From nobody Sun Feb 8 15:57:58 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A01DD33B950; Fri, 17 Oct 2025 18:59:04 +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=1760727546; cv=none; b=UxzXjUgc4ooCno5ufelzsxq5W9QiYSGSUNaZJLaqOw/XD/sbYmvQBg89SAc6bR1p8VLPj/vP+4S1vG4nSmAa/CCtN+ZTtwsnohPRraZfFOE3fZyxO/20lv2XpkHjDNm8wLmGL2Alh5ySbax7R1MdJVMU5zfs8YOr4K4g6EjnX6c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760727546; c=relaxed/simple; bh=iW/zivsHRw10NCZUqinUGT4Q4Hu/R9K01q1DJOsmBl8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=G1ACQK9ajwvpOLHtBQFTmfhuiWZUHz65d1Zr6380XCpnHqQw9gvgKdjO1Z8GBWcD6S2ovWP/JhAAoivnH5QlLbF8mzsVwkBIz7CG5stHyJGbP72gpLjWo5gYh9y6QKAk7KJeOaXw+NsbtZRTwdNHXH7DR9J9dqab+uCmriXACpw= 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 112FA1595; Fri, 17 Oct 2025 11:58:56 -0700 (PDT) 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 D7E103F66E; Fri, 17 Oct 2025 11:58:58 -0700 (PDT) From: James Morse To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.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 , Rob Herring , Rohit Mathew , Rafael Wysocki , Len Brown , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich , Jeremy Linton , Gavin Shan , Ben Horgan Subject: [PATCH v3 22/29] arm_mpam: Add helpers to allocate monitors Date: Fri, 17 Oct 2025 18:56:38 +0000 Message-Id: <20251017185645.26604-23-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20251017185645.26604-1-james.morse@arm.com> References: <20251017185645.26604-1-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" MPAM's MSC support a number of monitors, each of which supports bandwidth counters, or cache-storage-utilisation counters. To use a counter, a monitor needs to be configured. Add helpers to allocate and free CSU or MBWU monitors. Signed-off-by: James Morse Reviewed-by: Ben Horgan Reviewed-by: Jonathan Cameron Tested-by: Fenghua Yu --- Changes since v2: * Use ida_alloc_max() instead of ida_alloc_range(). --- drivers/resctrl/mpam_devices.c | 2 ++ drivers/resctrl/mpam_internal.h | 35 +++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index 19cc87aba51a..a29f97cd176a 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -350,6 +350,8 @@ mpam_class_alloc(u8 level_idx, enum mpam_class_types ty= pe) class->level =3D level_idx; class->type =3D type; INIT_LIST_HEAD_RCU(&class->classes_list); + ida_init(&class->ida_csu_mon); + ida_init(&class->ida_mbwu_mon); =20 list_add_rcu(&class->classes_list, &mpam_classes); =20 diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_interna= l.h index 00edee9ebc6c..96a02ea95583 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -197,6 +197,9 @@ struct mpam_class { /* member of mpam_classes */ struct list_head classes_list; =20 + struct ida ida_csu_mon; + struct ida ida_mbwu_mon; + struct mpam_garbage garbage; }; =20 @@ -275,6 +278,38 @@ struct mpam_msc_ris { struct mpam_garbage garbage; }; =20 +static inline int mpam_alloc_csu_mon(struct mpam_class *class) +{ + struct mpam_props *cprops =3D &class->props; + + if (!mpam_has_feature(mpam_feat_msmon_csu, cprops)) + return -EOPNOTSUPP; + + return ida_alloc_max(&class->ida_csu_mon, cprops->num_csu_mon - 1, + GFP_KERNEL); +} + +static inline void mpam_free_csu_mon(struct mpam_class *class, int csu_mon) +{ + ida_free(&class->ida_csu_mon, csu_mon); +} + +static inline int mpam_alloc_mbwu_mon(struct mpam_class *class) +{ + struct mpam_props *cprops =3D &class->props; + + if (!mpam_has_feature(mpam_feat_msmon_mbwu, cprops)) + return -EOPNOTSUPP; + + return ida_alloc_max(&class->ida_mbwu_mon, cprops->num_mbwu_mon - 1, + GFP_KERNEL); +} + +static inline void mpam_free_mbwu_mon(struct mpam_class *class, int mbwu_m= on) +{ + ida_free(&class->ida_mbwu_mon, mbwu_mon); +} + /* List of all classes - protected by srcu*/ extern struct srcu_struct mpam_srcu; extern struct list_head mpam_classes; --=20 2.39.5