+++ /dev/null
-/*
- * mem.spin: Promela code to validate memory barriers with out-of-order memory
- * and out-of-order instruction scheduling.
- *
- * Algorithm verified :
- *
- * alpha = 0;
- * beta = 0;
- * x = 1;
- * y = 1;
- *
- * Process A Process B
- * alpha = 1; beta = 1;
- * mb(); mb();
- * x = beta; y = alpha;
- *
- * if x = 0, then y != 0
- * if y = 0, then x != 0
- *
- * 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 (c) 2009 Mathieu Desnoyers
- */
-
-/* Promela validation variables. */
-
-/*
- * Produced process control and data flow. Updated after each instruction to
- * show which variables are ready. Using one-hot bit encoding per variable to
- * save state space. Used as triggers to execute the instructions having those
- * variables as input. Leaving bits active to inhibit instruction execution.
- * Scheme used to make instruction disabling and automatic dependency fall-back
- * automatic.
- */
-
-#define CONSUME_TOKENS(state, bits, notbits) \
- ((!(state & (notbits))) && (state & (bits)) == (bits))
-
-#define PRODUCE_TOKENS(state, bits) \
- state = state | (bits);
-
-#define CLEAR_TOKENS(state, bits) \
- state = state & ~(bits)
-
-#define NR_PROCS 2
-
-#define get_pid() (_pid)
-
-/*
- * Each process have its own data in cache. Caches are randomly updated.
- * smp_wmb and smp_rmb forces cache updates (write and read), wmb_mb forces
- * both.
- */
-
-#define DECLARE_CACHED_VAR(type, x, v) \
- type mem_##x = v; \
- type cached_##x[NR_PROCS] = v; \
- bit cache_dirty_##x[NR_PROCS] = 0;
-
-#define IS_CACHE_DIRTY(x, id) (cache_dirty_##x[id])
-
-#define READ_CACHED_VAR(x) \
- (cached_##x[get_pid()])
-
-#define WRITE_CACHED_VAR(x, v) \
- atomic { \
- cached_##x[get_pid()] = v; \
- cache_dirty_##x[get_pid()] = 1; \
- }
-
-#define CACHE_WRITE_TO_MEM(x, id) \
- if \
- :: IS_CACHE_DIRTY(x, id) -> \
- mem_##x = cached_##x[id]; \
- cache_dirty_##x[id] = 0; \
- :: else -> \
- skip \
- fi;
-
-#define CACHE_READ_FROM_MEM(x, id) \
- if \
- :: !IS_CACHE_DIRTY(x, id) -> \
- cached_##x[id] = mem_##x; \
- :: else -> \
- skip \
- fi;
-
-/*
- * May update other caches if cache is dirty, or not.
- */
-#define RANDOM_CACHE_WRITE_TO_MEM(x, id) \
- if \
- :: 1 -> CACHE_WRITE_TO_MEM(x, id); \
- :: 1 -> skip \
- fi;
-
-#define RANDOM_CACHE_READ_FROM_MEM(x, id)\
- if \
- :: 1 -> CACHE_READ_FROM_MEM(x, id); \
- :: 1 -> skip \
- fi;
-
-inline ooo_mem()
-{
- atomic {
- RANDOM_CACHE_WRITE_TO_MEM(alpha, get_pid());
- RANDOM_CACHE_WRITE_TO_MEM(beta, get_pid());
- RANDOM_CACHE_READ_FROM_MEM(alpha, get_pid());
- RANDOM_CACHE_READ_FROM_MEM(beta, get_pid());
- }
-}
-
-/* must consume all prior read tokens */
-inline smp_rmb()
-{
- atomic {
- /* todo : consume all read tokens .. ? */
- CACHE_READ_FROM_MEM(alpha, get_pid());
- CACHE_READ_FROM_MEM(beta, get_pid());
- }
-}
-
-/* must consume all prior write tokens */
-inline smp_wmb()
-{
- atomic {
- CACHE_WRITE_TO_MEM(alpha, get_pid());
- CACHE_WRITE_TO_MEM(beta, get_pid());
- }
-}
-
-/* sync_core() must consume all prior read and write tokens, including rmb/wmb
- * tokens */
-
-/* must consume all prior read and write tokens */
-inline smp_mb()
-{
- atomic {
- smp_wmb();
- /* sync_core() */
- smp_rmb();
- }
-}
-
-/* Keep in sync manually with smp_rmb, wmp_wmb and ooo_mem */
-DECLARE_CACHED_VAR(byte, alpha, 0);
-DECLARE_CACHED_VAR(byte, beta, 0);
-
-byte read_one = 1;
-byte read_two = 1;
-
-/*
- * Bit encoding, proc_one_produced :
- */
-
-#define P1_PROD_NONE (1 << 0)
-
-#define P1_WRITE (1 << 1)
-#define P1_WMB (1 << 2)
-#define P1_SYNC_CORE (1 << 3)
-#define P1_RMB (1 << 4)
-#define P1_READ (1 << 5)
-
-int proc_one_produced;
-
-active proctype test_proc_one()
-{
- assert(get_pid() < NR_PROCS);
-
- PRODUCE_TOKENS(proc_one_produced, P1_PROD_NONE);
-
-#ifdef NO_WMB
- PRODUCE_TOKENS(proc_one_produced, P1_WMB);
-#endif
-#ifdef NO_RMB
- PRODUCE_TOKENS(proc_one_produced, P1_RMB);
-#endif
-#ifdef NO_SYNC
- PRODUCE_TOKENS(proc_one_produced, P1_SYNC_CORE);
-#endif
-
- do
- :: CONSUME_TOKENS(proc_one_produced, P1_PROD_NONE, P1_WRITE) ->
- ooo_mem();
- WRITE_CACHED_VAR(alpha, 1);
- ooo_mem();
- PRODUCE_TOKENS(proc_one_produced, P1_WRITE);
- :: CONSUME_TOKENS(proc_one_produced, P1_WRITE, P1_WMB) ->
- smp_wmb();
- PRODUCE_TOKENS(proc_one_produced, P1_WMB);
- :: CONSUME_TOKENS(proc_one_produced, P1_WRITE | P1_WMB, P1_SYNC_CORE) ->
- /* sync_core(); */
- PRODUCE_TOKENS(proc_one_produced, P1_SYNC_CORE);
- :: CONSUME_TOKENS(proc_one_produced, P1_SYNC_CORE, P1_RMB) ->
- smp_rmb();
- PRODUCE_TOKENS(proc_one_produced, P1_RMB);
- :: CONSUME_TOKENS(proc_one_produced, P1_RMB | P1_SYNC_CORE, P1_READ) ->
- ooo_mem();
- read_one = READ_CACHED_VAR(beta);
- ooo_mem();
- PRODUCE_TOKENS(proc_one_produced, P1_READ);
- :: CONSUME_TOKENS(proc_one_produced, P1_PROD_NONE | P1_WRITE
- | P1_WMB | P1_SYNC_CORE | P1_RMB | P1_READ, 0) ->
- break;
- od;
-
- //CLEAR_TOKENS(proc_one_produced,
- // P1_PROD_NONE | P1_WRITE | P1_WMB | P1_SYNC_CORE | P1_RMB |
- // P2_READ);
-
- // test : [] (read_one == 0 -> read_two != 0)
- // test : [] (read_two == 0 -> read_one != 0)
- assert(!(read_one == 0 && read_two == 0));
-}
-
-
-/*
- * Bit encoding, proc_two_produced :
- */
-
-#define P2_PROD_NONE (1 << 0)
-
-#define P2_WRITE (1 << 1)
-#define P2_WMB (1 << 2)
-#define P2_SYNC_CORE (1 << 3)
-#define P2_RMB (1 << 4)
-#define P2_READ (1 << 5)
-
-int proc_two_produced;
-
-active proctype test_proc_two()
-{
- assert(get_pid() < NR_PROCS);
-
- PRODUCE_TOKENS(proc_two_produced, P2_PROD_NONE);
-
-#ifdef NO_WMB
- PRODUCE_TOKENS(proc_two_produced, P2_WMB);
-#endif
-#ifdef NO_RMB
- PRODUCE_TOKENS(proc_two_produced, P2_RMB);
-#endif
-#ifdef NO_SYNC
- PRODUCE_TOKENS(proc_two_produced, P2_SYNC_CORE);
-#endif
-
- do
- :: CONSUME_TOKENS(proc_two_produced, P2_PROD_NONE, P2_WRITE) ->
- ooo_mem();
- WRITE_CACHED_VAR(beta, 1);
- ooo_mem();
- PRODUCE_TOKENS(proc_two_produced, P2_WRITE);
- :: CONSUME_TOKENS(proc_two_produced, P2_WRITE, P2_WMB) ->
- smp_wmb();
- PRODUCE_TOKENS(proc_two_produced, P2_WMB);
- :: CONSUME_TOKENS(proc_two_produced, P2_WRITE | P2_WMB, P2_SYNC_CORE) ->
- /* sync_core(); */
- PRODUCE_TOKENS(proc_two_produced, P2_SYNC_CORE);
- :: CONSUME_TOKENS(proc_two_produced, P2_SYNC_CORE, P2_RMB) ->
- smp_rmb();
- PRODUCE_TOKENS(proc_two_produced, P2_RMB);
- :: CONSUME_TOKENS(proc_two_produced, P2_SYNC_CORE | P2_RMB, P2_READ) ->
- ooo_mem();
- read_two = READ_CACHED_VAR(alpha);
- ooo_mem();
- PRODUCE_TOKENS(proc_two_produced, P2_READ);
- :: CONSUME_TOKENS(proc_two_produced, P2_PROD_NONE | P2_WRITE
- | P2_WMB | P2_SYNC_CORE | P2_RMB | P2_READ, 0) ->
- break;
- od;
-
- //CLEAR_TOKENS(proc_two_produced,
- // P2_PROD_NONE | P2_WRITE | P2_WMB | P2_SYNC_CORE | P2_RMB |
- // P2_READ);
-
- // test : [] (read_one == 0 -> read_two != 0)
- // test : [] (read_two == 0 -> read_one != 0)
- assert(!(read_one == 0 && read_two == 0));
-}
projects / urcu.git / blobdiff