From nobody Mon Feb 9 20:09:42 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 1560C34D3A4 for ; Fri, 19 Dec 2025 18:13:30 +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=1766168015; cv=none; b=cIM8N3DAE1sGcUi+z96Npn83Dx3D0n0u+1P0WVmSGJM0R/6tHQa5Z1bW6DM1zK7j5+3aRmuJMYslVuZKgId1PQvO7j0K3Q85omxGOKNM5LmFDw08cBWTKaSVDNNp4k7gT6NB1/qbSpDM5H2jazVO7oz+4Bq+8S1Od8yvjprFvoI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766168015; c=relaxed/simple; bh=Ac9BYvks89YP96N4cOnSi1thxduxidBRmV+J7HI4O0g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kPJ9faZyFKmtuX8QLWIDnvRET42Me8q+ykFiZJYbbzJ962gw1CWZlOiil6uxpmp6L6yRypQ5cyRC9U1yeBoVX9ghBduNqPI/PD4zG/p6AleIUQwuLyxo195OT0pVg6Q+OZVu8p3cHteVfy63qT28T1qn2Xz+/LkZOQMJQfzoNV4= 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 0D146FEC; Fri, 19 Dec 2025 10:13:21 -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 B1EEE3F5CA; Fri, 19 Dec 2025 10:13:23 -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 Subject: [PATCH v2 18/45] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() Date: Fri, 19 Dec 2025 18:11:20 +0000 Message-ID: <20251219181147.3404071-19-ben.horgan@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251219181147.3404071-1-ben.horgan@arm.com> References: <20251219181147.3404071-1-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. Signed-off-by: James Morse Signed-off-by: Ben Horgan --- 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 303aacfcb9d6..4f5d908d02a9 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -2544,7 +2544,7 @@ 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 @@ -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 @@ -2580,7 +2580,7 @@ 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 554e4887ba81..b9a739abb101 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -389,6 +389,13 @@ 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 bc4f1c80eab5..d32e87002457 100644 --- a/drivers/resctrl/mpam_resctrl.c +++ b/drivers/resctrl/mpam_resctrl.c @@ -167,6 +167,19 @@ 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) { @@ -353,6 +366,8 @@ 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 2.43.0