From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5FC9ACF31B7 for ; Wed, 19 Nov 2025 12:26:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=gDILOQvd1jB1aIM+nXubygcOFrnMF6qBZ8bZEEkUoWs=; b=sosxzVZT/pi1xQZKT45QTj0on7 A2Kk9H2D7wS4jPtIXXZGLWACgH7HTo59m7pPGTOoJ8HYKF7sexoELdAwJwaAe1ZM+tZFUiTkee2tn zn4pxJmRxVwXx179CKpfcPplY3nTjaHYOBh8hBAHzaAAtFhV/6ytXgtHrTtXnw7Mq3Lkz/QUwGaoW LkJVZtx7QQE1gAnUS2n8PjJf/JRxQiask3aIxws2oKzAsTznXfJ0L2KZVXAIJD1tfbUyTDWnjm5TL 5HKi3cQIKD84hYWjJDkMGUx9cqjl1LAQ8dXYOBSTw7XSDsWA782FCzCmthv8TBx7cwki6xjKgvu6v sb5yDLPg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vLhGO-000000038wj-0rGk; Wed, 19 Nov 2025 12:26:20 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vLhGC-000000038lI-3Dz4 for linux-arm-kernel@lists.infradead.org; Wed, 19 Nov 2025 12:26:15 +0000 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 7A17312FC; Wed, 19 Nov 2025 04:26:00 -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 D98023F740; Wed, 19 Nov 2025 04:26:02 -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, reinette.chatre@intel.com, Ben Horgan , Shaopeng Tan , Zeng Heng Subject: [PATCH v6 29/34] arm_mpam: Probe for long/lwd mbwu counters Date: Wed, 19 Nov 2025 12:22:59 +0000 Message-ID: <20251119122305.302149-30-ben.horgan@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251119122305.302149-1-ben.horgan@arm.com> References: <20251119122305.302149-1-ben.horgan@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251119_042608_922001_9388AC0F X-CRM114-Status: GOOD ( 13.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Rohit Mathew mpam v0.1 and versions above v1.0 support optional long counter for memory bandwidth monitoring. The MPAMF_MBWUMON_IDR register has fields indicating support for long counters. Probe these feature bits. The mpam_feat_msmon_mbwu feature is used to indicate that bandwidth monitors are supported, instead of muddling this with which size of bandwidth monitors, add an explicit 31 bit counter feature. Signed-off-by: Rohit Mathew [ morse: Added 31bit counter feature to simplify later logic ] Signed-off-by: James Morse Reviewed-by: Ben Horgan Reviewed-by: Jonathan Cameron Reviewed-by: Gavin Shan Reviewed-by: Shaopeng Tan Reviewed-by: Fenghua Yu Tested-by: Fenghua Yu Tested-by: Shaopeng Tan Tested-by: Peter Newman Tested-by: Carl Worth Tested-by: Gavin Shan Tested-by: Zeng Heng Tested-by: Hanjun Guo Signed-off-by: Ben Horgan --- Changes since v3: Only set the exact counter length that is supported --- drivers/resctrl/mpam_devices.c | 35 ++++++++++++++++++++++----------- drivers/resctrl/mpam_internal.h | 3 +++ 2 files changed, 26 insertions(+), 12 deletions(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index ecb5ecad50f8..380386cceb74 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -783,25 +783,36 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) dev_err_once(dev, "Counters are not usable because not-ready timeout was not provided by firmware."); } if (FIELD_GET(MPAMF_MSMON_IDR_MSMON_MBWU, msmon_features)) { - bool hw_managed; + bool has_long, hw_managed; u32 mbwumon_idr = mpam_read_partsel_reg(msc, MBWUMON_IDR); props->num_mbwu_mon = FIELD_GET(MPAMF_MBWUMON_IDR_NUM_MON, mbwumon_idr); - if (props->num_mbwu_mon) + if (props->num_mbwu_mon) { mpam_set_feature(mpam_feat_msmon_mbwu, props); - if (FIELD_GET(MPAMF_MBWUMON_IDR_HAS_RWBW, mbwumon_idr)) - mpam_set_feature(mpam_feat_msmon_mbwu_rwbw, props); + if (FIELD_GET(MPAMF_MBWUMON_IDR_HAS_RWBW, mbwumon_idr)) + mpam_set_feature(mpam_feat_msmon_mbwu_rwbw, props); - /* Is NRDY hardware managed? */ - hw_managed = mpam_ris_hw_probe_hw_nrdy(ris, MBWU); - if (hw_managed) - mpam_set_feature(mpam_feat_msmon_mbwu_hw_nrdy, props); + has_long = FIELD_GET(MPAMF_MBWUMON_IDR_HAS_LONG, mbwumon_idr); + if (has_long) { + if (FIELD_GET(MPAMF_MBWUMON_IDR_LWD, mbwumon_idr)) + mpam_set_feature(mpam_feat_msmon_mbwu_63counter, props); + else + mpam_set_feature(mpam_feat_msmon_mbwu_44counter, props); + } else { + mpam_set_feature(mpam_feat_msmon_mbwu_31counter, props); + } - /* - * Don't warn about any missing firmware property for - * MBWU NRDY - it doesn't make any sense! - */ + /* Is NRDY hardware managed? */ + hw_managed = mpam_ris_hw_probe_hw_nrdy(ris, MBWU); + if (hw_managed) + mpam_set_feature(mpam_feat_msmon_mbwu_hw_nrdy, props); + + /* + * Don't warn about any missing firmware property for + * MBWU NRDY - it doesn't make any sense! + */ + } } } diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_internal.h index 218e2f48c7bf..693a315c4710 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -164,6 +164,9 @@ enum mpam_device_features { mpam_feat_msmon_csu_xcl, mpam_feat_msmon_csu_hw_nrdy, mpam_feat_msmon_mbwu, + mpam_feat_msmon_mbwu_31counter, + mpam_feat_msmon_mbwu_44counter, + mpam_feat_msmon_mbwu_63counter, mpam_feat_msmon_mbwu_capture, mpam_feat_msmon_mbwu_rwbw, mpam_feat_msmon_mbwu_hw_nrdy, -- 2.43.0