From patchwork Thu Jan 30 16:08:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 11358243 X-Patchwork-Delegate: paulburton@kernel.org Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E29A513A4 for ; Thu, 30 Jan 2020 16:08:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B7135215A4 for ; Thu, 30 Jan 2020 16:08:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="Flnvqj48" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727268AbgA3QIk (ORCPT ); Thu, 30 Jan 2020 11:08:40 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:60025 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727328AbgA3QIk (ORCPT ); Thu, 30 Jan 2020 11:08:40 -0500 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 487ldc2tlWz9v6KN; Thu, 30 Jan 2020 17:08:36 +0100 (CET) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=Flnvqj48; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id tulGZmQ36mb7; Thu, 30 Jan 2020 17:08:36 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 487ldc1nW7z9v6KL; Thu, 30 Jan 2020 17:08:36 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1580400516; bh=UmmY6RKPs52swsiEhL0YnHgxeG0I3aYWBOfOGx8ZwIo=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=Flnvqj48dfl8/yndb1mTKcf8DvCaGWKFUHsNdNN6X0s9vFR8mJHJFxRx4Bw/iqeZR WM43eamWwOAhqv82frlTiWiUBAamKwg23Lnp84EA89xdkD58T84GgLlDir5uq96mER gfHbj/fuHJ7GkkqPhWRcgg/ywtnIB9mhdgAz6mF0= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id CB2328B87B; Thu, 30 Jan 2020 17:08:37 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id rAi9O2jk2ZVc; Thu, 30 Jan 2020 17:08:37 +0100 (CET) Received: from po14934vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 7D5798B877; Thu, 30 Jan 2020 17:08:37 +0100 (CET) Received: by po14934vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 4827E65283; Thu, 30 Jan 2020 16:08:37 +0000 (UTC) Message-Id: In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v5 3/6] lib/vdso: Allow architectures to provide the vdso data pointer To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , nathanl@linux.ibm.com, arnd@arndb.de, tglx@linutronix.de, vincenzo.frascino@arm.com, luto@kernel.org Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, x86@kernel.org Date: Thu, 30 Jan 2020 16:08:37 +0000 (UTC) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org On powerpc, __arch_get_vdso_data() clobbers the link register, requiring the caller to save it. As the parent function already has to set a stack frame and saves the link register before calling the C vdso function, retriving the vdso data pointer there is lighter. Give architectures the opportunity to hand the vdso data pointer to C vdso functions. Signed-off-by: Christophe Leroy --- lib/vdso/gettimeofday.c | 83 +++++++++++++++++++++++++++++++++-------- 1 file changed, 67 insertions(+), 16 deletions(-) diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c index f8b8ec5e63ac..72d65dd50cb4 100644 --- a/lib/vdso/gettimeofday.c +++ b/lib/vdso/gettimeofday.c @@ -206,9 +206,9 @@ static __always_inline int do_coarse(const struct vdso_data *vd, clockid_t clk, } static __maybe_unused int -__cvdso_clock_gettime_common(clockid_t clock, struct __kernel_timespec *ts) +__cvdso_clock_gettime_common(const struct vdso_data *vd, clockid_t clock, + struct __kernel_timespec *ts) { - const struct vdso_data *vd = __arch_get_vdso_data(); u32 msk; /* Check for negative values or invalid clocks */ @@ -233,23 +233,33 @@ __cvdso_clock_gettime_common(clockid_t clock, struct __kernel_timespec *ts) } static __maybe_unused int -__cvdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts) +__cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock, + struct __kernel_timespec *ts) { - int ret = __cvdso_clock_gettime_common(clock, ts); + int ret = __cvdso_clock_gettime_common(vd, clock, ts); if (unlikely(ret)) return clock_gettime_fallback(clock, ts); return 0; } +static __maybe_unused int +__cvdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts) +{ + const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_clock_gettime_data(vd, clock, ts); +} + #ifdef BUILD_VDSO32 static __maybe_unused int -__cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res) +__cvdso_clock_gettime32_data(const struct vdso_data *vd, clockid_t clock, + struct old_timespec32 *res) { struct __kernel_timespec ts; int ret; - ret = __cvdso_clock_gettime_common(clock, &ts); + ret = __cvdso_clock_gettime_common(vd, clock, &ts); if (unlikely(ret)) return clock_gettime32_fallback(clock, res); @@ -260,13 +270,21 @@ __cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res) return ret; } -#endif /* BUILD_VDSO32 */ static __maybe_unused int -__cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) +__cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res) { const struct vdso_data *vd = __arch_get_vdso_data(); + return __cvdso_clock_gettime32_data(vd, clock, res); +} +#endif /* BUILD_VDSO32 */ + +static __maybe_unused int +__cvdso_gettimeofday_data(const struct vdso_data *vd, + struct __kernel_old_timeval *tv, struct timezone *tz) +{ + if (likely(tv != NULL)) { struct __kernel_timespec ts; @@ -289,10 +307,18 @@ __cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) return 0; } -#ifdef VDSO_HAS_TIME -static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time) +static __maybe_unused int +__cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) { const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_gettimeofday_data(vd, tv, tz); +} + +#ifdef VDSO_HAS_TIME +static __maybe_unused __kernel_old_time_t +__cvdso_time_data(const struct vdso_data *vd, __kernel_old_time_t *time) +{ __kernel_old_time_t t; if (IS_ENABLED(CONFIG_TIME_NS) && vd->clock_mode == VCLOCK_TIMENS) @@ -305,13 +331,20 @@ static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time return t; } + +static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time) +{ + const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_time_data(vd, time); +} #endif /* VDSO_HAS_TIME */ #ifdef VDSO_HAS_CLOCK_GETRES static __maybe_unused -int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res) +int __cvdso_clock_getres_common(const struct vdso_data *vd, clockid_t clock, + struct __kernel_timespec *res) { - const struct vdso_data *vd = __arch_get_vdso_data(); u32 msk; u64 ns; @@ -349,23 +382,33 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res) } static __maybe_unused -int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res) +int __cvdso_clock_getres_data(const struct vdso_data *vd, clockid_t clock, + struct __kernel_timespec *res) { - int ret = __cvdso_clock_getres_common(clock, res); + int ret = __cvdso_clock_getres_common(vd, clock, res); if (unlikely(ret)) return clock_getres_fallback(clock, res); return 0; } +static __maybe_unused +int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res) +{ + const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_clock_getres_data(vd, clock, res); +} + #ifdef BUILD_VDSO32 static __maybe_unused int -__cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res) +__cvdso_clock_getres_time32_data(const struct vdso_data *vd, clockid_t clock, + struct old_timespec32 *res) { struct __kernel_timespec ts; int ret; - ret = __cvdso_clock_getres_common(clock, &ts); + ret = __cvdso_clock_getres_common(vd, clock, &ts); if (unlikely(ret)) return clock_getres32_fallback(clock, res); @@ -376,5 +419,13 @@ __cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res) } return ret; } + +static __maybe_unused int +__cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res) +{ + const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_clock_getres_time32_data(vd, clock, res); +} #endif /* BUILD_VDSO32 */ #endif /* VDSO_HAS_CLOCK_GETRES */