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Date: Wed, 01 Jul 2009 17:47:00 +0100
From: David Howells <dhowells@...hat.com>
To: mingo@...e.hu
Cc: torvalds@...l.org, akpm@...ux-foundation.org, paulus@...ba.org,
arnd@...db.de, dhowells@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] FRV: Implement atomic64_t
Implement atomic64_t and its ops for FRV. Tested with the following patch:
diff --git a/arch/frv/kernel/setup.c b/arch/frv/kernel/setup.c
index 55e4fab..086d50d 100644
--- a/arch/frv/kernel/setup.c
+++ b/arch/frv/kernel/setup.c
@@ -746,6 +746,52 @@ static void __init parse_cmdline_early(char *cmdline)
} /* end parse_cmdline_early() */
+static atomic64_t xxx;
+
+static void test_atomic64(void)
+{
+ atomic64_set(&xxx, 0x12300000023LL);
+
+ mb();
+ BUG_ON(atomic64_read(&xxx) != 0x12300000023LL);
+ mb();
+ if (atomic64_inc_return(&xxx) != 0x12300000024LL)
+ BUG();
+ mb();
+ BUG_ON(atomic64_read(&xxx) != 0x12300000024LL);
+ mb();
+ if (atomic64_sub_return(0x36900000050LL, &xxx) != -0x2460000002cLL)
+ BUG();
+ mb();
+ BUG_ON(atomic64_read(&xxx) != -0x2460000002cLL);
+ mb();
+ if (atomic64_dec_return(&xxx) != -0x2460000002dLL)
+ BUG();
+ mb();
+ BUG_ON(atomic64_read(&xxx) != -0x2460000002dLL);
+ mb();
+ if (atomic64_add_return(0x36800000001LL, &xxx) != 0x121ffffffd4LL)
+ BUG();
+ mb();
+ BUG_ON(atomic64_read(&xxx) != 0x121ffffffd4LL);
+ mb();
+ if (atomic64_cmpxchg(&xxx, 0x123456789abcdefLL, 0x121ffffffd4LL) != 0x121ffffffd4LL)
+ BUG();
+ mb();
+ BUG_ON(atomic64_read(&xxx) != 0x121ffffffd4LL);
+ mb();
+ if (atomic64_cmpxchg(&xxx, 0x121ffffffd4LL, 0x123456789abcdefLL) != 0x121ffffffd4LL)
+ BUG();
+ mb();
+ BUG_ON(atomic64_read(&xxx) != 0x123456789abcdefLL);
+ mb();
+ if (atomic64_xchg(&xxx, 0xabcdef123456789LL) != 0x123456789abcdefLL)
+ BUG();
+ mb();
+ BUG_ON(atomic64_read(&xxx) != 0xabcdef123456789LL);
+ mb();
+}
+
/*****************************************************************************/
/*
*
@@ -845,6 +891,8 @@ void __init setup_arch(char **cmdline_p)
// asm volatile("movgs %0,timerd" :: "r"(10000000));
// __set_HSR(0, __get_HSR(0) | HSR0_ETMD);
+ test_atomic64();
+
} /* end setup_arch() */
#if 0
Note that this doesn't cover all the trivial wrappers, but does cover all the
substantial implementations.
Signed-off-by: David Howells <dhowells@...hat.com>
---
arch/frv/include/asm/atomic.h | 53 +++++++++++++
arch/frv/include/asm/system.h | 2 +
arch/frv/kernel/frv_ksyms.c | 4 +
arch/frv/lib/Makefile | 2 -
arch/frv/lib/atomic-ops.S | 3 -
arch/frv/lib/atomic64-ops.S | 162 +++++++++++++++++++++++++++++++++++++++++
6 files changed, 221 insertions(+), 5 deletions(-)
create mode 100644 arch/frv/lib/atomic64-ops.S
diff --git a/arch/frv/include/asm/atomic.h b/arch/frv/include/asm/atomic.h
index 0409d98..cf483d1 100644
--- a/arch/frv/include/asm/atomic.h
+++ b/arch/frv/include/asm/atomic.h
@@ -121,10 +121,57 @@ static inline void atomic_dec(atomic_t *v)
#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
+/*
+ * 64-bit atomic ops
+ */
+typedef struct {
+ volatile long long counter;
+} atomic64_t;
+
+#define ATOMIC64_INIT(i) { (i) }
+#define atomic64_read(v) ((v)->counter)
+#define atomic64_set(v, i) (((v)->counter) = (i))
+
+extern long long atomic64_inc_return(atomic64_t *v);
+extern long long atomic64_dec_return(atomic64_t *v);
+extern long long atomic64_add_return(long long i, atomic64_t *v);
+extern long long atomic64_sub_return(long long i, atomic64_t *v);
+
+static inline long long atomic64_add_negative(long long i, atomic64_t *v)
+{
+ return atomic64_add_return(i, v) < 0;
+}
+
+static inline void atomic64_add(long long i, atomic64_t *v)
+{
+ atomic64_add_return(i, v);
+}
+
+static inline void atomic64_sub(long long i, atomic64_t *v)
+{
+ atomic64_sub_return(i, v);
+}
+
+static inline void atomic64_inc(atomic64_t *v)
+{
+ atomic64_inc_return(v);
+}
+
+static inline void atomic64_dec(atomic64_t *v)
+{
+ atomic64_dec_return(v);
+}
+
+#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
+#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
+#define atomic64_inc_and_test(v) (atomic64_inc_return((v)) == 0)
+
/*****************************************************************************/
/*
* exchange value with memory
*/
+extern uint64_t __xchg_64(uint64_t i, volatile void *v);
+
#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
#define xchg(ptr, x) \
@@ -174,8 +221,10 @@ extern uint32_t __xchg_32(uint32_t i, volatile void *v);
#define tas(ptr) (xchg((ptr), 1))
-#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+#define atomic_cmpxchg(v, old, new) (cmpxchg(&(v)->counter, old, new))
+#define atomic_xchg(v, new) (xchg(&(v)->counter, new))
+#define atomic64_cmpxchg(v, old, new) (__cmpxchg_64(old, new, &(v)->counter))
+#define atomic64_xchg(v, new) (__xchg_64(new, &(v)->counter))
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
{
diff --git a/arch/frv/include/asm/system.h b/arch/frv/include/asm/system.h
index 7742ec0..efd22d9 100644
--- a/arch/frv/include/asm/system.h
+++ b/arch/frv/include/asm/system.h
@@ -208,6 +208,8 @@ extern void free_initmem(void);
* - if (*ptr == test) then orig = *ptr; *ptr = test;
* - if (*ptr != test) then orig = *ptr;
*/
+extern uint64_t __cmpxchg_64(uint64_t test, uint64_t new, volatile uint64_t *v);
+
#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
#define cmpxchg(ptr, test, new) \
diff --git a/arch/frv/kernel/frv_ksyms.c b/arch/frv/kernel/frv_ksyms.c
index 0316b3c..a89803b 100644
--- a/arch/frv/kernel/frv_ksyms.c
+++ b/arch/frv/kernel/frv_ksyms.c
@@ -67,6 +67,10 @@ EXPORT_SYMBOL(atomic_sub_return);
EXPORT_SYMBOL(__xchg_32);
EXPORT_SYMBOL(__cmpxchg_32);
#endif
+EXPORT_SYMBOL(atomic64_add_return);
+EXPORT_SYMBOL(atomic64_sub_return);
+EXPORT_SYMBOL(__xchg_64);
+EXPORT_SYMBOL(__cmpxchg_64);
EXPORT_SYMBOL(__debug_bug_printk);
EXPORT_SYMBOL(__delay_loops_MHz);
diff --git a/arch/frv/lib/Makefile b/arch/frv/lib/Makefile
index 08be305..4ff2fb1 100644
--- a/arch/frv/lib/Makefile
+++ b/arch/frv/lib/Makefile
@@ -4,5 +4,5 @@
lib-y := \
__ashldi3.o __lshrdi3.o __muldi3.o __ashrdi3.o __negdi2.o __ucmpdi2.o \
- checksum.o memcpy.o memset.o atomic-ops.o \
+ checksum.o memcpy.o memset.o atomic-ops.o atomic64-ops.o \
outsl_ns.o outsl_sw.o insl_ns.o insl_sw.o cache.o
diff --git a/arch/frv/lib/atomic-ops.S b/arch/frv/lib/atomic-ops.S
index ee0ac90..5e9e6ab 100644
--- a/arch/frv/lib/atomic-ops.S
+++ b/arch/frv/lib/atomic-ops.S
@@ -163,11 +163,10 @@ __cmpxchg_32:
ld.p @(gr11,gr0),gr8
orcr cc7,cc7,cc3
subcc gr8,gr9,gr7,icc0
- bne icc0,#0,1f
+ bnelr icc0,#0
cst.p gr10,@(gr11,gr0) ,cc3,#1
corcc gr29,gr29,gr0 ,cc3,#1
beq icc3,#0,0b
-1:
bralr
.size __cmpxchg_32, .-__cmpxchg_32
diff --git a/arch/frv/lib/atomic64-ops.S b/arch/frv/lib/atomic64-ops.S
new file mode 100644
index 0000000..b6194ee
--- /dev/null
+++ b/arch/frv/lib/atomic64-ops.S
@@ -0,0 +1,162 @@
+/* kernel atomic64 operations
+ *
+ * For an explanation of how atomic ops work in this arch, see:
+ * Documentation/frv/atomic-ops.txt
+ *
+ * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@...hat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/spr-regs.h>
+
+ .text
+ .balign 4
+
+
+###############################################################################
+#
+# long long atomic64_inc_return(atomic64_t *v)
+#
+###############################################################################
+ .globl atomic64_inc_return
+ .type atomic64_inc_return,@function
+atomic64_inc_return:
+ or.p gr8,gr8,gr10
+0:
+ orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */
+ ckeq icc3,cc7
+ ldd.p @(gr10,gr0),gr8 /* LDD.P/ORCR must be atomic */
+ orcr cc7,cc7,cc3 /* set CC3 to true */
+ addicc gr9,#1,gr9,icc0
+ addxi gr8,#0,gr8,icc0
+ cstd.p gr8,@(gr10,gr0) ,cc3,#1
+ corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */
+ beq icc3,#0,0b
+ bralr
+
+ .size atomic64_inc_return, .-atomic64_inc_return
+
+###############################################################################
+#
+# long long atomic64_dec_return(atomic64_t *v)
+#
+###############################################################################
+ .globl atomic64_dec_return
+ .type atomic64_dec_return,@function
+atomic64_dec_return:
+ or.p gr8,gr8,gr10
+0:
+ orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */
+ ckeq icc3,cc7
+ ldd.p @(gr10,gr0),gr8 /* LDD.P/ORCR must be atomic */
+ orcr cc7,cc7,cc3 /* set CC3 to true */
+ subicc gr9,#1,gr9,icc0
+ subxi gr8,#0,gr8,icc0
+ cstd.p gr8,@(gr10,gr0) ,cc3,#1
+ corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */
+ beq icc3,#0,0b
+ bralr
+
+ .size atomic64_dec_return, .-atomic64_dec_return
+
+###############################################################################
+#
+# long long atomic64_add_return(long long i, atomic64_t *v)
+#
+###############################################################################
+ .globl atomic64_add_return
+ .type atomic64_add_return,@function
+atomic64_add_return:
+ or.p gr8,gr8,gr4
+ or gr9,gr9,gr5
+0:
+ orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */
+ ckeq icc3,cc7
+ ldd.p @(gr10,gr0),gr8 /* LDD.P/ORCR must be atomic */
+ orcr cc7,cc7,cc3 /* set CC3 to true */
+ addcc gr9,gr5,gr9,icc0
+ addx gr8,gr4,gr8,icc0
+ cstd.p gr8,@(gr10,gr0) ,cc3,#1
+ corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */
+ beq icc3,#0,0b
+ bralr
+
+ .size atomic64_add_return, .-atomic64_add_return
+
+###############################################################################
+#
+# long long atomic64_sub_return(long long i, atomic64_t *v)
+#
+###############################################################################
+ .globl atomic64_sub_return
+ .type atomic64_sub_return,@function
+atomic64_sub_return:
+ or.p gr8,gr8,gr4
+ or gr9,gr9,gr5
+0:
+ orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */
+ ckeq icc3,cc7
+ ldd.p @(gr10,gr0),gr8 /* LDD.P/ORCR must be atomic */
+ orcr cc7,cc7,cc3 /* set CC3 to true */
+ subcc gr9,gr5,gr9,icc0
+ subx gr8,gr4,gr8,icc0
+ cstd.p gr8,@(gr10,gr0) ,cc3,#1
+ corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */
+ beq icc3,#0,0b
+ bralr
+
+ .size atomic64_sub_return, .-atomic64_sub_return
+
+###############################################################################
+#
+# uint64_t __xchg_64(uint64_t i, uint64_t *v)
+#
+###############################################################################
+ .globl __xchg_64
+ .type __xchg_64,@function
+__xchg_64:
+ or.p gr8,gr8,gr4
+ or gr9,gr9,gr5
+0:
+ orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */
+ ckeq icc3,cc7
+ ldd.p @(gr10,gr0),gr8 /* LDD.P/ORCR must be atomic */
+ orcr cc7,cc7,cc3 /* set CC3 to true */
+ cstd.p gr4,@(gr10,gr0) ,cc3,#1
+ corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */
+ beq icc3,#0,0b
+ bralr
+
+ .size __xchg_64, .-__xchg_64
+
+###############################################################################
+#
+# uint64_t __cmpxchg_64(uint64_t test, uint64_t new, uint64_t *v)
+#
+###############################################################################
+ .globl __cmpxchg_64
+ .type __cmpxchg_64,@function
+__cmpxchg_64:
+ or.p gr8,gr8,gr4
+ or gr9,gr9,gr5
+0:
+ orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */
+ ckeq icc3,cc7
+ ldd.p @(gr12,gr0),gr8 /* LDD.P/ORCR must be atomic */
+ orcr cc7,cc7,cc3
+ subcc gr8,gr4,gr0,icc0
+ subcc.p gr9,gr5,gr0,icc1
+ bnelr icc0,#0
+ bnelr icc1,#0
+ cstd.p gr10,@(gr12,gr0) ,cc3,#1
+ corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */
+ beq icc3,#0,0b
+ bralr
+
+ .size __cmpxchg_64, .-__cmpxchg_64
+
--
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