Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754006Ab3H1Kp6 (ORCPT ); Wed, 28 Aug 2013 06:45:58 -0400 Received: from service87.mimecast.com ([91.220.42.44]:48369 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754034Ab3H1Kol (ORCPT ); Wed, 28 Aug 2013 06:44:41 -0400 From: Sudeep KarkadaNagesha To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Sudeep.KarkadaNagesha@arm.com, Lorenzo Pieralisi , Will Deacon , Catalin Marinas , Thomas Gleixner , Daniel Lezcano , Sudeep KarkadaNagesha , Lorenzo Pieralisi , Will Deacon Subject: [PATCH v5 3/5] ARM64: arch_timer: add support to configure and enable event stream Date: Wed, 28 Aug 2013 11:44:47 +0100 Message-Id: <1377686689-30828-4-git-send-email-Sudeep.KarkadaNagesha@arm.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1377686689-30828-1-git-send-email-Sudeep.KarkadaNagesha@arm.com> References: <1377686689-30828-1-git-send-email-Sudeep.KarkadaNagesha@arm.com> X-OriginalArrivalTime: 28 Aug 2013 10:44:38.0079 (UTC) FILETIME=[97D4BCF0:01CEA3DB] X-MC-Unique: 113082811443904001 Content-Type: text/plain; charset=WINDOWS-1252 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id r7SAk7e8005395 Content-Length: 4647 Lines: 148 From: Sudeep KarkadaNagesha This patch adds support for configuring the event stream frequency and enabling it. It also adds the hwcaps as well as compat-specific definitions to the user to detect this event stream feature. Cc: Lorenzo Pieralisi Cc: Will Deacon Cc: Catalin Marinas Signed-off-by: Sudeep KarkadaNagesha --- arch/arm64/include/asm/arch_timer.h | 34 +++++++++++++++++++++++++++++++--- arch/arm64/include/asm/hwcap.h | 8 +++++++- arch/arm64/include/uapi/asm/hwcap.h | 1 + arch/arm64/kernel/setup.c | 5 +++++ 4 files changed, 44 insertions(+), 4 deletions(-) diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h index fa4af76..b27e0a5 100644 --- a/arch/arm64/include/asm/arch_timer.h +++ b/arch/arm64/include/asm/arch_timer.h @@ -97,11 +97,21 @@ static inline u32 arch_timer_get_cntfrq(void) return val; } -static inline void arch_counter_set_user_access(void) +static inline u32 arch_timer_get_cntkctl(void) { u32 cntkctl; - asm volatile("mrs %0, cntkctl_el1" : "=r" (cntkctl)); + return cntkctl; +} + +static inline void arch_timer_set_cntkctl(u32 cntkctl) +{ + asm volatile("msr cntkctl_el1, %0" : : "r" (cntkctl)); +} + +static inline void arch_counter_set_user_access(void) +{ + u32 cntkctl = arch_timer_get_cntkctl(); /* Disable user access to the timers and the physical counter */ cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN @@ -111,7 +121,25 @@ static inline void arch_counter_set_user_access(void) /* Enable user access to the virtual counter */ cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN; - asm volatile("msr cntkctl_el1, %0" : : "r" (cntkctl)); + arch_timer_set_cntkctl(cntkctl); +} + +static inline void arch_timer_evtstrm_config(bool enable, int divider) +{ + u32 cntkctl = arch_timer_get_cntkctl(); + if (enable) { + cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK; + /* Set the divider and enable virtual event stream */ + cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT) + | ARCH_TIMER_VIRT_EVT_EN; + elf_hwcap |= HWCAP_EVTSTRM; +#ifdef CONFIG_COMPAT + compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM; +#endif + } else { + cntkctl &= ~ARCH_TIMER_VIRT_EVT_EN; /* disable event stream */ + } + arch_timer_set_cntkctl(cntkctl); } static inline u64 arch_counter_get_cntvct(void) diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h index 6d4482f..530fa879 100644 --- a/arch/arm64/include/asm/hwcap.h +++ b/arch/arm64/include/asm/hwcap.h @@ -30,6 +30,7 @@ #define COMPAT_HWCAP_IDIVA (1 << 17) #define COMPAT_HWCAP_IDIVT (1 << 18) #define COMPAT_HWCAP_IDIV (COMPAT_HWCAP_IDIVA|COMPAT_HWCAP_IDIVT) +#define COMPAT_HWCAP_EVTSTRM (1 << 21) #ifndef __ASSEMBLY__ /* @@ -37,11 +38,16 @@ * instruction set this cpu supports. */ #define ELF_HWCAP (elf_hwcap) -#define COMPAT_ELF_HWCAP (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ +#ifdef CONFIG_COMPAT +#define COMPAT_ELF_HWCAP (compat_elf_hwcap) +#define COMPAT_ELF_HWCAP_DEFAULT \ + (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\ COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\ COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV) +extern unsigned int compat_elf_hwcap; +#endif extern unsigned int elf_hwcap; #endif diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h index eea4975..9b12476 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -21,6 +21,7 @@ */ #define HWCAP_FP (1 << 0) #define HWCAP_ASIMD (1 << 1) +#define HWCAP_EVTSTRM (1 << 2) #endif /* _UAPI__ASM_HWCAP_H */ diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index add6ea6..e5c1725 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -60,6 +60,10 @@ EXPORT_SYMBOL(processor_id); unsigned int elf_hwcap __read_mostly; EXPORT_SYMBOL_GPL(elf_hwcap); +#ifdef CONFIG_COMPAT +unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; +#endif + static const char *cpu_name; static const char *machine_name; phys_addr_t __fdt_pointer __initdata; @@ -309,6 +313,7 @@ subsys_initcall(topology_init); static const char *hwcap_str[] = { "fp", "asimd", + "evtstrm", NULL }; -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/