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-rw-r--r--arch/sparc64/lib/debuglocks.c366
1 files changed, 0 insertions, 366 deletions
diff --git a/arch/sparc64/lib/debuglocks.c b/arch/sparc64/lib/debuglocks.c
deleted file mode 100644
index f5f0b5586f0..00000000000
--- a/arch/sparc64/lib/debuglocks.c
+++ /dev/null
@@ -1,366 +0,0 @@
-/* $Id: debuglocks.c,v 1.9 2001/11/17 00:10:48 davem Exp $
- * debuglocks.c: Debugging versions of SMP locking primitives.
- *
- * Copyright (C) 1998 David S. Miller (davem@redhat.com)
- */
-
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/spinlock.h>
-#include <asm/system.h>
-
-#ifdef CONFIG_SMP
-
-static inline void show (char *str, spinlock_t *lock, unsigned long caller)
-{
- int cpu = smp_processor_id();
-
- printk("%s(%p) CPU#%d stuck at %08x, owner PC(%08x):CPU(%x)\n",
- str, lock, cpu, (unsigned int) caller,
- lock->owner_pc, lock->owner_cpu);
-}
-
-static inline void show_read (char *str, rwlock_t *lock, unsigned long caller)
-{
- int cpu = smp_processor_id();
-
- printk("%s(%p) CPU#%d stuck at %08x, writer PC(%08x):CPU(%x)\n",
- str, lock, cpu, (unsigned int) caller,
- lock->writer_pc, lock->writer_cpu);
-}
-
-static inline void show_write (char *str, rwlock_t *lock, unsigned long caller)
-{
- int cpu = smp_processor_id();
- int i;
-
- printk("%s(%p) CPU#%d stuck at %08x\n",
- str, lock, cpu, (unsigned int) caller);
- printk("Writer: PC(%08x):CPU(%x)\n",
- lock->writer_pc, lock->writer_cpu);
- printk("Readers:");
- for (i = 0; i < NR_CPUS; i++)
- if (lock->reader_pc[i])
- printk(" %d[%08x]", i, lock->reader_pc[i]);
- printk("\n");
-}
-
-#undef INIT_STUCK
-#define INIT_STUCK 100000000
-
-void _do_spin_lock(spinlock_t *lock, char *str, unsigned long caller)
-{
- unsigned long val;
- int stuck = INIT_STUCK;
- int cpu = get_cpu();
- int shown = 0;
-
-again:
- __asm__ __volatile__("ldstub [%1], %0"
- : "=r" (val)
- : "r" (&(lock->lock))
- : "memory");
- membar_storeload_storestore();
- if (val) {
- while (lock->lock) {
- if (!--stuck) {
- if (shown++ <= 2)
- show(str, lock, caller);
- stuck = INIT_STUCK;
- }
- rmb();
- }
- goto again;
- }
- lock->owner_pc = ((unsigned int)caller);
- lock->owner_cpu = cpu;
- current->thread.smp_lock_count++;
- current->thread.smp_lock_pc = ((unsigned int)caller);
-
- put_cpu();
-}
-
-int _do_spin_trylock(spinlock_t *lock, unsigned long caller)
-{
- unsigned long val;
- int cpu = get_cpu();
-
- __asm__ __volatile__("ldstub [%1], %0"
- : "=r" (val)
- : "r" (&(lock->lock))
- : "memory");
- membar_storeload_storestore();
- if (!val) {
- lock->owner_pc = ((unsigned int)caller);
- lock->owner_cpu = cpu;
- current->thread.smp_lock_count++;
- current->thread.smp_lock_pc = ((unsigned int)caller);
- }
-
- put_cpu();
-
- return val == 0;
-}
-
-void _do_spin_unlock(spinlock_t *lock)
-{
- lock->owner_pc = 0;
- lock->owner_cpu = NO_PROC_ID;
- membar_storestore_loadstore();
- lock->lock = 0;
- current->thread.smp_lock_count--;
-}
-
-/* Keep INIT_STUCK the same... */
-
-void _do_read_lock(rwlock_t *rw, char *str, unsigned long caller)
-{
- unsigned long val;
- int stuck = INIT_STUCK;
- int cpu = get_cpu();
- int shown = 0;
-
-wlock_again:
- /* Wait for any writer to go away. */
- while (((long)(rw->lock)) < 0) {
- if (!--stuck) {
- if (shown++ <= 2)
- show_read(str, rw, caller);
- stuck = INIT_STUCK;
- }
- rmb();
- }
- /* Try once to increment the counter. */
- __asm__ __volatile__(
-" ldx [%0], %%g1\n"
-" brlz,a,pn %%g1, 2f\n"
-" mov 1, %0\n"
-" add %%g1, 1, %%g7\n"
-" casx [%0], %%g1, %%g7\n"
-" sub %%g1, %%g7, %0\n"
-"2:" : "=r" (val)
- : "0" (&(rw->lock))
- : "g1", "g7", "memory");
- membar_storeload_storestore();
- if (val)
- goto wlock_again;
- rw->reader_pc[cpu] = ((unsigned int)caller);
- current->thread.smp_lock_count++;
- current->thread.smp_lock_pc = ((unsigned int)caller);
-
- put_cpu();
-}
-
-void _do_read_unlock(rwlock_t *rw, char *str, unsigned long caller)
-{
- unsigned long val;
- int stuck = INIT_STUCK;
- int cpu = get_cpu();
- int shown = 0;
-
- /* Drop our identity _first_. */
- rw->reader_pc[cpu] = 0;
- current->thread.smp_lock_count--;
-runlock_again:
- /* Spin trying to decrement the counter using casx. */
- __asm__ __volatile__(
-" membar #StoreLoad | #LoadLoad\n"
-" ldx [%0], %%g1\n"
-" sub %%g1, 1, %%g7\n"
-" casx [%0], %%g1, %%g7\n"
-" membar #StoreLoad | #StoreStore\n"
-" sub %%g1, %%g7, %0\n"
- : "=r" (val)
- : "0" (&(rw->lock))
- : "g1", "g7", "memory");
- if (val) {
- if (!--stuck) {
- if (shown++ <= 2)
- show_read(str, rw, caller);
- stuck = INIT_STUCK;
- }
- goto runlock_again;
- }
-
- put_cpu();
-}
-
-void _do_write_lock(rwlock_t *rw, char *str, unsigned long caller)
-{
- unsigned long val;
- int stuck = INIT_STUCK;
- int cpu = get_cpu();
- int shown = 0;
-
-wlock_again:
- /* Spin while there is another writer. */
- while (((long)rw->lock) < 0) {
- if (!--stuck) {
- if (shown++ <= 2)
- show_write(str, rw, caller);
- stuck = INIT_STUCK;
- }
- rmb();
- }
-
- /* Try to acuire the write bit. */
- __asm__ __volatile__(
-" mov 1, %%g3\n"
-" sllx %%g3, 63, %%g3\n"
-" ldx [%0], %%g1\n"
-" brlz,pn %%g1, 1f\n"
-" or %%g1, %%g3, %%g7\n"
-" casx [%0], %%g1, %%g7\n"
-" membar #StoreLoad | #StoreStore\n"
-" ba,pt %%xcc, 2f\n"
-" sub %%g1, %%g7, %0\n"
-"1: mov 1, %0\n"
-"2:" : "=r" (val)
- : "0" (&(rw->lock))
- : "g3", "g1", "g7", "memory");
- if (val) {
- /* We couldn't get the write bit. */
- if (!--stuck) {
- if (shown++ <= 2)
- show_write(str, rw, caller);
- stuck = INIT_STUCK;
- }
- goto wlock_again;
- }
- if ((rw->lock & ((1UL<<63)-1UL)) != 0UL) {
- /* Readers still around, drop the write
- * lock, spin, and try again.
- */
- if (!--stuck) {
- if (shown++ <= 2)
- show_write(str, rw, caller);
- stuck = INIT_STUCK;
- }
- __asm__ __volatile__(
-" mov 1, %%g3\n"
-" sllx %%g3, 63, %%g3\n"
-"1: ldx [%0], %%g1\n"
-" andn %%g1, %%g3, %%g7\n"
-" casx [%0], %%g1, %%g7\n"
-" cmp %%g1, %%g7\n"
-" membar #StoreLoad | #StoreStore\n"
-" bne,pn %%xcc, 1b\n"
-" nop"
- : /* no outputs */
- : "r" (&(rw->lock))
- : "g3", "g1", "g7", "cc", "memory");
- while(rw->lock != 0) {
- if (!--stuck) {
- if (shown++ <= 2)
- show_write(str, rw, caller);
- stuck = INIT_STUCK;
- }
- rmb();
- }
- goto wlock_again;
- }
-
- /* We have it, say who we are. */
- rw->writer_pc = ((unsigned int)caller);
- rw->writer_cpu = cpu;
- current->thread.smp_lock_count++;
- current->thread.smp_lock_pc = ((unsigned int)caller);
-
- put_cpu();
-}
-
-void _do_write_unlock(rwlock_t *rw, unsigned long caller)
-{
- unsigned long val;
- int stuck = INIT_STUCK;
- int shown = 0;
-
- /* Drop our identity _first_ */
- rw->writer_pc = 0;
- rw->writer_cpu = NO_PROC_ID;
- current->thread.smp_lock_count--;
-wlock_again:
- __asm__ __volatile__(
-" membar #StoreLoad | #LoadLoad\n"
-" mov 1, %%g3\n"
-" sllx %%g3, 63, %%g3\n"
-" ldx [%0], %%g1\n"
-" andn %%g1, %%g3, %%g7\n"
-" casx [%0], %%g1, %%g7\n"
-" membar #StoreLoad | #StoreStore\n"
-" sub %%g1, %%g7, %0\n"
- : "=r" (val)
- : "0" (&(rw->lock))
- : "g3", "g1", "g7", "memory");
- if (val) {
- if (!--stuck) {
- if (shown++ <= 2)
- show_write("write_unlock", rw, caller);
- stuck = INIT_STUCK;
- }
- goto wlock_again;
- }
-}
-
-int _do_write_trylock(rwlock_t *rw, char *str, unsigned long caller)
-{
- unsigned long val;
- int cpu = get_cpu();
-
- /* Try to acuire the write bit. */
- __asm__ __volatile__(
-" mov 1, %%g3\n"
-" sllx %%g3, 63, %%g3\n"
-" ldx [%0], %%g1\n"
-" brlz,pn %%g1, 1f\n"
-" or %%g1, %%g3, %%g7\n"
-" casx [%0], %%g1, %%g7\n"
-" membar #StoreLoad | #StoreStore\n"
-" ba,pt %%xcc, 2f\n"
-" sub %%g1, %%g7, %0\n"
-"1: mov 1, %0\n"
-"2:" : "=r" (val)
- : "0" (&(rw->lock))
- : "g3", "g1", "g7", "memory");
-
- if (val) {
- put_cpu();
- return 0;
- }
-
- if ((rw->lock & ((1UL<<63)-1UL)) != 0UL) {
- /* Readers still around, drop the write
- * lock, return failure.
- */
- __asm__ __volatile__(
-" mov 1, %%g3\n"
-" sllx %%g3, 63, %%g3\n"
-"1: ldx [%0], %%g1\n"
-" andn %%g1, %%g3, %%g7\n"
-" casx [%0], %%g1, %%g7\n"
-" cmp %%g1, %%g7\n"
-" membar #StoreLoad | #StoreStore\n"
-" bne,pn %%xcc, 1b\n"
-" nop"
- : /* no outputs */
- : "r" (&(rw->lock))
- : "g3", "g1", "g7", "cc", "memory");
-
- put_cpu();
-
- return 0;
- }
-
- /* We have it, say who we are. */
- rw->writer_pc = ((unsigned int)caller);
- rw->writer_cpu = cpu;
- current->thread.smp_lock_count++;
- current->thread.smp_lock_pc = ((unsigned int)caller);
-
- put_cpu();
-
- return 1;
-}
-
-#endif /* CONFIG_SMP */
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