From: Greentime Hu <green.hu@gmail.com>
To: greentime@andestech.com, linux-kernel@vger.kernel.org,
arnd@arndb.de, linux-arch@vger.kernel.org, tglx@linutronix.de,
jason@lakedaemon.net, marc.zyngier@arm.com, robh+dt@kernel.org,
netdev@vger.kernel.org, deanbo422@gmail.com,
devicetree@vger.kernel.org, viro@zeniv.linux.org.uk,
dhowells@redhat.com, will.deacon@arm.com,
daniel.lezcano@linaro.org, linux-serial@vger.kernel.org,
geert.uytterhoeven@gmail.com, linus.walleij@linaro.org,
mark.rutland@arm.com, greg@kroah.com, ren_guo@c-sky.com,
rdunlap@infradead.org, davem@davemloft.net, jonas@southpole.se,
stefan.kristiansson@saunalahti.fi, shorne@gmail.com
Cc: green.hu@gmail.com, Vincent Chen <vincentc@andestech.com>
Subject: [PATCH v6 14/36] nds32: Atomic operations
Date: Mon, 15 Jan 2018 13:53:22 +0800 [thread overview]
Message-ID: <7f2b842dc182f3c042897cb6faf427ce0537a805.1515766253.git.green.hu@gmail.com> (raw)
In-Reply-To: <cover.1515766253.git.green.hu@gmail.com>
In-Reply-To: <cover.1515766253.git.green.hu@gmail.com>
From: Greentime Hu <greentime@andestech.com>
This patch includes the atomic and futex operations. Many atomic operations use
the load-lock word(llw) and store-condition word(scw) operations.
Signed-off-by: Vincent Chen <vincentc@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
---
arch/nds32/include/asm/barrier.h | 15 ++++++
arch/nds32/include/asm/futex.h | 103 ++++++++++++++++++++++++++++++++++++++
2 files changed, 118 insertions(+)
create mode 100644 arch/nds32/include/asm/barrier.h
create mode 100644 arch/nds32/include/asm/futex.h
diff --git a/arch/nds32/include/asm/barrier.h b/arch/nds32/include/asm/barrier.h
new file mode 100644
index 0000000..faafc37
--- /dev/null
+++ b/arch/nds32/include/asm/barrier.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_ASM_BARRIER_H
+#define __NDS32_ASM_BARRIER_H
+
+#ifndef __ASSEMBLY__
+#define mb() asm volatile("msync all":::"memory")
+#define rmb() asm volatile("msync all":::"memory")
+#define wmb() asm volatile("msync store":::"memory")
+#include <asm-generic/barrier.h>
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __NDS32_ASM_BARRIER_H */
diff --git a/arch/nds32/include/asm/futex.h b/arch/nds32/include/asm/futex.h
new file mode 100644
index 0000000..eab5e84
--- /dev/null
+++ b/arch/nds32/include/asm/futex.h
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_FUTEX_H__
+#define __NDS32_FUTEX_H__
+
+#include <linux/futex.h>
+#include <linux/uaccess.h>
+#include <asm/errno.h>
+
+#define __futex_atomic_ex_table(err_reg) \
+ " .pushsection __ex_table,\"a\"\n" \
+ " .align 3\n" \
+ " .long 1b, 4f\n" \
+ " .long 2b, 4f\n" \
+ " .popsection\n" \
+ " .pushsection .fixup,\"ax\"\n" \
+ "4: move %0, " err_reg "\n" \
+ " j 3b\n" \
+ " .popsection"
+
+#define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg) \
+ smp_mb(); \
+ asm volatile( \
+ " movi $ta, #0\n" \
+ "1: llw %1, [%2+$ta]\n" \
+ " " insn "\n" \
+ "2: scw %0, [%2+$ta]\n" \
+ " beqz %0, 1b\n" \
+ " movi %0, #0\n" \
+ "3:\n" \
+ __futex_atomic_ex_table("%4") \
+ : "=&r" (ret), "=&r" (oldval) \
+ : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
+ : "cc", "memory")
+static inline int
+futex_atomic_cmpxchg_inatomic(u32 * uval, u32 __user * uaddr,
+ u32 oldval, u32 newval)
+{
+ int ret = 0;
+ u32 val, tmp, flags;
+
+ if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+ return -EFAULT;
+
+ smp_mb();
+ asm volatile (" movi $ta, #0\n"
+ "1: llw %1, [%6 + $ta]\n"
+ " sub %3, %1, %4\n"
+ " cmovz %2, %5, %3\n"
+ " cmovn %2, %1, %3\n"
+ "2: scw %2, [%6 + $ta]\n"
+ " beqz %2, 1b\n"
+ "3:\n " __futex_atomic_ex_table("%7")
+ :"+&r"(ret), "=&r"(val), "=&r"(tmp), "=&r"(flags)
+ :"r"(oldval), "r"(newval), "r"(uaddr), "i"(-EFAULT)
+ :"$ta", "memory");
+ smp_mb();
+
+ *uval = val;
+ return ret;
+}
+
+static inline int
+arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
+{
+ int oldval = 0, ret;
+
+
+ pagefault_disable();
+ switch (op) {
+ case FUTEX_OP_SET:
+ __futex_atomic_op("move %0, %3", ret, oldval, tmp, uaddr,
+ oparg);
+ break;
+ case FUTEX_OP_ADD:
+ __futex_atomic_op("add %0, %1, %3", ret, oldval, tmp, uaddr,
+ oparg);
+ break;
+ case FUTEX_OP_OR:
+ __futex_atomic_op("or %0, %1, %3", ret, oldval, tmp, uaddr,
+ oparg);
+ break;
+ case FUTEX_OP_ANDN:
+ __futex_atomic_op("and %0, %1, %3", ret, oldval, tmp, uaddr,
+ ~oparg);
+ break;
+ case FUTEX_OP_XOR:
+ __futex_atomic_op("xor %0, %1, %3", ret, oldval, tmp, uaddr,
+ oparg);
+ break;
+ default:
+ ret = -ENOSYS;
+ }
+
+ pagefault_enable();
+
+ if (!ret)
+ *oval = oldval;
+
+ return ret;
+}
+#endif /* __NDS32_FUTEX_H__ */
--
1.7.9.5
next prev parent reply other threads:[~2018-01-15 5:53 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-15 5:53 [PATCH v6 00/36] Andes(nds32) Linux Kernel Port Greentime Hu
2018-01-15 5:53 ` [PATCH v6 01/36] asm-generic/io.h: move ioremap_nocache/ioremap_uc/ioremap_wc/ioremap_wt out of ifndef CONFIG_MMU Greentime Hu
2018-01-15 5:53 ` [PATCH v6 02/36] openrisc: add ioremap_nocache declaration before include asm-generic/io.h and sync ioremap prototype with it Greentime Hu
2018-01-15 13:07 ` Stafford Horne
2018-01-15 13:28 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 03/36] sparc: io: To use the define of ioremap_[nocache|wc|wb] in asm-generic/io.h Greentime Hu
[not found] ` <790e05e9b9675b3f6ef41693a794d1f09795c151.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 9:56 ` Arnd Bergmann
[not found] ` <CAK8P3a2qx5pZmE-=QM5Bwrsib4XcfVac7RQr-QMzEseQ_oBPEA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 12:50 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 04/36] earlycon: add reg-offset to physical address before mapping Greentime Hu
2018-01-18 10:00 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 05/36] nds32: Assembly macros and definitions Greentime Hu
[not found] ` <d36e188c167392994a84c8f52ef0dab90b93ed8d.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:01 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 06/36] nds32: Kernel booting and initialization Greentime Hu
2018-01-18 10:11 ` Arnd Bergmann
[not found] ` <CAK8P3a143yQ72+QGZSxpiFc7p8Hb7PXuCybJBFoLRSBaZ2uw4g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 16:34 ` Greentime Hu
2018-01-19 16:41 ` Arnd Bergmann
[not found] ` <CAK8P3a3UCrMbTn1JMOGKCSV4WRw9T9tU+pey1t6Fzitf2V0Bvw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-22 9:49 ` Greentime Hu
2018-01-22 9:53 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 07/36] nds32: Exception handling Greentime Hu
2018-01-18 10:14 ` Arnd Bergmann
[not found] ` <CAK8P3a1ZZsB7MVZ8sEPzkVcNUJh3-MB_ApmPi+DUF1rc9h8pXg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-24 10:53 ` Vincent Chen
2018-01-24 11:09 ` Arnd Bergmann
2018-01-24 11:10 ` Arnd Bergmann
2018-01-30 10:01 ` Vincent Chen
2018-01-30 13:33 ` Arnd Bergmann
2018-01-30 14:49 ` Greentime Hu
2018-01-30 15:27 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 09/36] nds32: MMU initialization Greentime Hu
2018-01-18 10:16 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 10/36] nds32: MMU fault handling and page table management Greentime Hu
2018-01-18 10:16 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 11/36] nds32: Cache and TLB routines Greentime Hu
[not found] ` <e1f55cfd5a5384967f1c4691bc766edbd06fee1d.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:17 ` Arnd Bergmann
2018-01-15 5:53 ` Greentime Hu [this message]
2018-01-18 10:23 ` [PATCH v6 14/36] nds32: Atomic operations Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 15/36] nds32: Device specific operations Greentime Hu
2018-01-18 10:25 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 16/36] nds32: DMA mapping API Greentime Hu
2018-01-18 10:26 ` Arnd Bergmann
2018-01-23 8:23 ` Greentime Hu
[not found] ` <CAEbi=3cYynvFS2GDzj5Oav_5LtHPdBfBWh9c=mFT0PxeOLX9sQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-23 11:52 ` Greentime Hu
[not found] ` <CAEbi=3d46tXacnnU+RJGMw+KR1O=NaVjO+NW3cxUjAN==V51iw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-24 11:36 ` Arnd Bergmann
2018-01-25 3:45 ` Greentime Hu
2018-01-25 10:42 ` Arnd Bergmann
[not found] ` <CAK8P3a0YrwAXH8n83wf=34zmN44KgJu-JVXfQWhuquNxVmZ8Sw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-25 13:48 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 17/36] nds32: ELF definitions Greentime Hu
2018-01-18 10:27 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 19/36] nds32: VDSO support Greentime Hu
[not found] ` <4a602db0a58cc858515c3c669d5ac34c567b061c.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:28 ` Arnd Bergmann
2018-02-06 7:41 ` Vincent Chen
2018-02-06 8:48 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 20/36] nds32: Signal handling support Greentime Hu
2018-01-18 10:30 ` Arnd Bergmann
[not found] ` <CAK8P3a2HR6be9Fm+o1Oq-V5p51xEiuhbyqkgVWprD5BxuU29xQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-24 0:56 ` Vincent Chen
[not found] ` <CAJsyPhyGpJVQegd7ns9oZOjM=XsGVixCQaH9nT_jOQsSpyRs+g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-24 11:13 ` Arnd Bergmann
2018-02-06 6:39 ` Vincent Chen
2018-01-15 5:53 ` [PATCH v6 21/36] nds32: Library functions Greentime Hu
[not found] ` <6e8431d52d635f077ca49b2f1f7dd905bdf27a3c.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:31 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 22/36] nds32: Debugging support Greentime Hu
[not found] ` <65ae3b5b7eabe8680857b1821c72127f611c950b.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:37 ` Arnd Bergmann
[not found] ` <CAK8P3a2HKWHxmkcx5Lf3VFT6yErppXY+brmGr7k2KBLeXgvuFw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-23 7:28 ` Vincent Chen
2018-01-23 8:21 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 23/36] nds32: L2 cache support Greentime Hu
2018-01-18 10:37 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 24/36] nds32: Loadable modules Greentime Hu
2018-01-18 10:41 ` Arnd Bergmann
[not found] ` <CAK8P3a3pQSxM+gJ+dJsyeo5YnuOOyFYVoJdCVmnoHR0Numya5g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 14:26 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 25/36] nds32: Generic timers support Greentime Hu
[not found] ` <ff6346e073ae38aa96a031420f57aad3d1057ddf.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:41 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 26/36] nds32: Device tree support Greentime Hu
[not found] ` <623edb96d0a59433c25d71e5f6bb24a17804e960.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:43 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 27/36] nds32: Miscellaneous header files Greentime Hu
[not found] ` <38d9dce03a1421378a94d3d528bb0c4741e2bf7b.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:46 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 28/36] nds32: defconfig Greentime Hu
2018-01-18 10:44 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 29/36] nds32: Build infrastructure Greentime Hu
2018-01-18 11:00 ` Arnd Bergmann
2018-01-22 15:20 ` Greentime Hu
2018-01-22 15:38 ` Arnd Bergmann
2018-01-22 16:00 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 30/36] MAINTAINERS: Add nds32 Greentime Hu
2018-01-18 10:45 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 31/36] dt-bindings: nds32 CPU Bindings Greentime Hu
2018-01-18 11:02 ` Arnd Bergmann
2018-01-19 14:32 ` Greentime Hu
[not found] ` <CAEbi=3ef8JHf_Jpru1B2L3+Xz-Oz4p_t84Lh=5kuTFo0YEz=5A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 14:52 ` Arnd Bergmann
[not found] ` <CAK8P3a38hCHULZt=fGXJebcoiEGCwA0fre_kixA7sUpPP2xf5g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 15:18 ` Greentime Hu
[not found] ` <CAEbi=3eexCyrVhFZB8wmK1fT=QONzc63y6=dGNgj_H+Rt4zo_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 15:29 ` Geert Uytterhoeven
2018-01-19 15:35 ` Greentime Hu
[not found] ` <CAEbi=3fKp5tj32hoH=ZTo6kqpCE+Zv1LopnpVujusSfMkeaJKg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 15:37 ` Geert Uytterhoeven
2018-01-22 9:53 ` Greentime Hu
2018-01-22 11:15 ` Arnd Bergmann
2018-01-22 13:55 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 32/36] dt-bindings: nds32 L2 cache controller Bindings Greentime Hu
2018-01-18 10:45 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 33/36] dt-bindings: nds32 SoC Bindings Greentime Hu
[not found] ` <b497b9429d9bc5208334b4c1abbaeb47d3eedf95.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 11:03 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 34/36] dt-bindings: interrupt-controller: Andestech Internal Vector Interrupt Controller Greentime Hu
[not found] ` <2cd18fba6e2ab78fc0eb50dd8d1216012f90c6d8.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:46 ` Arnd Bergmann
[not found] ` <cover.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-15 5:53 ` [PATCH v6 08/36] nds32: MMU definitions Greentime Hu
2018-01-18 10:14 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 12/36] nds32: Process management Greentime Hu
2018-01-18 10:22 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 13/36] nds32: IRQ handling Greentime Hu
2018-01-18 10:22 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 18/36] nds32: System calls handling Greentime Hu
[not found] ` <933f69aa93645513e06c6e87cc2dd48bc998343d.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:27 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 35/36] irqchip: Andestech Internal Vector Interrupt Controller driver Greentime Hu
2018-01-15 5:53 ` [PATCH v6 36/36] net: faraday add nds32 support Greentime Hu
2018-01-18 11:02 ` Arnd Bergmann
2018-01-18 9:49 ` [PATCH v6 00/36] Andes(nds32) Linux Kernel Port Arnd Bergmann
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