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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3283da048d3sm12020839eec.28.2026.08.26.17.10.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Aug 2026 17:10:22 -0700 (PDT) Message-ID: <996cd400-44e2-4b4a-8286-1235c3248750@redhat.com> Date: Thu, 27 Aug 2026 10:10:13 +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 v9 12/12] arm_mpam: detect and enable MPAM-Fb PCC support To: Andre Przywara , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Catalin Marinas , Will Deacon , "Rafael J . Wysocki" , Len Brown , James Morse , Ben Horgan , Reinette Chatre , Fenghua Yu Cc: Jonathan Cameron , Srivathsa L Rao , Ganapatrao Kulkarni , Trilok Soni , Srinivas Ramana , Niyas Sait , Lee Trager , Ritwick Sharma , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260807105451.3728284-1-andre.przywara@arm.com> <20260807105451.3728284-13-andre.przywara@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260807105451.3728284-13-andre.przywara@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 8/7/26 8:54 PM, Andre Przywara wrote: > The Arm MPAM-Fb specification [1] describes a protocol to access MSC > registers through a firmware interface. This requires a shared memory > region to hold the message, and a mailbox to trigger the access. > For ACPI this is wrapped as a PCC channel, described using existing > ACPI abstractions. > > Add code to parse those PCC table descriptions associated with an MSC, > and store the parsed information in the MSC struct. > There can be multiple PCC channels, and each channel can serve multiple > MSCs, so we need to keep track of the channel usage, using a list and > a refcount. > > This will be used by the MPAM-Fb access wrapper code. > > [1] https://developer.arm.com/documentation/den0144/latest > > Signed-off-by: Andre Przywara > Tested-by: Ritwick Sharma # on Arm AGI CPU > Reviewed-by: Jonathan Cameron > Tested-by: Srivathsa L Rao > --- > drivers/resctrl/mpam_devices.c | 112 +++++++++++++++++++++++++++++++- > drivers/resctrl/mpam_fb.c | 41 ++++++++++++ > drivers/resctrl/mpam_internal.h | 2 + > 3 files changed, 153 insertions(+), 2 deletions(-) > Reviewed-by: Gavin Shan