--- /dev/null
+/*
+ * jump label support
+ *
+ * Copyright (C) 2009 Jason Baron <jbaron@redhat.com>
+ * Copyright (C) 2011 Peter Zijlstra <pzijlstr@redhat.com>
+ *
+ */
+#include <linux/memory.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/sort.h>
+#include <linux/err.h>
+#include <linux/static_key.h>
+#include <linux/jump_label_ratelimit.h>
+
+#ifdef HAVE_JUMP_LABEL
+
+/* mutex to protect coming/going of the the jump_label table */
+static DEFINE_MUTEX(jump_label_mutex);
+
+void jump_label_lock(void)
+{
+ mutex_lock(&jump_label_mutex);
+}
+
+void jump_label_unlock(void)
+{
+ mutex_unlock(&jump_label_mutex);
+}
+
+static int jump_label_cmp(const void *a, const void *b)
+{
+ const struct jump_entry *jea = a;
+ const struct jump_entry *jeb = b;
+
+ if (jea->key < jeb->key)
+ return -1;
+
+ if (jea->key > jeb->key)
+ return 1;
+
+ return 0;
+}
+
+static void
+jump_label_sort_entries(struct jump_entry *start, struct jump_entry *stop)
+{
+ unsigned long size;
+
+ size = (((unsigned long)stop - (unsigned long)start)
+ / sizeof(struct jump_entry));
+ sort(start, size, sizeof(struct jump_entry), jump_label_cmp, NULL);
+}
+
+static void jump_label_update(struct static_key *key, int enable);
+
+void static_key_slow_inc(struct static_key *key)
+{
+ STATIC_KEY_CHECK_USE();
+ if (atomic_inc_not_zero(&key->enabled))
+ return;
+
+ jump_label_lock();
+ if (atomic_read(&key->enabled) == 0) {
+ if (!jump_label_get_branch_default(key))
+ jump_label_update(key, JUMP_LABEL_ENABLE);
+ else
+ jump_label_update(key, JUMP_LABEL_DISABLE);
+ }
+ atomic_inc(&key->enabled);
+ jump_label_unlock();
+}
+EXPORT_SYMBOL_GPL(static_key_slow_inc);
+
+static void __static_key_slow_dec(struct static_key *key,
+ unsigned long rate_limit, struct delayed_work *work)
+{
+ if (!atomic_dec_and_mutex_lock(&key->enabled, &jump_label_mutex)) {
+ WARN(atomic_read(&key->enabled) < 0,
+ "jump label: negative count!\n");
+ return;
+ }
+
+ if (rate_limit) {
+ atomic_inc(&key->enabled);
+ schedule_delayed_work(work, rate_limit);
+ } else {
+ if (!jump_label_get_branch_default(key))
+ jump_label_update(key, JUMP_LABEL_DISABLE);
+ else
+ jump_label_update(key, JUMP_LABEL_ENABLE);
+ }
+ jump_label_unlock();
+}
+
+static void jump_label_update_timeout(struct work_struct *work)
+{
+ struct static_key_deferred *key =
+ container_of(work, struct static_key_deferred, work.work);
+ __static_key_slow_dec(&key->key, 0, NULL);
+}
+
+void static_key_slow_dec(struct static_key *key)
+{
+ STATIC_KEY_CHECK_USE();
+ __static_key_slow_dec(key, 0, NULL);
+}
+EXPORT_SYMBOL_GPL(static_key_slow_dec);
+
+void static_key_slow_dec_deferred(struct static_key_deferred *key)
+{
+ STATIC_KEY_CHECK_USE();
+ __static_key_slow_dec(&key->key, key->timeout, &key->work);
+}
+EXPORT_SYMBOL_GPL(static_key_slow_dec_deferred);
+
+void jump_label_rate_limit(struct static_key_deferred *key,
+ unsigned long rl)
+{
+ STATIC_KEY_CHECK_USE();
+ key->timeout = rl;
+ INIT_DELAYED_WORK(&key->work, jump_label_update_timeout);
+}
+EXPORT_SYMBOL_GPL(jump_label_rate_limit);
+
+static int addr_conflict(struct jump_entry *entry, void *start, void *end)
+{
+ if (entry->code <= (unsigned long)end &&
+ entry->code + JUMP_LABEL_NOP_SIZE > (unsigned long)start)
+ return 1;
+
+ return 0;
+}
+
+static int __jump_label_text_reserved(struct jump_entry *iter_start,
+ struct jump_entry *iter_stop, void *start, void *end)
+{
+ struct jump_entry *iter;
+
+ iter = iter_start;
+ while (iter < iter_stop) {
+ if (addr_conflict(iter, start, end))
+ return 1;
+ iter++;
+ }
+
+ return 0;
+}
+
+/*
+ * Update code which is definitely not currently executing.
+ * Architectures which need heavyweight synchronization to modify
+ * running code can override this to make the non-live update case
+ * cheaper.
+ */
+void __weak __init_or_module arch_jump_label_transform_static(struct jump_entry *entry,
+ enum jump_label_type type)
+{
+ arch_jump_label_transform(entry, type);
+}
+
+static void __jump_label_update(struct static_key *key,
+ struct jump_entry *entry,
+ struct jump_entry *stop, int enable)
+{
+ for (; (entry < stop) &&
+ (entry->key == (jump_label_t)(unsigned long)key);
+ entry++) {
+ /*
+ * entry->code set to 0 invalidates module init text sections
+ * kernel_text_address() verifies we are not in core kernel
+ * init code, see jump_label_invalidate_module_init().
+ */
+ if (entry->code && kernel_text_address(entry->code))
+ arch_jump_label_transform(entry, enable);
+ }
+}
+
+static enum jump_label_type jump_label_type(struct static_key *key)
+{
+ bool true_branch = jump_label_get_branch_default(key);
+ bool state = static_key_enabled(key);
+
+ if ((!true_branch && state) || (true_branch && !state))
+ return JUMP_LABEL_ENABLE;
+
+ return JUMP_LABEL_DISABLE;
+}
+
+void __init jump_label_init(void)
+{
+ struct jump_entry *iter_start = __start___jump_table;
+ struct jump_entry *iter_stop = __stop___jump_table;
+ struct static_key *key = NULL;
+ struct jump_entry *iter;
+
+ jump_label_lock();
+ jump_label_sort_entries(iter_start, iter_stop);
+
+ for (iter = iter_start; iter < iter_stop; iter++) {
+ struct static_key *iterk;
+
+ iterk = (struct static_key *)(unsigned long)iter->key;
+ arch_jump_label_transform_static(iter, jump_label_type(iterk));
+ if (iterk == key)
+ continue;
+
+ key = iterk;
+ /*
+ * Set key->entries to iter, but preserve JUMP_LABEL_TRUE_BRANCH.
+ */
+ *((unsigned long *)&key->entries) += (unsigned long)iter;
+#ifdef CONFIG_MODULES
+ key->next = NULL;
+#endif
+ }
+ static_key_initialized = true;
+ jump_label_unlock();
+}
+
+#ifdef CONFIG_MODULES
+
+struct static_key_mod {
+ struct static_key_mod *next;
+ struct jump_entry *entries;
+ struct module *mod;
+};
+
+static int __jump_label_mod_text_reserved(void *start, void *end)
+{
+ struct module *mod;
+
+ mod = __module_text_address((unsigned long)start);
+ if (!mod)
+ return 0;
+
+ WARN_ON_ONCE(__module_text_address((unsigned long)end) != mod);
+
+ return __jump_label_text_reserved(mod->jump_entries,
+ mod->jump_entries + mod->num_jump_entries,
+ start, end);
+}
+
+static void __jump_label_mod_update(struct static_key *key, int enable)
+{
+ struct static_key_mod *mod = key->next;
+
+ while (mod) {
+ struct module *m = mod->mod;
+
+ __jump_label_update(key, mod->entries,
+ m->jump_entries + m->num_jump_entries,
+ enable);
+ mod = mod->next;
+ }
+}
+
+/***
+ * apply_jump_label_nops - patch module jump labels with arch_get_jump_label_nop()
+ * @mod: module to patch
+ *
+ * Allow for run-time selection of the optimal nops. Before the module
+ * loads patch these with arch_get_jump_label_nop(), which is specified by
+ * the arch specific jump label code.
+ */
+void jump_label_apply_nops(struct module *mod)
+{
+ struct jump_entry *iter_start = mod->jump_entries;
+ struct jump_entry *iter_stop = iter_start + mod->num_jump_entries;
+ struct jump_entry *iter;
+
+ /* if the module doesn't have jump label entries, just return */
+ if (iter_start == iter_stop)
+ return;
+
+ for (iter = iter_start; iter < iter_stop; iter++) {
+ arch_jump_label_transform_static(iter, JUMP_LABEL_DISABLE);
+ }
+}
+
+static int jump_label_add_module(struct module *mod)
+{
+ struct jump_entry *iter_start = mod->jump_entries;
+ struct jump_entry *iter_stop = iter_start + mod->num_jump_entries;
+ struct jump_entry *iter;
+ struct static_key *key = NULL;
+ struct static_key_mod *jlm;
+
+ /* if the module doesn't have jump label entries, just return */
+ if (iter_start == iter_stop)
+ return 0;
+
+ jump_label_sort_entries(iter_start, iter_stop);
+
+ for (iter = iter_start; iter < iter_stop; iter++) {
+ struct static_key *iterk;
+
+ iterk = (struct static_key *)(unsigned long)iter->key;
+ if (iterk == key)
+ continue;
+
+ key = iterk;
+ if (__module_address(iter->key) == mod) {
+ /*
+ * Set key->entries to iter, but preserve JUMP_LABEL_TRUE_BRANCH.
+ */
+ *((unsigned long *)&key->entries) += (unsigned long)iter;
+ key->next = NULL;
+ continue;
+ }
+ jlm = kzalloc(sizeof(struct static_key_mod), GFP_KERNEL);
+ if (!jlm)
+ return -ENOMEM;
+ jlm->mod = mod;
+ jlm->entries = iter;
+ jlm->next = key->next;
+ key->next = jlm;
+
+ if (jump_label_type(key) == JUMP_LABEL_ENABLE)
+ __jump_label_update(key, iter, iter_stop, JUMP_LABEL_ENABLE);
+ }
+
+ return 0;
+}
+
+static void jump_label_del_module(struct module *mod)
+{
+ struct jump_entry *iter_start = mod->jump_entries;
+ struct jump_entry *iter_stop = iter_start + mod->num_jump_entries;
+ struct jump_entry *iter;
+ struct static_key *key = NULL;
+ struct static_key_mod *jlm, **prev;
+
+ for (iter = iter_start; iter < iter_stop; iter++) {
+ if (iter->key == (jump_label_t)(unsigned long)key)
+ continue;
+
+ key = (struct static_key *)(unsigned long)iter->key;
+
+ if (__module_address(iter->key) == mod)
+ continue;
+
+ prev = &key->next;
+ jlm = key->next;
+
+ while (jlm && jlm->mod != mod) {
+ prev = &jlm->next;
+ jlm = jlm->next;
+ }
+
+ if (jlm) {
+ *prev = jlm->next;
+ kfree(jlm);
+ }
+ }
+}
+
+static void jump_label_invalidate_module_init(struct module *mod)
+{
+ struct jump_entry *iter_start = mod->jump_entries;
+ struct jump_entry *iter_stop = iter_start + mod->num_jump_entries;
+ struct jump_entry *iter;
+
+ for (iter = iter_start; iter < iter_stop; iter++) {
+ if (within_module_init(iter->code, mod))
+ iter->code = 0;
+ }
+}
+
+static int
+jump_label_module_notify(struct notifier_block *self, unsigned long val,
+ void *data)
+{
+ struct module *mod = data;
+ int ret = 0;
+
+ switch (val) {
+ case MODULE_STATE_COMING:
+ jump_label_lock();
+ ret = jump_label_add_module(mod);
+ if (ret)
+ jump_label_del_module(mod);
+ jump_label_unlock();
+ break;
+ case MODULE_STATE_GOING:
+ jump_label_lock();
+ jump_label_del_module(mod);
+ jump_label_unlock();
+ break;
+ case MODULE_STATE_LIVE:
+ jump_label_lock();
+ jump_label_invalidate_module_init(mod);
+ jump_label_unlock();
+ break;
+ }
+
+ return notifier_from_errno(ret);
+}
+
+struct notifier_block jump_label_module_nb = {
+ .notifier_call = jump_label_module_notify,
+ .priority = 1, /* higher than tracepoints */
+};
+
+static __init int jump_label_init_module(void)
+{
+ return register_module_notifier(&jump_label_module_nb);
+}
+early_initcall(jump_label_init_module);
+
+#endif /* CONFIG_MODULES */
+
+/***
+ * jump_label_text_reserved - check if addr range is reserved
+ * @start: start text addr
+ * @end: end text addr
+ *
+ * checks if the text addr located between @start and @end
+ * overlaps with any of the jump label patch addresses. Code
+ * that wants to modify kernel text should first verify that
+ * it does not overlap with any of the jump label addresses.
+ * Caller must hold jump_label_mutex.
+ *
+ * returns 1 if there is an overlap, 0 otherwise
+ */
+int jump_label_text_reserved(void *start, void *end)
+{
+ int ret = __jump_label_text_reserved(__start___jump_table,
+ __stop___jump_table, start, end);
+
+ if (ret)
+ return ret;
+
+#ifdef CONFIG_MODULES
+ ret = __jump_label_mod_text_reserved(start, end);
+#endif
+ return ret;
+}
+
+static void jump_label_update(struct static_key *key, int enable)
+{
+ struct jump_entry *stop = __stop___jump_table;
+ struct jump_entry *entry = jump_label_get_entries(key);
+
+#ifdef CONFIG_MODULES
+ struct module *mod = __module_address((unsigned long)key);
+
+ __jump_label_mod_update(key, enable);
+
+ if (mod)
+ stop = mod->jump_entries + mod->num_jump_entries;
+#endif
+ /* if there are no users, entry can be NULL */
+ if (entry)
+ __jump_label_update(key, entry, stop, enable);
+}
+
+#endif
Code Review / kvmfornfv.git / blobdiff