Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 285 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/cmpxchg.h b/arch/arm64/include/asm/cmpxchg.h
new file mode 100644
index 000000000..497acf134
--- /dev/null
+++ b/arch/arm64/include/asm/cmpxchg.h
@@ -0,0 +1,285 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Based on arch/arm/include/asm/cmpxchg.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ */
+#ifndef __ASM_CMPXCHG_H
+#define __ASM_CMPXCHG_H
+
+#include <linux/build_bug.h>
+#include <linux/compiler.h>
+
+#include <asm/barrier.h>
+#include <asm/lse.h>
+
+/*
+ * We need separate acquire parameters for ll/sc and lse, since the full
+ * barrier case is generated as release+dmb for the former and
+ * acquire+release for the latter.
+ */
+#define __XCHG_CASE(w, sfx, name, sz, mb, nop_lse, acq, acq_lse, rel, cl)	\
+static inline u##sz __xchg_case_##name##sz(u##sz x, volatile void *ptr)		\
+{										\
+	u##sz ret;								\
+	unsigned long tmp;							\
+										\
+	asm volatile(ARM64_LSE_ATOMIC_INSN(					\
+	/* LL/SC */								\
+	"	prfm	pstl1strm, %2\n"					\
+	"1:	ld" #acq "xr" #sfx "\t%" #w "0, %2\n"				\
+	"	st" #rel "xr" #sfx "\t%w1, %" #w "3, %2\n"			\
+	"	cbnz	%w1, 1b\n"						\
+	"	" #mb,								\
+	/* LSE atomics */							\
+	"	swp" #acq_lse #rel #sfx "\t%" #w "3, %" #w "0, %2\n"		\
+		__nops(3)							\
+	"	" #nop_lse)							\
+	: "=&r" (ret), "=&r" (tmp), "+Q" (*(u##sz *)ptr)			\
+	: "r" (x)								\
+	: cl);									\
+										\
+	return ret;								\
+}
+
+__XCHG_CASE(w, b,     ,  8,        ,    ,  ,  ,  ,         )
+__XCHG_CASE(w, h,     , 16,        ,    ,  ,  ,  ,         )
+__XCHG_CASE(w,  ,     , 32,        ,    ,  ,  ,  ,         )
+__XCHG_CASE( ,  ,     , 64,        ,    ,  ,  ,  ,         )
+__XCHG_CASE(w, b, acq_,  8,        ,    , a, a,  , "memory")
+__XCHG_CASE(w, h, acq_, 16,        ,    , a, a,  , "memory")
+__XCHG_CASE(w,  , acq_, 32,        ,    , a, a,  , "memory")
+__XCHG_CASE( ,  , acq_, 64,        ,    , a, a,  , "memory")
+__XCHG_CASE(w, b, rel_,  8,        ,    ,  ,  , l, "memory")
+__XCHG_CASE(w, h, rel_, 16,        ,    ,  ,  , l, "memory")
+__XCHG_CASE(w,  , rel_, 32,        ,    ,  ,  , l, "memory")
+__XCHG_CASE( ,  , rel_, 64,        ,    ,  ,  , l, "memory")
+__XCHG_CASE(w, b,  mb_,  8, dmb ish, nop,  , a, l, "memory")
+__XCHG_CASE(w, h,  mb_, 16, dmb ish, nop,  , a, l, "memory")
+__XCHG_CASE(w,  ,  mb_, 32, dmb ish, nop,  , a, l, "memory")
+__XCHG_CASE( ,  ,  mb_, 64, dmb ish, nop,  , a, l, "memory")
+
+#undef __XCHG_CASE
+
+#define __XCHG_GEN(sfx)							\
+static __always_inline  unsigned long __xchg##sfx(unsigned long x,	\
+					volatile void *ptr,		\
+					int size)			\
+{									\
+	switch (size) {							\
+	case 1:								\
+		return __xchg_case##sfx##_8(x, ptr);			\
+	case 2:								\
+		return __xchg_case##sfx##_16(x, ptr);			\
+	case 4:								\
+		return __xchg_case##sfx##_32(x, ptr);			\
+	case 8:								\
+		return __xchg_case##sfx##_64(x, ptr);			\
+	default:							\
+		BUILD_BUG();						\
+	}								\
+									\
+	unreachable();							\
+}
+
+__XCHG_GEN()
+__XCHG_GEN(_acq)
+__XCHG_GEN(_rel)
+__XCHG_GEN(_mb)
+
+#undef __XCHG_GEN
+
+#define __xchg_wrapper(sfx, ptr, x)					\
+({									\
+	__typeof__(*(ptr)) __ret;					\
+	__ret = (__typeof__(*(ptr)))					\
+		__xchg##sfx((unsigned long)(x), (ptr), sizeof(*(ptr))); \
+	__ret;								\
+})
+
+/* xchg */
+#define arch_xchg_relaxed(...)	__xchg_wrapper(    , __VA_ARGS__)
+#define arch_xchg_acquire(...)	__xchg_wrapper(_acq, __VA_ARGS__)
+#define arch_xchg_release(...)	__xchg_wrapper(_rel, __VA_ARGS__)
+#define arch_xchg(...)		__xchg_wrapper( _mb, __VA_ARGS__)
+
+#define __CMPXCHG_CASE(name, sz)			\
+static inline u##sz __cmpxchg_case_##name##sz(volatile void *ptr,	\
+					      u##sz old,		\
+					      u##sz new)		\
+{									\
+	return __lse_ll_sc_body(_cmpxchg_case_##name##sz,		\
+				ptr, old, new);				\
+}
+
+__CMPXCHG_CASE(    ,  8)
+__CMPXCHG_CASE(    , 16)
+__CMPXCHG_CASE(    , 32)
+__CMPXCHG_CASE(    , 64)
+__CMPXCHG_CASE(acq_,  8)
+__CMPXCHG_CASE(acq_, 16)
+__CMPXCHG_CASE(acq_, 32)
+__CMPXCHG_CASE(acq_, 64)
+__CMPXCHG_CASE(rel_,  8)
+__CMPXCHG_CASE(rel_, 16)
+__CMPXCHG_CASE(rel_, 32)
+__CMPXCHG_CASE(rel_, 64)
+__CMPXCHG_CASE(mb_,  8)
+__CMPXCHG_CASE(mb_, 16)
+__CMPXCHG_CASE(mb_, 32)
+__CMPXCHG_CASE(mb_, 64)
+
+#undef __CMPXCHG_CASE
+
+#define __CMPXCHG_DBL(name)						\
+static inline long __cmpxchg_double##name(unsigned long old1,		\
+					 unsigned long old2,		\
+					 unsigned long new1,		\
+					 unsigned long new2,		\
+					 volatile void *ptr)		\
+{									\
+	return __lse_ll_sc_body(_cmpxchg_double##name, 			\
+				old1, old2, new1, new2, ptr);		\
+}
+
+__CMPXCHG_DBL(   )
+__CMPXCHG_DBL(_mb)
+
+#undef __CMPXCHG_DBL
+
+#define __CMPXCHG_GEN(sfx)						\
+static __always_inline unsigned long __cmpxchg##sfx(volatile void *ptr,	\
+					   unsigned long old,		\
+					   unsigned long new,		\
+					   int size)			\
+{									\
+	switch (size) {							\
+	case 1:								\
+		return __cmpxchg_case##sfx##_8(ptr, old, new);		\
+	case 2:								\
+		return __cmpxchg_case##sfx##_16(ptr, old, new);		\
+	case 4:								\
+		return __cmpxchg_case##sfx##_32(ptr, old, new);		\
+	case 8:								\
+		return __cmpxchg_case##sfx##_64(ptr, old, new);		\
+	default:							\
+		BUILD_BUG();						\
+	}								\
+									\
+	unreachable();							\
+}
+
+__CMPXCHG_GEN()
+__CMPXCHG_GEN(_acq)
+__CMPXCHG_GEN(_rel)
+__CMPXCHG_GEN(_mb)
+
+#undef __CMPXCHG_GEN
+
+#define __cmpxchg_wrapper(sfx, ptr, o, n)				\
+({									\
+	__typeof__(*(ptr)) __ret;					\
+	__ret = (__typeof__(*(ptr)))					\
+		__cmpxchg##sfx((ptr), (unsigned long)(o),		\
+				(unsigned long)(n), sizeof(*(ptr)));	\
+	__ret;								\
+})
+
+/* cmpxchg */
+#define arch_cmpxchg_relaxed(...)	__cmpxchg_wrapper(    , __VA_ARGS__)
+#define arch_cmpxchg_acquire(...)	__cmpxchg_wrapper(_acq, __VA_ARGS__)
+#define arch_cmpxchg_release(...)	__cmpxchg_wrapper(_rel, __VA_ARGS__)
+#define arch_cmpxchg(...)		__cmpxchg_wrapper( _mb, __VA_ARGS__)
+#define arch_cmpxchg_local		arch_cmpxchg_relaxed
+
+/* cmpxchg64 */
+#define arch_cmpxchg64_relaxed		arch_cmpxchg_relaxed
+#define arch_cmpxchg64_acquire		arch_cmpxchg_acquire
+#define arch_cmpxchg64_release		arch_cmpxchg_release
+#define arch_cmpxchg64			arch_cmpxchg
+#define arch_cmpxchg64_local		arch_cmpxchg_local
+
+/* cmpxchg_double */
+#define system_has_cmpxchg_double()     1
+
+#define __cmpxchg_double_check(ptr1, ptr2)					\
+({										\
+	if (sizeof(*(ptr1)) != 8)						\
+		BUILD_BUG();							\
+	VM_BUG_ON((unsigned long *)(ptr2) - (unsigned long *)(ptr1) != 1);	\
+})
+
+#define arch_cmpxchg_double(ptr1, ptr2, o1, o2, n1, n2)				\
+({										\
+	int __ret;								\
+	__cmpxchg_double_check(ptr1, ptr2);					\
+	__ret = !__cmpxchg_double_mb((unsigned long)(o1), (unsigned long)(o2),	\
+				     (unsigned long)(n1), (unsigned long)(n2),	\
+				     ptr1);					\
+	__ret;									\
+})
+
+#define arch_cmpxchg_double_local(ptr1, ptr2, o1, o2, n1, n2)			\
+({										\
+	int __ret;								\
+	__cmpxchg_double_check(ptr1, ptr2);					\
+	__ret = !__cmpxchg_double((unsigned long)(o1), (unsigned long)(o2),	\
+				  (unsigned long)(n1), (unsigned long)(n2),	\
+				  ptr1);					\
+	__ret;									\
+})
+
+#define __CMPWAIT_CASE(w, sfx, sz)					\
+static inline void __cmpwait_case_##sz(volatile void *ptr,		\
+				       unsigned long val)		\
+{									\
+	unsigned long tmp;						\
+									\
+	asm volatile(							\
+	"	sevl\n"							\
+	"	wfe\n"							\
+	"	ldxr" #sfx "\t%" #w "[tmp], %[v]\n"			\
+	"	eor	%" #w "[tmp], %" #w "[tmp], %" #w "[val]\n"	\
+	"	cbnz	%" #w "[tmp], 1f\n"				\
+	"	wfe\n"							\
+	"1:"								\
+	: [tmp] "=&r" (tmp), [v] "+Q" (*(u##sz *)ptr)			\
+	: [val] "r" (val));						\
+}
+
+__CMPWAIT_CASE(w, b, 8);
+__CMPWAIT_CASE(w, h, 16);
+__CMPWAIT_CASE(w,  , 32);
+__CMPWAIT_CASE( ,  , 64);
+
+#undef __CMPWAIT_CASE
+
+#define __CMPWAIT_GEN(sfx)						\
+static __always_inline void __cmpwait##sfx(volatile void *ptr,		\
+				  unsigned long val,			\
+				  int size)				\
+{									\
+	switch (size) {							\
+	case 1:								\
+		return __cmpwait_case##sfx##_8(ptr, (u8)val);		\
+	case 2:								\
+		return __cmpwait_case##sfx##_16(ptr, (u16)val);		\
+	case 4:								\
+		return __cmpwait_case##sfx##_32(ptr, val);		\
+	case 8:								\
+		return __cmpwait_case##sfx##_64(ptr, val);		\
+	default:							\
+		BUILD_BUG();						\
+	}								\
+									\
+	unreachable();							\
+}
+
+__CMPWAIT_GEN()
+
+#undef __CMPWAIT_GEN
+
+#define __cmpwait_relaxed(ptr, val) \
+	__cmpwait((ptr), (unsigned long)(val), sizeof(*(ptr)))
+
+#endif	/* __ASM_CMPXCHG_H */