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151 lines
5.0 KiB
151 lines
5.0 KiB
/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* |
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* RCU segmented callback lists, internal-to-rcu header file |
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* |
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* Copyright IBM Corporation, 2017 |
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* |
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* Authors: Paul E. McKenney <[email protected]> |
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*/ |
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#include <linux/rcu_segcblist.h> |
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/* Return number of callbacks in the specified callback list. */ |
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static inline long rcu_cblist_n_cbs(struct rcu_cblist *rclp) |
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{ |
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return READ_ONCE(rclp->len); |
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} |
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/* Return number of callbacks in segmented callback list by summing seglen. */ |
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long rcu_segcblist_n_segment_cbs(struct rcu_segcblist *rsclp); |
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void rcu_cblist_init(struct rcu_cblist *rclp); |
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void rcu_cblist_enqueue(struct rcu_cblist *rclp, struct rcu_head *rhp); |
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void rcu_cblist_flush_enqueue(struct rcu_cblist *drclp, |
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struct rcu_cblist *srclp, |
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struct rcu_head *rhp); |
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struct rcu_head *rcu_cblist_dequeue(struct rcu_cblist *rclp); |
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/* |
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* Is the specified rcu_segcblist structure empty? |
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* |
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* But careful! The fact that the ->head field is NULL does not |
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* necessarily imply that there are no callbacks associated with |
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* this structure. When callbacks are being invoked, they are |
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* removed as a group. If callback invocation must be preempted, |
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* the remaining callbacks will be added back to the list. Either |
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* way, the counts are updated later. |
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* |
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* So it is often the case that rcu_segcblist_n_cbs() should be used |
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* instead. |
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*/ |
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static inline bool rcu_segcblist_empty(struct rcu_segcblist *rsclp) |
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{ |
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return !READ_ONCE(rsclp->head); |
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} |
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/* Return number of callbacks in segmented callback list. */ |
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static inline long rcu_segcblist_n_cbs(struct rcu_segcblist *rsclp) |
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{ |
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#ifdef CONFIG_RCU_NOCB_CPU |
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return atomic_long_read(&rsclp->len); |
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#else |
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return READ_ONCE(rsclp->len); |
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#endif |
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} |
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static inline void rcu_segcblist_set_flags(struct rcu_segcblist *rsclp, |
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int flags) |
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{ |
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rsclp->flags |= flags; |
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} |
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static inline void rcu_segcblist_clear_flags(struct rcu_segcblist *rsclp, |
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int flags) |
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{ |
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rsclp->flags &= ~flags; |
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} |
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static inline bool rcu_segcblist_test_flags(struct rcu_segcblist *rsclp, |
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int flags) |
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{ |
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return READ_ONCE(rsclp->flags) & flags; |
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} |
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/* |
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* Is the specified rcu_segcblist enabled, for example, not corresponding |
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* to an offline CPU? |
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*/ |
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static inline bool rcu_segcblist_is_enabled(struct rcu_segcblist *rsclp) |
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{ |
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return rcu_segcblist_test_flags(rsclp, SEGCBLIST_ENABLED); |
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} |
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/* Is the specified rcu_segcblist offloaded, or is SEGCBLIST_SOFTIRQ_ONLY set? */ |
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static inline bool rcu_segcblist_is_offloaded(struct rcu_segcblist *rsclp) |
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{ |
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if (IS_ENABLED(CONFIG_RCU_NOCB_CPU) && |
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!rcu_segcblist_test_flags(rsclp, SEGCBLIST_SOFTIRQ_ONLY)) |
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return true; |
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return false; |
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} |
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static inline bool rcu_segcblist_completely_offloaded(struct rcu_segcblist *rsclp) |
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{ |
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int flags = SEGCBLIST_KTHREAD_CB | SEGCBLIST_KTHREAD_GP | SEGCBLIST_OFFLOADED; |
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if (IS_ENABLED(CONFIG_RCU_NOCB_CPU) && (rsclp->flags & flags) == flags) |
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return true; |
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return false; |
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} |
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/* |
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* Are all segments following the specified segment of the specified |
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* rcu_segcblist structure empty of callbacks? (The specified |
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* segment might well contain callbacks.) |
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*/ |
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static inline bool rcu_segcblist_restempty(struct rcu_segcblist *rsclp, int seg) |
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{ |
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return !READ_ONCE(*READ_ONCE(rsclp->tails[seg])); |
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} |
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/* |
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* Is the specified segment of the specified rcu_segcblist structure |
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* empty of callbacks? |
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*/ |
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static inline bool rcu_segcblist_segempty(struct rcu_segcblist *rsclp, int seg) |
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{ |
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if (seg == RCU_DONE_TAIL) |
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return &rsclp->head == rsclp->tails[RCU_DONE_TAIL]; |
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return rsclp->tails[seg - 1] == rsclp->tails[seg]; |
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} |
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void rcu_segcblist_inc_len(struct rcu_segcblist *rsclp); |
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void rcu_segcblist_add_len(struct rcu_segcblist *rsclp, long v); |
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void rcu_segcblist_init(struct rcu_segcblist *rsclp); |
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void rcu_segcblist_disable(struct rcu_segcblist *rsclp); |
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void rcu_segcblist_offload(struct rcu_segcblist *rsclp, bool offload); |
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bool rcu_segcblist_ready_cbs(struct rcu_segcblist *rsclp); |
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bool rcu_segcblist_pend_cbs(struct rcu_segcblist *rsclp); |
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struct rcu_head *rcu_segcblist_first_cb(struct rcu_segcblist *rsclp); |
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struct rcu_head *rcu_segcblist_first_pend_cb(struct rcu_segcblist *rsclp); |
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bool rcu_segcblist_nextgp(struct rcu_segcblist *rsclp, unsigned long *lp); |
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void rcu_segcblist_enqueue(struct rcu_segcblist *rsclp, |
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struct rcu_head *rhp); |
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bool rcu_segcblist_entrain(struct rcu_segcblist *rsclp, |
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struct rcu_head *rhp); |
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void rcu_segcblist_extract_done_cbs(struct rcu_segcblist *rsclp, |
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struct rcu_cblist *rclp); |
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void rcu_segcblist_extract_pend_cbs(struct rcu_segcblist *rsclp, |
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struct rcu_cblist *rclp); |
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void rcu_segcblist_insert_count(struct rcu_segcblist *rsclp, |
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struct rcu_cblist *rclp); |
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void rcu_segcblist_insert_done_cbs(struct rcu_segcblist *rsclp, |
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struct rcu_cblist *rclp); |
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void rcu_segcblist_insert_pend_cbs(struct rcu_segcblist *rsclp, |
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struct rcu_cblist *rclp); |
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void rcu_segcblist_advance(struct rcu_segcblist *rsclp, unsigned long seq); |
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bool rcu_segcblist_accelerate(struct rcu_segcblist *rsclp, unsigned long seq); |
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void rcu_segcblist_merge(struct rcu_segcblist *dst_rsclp, |
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struct rcu_segcblist *src_rsclp);
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