From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E5FFC34022 for ; Mon, 17 Feb 2020 19:19:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3830621D7D for ; Mon, 17 Feb 2020 19:19:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729874AbgBQTTB (ORCPT ); Mon, 17 Feb 2020 14:19:01 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:34657 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729717AbgBQTSx (ORCPT ); Mon, 17 Feb 2020 14:18:53 -0500 Received: from [5.158.153.53] (helo=tip-bot2.lab.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1j3lus-0006E4-6m; Mon, 17 Feb 2020 20:18:50 +0100 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id D52D01C20B8; Mon, 17 Feb 2020 20:18:49 +0100 (CET) Date: Mon, 17 Feb 2020 19:18:49 -0000 From: "tip-bot2 for Thomas Gleixner" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: timers/core] ARM/arm64: vdso: Use common vdso clock mode storage Cc: Thomas Gleixner , Vincenzo Frascino , x86 , LKML In-Reply-To: <20200207124403.363235229@linutronix.de> References: <20200207124403.363235229@linutronix.de> MIME-Version: 1.0 Message-ID: <158196712962.13786.1978693561495394786.tip-bot2@tip-bot2> X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the timers/core branch of tip: Commit-ID: 5e3c6a312a0946d2d83e32359612cbb925a8bed0 Gitweb: https://git.kernel.org/tip/5e3c6a312a0946d2d83e32359612cbb925a8bed0 Author: Thomas Gleixner AuthorDate: Fri, 07 Feb 2020 13:38:58 +01:00 Committer: Thomas Gleixner CommitterDate: Mon, 17 Feb 2020 20:12:16 +01:00 ARM/arm64: vdso: Use common vdso clock mode storage Convert ARM/ARM64 to the generic VDSO clock mode storage. This needs to happen in one go as they share the clocksource driver. Signed-off-by: Thomas Gleixner Tested-by: Vincenzo Frascino Reviewed-by: Vincenzo Frascino Link: https://lkml.kernel.org/r/20200207124403.363235229@linutronix.de --- arch/arm/Kconfig | 1 +- arch/arm/include/asm/clocksource.h | 5 +-- arch/arm/include/asm/vdso/gettimeofday.h | 12 ++++++-- arch/arm/include/asm/vdso/vsyscall.h | 21 +-------------- arch/arm/mm/Kconfig | 1 +- arch/arm64/Kconfig | 2 +- arch/arm64/include/asm/clocksource.h | 5 +-- arch/arm64/include/asm/vdso/compat_gettimeofday.h | 11 +++---- arch/arm64/include/asm/vdso/gettimeofday.h | 11 +++---- arch/arm64/include/asm/vdso/vsyscall.h | 9 +------ drivers/clocksource/arm_arch_timer.c | 8 ++--- 11 files changed, 29 insertions(+), 57 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 97864aa..03bbfc3 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -3,7 +3,6 @@ config ARM bool default y select ARCH_32BIT_OFF_T - select ARCH_CLOCKSOURCE_DATA select ARCH_HAS_BINFMT_FLAT select ARCH_HAS_DEBUG_VIRTUAL if MMU select ARCH_HAS_DEVMEM_IS_ALLOWED diff --git a/arch/arm/include/asm/clocksource.h b/arch/arm/include/asm/clocksource.h index 0b350a7..73beb7f 100644 --- a/arch/arm/include/asm/clocksource.h +++ b/arch/arm/include/asm/clocksource.h @@ -1,8 +1,7 @@ #ifndef _ASM_CLOCKSOURCE_H #define _ASM_CLOCKSOURCE_H -struct arch_clocksource_data { - bool vdso_direct; /* Usable for direct VDSO access? */ -}; +#define VDSO_ARCH_CLOCKMODES \ + VDSO_CLOCKMODE_ARCHTIMER #endif diff --git a/arch/arm/include/asm/vdso/gettimeofday.h b/arch/arm/include/asm/vdso/gettimeofday.h index f4757d3..07d791c 100644 --- a/arch/arm/include/asm/vdso/gettimeofday.h +++ b/arch/arm/include/asm/vdso/gettimeofday.h @@ -117,15 +117,21 @@ static __always_inline u64 __arch_get_hw_counter(int clock_mode) #ifdef CONFIG_ARM_ARCH_TIMER u64 cycle_now; - if (!clock_mode) - return -EINVAL; + /* + * Core checks for mode already, so this raced against a concurrent + * update. Return something. Core will do another round and then + * see the mode change and fallback to the syscall. + */ + if (clock_mode == VDSO_CLOCKMODE_NONE) + return 0; isb(); cycle_now = read_sysreg(CNTVCT); return cycle_now; #else - return -EINVAL; /* use fallback */ + /* Make GCC happy. This is compiled out anyway */ + return 0; #endif } diff --git a/arch/arm/include/asm/vdso/vsyscall.h b/arch/arm/include/asm/vdso/vsyscall.h index 85a7e58..002f9ed 100644 --- a/arch/arm/include/asm/vdso/vsyscall.h +++ b/arch/arm/include/asm/vdso/vsyscall.h @@ -11,18 +11,6 @@ extern struct vdso_data *vdso_data; extern bool cntvct_ok; -static __always_inline -bool tk_is_cntvct(const struct timekeeper *tk) -{ - if (!IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) - return false; - - if (!tk->tkr_mono.clock->archdata.vdso_direct) - return false; - - return true; -} - /* * Update the vDSO data page to keep in sync with kernel timekeeping. */ @@ -41,15 +29,6 @@ bool __arm_update_vdso_data(void) #define __arch_update_vdso_data __arm_update_vdso_data static __always_inline -int __arm_get_clock_mode(struct timekeeper *tk) -{ - u32 __tk_is_cntvct = tk_is_cntvct(tk); - - return __tk_is_cntvct; -} -#define __arch_get_clock_mode __arm_get_clock_mode - -static __always_inline void __arm_sync_vdso_data(struct vdso_data *vdata) { flush_dcache_page(virt_to_page(vdata)); diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 65e4482..865e888 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -900,6 +900,7 @@ config VDSO select GENERIC_TIME_VSYSCALL select GENERIC_VDSO_32 select GENERIC_GETTIMEOFDAY + select GENERIC_VDSO_CLOCK_MODE help Place in the process address space an ELF shared object providing fast implementations of gettimeofday and diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 0b30e88..7809d49 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -9,7 +9,6 @@ config ARM64 select ACPI_MCFG if (ACPI && PCI) select ACPI_SPCR_TABLE if ACPI select ACPI_PPTT if ACPI - select ARCH_CLOCKSOURCE_DATA select ARCH_HAS_DEBUG_VIRTUAL select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_DMA_PREP_COHERENT @@ -111,6 +110,7 @@ config ARM64 select GENERIC_STRNLEN_USER select GENERIC_TIME_VSYSCALL select GENERIC_GETTIMEOFDAY + select GENERIC_VDSO_CLOCK_MODE select HANDLE_DOMAIN_IRQ select HARDIRQS_SW_RESEND select HAVE_PCI diff --git a/arch/arm64/include/asm/clocksource.h b/arch/arm64/include/asm/clocksource.h index 0ece64a..eb82e9d 100644 --- a/arch/arm64/include/asm/clocksource.h +++ b/arch/arm64/include/asm/clocksource.h @@ -2,8 +2,7 @@ #ifndef _ASM_CLOCKSOURCE_H #define _ASM_CLOCKSOURCE_H -struct arch_clocksource_data { - bool vdso_direct; /* Usable for direct VDSO access? */ -}; +#define VDSO_ARCH_CLOCKMODES \ + VDSO_CLOCKMODE_ARCHTIMER #endif diff --git a/arch/arm64/include/asm/vdso/compat_gettimeofday.h b/arch/arm64/include/asm/vdso/compat_gettimeofday.h index 537b1e6..81b0c39 100644 --- a/arch/arm64/include/asm/vdso/compat_gettimeofday.h +++ b/arch/arm64/include/asm/vdso/compat_gettimeofday.h @@ -12,8 +12,6 @@ #include -#define __VDSO_USE_SYSCALL ULLONG_MAX - #define VDSO_HAS_CLOCK_GETRES 1 #define BUILD_VDSO32 1 @@ -117,11 +115,12 @@ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode) u64 res; /* - * clock_mode == 0 implies that vDSO are enabled otherwise - * fallback on syscall. + * Core checks for mode already, so this raced against a concurrent + * update. Return something. Core will do another round and then + * see the mode change and fallback to the syscall. */ - if (clock_mode) - return __VDSO_USE_SYSCALL; + if (clock_mode == VDSO_CLOCKMODE_NONE) + return 0; /* * This isb() is required to prevent that the counter value diff --git a/arch/arm64/include/asm/vdso/gettimeofday.h b/arch/arm64/include/asm/vdso/gettimeofday.h index b08f476..5a53443 100644 --- a/arch/arm64/include/asm/vdso/gettimeofday.h +++ b/arch/arm64/include/asm/vdso/gettimeofday.h @@ -10,8 +10,6 @@ #include #include -#define __VDSO_USE_SYSCALL ULLONG_MAX - #define VDSO_HAS_CLOCK_GETRES 1 static __always_inline @@ -71,11 +69,12 @@ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode) u64 res; /* - * clock_mode == 0 implies that vDSO are enabled otherwise - * fallback on syscall. + * Core checks for mode already, so this raced against a concurrent + * update. Return something. Core will do another round and then + * see the mode change and fallback to the syscall. */ - if (clock_mode) - return __VDSO_USE_SYSCALL; + if (clock_mode == VDSO_CLOCKMODE_NONE) + return 0; /* * This isb() is required to prevent that the counter value diff --git a/arch/arm64/include/asm/vdso/vsyscall.h b/arch/arm64/include/asm/vdso/vsyscall.h index 0c20a7c..f94b145 100644 --- a/arch/arm64/include/asm/vdso/vsyscall.h +++ b/arch/arm64/include/asm/vdso/vsyscall.h @@ -22,15 +22,6 @@ struct vdso_data *__arm64_get_k_vdso_data(void) #define __arch_get_k_vdso_data __arm64_get_k_vdso_data static __always_inline -int __arm64_get_clock_mode(struct timekeeper *tk) -{ - u32 use_syscall = !tk->tkr_mono.clock->archdata.vdso_direct; - - return use_syscall; -} -#define __arch_get_clock_mode __arm64_get_clock_mode - -static __always_inline void __arm64_update_vsyscall(struct vdso_data *vdata, struct timekeeper *tk) { vdata[CS_HRES_COARSE].mask = VDSO_PRECISION_MASK; diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 9a5464c..ee2420d 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -69,7 +69,7 @@ static enum arch_timer_ppi_nr arch_timer_uses_ppi = ARCH_TIMER_VIRT_PPI; static bool arch_timer_c3stop; static bool arch_timer_mem_use_virtual; static bool arch_counter_suspend_stop; -static bool vdso_default = true; +static enum vdso_clock_mode vdso_default = VDSO_CLOCKMODE_ARCHTIMER; static cpumask_t evtstrm_available = CPU_MASK_NONE; static bool evtstrm_enable = IS_ENABLED(CONFIG_ARM_ARCH_TIMER_EVTSTREAM); @@ -560,8 +560,8 @@ void arch_timer_enable_workaround(const struct arch_timer_erratum_workaround *wa * change both the default value and the vdso itself. */ if (wa->read_cntvct_el0) { - clocksource_counter.archdata.vdso_direct = false; - vdso_default = false; + clocksource_counter.vdso_clock_mode = VDSO_CLOCKMODE_NONE; + vdso_default = VDSO_CLOCKMODE_NONE; } } @@ -979,7 +979,7 @@ static void __init arch_counter_register(unsigned type) } arch_timer_read_counter = rd; - clocksource_counter.archdata.vdso_direct = vdso_default; + clocksource_counter.vdso_clock_mode = vdso_default; } else { arch_timer_read_counter = arch_counter_get_cntvct_mem; }