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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D551FCF31B5 for ; Wed, 19 Nov 2025 12:23:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=H7kLEo/ZPevyWQim595uhEmJrimvmhaebA3j+KXGe/8=; b=a04Iin03fpSMBjldzc/5w84zic fTF3jk70HRfiAY5Boiw/0tx9dTWrevMQZXTkTkCfRq8kKU8oaWciTRV4bvwe3z5898Wevd5CpadnI 9LnHm1/0qEVByPExttVwwqa6mEDFV8Oyej8ZXHCwJlAe/qceAhZKanw+RDc6dyFUXXDqfksauLofr UjYJluYIeoyS4otuXi4a476yKzAJW/YSEvGipjZlf59ahxEjYq9knTc44p9W+oZql77jZ/HnDsGHY pA3HPCVGxszg5VNd5hkrJrS+E8BFHBl8g8uh7QjTW2nxTRTzlvfngTNDoc6cWgIl9g3P+iZTI4Fgl XfMLzSDA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vLhDh-000000036gU-1v28; Wed, 19 Nov 2025 12:23:33 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vLhDe-000000036g9-28MF for linux-arm-kernel@lists.infradead.org; Wed, 19 Nov 2025 12:23:32 +0000 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 AEFF9FEC; Wed, 19 Nov 2025 04:23:20 -0800 (PST) Received: from e134344.cambridge.arm.com (e134344.arm.com [10.1.196.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 4FF173F740; Wed, 19 Nov 2025 04:23:23 -0800 (PST) From: Ben Horgan To: james.morse@arm.com Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, bobo.shaobowang@huawei.com, carl@os.amperecomputing.com, catalin.marinas@arm.com, dakr@kernel.org, dave.martin@arm.com, david@redhat.com, dfustini@baylibre.com, fenghuay@nvidia.com, gregkh@linuxfoundation.org, gshan@redhat.com, guohanjun@huawei.com, jeremy.linton@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, lpieralisi@kernel.org, peternewman@google.com, quic_jiles@quicinc.com, rafael@kernel.org, robh@kernel.org, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, sudeep.holla@arm.com, tan.shaopeng@fujitsu.com, will@kernel.org, xhao@linux.alibaba.com, reinette.chatre@intel.com, Ben Horgan Subject: [PATCH v6 00/34] arm_mpam: Add basic mpam driver Date: Wed, 19 Nov 2025 12:22:30 +0000 Message-ID: <20251119122305.302149-1-ben.horgan@arm.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251119_042330_657364_493224B2 X-CRM114-Status: GOOD ( 23.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi all, Just a handful of minor changes based on v5 review comments. See individual patches for change lgos. I haven't asked James to host any branches for this revision but please let me know if this would be helpful to anyone. Thanks for all the help with reviews and testing. Previous cover letter from James: This is just enough MPAM driver for ACPI. DT got ripped out. If you need DT support - please share your DTS so the DT folk know the binding is what is needed. This doesn't contain any of the resctrl code, meaning you can't actually drive it from user-space yet. Because of that, its hidden behind CONFIG_EXPERT. This will change once the user interface is connected up. This is the initial group of patches that allows the resctrl code to be built on top. Including that will increase the number of trees that may need to coordinate, so breaking it up make sense. The locking got simplified, but is still strange - this is because of the 'mpam-fb' firmware interface specification that is still alpha. That thing needs to wait for an interrupt after every system register write, which significantly impacts the driver. Some features just won't work, e.g. reading the monitor registers via perf. I've not found a platform that can test all the behaviours around the monitors, so this is where I'd expect the most bugs. The MPAM spec that describes all the system and MMIO registers can be found here: https://developer.arm.com/documentation/ddi0598/db/?lang=en (Ignored the 'RETIRED' warning - that is just arm moving the documentation around. This document has the best overview) The expectation is this will go via the arm64 tree. This series is based on v6.18-rc4, and can be retrieved from: (no v6 version) https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/driver/v5 The rest of the driver can be found here: (no v6 version) https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v6.18-rc4-v5 What is MPAM? Set your time-machine to 2020: https://lore.kernel.org/lkml/20201030161120.227225-1-james.morse@arm.com/ Ben Horgan (5): ACPI / PPTT: Add acpi_pptt_cache_v1_full to use pptt cache as one structure platform: Define platform_device_put cleanup handler ACPI: Define acpi_put_table cleanup handler and acpi_get_table_pointer() helper arm_mpam: Consider overflow in bandwidth counter state MAINTAINERS: new entry for MPAM Driver James Morse (27): ACPI / PPTT: Add a helper to fill a cpumask from a processor container ACPI / PPTT: Stop acpi_count_levels() expecting callers to clear levels ACPI / PPTT: Find cache level by cache-id ACPI / PPTT: Add a helper to fill a cpumask from a cache_id arm64: kconfig: Add Kconfig entry for MPAM ACPI / MPAM: Parse the MPAM table arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate arm_mpam: Add the class and component structures for firmware described ris arm_mpam: Add MPAM MSC register layout definitions arm_mpam: Add cpuhp callbacks to probe MSC hardware arm_mpam: Probe hardware to find the supported partid/pmg values arm_mpam: Add helpers for managing the locking around the mon_sel registers arm_mpam: Probe the hardware features resctrl supports arm_mpam: Merge supported features during mpam_enable() into mpam_class arm_mpam: Reset MSC controls from cpuhp callbacks arm_mpam: Add a helper to touch an MSC from any CPU arm_mpam: Extend reset logic to allow devices to be reset any time arm_mpam: Register and enable IRQs arm_mpam: Use a static key to indicate when mpam is enabled arm_mpam: Allow configuration to be applied and restored during cpu online arm_mpam: Probe and reset the rest of the features arm_mpam: Add helpers to allocate monitors arm_mpam: Add mpam_msmon_read() to read monitor value arm_mpam: Track bandwidth counter state for power management arm_mpam: Add helper to reset saved mbwu state arm_mpam: Add kunit test for bitmap reset arm_mpam: Add kunit tests for props_mismatch() Rohit Mathew (2): arm_mpam: Probe for long/lwd mbwu counters arm_mpam: Use long MBWU counters if supported MAINTAINERS | 10 + arch/arm64/Kconfig | 25 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/acpi/arm64/Kconfig | 3 + drivers/acpi/arm64/Makefile | 1 + drivers/acpi/arm64/mpam.c | 411 ++++ drivers/acpi/pptt.c | 280 ++- drivers/acpi/tables.c | 2 +- drivers/resctrl/Kconfig | 24 + drivers/resctrl/Makefile | 4 + drivers/resctrl/mpam_devices.c | 2723 +++++++++++++++++++++++++++ drivers/resctrl/mpam_internal.h | 658 +++++++ drivers/resctrl/test_mpam_devices.c | 389 ++++ include/linux/acpi.h | 26 + include/linux/arm_mpam.h | 66 + include/linux/platform_device.h | 1 + 17 files changed, 4608 insertions(+), 18 deletions(-) create mode 100644 drivers/acpi/arm64/mpam.c create mode 100644 drivers/resctrl/Kconfig create mode 100644 drivers/resctrl/Makefile create mode 100644 drivers/resctrl/mpam_devices.c create mode 100644 drivers/resctrl/mpam_internal.h create mode 100644 drivers/resctrl/test_mpam_devices.c create mode 100644 include/linux/arm_mpam.h -- 2.43.0