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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35c02bf1585sm62840a91.13.2026.03.23.15.50.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Mar 2026 15:50:27 -0700 (PDT) Message-ID: <1385eb20-4b04-453b-ad4a-9bad110f30da@redhat.com> Date: Tue, 24 Mar 2026 08:50:11 +1000 Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 23/40] arm_mpam: resctrl: Add rmid index helpers 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> <20260313144617.3420416-24-ben.horgan@arm.com> From: Gavin Shan In-Reply-To: <20260313144617.3420416-24-ben.horgan@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: ZWk-dY83NYJIC4LEZKq3q4eqaTbBAGflV2YHPOP32DA_1774306229 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 3/14/26 12:46 AM, Ben Horgan wrote: > Because MPAM's pmg aren't identical to RDT's rmid, resctrl handles some > data structures by index. This allows x86 to map indexes to RMID, and MPAM > to map them to partid-and-pmg. > > Add the helpers to do this. > > 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 > Suggested-by: James Morse > Reviewed-by: Jonathan Cameron > Signed-off-by: Ben Horgan > --- > Changes since rfc: > Use ~0U instead of ~0 in lhs of left shift > > Changes since v2: > Drop changes signed-off-by as reworked patch > Use multiply and add rather than shift to avoid holes > --- > drivers/resctrl/mpam_resctrl.c | 16 ++++++++++++++++ > include/linux/arm_mpam.h | 3 +++ > 2 files changed, 19 insertions(+) > Reviewed-by: Gavin Shan