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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d70497753csm10214575ad.18.2026.08.26.10.39.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Aug 2026 10:39:36 -0700 (PDT) Message-ID: Date: Wed, 26 Aug 2026 23:09:27 +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 10/12] arm_mpam: add MPAM-Fb MSC firmware access 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> <20260807105451.3728284-11-andre.przywara@arm.com> Content-Language: en-US From: Srivathsa L Rao In-Reply-To: <20260807105451.3728284-11-andre.przywara@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=O/oJeh9W c=1 sm=1 tr=0 ts=6a8f24d9 cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=7CQSdrXTAAAA:8 a=EUspDBNiAAAA:8 a=20KFwNOVAAAA:8 a=y8rQOhXNOWzMl4_LRjcA:9 a=QEXdDO2ut3YA:10 a=324X-CrmTo6CU4MGRt3R:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-GUID: -8QmxvpP_XOJcpn9CDHkuoRXUCCWs1XW X-Proofpoint-ORIG-GUID: -8QmxvpP_XOJcpn9CDHkuoRXUCCWs1XW X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI2MDE0NyBTYWx0ZWRfX958oCw1NpdAg /VoL69KuldaV1jl8dvh/wdwyuqJXlB5AHRxuej2RdSoqKXBSk2E3EfCZ1IjUo8UJ72iqlGhOaFi E4syZ+SF1cEhGlp7cpdsuo6olSgpzusF6NjddDAoKN1TeSZFx3ak6sqgKduMRRCn5ps6pvfuNIx XaJMRv+LDM42s7Ja5qn5gUHVScnUrT5CuWijIvrv0o4Ugw56Xws4bjgbDEgcPcFln9jRj+KKliT V7IuJgodqfi3HGCmZROR8wTwgBQXa6TqMQAIIwDC+5/JBRucvNSfAnnPQVa/zIi+ZssbGjFT0f8 KJlD2ihIMeCBV1zjIYoPqybvs1nfkgPrAigNASqc86HK7LVSNilKK2NosOIc8pW3ls34DsKtmhO f/lI5Ru3/FZcGjFYxsIwYRi6AksW462BoGmOiKSEZ7LKIXM0jEdInnavxqE2Tc7Ss8E1QOYQ6Po GsZUhMSjuxzqnA7MUgA== X-Proofpoint-Spam-Info: AW1haW4tMjYwODI2MDE0NyBTYWx0ZWRfX+22NMGAz5Rg4 ZHkPlbfMTCYfFWqbCPYQ2CLztCQNFs0amuwRD3a454CpZmH5+6vdbsBRDhf9T7GooQVjsnoDE5Q oaMiVamEwEHNYJ26pDEvTC2iY3CK8dc= 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 malwarescore=0 suspectscore=0 spamscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 priorityscore=1501 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608260147 On 8/7/2026 4:24 PM, Andre Przywara wrote: > The Arm MPAM Firmware-backed (Fb) Profile document[1] describes an > alternative way of accessing the "Memory System Components" (MSC) in an > MPAM enabled system. > > Normally the MSCs are MMIO mapped, but in some implementations this > might not be possible (MSC located outside of the local socket, MSC > mapped secure-only) or desirable (direct MMIO access too slow or needs > to be mediated through a control processor). MPAM-fb standardises a > protocol to abstract MSC accesses, building on the SCMI protocol. > > Add functions that do an MSC read or write access by redirecting the > request through a firmware interface. For now this done via an ACPI > PCC shared memory and mailbox combination. > > Since the protocol used is only a small subset of the full SCMI spec, > and the SCMI protocol has no full ACPI support anyway, open-code the > (simple) SCMI message generation, for just the fields we need. > > [1] https://developer.arm.com/documentation/den0144/latest > > Signed-off-by: Andre Przywara > Reviewed-by: Jonathan Cameron > Tested-by: Ritwick Sharma # on Arm AGI CPU > Reviewed-by: Gavin Shan > Tested-by: Srivathsa L Rao > --- > drivers/resctrl/Makefile | 2 +- > drivers/resctrl/mpam_devices.c | 65 ++++++++-- > drivers/resctrl/mpam_fb.c | 211 ++++++++++++++++++++++++++++++++ > drivers/resctrl/mpam_internal.h | 18 +++ > include/linux/arm_mpam.h | 2 +- > 5 files changed, 284 insertions(+), 14 deletions(-) > create mode 100644 drivers/resctrl/mpam_fb.c > > diff --git a/drivers/resctrl/Makefile b/drivers/resctrl/Makefile > index 4f6d0e81f9b8..097c036724e9 100644 > --- a/drivers/resctrl/Makefile > +++ b/drivers/resctrl/Makefile > @@ -1,5 +1,5 @@ Reviewed-by: Srivathsa L Rao