From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 1583B779E4 for ; Tue, 12 Mar 2024 08:35:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710232509; cv=none; b=SQaOsTIOaEi0U8VRgMUS5Y3chGwJuvcfzQxP4vYUQWDz4Md1jhyO2EzjJupQbga6g5G731sfc06uvwUPKOzV51YLWjZAj6bV0rwrUP1v3uDCPuMB5uX6se6wMfzM+NFYCDDJ5xdSeZTRym3wTxwTdyBP8WrKO0CSu7djiT/gcA0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710232509; c=relaxed/simple; bh=gsfSeC1YLbyxRfbDKgs8J90ICDzH9w8rykID/VZwCPE=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=bkFgtlRGbMWhLX02li2N2uQxqZLjLdGtfLX5KuEDrh3p5xq0xGyD4x72apCcjRHaZpSvqX/tuQokCR0vSM8EduKeu0LiHKKSsWv8M18KL6FdNxThPsIygVXLqbnlC7Du1IGEVxH6zvn6sizUXdDJK0U2oZgsKV0m4B+kjH+99bk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 54B201007; Tue, 12 Mar 2024 01:35:43 -0700 (PDT) Received: from e125905.cambridge.arm.com (e125905.cambridge.arm.com [10.1.194.73]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 7CBA33F73F; Tue, 12 Mar 2024 01:35:04 -0700 (PDT) From: Beata Michalska To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, ionela.voinescu@arm.com, vanshikonda@os.amperecomputing.com Cc: sudeep.holla@arm.com, will@kernel.org, catalin.marinas@arm.com, vincent.guittot@linaro.org, sumitg@nvidia.com, yang@os.amperecomputing.com, lihuisong@huawei.com Subject: [PATCH v3 0/3] Add support for AArch64 AMUv1-based arch_freq_get_on_cpu Date: Tue, 12 Mar 2024 08:34:28 +0000 Message-Id: <20240312083431.3239989-1-beata.michalska@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Introducing arm64 specific version of arch_freq_get_on_cpu, cashing on existing implementation for FIE and AMUv1 support: the frequency scale factor, updated on each sched tick, serves as a base for retrieving the frequency for a given CPU, representing an average frequency reported between the ticks - thus its accuracy is limited. The changes have been rather lightly (due to some limitations) tested on an FVP model. Relevant discussions: [1] https://lore.kernel.org/all/20240229162520.970986-1-vanshikonda@os.amperecomputing.com/ [2] https://lore.kernel.org/all/7eozim2xnepacnnkzxlbx34hib4otycnbn4dqymfziqou5lw5u@5xzpv3t7sxo3/ [3] https://lore.kernel.org/all/20231212072617.14756-1-lihuisong@huawei.com/ [4] https://lore.kernel.org/lkml/ZIHpd6unkOtYVEqP@e120325.cambridge.arm.com/T/#m4e74cb5a0aaa353c60fedc6cfb95ab7a6e381e3c v3: - dropping changes to cpufreq_verify_current_freq - pulling in changes from Ionela initializing capacity_freq_ref to 0 (thanks for that!) and applying suggestions made by her during last review: - switching to arch_scale_freq_capacity and arch_scale_freq_ref when reversing freq scale factor computation - swapping shift with multiplication - adding time limit for considering last scale update as valid - updating frequency scale factor upon entering idle v2: - Splitting the patches - Adding comment for full dyntick mode - Plugging arch_freq_get_on_cpu into cpufreq_verify_current_freq instead of in show_cpuinfo_cur_freq to allow the framework to stay more in sync with potential freq changes Beata Michalska (2): arm64: Provide an AMU-based version of arch_freq_get_on_cpu arm64: Update AMU-based frequency scale factor on entering idle Ionela Voinescu (1): arch_topology: init capacity_freq_ref to 0 arch/arm64/kernel/topology.c | 116 +++++++++++++++++++++++++++++++---- drivers/base/arch_topology.c | 8 ++- 2 files changed, 110 insertions(+), 14 deletions(-) -- 2.25.1