smp.c (15c42e5a1f0bccb69508059b8ae0720840068b8e) smp.c (fb1c8f93d869b34cacb8b8932e2b83d96a19d720)
1/*
2 * linux/arch/alpha/kernel/smp.c
3 *
4 * 2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com)
5 * Renamed modified smp_call_function to smp_call_function_on_cpu()
6 * Created an function that conforms to the old calling convention
7 * of smp_call_function().
8 *

--- 975 unchanged lines hidden (view full) ---

984 }
985
986 if (smp_call_function(ipi_flush_icache_page, mm, 1, 1)) {
987 printk(KERN_CRIT "flush_icache_page: timed out\n");
988 }
989
990 preempt_enable();
991}
1/*
2 * linux/arch/alpha/kernel/smp.c
3 *
4 * 2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com)
5 * Renamed modified smp_call_function to smp_call_function_on_cpu()
6 * Created an function that conforms to the old calling convention
7 * of smp_call_function().
8 *

--- 975 unchanged lines hidden (view full) ---

984 }
985
986 if (smp_call_function(ipi_flush_icache_page, mm, 1, 1)) {
987 printk(KERN_CRIT "flush_icache_page: timed out\n");
988 }
989
990 preempt_enable();
991}
992
993#ifdef CONFIG_DEBUG_SPINLOCK
994void
995_raw_spin_unlock(spinlock_t * lock)
996{
997 mb();
998 lock->lock = 0;
999
1000 lock->on_cpu = -1;
1001 lock->previous = NULL;
1002 lock->task = NULL;
1003 lock->base_file = "none";
1004 lock->line_no = 0;
1005}
1006
1007void
1008debug_spin_lock(spinlock_t * lock, const char *base_file, int line_no)
1009{
1010 long tmp;
1011 long stuck;
1012 void *inline_pc = __builtin_return_address(0);
1013 unsigned long started = jiffies;
1014 int printed = 0;
1015 int cpu = smp_processor_id();
1016
1017 stuck = 1L << 30;
1018 try_again:
1019
1020 /* Use sub-sections to put the actual loop at the end
1021 of this object file's text section so as to perfect
1022 branch prediction. */
1023 __asm__ __volatile__(
1024 "1: ldl_l %0,%1\n"
1025 " subq %2,1,%2\n"
1026 " blbs %0,2f\n"
1027 " or %0,1,%0\n"
1028 " stl_c %0,%1\n"
1029 " beq %0,3f\n"
1030 "4: mb\n"
1031 ".subsection 2\n"
1032 "2: ldl %0,%1\n"
1033 " subq %2,1,%2\n"
1034 "3: blt %2,4b\n"
1035 " blbs %0,2b\n"
1036 " br 1b\n"
1037 ".previous"
1038 : "=r" (tmp), "=m" (lock->lock), "=r" (stuck)
1039 : "m" (lock->lock), "2" (stuck) : "memory");
1040
1041 if (stuck < 0) {
1042 printk(KERN_WARNING
1043 "%s:%d spinlock stuck in %s at %p(%d)"
1044 " owner %s at %p(%d) %s:%d\n",
1045 base_file, line_no,
1046 current->comm, inline_pc, cpu,
1047 lock->task->comm, lock->previous,
1048 lock->on_cpu, lock->base_file, lock->line_no);
1049 stuck = 1L << 36;
1050 printed = 1;
1051 goto try_again;
1052 }
1053
1054 /* Exiting. Got the lock. */
1055 lock->on_cpu = cpu;
1056 lock->previous = inline_pc;
1057 lock->task = current;
1058 lock->base_file = base_file;
1059 lock->line_no = line_no;
1060
1061 if (printed) {
1062 printk(KERN_WARNING
1063 "%s:%d spinlock grabbed in %s at %p(%d) %ld ticks\n",
1064 base_file, line_no, current->comm, inline_pc,
1065 cpu, jiffies - started);
1066 }
1067}
1068
1069int
1070debug_spin_trylock(spinlock_t * lock, const char *base_file, int line_no)
1071{
1072 int ret;
1073 if ((ret = !test_and_set_bit(0, lock))) {
1074 lock->on_cpu = smp_processor_id();
1075 lock->previous = __builtin_return_address(0);
1076 lock->task = current;
1077 } else {
1078 lock->base_file = base_file;
1079 lock->line_no = line_no;
1080 }
1081 return ret;
1082}
1083#endif /* CONFIG_DEBUG_SPINLOCK */
1084
1085#ifdef CONFIG_DEBUG_RWLOCK
1086void _raw_write_lock(rwlock_t * lock)
1087{
1088 long regx, regy;
1089 int stuck_lock, stuck_reader;
1090 void *inline_pc = __builtin_return_address(0);
1091
1092 try_again:
1093
1094 stuck_lock = 1<<30;
1095 stuck_reader = 1<<30;
1096
1097 __asm__ __volatile__(
1098 "1: ldl_l %1,%0\n"
1099 " blbs %1,6f\n"
1100 " blt %1,8f\n"
1101 " mov 1,%1\n"
1102 " stl_c %1,%0\n"
1103 " beq %1,6f\n"
1104 "4: mb\n"
1105 ".subsection 2\n"
1106 "6: blt %3,4b # debug\n"
1107 " subl %3,1,%3 # debug\n"
1108 " ldl %1,%0\n"
1109 " blbs %1,6b\n"
1110 "8: blt %4,4b # debug\n"
1111 " subl %4,1,%4 # debug\n"
1112 " ldl %1,%0\n"
1113 " blt %1,8b\n"
1114 " br 1b\n"
1115 ".previous"
1116 : "=m" (*(volatile int *)lock), "=&r" (regx), "=&r" (regy),
1117 "=&r" (stuck_lock), "=&r" (stuck_reader)
1118 : "m" (*(volatile int *)lock), "3" (stuck_lock), "4" (stuck_reader) : "memory");
1119
1120 if (stuck_lock < 0) {
1121 printk(KERN_WARNING "write_lock stuck at %p\n", inline_pc);
1122 goto try_again;
1123 }
1124 if (stuck_reader < 0) {
1125 printk(KERN_WARNING "write_lock stuck on readers at %p\n",
1126 inline_pc);
1127 goto try_again;
1128 }
1129}
1130
1131void _raw_read_lock(rwlock_t * lock)
1132{
1133 long regx;
1134 int stuck_lock;
1135 void *inline_pc = __builtin_return_address(0);
1136
1137 try_again:
1138
1139 stuck_lock = 1<<30;
1140
1141 __asm__ __volatile__(
1142 "1: ldl_l %1,%0;"
1143 " blbs %1,6f;"
1144 " subl %1,2,%1;"
1145 " stl_c %1,%0;"
1146 " beq %1,6f;"
1147 "4: mb\n"
1148 ".subsection 2\n"
1149 "6: ldl %1,%0;"
1150 " blt %2,4b # debug\n"
1151 " subl %2,1,%2 # debug\n"
1152 " blbs %1,6b;"
1153 " br 1b\n"
1154 ".previous"
1155 : "=m" (*(volatile int *)lock), "=&r" (regx), "=&r" (stuck_lock)
1156 : "m" (*(volatile int *)lock), "2" (stuck_lock) : "memory");
1157
1158 if (stuck_lock < 0) {
1159 printk(KERN_WARNING "read_lock stuck at %p\n", inline_pc);
1160 goto try_again;
1161 }
1162}
1163#endif /* CONFIG_DEBUG_RWLOCK */