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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29651c740b5sm125699615ad.70.2025.11.09.15.01.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 09 Nov 2025 15:01:25 -0800 (PST) Message-ID: <9c744ab8-d555-4202-905f-015a13c377da@redhat.com> Date: Mon, 10 Nov 2025 09:01:12 +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 24/33] arm_mpam: Probe and reset the rest of the features 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, Zeng Heng , Shaopeng Tan References: <20251107123450.664001-1-ben.horgan@arm.com> <20251107123450.664001-25-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20251107123450.664001-25-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 > > MPAM supports more features than are going to be exposed to resctrl. > For partid other than 0, the reset values of these controls isn't > known. > > Discover the rest of the features so they can be reset to avoid any > side effects when resctrl is in use. > > PARTID narrowing allows MSC/RIS to support less configuration space than > is usable. If this feature is found on a class of device we are likely > to use, then reduce the partid_max to make it usable. This allows us > to map a PARTID to itself. > > CC: Rohit Mathew > CC: Zeng Heng > CC: Dave Martin > Signed-off-by: James Morse > Reviewed-by: Jonathan Cameron > Tested-by: Fenghua Yu > Tested-by: Shaopeng Tan > Tested-by: Peter Newman > Signed-off-by: Ben Horgan > --- > Changes since v3: > enum order and commas > --- > drivers/resctrl/mpam_devices.c | 188 ++++++++++++++++++++++++++++++++ > drivers/resctrl/mpam_internal.h | 18 +++ > 2 files changed, 206 insertions(+) > Reviewed-by: Gavin Shan