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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/kernel/rcu/rcu.h
....@@ -1,36 +1,18 @@
1
+/* SPDX-License-Identifier: GPL-2.0+ */
12 /*
23  * Read-Copy Update definitions shared among RCU implementations.
34  *
4
- * This program is free software; you can redistribute it and/or modify
5
- * it under the terms of the GNU General Public License as published by
6
- * the Free Software Foundation; either version 2 of the License, or
7
- * (at your option) any later version.
8
- *
9
- * This program is distributed in the hope that it will be useful,
10
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
- * GNU General Public License for more details.
13
- *
14
- * You should have received a copy of the GNU General Public License
15
- * along with this program; if not, you can access it online at
16
- * http://www.gnu.org/licenses/gpl-2.0.html.
17
- *
185  * Copyright IBM Corporation, 2011
196  *
20
- * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
7
+ * Author: Paul E. McKenney <paulmck@linux.ibm.com>
218  */
229 
2310 #ifndef __LINUX_RCU_H
2411 #define __LINUX_RCU_H
2512 
2613 #include <trace/events/rcu.h>
27
-#ifdef CONFIG_RCU_TRACE
28
-#define RCU_TRACE(stmt) stmt
29
-#else /* #ifdef CONFIG_RCU_TRACE */
30
-#define RCU_TRACE(stmt)
31
-#endif /* #else #ifdef CONFIG_RCU_TRACE */
3214 
33
-/* Offset to allow for unmatched rcu_irq_{enter,exit}(). */
15
+/* Offset to allow distinguishing irq vs. task-based idle entry/exit. */
3416 #define DYNTICK_IRQ_NONIDLE	((LONG_MAX / 2) + 1)
3517 
3618 
....@@ -176,15 +158,16 @@
176158 
177159 /*
178160  * debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally
179
- * by call_rcu() and rcu callback execution, and are therefore not part of the
180
- * RCU API. Leaving in rcupdate.h because they are used by all RCU flavors.
161
+ * by call_rcu() and rcu callback execution, and are therefore not part
162
+ * of the RCU API. These are in rcupdate.h because they are used by all
163
+ * RCU implementations.
181164  */
182165 
183166 #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
184167 # define STATE_RCU_HEAD_READY	0
185168 # define STATE_RCU_HEAD_QUEUED	1
186169 
187
-extern struct debug_obj_descr rcuhead_debug_descr;
170
+extern const struct debug_obj_descr rcuhead_debug_descr;
188171 
189172 static inline int debug_rcu_head_queue(struct rcu_head *head)
190173 {
....@@ -215,34 +198,24 @@
215198 }
216199 #endif	/* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */
217200 
218
-void kfree(const void *);
201
+extern int rcu_cpu_stall_suppress_at_boot;
219202 
220
-/*
221
- * Reclaim the specified callback, either by invoking it (non-lazy case)
222
- * or freeing it directly (lazy case).  Return true if lazy, false otherwise.
223
- */
224
-static inline bool __rcu_reclaim(const char *rn, struct rcu_head *head)
203
+static inline bool rcu_stall_is_suppressed_at_boot(void)
225204 {
226
-	unsigned long offset = (unsigned long)head->func;
227
-
228
-	rcu_lock_acquire(&rcu_callback_map);
229
-	if (__is_kfree_rcu_offset(offset)) {
230
-		RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset);)
231
-		kfree((void *)head - offset);
232
-		rcu_lock_release(&rcu_callback_map);
233
-		return true;
234
-	} else {
235
-		RCU_TRACE(trace_rcu_invoke_callback(rn, head);)
236
-		head->func(head);
237
-		rcu_lock_release(&rcu_callback_map);
238
-		return false;
239
-	}
205
+	return rcu_cpu_stall_suppress_at_boot && !rcu_inkernel_boot_has_ended();
240206 }
241207 
242208 #ifdef CONFIG_RCU_STALL_COMMON
243209 
210
+extern int rcu_cpu_stall_ftrace_dump;
244211 extern int rcu_cpu_stall_suppress;
212
+extern int rcu_cpu_stall_timeout;
245213 int rcu_jiffies_till_stall_check(void);
214
+
215
+static inline bool rcu_stall_is_suppressed(void)
216
+{
217
+	return rcu_stall_is_suppressed_at_boot() || rcu_cpu_stall_suppress;
218
+}
246219 
247220 #define rcu_ftrace_dump_stall_suppress() \
248221 do { \
....@@ -257,6 +230,11 @@
257230 } while (0)
258231 
259232 #else /* #endif #ifdef CONFIG_RCU_STALL_COMMON */
233
+
234
+static inline bool rcu_stall_is_suppressed(void)
235
+{
236
+	return rcu_stall_is_suppressed_at_boot();
237
+}
260238 #define rcu_ftrace_dump_stall_suppress()
261239 #define rcu_ftrace_dump_stall_unsuppress()
262240 #endif /* #ifdef CONFIG_RCU_STALL_COMMON */
....@@ -293,7 +271,7 @@
293271  */
294272 extern void resched_cpu(int cpu);
295273 
296
-#if defined(SRCU) || !defined(TINY_RCU)
274
+#if defined(CONFIG_SRCU) || !defined(CONFIG_TINY_RCU)
297275 
298276 #include <linux/rcu_node_tree.h>
299277 
....@@ -311,6 +289,8 @@
311289 {
312290 	int i;
313291 
292
+	for (i = 0; i < RCU_NUM_LVLS; i++)
293
+		levelspread[i] = INT_MIN;
314294 	if (rcu_fanout_exact) {
315295 		levelspread[rcu_num_lvls - 1] = rcu_fanout_leaf;
316296 		for (i = rcu_num_lvls - 2; i >= 0; i--)
....@@ -328,46 +308,44 @@
328308 	}
329309 }
330310 
331
-/* Returns first leaf rcu_node of the specified RCU flavor. */
332
-#define rcu_first_leaf_node(rsp) ((rsp)->level[rcu_num_lvls - 1])
311
+extern void rcu_init_geometry(void);
312
+
313
+/* Returns a pointer to the first leaf rcu_node structure. */
314
+#define rcu_first_leaf_node() (rcu_state.level[rcu_num_lvls - 1])
333315 
334316 /* Is this rcu_node a leaf? */
335317 #define rcu_is_leaf_node(rnp) ((rnp)->level == rcu_num_lvls - 1)
336318 
337319 /* Is this rcu_node the last leaf? */
338
-#define rcu_is_last_leaf_node(rsp, rnp) ((rnp) == &(rsp)->node[rcu_num_nodes - 1])
320
+#define rcu_is_last_leaf_node(rnp) ((rnp) == &rcu_state.node[rcu_num_nodes - 1])
339321 
340322 /*
341
- * Do a full breadth-first scan of the rcu_node structures for the
342
- * specified rcu_state structure.
323
+ * Do a full breadth-first scan of the {s,}rcu_node structures for the
324
+ * specified state structure (for SRCU) or the only rcu_state structure
325
+ * (for RCU).
343326  */
344
-#define rcu_for_each_node_breadth_first(rsp, rnp) \
345
-	for ((rnp) = &(rsp)->node[0]; \
346
-	     (rnp) < &(rsp)->node[rcu_num_nodes]; (rnp)++)
327
+#define srcu_for_each_node_breadth_first(sp, rnp) \
328
+	for ((rnp) = &(sp)->node[0]; \
329
+	     (rnp) < &(sp)->node[rcu_num_nodes]; (rnp)++)
330
+#define rcu_for_each_node_breadth_first(rnp) \
331
+	srcu_for_each_node_breadth_first(&rcu_state, rnp)
347332 
348333 /*
349
- * Do a breadth-first scan of the non-leaf rcu_node structures for the
350
- * specified rcu_state structure.  Note that if there is a singleton
351
- * rcu_node tree with but one rcu_node structure, this loop is a no-op.
334
+ * Scan the leaves of the rcu_node hierarchy for the rcu_state structure.
335
+ * Note that if there is a singleton rcu_node tree with but one rcu_node
336
+ * structure, this loop -will- visit the rcu_node structure.  It is still
337
+ * a leaf node, even if it is also the root node.
352338  */
353
-#define rcu_for_each_nonleaf_node_breadth_first(rsp, rnp) \
354
-	for ((rnp) = &(rsp)->node[0]; !rcu_is_leaf_node(rsp, rnp); (rnp)++)
355
-
356
-/*
357
- * Scan the leaves of the rcu_node hierarchy for the specified rcu_state
358
- * structure.  Note that if there is a singleton rcu_node tree with but
359
- * one rcu_node structure, this loop -will- visit the rcu_node structure.
360
- * It is still a leaf node, even if it is also the root node.
361
- */
362
-#define rcu_for_each_leaf_node(rsp, rnp) \
363
-	for ((rnp) = rcu_first_leaf_node(rsp); \
364
-	     (rnp) < &(rsp)->node[rcu_num_nodes]; (rnp)++)
339
+#define rcu_for_each_leaf_node(rnp) \
340
+	for ((rnp) = rcu_first_leaf_node(); \
341
+	     (rnp) < &rcu_state.node[rcu_num_nodes]; (rnp)++)
365342 
366343 /*
367344  * Iterate over all possible CPUs in a leaf RCU node.
368345  */
369346 #define for_each_leaf_node_possible_cpu(rnp, cpu) \
370
-	for ((cpu) = cpumask_next((rnp)->grplo - 1, cpu_possible_mask); \
347
+	for (WARN_ON_ONCE(!rcu_is_leaf_node(rnp)), \
348
+	     (cpu) = cpumask_next((rnp)->grplo - 1, cpu_possible_mask); \
371349 	     (cpu) <= rnp->grphi; \
372350 	     (cpu) = cpumask_next((cpu), cpu_possible_mask))
373351 
....@@ -377,7 +355,8 @@
377355 #define rcu_find_next_bit(rnp, cpu, mask) \
378356 	((rnp)->grplo + find_next_bit(&(mask), BITS_PER_LONG, (cpu)))
379357 #define for_each_leaf_node_cpu_mask(rnp, cpu, mask) \
380
-	for ((cpu) = rcu_find_next_bit((rnp), 0, (mask)); \
358
+	for (WARN_ON_ONCE(!rcu_is_leaf_node(rnp)), \
359
+	     (cpu) = rcu_find_next_bit((rnp), 0, (mask)); \
381360 	     (cpu) <= rnp->grphi; \
382361 	     (cpu) = rcu_find_next_bit((rnp), (cpu) + 1 - (rnp->grplo), (mask)))
383362 
....@@ -433,7 +412,13 @@
433412 #define raw_lockdep_assert_held_rcu_node(p)				\
434413 	lockdep_assert_held(&ACCESS_PRIVATE(p, lock))
435414 
436
-#endif /* #if defined(SRCU) || !defined(TINY_RCU) */
415
+#endif /* #if defined(CONFIG_SRCU) || !defined(CONFIG_TINY_RCU) */
416
+
417
+#ifdef CONFIG_SRCU
418
+void srcu_init(void);
419
+#else /* #ifdef CONFIG_SRCU */
420
+static inline void srcu_init(void) { }
421
+#endif /* #else #ifdef CONFIG_SRCU */
437422 
438423 #ifdef CONFIG_TINY_RCU
439424 /* Tiny RCU doesn't expedite, as its purpose in life is instead to be tiny. */
....@@ -448,6 +433,7 @@
448433 void rcu_expedite_gp(void);
449434 void rcu_unexpedite_gp(void);
450435 void rcupdate_announce_bootup_oddness(void);
436
+void show_rcu_tasks_gp_kthreads(void);
451437 void rcu_request_urgent_qs_task(struct task_struct *t);
452438 #endif /* #else #ifdef CONFIG_TINY_RCU */
453439 
....@@ -457,22 +443,23 @@
457443 
458444 enum rcutorture_type {
459445 	RCU_FLAVOR,
460
-	RCU_BH_FLAVOR,
461
-	RCU_SCHED_FLAVOR,
462446 	RCU_TASKS_FLAVOR,
447
+	RCU_TASKS_RUDE_FLAVOR,
448
+	RCU_TASKS_TRACING_FLAVOR,
449
+	RCU_TRIVIAL_FLAVOR,
463450 	SRCU_FLAVOR,
464451 	INVALID_RCU_FLAVOR
465452 };
466453 
467
-#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
454
+#if defined(CONFIG_TREE_RCU)
468455 void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
469456 			    unsigned long *gp_seq);
470
-void rcutorture_record_progress(unsigned long vernum);
471457 void do_trace_rcu_torture_read(const char *rcutorturename,
472458 			       struct rcu_head *rhp,
473459 			       unsigned long secs,
474460 			       unsigned long c_old,
475461 			       unsigned long c);
462
+void rcu_gp_set_torture_wait(int duration);
476463 #else
477464 static inline void rcutorture_get_gp_data(enum rcutorture_type test_type,
478465 					  int *flags, unsigned long *gp_seq)
....@@ -480,7 +467,6 @@
480467 	*flags = 0;
481468 	*gp_seq = 0;
482469 }
483
-static inline void rcutorture_record_progress(unsigned long vernum) { }
484470 #ifdef CONFIG_RCU_TRACE
485471 void do_trace_rcu_torture_read(const char *rcutorturename,
486472 			       struct rcu_head *rhp,
....@@ -491,6 +477,11 @@
491477 #define do_trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
492478 	do { } while (0)
493479 #endif
480
+static inline void rcu_gp_set_torture_wait(int duration) { }
481
+#endif
482
+
483
+#if IS_ENABLED(CONFIG_RCU_TORTURE_TEST) || IS_MODULE(CONFIG_RCU_TORTURE_TEST)
484
+long rcutorture_sched_setaffinity(pid_t pid, const struct cpumask *in_mask);
494485 #endif
495486 
496487 #ifdef CONFIG_TINY_SRCU
....@@ -514,38 +505,34 @@
514505 #endif
515506 
516507 #ifdef CONFIG_TINY_RCU
508
+static inline bool rcu_dynticks_zero_in_eqs(int cpu, int *vp) { return false; }
517509 static inline unsigned long rcu_get_gp_seq(void) { return 0; }
518
-static inline unsigned long rcu_bh_get_gp_seq(void) { return 0; }
519
-static inline unsigned long rcu_sched_get_gp_seq(void) { return 0; }
520510 static inline unsigned long rcu_exp_batches_completed(void) { return 0; }
521
-static inline unsigned long rcu_exp_batches_completed_sched(void) { return 0; }
522511 static inline unsigned long
523512 srcu_batches_completed(struct srcu_struct *sp) { return 0; }
524513 static inline void rcu_force_quiescent_state(void) { }
525
-static inline void rcu_bh_force_quiescent_state(void) { }
526
-static inline void rcu_sched_force_quiescent_state(void) { }
527514 static inline void show_rcu_gp_kthreads(void) { }
528515 static inline int rcu_get_gp_kthreads_prio(void) { return 0; }
516
+static inline void rcu_fwd_progress_check(unsigned long j) { }
529517 #else /* #ifdef CONFIG_TINY_RCU */
518
+bool rcu_dynticks_zero_in_eqs(int cpu, int *vp);
530519 unsigned long rcu_get_gp_seq(void);
531
-unsigned long rcu_bh_get_gp_seq(void);
532
-unsigned long rcu_sched_get_gp_seq(void);
533520 unsigned long rcu_exp_batches_completed(void);
534
-unsigned long rcu_exp_batches_completed_sched(void);
535521 unsigned long srcu_batches_completed(struct srcu_struct *sp);
536522 void show_rcu_gp_kthreads(void);
537523 int rcu_get_gp_kthreads_prio(void);
524
+void rcu_fwd_progress_check(unsigned long j);
538525 void rcu_force_quiescent_state(void);
539
-void rcu_bh_force_quiescent_state(void);
540
-void rcu_sched_force_quiescent_state(void);
541526 extern struct workqueue_struct *rcu_gp_wq;
542527 extern struct workqueue_struct *rcu_par_gp_wq;
543528 #endif /* #else #ifdef CONFIG_TINY_RCU */
544529 
545530 #ifdef CONFIG_RCU_NOCB_CPU
546531 bool rcu_is_nocb_cpu(int cpu);
532
+void rcu_bind_current_to_nocb(void);
547533 #else
548534 static inline bool rcu_is_nocb_cpu(int cpu) { return false; }
535
+static inline void rcu_bind_current_to_nocb(void) { }
549536 #endif
550537 
551538 #endif /* __LINUX_RCU_H */