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Thu, 15 Oct 2026 01:01:05 -0700 (PDT) X-Received: by 2002:ac8:7f52:0:b0:535:1a83:1251 with SMTP id d75a77b69052e-5359fae166amr344294911cf.4.1792051265100; Thu, 15 Oct 2026 01:01:05 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c3eda044aabsm91788766b.57.2026.10.15.01.01.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Oct 2026 01:01:02 -0700 (PDT) Message-ID: <658c4734-35fe-492e-a9b0-4a4d89afd231@oss.qualcomm.com> Date: Thu, 15 Oct 2026 10:01:00 +0200 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 v1 4/4] arm64: dts: qcom: sm8750: Make the ADSP remote heap no-map To: Jianping Li , Bjorn Andersson , Konrad Dybcio Cc: Abel Vesa , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ekansh Gupta , Vinayak Katoch , Alexey Klimov , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, quic_chennak@quicinc.com References: <20261015071511.977-1-jianping.li@oss.qualcomm.com> <20261015071511.977-5-jianping.li@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261015071511.977-5-jianping.li@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=BaVNQbt2 c=1 sm=1 tr=0 ts=6ad08842 cx=c_pps a=JbAStetqSzwMeJznSMzCyw==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=VwQbUJbxAAAA:8 a=KKAkSRfTAAAA:8 a=EUspDBNiAAAA:8 a=CjiZw0He1JKpzbGRn1AA:9 a=QEXdDO2ut3YA:10 a=zZCYzV9kfG8A:10 a=uxP6HrT_eTzRwkO_Te1X:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-GUID: dnVO_i9_aC7u1-2RqPT_3T4ZjIZyWprl X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE1MDAzMSBTYWx0ZWRfX2yRdYOEhI+cm IYueTt7Yrxh9/tgXpmCOJdmynU03C4ucfUqoJXCSfZ660nZcOBKxVhbCsMm78fslNLvq3+wZkUs GjTrMIXcbWfWQQmgGbFcNUhXJ6dHQN+8j4aJ97zJZyzeY1/toJBH8rqGsSZaC8rm0JnxXBcD2X+ fgeTa87jowfLecv0Orqq6NspUwhZMK8HKXuXCqRSdprWq2jJ2i6ZMpkm+vnGuD9YMHJUPnYyNjn nun+d0akpt27QeR9Z2A21T8Se6PQ6KmdtlrrPAC9puKX56IH+LnanYXqx0bydNIZLLZOqwyvtGA +cAheao/Q0AhDmOGw+jPZiGC4yYOMEhzQXdBHdsWAcKu+8ZESYObHqmjgQeTD6UdApwaDhvM+cd NyZg5HcfSTe/UBsskGnxZQzwm8owrp7+FRIlHk1pt8KIW7XHIRaWYAaE7ocz3mBHr9hY9Yq3HIJ 4oFqXXuid2vwyTVsOPg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE1MDAzMSBTYWx0ZWRfXwhslwxeoso8V jw30nDcYQO25Lfg9FpOnqfues9bnrthd3md0XLhagWZm319rVt8au95THMZHKbebKCsRL9wpHMl CDTnPT7gjFmZDhaIrmZ8S4rRpueXWF0= X-Proofpoint-ORIG-GUID: dnVO_i9_aC7u1-2RqPT_3T4ZjIZyWprl 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=2026-10-13_01,2026-10-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 malwarescore=0 adultscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610150031 On 10/15/26 9:15 AM, Jianping Li wrote: > The ADSP remote heap is declared as a reusable shared DMA pool. > Allowing the kernel to reuse this region is incompatible with handing > the entire region over to the DSP, as HLOS allocations may access > pages for which HLOS no longer has access permissions. > > The same configuration has caused synchronous external aborts on > other platforms when the kernel accesses pages within the ADSP remote > heap. > > Replace reusable with no-map to keep the region reserved for the DSP > and exclude it from the kernel's standard memory mapping. > > Fixes: 0bcf9ca23a873 ("arm64: dts: qcom: sm8750: add memory node for adsp fastrpc") > Link: https://lore.kernel.org/all/20251209-sm8750-fastrpc-adsp-v3-1-ccfff49a8af9@linaro.org/ > Signed-off-by: Jianping Li > --- Reviewed-by: Konrad Dybcio Konrad