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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35bc60ec3aasm10906457a91.10.2026.03.22.23.37.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 22 Mar 2026 23:37:48 -0700 (PDT) Message-ID: <9f5fa983-155e-411a-b543-e7626d6f04b1@redhat.com> Date: Mon, 23 Mar 2026 16:37:34 +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 v6 15/40] arm_mpam: resctrl: Pick the caches we will use as resctrl resources 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> <20260313144617.3420416-16-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260313144617.3420416-16-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 3/14/26 12:45 AM, Ben Horgan wrote: > From: James Morse > > Systems with MPAM support may have a variety of control types at any point > of their system layout. We can only expose certain types of control, and > only if they exist at particular locations. > > Start with the well-known caches. These have to be depth 2 or 3 and support > MPAM's cache portion bitmap controls, with a number of portions fewer than > resctrl's limit. > > Tested-by: Gavin Shan > Tested-by: Shaopeng Tan > Tested-by: Peter Newman > Tested-by: Zeng Heng > Tested-by: Punit Agrawal > Reviewed-by: Zeng Heng > Reviewed-by: Shaopeng Tan > Reviewed-by: Jonathan Cameron > Signed-off-by: James Morse > Signed-off-by: Ben Horgan > --- > Changes since rfc: > Jonathan: > Remove brackets > Compress debug message > Use temp var, r > > Changes since v2: > Return -EINVAL in mpam_resctrl_control_init() for unknown rid > > Changes since v4: > Set alloc_capable after other settings (Reinette) > > Changes since v5: > Missing 'have' in comment > Set cdp_capable to true for L2 and L3 > --- > drivers/resctrl/mpam_resctrl.c | 91 +++++++++++++++++++++++++++++++++- > 1 file changed, 89 insertions(+), 2 deletions(-) > Reviewed-by: Gavin Shan