From nobody Mon Feb 9 20:11:19 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0D0AA23741 for ; Mon, 12 Jan 2026 17:01:40 +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=1768237303; cv=none; b=J3gxCCWCRmA4qEoBAqpTw/zwXoIzE+nMDX/WOuLQFpb3DR/y0MZzAzPutb3IirG8gldRcy7clgZVzhbWY/1SoQE71g2FQi0DJruaJNxyzeK7RvNkE9ZumIiuLIP51ADt7rs7xPZC6bMHsqJ4FeCB0L5sy7NOrnZ0qdR4swquCK4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768237303; c=relaxed/simple; bh=ffRX0nWQ9WEKYUXjHgyEuUAq8oZ60ss2M3HMk+SEVqw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=I4SHKJKAjWc2XMo0UXwWWkkLeCHVTL5tNepVIxVh09iGTSRYbowvSIpyQJ7mqvc+YKIrOLBcO6mbBBemohn3T9zNT4tAVVNXOkDLzZ+o9cIhxziMDt/ggamGyC45+Yr7fEdUC3Qw0kK9O0jESWKn6AE0ojm9uDFaUwn9JCShhZk= 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 1C90F153B; Mon, 12 Jan 2026 09:01:33 -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 B1A5B3F694; Mon, 12 Jan 2026 09:01:34 -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 v3 20/47] arm_mpam: resctrl: Add plumbing against arm64 task and cpu hooks Date: Mon, 12 Jan 2026 16:58:47 +0000 Message-ID: <20260112165914.4086692-21-ben.horgan@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260112165914.4086692-1-ben.horgan@arm.com> References: <20260112165914.4086692-1-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 arm64 provides helpers for changing a task's and a cpu's mpam partid/pmg values. These are used to back a number of resctrl_arch_ functions. Connect them up. Reviewed-by: Jonathan Cameron Signed-off-by: James Morse Signed-off-by: Ben Horgan --- Changes since v2: apostrophes in commit message --- drivers/resctrl/mpam_resctrl.c | 58 ++++++++++++++++++++++++++++++++++ include/linux/arm_mpam.h | 5 +++ 2 files changed, 63 insertions(+) diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c index 5b73fe45b8fa..c596b224c967 100644 --- a/drivers/resctrl/mpam_resctrl.c +++ b/drivers/resctrl/mpam_resctrl.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -37,6 +38,8 @@ static DEFINE_MUTEX(domain_list_lock); static bool exposed_alloc_capable; static bool exposed_mon_capable; =20 +static bool cdp_enabled; + bool resctrl_arch_alloc_capable(void) { return exposed_alloc_capable; @@ -57,6 +60,61 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *ign= ored) return mpam_partid_max + 1; } =20 +void resctrl_arch_sched_in(struct task_struct *tsk) +{ + lockdep_assert_preemption_disabled(); + + mpam_thread_switch(tsk); +} + +void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 rmi= d) +{ + WARN_ON_ONCE(closid > U16_MAX); + WARN_ON_ONCE(rmid > U8_MAX); + + if (!cdp_enabled) { + mpam_set_cpu_defaults(cpu, closid, closid, rmid, rmid); + } else { + /* + * When CDP is enabled, resctrl halves the closid range and we + * use odd/even partid for one closid. + */ + u32 partid_d =3D resctrl_get_config_index(closid, CDP_DATA); + u32 partid_i =3D resctrl_get_config_index(closid, CDP_CODE); + + mpam_set_cpu_defaults(cpu, partid_d, partid_i, rmid, rmid); + } +} + +void resctrl_arch_sync_cpu_closid_rmid(void *info) +{ + struct resctrl_cpu_defaults *r =3D info; + + lockdep_assert_preemption_disabled(); + + if (r) { + resctrl_arch_set_cpu_default_closid_rmid(smp_processor_id(), + r->closid, r->rmid); + } + + resctrl_arch_sched_in(current); +} + +void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32= rmid) +{ + WARN_ON_ONCE(closid > U16_MAX); + WARN_ON_ONCE(rmid > U8_MAX); + + if (!cdp_enabled) { + mpam_set_task_partid_pmg(tsk, closid, closid, rmid, rmid); + } else { + u32 partid_d =3D resctrl_get_config_index(closid, CDP_DATA); + u32 partid_i =3D resctrl_get_config_index(closid, CDP_CODE); + + mpam_set_task_partid_pmg(tsk, partid_d, partid_i, rmid, rmid); + } +} + struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l) { if (l >=3D RDT_NUM_RESOURCES) diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h index 2c7d1413a401..5a78299ec464 100644 --- a/include/linux/arm_mpam.h +++ b/include/linux/arm_mpam.h @@ -52,6 +52,11 @@ static inline int mpam_ris_create(struct mpam_msc *msc, = u8 ris_idx, bool resctrl_arch_alloc_capable(void); bool resctrl_arch_mon_capable(void); =20 +void resctrl_arch_set_cpu_default_closid(int cpu, u32 closid); +void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32= rmid); +void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 rmi= d); +void resctrl_arch_sched_in(struct task_struct *tsk); + /** * mpam_register_requestor() - Register a requestor with the MPAM driver * @partid_max: The maximum PARTID value the requestor can generate. --=20 2.43.0