From nobody Mon Feb 9 19:05:27 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9004831D72D; Fri, 7 Nov 2025 12:38:00 +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=1762519082; cv=none; b=fQdhjzOUjy3scY84yyAE4DDtsB7+pY+Ye6TwpOx3yG231yFPaSpebSuOpHv5iWtYmZYHjlZdIxwUIBia2W+gmcsY86yTJOQhd1WX1Rdq+o10DOzc/fV7369KLQTN7MaWQj0OwK9knc0RK2tcblP/kVXQ19ogd2EbCosfhR7TVgs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762519082; c=relaxed/simple; bh=Pj+JPbxr/eLJokxcYxBg38CmijHeF3gET9C9ICevQQU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iTx0McaF/5/ljQ0MaE1EjwurPgG0ZxUX9w2Y/MqVFshMJVfPJESyO2aXf+U4ghKsotdWEaUA/CEDE0eM2GvwqbAQAUZU6BKv9RrCx2n8DZvMyMnB2Mj5ZrncGp1h9EDunQj36O88Zz8C1JxWgJSpTvO3+ZiJbtHyDRZBRlwUS74= 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 4BB3B1515; Fri, 7 Nov 2025 04:37:52 -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 1C0413F66E; Fri, 7 Nov 2025 04:37:54 -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 Subject: [PATCH 29/33] arm_mpam: Probe for long/lwd mbwu counters Date: Fri, 7 Nov 2025 12:34:46 +0000 Message-ID: <20251107123450.664001-30-ben.horgan@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251107123450.664001-1-ben.horgan@arm.com> References: <20251107123450.664001-1-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: 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 Tested-by: Fenghua Yu Tested-by: Shaopeng Tan Tested-by: Peter Newman Signed-off-by: Ben Horgan Reviewed-by: Gavin Shan --- Changes since v3: Only set the exact counter length that is supported --- drivers/resctrl/mpam_devices.c | 34 +++++++++++++++++++++------------ drivers/resctrl/mpam_internal.h | 3 +++ 2 files changed, 25 insertions(+), 12 deletions(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index eea082dfcddc..e93f2e919a85 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -783,25 +783,35 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ri= s) dev_err_once(dev, "Counters are not usable because not-ready timeout w= as 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 =3D mpam_read_partsel_reg(msc, MBWUMON_IDR); =20 props->num_mbwu_mon =3D FIELD_GET(MPAMF_MBWUMON_IDR_NUM_MON, mbwumon_id= r); - if (props->num_mbwu_mon) + if (props->num_mbwu_mon) { mpam_set_feature(mpam_feat_msmon_mbwu, props); =20 - 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); =20 - /* Is NRDY hardware managed? */ - hw_managed =3D mpam_ris_hw_probe_hw_nrdy(ris, MBWU); - if (hw_managed) - mpam_set_feature(mpam_feat_msmon_mbwu_hw_nrdy, props); + has_long =3D 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); =20 - /* - * Don't warn about any missing firmware property for - * MBWU NRDY - it doesn't make any sense! - */ + /* Is NRDY hardware managed? */ + hw_managed =3D 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! + */ + } } } =20 diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_interna= l.h index 7c99d4f3dc9c..f3bf26b7fdaf 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -162,6 +162,9 @@ 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, --=20 2.43.0