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Thu, 15 Oct 2026 21:49:41 -0700 (PDT) X-Received: by 2002:a05:7301:d193:b0:358:cddd:5ba8 with SMTP id 5a478bee46e88-358cddd5c1bmr25526126eec.13.1792126180897; Thu, 15 Oct 2026 21:49:40 -0700 (PDT) Received: from [10.219.56.188] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-360813b6ca5sm2837094eec.9.2026.10.15.21.49.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Oct 2026 21:49:40 -0700 (PDT) Message-ID: Date: Fri, 16 Oct 2026 10:19:34 +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 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 , 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: Ekansh Gupta In-Reply-To: <20261015071511.977-5-jianping.li@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: T6V3PBkzyK_16_aW4JOYNVYqh4tv01Po X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE2MDAxOCBTYWx0ZWRfX6sOkdlNuuD9T DIf+skS3Jih4yV10laHb1S58jCWIO6T+k6p3x3yepdqpt6JfWerhgUNLA1YhcMPsaVvoF6XjcKi JstMgAyJm57cxiN03a6BybYYLYXc5lgg/OMnWmBgMCTza4leF0dfui5exY/nRRC/U48fzGwDOCo NiDHuxkqs/rDKad+kKdPmEBQWnOLmjbhfMdhAANerqynus2TRJBVpr1AOZfyeRt1ZFIfrOjGpSn sm/8g3qfe3gUkKc/OC4ne5ugcSpg4JFJyZDr6WybTNlbCYFOtdgrrvqfUGQdF77prwf+kJuVjhn fK0XBTdrcDUsACUQjSr/HFEOH+bcXbaEmpEZTTuHDIdiZVDpLBAQyXe09zFW/9HC8dJCc6JNh04 9UZUa28RKBJBOWe/9p5p1Ljx/+FKI3vIuhrl3L88abqerrCVZAAdN8Vn3gA8N7Qi8Kkm1GwE37q Tj2C1SKXEzuM7v9/xGg== X-Proofpoint-GUID: T6V3PBkzyK_16_aW4JOYNVYqh4tv01Po X-Authority-Analysis: v=2.4 cv=R5qWitRX c=1 sm=1 tr=0 ts=6ad1ace6 cx=c_pps a=wEP8DlPgTf/vqF+yE6f9lg==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=VwQbUJbxAAAA:8 a=KKAkSRfTAAAA:8 a=EUspDBNiAAAA:8 a=WxrJ1OjRqBU2I1o4brwA:9 a=QEXdDO2ut3YA:10 a=zZCYzV9kfG8A:10 a=bBxd6f-gb0O0v-kibOvt:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE2MDAxOCBTYWx0ZWRfX55dBll4Ax4vy HurDQHGrF/nkVS7/LOPnD5OR6SJWC2zd8GBZqyjeklEgU7QIlSjnz1hb5aS4sWs+Ey3YO4yj42G Ij0rW+VpyQrHS7mpRL4UxmdIT38o1Mw= 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=2026-10-14_01,2026-10-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 impostorscore=0 suspectscore=0 phishscore=0 adultscore=0 malwarescore=0 clxscore=1015 bulkscore=0 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610160018 On 15-10-2026 12:45, 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: Ekansh Gupta