include/linux/rcupreempt_trace.h

   1 /*
   2  * Read-Copy Update mechanism for mutual exclusion (RT implementation)
   3  *
   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, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * Copyright (C) IBM Corporation, 2006
  19  *
  20  * Author:  Paul McKenney <paulmck@us.ibm.com>
  21  *
  22  * Based on the original work by Paul McKenney <paul.mckenney@us.ibm.com>
  23  * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
  24  * Papers:
  25  * http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf
  26  * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001)
  27  *
  28  * For detailed explanation of the Preemptible Read-Copy Update mechanism see -
  29  *               http://lwn.net/Articles/253651/
  30  */
  31
  32 #ifndef __LINUX_RCUPREEMPT_TRACE_H
  33 #define __LINUX_RCUPREEMPT_TRACE_H
  34
  35 #ifdef __KERNEL__
  36 #include <linux/types.h>
  37 #include <linux/kernel.h>
  38
  39 #include <asm/atomic.h>
  40
  41 /*
  42  * PREEMPT_RCU data structures.
  43  */
  44
  45 struct rcupreempt_trace {
  46         long            next_length;
  47         long            next_add;
  48         long            wait_length;
  49         long            wait_add;
  50         long            done_length;
  51         long            done_add;
  52         long            done_remove;
  53         atomic_t        done_invoked;
  54         long            rcu_check_callbacks;
  55         atomic_t        rcu_try_flip_1;
  56         atomic_t        rcu_try_flip_e1;
  57         long            rcu_try_flip_i1;
  58         long            rcu_try_flip_ie1;
  59         long            rcu_try_flip_g1;
  60         long            rcu_try_flip_a1;
  61         long            rcu_try_flip_ae1;
  62         long            rcu_try_flip_a2;
  63         long            rcu_try_flip_z1;
  64         long            rcu_try_flip_ze1;
  65         long            rcu_try_flip_z2;
  66         long            rcu_try_flip_m1;
  67         long            rcu_try_flip_me1;
  68         long            rcu_try_flip_m2;
  69 };
  70
  71 #ifdef CONFIG_RCU_TRACE
  72 #define RCU_TRACE(fn, arg)      fn(arg);
  73 #else
  74 #define RCU_TRACE(fn, arg)
  75 #endif
  76
  77 extern void rcupreempt_trace_move2done(struct rcupreempt_trace *trace);
  78 extern void rcupreempt_trace_move2wait(struct rcupreempt_trace *trace);
  79 extern void rcupreempt_trace_try_flip_1(struct rcupreempt_trace *trace);
  80 extern void rcupreempt_trace_try_flip_e1(struct rcupreempt_trace *trace);
  81 extern void rcupreempt_trace_try_flip_i1(struct rcupreempt_trace *trace);
  82 extern void rcupreempt_trace_try_flip_ie1(struct rcupreempt_trace *trace);
  83 extern void rcupreempt_trace_try_flip_g1(struct rcupreempt_trace *trace);
  84 extern void rcupreempt_trace_try_flip_a1(struct rcupreempt_trace *trace);
  85 extern void rcupreempt_trace_try_flip_ae1(struct rcupreempt_trace *trace);
  86 extern void rcupreempt_trace_try_flip_a2(struct rcupreempt_trace *trace);
  87 extern void rcupreempt_trace_try_flip_z1(struct rcupreempt_trace *trace);
  88 extern void rcupreempt_trace_try_flip_ze1(struct rcupreempt_trace *trace);
  89 extern void rcupreempt_trace_try_flip_z2(struct rcupreempt_trace *trace);
  90 extern void rcupreempt_trace_try_flip_m1(struct rcupreempt_trace *trace);
  91 extern void rcupreempt_trace_try_flip_me1(struct rcupreempt_trace *trace);
  92 extern void rcupreempt_trace_try_flip_m2(struct rcupreempt_trace *trace);
  93 extern void rcupreempt_trace_check_callbacks(struct rcupreempt_trace *trace);
  94 extern void rcupreempt_trace_done_remove(struct rcupreempt_trace *trace);
  95 extern void rcupreempt_trace_invoke(struct rcupreempt_trace *trace);
  96 extern void rcupreempt_trace_next_add(struct rcupreempt_trace *trace);
  97
  98 #endif /* __KERNEL__ */
  99 #endif /* __LINUX_RCUPREEMPT_TRACE_H */