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2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777 
 kernel/arch/xtensa/include/asm/spinlock.h
....@@ -12,188 +12,9 @@
1212 #define _XTENSA_SPINLOCK_H
1313 
1414 #include <asm/barrier.h>
15
-#include <asm/processor.h>
15
+#include <asm/qrwlock.h>
16
+#include <asm/qspinlock.h>
1617 
17
-/*
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- * spinlock
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- *
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- * There is at most one owner of a spinlock.  There are not different
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- * types of spinlock owners like there are for rwlocks (see below).
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- *
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- * When trying to obtain a spinlock, the function "spins" forever, or busy-
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- * waits, until the lock is obtained.  When spinning, presumably some other
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- * owner will soon give up the spinlock making it available to others.  Use
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- * the trylock functions to avoid spinning forever.
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- *
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- * possible values:
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- *
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- *    0         nobody owns the spinlock
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- *    1         somebody owns the spinlock
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- */
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-
34
-#define arch_spin_is_locked(x) ((x)->slock != 0)
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-
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-static inline void arch_spin_lock(arch_spinlock_t *lock)
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-{
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-	unsigned long tmp;
39
-
40
-	__asm__ __volatile__(
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-			"       movi    %0, 0\n"
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-			"       wsr     %0, scompare1\n"
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-			"1:     movi    %0, 1\n"
44
-			"       s32c1i  %0, %1, 0\n"
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-			"       bnez    %0, 1b\n"
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-			: "=&a" (tmp)
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-			: "a" (&lock->slock)
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-			: "memory");
49
-}
50
-
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-/* Returns 1 if the lock is obtained, 0 otherwise. */
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-
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-static inline int arch_spin_trylock(arch_spinlock_t *lock)
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-{
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-	unsigned long tmp;
56
-
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-	__asm__ __volatile__(
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-			"       movi    %0, 0\n"
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-			"       wsr     %0, scompare1\n"
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-			"       movi    %0, 1\n"
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-			"       s32c1i  %0, %1, 0\n"
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-			: "=&a" (tmp)
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-			: "a" (&lock->slock)
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-			: "memory");
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-
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-	return tmp == 0 ? 1 : 0;
67
-}
68
-
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-static inline void arch_spin_unlock(arch_spinlock_t *lock)
70
-{
71
-	unsigned long tmp;
72
-
73
-	__asm__ __volatile__(
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-			"       movi    %0, 0\n"
75
-			"       s32ri   %0, %1, 0\n"
76
-			: "=&a" (tmp)
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-			: "a" (&lock->slock)
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-			: "memory");
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-}
80
-
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-/*
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- * rwlock
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- *
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- * Read-write locks are really a more flexible spinlock.  They allow
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- * multiple readers but only one writer.  Write ownership is exclusive
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- * (i.e., all other readers and writers are blocked from ownership while
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- * there is a write owner).  These rwlocks are unfair to writers.  Writers
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- * can be starved for an indefinite time by readers.
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- *
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- * possible values:
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- *
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- *   0          nobody owns the rwlock
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- *  >0          one or more readers own the rwlock
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- *                (the positive value is the actual number of readers)
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- *  0x80000000  one writer owns the rwlock, no other writers, no readers
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- */
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-
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-static inline void arch_write_lock(arch_rwlock_t *rw)
99
-{
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-	unsigned long tmp;
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-
102
-	__asm__ __volatile__(
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-			"       movi    %0, 0\n"
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-			"       wsr     %0, scompare1\n"
105
-			"1:     movi    %0, 1\n"
106
-			"       slli    %0, %0, 31\n"
107
-			"       s32c1i  %0, %1, 0\n"
108
-			"       bnez    %0, 1b\n"
109
-			: "=&a" (tmp)
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-			: "a" (&rw->lock)
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-			: "memory");
112
-}
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-
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-/* Returns 1 if the lock is obtained, 0 otherwise. */
115
-
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-static inline int arch_write_trylock(arch_rwlock_t *rw)
117
-{
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-	unsigned long tmp;
119
-
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-	__asm__ __volatile__(
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-			"       movi    %0, 0\n"
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-			"       wsr     %0, scompare1\n"
123
-			"       movi    %0, 1\n"
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-			"       slli    %0, %0, 31\n"
125
-			"       s32c1i  %0, %1, 0\n"
126
-			: "=&a" (tmp)
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-			: "a" (&rw->lock)
128
-			: "memory");
129
-
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-	return tmp == 0 ? 1 : 0;
131
-}
132
-
133
-static inline void arch_write_unlock(arch_rwlock_t *rw)
134
-{
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-	unsigned long tmp;
136
-
137
-	__asm__ __volatile__(
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-			"       movi    %0, 0\n"
139
-			"       s32ri   %0, %1, 0\n"
140
-			: "=&a" (tmp)
141
-			: "a" (&rw->lock)
142
-			: "memory");
143
-}
144
-
145
-static inline void arch_read_lock(arch_rwlock_t *rw)
146
-{
147
-	unsigned long tmp;
148
-	unsigned long result;
149
-
150
-	__asm__ __volatile__(
151
-			"1:     l32i    %1, %2, 0\n"
152
-			"       bltz    %1, 1b\n"
153
-			"       wsr     %1, scompare1\n"
154
-			"       addi    %0, %1, 1\n"
155
-			"       s32c1i  %0, %2, 0\n"
156
-			"       bne     %0, %1, 1b\n"
157
-			: "=&a" (result), "=&a" (tmp)
158
-			: "a" (&rw->lock)
159
-			: "memory");
160
-}
161
-
162
-/* Returns 1 if the lock is obtained, 0 otherwise. */
163
-
164
-static inline int arch_read_trylock(arch_rwlock_t *rw)
165
-{
166
-	unsigned long result;
167
-	unsigned long tmp;
168
-
169
-	__asm__ __volatile__(
170
-			"       l32i    %1, %2, 0\n"
171
-			"       addi    %0, %1, 1\n"
172
-			"       bltz    %0, 1f\n"
173
-			"       wsr     %1, scompare1\n"
174
-			"       s32c1i  %0, %2, 0\n"
175
-			"       sub     %0, %0, %1\n"
176
-			"1:\n"
177
-			: "=&a" (result), "=&a" (tmp)
178
-			: "a" (&rw->lock)
179
-			: "memory");
180
-
181
-	return result == 0;
182
-}
183
-
184
-static inline void arch_read_unlock(arch_rwlock_t *rw)
185
-{
186
-	unsigned long tmp1, tmp2;
187
-
188
-	__asm__ __volatile__(
189
-			"1:     l32i    %1, %2, 0\n"
190
-			"       addi    %0, %1, -1\n"
191
-			"       wsr     %1, scompare1\n"
192
-			"       s32c1i  %0, %2, 0\n"
193
-			"       bne     %0, %1, 1b\n"
194
-			: "=&a" (tmp1), "=&a" (tmp2)
195
-			: "a" (&rw->lock)
196
-			: "memory");
197
-}
18
+#define smp_mb__after_spinlock()	smp_mb()
19819 
19920 #endif	/* _XTENSA_SPINLOCK_H */