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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [RFC PATCH v2 08/15] xen/arm64: port Linux's arm64 atomic_ll_sc.h to Xen
From: Ash Wilding <ash.j.wilding@xxxxxxxxx>
Most of the "work" here is simply deleting the atomic64_t helper
definitions as we don't have an atomic64_t type in Xen.
Signed-off-by: Ash Wilding <ash.j.wilding@xxxxxxxxx>
---
xen/include/asm-arm/arm64/atomic_ll_sc.h | 134 +----------------------
1 file changed, 6 insertions(+), 128 deletions(-)
diff --git a/xen/include/asm-arm/arm64/atomic_ll_sc.h
b/xen/include/asm-arm/arm64/atomic_ll_sc.h
index e1009c0f94..20b0cb174e 100644
--- a/xen/include/asm-arm/arm64/atomic_ll_sc.h
+++ b/xen/include/asm-arm/arm64/atomic_ll_sc.h
@@ -1,16 +1,16 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
/*
- * Based on arch/arm/include/asm/atomic.h
+ * Taken from Linux 5.10-rc2 (last commit 3cea11cd5)
*
* Copyright (C) 1996 Russell King.
* Copyright (C) 2002 Deep Blue Solutions Ltd.
* Copyright (C) 2012 ARM Ltd.
+ * SPDX-License-Identifier: GPL-2.0-only
*/
-#ifndef __ASM_ATOMIC_LL_SC_H
-#define __ASM_ATOMIC_LL_SC_H
+#ifndef __ASM_ARM_ARM64_ATOMIC_LL_SC_H
+#define __ASM_ARM_ARM64_ATOMIC_LL_SC_H
-#include <linux/stringify.h>
+#include <xen/stringify.h>
#ifdef CONFIG_ARM64_LSE_ATOMICS
#define __LL_SC_FALLBACK(asm_ops) \
@@ -134,128 +134,6 @@ ATOMIC_OPS(andnot, bic, )
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP
-#define ATOMIC64_OP(op, asm_op, constraint) \
-static inline void \
-__ll_sc_atomic64_##op(s64 i, atomic64_t *v) \
-{ \
- s64 result; \
- unsigned long tmp; \
- \
- asm volatile("// atomic64_" #op "\n" \
- __LL_SC_FALLBACK( \
-" prfm pstl1strm, %2\n" \
-"1: ldxr %0, %2\n" \
-" " #asm_op " %0, %0, %3\n" \
-" stxr %w1, %0, %2\n" \
-" cbnz %w1, 1b") \
- : "=&r" (result), "=&r" (tmp), "+Q" (v->counter) \
- : __stringify(constraint) "r" (i)); \
-}
-
-#define ATOMIC64_OP_RETURN(name, mb, acq, rel, cl, op, asm_op, constraint)\
-static inline long \
-__ll_sc_atomic64_##op##_return##name(s64 i, atomic64_t *v) \
-{ \
- s64 result; \
- unsigned long tmp; \
- \
- asm volatile("// atomic64_" #op "_return" #name "\n" \
- __LL_SC_FALLBACK( \
-" prfm pstl1strm, %2\n" \
-"1: ld" #acq "xr %0, %2\n" \
-" " #asm_op " %0, %0, %3\n" \
-" st" #rel "xr %w1, %0, %2\n" \
-" cbnz %w1, 1b\n" \
-" " #mb ) \
- : "=&r" (result), "=&r" (tmp), "+Q" (v->counter) \
- : __stringify(constraint) "r" (i) \
- : cl); \
- \
- return result; \
-}
-
-#define ATOMIC64_FETCH_OP(name, mb, acq, rel, cl, op, asm_op, constraint)\
-static inline long \
-__ll_sc_atomic64_fetch_##op##name(s64 i, atomic64_t *v) \
-{ \
- s64 result, val; \
- unsigned long tmp; \
- \
- asm volatile("// atomic64_fetch_" #op #name "\n" \
- __LL_SC_FALLBACK( \
-" prfm pstl1strm, %3\n" \
-"1: ld" #acq "xr %0, %3\n" \
-" " #asm_op " %1, %0, %4\n" \
-" st" #rel "xr %w2, %1, %3\n" \
-" cbnz %w2, 1b\n" \
-" " #mb ) \
- : "=&r" (result), "=&r" (val), "=&r" (tmp), "+Q" (v->counter) \
- : __stringify(constraint) "r" (i) \
- : cl); \
- \
- return result; \
-}
-
-#define ATOMIC64_OPS(...) \
- ATOMIC64_OP(__VA_ARGS__) \
- ATOMIC64_OP_RETURN(, dmb ish, , l, "memory", __VA_ARGS__) \
- ATOMIC64_OP_RETURN(_relaxed,, , , , __VA_ARGS__) \
- ATOMIC64_OP_RETURN(_acquire,, a, , "memory", __VA_ARGS__) \
- ATOMIC64_OP_RETURN(_release,, , l, "memory", __VA_ARGS__) \
- ATOMIC64_FETCH_OP (, dmb ish, , l, "memory", __VA_ARGS__) \
- ATOMIC64_FETCH_OP (_relaxed,, , , , __VA_ARGS__) \
- ATOMIC64_FETCH_OP (_acquire,, a, , "memory", __VA_ARGS__) \
- ATOMIC64_FETCH_OP (_release,, , l, "memory", __VA_ARGS__)
-
-ATOMIC64_OPS(add, add, I)
-ATOMIC64_OPS(sub, sub, J)
-
-#undef ATOMIC64_OPS
-#define ATOMIC64_OPS(...) \
- ATOMIC64_OP(__VA_ARGS__) \
- ATOMIC64_FETCH_OP (, dmb ish, , l, "memory", __VA_ARGS__) \
- ATOMIC64_FETCH_OP (_relaxed,, , , , __VA_ARGS__) \
- ATOMIC64_FETCH_OP (_acquire,, a, , "memory", __VA_ARGS__) \
- ATOMIC64_FETCH_OP (_release,, , l, "memory", __VA_ARGS__)
-
-ATOMIC64_OPS(and, and, L)
-ATOMIC64_OPS(or, orr, L)
-ATOMIC64_OPS(xor, eor, L)
-/*
- * GAS converts the mysterious and undocumented BIC (immediate) alias to
- * an AND (immediate) instruction with the immediate inverted. We don't
- * have a constraint for this, so fall back to register.
- */
-ATOMIC64_OPS(andnot, bic, )
-
-#undef ATOMIC64_OPS
-#undef ATOMIC64_FETCH_OP
-#undef ATOMIC64_OP_RETURN
-#undef ATOMIC64_OP
-
-static inline s64
-__ll_sc_atomic64_dec_if_positive(atomic64_t *v)
-{
- s64 result;
- unsigned long tmp;
-
- asm volatile("// atomic64_dec_if_positive\n"
- __LL_SC_FALLBACK(
-" prfm pstl1strm, %2\n"
-"1: ldxr %0, %2\n"
-" subs %0, %0, #1\n"
-" b.lt 2f\n"
-" stlxr %w1, %0, %2\n"
-" cbnz %w1, 1b\n"
-" dmb ish\n"
-"2:")
- : "=&r" (result), "=&r" (tmp), "+Q" (v->counter)
- :
- : "cc", "memory");
-
- return result;
-}
-
#define __CMPXCHG_CASE(w, sfx, name, sz, mb, acq, rel, cl, constraint) \
static inline u##sz \
__ll_sc__cmpxchg_case_##name##sz(volatile void *ptr, \
@@ -350,4 +228,4 @@ __CMPXCHG_DBL(_mb, dmb ish, l, "memory")
#undef __CMPXCHG_DBL
#undef K
-#endif /* __ASM_ATOMIC_LL_SC_H */
\ No newline at end of file
+#endif /* __ASM_ARM_ARM64_ATOMIC_LL_SC_H */
\ No newline at end of file
--
2.24.3 (Apple Git-128)
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