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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82b03be2589sm10542710b3a.24.2026.03.23.21.20.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Mar 2026 21:20:27 -0700 (PDT) Message-ID: Date: Tue, 24 Mar 2026 14:20:12 +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 v6 38/40] arm_mpam: Add workaround for T241-MPAM-6 To: Ben Horgan Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, carl@os.amperecomputing.com, dave.martin@arm.com, david@kernel.org, dfustini@baylibre.com, fenghuay@nvidia.com, james.morse@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, peternewman@google.com, punit.agrawal@oss.qualcomm.com, quic_jiles@quicinc.com, reinette.chatre@intel.com, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, tan.shaopeng@fujitsu.com, xhao@linux.alibaba.com, catalin.marinas@arm.com, will@kernel.org, corbet@lwn.net, maz@kernel.org, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, kvmarm@lists.linux.dev, zengheng4@huawei.com, linux-doc@vger.kernel.org, Shaopeng Tan References: <20260313144617.3420416-1-ben.horgan@arm.com> <20260313144617.3420416-39-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260313144617.3420416-39-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 3/14/26 12:46 AM, Ben Horgan wrote: > From: Shanker Donthineni > > The registers MSMON_MBWU_L and MSMON_MBWU return the number of requests > rather than the number of bytes transferred. > > Bandwidth resource monitoring is performed at the last level cache, where > each request arrive in 64Byte granularity. The current implementation > returns the number of transactions received at the last level cache but > does not provide the value in bytes. Scaling by 64 gives an accurate byte > count to match the MPAM specification for the MSMON_MBWU and MSMON_MBWU_L > registers. This patch fixes the issue by reporting the actual number of > bytes instead of the number of transactions from __ris_msmon_read(). > > Tested-by: Gavin Shan > Tested-by: Shaopeng Tan > Reviewed-by: Zeng Heng > Reviewed-by: Shaopeng Tan > Signed-off-by: Shanker Donthineni > Signed-off-by: James Morse > Signed-off-by: Ben Horgan > --- > Changes since rfc: > MPAM_IIDR_NVIDIA_T421 -> MPAM_IIDR_NVIDIA_T241 > Don't apply workaround to MSMON_MBWU_LWD > --- > Documentation/arch/arm64/silicon-errata.rst | 2 ++ > drivers/resctrl/mpam_devices.c | 26 +++++++++++++++++++-- > drivers/resctrl/mpam_internal.h | 1 + > 3 files changed, 27 insertions(+), 2 deletions(-) > Reviewed-by: Gavin Shan