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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /kernel/rcu/rcu_segcblist.h | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'kernel/rcu/rcu_segcblist.h')
-rw-r--r-- | kernel/rcu/rcu_segcblist.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/kernel/rcu/rcu_segcblist.h b/kernel/rcu/rcu_segcblist.h new file mode 100644 index 0000000000..4fe877f5f6 --- /dev/null +++ b/kernel/rcu/rcu_segcblist.h @@ -0,0 +1,155 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * RCU segmented callback lists, internal-to-rcu header file + * + * Copyright IBM Corporation, 2017 + * + * Authors: Paul E. McKenney <paulmck@linux.ibm.com> + */ + +#include <linux/rcu_segcblist.h> + +/* Return number of callbacks in the specified callback list. */ +static inline long rcu_cblist_n_cbs(struct rcu_cblist *rclp) +{ + return READ_ONCE(rclp->len); +} + +long rcu_segcblist_get_seglen(struct rcu_segcblist *rsclp, int seg); + +/* Return number of callbacks in segmented callback list by summing seglen. */ +long rcu_segcblist_n_segment_cbs(struct rcu_segcblist *rsclp); + +void rcu_cblist_init(struct rcu_cblist *rclp); +void rcu_cblist_enqueue(struct rcu_cblist *rclp, struct rcu_head *rhp); +void rcu_cblist_flush_enqueue(struct rcu_cblist *drclp, + struct rcu_cblist *srclp, + struct rcu_head *rhp); +struct rcu_head *rcu_cblist_dequeue(struct rcu_cblist *rclp); + +/* + * Is the specified rcu_segcblist structure empty? + * + * But careful! The fact that the ->head field is NULL does not + * necessarily imply that there are no callbacks associated with + * this structure. When callbacks are being invoked, they are + * removed as a group. If callback invocation must be preempted, + * the remaining callbacks will be added back to the list. Either + * way, the counts are updated later. + * + * So it is often the case that rcu_segcblist_n_cbs() should be used + * instead. + */ +static inline bool rcu_segcblist_empty(struct rcu_segcblist *rsclp) +{ + return !READ_ONCE(rsclp->head); +} + +/* Return number of callbacks in segmented callback list. */ +static inline long rcu_segcblist_n_cbs(struct rcu_segcblist *rsclp) +{ +#ifdef CONFIG_RCU_NOCB_CPU + return atomic_long_read(&rsclp->len); +#else + return READ_ONCE(rsclp->len); +#endif +} + +static inline void rcu_segcblist_set_flags(struct rcu_segcblist *rsclp, + int flags) +{ + WRITE_ONCE(rsclp->flags, rsclp->flags | flags); +} + +static inline void rcu_segcblist_clear_flags(struct rcu_segcblist *rsclp, + int flags) +{ + WRITE_ONCE(rsclp->flags, rsclp->flags & ~flags); +} + +static inline bool rcu_segcblist_test_flags(struct rcu_segcblist *rsclp, + int flags) +{ + return READ_ONCE(rsclp->flags) & flags; +} + +/* + * Is the specified rcu_segcblist enabled, for example, not corresponding + * to an offline CPU? + */ +static inline bool rcu_segcblist_is_enabled(struct rcu_segcblist *rsclp) +{ + return rcu_segcblist_test_flags(rsclp, SEGCBLIST_ENABLED); +} + +/* + * Is the specified rcu_segcblist NOCB offloaded (or in the middle of the + * [de]offloading process)? + */ +static inline bool rcu_segcblist_is_offloaded(struct rcu_segcblist *rsclp) +{ + if (IS_ENABLED(CONFIG_RCU_NOCB_CPU) && + rcu_segcblist_test_flags(rsclp, SEGCBLIST_LOCKING)) + return true; + + return false; +} + +static inline bool rcu_segcblist_completely_offloaded(struct rcu_segcblist *rsclp) +{ + if (IS_ENABLED(CONFIG_RCU_NOCB_CPU) && + !rcu_segcblist_test_flags(rsclp, SEGCBLIST_RCU_CORE)) + return true; + + return false; +} + +/* + * Are all segments following the specified segment of the specified + * rcu_segcblist structure empty of callbacks? (The specified + * segment might well contain callbacks.) + */ +static inline bool rcu_segcblist_restempty(struct rcu_segcblist *rsclp, int seg) +{ + return !READ_ONCE(*READ_ONCE(rsclp->tails[seg])); +} + +/* + * Is the specified segment of the specified rcu_segcblist structure + * empty of callbacks? + */ +static inline bool rcu_segcblist_segempty(struct rcu_segcblist *rsclp, int seg) +{ + if (seg == RCU_DONE_TAIL) + return &rsclp->head == rsclp->tails[RCU_DONE_TAIL]; + return rsclp->tails[seg - 1] == rsclp->tails[seg]; +} + +void rcu_segcblist_inc_len(struct rcu_segcblist *rsclp); +void rcu_segcblist_add_len(struct rcu_segcblist *rsclp, long v); +void rcu_segcblist_init(struct rcu_segcblist *rsclp); +void rcu_segcblist_disable(struct rcu_segcblist *rsclp); +void rcu_segcblist_offload(struct rcu_segcblist *rsclp, bool offload); +bool rcu_segcblist_ready_cbs(struct rcu_segcblist *rsclp); +bool rcu_segcblist_pend_cbs(struct rcu_segcblist *rsclp); +struct rcu_head *rcu_segcblist_first_cb(struct rcu_segcblist *rsclp); +struct rcu_head *rcu_segcblist_first_pend_cb(struct rcu_segcblist *rsclp); +bool rcu_segcblist_nextgp(struct rcu_segcblist *rsclp, unsigned long *lp); +void rcu_segcblist_enqueue(struct rcu_segcblist *rsclp, + struct rcu_head *rhp); +bool rcu_segcblist_entrain(struct rcu_segcblist *rsclp, + struct rcu_head *rhp); +void rcu_segcblist_extract_done_cbs(struct rcu_segcblist *rsclp, + struct rcu_cblist *rclp); +void rcu_segcblist_extract_pend_cbs(struct rcu_segcblist *rsclp, + struct rcu_cblist *rclp); +void rcu_segcblist_insert_count(struct rcu_segcblist *rsclp, + struct rcu_cblist *rclp); +void rcu_segcblist_insert_done_cbs(struct rcu_segcblist *rsclp, + struct rcu_cblist *rclp); +void rcu_segcblist_insert_pend_cbs(struct rcu_segcblist *rsclp, + struct rcu_cblist *rclp); +void rcu_segcblist_advance(struct rcu_segcblist *rsclp, unsigned long seq); +bool rcu_segcblist_accelerate(struct rcu_segcblist *rsclp, unsigned long seq); +void rcu_segcblist_merge(struct rcu_segcblist *dst_rsclp, + struct rcu_segcblist *src_rsclp); |