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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39645d31e8csm8950241a91.9.2026.08.26.10.43.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Aug 2026 10:43:26 -0700 (PDT) Message-ID: <913fd0bb-6257-48f8-9f04-7df3d44c201e@oss.qualcomm.com> Date: Wed, 26 Aug 2026 23:13:18 +0530 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 , Ganapatrao Kulkarni , Trilok Soni , Srinivas Ramana , Niyas Sait , Lee Trager , Ritwick Sharma , Gavin Shan , 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: Srivathsa L Rao In-Reply-To: <20260807105451.3728284-13-andre.przywara@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=EMA2FVZC c=1 sm=1 tr=0 ts=6a8f25c1 cx=c_pps a=vVfyC5vLCtgYJKYeQD43oA==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=7CQSdrXTAAAA:8 a=EUspDBNiAAAA:8 a=3NjWhugmwSPu7QgOpREA:9 a=QEXdDO2ut3YA:10 a=rl5im9kqc5Lf4LNbBjHf:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-ORIG-GUID: uj0cu0vhV0bwdj2I-ZCi_kVFsD9YSrzE X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI2MDE0OCBTYWx0ZWRfX6ITtQsKnAQZm XjO1zlKr/xEHxUF9AYEWw1n/z8JcFSUiJtCSgerYq51yjTbLT/2G9+Ah5FHRuP2//q77v6tnDIH KR8d2wuwqHtTnZRWryJCBkQtHqSMhzQRNGpBrcCDGsHw1hSTYMHxzz97BEx1ywtdE1kKZ0RrV0s 37yPx4B0L919i3lTJbboxTL3e8Jp2+xOqhvjRnzzDcT0HK8ib87/rIqJHbC6WtDaWvbU9knfNui CwNRjFY/xJcUkaEQy9HpT7d6AZmmiHK6BVb4XG+FVNxldCDXI7djGotPiMW/UQ5fmesyNxz/gPc C9Mu1qkp318EXgU56NhQZxMJc6WfJ9H5YvvdRcpFL27IWeZCu6GaCGuZ44UiOxth5mLGXykTIqe nq6CLev+Mwzh1+U69NbNxVxXczP/itoQgIUcVlUs0eNu655eofmpyBlbicjXSUXhtq56Be+7EMo t6AIRF5IMwuR4kSb2Yw== X-Proofpoint-Spam-Info: AW1haW4tMjYwODI2MDE0OCBTYWx0ZWRfX7oRHyqstttl1 YTGj+Sv/K6Euyr0kcUxP5D7AY6srMEiFIic5MvmaxOu1P6nSMkzkqU6q0DbRuKDWlAgwM+0gmAU jU3Iez1ETETZ9lPu2eb/zuK7cetZTAM= X-Proofpoint-GUID: uj0cu0vhV0bwdj2I-ZCi_kVFsD9YSrzE X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-26_05,2026-08-26_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 malwarescore=0 clxscore=1015 phishscore=0 priorityscore=1501 suspectscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608260148 On 8/7/2026 4:24 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(-) > > diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c > index 4b1382fce2be..4d3f13044b43 100644 > --- a/drivers/resctrl/mpam_devices.c > +++ b/drivers/resctrl/mpam_devices.c Reviewed-by: Srivathsa L Rao