From nobody Mon Feb 9 19:05:42 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 261AE37107F; Tue, 3 Feb 2026 21:45:34 +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=1770155135; cv=none; b=m9aVtJVXRObypd0Twc1f8dwAyhiDqxbCjOCl8qPRaFGVDFxDfY8lfRMa1Ds4OPJF7WYR8RWWzYwpC5rWFQ4C5PD81qwYj9G9L48gQRGMmbyGbqLx/b2VUYaKoaIJ8b743O/hEz6P+bL7lVpC7ThYPnVfrlZ+TDZmKLWZ4O4NTCQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770155135; c=relaxed/simple; bh=03HMlr5YT/YpkyMeh6H9mXUvQ5CDummroAAEiQGkVzM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UVj6awP30VflDdSFPynu7tbs/QRn5HKXS8Vwk7GonbRbB3Dsy0pS0S+QL2Pbv3ZF1/MWuogmLa1HgQJgMKti4z+x566v17JyajBhWWGMlqbmRA3bMGUexkMY4WZaxHGEI4w9dfyGT5Xlgu/Rh6z/n9JKfa5tLMxM/AXJEUmSaTo= 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 41159339; Tue, 3 Feb 2026 13:45:27 -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 193643F778; Tue, 3 Feb 2026 13:45:27 -0800 (PST) From: Ben Horgan To: ben.horgan@arm.com Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, carl@os.amperecomputing.com, dave.martin@arm.com, david@kernel.org, dfustini@baylibre.com, fenghuay@nvidia.com, gshan@redhat.com, james.morse@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, peternewman@google.com, punit.agrawal@oss.qualcomm.com, quic_jiles@quicinc.com, reinette.chatre@intel.com, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, tan.shaopeng@fujitsu.com, xhao@linux.alibaba.com, catalin.marinas@arm.com, will@kernel.org, corbet@lwn.net, maz@kernel.org, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, kvmarm@lists.linux.dev, zengheng4@huawei.com, linux-doc@vger.kernel.org, Shaopeng Tan Subject: [PATCH v4 16/41] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() Date: Tue, 3 Feb 2026 21:43:17 +0000 Message-ID: <20260203214342.584712-17-ben.horgan@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260203214342.584712-1-ben.horgan@arm.com> References: <20260203214342.584712-1-ben.horgan@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: quoted-printable Content-Type: text/plain; charset="utf-8" From: James Morse We already have a helper for resetting an mpam class and component. Hook it up to resctrl_arch_reset_all_ctrls() and the domain offline path. Tested-by: Gavin Shan Tested-by: Shaopeng Tan Tested-by: Peter Newman Cc: Zeng Heng Signed-off-by: James Morse Signed-off-by: Ben Horgan --- Changes since v2: Don't expose unlocked reset Changes since v3: Don't use or expose mpam_reset_component_locked() --- drivers/resctrl/mpam_devices.c | 2 +- drivers/resctrl/mpam_internal.h | 3 +++ drivers/resctrl/mpam_resctrl.c | 13 +++++++++++++ 3 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index b81d5c7f44ca..bf99c37a80a7 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -2568,7 +2568,7 @@ static void mpam_reset_component_locked(struct mpam_c= omponent *comp) } } =20 -static void mpam_reset_class_locked(struct mpam_class *class) +void mpam_reset_class_locked(struct mpam_class *class) { struct mpam_component *comp; =20 diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_interna= l.h index a9d89d9e18a8..21ade1620147 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -389,6 +389,9 @@ extern u8 mpam_pmg_max; void mpam_enable(struct work_struct *work); void mpam_disable(struct work_struct *work); =20 +/* Reset all the RIS in a class under cpus_read_lock() */ +void mpam_reset_class_locked(struct mpam_class *class); + int mpam_apply_config(struct mpam_component *comp, u16 partid, struct mpam_config *cfg); =20 diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c index a59d1659fe12..7fc0b515cfa4 100644 --- a/drivers/resctrl/mpam_resctrl.c +++ b/drivers/resctrl/mpam_resctrl.c @@ -169,6 +169,19 @@ static int mpam_resctrl_pick_domain_id(int cpu, struct= mpam_component *comp) return comp->comp_id; } =20 +void resctrl_arch_reset_all_ctrls(struct rdt_resource *r) +{ + struct mpam_resctrl_res *res; + + lockdep_assert_cpus_held(); + + if (!mpam_is_enabled()) + return; + + res =3D container_of(r, struct mpam_resctrl_res, resctrl_res); + mpam_reset_class_locked(res->class); +} + static void mpam_resctrl_domain_hdr_init(int cpu, struct mpam_component *c= omp, struct rdt_domain_hdr *hdr) { --=20 2.43.0