From nobody Tue Dec 2 02:59:10 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 307C7337690; Mon, 17 Nov 2025 17:02:46 +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=1763398967; cv=none; b=M03QGomZcq/SFL7zoAt+Z5CGG0eKCeseQFabYpKUFuHt/nU+Y3hKvosK+u+xlNmKrE36UL+SK2nTRGYyhqJxtL8Iq3bPxi0735Lhx1y2bl8BECInkDIWlbFEo0HrYrM/jqFaoADwmtr9oVtPfDfZwSD8P8RnuilfdhSAoNwtVuw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763398967; c=relaxed/simple; bh=Hl2nro4pZDwOOS0oY1a0//CdQYSpl6iBTUFodILpq+I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cZrPUtUBTH/Zw29yY+TCGyRwdbPa7wJV4HJ5V4Ml51PobziH6gLCDkTnVGVLvPLnfoa07kMgb9cQSj5ZKNiKP3j0IDwIf3jSFL1CuVqm2/nTPc97do0Ss1AOln4GDiDILm2pU+B6zqCckmLwuG7hmKsFfsyA6w/WBErJCuaaUGI= 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 04FEBFEC; Mon, 17 Nov 2025 09:02:38 -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 564403F66E; Mon, 17 Nov 2025 09:02:40 -0800 (PST) From: Ben Horgan To: james.morse@arm.com Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, bobo.shaobowang@huawei.com, carl@os.amperecomputing.com, catalin.marinas@arm.com, dakr@kernel.org, dave.martin@arm.com, david@redhat.com, dfustini@baylibre.com, fenghuay@nvidia.com, gregkh@linuxfoundation.org, gshan@redhat.com, guohanjun@huawei.com, jeremy.linton@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, lpieralisi@kernel.org, peternewman@google.com, quic_jiles@quicinc.com, rafael@kernel.org, robh@kernel.org, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, sudeep.holla@arm.com, tan.shaopeng@fujitsu.com, will@kernel.org, xhao@linux.alibaba.com, Ben Horgan , Shaopeng Tan , Zeng Heng Subject: [PATCH v5 25/34] arm_mpam: Add helpers to allocate monitors Date: Mon, 17 Nov 2025 17:00:04 +0000 Message-ID: <20251117170014.4113754-26-ben.horgan@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251117170014.4113754-1-ben.horgan@arm.com> References: <20251117170014.4113754-1-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 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 Reviewed-by: Gavin Shan Reviewed-by: Shaopeng Tan Tested-by: Fenghua Yu Tested-by: Shaopeng Tan Tested-by: Peter Newman Tested-by: Carl Worth Tested-by: Gavin Shan Tested-by: Zeng Heng Signed-off-by: Ben Horgan Reviewed-by: Fenghua Yu --- 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 fe51ede1a1a6..d2d12a94a071 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -305,6 +305,8 @@ 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 b947f30fbf14..e59c0f4d9ada 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -198,6 +198,9 @@ 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 @@ -277,6 +280,38 @@ 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 2.43.0