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authorStefan Kristiansson <stefan.kristiansson@saunalahti.fi>2014-05-13 18:01:21 +0300
committerStafford Horne <shorne@gmail.com>2017-02-25 04:14:00 +0900
commit11595172537788f0007bfc16590aab18f2b9c40f (patch)
treef1db0dec55a0de2185628d49efdbcbf3297cd840 /arch
parent0e9f9fd20ce931cc2cf0519c56ae33fc74d656ad (diff)
downloadlinux-11595172537788f0007bfc16590aab18f2b9c40f.tar.bz2
openrisc: add cmpxchg and xchg implementations
Optimized version that make use of the l.lwa and l.swa atomic instruction pair. Most openrisc cores provide these instructions now, if not available emulation is provided. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> [shorne@gmail.com: remove OPENRISC_HAVE_INST_LWA_SWA config suggesed by Alan Cox https://lkml.org/lkml/2014/7/23/666] [shorne@gmail.com: fixed unused calculated value compiler warning in define cmpxchg] Signed-off-by: Stafford Horne <shorne@gmail.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/openrisc/include/asm/Kbuild2
-rw-r--r--arch/openrisc/include/asm/cmpxchg.h83
2 files changed, 83 insertions, 2 deletions
diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild
index 6dd177d28c3b..15e6ed526453 100644
--- a/arch/openrisc/include/asm/Kbuild
+++ b/arch/openrisc/include/asm/Kbuild
@@ -10,8 +10,6 @@ generic-y += bugs.h
generic-y += cacheflush.h
generic-y += checksum.h
generic-y += clkdev.h
-generic-y += cmpxchg-local.h
-generic-y += cmpxchg.h
generic-y += cputime.h
generic-y += current.h
generic-y += device.h
diff --git a/arch/openrisc/include/asm/cmpxchg.h b/arch/openrisc/include/asm/cmpxchg.h
new file mode 100644
index 000000000000..5fcb9ac72693
--- /dev/null
+++ b/arch/openrisc/include/asm/cmpxchg.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#ifndef __ASM_OPENRISC_CMPXCHG_H
+#define __ASM_OPENRISC_CMPXCHG_H
+
+#include <linux/types.h>
+
+/*
+ * This function doesn't exist, so you'll get a linker error
+ * if something tries to do an invalid cmpxchg().
+ */
+extern void __cmpxchg_called_with_bad_pointer(void);
+
+#define __HAVE_ARCH_CMPXCHG 1
+
+static inline unsigned long
+__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
+{
+ if (size != 4) {
+ __cmpxchg_called_with_bad_pointer();
+ return old;
+ }
+
+ __asm__ __volatile__(
+ "1: l.lwa %0, 0(%1) \n"
+ " l.sfeq %0, %2 \n"
+ " l.bnf 2f \n"
+ " l.nop \n"
+ " l.swa 0(%1), %3 \n"
+ " l.bnf 1b \n"
+ " l.nop \n"
+ "2: \n"
+ : "=&r"(old)
+ : "r"(ptr), "r"(old), "r"(new)
+ : "cc", "memory");
+
+ return old;
+}
+
+#define cmpxchg(ptr, o, n) \
+ ({ \
+ (__typeof__(*(ptr))) __cmpxchg((ptr), \
+ (unsigned long)(o), \
+ (unsigned long)(n), \
+ sizeof(*(ptr))); \
+ })
+
+/*
+ * This function doesn't exist, so you'll get a linker error if
+ * something tries to do an invalidly-sized xchg().
+ */
+extern void __xchg_called_with_bad_pointer(void);
+
+static inline unsigned long __xchg(unsigned long val, volatile void *ptr,
+ int size)
+{
+ if (size != 4) {
+ __xchg_called_with_bad_pointer();
+ return val;
+ }
+
+ __asm__ __volatile__(
+ "1: l.lwa %0, 0(%1) \n"
+ " l.swa 0(%1), %2 \n"
+ " l.bnf 1b \n"
+ " l.nop \n"
+ : "=&r"(val)
+ : "r"(ptr), "r"(val)
+ : "cc", "memory");
+
+ return val;
+}
+
+#define xchg(ptr, with) \
+ ((typeof(*(ptr)))__xchg((unsigned long)(with), (ptr), sizeof(*(ptr))))
+
+#endif /* __ASM_OPENRISC_CMPXCHG_H */