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yaml --- r: 76167 b: refs/heads/master c: 01c1c66 h: refs/heads/master i: 76165: 6138028 76163: 898dbb8 76159: 8c18aee v: v3
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Paul E. McKenney
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Ingo Molnar
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Jan 25, 2008
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| /* | ||
| * Read-Copy Update mechanism for mutual exclusion (classic version) | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; either version 2 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
| * | ||
| * Copyright IBM Corporation, 2001 | ||
| * | ||
| * Author: Dipankar Sarma <dipankar@in.ibm.com> | ||
| * | ||
| * Based on the original work by Paul McKenney <paulmck@us.ibm.com> | ||
| * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. | ||
| * Papers: | ||
| * http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf | ||
| * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001) | ||
| * | ||
| * For detailed explanation of Read-Copy Update mechanism see - | ||
| * Documentation/RCU | ||
| * | ||
| */ | ||
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| #ifndef __LINUX_RCUCLASSIC_H | ||
| #define __LINUX_RCUCLASSIC_H | ||
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| #ifdef __KERNEL__ | ||
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| #include <linux/cache.h> | ||
| #include <linux/spinlock.h> | ||
| #include <linux/threads.h> | ||
| #include <linux/percpu.h> | ||
| #include <linux/cpumask.h> | ||
| #include <linux/seqlock.h> | ||
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| /* Global control variables for rcupdate callback mechanism. */ | ||
| struct rcu_ctrlblk { | ||
| long cur; /* Current batch number. */ | ||
| long completed; /* Number of the last completed batch */ | ||
| int next_pending; /* Is the next batch already waiting? */ | ||
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| int signaled; | ||
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| spinlock_t lock ____cacheline_internodealigned_in_smp; | ||
| cpumask_t cpumask; /* CPUs that need to switch in order */ | ||
| /* for current batch to proceed. */ | ||
| } ____cacheline_internodealigned_in_smp; | ||
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| /* Is batch a before batch b ? */ | ||
| static inline int rcu_batch_before(long a, long b) | ||
| { | ||
| return (a - b) < 0; | ||
| } | ||
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| /* Is batch a after batch b ? */ | ||
| static inline int rcu_batch_after(long a, long b) | ||
| { | ||
| return (a - b) > 0; | ||
| } | ||
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| /* | ||
| * Per-CPU data for Read-Copy UPdate. | ||
| * nxtlist - new callbacks are added here | ||
| * curlist - current batch for which quiescent cycle started if any | ||
| */ | ||
| struct rcu_data { | ||
| /* 1) quiescent state handling : */ | ||
| long quiescbatch; /* Batch # for grace period */ | ||
| int passed_quiesc; /* User-mode/idle loop etc. */ | ||
| int qs_pending; /* core waits for quiesc state */ | ||
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| /* 2) batch handling */ | ||
| long batch; /* Batch # for current RCU batch */ | ||
| struct rcu_head *nxtlist; | ||
| struct rcu_head **nxttail; | ||
| long qlen; /* # of queued callbacks */ | ||
| struct rcu_head *curlist; | ||
| struct rcu_head **curtail; | ||
| struct rcu_head *donelist; | ||
| struct rcu_head **donetail; | ||
| long blimit; /* Upper limit on a processed batch */ | ||
| int cpu; | ||
| struct rcu_head barrier; | ||
| }; | ||
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| DECLARE_PER_CPU(struct rcu_data, rcu_data); | ||
| DECLARE_PER_CPU(struct rcu_data, rcu_bh_data); | ||
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| /* | ||
| * Increment the quiescent state counter. | ||
| * The counter is a bit degenerated: We do not need to know | ||
| * how many quiescent states passed, just if there was at least | ||
| * one since the start of the grace period. Thus just a flag. | ||
| */ | ||
| static inline void rcu_qsctr_inc(int cpu) | ||
| { | ||
| struct rcu_data *rdp = &per_cpu(rcu_data, cpu); | ||
| rdp->passed_quiesc = 1; | ||
| } | ||
| static inline void rcu_bh_qsctr_inc(int cpu) | ||
| { | ||
| struct rcu_data *rdp = &per_cpu(rcu_bh_data, cpu); | ||
| rdp->passed_quiesc = 1; | ||
| } | ||
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| extern int rcu_pending(int cpu); | ||
| extern int rcu_needs_cpu(int cpu); | ||
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| #ifdef CONFIG_DEBUG_LOCK_ALLOC | ||
| extern struct lockdep_map rcu_lock_map; | ||
| # define rcu_read_acquire() \ | ||
| lock_acquire(&rcu_lock_map, 0, 0, 2, 1, _THIS_IP_) | ||
| # define rcu_read_release() lock_release(&rcu_lock_map, 1, _THIS_IP_) | ||
| #else | ||
| # define rcu_read_acquire() do { } while (0) | ||
| # define rcu_read_release() do { } while (0) | ||
| #endif | ||
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| #define __rcu_read_lock() \ | ||
| do { \ | ||
| preempt_disable(); \ | ||
| __acquire(RCU); \ | ||
| rcu_read_acquire(); \ | ||
| } while (0) | ||
| #define __rcu_read_unlock() \ | ||
| do { \ | ||
| rcu_read_release(); \ | ||
| __release(RCU); \ | ||
| preempt_enable(); \ | ||
| } while (0) | ||
| #define __rcu_read_lock_bh() \ | ||
| do { \ | ||
| local_bh_disable(); \ | ||
| __acquire(RCU_BH); \ | ||
| rcu_read_acquire(); \ | ||
| } while (0) | ||
| #define __rcu_read_unlock_bh() \ | ||
| do { \ | ||
| rcu_read_release(); \ | ||
| __release(RCU_BH); \ | ||
| local_bh_enable(); \ | ||
| } while (0) | ||
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| #define __synchronize_sched() synchronize_rcu() | ||
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| extern void __rcu_init(void); | ||
| extern void rcu_check_callbacks(int cpu, int user); | ||
| extern void rcu_restart_cpu(int cpu); | ||
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| #endif /* __KERNEL__ */ | ||
| #endif /* __LINUX_RCUCLASSIC_H */ |
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