From nobody Sun Feb 8 15:29:02 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16F13C77B7D for ; Thu, 18 May 2023 13:13:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231519AbjERNNE (ORCPT ); Thu, 18 May 2023 09:13:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231508AbjERNM4 (ORCPT ); Thu, 18 May 2023 09:12:56 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F10521BDA; Thu, 18 May 2023 06:12:25 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4438364F49; Thu, 18 May 2023 13:11:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 436E2C433EF; Thu, 18 May 2023 13:11:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1684415481; bh=MPy7nYgZxGVT5ozD/0/9eH3LbzI1BGzOCOHyLrnUh3A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MuOlaXfZwhnukyDoq8GFeTAa/Drq3uqSxKCmo+vgN7FEIdhD/9XLJW/G24yUkcpd/ cvzKGq8WgMHHnzE7/Y8348Pvjt0lPgN1OJUjeNjZRZpbERpdWTr0Ru1qK7+o2o6Ziz VWJC4noxp9Oa81Bj1I4n+gsuVBXZtOTtqy83weKpsBFAPA8bCpj3Cibl5a2vdElEQw U/PLYLPmHTXZSH/nFPhiNPhUdaJ0LUBHkYB357y5CJggKxqzQD2m9Wl8Vz46sPtJOX JpjtdOhFXSMopTAS3/vbpe0rzIb1Zu41gtDTl/hggT7rW+UC/YXh84U7M5agBYEftg tXl/hvkRSQEhQ== From: guoren@kernel.org To: arnd@arndb.de, guoren@kernel.org, palmer@rivosinc.com, tglx@linutronix.de, peterz@infradead.org, luto@kernel.org, conor.dooley@microchip.com, heiko@sntech.de, jszhang@kernel.org, chenhuacai@kernel.org, apatel@ventanamicro.com, atishp@atishpatra.org, mark.rutland@arm.com, bjorn@kernel.org, paul.walmsley@sifive.com, catalin.marinas@arm.com, will@kernel.org, rppt@kernel.org, anup@brainfault.org, shihua@iscas.ac.cn, jiawei@iscas.ac.cn, liweiwei@iscas.ac.cn, luxufan@iscas.ac.cn, chunyu@iscas.ac.cn, tsu.yubo@gmail.com, wefu@redhat.com, wangjunqiang@iscas.ac.cn, kito.cheng@sifive.com, andy.chiu@sifive.com, vincent.chen@sifive.com, greentime.hu@sifive.com, corbet@lwn.net, wuwei2016@iscas.ac.cn, jrtc27@jrtc27.com Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren Subject: [RFC PATCH 03/22] riscv: vdso: Add time-related vDSO common flow for vdso32 Date: Thu, 18 May 2023 09:09:54 -0400 Message-Id: <20230518131013.3366406-4-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20230518131013.3366406-1-guoren@kernel.org> References: <20230518131013.3366406-1-guoren@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Guo Ren This patch adds time-related vDSO common flow for vdso32, and it's an addition to commit: ad5d1122b82f ("riscv: use vDSO common flow to reduce the latency of the time-related functions"). Then we could reduce the latency of collecting clock information for u32ilp32 (native 32-bit userspace ecosystem), just like what we've done for u64lp64. Signed-off-by: Guo Ren Signed-off-by: Guo Ren --- arch/riscv/Kconfig | 4 +- arch/riscv/include/asm/vdso/gettimeofday.h | 79 ++++++++++++++++++++++ arch/riscv/include/uapi/asm/unistd.h | 1 + arch/riscv/kernel/vdso/Makefile | 39 +++++------ arch/riscv/kernel/vdso/vgettimeofday.c | 39 +++++++++-- 5 files changed, 134 insertions(+), 28 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 643884620cd6..4d4fac81390f 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -75,7 +75,7 @@ config RISCV select GENERIC_PTDUMP if MMU select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD - select GENERIC_TIME_VSYSCALL if MMU && 64BIT + select GENERIC_TIME_VSYSCALL if MMU select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO select HARDIRQS_SW_RESEND select HAVE_ARCH_AUDITSYSCALL @@ -103,7 +103,7 @@ config RISCV select HAVE_FUNCTION_ARG_ACCESS_API select HAVE_FUNCTION_ERROR_INJECTION select HAVE_GCC_PLUGINS - select HAVE_GENERIC_VDSO if MMU && 64BIT + select HAVE_GENERIC_VDSO if MMU select HAVE_IRQ_TIME_ACCOUNTING select HAVE_KPROBES if !XIP_KERNEL select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL diff --git a/arch/riscv/include/asm/vdso/gettimeofday.h b/arch/riscv/includ= e/asm/vdso/gettimeofday.h index a7ae8576797b..0dcb6c5c4111 100644 --- a/arch/riscv/include/asm/vdso/gettimeofday.h +++ b/arch/riscv/include/asm/vdso/gettimeofday.h @@ -36,6 +36,7 @@ int gettimeofday_fallback(struct __kernel_old_timeval *_t= v, } #endif =20 +#if __SIZEOF_POINTER__ =3D=3D 8 #ifdef __NR_clock_gettime static __always_inline long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_t= s) @@ -71,6 +72,84 @@ int clock_getres_fallback(clockid_t _clkid, struct __ker= nel_timespec *_ts) return ret; } #endif + +#elif __SIZEOF_POINTER__ =3D=3D 4 + +#define BUILD_VDSO32 1 + +#ifdef __NR_clock_gettime64 +static __always_inline +long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_t= s) +{ + register clockid_t clkid asm("a0") =3D _clkid; + register struct __kernel_timespec *ts asm("a1") =3D _ts; + register long ret asm("a0"); + register long nr asm("a7") =3D __NR_clock_gettime64; + + asm volatile ("ecall\n" + : "=3Dr" (ret) + : "r"(clkid), "r"(ts), "r"(nr) + : "memory"); + + return ret; +} +#endif + +#ifdef __NR_clock_getres_time64 +static __always_inline +int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) +{ + register clockid_t clkid asm("a0") =3D _clkid; + register struct __kernel_timespec *ts asm("a1") =3D _ts; + register long ret asm("a0"); + register long nr asm("a7") =3D __NR_clock_getres_time64; + + asm volatile ("ecall\n" + : "=3Dr" (ret) + : "r"(clkid), "r"(ts), "r"(nr) + : "memory"); + + return ret; +} +#endif + +#ifdef __NR_clock_gettime +static __always_inline +int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) +{ + register clockid_t clkid asm("a0") =3D _clkid; + register struct old_timespec32 *ts asm("a1") =3D _ts; + register long ret asm("a0"); + register long nr asm("a7") =3D __NR_clock_gettime; + + asm volatile ("ecall\n" + : "=3Dr" (ret) + : "r"(clkid), "r"(ts), "r"(nr) + : "memory"); + + return ret; +} +#endif + +#ifdef __NR_clock_getres +static __always_inline +int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) +{ + register clockid_t clkid asm("a0") =3D _clkid; + register struct old_timespec32 *ts asm("a1") =3D _ts; + register long ret asm("a0"); + register long nr asm("a7") =3D __NR_clock_getres; + + asm volatile ("ecall\n" + : "=3Dr" (ret) + : "r"(clkid), "r"(ts), "r"(nr) + : "memory"); + + return ret; +} +#endif + +#endif /* __SIZEOF_POINTER__ */ #endif /* CONFIG_GENERIC_TIME_VSYSCALL */ =20 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, diff --git a/arch/riscv/include/uapi/asm/unistd.h b/arch/riscv/include/uapi= /asm/unistd.h index 950ab3fd4409..0ee86ef907e4 100644 --- a/arch/riscv/include/uapi/asm/unistd.h +++ b/arch/riscv/include/uapi/asm/unistd.h @@ -22,6 +22,7 @@ =20 #define __ARCH_WANT_SYS_CLONE3 #define __ARCH_WANT_MEMFD_SECRET +#define __ARCH_WANT_TIME32_SYSCALLS =20 #include =20 diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makef= ile index e3c3bf669c7b..42338a2c26a7 100644 --- a/arch/riscv/kernel/vdso/Makefile +++ b/arch/riscv/kernel/vdso/Makefile @@ -31,20 +31,20 @@ $(obj)/%.so: $(obj)/%.so.dbg FORCE quiet_cmd_vdso_install =3D INSTALL $@ cmd_vdso_install =3D cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ =20 -# Symbols present in the vdso -ifdef CONFIG_VDSO64 -vdso64-as-syms =3D rt_sigreturn -vdso64-as-syms +=3D getcpu -vdso64-as-syms +=3D flush_icache -vdso64-as-syms +=3D sys_hwprobe +vdso-as-syms =3D rt_sigreturn +vdso-as-syms +=3D getcpu +vdso-as-syms +=3D flush_icache +vdso-as-syms +=3D sys_hwprobe =20 -vdso64-cc-syms =3D vgettimeofday -vdso64-cc-syms +=3D hwprobe +vdso-cc-syms =3D vgettimeofday +vdso-cc-syms +=3D hwprobe =20 -obj-as-vdso64 =3D $(patsubst %, %-64.o, $(vdso64-as-syms)) note-64.o +# Symbols present in the vdso +ifdef CONFIG_VDSO64 +obj-as-vdso64 =3D $(patsubst %, %-64.o, $(vdso-as-syms)) note-64.o obj-as-vdso64 :=3D $(addprefix $(obj)/, $(obj-as-vdso64)) =20 -obj-cc-vdso64 =3D $(patsubst %, %-64.o, $(vdso64-cc-syms)) +obj-cc-vdso64 =3D $(patsubst %, %-64.o, $(vdso-cc-syms)) obj-cc-vdso64 :=3D $(addprefix $(obj)/, $(obj-cc-vdso64)) =20 targets +=3D $(obj-as-vdso64) $(obj-cc-vdso64) vdso64.so vdso64.so.dbg vds= o64.lds @@ -57,7 +57,7 @@ LDFLAGS_vdso64.so.dbg =3D -shared -S -soname=3Dlinux-vdso= 64.so.1 \ # Make sure only to export the intended __vdso_xxx symbol offsets. quiet_cmd_vdso64ld =3D VDSO64LD $@ cmd_vdso64ld =3D $(VDSO_LD) $(ld_flags) $(VDSO64_LD_FLAGS) -T $(filt= er-out FORCE,$^) -o $@.tmp && \ - $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso64-as-syms)= $(vdso64-cc-syms)) $@.tmp $@ && \ + $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-as-syms) $= (vdso-cc-syms)) $@.tmp $@ && \ rm $@.tmp =20 # actual build commands @@ -96,20 +96,13 @@ vdso64_install: vdso64.so endif =20 ifdef CONFIG_VDSO32 -vdso32-as-syms =3D rt_sigreturn -vdso32-as-syms +=3D getcpu -vdso32-as-syms +=3D flush_icache -vdso32-as-syms +=3D sys_hwprobe - -vdso32-cc-syms +=3D hwprobe - VDSO32_CC_FLAGS :=3D -march=3Drv32g -mabi=3Dilp32 VDSO32_LD_FLAGS :=3D -melf32lriscv =20 -obj-as-vdso32 =3D $(patsubst %, %-32.o, $(vdso32-as-syms)) note-32.o +obj-as-vdso32 =3D $(patsubst %, %-32.o, $(vdso-as-syms)) note-32.o obj-as-vdso32 :=3D $(addprefix $(obj)/, $(obj-as-vdso32)) =20 -obj-cc-vdso32 =3D $(patsubst %, %-32.o, $(vdso32-cc-syms)) +obj-cc-vdso32 =3D $(patsubst %, %-32.o, $(vdso-cc-syms)) obj-cc-vdso32 :=3D $(addprefix $(obj)/, $(obj-cc-vdso32)) =20 targets +=3D $(obj-as-vdso32) $(obj-cc-vdso32) vdso32.so vdso32.so.dbg vds= o32.lds @@ -123,7 +116,7 @@ LDFLAGS_vdso32.so.dbg =3D -shared -S -soname=3Dlinux-vd= so32.so.1 \ # Make sure only to export the intended __vdso_xxx symbol offsets. quiet_cmd_vdso32ld =3D VDSO32LD $@ cmd_vdso32ld =3D $(VDSO_LD) $(ld_flags) $(VDSO32_LD_FLAGS) -T $(filt= er-out FORCE,$^) -o $@.tmp && \ - $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso32-as-syms)= $(vdso32-cc-syms)) $@.tmp $@ && \ + $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-as-syms) $= (vdso-cc-syms)) $@.tmp $@ && \ rm $@.tmp =20 # actual build commands @@ -142,6 +135,10 @@ $(obj-cc-vdso32): %-32.o: %.c FORCE =20 CFLAGS_hwprobe-32.o +=3D -fPIC =20 +CFLAGS_vgettimeofday-32.o +=3D -fPIC -include $(c-gettimeofday-y) +# Disable -pg to prevent insert call site +CFLAGS_REMOVE_vgettimeofday-32.o =3D $(CC_FLAGS_FTRACE) + # Generate VDSO offsets using helper script gen-vdso32sym :=3D $(srctree)/$(src)/gen_vdso32_offsets.sh quiet_cmd_vdso32sym =3D VDSO32SYM $@ diff --git a/arch/riscv/kernel/vdso/vgettimeofday.c b/arch/riscv/kernel/vds= o/vgettimeofday.c index cc0d80699c31..056b465eb161 100644 --- a/arch/riscv/kernel/vdso/vgettimeofday.c +++ b/arch/riscv/kernel/vdso/vgettimeofday.c @@ -9,6 +9,14 @@ #include #include =20 +extern +int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *= tz); +int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *= tz) +{ + return __cvdso_gettimeofday(tv, tz); +} + +#if __SIZEOF_POINTER__ =3D=3D 8 extern int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts); int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts) @@ -17,15 +25,36 @@ int __vdso_clock_gettime(clockid_t clock, struct __kern= el_timespec *ts) } =20 extern -int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *= tz); -int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *= tz) +int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res); +int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res) { - return __cvdso_gettimeofday(tv, tz); + return __cvdso_clock_getres(clock_id, res); +} +#elif __SIZEOF_POINTER__ =3D=3D 4 +extern +int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts); +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); +int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts) +{ + return __cvdso_clock_gettime(clock, ts); } =20 extern -int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res); -int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res) +int __vdso_clock_getres(clockid_t clock_id, struct old_timespec32 *res); +int __vdso_clock_getres(clockid_t clock_id, struct old_timespec32 *res) +{ + return __cvdso_clock_getres_time32(clock_id, res); +} + +extern +int __vdso_clock_getres64(clockid_t clock_id, struct __kernel_timespec *re= s); +int __vdso_clock_getres64(clockid_t clock_id, struct __kernel_timespec *re= s) { return __cvdso_clock_getres(clock_id, res); } +#endif --=20 2.36.1