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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-341a699d6dfsm15532033a91.16.2025.11.09.13.59.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 09 Nov 2025 13:59:46 -0800 (PST) Message-ID: Date: Mon, 10 Nov 2025 07:59:33 +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 17/33] arm_mpam: Merge supported features during mpam_enable() into mpam_class 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> <20251107123450.664001-18-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20251107123450.664001-18-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: James Morse > > To make a decision about whether to expose an mpam class as > a resctrl resource we need to know its overall supported > features and properties. > > Once we've probed all the resources, we can walk the tree > and produce overall values by merging the bitmaps. This > eliminates features that are only supported by some MSC > that make up a component or class. > > If bitmap properties are mismatched within a component we > cannot support the mismatched feature. > > Care has to be taken as vMSC may hold mismatched RIS. > > Signed-off-by: James Morse > Reviewed-by: Ben Horgan > Reviewed-by: Jonathan Cameron > Reviewed-by: Fenghua Yu > Tested-by: Fenghua Yu > Tested-by: Shaopeng Tan > Tested-by: Peter Newman > Signed-off-by: Ben Horgan > --- > drivers/resctrl/mpam_devices.c | 214 ++++++++++++++++++++++++++++++++ > drivers/resctrl/mpam_internal.h | 3 + > 2 files changed, 217 insertions(+) > Reviewed-by: Gavin Shan