From nobody Tue Dec 16 14:49:52 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 89A0C273D84 for ; Fri, 5 Dec 2025 22:00:05 +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=1764972008; cv=none; b=oNT90cyLei+Mk22ETlmbUtaibHdNAHUGUprPNuCE0JqtWmOhgsXCw8qJ4eY/yRTVS12/jE+bQVeLT1G7OkyIDQncw8Gc/IOH8J/oVc6XdRxajrTIgm0vkZl0wAAnZktO5OoiosfK1dLlzsA9wuocQsoVfVZgyhWJRf3sI7+1c6Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764972008; c=relaxed/simple; bh=r7lfPkMofMVVMx0hNcPc0ncL5ZU2iXGg2D/NL0lwA0A=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=I8Hn9SkiLhgwyBMjtNOWmx+xYmIosfSymR8mB7kCAf7ppW7HxtBZqnETO9Hiv6tLUMq5MVMcBAkBSHjfvrMtriZz2ibLle+MDaPLID/oA4QqMht9h0s7Wi79fcwBvDf6mFvinD0PyEJQqYB7xaNDxnfeHMVL19OJbFZ5drZRHJc= 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 75CB61BA8; Fri, 5 Dec 2025 13:59:57 -0800 (PST) Received: from merodach.members.linode.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 072763F740; Fri, 5 Dec 2025 14:00:00 -0800 (PST) From: James Morse To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: James Morse , D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Dave Martin , Koba Ko , Shanker Donthineni , fenghuay@nvidia.com, baisheng.gao@unisoc.com, Jonathan Cameron , Gavin Shan , Ben Horgan , rohit.mathew@arm.com, reinette.chatre@intel.com, Punit Agrawal Subject: [RFC PATCH 09/38] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() Date: Fri, 5 Dec 2025 21:58:32 +0000 Message-Id: <20251205215901.17772-10-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20251205215901.17772-1-james.morse@arm.com> References: <20251205215901.17772-1-james.morse@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" 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. Signed-off-by: James Morse --- drivers/resctrl/mpam_devices.c | 6 +++--- drivers/resctrl/mpam_internal.h | 7 +++++++ drivers/resctrl/mpam_resctrl.c | 15 +++++++++++++++ 3 files changed, 25 insertions(+), 3 deletions(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index efaf7633bc35..fccebfd980d8 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -2543,7 +2543,7 @@ static void mpam_enable_once(void) mpam_partid_max + 1, mpam_pmg_max + 1); } =20 -static void mpam_reset_component_locked(struct mpam_component *comp) +void mpam_reset_component_locked(struct mpam_component *comp) { struct mpam_vmsc *vmsc; =20 @@ -2567,7 +2567,7 @@ 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 @@ -2579,7 +2579,7 @@ static void mpam_reset_class_locked(struct mpam_class= *class) mpam_reset_component_locked(comp); } =20 -static void mpam_reset_class(struct mpam_class *class) +void mpam_reset_class(struct mpam_class *class) { cpus_read_lock(); mpam_reset_class_locked(class); diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_interna= l.h index dfd3512ac924..8684bd35d4ab 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -392,6 +392,13 @@ 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, optionally while holding cpus_read_lock()= */ +void mpam_reset_class_locked(struct mpam_class *class); +void mpam_reset_class(struct mpam_class *class); + +/* Reset all the RIS in a component under cpus_read_lock() */ +void mpam_reset_component_locked(struct mpam_component *comp); + 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 ceaf11af4fc1..a2deea1f4818 100644 --- a/drivers/resctrl/mpam_resctrl.c +++ b/drivers/resctrl/mpam_resctrl.c @@ -168,6 +168,19 @@ 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) { @@ -339,6 +352,8 @@ void mpam_resctrl_offline_cpu(unsigned int cpu) =20 ctrl_dom_empty =3D true; if (exposed_alloc_capable) { + mpam_reset_component_locked(dom->ctrl_comp); + ctrl_d =3D &dom->resctrl_ctrl_dom; ctrl_dom_empty =3D mpam_resctrl_offline_domain_hdr(cpu, &ctrl_d->hdr); if (ctrl_dom_empty) --=20 2.39.5