From nobody Tue Dec 16 14:57:45 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C802E2D8764 for ; Fri, 5 Dec 2025 22:00:17 +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=1764972022; cv=none; b=I0sa9Prz0iWhGB5HMqujmNZBi7duaVM5a8lOsHTSiAbKB27NmmdQaiUW5K+QDzLUUWB32KQXNXDPkxvVyy5ikbBT5NXXiN2CoXXvXub/lenpE2X/dAaer6CQuEX6FHN2FKVBl03FkpDgfur8xzQNNie31gB1U1ZcG3N7/GlEpco= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764972022; c=relaxed/simple; bh=QPAl3fcRhJEsk1p8oTbsHIP9oNlT3M3a2ka0zfkvjMI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=KLGOv6Ze/qQrLJz/Enh0YQft8IOlcowk56SNPvpHxW8cD2maV6XdmhTITYMUNzIARDuLfLkztDpD6Y/ecx1gP7uvYFj4pPbpvne+ssFHGfaoi9/S9+g/k+y+km6ANbV1q6UswzXGouRs+UBudOtT0R9r8QOq6H41304cfskyxII= 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 A038D1AED; Fri, 5 Dec 2025 14:00:09 -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 2DCCB3F740; Fri, 5 Dec 2025 14:00:13 -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 12/38] arm_mpam: resctrl: Add plumbing against arm64 task and cpu hooks Date: Fri, 5 Dec 2025 21:58:35 +0000 Message-Id: <20251205215901.17772-13-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" arm64 provides helpers for changing a tasks and a cpus mpam partid/pmg values. These are used to back a number of resctrl_arch_ functions. Connect them up. Signed-off-by: James Morse --- 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 ae0d17857b78..c2650abb99ec 100644 --- a/drivers/resctrl/mpam_resctrl.c +++ b/drivers/resctrl/mpam_resctrl.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -32,6 +33,8 @@ 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; @@ -52,6 +55,61 @@ 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 2.39.5