From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id ED0BF34F48B; Fri, 22 Aug 2025 15:36:45 +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=1755877007; cv=none; b=vDiqmyALUJkljvVUJygtlPdgHRnrMyLFj4npZrVHiXp3KJaCCIh3QlinGKuDSpDXwHb0w8wwPBIFROFTwDP02UtOLYxxKDSEs9ghWU0xWy3bm42lgBQ/B0irP4q6CW8emyXYwfsjnMifrPCpLM+QW/bhJbxQA9pUZzYlWrMjZeM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755877007; c=relaxed/simple; bh=P0s70JGbxqI2NTlW01YUNWEsH9cS/kHpixRrL7dj8Qc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=qvKvg4ZXDX+a8TMTATBrmCpd6kgrAn0Za3Rqvhib+DP1xcNHh7K12FR8c5JeaTQZG4IjYwyfhMRSWqkPe7fWxT8jQcMvmbcQx90TbF5+D3Yx7SUmlFWj4tdZ7o2T7+8ylFyv+RHrVCW8jAYDfx0TSDZ5SxRt5d7ROXWPIcNgbpY= 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 3D22015A1; Fri, 22 Aug 2025 08:36:37 -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 163153F63F; Fri, 22 Aug 2025 08:36:39 -0700 (PDT) From: James Morse To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org Cc: James Morse , shameerali.kolothum.thodi@huawei.com, 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 , Rex Nie , 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 , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich Subject: [PATCH 26/33] arm_mpam: Add helpers to allocate monitors Date: Fri, 22 Aug 2025 15:30:41 +0000 Message-Id: <20250822153048.2287-61-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20250822153048.2287-1-james.morse@arm.com> References: <20250822153048.2287-1-james.morse@arm.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- 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 aedd743d6827..e7e00c632512 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -348,6 +348,8 @@ mpam_class_alloc(u8 level_idx, enum mpam_class_types type, gfp_t gfp) class->level = level_idx; class->type = type; INIT_LIST_HEAD_RCU(&class->classes_list); + ida_init(&class->ida_csu_mon); + ida_init(&class->ida_mbwu_mon); list_add_rcu(&class->classes_list, &mpam_classes); diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_internal.h index 23445aedbabd..4981de120869 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -231,6 +231,9 @@ struct mpam_class { /* member of mpam_classes */ struct list_head classes_list; + struct ida ida_csu_mon; + struct ida ida_mbwu_mon; + struct mpam_garbage garbage; }; @@ -306,6 +309,38 @@ struct mpam_msc_ris { struct mpam_garbage garbage; }; +static inline int mpam_alloc_csu_mon(struct mpam_class *class) +{ + struct mpam_props *cprops = &class->props; + + if (!mpam_has_feature(mpam_feat_msmon_csu, cprops)) + return -EOPNOTSUPP; + + return ida_alloc_range(&class->ida_csu_mon, 0, 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 = &class->props; + + if (!mpam_has_feature(mpam_feat_msmon_mbwu, cprops)) + return -EOPNOTSUPP; + + return ida_alloc_range(&class->ida_mbwu_mon, 0, + cprops->num_mbwu_mon - 1, GFP_KERNEL); +} + +static inline void mpam_free_mbwu_mon(struct mpam_class *class, int mbwu_mon) +{ + 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; -- 2.20.1