ftrace_trace_function = ftrace_stub;
}
-static void per_cpu_ops_disable_all(struct ftrace_ops *ops)
-{
- int cpu;
-
- for_each_possible_cpu(cpu)
- *per_cpu_ptr(ops->disabled, cpu) = 1;
-}
-
-static int per_cpu_ops_alloc(struct ftrace_ops *ops)
-{
- int __percpu *disabled;
-
- if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU)))
- return -EINVAL;
-
- disabled = alloc_percpu(int);
- if (!disabled)
- return -ENOMEM;
-
- ops->disabled = disabled;
- per_cpu_ops_disable_all(ops);
- return 0;
-}
-
static void ftrace_sync(struct work_struct *work)
{
/*
* If this is a dynamic, RCU, or per CPU ops, or we force list func,
* then it needs to call the list anyway.
*/
- if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_PER_CPU |
- FTRACE_OPS_FL_RCU) || FTRACE_FORCE_LIST_FUNC)
+ if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_RCU) ||
+ FTRACE_FORCE_LIST_FUNC)
return ftrace_ops_list_func;
return ftrace_ops_get_func(ops);
if (!core_kernel_data((unsigned long)ops))
ops->flags |= FTRACE_OPS_FL_DYNAMIC;
- if (ops->flags & FTRACE_OPS_FL_PER_CPU) {
- if (per_cpu_ops_alloc(ops))
- return -ENOMEM;
- }
-
add_ftrace_ops(&ftrace_ops_list, ops);
/* Always save the function, and reset at unregistering */
{
}
-static void per_cpu_ops_free(struct ftrace_ops *ops)
-{
- free_percpu(ops->disabled);
-}
-
static void ftrace_startup_enable(int command)
{
if (saved_ftrace_func != ftrace_trace_function) {
* not currently active, we can just free them
* without synchronizing all CPUs.
*/
- if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_PER_CPU))
+ if (ops->flags & FTRACE_OPS_FL_DYNAMIC)
goto free_ops;
return 0;
* The same goes for freeing the per_cpu data of the per_cpu
* ops.
*/
- if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_PER_CPU)) {
+ if (ops->flags & FTRACE_OPS_FL_DYNAMIC) {
/*
* We need to do a hard force of sched synchronization.
* This is because we use preempt_disable() to do RCU, but
free_ops:
arch_ftrace_trampoline_free(ops);
-
- if (ops->flags & FTRACE_OPS_FL_PER_CPU)
- per_cpu_ops_free(ops);
}
return 0;
return ret;
}
+struct ftrace_mod_func {
+ struct list_head list;
+ char *name;
+ unsigned long ip;
+ unsigned int size;
+};
+
+struct ftrace_mod_map {
+ struct rcu_head rcu;
+ struct list_head list;
+ struct module *mod;
+ unsigned long start_addr;
+ unsigned long end_addr;
+ struct list_head funcs;
+ unsigned int num_funcs;
+};
+
#ifdef CONFIG_MODULES
#define next_to_ftrace_page(p) container_of(p, struct ftrace_page, next)
+static LIST_HEAD(ftrace_mod_maps);
+
static int referenced_filters(struct dyn_ftrace *rec)
{
struct ftrace_ops *ops;
mutex_unlock(&trace_types_lock);
}
+static void ftrace_free_mod_map(struct rcu_head *rcu)
+{
+ struct ftrace_mod_map *mod_map = container_of(rcu, struct ftrace_mod_map, rcu);
+ struct ftrace_mod_func *mod_func;
+ struct ftrace_mod_func *n;
+
+ /* All the contents of mod_map are now not visible to readers */
+ list_for_each_entry_safe(mod_func, n, &mod_map->funcs, list) {
+ kfree(mod_func->name);
+ list_del(&mod_func->list);
+ kfree(mod_func);
+ }
+
+ kfree(mod_map);
+}
+
void ftrace_release_mod(struct module *mod)
{
+ struct ftrace_mod_map *mod_map;
+ struct ftrace_mod_map *n;
struct dyn_ftrace *rec;
struct ftrace_page **last_pg;
struct ftrace_page *tmp_page = NULL;
if (ftrace_disabled)
goto out_unlock;
+ list_for_each_entry_safe(mod_map, n, &ftrace_mod_maps, list) {
+ if (mod_map->mod == mod) {
+ list_del_rcu(&mod_map->list);
+ call_rcu_sched(&mod_map->rcu, ftrace_free_mod_map);
+ break;
+ }
+ }
+
/*
* Each module has its own ftrace_pages, remove
* them from the list.
last_pg = &ftrace_pages_start;
for (pg = ftrace_pages_start; pg; pg = *last_pg) {
rec = &pg->records[0];
- if (within_module_core(rec->ip, mod)) {
+ if (within_module_core(rec->ip, mod) ||
+ within_module_init(rec->ip, mod)) {
/*
* As core pages are first, the first
* page should never be a module page.
* not part of this module, then skip this pg,
* which the "break" will do.
*/
- if (!within_module_core(rec->ip, mod))
+ if (!within_module_core(rec->ip, mod) &&
+ !within_module_init(rec->ip, mod))
break;
cnt = 0;
ftrace_process_locs(mod, mod->ftrace_callsites,
mod->ftrace_callsites + mod->num_ftrace_callsites);
}
+
+static void save_ftrace_mod_rec(struct ftrace_mod_map *mod_map,
+ struct dyn_ftrace *rec)
+{
+ struct ftrace_mod_func *mod_func;
+ unsigned long symsize;
+ unsigned long offset;
+ char str[KSYM_SYMBOL_LEN];
+ char *modname;
+ const char *ret;
+
+ ret = kallsyms_lookup(rec->ip, &symsize, &offset, &modname, str);
+ if (!ret)
+ return;
+
+ mod_func = kmalloc(sizeof(*mod_func), GFP_KERNEL);
+ if (!mod_func)
+ return;
+
+ mod_func->name = kstrdup(str, GFP_KERNEL);
+ if (!mod_func->name) {
+ kfree(mod_func);
+ return;
+ }
+
+ mod_func->ip = rec->ip - offset;
+ mod_func->size = symsize;
+
+ mod_map->num_funcs++;
+
+ list_add_rcu(&mod_func->list, &mod_map->funcs);
+}
+
+static struct ftrace_mod_map *
+allocate_ftrace_mod_map(struct module *mod,
+ unsigned long start, unsigned long end)
+{
+ struct ftrace_mod_map *mod_map;
+
+ mod_map = kmalloc(sizeof(*mod_map), GFP_KERNEL);
+ if (!mod_map)
+ return NULL;
+
+ mod_map->mod = mod;
+ mod_map->start_addr = start;
+ mod_map->end_addr = end;
+ mod_map->num_funcs = 0;
+
+ INIT_LIST_HEAD_RCU(&mod_map->funcs);
+
+ list_add_rcu(&mod_map->list, &ftrace_mod_maps);
+
+ return mod_map;
+}
+
+static const char *
+ftrace_func_address_lookup(struct ftrace_mod_map *mod_map,
+ unsigned long addr, unsigned long *size,
+ unsigned long *off, char *sym)
+{
+ struct ftrace_mod_func *found_func = NULL;
+ struct ftrace_mod_func *mod_func;
+
+ list_for_each_entry_rcu(mod_func, &mod_map->funcs, list) {
+ if (addr >= mod_func->ip &&
+ addr < mod_func->ip + mod_func->size) {
+ found_func = mod_func;
+ break;
+ }
+ }
+
+ if (found_func) {
+ if (size)
+ *size = found_func->size;
+ if (off)
+ *off = addr - found_func->ip;
+ if (sym)
+ strlcpy(sym, found_func->name, KSYM_NAME_LEN);
+
+ return found_func->name;
+ }
+
+ return NULL;
+}
+
+const char *
+ftrace_mod_address_lookup(unsigned long addr, unsigned long *size,
+ unsigned long *off, char **modname, char *sym)
+{
+ struct ftrace_mod_map *mod_map;
+ const char *ret = NULL;
+
+ /* mod_map is freed via call_rcu_sched() */
+ preempt_disable();
+ list_for_each_entry_rcu(mod_map, &ftrace_mod_maps, list) {
+ ret = ftrace_func_address_lookup(mod_map, addr, size, off, sym);
+ if (ret) {
+ if (modname)
+ *modname = mod_map->mod->name;
+ break;
+ }
+ }
+ preempt_enable();
+
+ return ret;
+}
+
+int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,
+ char *type, char *name,
+ char *module_name, int *exported)
+{
+ struct ftrace_mod_map *mod_map;
+ struct ftrace_mod_func *mod_func;
+
+ preempt_disable();
+ list_for_each_entry_rcu(mod_map, &ftrace_mod_maps, list) {
+
+ if (symnum >= mod_map->num_funcs) {
+ symnum -= mod_map->num_funcs;
+ continue;
+ }
+
+ list_for_each_entry_rcu(mod_func, &mod_map->funcs, list) {
+ if (symnum > 1) {
+ symnum--;
+ continue;
+ }
+
+ *value = mod_func->ip;
+ *type = 'T';
+ strlcpy(name, mod_func->name, KSYM_NAME_LEN);
+ strlcpy(module_name, mod_map->mod->name, MODULE_NAME_LEN);
+ *exported = 1;
+ preempt_enable();
+ return 0;
+ }
+ WARN_ON(1);
+ break;
+ }
+ preempt_enable();
+ return -ERANGE;
+}
+
+#else
+static void save_ftrace_mod_rec(struct ftrace_mod_map *mod_map,
+ struct dyn_ftrace *rec) { }
+static inline struct ftrace_mod_map *
+allocate_ftrace_mod_map(struct module *mod,
+ unsigned long start, unsigned long end)
+{
+ return NULL;
+}
#endif /* CONFIG_MODULES */
-void __init ftrace_free_init_mem(void)
+struct ftrace_init_func {
+ struct list_head list;
+ unsigned long ip;
+};
+
+/* Clear any init ips from hashes */
+static void
+clear_func_from_hash(struct ftrace_init_func *func, struct ftrace_hash *hash)
+{
+ struct ftrace_func_entry *entry;
+
+ if (ftrace_hash_empty(hash))
+ return;
+
+ entry = __ftrace_lookup_ip(hash, func->ip);
+
+ /*
+ * Do not allow this rec to match again.
+ * Yeah, it may waste some memory, but will be removed
+ * if/when the hash is modified again.
+ */
+ if (entry)
+ entry->ip = 0;
+}
+
+static void
+clear_func_from_hashes(struct ftrace_init_func *func)
+{
+ struct trace_array *tr;
+
+ mutex_lock(&trace_types_lock);
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+ if (!tr->ops || !tr->ops->func_hash)
+ continue;
+ mutex_lock(&tr->ops->func_hash->regex_lock);
+ clear_func_from_hash(func, tr->ops->func_hash->filter_hash);
+ clear_func_from_hash(func, tr->ops->func_hash->notrace_hash);
+ mutex_unlock(&tr->ops->func_hash->regex_lock);
+ }
+ mutex_unlock(&trace_types_lock);
+}
+
+static void add_to_clear_hash_list(struct list_head *clear_list,
+ struct dyn_ftrace *rec)
+{
+ struct ftrace_init_func *func;
+
+ func = kmalloc(sizeof(*func), GFP_KERNEL);
+ if (!func) {
+ WARN_ONCE(1, "alloc failure, ftrace filter could be stale\n");
+ return;
+ }
+
+ func->ip = rec->ip;
+ list_add(&func->list, clear_list);
+}
+
+void ftrace_free_mem(struct module *mod, void *start_ptr, void *end_ptr)
{
- unsigned long start = (unsigned long)(&__init_begin);
- unsigned long end = (unsigned long)(&__init_end);
+ unsigned long start = (unsigned long)(start_ptr);
+ unsigned long end = (unsigned long)(end_ptr);
struct ftrace_page **last_pg = &ftrace_pages_start;
struct ftrace_page *pg;
struct dyn_ftrace *rec;
struct dyn_ftrace key;
+ struct ftrace_mod_map *mod_map = NULL;
+ struct ftrace_init_func *func, *func_next;
+ struct list_head clear_hash;
int order;
+ INIT_LIST_HEAD(&clear_hash);
+
key.ip = start;
key.flags = end; /* overload flags, as it is unsigned long */
mutex_lock(&ftrace_lock);
+ /*
+ * If we are freeing module init memory, then check if
+ * any tracer is active. If so, we need to save a mapping of
+ * the module functions being freed with the address.
+ */
+ if (mod && ftrace_ops_list != &ftrace_list_end)
+ mod_map = allocate_ftrace_mod_map(mod, start, end);
+
for (pg = ftrace_pages_start; pg; last_pg = &pg->next, pg = *last_pg) {
if (end < pg->records[0].ip ||
start >= (pg->records[pg->index - 1].ip + MCOUNT_INSN_SIZE))
ftrace_cmp_recs);
if (!rec)
continue;
+
+ /* rec will be cleared from hashes after ftrace_lock unlock */
+ add_to_clear_hash_list(&clear_hash, rec);
+
+ if (mod_map)
+ save_ftrace_mod_rec(mod_map, rec);
+
pg->index--;
ftrace_update_tot_cnt--;
if (!pg->index) {
goto again;
}
mutex_unlock(&ftrace_lock);
+
+ list_for_each_entry_safe(func, func_next, &clear_hash, list) {
+ clear_func_from_hashes(func);
+ kfree(func);
+ }
+}
+
+void __init ftrace_free_init_mem(void)
+{
+ void *start = (void *)(&__init_begin);
+ void *end = (void *)(&__init_end);
+
+ ftrace_free_mem(NULL, start, end);
}
void __init ftrace_init(void)
* If any of the above fails then the op->func() is not executed.
*/
if ((!(op->flags & FTRACE_OPS_FL_RCU) || rcu_is_watching()) &&
- (!(op->flags & FTRACE_OPS_FL_PER_CPU) ||
- !ftrace_function_local_disabled(op)) &&
ftrace_ops_test(op, ip, regs)) {
-
if (FTRACE_WARN_ON(!op->func)) {
pr_warn("op=%p %pS\n", op, op);
goto out;
preempt_disable_notrace();
- if (!(op->flags & FTRACE_OPS_FL_PER_CPU) ||
- !ftrace_function_local_disabled(op)) {
- op->func(ip, parent_ip, op, regs);
- }
+ op->func(ip, parent_ip, op, regs);
preempt_enable_notrace();
trace_clear_recursion(bit);
* or does per cpu logic, then we need to call the assist handler.
*/
if (!(ops->flags & FTRACE_OPS_FL_RECURSION_SAFE) ||
- ops->flags & (FTRACE_OPS_FL_RCU | FTRACE_OPS_FL_PER_CPU))
+ ops->flags & FTRACE_OPS_FL_RCU)
return ftrace_ops_assist_func;
return ops->func;
projects / linux-block.git / blobdiff