From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/mips/include/asm/barrier.h | 142 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 arch/mips/include/asm/barrier.h

(limited to 'arch/mips/include/asm/barrier.h')

diff --git a/arch/mips/include/asm/barrier.h b/arch/mips/include/asm/barrier.h
new file mode 100644
index 000000000..49ff172a7
--- /dev/null
+++ b/arch/mips/include/asm/barrier.h
@@ -0,0 +1,142 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 by Ralf Baechle (ralf@linux-mips.org)
+ */
+#ifndef __ASM_BARRIER_H
+#define __ASM_BARRIER_H
+
+#include <asm/addrspace.h>
+#include <asm/sync.h>
+
+static inline void __sync(void)
+{
+	asm volatile(__SYNC(full, always) ::: "memory");
+}
+
+static inline void rmb(void)
+{
+	asm volatile(__SYNC(rmb, always) ::: "memory");
+}
+#define rmb rmb
+
+static inline void wmb(void)
+{
+	asm volatile(__SYNC(wmb, always) ::: "memory");
+}
+#define wmb wmb
+
+#define fast_mb()	__sync()
+
+#define __fast_iob()				\
+	__asm__ __volatile__(			\
+		".set	push\n\t"		\
+		".set	noreorder\n\t"		\
+		"lw	$0,%0\n\t"		\
+		"nop\n\t"			\
+		".set	pop"			\
+		: /* no output */		\
+		: "m" (*(int *)CKSEG1)		\
+		: "memory")
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+# define fast_iob()	do { } while (0)
+#else /* ! CONFIG_CPU_CAVIUM_OCTEON */
+# ifdef CONFIG_SGI_IP28
+#  define fast_iob()				\
+	__asm__ __volatile__(			\
+		".set	push\n\t"		\
+		".set	noreorder\n\t"		\
+		"lw	$0,%0\n\t"		\
+		"sync\n\t"			\
+		"lw	$0,%0\n\t"		\
+		".set	pop"			\
+		: /* no output */		\
+		: "m" (*(int *)CKSEG1ADDR(0x1fa00004)) \
+		: "memory")
+# else
+#  define fast_iob()				\
+	do {					\
+		__sync();			\
+		__fast_iob();			\
+	} while (0)
+# endif
+#endif /* CONFIG_CPU_CAVIUM_OCTEON */
+
+#ifdef CONFIG_CPU_HAS_WB
+
+#include <asm/wbflush.h>
+
+#define mb()		wbflush()
+#define iob()		wbflush()
+
+#else /* !CONFIG_CPU_HAS_WB */
+
+#define mb()		fast_mb()
+#define iob()		fast_iob()
+
+#endif /* !CONFIG_CPU_HAS_WB */
+
+#if defined(CONFIG_WEAK_ORDERING)
+# define __smp_mb()	__sync()
+# define __smp_rmb()	rmb()
+# define __smp_wmb()	wmb()
+#else
+# define __smp_mb()	barrier()
+# define __smp_rmb()	barrier()
+# define __smp_wmb()	barrier()
+#endif
+
+/*
+ * When LL/SC does imply order, it must also be a compiler barrier to avoid the
+ * compiler from reordering where the CPU will not. When it does not imply
+ * order, the compiler is also free to reorder across the LL/SC loop and
+ * ordering will be done by smp_llsc_mb() and friends.
+ */
+#if defined(CONFIG_WEAK_REORDERING_BEYOND_LLSC) && defined(CONFIG_SMP)
+# define __WEAK_LLSC_MB		sync
+# define smp_llsc_mb() \
+	__asm__ __volatile__(__stringify(__WEAK_LLSC_MB) : : :"memory")
+# define __LLSC_CLOBBER
+#else
+# define __WEAK_LLSC_MB
+# define smp_llsc_mb()		do { } while (0)
+# define __LLSC_CLOBBER		"memory"
+#endif
+
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+#define smp_mb__before_llsc() smp_wmb()
+#define __smp_mb__before_llsc() __smp_wmb()
+/* Cause previous writes to become visible on all CPUs as soon as possible */
+#define nudge_writes() __asm__ __volatile__(".set push\n\t"		\
+					    ".set arch=octeon\n\t"	\
+					    "syncw\n\t"			\
+					    ".set pop" : : : "memory")
+#else
+#define smp_mb__before_llsc() smp_llsc_mb()
+#define __smp_mb__before_llsc() smp_llsc_mb()
+#define nudge_writes() mb()
+#endif
+
+/*
+ * In the Loongson3 LL/SC workaround case, all of our LL/SC loops already have
+ * a completion barrier immediately preceding the LL instruction. Therefore we
+ * can skip emitting a barrier from __smp_mb__before_atomic().
+ */
+#ifdef CONFIG_CPU_LOONGSON3_WORKAROUNDS
+# define __smp_mb__before_atomic()
+#else
+# define __smp_mb__before_atomic()	__smp_mb__before_llsc()
+#endif
+
+#define __smp_mb__after_atomic()	smp_llsc_mb()
+
+static inline void sync_ginv(void)
+{
+	asm volatile(__SYNC(ginv, always));
+}
+
+#include <asm-generic/barrier.h>
+
+#endif /* __ASM_BARRIER_H */
-- 
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