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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29651cc1833sm123856145ad.97.2025.11.09.15.16.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 09 Nov 2025 15:16:44 -0800 (PST) Message-ID: <3448db42-cc36-4d2c-b6f9-b2ed85bf9227@redhat.com> Date: Mon, 10 Nov 2025 09:16:31 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 29/33] arm_mpam: Probe for long/lwd mbwu counters To: Ben Horgan , 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, 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, Shaopeng Tan References: <20251107123450.664001-1-ben.horgan@arm.com> <20251107123450.664001-30-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20251107123450.664001-30-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/7/25 10:34 PM, Ben Horgan wrote: > 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 > --- > 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(-) > Reviewed-by: Gavin Shan