[PATCH 27/29] csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO

From: guoren
Date: Thu Jan 21 2021 - 02:10:04 EST

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From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>

It could help to reduce the latency of the time-related functions
in user space.

We have referenced arm's and riscv's implementation for the patch.

Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
Cc: Vincent Chen <vincent.chen@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
---
arch/csky/Kconfig | 4 +
arch/csky/abiv1/inc/abi/regdef.h | 5 +
arch/csky/abiv2/inc/abi/regdef.h | 5 +
arch/csky/include/asm/clocksource.h | 8 ++
arch/csky/include/asm/vdso.h | 2 +
arch/csky/include/asm/vdso/clocksource.h | 9 ++
arch/csky/include/asm/vdso/gettimeofday.h | 114 ++++++++++++++++++++++
arch/csky/include/asm/vdso/processor.h | 12 +++
arch/csky/include/asm/vdso/vsyscall.h | 22 +++++
arch/csky/kernel/perf_event.c | 2 +-
arch/csky/kernel/vdso.c | 4 +
arch/csky/kernel/vdso/Makefile | 9 +-
arch/csky/kernel/vdso/vdso.lds.S | 4 +
arch/csky/kernel/vdso/vgettimeofday.c | 28 ++++++
14 files changed, 225 insertions(+), 3 deletions(-)
create mode 100644 arch/csky/include/asm/clocksource.h
create mode 100644 arch/csky/include/asm/vdso/clocksource.h
create mode 100644 arch/csky/include/asm/vdso/gettimeofday.h
create mode 100644 arch/csky/include/asm/vdso/processor.h
create mode 100644 arch/csky/include/asm/vdso/vsyscall.h
create mode 100644 arch/csky/kernel/vdso/vgettimeofday.c

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 7f1721101ea0..34e91224adc3 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -35,6 +35,9 @@ config CSKY
select GENERIC_IRQ_MULTI_HANDLER
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
+ select GENERIC_TIME_VSYSCALL
+ select GENERIC_VDSO_32
+ select GENERIC_GETTIMEOFDAY
select GX6605S_TIMER if CPU_CK610
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_AUDITSYSCALL
@@ -46,6 +49,7 @@ config CSKY
select HAVE_DEBUG_KMEMLEAK
select HAVE_DYNAMIC_FTRACE
select HAVE_DYNAMIC_FTRACE_WITH_REGS
+ select HAVE_GENERIC_VDSO
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_ERROR_INJECTION
diff --git a/arch/csky/abiv1/inc/abi/regdef.h b/arch/csky/abiv1/inc/abi/regdef.h
index 104707fbdcc1..d555b6c440dd 100644
--- a/arch/csky/abiv1/inc/abi/regdef.h
+++ b/arch/csky/abiv1/inc/abi/regdef.h
@@ -4,7 +4,12 @@
#ifndef __ASM_CSKY_REGDEF_H
#define __ASM_CSKY_REGDEF_H

+#ifdef __ASSEMBLY__
#define syscallid r1
+#else
+#define syscallid "r1"
+#endif
+
#define regs_syscallid(regs) regs->regs[9]
#define regs_fp(regs) regs->regs[2]

diff --git a/arch/csky/abiv2/inc/abi/regdef.h b/arch/csky/abiv2/inc/abi/regdef.h
index d7328bbc1ce7..b8441b032c54 100644
--- a/arch/csky/abiv2/inc/abi/regdef.h
+++ b/arch/csky/abiv2/inc/abi/regdef.h
@@ -4,7 +4,12 @@
#ifndef __ASM_CSKY_REGDEF_H
#define __ASM_CSKY_REGDEF_H

+#ifdef __ASSEMBLY__
#define syscallid r7
+#else
+#define syscallid "r7"
+#endif
+
#define regs_syscallid(regs) regs->regs[3]
#define regs_fp(regs) regs->regs[4]

diff --git a/arch/csky/include/asm/clocksource.h b/arch/csky/include/asm/clocksource.h
new file mode 100644
index 000000000000..54da0e49efa1
--- /dev/null
+++ b/arch/csky/include/asm/clocksource.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_VDSO_CSKY_CLOCKSOURCE_H
+#define __ASM_VDSO_CSKY_CLOCKSOURCE_H
+
+#include <asm/vdso/clocksource.h>
+
+#endif
diff --git a/arch/csky/include/asm/vdso.h b/arch/csky/include/asm/vdso.h
index 12c5d638e784..eb5142f9c564 100644
--- a/arch/csky/include/asm/vdso.h
+++ b/arch/csky/include/asm/vdso.h
@@ -5,8 +5,10 @@

#include <linux/types.h>

+#ifndef GENERIC_TIME_VSYSCALL
struct vdso_data {
};
+#endif

/*
* The VDSO symbols are mapped into Linux so we can just use regular symbol
diff --git a/arch/csky/include/asm/vdso/clocksource.h b/arch/csky/include/asm/vdso/clocksource.h
new file mode 100644
index 000000000000..dfca7b4724b7
--- /dev/null
+++ b/arch/csky/include/asm/vdso/clocksource.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_VDSO_CSKY_CLOCKSOURCE_H
+#define __ASM_VDSO_CSKY_CLOCKSOURCE_H
+
+#define VDSO_ARCH_CLOCKMODES \
+ VDSO_CLOCKMODE_ARCHTIMER
+
+#endif /* __ASM_VDSO_CSKY_CLOCKSOURCE_H */
diff --git a/arch/csky/include/asm/vdso/gettimeofday.h b/arch/csky/include/asm/vdso/gettimeofday.h
new file mode 100644
index 000000000000..6c4f1446944f
--- /dev/null
+++ b/arch/csky/include/asm/vdso/gettimeofday.h
@@ -0,0 +1,114 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_VDSO_CSKY_GETTIMEOFDAY_H
+#define __ASM_VDSO_CSKY_GETTIMEOFDAY_H
+
+#ifndef __ASSEMBLY__
+
+#include <asm/barrier.h>
+#include <asm/unistd.h>
+#include <abi/regdef.h>
+#include <uapi/linux/time.h>
+
+#define VDSO_HAS_CLOCK_GETRES 1
+
+static __always_inline
+int gettimeofday_fallback(struct __kernel_old_timeval *_tv,
+ struct timezone *_tz)
+{
+ register struct __kernel_old_timeval *tv asm("a0") = _tv;
+ register struct timezone *tz asm("a1") = _tz;
+ register long ret asm("a0");
+ register long nr asm(syscallid) = __NR_gettimeofday;
+
+ asm volatile ("trap 0\n"
+ : "=r" (ret)
+ : "r"(tv), "r"(tz), "r"(nr)
+ : "memory");
+
+ return ret;
+}
+
+static __always_inline
+long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
+{
+ register clockid_t clkid asm("a0") = _clkid;
+ register struct __kernel_timespec *ts asm("a1") = _ts;
+ register long ret asm("a0");
+ register long nr asm(syscallid) = __NR_clock_gettime64;
+
+ asm volatile ("trap 0\n"
+ : "=r" (ret)
+ : "r"(clkid), "r"(ts), "r"(nr)
+ : "memory");
+
+ return ret;
+}
+
+static __always_inline
+long clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts)
+{
+ register clockid_t clkid asm("a0") = _clkid;
+ register struct old_timespec32 *ts asm("a1") = _ts;
+ register long ret asm("a0");
+ register long nr asm(syscallid) = __NR_clock_gettime;
+
+ asm volatile ("trap 0\n"
+ : "=r" (ret)
+ : "r"(clkid), "r"(ts), "r"(nr)
+ : "memory");
+
+ return ret;
+}
+
+static __always_inline
+int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
+{
+ register clockid_t clkid asm("a0") = _clkid;
+ register struct __kernel_timespec *ts asm("a1") = _ts;
+ register long ret asm("a0");
+ register long nr asm(syscallid) = __NR_clock_getres_time64;
+
+ asm volatile ("trap 0\n"
+ : "=r" (ret)
+ : "r"(clkid), "r"(ts), "r"(nr)
+ : "memory");
+
+ return ret;
+}
+
+static __always_inline
+int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts)
+{
+ register clockid_t clkid asm("a0") = _clkid;
+ register struct old_timespec32 *ts asm("a1") = _ts;
+ register long ret asm("a0");
+ register long nr asm(syscallid) = __NR_clock_getres;
+
+ asm volatile ("trap 0\n"
+ : "=r" (ret)
+ : "r"(clkid), "r"(ts), "r"(nr)
+ : "memory");
+
+ return ret;
+}
+
+uint64_t csky_pmu_read_cc(void);
+static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
+ const struct vdso_data *vd)
+{
+#ifdef CONFIG_CSKY_PMU_V1
+ return csky_pmu_read_cc();
+#else
+ return 0;
+#endif
+}
+
+static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
+{
+ return _vdso_data;
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __ASM_VDSO_CSKY_GETTIMEOFDAY_H */
diff --git a/arch/csky/include/asm/vdso/processor.h b/arch/csky/include/asm/vdso/processor.h
new file mode 100644
index 000000000000..39a6b561d0cc
--- /dev/null
+++ b/arch/csky/include/asm/vdso/processor.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_VDSO_CSKY_PROCESSOR_H
+#define __ASM_VDSO_CSKY_PROCESSOR_H
+
+#ifndef __ASSEMBLY__
+
+#define cpu_relax() barrier()
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_VDSO_CSKY_PROCESSOR_H */
diff --git a/arch/csky/include/asm/vdso/vsyscall.h b/arch/csky/include/asm/vdso/vsyscall.h
new file mode 100644
index 000000000000..c276211a7c4d
--- /dev/null
+++ b/arch/csky/include/asm/vdso/vsyscall.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_VDSO_CSKY_VSYSCALL_H
+#define __ASM_VDSO_CSKY_VSYSCALL_H
+
+#ifndef __ASSEMBLY__
+
+#include <vdso/datapage.h>
+
+extern struct vdso_data *vdso_data;
+
+static __always_inline struct vdso_data *__csky_get_k_vdso_data(void)
+{
+ return vdso_data;
+}
+#define __arch_get_k_vdso_data __csky_get_k_vdso_data
+
+#include <asm-generic/vdso/vsyscall.h>
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __ASM_VDSO_CSKY_VSYSCALL_H */
diff --git a/arch/csky/kernel/perf_event.c b/arch/csky/kernel/perf_event.c
index 55d5a5379483..e5f18420ce64 100644
--- a/arch/csky/kernel/perf_event.c
+++ b/arch/csky/kernel/perf_event.c
@@ -87,7 +87,7 @@ static int csky_pmu_irq;
})

/* cycle counter */
-static uint64_t csky_pmu_read_cc(void)
+uint64_t csky_pmu_read_cc(void)
{
uint32_t lo, hi, tmp;
uint64_t result;
diff --git a/arch/csky/kernel/vdso.c b/arch/csky/kernel/vdso.c
index 839523920843..16c20d64d165 100644
--- a/arch/csky/kernel/vdso.c
+++ b/arch/csky/kernel/vdso.c
@@ -8,7 +8,11 @@
#include <linux/slab.h>

#include <asm/page.h>
+#ifdef GENERIC_TIME_VSYSCALL
+#include <vdso/datapage.h>
+#else
#include <asm/vdso.h>
+#endif

extern char vdso_start[], vdso_end[];

diff --git a/arch/csky/kernel/vdso/Makefile b/arch/csky/kernel/vdso/Makefile
index 13ac549c6587..0b6909f10667 100644
--- a/arch/csky/kernel/vdso/Makefile
+++ b/arch/csky/kernel/vdso/Makefile
@@ -6,12 +6,17 @@ ARCH_REL_TYPE_ABS := R_CKCORE_ADDR32|R_CKCORE_JUMP_SLOT
include $(srctree)/lib/vdso/Makefile

# Symbols present in the vdso
-vdso-syms = rt_sigreturn
+vdso-syms += rt_sigreturn
+vdso-syms += vgettimeofday

# Files to link into the vdso
obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o

-ccflags-y := -fno-stack-protector
+ifneq ($(c-gettimeofday-y),)
+ CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
+endif
+
+ccflags-y := -fno-stack-protector -DBUILD_VDSO32

# Build rules
targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o
diff --git a/arch/csky/kernel/vdso/vdso.lds.S b/arch/csky/kernel/vdso/vdso.lds.S
index 8d226252d439..590a6c79fff7 100644
--- a/arch/csky/kernel/vdso/vdso.lds.S
+++ b/arch/csky/kernel/vdso/vdso.lds.S
@@ -49,6 +49,10 @@ VERSION
LINUX_5.10 {
global:
__vdso_rt_sigreturn;
+ __vdso_clock_gettime;
+ __vdso_clock_gettime64;
+ __vdso_gettimeofday;
+ __vdso_clock_getres;
local: *;
};
}
diff --git a/arch/csky/kernel/vdso/vgettimeofday.c b/arch/csky/kernel/vdso/vgettimeofday.c
new file mode 100644
index 000000000000..da491832c098
--- /dev/null
+++ b/arch/csky/kernel/vdso/vgettimeofday.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/time.h>
+#include <linux/types.h>
+
+int __vdso_clock_gettime(clockid_t clock,
+ struct old_timespec32 *ts)
+{
+ return __cvdso_clock_gettime32(clock, ts);
+}
+
+int __vdso_clock_gettime64(clockid_t clock,
+ struct __kernel_timespec *ts)
+{
+ return __cvdso_clock_gettime(clock, ts);
+}
+
+int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
+ struct timezone *tz)
+{
+ return __cvdso_gettimeofday(tv, tz);
+}
+
+int __vdso_clock_getres(clockid_t clock_id,
+ struct old_timespec32 *res)
+{
+ return __cvdso_clock_getres_time32(clock_id, res);
+}
--
2.17.1

Next message: guoren: "[PATCH 19/29] csky: mm: abort uaccess retries upon fatal signal"
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