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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-829a48d3871sm9235407b3a.60.2026.03.08.23.43.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 08 Mar 2026 23:43:37 -0700 (PDT) Message-ID: <57dbec80-4cfe-468e-b32d-7dc0f872ed67@redhat.com> Date: Mon, 9 Mar 2026 16:43:19 +1000 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 07/41] arm64: mpam: Advertise the CPUs MPAM limits to the driver 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: <20260224175720.2663924-1-ben.horgan@arm.com> <20260224175720.2663924-8-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260224175720.2663924-8-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/25/26 3:56 AM, Ben Horgan wrote: > From: James Morse > > Requestors need to populate the MPAM fields for any traffic they send on > the interconnect. For the CPUs these values are taken from the > corresponding MPAMy_ELx register. Each requestor may have a limit on the > largest PARTID or PMG value that can be used. The MPAM driver has to > determine the system-wide minimum supported PARTID and PMG values. > > To do this, the driver needs to be told what each requestor's limit is. > > CPUs are special, but this infrastructure is also needed for the SMMU and > GIC ITS. Call the helper to tell the MPAM driver what the CPUs can do. > > The return value can be ignored by the arch code as it runs well before the > MPAM driver starts probing. > > Tested-by: Gavin Shan > Tested-by: Shaopeng Tan > Tested-by: Peter Newman > Tested-by: Zeng Heng > Reviewed-by: Shaopeng Tan > Reviewed-by: Jonathan Cameron > Reviewed-by: Catalin Marinas > Signed-off-by: James Morse > Signed-off-by: Ben Horgan > --- > arch/arm64/kernel/mpam.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > Reviewed-by: Gavin Shan