152 строки
5.0 KiB
C
152 строки
5.0 KiB
C
/* 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);
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
rsclp->flags |= flags;
|
|
}
|
|
|
|
static inline void rcu_segcblist_clear_flags(struct rcu_segcblist *rsclp,
|
|
int 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 offloaded, or is SEGCBLIST_SOFTIRQ_ONLY set? */
|
|
static inline bool rcu_segcblist_is_offloaded(struct rcu_segcblist *rsclp)
|
|
{
|
|
if (IS_ENABLED(CONFIG_RCU_NOCB_CPU) &&
|
|
!rcu_segcblist_test_flags(rsclp, SEGCBLIST_SOFTIRQ_ONLY))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline bool rcu_segcblist_completely_offloaded(struct rcu_segcblist *rsclp)
|
|
{
|
|
int flags = SEGCBLIST_KTHREAD_CB | SEGCBLIST_KTHREAD_GP | SEGCBLIST_OFFLOADED;
|
|
|
|
if (IS_ENABLED(CONFIG_RCU_NOCB_CPU) && (rsclp->flags & flags) == flags)
|
|
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);
|