From patchwork Mon May 13 10:38:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663293 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8F2E9148FE5; Mon, 13 May 2024 10:38:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715596711; cv=none; b=LjDfJ9XnW1KRXkyLrSGHLi0xMDRlDaJ+Kce7kt6kX7sR/y79oF/q7H9fLbkHpKkuJk+3lapbFJR2vYlDq+GFp5t5tSE59yYAOWbPYs3KsMYw0CwYa5Bg8AonRebk68JzDoNXz+sFlbDOpljk72J3LIHZvR1XvKLq/LxfcZNrQas= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715596711; c=relaxed/simple; bh=7G4eSCDfpVxftfhKiGN17VIsixny1njY40VIbJ98TVA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=fLeZni6erPjTU1kfwJvNXc2ay8H21Mcio2tA3BJv/DGYUgQkOo6Q2bcVfIwY1Bfmdk/zRpUCCl+GNPfeHrTQFw2KvtrmXJi1dr0U30HUv2Y9qjXec3o+MJOdmsvBL7DY1KGqf2ND6ve700nS9Jxt+ywUl4x6RXFZCMGkR/QQEb8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=fc1YiLWW; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="fc1YiLWW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1715596709; x=1747132709; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7G4eSCDfpVxftfhKiGN17VIsixny1njY40VIbJ98TVA=; b=fc1YiLWWyExVdn0mtxVgbifntNsLB88tPuNXm5Lw/IxXRZLPdE2hky9s 0O0SfoSYfvX9bxJN0QJ2DFxfwJpCvm/Zf8wb5/K4AZykStJbld4VlqnpC 9UwLMPq31hmsAlDxovHBIN6tr0IXq7AvXj0cNVQ9E+80PbwkR1VVmJJGF AYCWvD8ZNpAoDcwOQSUkfLjJ4SdcDuTaFtx0LV/oW96YyCVQ2bIXs1C31 aX6Ovb4aNbic3LsT/qN/tlz7pVAJcTMHjMo2zXC0wi0SuJDAu+NOLYbzx /iSkFLZPvD3ZQCbonHF8SdWf0eAnnxK5/BsP1Xgh7bY2jAVj2gG2e7/rk g==; X-CSE-ConnectionGUID: UhgtvWuUQEOhhwfEfOeu9w== X-CSE-MsgGUID: 7330siw8Rcy/B+AFkqB/bw== X-IronPort-AV: E=McAfee;i="6600,9927,11071"; a="29038867" X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="29038867" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 May 2024 03:38:27 -0700 X-CSE-ConnectionGUID: 5SXcqXPNRZOJJ/yAAKqLpA== X-CSE-MsgGUID: v0sYACCoRqKLe2eBPIE8iw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="61481699" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:38:20 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 01/12] timekeeping: Add base clock properties in clocksource structure Date: Mon, 13 May 2024 16:08:02 +0530 Message-Id: <20240513103813.5666-2-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lakshmi Sowjanya D Add base clock hardware abstraction in clocksource structure. Provide generic functionality in convert_base_to_cs() to convert base clock timestamps to system clocksource without requiring architecture specific parameters. This is intended to replace convert_art_to_tsc() and convert_art_ns_to_tsc() functions which are specific to convert ART (Always Running Timer) time to the corresponding TSC value. Add the infrastructure in get_device_system_crosststamp(). Co-developed-by: Thomas Gleixner Signed-off-by: Thomas Gleixner Co-developed-by: Christopher S. Hall Signed-off-by: Christopher S. Hall Signed-off-by: Lakshmi Sowjanya D --- include/linux/clocksource.h | 27 ++++++++++++++++++++++++++ include/linux/timekeeping.h | 2 ++ kernel/time/timekeeping.c | 38 ++++++++++++++++++++++++++++++++++++- 3 files changed, 66 insertions(+), 1 deletion(-) diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index 0ad8b550bb4b..d35b677b08fe 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -21,6 +21,7 @@ #include #include +struct clocksource_base; struct clocksource; struct module; @@ -50,6 +51,7 @@ struct module; * multiplication * @name: Pointer to clocksource name * @list: List head for registration (internal) + * @freq_khz: Clocksource frequency in khz. * @rating: Rating value for selection (higher is better) * To avoid rating inflation the following * list should give you a guide as to how @@ -70,6 +72,8 @@ struct module; * validate the clocksource from which the snapshot was * taken. * @flags: Flags describing special properties + * @base: Hardware abstraction for clock on which a clocksource + * is based * @enable: Optional function to enable the clocksource * @disable: Optional function to disable the clocksource * @suspend: Optional suspend function for the clocksource @@ -107,10 +111,12 @@ struct clocksource { u64 max_cycles; const char *name; struct list_head list; + u32 freq_khz; int rating; enum clocksource_ids id; enum vdso_clock_mode vdso_clock_mode; unsigned long flags; + struct clocksource_base *base; int (*enable)(struct clocksource *cs); void (*disable)(struct clocksource *cs); @@ -306,4 +312,25 @@ static inline unsigned int clocksource_get_max_watchdog_retry(void) void clocksource_verify_percpu(struct clocksource *cs); +/** + * struct clocksource_base - hardware abstraction for clock on which a clocksource + * is based + * @id: Defaults to CSID_GENERIC. The id value is used for conversion + * functions which require that the current clocksource is based + * on a clocksource_base with a particular ID in certain snapshot + * functions to allow callers to validate the clocksource from + * which the snapshot was taken. + * @freq_khz: Nominal frequency of the base clock in kHz + * @offset: Offset between the base clock and the clocksource + * @numerator: Numerator of the clock ratio between base clock and the clocksource + * @denominator: Denominator of the clock ratio between base clock and the clocksource + */ +struct clocksource_base { + enum clocksource_ids id; + u32 freq_khz; + u64 offset; + u32 numerator; + u32 denominator; +}; + #endif /* _LINUX_CLOCKSOURCE_H */ diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index 0ea7823b7f31..b2ee182d891e 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -310,10 +310,12 @@ struct system_device_crosststamp { * timekeeping code to verify comparability of two cycle values. * The default ID, CSID_GENERIC, does not identify a specific * clocksource. + * @use_nsecs: @cycles is in nanoseconds. */ struct system_counterval_t { u64 cycles; enum clocksource_ids cs_id; + bool use_nsecs; }; /* diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index b58dffc58a8f..92994450f268 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -1193,6 +1193,42 @@ static bool timestamp_in_interval(u64 start, u64 end, u64 ts) return false; } +static bool convert_clock(u64 *val, u32 numerator, u32 denominator) +{ + u64 rem, res; + + if (!numerator || !denominator) + return false; + + res = div64_u64_rem(*val, denominator, &rem) * numerator; + *val = res + div_u64(rem * numerator, denominator); + return true; +} + +static bool convert_base_to_cs(struct system_counterval_t *scv) +{ + struct clocksource *cs = tk_core.timekeeper.tkr_mono.clock; + struct clocksource_base *base = cs->base; + u32 num, den; + + /* The timestamp was taken from the time keeper clock source */ + if (cs->id == scv->cs_id) + return true; + + /* Check whether cs_id matches the base clock */ + if (!base || base->id != scv->cs_id) + return false; + + num = scv->use_nsecs ? cs->freq_khz : base->numerator; + den = scv->use_nsecs ? USEC_PER_SEC : base->denominator; + + if (!convert_clock(&scv->cycles, num, den)) + return false; + + scv->cycles += base->offset; + return true; +} + /** * get_device_system_crosststamp - Synchronously capture system/device timestamp * @get_time_fn: Callback to get simultaneous device time and @@ -1239,7 +1275,7 @@ int get_device_system_crosststamp(int (*get_time_fn) * installed timekeeper clocksource */ if (system_counterval.cs_id == CSID_GENERIC || - tk->tkr_mono.clock->id != system_counterval.cs_id) + !convert_base_to_cs(&system_counterval)) return -ENODEV; cycles = system_counterval.cycles; From patchwork Mon May 13 10:38:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663294 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A88421465AC; Mon, 13 May 2024 10:38:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715596717; cv=none; b=L7sUGmLPep5IH8KuZIOYHmCSEsLuDoqlUDUG9pKK8HsDo1iDxxa+dReTYv46Kr3Ne4FIhIOBN1usTXL1hh9xdkrn6CbpeVad9F3ksfmLjh0ZGlj07Bjq1xPuoN1kDwoyvMRKK94rG+yZYE5CP8H+L4KV9HbT3jwqsEMbCctX4nU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715596717; c=relaxed/simple; bh=y5adxHXLHL8NZQh0tAHT3KFv1sn+kvC5uRh0rbKSfoQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=G0tKUNeLdz/os6VCYLbak7QwmovEna+HIqRcKjS+lU0YAwvLaDI2L6x+aMMI9zgx/KyG8WPyGc60za1ys1QLA1z/F4CxlLUcR4wduAMCA1Oj5WgO4X6x3yJiBDYeFrpp3GXTw/sYLHOr1rXVeWaGFcHxBxBO6KlUFCBU9IUlx/s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=EpLAJD2u; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="EpLAJD2u" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1715596716; x=1747132716; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=y5adxHXLHL8NZQh0tAHT3KFv1sn+kvC5uRh0rbKSfoQ=; b=EpLAJD2uI5b6i43gRbC3KOu7jWvVcEOCkR+Of190ZkLqwC2v7r4N6bZF 8mv8OUaHbIJ3XqWx/Ezbc4DQOpX/23NtX/YxN7bpEB77TdUcgcD0qrcpM fd8Q6NOqNpoZYXo9Cn5tkemTP6Ss8R+Q9AO2e3pDUHSSxMqEEWZObfAUn cfrnmJPSnBC3e35sXmGVoKMK7CcQJoV74hma0KTJPQZ55VdqhpdqDk7zR 4cZynOiU0BAfB9ltIBQzlxc2NtNmFBdAiCMWPBEERaJKlNjtT5EKbrFo+ jOLLRQha7TX8FyKmHr+9ibeddiqIxKocb5OiRUqrvKkv2oOcILXc4kw/V Q==; X-CSE-ConnectionGUID: MqjVmZXPScSg6XpYM1MGdA== X-CSE-MsgGUID: iMwK1tzSTz2637jx+KZi1g== X-IronPort-AV: E=McAfee;i="6600,9927,11071"; a="29038917" X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="29038917" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 May 2024 03:38:33 -0700 X-CSE-ConnectionGUID: S0EKDxP7Tjm3v9vAPSI90A== X-CSE-MsgGUID: H59GIhOWQLO7T9GEWfPavQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="61481717" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:38:27 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 02/12] x86/tsc: Update tsc/art values in the base clock structure Date: Mon, 13 May 2024 16:08:03 +0530 Message-Id: <20240513103813.5666-3-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lakshmi Sowjanya D Add clocksource ID for x86 ART (Always Running Timer). The newly added clocksource ID and conversion parameters are used to convert time in a clocksource domain to base clock and vice versa. Earlier code used architecture specific macros for the conversion, now core code added hardware agnostic functions to convert the timestamp using base clocksource structure. Update the base clock structure (ART) for system clock based on TSC. Co-developed-by: Thomas Gleixner Signed-off-by: Thomas Gleixner Co-developed-by: Christopher S. Hall Signed-off-by: Christopher S. Hall Signed-off-by: Lakshmi Sowjanya D --- arch/x86/kernel/tsc.c | 42 +++++++++++++++++++-------------- include/linux/clocksource_ids.h | 1 + 2 files changed, 25 insertions(+), 18 deletions(-) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 5a69a49acc96..45bf2f6d0ffa 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -50,9 +50,9 @@ int tsc_clocksource_reliable; static int __read_mostly tsc_force_recalibrate; -static u32 art_to_tsc_numerator; -static u32 art_to_tsc_denominator; -static u64 art_to_tsc_offset; +static struct clocksource_base art_base_clk = { + .id = CSID_X86_ART, +}; static bool have_art; struct cyc2ns { @@ -1074,7 +1074,7 @@ core_initcall(cpufreq_register_tsc_scaling); */ static void __init detect_art(void) { - unsigned int unused[2]; + unsigned int unused; if (boot_cpu_data.cpuid_level < ART_CPUID_LEAF) return; @@ -1089,13 +1089,14 @@ static void __init detect_art(void) tsc_async_resets) return; - cpuid(ART_CPUID_LEAF, &art_to_tsc_denominator, - &art_to_tsc_numerator, unused, unused+1); + cpuid(ART_CPUID_LEAF, &art_base_clk.denominator, + &art_base_clk.numerator, &art_base_clk.freq_khz, &unused); - if (art_to_tsc_denominator < ART_MIN_DENOMINATOR) + art_base_clk.freq_khz /= KHZ; + if (art_base_clk.denominator < ART_MIN_DENOMINATOR) return; - rdmsrl(MSR_IA32_TSC_ADJUST, art_to_tsc_offset); + rdmsrl(MSR_IA32_TSC_ADJUST, art_base_clk.offset); /* Make this sticky over multiple CPU init calls */ setup_force_cpu_cap(X86_FEATURE_ART); @@ -1303,13 +1304,13 @@ struct system_counterval_t convert_art_to_tsc(u64 art) { u64 tmp, res, rem; - rem = do_div(art, art_to_tsc_denominator); + rem = do_div(art, art_base_clk.denominator); - res = art * art_to_tsc_numerator; - tmp = rem * art_to_tsc_numerator; + res = art * art_base_clk.numerator; + tmp = rem * art_base_clk.numerator; - do_div(tmp, art_to_tsc_denominator); - res += tmp + art_to_tsc_offset; + do_div(tmp, art_base_clk.denominator); + res += tmp + art_base_clk.offset; return (struct system_counterval_t) { .cs_id = have_art ? CSID_X86_TSC : CSID_GENERIC, @@ -1356,7 +1357,6 @@ struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns) } EXPORT_SYMBOL(convert_art_ns_to_tsc); - static void tsc_refine_calibration_work(struct work_struct *work); static DECLARE_DELAYED_WORK(tsc_irqwork, tsc_refine_calibration_work); /** @@ -1458,8 +1458,10 @@ static void tsc_refine_calibration_work(struct work_struct *work) if (tsc_unstable) goto unreg; - if (boot_cpu_has(X86_FEATURE_ART)) + if (boot_cpu_has(X86_FEATURE_ART)) { have_art = true; + clocksource_tsc.base = &art_base_clk; + } clocksource_register_khz(&clocksource_tsc, tsc_khz); unreg: clocksource_unregister(&clocksource_tsc_early); @@ -1484,8 +1486,10 @@ static int __init init_tsc_clocksource(void) * the refined calibration and directly register it as a clocksource. */ if (boot_cpu_has(X86_FEATURE_TSC_KNOWN_FREQ)) { - if (boot_cpu_has(X86_FEATURE_ART)) + if (boot_cpu_has(X86_FEATURE_ART)) { have_art = true; + clocksource_tsc.base = &art_base_clk; + } clocksource_register_khz(&clocksource_tsc, tsc_khz); clocksource_unregister(&clocksource_tsc_early); @@ -1509,10 +1513,12 @@ static bool __init determine_cpu_tsc_frequencies(bool early) if (early) { cpu_khz = x86_platform.calibrate_cpu(); - if (tsc_early_khz) + if (tsc_early_khz) { tsc_khz = tsc_early_khz; - else + } else { tsc_khz = x86_platform.calibrate_tsc(); + clocksource_tsc.freq_khz = tsc_khz; + } } else { /* We should not be here with non-native cpu calibration */ WARN_ON(x86_platform.calibrate_cpu != native_calibrate_cpu); diff --git a/include/linux/clocksource_ids.h b/include/linux/clocksource_ids.h index a4fa3436940c..2bb4d8c2f1b0 100644 --- a/include/linux/clocksource_ids.h +++ b/include/linux/clocksource_ids.h @@ -9,6 +9,7 @@ enum clocksource_ids { CSID_X86_TSC_EARLY, CSID_X86_TSC, CSID_X86_KVM_CLK, + CSID_X86_ART, CSID_MAX, }; From patchwork Mon May 13 10:38:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663295 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7811F14AD20; 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a="29038953" X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="29038953" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 May 2024 03:38:40 -0700 X-CSE-ConnectionGUID: TKDRBQSYQt+KkyGmmH7qiA== X-CSE-MsgGUID: 6I/FiArkTq2mDDY4WToxBw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="61481723" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:38:34 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 03/12] e1000e: remove convert_art_to_tsc() Date: Mon, 13 May 2024 16:08:04 +0530 Message-Id: <20240513103813.5666-4-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Thomas Gleixner The core code provides a mechanism to convert the ART base clock to the corresponding TSC value without requiring an architecture specific function. Store the ART clocksoure ID and the cycles value in the provided system_counterval structure. Replace the direct conversion via convert_art_to_tsc() by filling in the required data. No functional change intended. Signed-off-by: Thomas Gleixner Signed-off-by: Lakshmi Sowjanya D --- drivers/net/ethernet/intel/e1000e/ptp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/e1000e/ptp.c b/drivers/net/ethernet/intel/e1000e/ptp.c index bbcfd529399b..89d57dd911dc 100644 --- a/drivers/net/ethernet/intel/e1000e/ptp.c +++ b/drivers/net/ethernet/intel/e1000e/ptp.c @@ -124,7 +124,8 @@ static int e1000e_phc_get_syncdevicetime(ktime_t *device, sys_cycles = er32(PLTSTMPH); sys_cycles <<= 32; sys_cycles |= er32(PLTSTMPL); - *system = convert_art_to_tsc(sys_cycles); + system->cycles = sys_cycles; + system->cs_id = CSID_X86_ART; return 0; } From patchwork Mon May 13 10:38:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663296 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AA193149DEE; 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All what is required is to store the ART clocksoure ID and the cycles value in the provided system_counterval structure. Replace the direct conversion via convert_art_ns_to_tsc() by filling in the required data. No functional change intended. Signed-off-by: Thomas Gleixner Signed-off-by: Lakshmi Sowjanya D --- drivers/net/ethernet/intel/igc/igc_ptp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c index 885faaa7b9de..39656489d73e 100644 --- a/drivers/net/ethernet/intel/igc/igc_ptp.c +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c @@ -901,7 +901,11 @@ static bool igc_is_crosststamp_supported(struct igc_adapter *adapter) static struct system_counterval_t igc_device_tstamp_to_system(u64 tstamp) { #if IS_ENABLED(CONFIG_X86_TSC) && !defined(CONFIG_UML) - return convert_art_ns_to_tsc(tstamp); + return (struct system_counterval_t) { + .cs_id = CSID_X86_ART, + .cycles = tstamp, + .use_nsecs = true, + }; #else return (struct system_counterval_t) { }; #endif From patchwork Mon May 13 10:38:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663297 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3FF25149DEE; 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a="29039002" X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="29039002" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 May 2024 03:38:53 -0700 X-CSE-ConnectionGUID: IrimfoOMS8Sxdz/oMmatpQ== X-CSE-MsgGUID: DXXVjDffRS+WuYEAdRtTJw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="61481734" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:38:46 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 05/12] stmmac: intel: remove convert_art_to_tsc() Date: Mon, 13 May 2024 16:08:06 +0530 Message-Id: <20240513103813.5666-6-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Thomas Gleixner The core code provides a mechanism to convert the ART base clock to the corresponding TSC value without requiring an architecture specific function. All what is required is to store the ART clocksoure ID and the cycles value in the provided system_counterval structure. Replace the direct conversion via convert_art_to_tsc() by filling in the required data. No functional change intended. Signed-off-by: Thomas Gleixner Signed-off-by: Lakshmi Sowjanya D --- drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c index 60283543ffc8..e73fa34237d3 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c @@ -390,10 +390,11 @@ static int intel_crosststamp(ktime_t *device, *device = ns_to_ktime(ptp_time); read_unlock_irqrestore(&priv->ptp_lock, flags); get_arttime(priv->mii, intel_priv->mdio_adhoc_addr, &art_time); - *system = convert_art_to_tsc(art_time); + system->cycles = art_time; } system->cycles *= intel_priv->crossts_adj; + system->cs_id = CSID_X86_ART; priv->plat->flags &= ~STMMAC_FLAG_INT_SNAPSHOT_EN; return 0; From patchwork Mon May 13 10:38:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663298 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B37F214C58A; 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a="29039050" X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="29039050" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 May 2024 03:38:59 -0700 X-CSE-ConnectionGUID: ope2bwsRT4iZirmy/ZYHcA== X-CSE-MsgGUID: KgRrq/WQTWSQrAxXBtqbWg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="61481740" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:38:53 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 06/12] ALSA: hda: remove convert_art_to_tsc() Date: Mon, 13 May 2024 16:08:07 +0530 Message-Id: <20240513103813.5666-7-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Thomas Gleixner The core code provides a mechanism to convert the ART base clock to the corresponding TSC value without requiring an architecture specific function. All what is required is to store the ART clocksoure ID and the cycles value in the provided system_counterval structure. Replace the direct conversion via convert_art_to_tsc() by filling in the required data. No functional change intended. Signed-off-by: Thomas Gleixner Signed-off-by: Lakshmi Sowjanya D --- sound/pci/hda/hda_controller.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c index 206306a0eb82..6f648fae7a7b 100644 --- a/sound/pci/hda/hda_controller.c +++ b/sound/pci/hda/hda_controller.c @@ -463,7 +463,8 @@ static int azx_get_sync_time(ktime_t *device, *device = ktime_add_ns(*device, (wallclk_cycles * NSEC_PER_SEC) / ((HDA_MAX_CYCLE_VALUE + 1) * runtime->rate)); - *system = convert_art_to_tsc(tsc_counter); + system->cycles = tsc_counter; + system->cs_id = CSID_X86_ART; return 0; } From patchwork Mon May 13 10:38:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663299 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 48EC215216C; 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a="29039069" X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="29039069" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 May 2024 03:39:06 -0700 X-CSE-ConnectionGUID: vWKrWAPZRwC6eTwKb0O9dw== X-CSE-MsgGUID: RJzYPrC6S5Sxk+bsHPMx6w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="61481751" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:38:59 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 07/12] ice/ptp: remove convert_art_to_tsc() Date: Mon, 13 May 2024 16:08:08 +0530 Message-Id: <20240513103813.5666-8-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Thomas Gleixner The core code provides a mechanism to convert the ART base clock to the corresponding TSC value without requiring an architecture specific function. All what is required is to store the ART clocksoure ID and the cycles value in the provided system_counterval structure. Replace the direct conversion via convert_art_to_tsc() by filling in the required data. No functional change intended. Signed-off-by: Thomas Gleixner Signed-off-by: Lakshmi Sowjanya D --- drivers/net/ethernet/intel/ice/ice_ptp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c index c11eba07283c..c416dd2e6622 100644 --- a/drivers/net/ethernet/intel/ice/ice_ptp.c +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c @@ -2116,7 +2116,8 @@ ice_ptp_get_syncdevicetime(ktime_t *device, hh_ts_lo = rd32(hw, GLHH_ART_TIME_L); hh_ts_hi = rd32(hw, GLHH_ART_TIME_H); hh_ts = ((u64)hh_ts_hi << 32) | hh_ts_lo; - *system = convert_art_ns_to_tsc(hh_ts); + system->cycles = hh_ts; + system->cs_id = CSID_X86_ART; /* Read Device source clock time */ hh_ts_lo = rd32(hw, GLTSYN_HHTIME_L(tmr_idx)); hh_ts_hi = rd32(hw, GLTSYN_HHTIME_H(tmr_idx)); From patchwork Mon May 13 10:38:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663300 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4303314C5AA; 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a="29039100" X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="29039100" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 May 2024 03:39:12 -0700 X-CSE-ConnectionGUID: XIztl16ERtW6+ey3kxr0XA== X-CSE-MsgGUID: M6NhZ+exShu/uXbKAZzTdw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="61481772" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:39:06 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 08/12] x86/tsc: Remove art to tsc conversion functions which are obsolete Date: Mon, 13 May 2024 16:08:09 +0530 Message-Id: <20240513103813.5666-9-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lakshmi Sowjanya D The convert_art_to_tsc() and convert_art_ns_to_tsc() interfaces are no longer required. This conversion is internally done in get_device_system_crosststamp() using convert_base_to_cs(). Signed-off-by: Lakshmi Sowjanya D --- arch/x86/include/asm/tsc.h | 3 -- arch/x86/kernel/tsc.c | 60 -------------------------------------- 2 files changed, 63 deletions(-) diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h index 405efb3e4996..94408a784c8e 100644 --- a/arch/x86/include/asm/tsc.h +++ b/arch/x86/include/asm/tsc.h @@ -28,9 +28,6 @@ static inline cycles_t get_cycles(void) } #define get_cycles get_cycles -extern struct system_counterval_t convert_art_to_tsc(u64 art); -extern struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns); - extern void tsc_early_init(void); extern void tsc_init(void); extern void mark_tsc_unstable(char *reason); diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 45bf2f6d0ffa..5f0bd441ed4d 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -1297,66 +1297,6 @@ int unsynchronized_tsc(void) return 0; } -/* - * Convert ART to TSC given numerator/denominator found in detect_art() - */ -struct system_counterval_t convert_art_to_tsc(u64 art) -{ - u64 tmp, res, rem; - - rem = do_div(art, art_base_clk.denominator); - - res = art * art_base_clk.numerator; - tmp = rem * art_base_clk.numerator; - - do_div(tmp, art_base_clk.denominator); - res += tmp + art_base_clk.offset; - - return (struct system_counterval_t) { - .cs_id = have_art ? CSID_X86_TSC : CSID_GENERIC, - .cycles = res, - }; -} -EXPORT_SYMBOL(convert_art_to_tsc); - -/** - * convert_art_ns_to_tsc() - Convert ART in nanoseconds to TSC. - * @art_ns: ART (Always Running Timer) in unit of nanoseconds - * - * PTM requires all timestamps to be in units of nanoseconds. When user - * software requests a cross-timestamp, this function converts system timestamp - * to TSC. - * - * This is valid when CPU feature flag X86_FEATURE_TSC_KNOWN_FREQ is set - * indicating the tsc_khz is derived from CPUID[15H]. Drivers should check - * that this flag is set before conversion to TSC is attempted. - * - * Return: - * struct system_counterval_t - system counter value with the ID of the - * corresponding clocksource: - * cycles: System counter value - * cs_id: The clocksource ID for validating comparability - */ - -struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns) -{ - u64 tmp, res, rem; - - rem = do_div(art_ns, USEC_PER_SEC); - - res = art_ns * tsc_khz; - tmp = rem * tsc_khz; - - do_div(tmp, USEC_PER_SEC); - res += tmp; - - return (struct system_counterval_t) { - .cs_id = have_art ? CSID_X86_TSC : CSID_GENERIC, - .cycles = res, - }; -} -EXPORT_SYMBOL(convert_art_ns_to_tsc); - static void tsc_refine_calibration_work(struct work_struct *work); static DECLARE_DELAYED_WORK(tsc_irqwork, tsc_refine_calibration_work); /** From patchwork Mon May 13 10:38:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663301 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DFA6F1527A6; Mon, 13 May 2024 10:39:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715596761; cv=none; b=oEC/Az8/FUVubbUr9Et+obdX9J4g4DodazJvVcL4F72wc/ZrejnugbD2PeCxWu8L2Rl7LJx/9gmSI3qeF3fpWYOifYpmGgT77+yqN7YgPIA7Qg0yrNxTT4WIzDPNoJHTxN8Q8GrINuOxpuOXVoMV5zCzMNWoFOQVw4+QtgNVTb4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715596761; c=relaxed/simple; bh=IseBVxj7TxLQvtRm4JaluePpwuEWyzQwD7jXVspSW8Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=N4e9as4IJbCR+ER+B2UDHdecnaPNzWDK7OLCERgDr98c5xES073VokUrqLKUV1m/5gn8eHwP87DFAkP2fnQlB0vaOilFo/B7TizApLaW/DSq3hVMr7WLHovMzqsUtiJw+KNw3NWI9a1cIScp5J3Jt/KsqFoKn9fiFj37itoknGk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=GpbjqcSA; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="GpbjqcSA" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1715596760; x=1747132760; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=IseBVxj7TxLQvtRm4JaluePpwuEWyzQwD7jXVspSW8Q=; b=GpbjqcSA1oTJUsYB8iT4CzSgZY2sDfnmf1+KOKIOvT3REZNcN6j1IzNs aW+jZN5tGAYIDILdH7k+EG1bdcKKWuExv9vMEAMqwOZWg8AfCBG9XOMCA qSav92A0Ngnp8O3jclGbml4J4HHR0ClM7whKUv1I3ZpXCCpsJxU8Z/UMz qfzeHv7j051nHM02FuwY2HvAZeysPdyfY1zmjM6Q5EQJkTqSV5Drx/yNf 5F6oxa1B7B/RyZ7b18d6+dSZVXdIZMHI/O0zggAPFtjdms5NWm/rxbzGl u4VFNs8jjO3XZ4drd5yeNcSbtGyAtA8+kLVB8Xay1S9NniHb+Tw+KvMgE g==; X-CSE-ConnectionGUID: 1qTNattaSJiIwAyJLVdvAg== X-CSE-MsgGUID: KQYXtd9aRB6zObTqkp571A== X-IronPort-AV: E=McAfee;i="6600,9927,11071"; a="29039125" X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="29039125" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 May 2024 03:39:18 -0700 X-CSE-ConnectionGUID: La7vmDcuRxWg3TWG8mvhdg== X-CSE-MsgGUID: BjdCcZmkTfCuZkBZJA3emA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="61481793" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:39:12 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 09/12] timekeeping: Add function to convert realtime to base clock Date: Mon, 13 May 2024 16:08:10 +0530 Message-Id: <20240513103813.5666-10-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lakshmi Sowjanya D PPS (Pulse Per Second) generates a hardware pulse every second based on CLOCK_REALTIME. This works fine when the pulse is generated in software from a hrtimer callback function. For hardware which generates the pulse by programming a timer it's required to convert CLOCK_REALTIME to the underlying hardware clock. The X86 Timed IO device is based on the Always Running Timer (ART), which is the base clock of the TSC, which is usually the system clocksource on X86. The core code already has functionality to convert base clock timestamps to system clocksource timestamps, but there is no support for converting the other way around. Provide the required functionality to support such devices in a generic way to avoid code duplication in drivers: 1) ktime_real_to_base_clock() to convert a CLOCK_REALTIME timestamp to a base clock timestamp 2) timekeeping_clocksource_has_base() to allow drivers to validate that the system clocksource is based on a particular clocksource ID. Co-developed-by: Thomas Gleixner Signed-off-by: Thomas Gleixner Co-developed-by: Christopher S. Hall Signed-off-by: Christopher S. Hall Signed-off-by: Lakshmi Sowjanya D --- include/linux/timekeeping.h | 4 ++ kernel/time/timekeeping.c | 86 +++++++++++++++++++++++++++++++++++++ 2 files changed, 90 insertions(+) diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index b2ee182d891e..fc12a9ba2c88 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -318,6 +318,10 @@ struct system_counterval_t { bool use_nsecs; }; +extern bool ktime_real_to_base_clock(ktime_t treal, + enum clocksource_ids base_id, u64 *cycles); +extern bool timekeeping_clocksource_has_base(enum clocksource_ids id); + /* * Get cross timestamp between system clock and device clock */ diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 92994450f268..326db459a2ea 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -1229,6 +1229,64 @@ static bool convert_base_to_cs(struct system_counterval_t *scv) return true; } +static bool convert_cs_to_base(u64 *cycles, enum clocksource_ids base_id) +{ + struct clocksource *cs = tk_core.timekeeper.tkr_mono.clock; + struct clocksource_base *base = cs->base; + + /* Check whether base_id matches the base clock */ + if (!base || base->id != base_id) + return false; + + *cycles -= base->offset; + if (!convert_clock(cycles, base->denominator, base->numerator)) + return false; + return true; +} + +static bool convert_ns_to_cs(u64 *delta) +{ + struct tk_read_base *tkr = &tk_core.timekeeper.tkr_mono; + + if (BITS_TO_BYTES(fls64(*delta) + tkr->shift) >= sizeof(*delta)) + return false; + + *delta = div_u64((*delta << tkr->shift) - tkr->xtime_nsec, tkr->mult); + return true; +} + +/** + * ktime_real_to_base_clock() - Convert CLOCK_REALTIME timestamp to a base clock timestamp + * @treal: CLOCK_REALTIME timestamp to convert + * @base_id: base clocksource id + * @cycles: pointer to store the converted base clock timestamp + * + * Converts a supplied, future realtime clock value to the corresponding base clock value. + * + * Return: true if the conversion is successful, false otherwise. + */ +bool ktime_real_to_base_clock(ktime_t treal, enum clocksource_ids base_id, u64 *cycles) +{ + struct timekeeper *tk = &tk_core.timekeeper; + unsigned int seq; + u64 delta; + + do { + seq = read_seqcount_begin(&tk_core.seq); + if ((u64)treal < tk->tkr_mono.base_real) + return false; + delta = (u64)treal - tk->tkr_mono.base_real; + if (!convert_ns_to_cs(&delta)) + return false; + *cycles = tk->tkr_mono.cycle_last + delta; + if (!convert_cs_to_base(cycles, base_id)) + return false; + } while (read_seqcount_retry(&tk_core.seq, seq)); + + return true; +} +EXPORT_SYMBOL_GPL(ktime_real_to_base_clock); + /** * get_device_system_crosststamp - Synchronously capture system/device timestamp * @get_time_fn: Callback to get simultaneous device time and @@ -1340,6 +1398,34 @@ int get_device_system_crosststamp(int (*get_time_fn) } EXPORT_SYMBOL_GPL(get_device_system_crosststamp); +/** + * timekeeping_clocksource_has_base - Check whether the current clocksource + * is based on given a base clock + * @id: base clocksource ID + * + * Note: The return value is a snapshot which can become invalid right + * after the function returns. + * + * Return: true if the timekeeper clocksource has a base clock with @id, + * false otherwise + */ +bool timekeeping_clocksource_has_base(enum clocksource_ids id) +{ + unsigned int seq; + bool ret; + + do { + seq = read_seqcount_begin(&tk_core.seq); + if (tk_core.timekeeper.tkr_mono.clock->base) + ret = (tk_core.timekeeper.tkr_mono.clock->base->id == id); + else + ret = false; + } while (read_seqcount_retry(&tk_core.seq, seq)); + + return ret; +} +EXPORT_SYMBOL_GPL(timekeeping_clocksource_has_base); + /** * do_settimeofday64 - Sets the time of day. * @ts: pointer to the timespec64 variable containing the new time From patchwork Mon May 13 10:38:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D, Lakshmi Sowjanya" X-Patchwork-Id: 13663302 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 927C11474AF; Mon, 13 May 2024 10:39:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; 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13 May 2024 03:39:25 -0700 X-CSE-ConnectionGUID: VrNB7M9rQIu2CkDCyHRTFA== X-CSE-MsgGUID: EINp1KiERKuReZhDIG6e9w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,158,1712646000"; d="scan'208";a="61481839" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:39:19 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 10/12] pps: generators: Add PPS Generator TIO Driver Date: Mon, 13 May 2024 16:08:11 +0530 Message-Id: <20240513103813.5666-11-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lakshmi Sowjanya D The Intel Timed IO PPS generator driver outputs a PPS signal using dedicated hardware that is more accurate than software actuated PPS. The Timed IO hardware generates output events using the ART timer. The ART timer period varies based on platform type, but is less than 100 nanoseconds for all current platforms. Timed IO output accuracy is within 1 ART period. PPS output is enabled by writing '1' the 'enable' sysfs attribute. The driver uses hrtimers to schedule a wake-up 10 ms before each event (edge) target time. At wakeup, the driver converts the target time in terms of CLOCK_REALTIME to ART trigger time and writes this to the Timed IO hardware. The Timed IO hardware generates an event precisely at the requested system time without software involvement. Co-developed-by: Christopher Hall Signed-off-by: Christopher Hall Co-developed-by: Pandith N Signed-off-by: Pandith N Co-developed-by: Thejesh Reddy T R Signed-off-by: Thejesh Reddy T R Signed-off-by: Lakshmi Sowjanya D Reviewed-by: Eddie Dong Reviewed-by: Andy Shevchenko Acked-by: Rodolfo Giometti --- drivers/pps/generators/Kconfig | 16 ++ drivers/pps/generators/Makefile | 1 + drivers/pps/generators/pps_gen_tio.c | 259 +++++++++++++++++++++++++++ 3 files changed, 276 insertions(+) create mode 100644 drivers/pps/generators/pps_gen_tio.c diff --git a/drivers/pps/generators/Kconfig b/drivers/pps/generators/Kconfig index d615e640fcad..0f090932336f 100644 --- a/drivers/pps/generators/Kconfig +++ b/drivers/pps/generators/Kconfig @@ -12,3 +12,19 @@ config PPS_GENERATOR_PARPORT If you say yes here you get support for a PPS signal generator which utilizes STROBE pin of a parallel port to send PPS signals. It uses parport abstraction layer and hrtimers to precisely control the signal. + +config PPS_GENERATOR_TIO + tristate "TIO PPS signal generator" + depends on X86 && CPU_SUP_INTEL + help + If you say yes here you get support for a PPS TIO signal generator + which generates a pulse at a prescribed time based on the system clock. + It uses time translation and hrtimers to precisely generate a pulse. + This hardware is present on 2019 and newer Intel CPUs. However, this + driver is not useful without adding highly specialized hardware outside + the Linux system to observe these pulses. + + To compile this driver as a module, choose M here: the module + will be called pps_gen_tio. + + If unsure, say N. diff --git a/drivers/pps/generators/Makefile b/drivers/pps/generators/Makefile index 2589fd0f2481..714e847ae193 100644 --- a/drivers/pps/generators/Makefile +++ b/drivers/pps/generators/Makefile @@ -4,5 +4,6 @@ # obj-$(CONFIG_PPS_GENERATOR_PARPORT) += pps_gen_parport.o +obj-$(CONFIG_PPS_GENERATOR_TIO) += pps_gen_tio.o ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG diff --git a/drivers/pps/generators/pps_gen_tio.c b/drivers/pps/generators/pps_gen_tio.c new file mode 100644 index 000000000000..c6b7f13ffeca --- /dev/null +++ b/drivers/pps/generators/pps_gen_tio.c @@ -0,0 +1,259 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel PPS signal Generator Driver + * + * Copyright (C) 2024 Intel Corporation + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define TIOCTL 0x00 +#define TIOCOMPV 0x10 +#define TIOEC 0x30 + +/* Control Register */ +#define TIOCTL_EN BIT(0) +#define TIOCTL_DIR BIT(1) +#define TIOCTL_EP GENMASK(3, 2) +#define TIOCTL_EP_RISING_EDGE FIELD_PREP(TIOCTL_EP, 0) +#define TIOCTL_EP_FALLING_EDGE FIELD_PREP(TIOCTL_EP, 1) +#define TIOCTL_EP_TOGGLE_EDGE FIELD_PREP(TIOCTL_EP, 2) + +#define SAFE_TIME_NS (10 * NSEC_PER_MSEC) /* Safety time to set hrtimer early */ +#define MAGIC_CONST (NSEC_PER_SEC - SAFE_TIME_NS) +#define ART_HW_DELAY_CYCLES 2 + +struct pps_tio { + struct hrtimer timer; + struct device *dev; + spinlock_t lock; + struct attribute_group attrs; + void __iomem *base; + bool enabled; + u32 prev_count; +}; + +static inline u32 pps_tio_read(struct pps_tio *tio, u32 offset) +{ + return readl(tio->base + offset); +} + +static inline void pps_ctl_write(struct pps_tio *tio, u32 value) +{ + writel(value, tio->base + TIOCTL); +} + +/* For COMPV register, It's safer to write higher 32-bit followed by lower 32-bit */ +static inline void pps_compv_write(struct pps_tio *tio, u64 value) +{ + hi_lo_writeq(value, tio->base + TIOCOMPV); +} + +static inline ktime_t first_event(struct pps_tio *tio) +{ + return ktime_set(ktime_get_real_seconds() + 1, MAGIC_CONST); +} + +static u32 pps_tio_disable(struct pps_tio *tio) +{ + u32 ctrl; + + ctrl = pps_tio_read(tio, TIOCTL); + pps_compv_write(tio, 0); + + ctrl &= ~TIOCTL_EN; + pps_ctl_write(tio, ctrl); + tio->prev_count = 0; + + return ctrl; +} + +static void pps_tio_direction_output(struct pps_tio *tio) +{ + u32 ctrl; + + ctrl = pps_tio_disable(tio); + + /* We enable the device, be sure that the 'compare' value is invalid */ + pps_compv_write(tio, 0); + + ctrl &= ~(TIOCTL_DIR | TIOCTL_EP); + ctrl |= TIOCTL_EP_TOGGLE_EDGE; + pps_ctl_write(tio, ctrl); + + ctrl |= TIOCTL_EN; + pps_ctl_write(tio, ctrl); +} + +static bool pps_generate_next_pulse(struct pps_tio *tio, ktime_t expires) +{ + u64 art; + + if (!ktime_real_to_base_clock(expires, CSID_X86_ART, &art)) { + pps_tio_disable(tio); + return false; + } + + pps_compv_write(tio, art - ART_HW_DELAY_CYCLES); + return true; +} + +static enum hrtimer_restart hrtimer_callback(struct hrtimer *timer) +{ + struct pps_tio *tio = container_of(timer, struct pps_tio, timer); + ktime_t expires, now; + u32 event_count; + + guard(spinlock)(&tio->lock); + + /* Check if any event is missed. If an event is missed, TIO will be disabled*/ + event_count = pps_tio_read(tio, TIOEC); + if (tio->prev_count && tio->prev_count == event_count) + goto err; + tio->prev_count = event_count; + expires = hrtimer_get_expires(timer); + now = ktime_get_real(); + + if (now - expires >= SAFE_TIME_NS) + goto err; + + if (!pps_generate_next_pulse(tio, expires + SAFE_TIME_NS)) + return HRTIMER_NORESTART; + + hrtimer_forward(timer, now, NSEC_PER_SEC / 2); + return HRTIMER_RESTART; +err: + dev_err(tio->dev, "Event missed, Disabling Timed I/O"); + pps_tio_disable(tio); + return HRTIMER_NORESTART; +} + +static ssize_t enable_store(struct device *dev, struct device_attribute *attr, const char *buf, + size_t count) +{ + struct pps_tio *tio = dev_get_drvdata(dev); + bool enable; + int err; + + err = kstrtobool(buf, &enable); + if (err) + return err; + + guard(spinlock_irqsave)(&tio->lock); + if (enable && !tio->enabled) { + if (!timekeeping_clocksource_has_base(CSID_X86_ART)) { + dev_err(tio->dev, "PPS cannot be started as clock is not related to ART"); + return -EPERM; + } + pps_tio_direction_output(tio); + hrtimer_start(&tio->timer, first_event(tio), HRTIMER_MODE_ABS); + tio->enabled = true; + } else if (!enable && tio->enabled) { + hrtimer_cancel(&tio->timer); + pps_tio_disable(tio); + tio->enabled = false; + } + return count; +} + +static ssize_t enable_show(struct device *dev, struct device_attribute *devattr, char *buf) +{ + struct pps_tio *tio = dev_get_drvdata(dev); + u32 ctrl; + + ctrl = pps_tio_read(tio, TIOCTL); + ctrl &= TIOCTL_EN; + + return sysfs_emit(buf, "%u\n", ctrl); +} +static DEVICE_ATTR_RW(enable); + +static struct attribute *pps_tio_attrs[] = { + &dev_attr_enable.attr, + NULL +}; +ATTRIBUTE_GROUPS(pps_tio); + +static int pps_tio_probe(struct platform_device *pdev) +{ + struct pps_tio *tio; + + if (!(cpu_feature_enabled(X86_FEATURE_TSC_KNOWN_FREQ) && + cpu_feature_enabled(X86_FEATURE_ART))) { + dev_warn(&pdev->dev, "TSC/ART is not enabled"); + return -ENODEV; + } + + tio = devm_kzalloc(&pdev->dev, sizeof(*tio), GFP_KERNEL); + if (!tio) + return -ENOMEM; + + tio->dev = &pdev->dev; + tio->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(tio->base)) + return PTR_ERR(tio->base); + + pps_tio_disable(tio); + hrtimer_init(&tio->timer, CLOCK_REALTIME, HRTIMER_MODE_ABS); + tio->timer.function = hrtimer_callback; + spin_lock_init(&tio->lock); + tio->enabled = false; + platform_set_drvdata(pdev, tio); + + return 0; +} + +static int pps_tio_remove(struct platform_device *pdev) +{ + struct pps_tio *tio = platform_get_drvdata(pdev); + + hrtimer_cancel(&tio->timer); + pps_tio_disable(tio); + + return 0; +} + +static const struct acpi_device_id intel_pmc_tio_acpi_match[] = { + { "INTC1021" }, + { "INTC1022" }, + { "INTC1023" }, + { "INTC1024" }, + {} +}; +MODULE_DEVICE_TABLE(acpi, intel_pmc_tio_acpi_match); + +static struct platform_driver pps_tio_driver = { + .probe = pps_tio_probe, + .remove = pps_tio_remove, + .driver = { + .name = "intel-pps-generator", + .acpi_match_table = intel_pmc_tio_acpi_match, + .dev_groups = pps_tio_groups, + }, +}; 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d="scan'208";a="61481873" Received: from inlubt0316.iind.intel.com ([10.191.20.213]) by fmviesa001.fm.intel.com with ESMTP; 13 May 2024 03:39:25 -0700 From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v8 11/12] Documentation: driver-api: pps: Add Intel Timed I/O PPS generator Date: Mon, 13 May 2024 16:08:12 +0530 Message-Id: <20240513103813.5666-12-lakshmi.sowjanya.d@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> References: <20240513103813.5666-1-lakshmi.sowjanya.d@intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lakshmi Sowjanya D Add Intel Timed I/O PPS usage instructions. Co-developed-by: Pandith N Signed-off-by: Pandith N Signed-off-by: Lakshmi Sowjanya D Reviewed-by: Andy Shevchenko Acked-by: Rodolfo Giometti --- Documentation/driver-api/pps.rst | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/Documentation/driver-api/pps.rst b/Documentation/driver-api/pps.rst index 78dded03e5d8..52a6d5faf885 100644 --- a/Documentation/driver-api/pps.rst +++ b/Documentation/driver-api/pps.rst @@ -246,3 +246,25 @@ delay between assert and clear edge as small as possible to reduce system latencies. But if it is too small slave won't be able to capture clear edge transition. The default of 30us should be good enough in most situations. The delay can be selected using 'delay' pps_gen_parport module parameter. + + +Intel Timed I/O PPS signal generator +------------------------------------ + +Intel Timed I/O is a high precision device, present on 2019 and newer Intel +CPUs, that can generate PPS signals. + +Timed I/O and system time are both driven by same hardware clock. The signal +is generated with a precision of ~20 nanoseconds. The generated PPS signal +is used to synchronize an external device with system clock. For example, +share your clock with a device that receives PPS signal, generated by +Timed I/O device. 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Signed-off-by: Lakshmi Sowjanya D --- Documentation/ABI/testing/sysfs-platform-pps-tio | 7 +++++++ MAINTAINERS | 1 + 2 files changed, 8 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-platform-pps-tio diff --git a/Documentation/ABI/testing/sysfs-platform-pps-tio b/Documentation/ABI/testing/sysfs-platform-pps-tio new file mode 100644 index 000000000000..74f3244b55dc --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-pps-tio @@ -0,0 +1,7 @@ +What: /sys/devices/platform/INTCxxxx/enable +Date: June 2024 +KernelVersion: 6.11 +Contact: Lakshmi Sowjanya D +Description: + (RW) Enable or disable PPS TIO generator output, read to + see the status of hardware (Enabled/Disabled). diff --git a/MAINTAINERS b/MAINTAINERS index 28e20975c26f..97606c072e3f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17670,6 +17670,7 @@ M: Rodolfo Giometti L: linuxpps@ml.enneenne.com (subscribers-only) S: Maintained W: http://wiki.enneenne.com/index.php/LinuxPPS_support +F: Documentation/ABI/testing/sysfs-platform-pps-tio F: Documentation/ABI/testing/sysfs-pps F: Documentation/devicetree/bindings/pps/pps-gpio.yaml F: Documentation/driver-api/pps.rst