkinobu Mita
fault_bool_attr_store(bool * val,const char * page,size_t count)298*4668c7a2SAkinobu Mita static ssize_t fault_bool_attr_store(bool *val, const char *page, size_t count)
299*4668c7a2SAkinobu Mita {
300*4668c7a2SAkinobu Mita bool tmp;
301*4668c7a2SAkinobu Mita int result;
302*4668c7a2SAkinobu Mita
303*4668c7a2SAkinobu Mita result = kstrtobool(page, &tmp);
304*4668c7a2SAkinobu Mita if (result < 0)
305*4668c7a2SAkinobu Mita return result;
306*4668c7a2SAkinobu Mita
307*4668c7a2SAkinobu Mita *val = tmp;
308*4668c7a2SAkinobu Mita return count;
309*4668c7a2SAkinobu Mita }
310*4668c7a2SAkinobu Mita
fault_atomic_t_attr_store(atomic_t * val,const char * page,size_t count)311*4668c7a2SAkinobu Mita static ssize_t fault_atomic_t_attr_store(atomic_t *val, const char *page, size_t count)
312*4668c7a2SAkinobu Mita {
313*4668c7a2SAkinobu Mita int tmp;
314*4668c7a2SAkinobu Mita int result;
315*4668c7a2SAkinobu Mita
316*4668c7a2SAkinobu Mita result = kstrtoint(page, 0, &tmp);
317*4668c7a2SAkinobu Mita if (result < 0)
318*4668c7a2SAkinobu Mita return result;
319*4668c7a2SAkinobu Mita
320*4668c7a2SAkinobu Mita atomic_set(val, tmp);
321*4668c7a2SAkinobu Mita return count;
322*4668c7a2SAkinobu Mita }
323*4668c7a2SAkinobu Mita
324*4668c7a2SAkinobu Mita #define CONFIGFS_ATTR_NAMED(_pfx, _name, _attr_name) \
325*4668c7a2SAkinobu Mita static struct configfs_attribute _pfx##attr_##_name = { \
326*4668c7a2SAkinobu Mita .ca_name = _attr_name, \
327*4668c7a2SAkinobu Mita .ca_mode = 0644, \
328*4668c7a2SAkinobu Mita .ca_owner = THIS_MODULE, \
329*4668c7a2SAkinobu Mita .show = _pfx##_name##_show, \
330*4668c7a2SAkinobu Mita .store = _pfx##_name##_store, \
331*4668c7a2SAkinobu Mita }
332*4668c7a2SAkinobu Mita
to_fault_config(struct config_item * item)333*4668c7a2SAkinobu Mita static struct fault_config *to_fault_config(struct config_item *item)
334*4668c7a2SAkinobu Mita {
335*4668c7a2SAkinobu Mita return container_of(to_config_group(item), struct fault_config, group);
336*4668c7a2SAkinobu Mita }
337*4668c7a2SAkinobu Mita
338*4668c7a2SAkinobu Mita #define FAULT_CONFIGFS_ATTR_NAMED(NAME, ATTR_NAME, MEMBER, TYPE) \
339*4668c7a2SAkinobu Mita static ssize_t fault_##NAME##_show(struct config_item *item, char *page) \
340*4668c7a2SAkinobu Mita { \
341*4668c7a2SAkinobu Mita return fault_##TYPE##_attr_show(to_fault_config(item)->attr.MEMBER, page); \
342*4668c7a2SAkinobu Mita } \
343*4668c7a2SAkinobu Mita static ssize_t fault_##NAME##_store(struct config_item *item, const char *page, size_t count) \
344*4668c7a2SAkinobu Mita { \
345*4668c7a2SAkinobu Mita struct fault_config *config = to_fault_config(item); \
346*4668c7a2SAkinobu Mita return fault_##TYPE##_attr_store(&config->attr.MEMBER, page, count); \
347*4668c7a2SAkinobu Mita } \
348*4668c7a2SAkinobu Mita CONFIGFS_ATTR_NAMED(fault_, NAME, ATTR_NAME)
349*4668c7a2SAkinobu Mita
350*4668c7a2SAkinobu Mita #define FAULT_CONFIGFS_ATTR(NAME, TYPE) \
351*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR_NAMED(NAME, __stringify(NAME), NAME, TYPE)
352*4668c7a2SAkinobu Mita
353*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR(probability, ulong);
354*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR(interval, ulong);
355*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR(times, atomic_t);
356*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR(space, atomic_t);
357*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR(verbose, ulong);
358*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR_NAMED(ratelimit_interval, "verbose_ratelimit_interval_ms",
359*4668c7a2SAkinobu Mita ratelimit_state.interval, uint);
360*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR_NAMED(ratelimit_burst, "verbose_ratelimit_burst",
361*4668c7a2SAkinobu Mita ratelimit_state.burst, uint);
362*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR_NAMED(task_filter, "task-filter", task_filter, bool);
363*4668c7a2SAkinobu Mita
364*4668c7a2SAkinobu Mita #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
365*4668c7a2SAkinobu Mita
fault_stacktrace_depth_show(struct config_item * item,char * page)366*4668c7a2SAkinobu Mita static ssize_t fault_stacktrace_depth_show(struct config_item *item, char *page)
367*4668c7a2SAkinobu Mita {
368*4668c7a2SAkinobu Mita return fault_ulong_attr_show(to_fault_config(item)->attr.stacktrace_depth, page);
369*4668c7a2SAkinobu Mita }
370*4668c7a2SAkinobu Mita
fault_stacktrace_depth_store(struct config_item * item,const char * page,size_t count)371*4668c7a2SAkinobu Mita static ssize_t fault_stacktrace_depth_store(struct config_item *item, const char *page,
372*4668c7a2SAkinobu Mita size_t count)
373*4668c7a2SAkinobu Mita {
374*4668c7a2SAkinobu Mita int result;
375*4668c7a2SAkinobu Mita unsigned long tmp;
376*4668c7a2SAkinobu Mita
377*4668c7a2SAkinobu Mita result = kstrtoul(page, 0, &tmp);
378*4668c7a2SAkinobu Mita if (result < 0)
379*4668c7a2SAkinobu Mita return result;
380*4668c7a2SAkinobu Mita
381*4668c7a2SAkinobu Mita to_fault_config(item)->attr.stacktrace_depth =
382*4668c7a2SAkinobu Mita min_t(unsigned long, tmp, MAX_STACK_TRACE_DEPTH);
383*4668c7a2SAkinobu Mita
384*4668c7a2SAkinobu Mita return count;
385*4668c7a2SAkinobu Mita }
386*4668c7a2SAkinobu Mita
387*4668c7a2SAkinobu Mita CONFIGFS_ATTR_NAMED(fault_, stacktrace_depth, "stacktrace-depth");
388*4668c7a2SAkinobu Mita
fault_xul_attr_show(unsigned long val,char * page)389*4668c7a2SAkinobu Mita static ssize_t fault_xul_attr_show(unsigned long val, char *page)
390*4668c7a2SAkinobu Mita {
391*4668c7a2SAkinobu Mita return snprintf(page, PAGE_SIZE,
392*4668c7a2SAkinobu Mita sizeof(val) == sizeof(u32) ? "0x%08lx\n" : "0x%016lx\n", val);
393*4668c7a2SAkinobu Mita }
394*4668c7a2SAkinobu Mita
fault_xul_attr_store(unsigned long * val,const char * page,size_t count)395*4668c7a2SAkinobu Mita static ssize_t fault_xul_attr_store(unsigned long *val, const char *page, size_t count)
396*4668c7a2SAkinobu Mita {
397*4668c7a2SAkinobu Mita return fault_ulong_attr_store(val, page, count);
398*4668c7a2SAkinobu Mita }
399*4668c7a2SAkinobu Mita
400*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR_NAMED(require_start, "require-start", require_start, xul);
401*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR_NAMED(require_end, "require-end", require_end, xul);
402*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR_NAMED(reject_start, "reject-start", reject_start, xul);
403*4668c7a2SAkinobu Mita FAULT_CONFIGFS_ATTR_NAMED(reject_end, "reject-end", reject_end, xul);
404*4668c7a2SAkinobu Mita
405*4668c7a2SAkinobu Mita #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
406*4668c7a2SAkinobu Mita
407*4668c7a2SAkinobu Mita static struct configfs_attribute *fault_config_attrs[] = {
408*4668c7a2SAkinobu Mita &fault_attr_probability,
409*4668c7a2SAkinobu Mita &fault_attr_interval,
410*4668c7a2SAkinobu Mita &fault_attr_times,
411*4668c7a2SAkinobu Mita &fault_attr_space,
412*4668c7a2SAkinobu Mita &fault_attr_verbose,
413*4668c7a2SAkinobu Mita &fault_attr_ratelimit_interval,
414*4668c7a2SAkinobu Mita &fault_attr_ratelimit_burst,
415*4668c7a2SAkinobu Mita &fault_attr_task_filter,
416*4668c7a2SAkinobu Mita #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
417*4668c7a2SAkinobu Mita &fault_attr_stacktrace_depth,
418*4668c7a2SAkinobu Mita &fault_attr_require_start,
419*4668c7a2SAkinobu Mita &fault_attr_require_end,
420*4668c7a2SAkinobu Mita &fault_attr_reject_start,
421*4668c7a2SAkinobu Mita &fault_attr_reject_end,
422*4668c7a2SAkinobu Mita #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
423*4668c7a2SAkinobu Mita NULL,
424*4668c7a2SAkinobu Mita };
425*4668c7a2SAkinobu Mita
426*4668c7a2SAkinobu Mita static const struct config_item_type fault_config_type = {
427*4668c7a2SAkinobu Mita .ct_attrs = fault_config_attrs,
428*4668c7a2SAkinobu Mita .ct_owner = THIS_MODULE,
429*4668c7a2SAkinobu Mita };
430*4668c7a2SAkinobu Mita
fault_config_init(struct fault_config * config,const char * name)431*4668c7a2SAkinobu Mita void fault_config_init(struct fault_config *config, const char *name)
432*4668c7a2SAkinobu Mita {
433*4668c7a2SAkinobu Mita config_group_init_type_name(&config->group, name, &fault_config_type);
434*4668c7a2SAkinobu Mita }
435*4668c7a2SAkinobu Mita EXPORT_SYMBOL_GPL(fault_config_init);
436*4668c7a2SAkinobu Mita
437*4668c7a2SAkinobu Mita #endif /* CONFIG_FAULT_INJECTION_CONFIGFS */
438