Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759583Ab3HNJDy (ORCPT ); Wed, 14 Aug 2013 05:03:54 -0400 Received: from inca-roads.misterjones.org ([213.251.177.50]:45759 "EHLO inca-roads.misterjones.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759510Ab3HNJDv (ORCPT ); Wed, 14 Aug 2013 05:03:51 -0400 To: Daniel Lezcano Subject: Re: [PATCH v3 1/6] ARM/ARM64: =?UTF-8?Q?arch=5Ftimer=3A=20add=20m?= =?UTF-8?Q?acros=20for=20bits=20in=20control=20register?= X-PHP-Originating-Script: 0:main.inc MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Date: Wed, 14 Aug 2013 10:03:48 +0100 From: Marc Zyngier Cc: Sudeep KarkadaNagesha , Lorenzo Pieralisi , Catalin Marinas , Will Deacon , , Thomas Gleixner , Organization: ARM Ltd In-Reply-To: <520B44CF.6040403@linaro.org> References: <1374492082-13686-1-git-send-email-Sudeep.KarkadaNagesha@arm.com> <1376414984-14182-1-git-send-email-Sudeep.KarkadaNagesha@arm.com> <1376414984-14182-2-git-send-email-Sudeep.KarkadaNagesha@arm.com> <520B44CF.6040403@linaro.org> Message-ID: <6071c584a32b1a5f80923818a477a719@www.loen.fr> User-Agent: Roundcube Webmail/0.7.2 X-SA-Exim-Connect-IP: X-SA-Exim-Rcpt-To: daniel.lezcano@linaro.org, sudeep.karkadanagesha@arm.com, lorenzo.pieralisi@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org X-SA-Exim-Mail-From: marc.zyngier@arm.com X-SA-Exim-Scanned: No (on cheepnis.misterjones.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4142 Lines: 113 Hi Daniel, On 2013-08-14 09:50, Daniel Lezcano wrote: > On 08/13/2013 07:29 PM, Sudeep KarkadaNagesha wrote: >> From: Sudeep KarkadaNagesha >> >> Add macros to describe the bitfields in the ARM architected timer >> control register to make code easy to understand. >> >> Cc: Catalin Marinas >> Reviewed-by: Lorenzo Pieralisi >> Reviewed-by: Will Deacon >> Signed-off-by: Sudeep KarkadaNagesha >> --- >> arch/arm/include/asm/arch_timer.h | 9 +++++++-- >> arch/arm64/include/asm/arch_timer.h | 12 ++++++++---- >> include/clocksource/arm_arch_timer.h | 8 ++++++++ >> 3 files changed, 23 insertions(+), 6 deletions(-) >> >> diff --git a/arch/arm/include/asm/arch_timer.h >> b/arch/arm/include/asm/arch_timer.h >> index e406d57..9ef74da 100644 >> --- a/arch/arm/include/asm/arch_timer.h >> +++ b/arch/arm/include/asm/arch_timer.h >> @@ -95,8 +95,13 @@ static inline void >> arch_counter_set_user_access(void) >> >> asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl)); >> >> - /* disable user access to everything */ >> - cntkctl &= ~((3 << 8) | (7 << 0)); >> + /* Disable user access to both physical/virtual counters/timers. >> */ >> + /* Also disable virtual event stream */ >> + cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN >> + | ARCH_TIMER_USR_VT_ACCESS_EN >> + | ARCH_TIMER_VIRT_EVT_EN >> + | ARCH_TIMER_USR_VCT_ACCESS_EN >> + | ARCH_TIMER_USR_PCT_ACCESS_EN); >> >> asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl)); >> } >> diff --git a/arch/arm64/include/asm/arch_timer.h >> b/arch/arm64/include/asm/arch_timer.h >> index 98abd47..00b09d0 100644 >> --- a/arch/arm64/include/asm/arch_timer.h >> +++ b/arch/arm64/include/asm/arch_timer.h >> @@ -101,12 +101,16 @@ static inline void >> arch_counter_set_user_access(void) >> { >> u32 cntkctl; >> >> - /* Disable user access to the timers and the physical counter. */ >> asm volatile("mrs %0, cntkctl_el1" : "=r" (cntkctl)); >> - cntkctl &= ~((3 << 8) | (1 << 0)); >> >> - /* Enable user access to the virtual counter and frequency. */ >> - cntkctl |= (1 << 1); >> + /* Disable user access to the timers and the physical counter. */ >> + cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN >> + | ARCH_TIMER_USR_VT_ACCESS_EN >> + | ARCH_TIMER_USR_PCT_ACCESS_EN); >> + >> + /* Enable user access to the virtual counter. */ >> + cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN; >> + >> asm volatile("msr cntkctl_el1, %0" : : "r" (cntkctl)); >> } > > Before doing those changes, I suggest you kill > include/asm/arch_timer.h > header file and move the functions directly in the arm_arch_timer.c > as > they are only used by it. How do you suggest to proceed? Having #ifdefs in arm_arch_timer.c to cope with the inline assembly functions present in both arm and arm64 include files? Doesn't seem much of a progress to me... >> diff --git a/include/clocksource/arm_arch_timer.h >> b/include/clocksource/arm_arch_timer.h >> index c463ce9..551f7e9 100644 >> --- a/include/clocksource/arm_arch_timer.h >> +++ b/include/clocksource/arm_arch_timer.h >> @@ -29,6 +29,14 @@ >> #define ARCH_TIMER_PHYS_ACCESS 0 >> #define ARCH_TIMER_VIRT_ACCESS 1 >> >> +#define ARCH_TIMER_USR_PCT_ACCESS_EN (1 << 0) /* physical counter >> */ >> +#define ARCH_TIMER_USR_VCT_ACCESS_EN (1 << 1) /* virtual counter */ >> +#define ARCH_TIMER_VIRT_EVT_EN (1 << 2) >> +#define ARCH_TIMER_EVT_TRIGGER_SHIFT (4) >> +#define ARCH_TIMER_EVT_TRIGGER_MASK (0xF << >> ARCH_TIMER_EVT_TRIGGER_SHIFT) >> +#define ARCH_TIMER_USR_VT_ACCESS_EN (1 << 8) /* virtual timer >> registers */ >> +#define ARCH_TIMER_USR_PT_ACCESS_EN (1 << 9) /* physical timer >> registers */ >> + >> #ifdef CONFIG_ARM_ARCH_TIMER >> >> extern u32 arch_timer_get_rate(void); >> M. -- Fast, cheap, reliable. 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