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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b2749794e8sm24051245ad.53.2026.04.02.02.41.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 02 Apr 2026 02:41:35 -0700 (PDT) Message-ID: Date: Thu, 2 Apr 2026 17:41:11 +0800 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] arm64: dts: qcom: kodiak: increase fastrpc compute-cb session slots To: Dmitry Baryshkov References: <20260401073345.478-1-jianping.li@oss.qualcomm.com> Content-Language: en-US Cc: Bjorn Andersson , konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Ekansh Gupta From: Jianping Li In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDA4NiBTYWx0ZWRfXwvztrWy8gJS7 ZRhpTs5fiwx3M7aJnMBFQMZuueRZp38loxkWE7J67KrjdkljKW+7bLMmN0pZ+bFAxlvp5G+Xwip lgwnUXHRv3v5JhMPardcQ4bjtDQa4R6fJ6bJECbsYvT1+VeUrXtYeQcHF4Zs3ejXm9zKzHTgSR3 7dvHwRq+Ps6cvimVAxo/F02VHOUI/rkn7lI6dYAjUVYrPnuiUkEiVFPKIkYxkFxNkOPAPT+RB5O AMydeEJAQoBXk3179b8QdT2QfafFGUFiWnR0W2HDFBZp+tEN/FRe4MWKyfKWzkPAyxoVxlwZrGM hFhoYdIuO0m+LaQZ11jHe7NPmDT+XTJ2+2OwgYqmumZpJ7ScI0eJTnpMVlsw5pH1vi/XszUD7CP XaDR2WT6TBVKnASEmB1Xx7C6Qmy3c4M9TBnw3DjR47++QYY9JYatAd7+4AjnCyEEV+yj2X79iI1 b2ZW1gRwqlupRoQeYxA== X-Authority-Analysis: v=2.4 cv=DJSCIiNb c=1 sm=1 tr=0 ts=69ce39d2 cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=CY3x0PKZXqireWAYPuEA:9 a=QEXdDO2ut3YA:10 a=324X-CrmTo6CU4MGRt3R:22 X-Proofpoint-ORIG-GUID: K4acKlf12D3wRMSHVbGaaytbdAiCMe92 X-Proofpoint-GUID: K4acKlf12D3wRMSHVbGaaytbdAiCMe92 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-02_01,2026-04-02_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 bulkscore=0 clxscore=1015 malwarescore=0 adultscore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604020086 On 4/1/2026 7:33 PM, Dmitry Baryshkov wrote: > On Wed, Apr 01, 2026 at 03:33:45PM +0800, Jianping Li wrote: >> Some workloads on Kodiak can exhaust FastRPC sessions when multiple >> compute clients open contexts concurrently, leading to -EBUSY failures. >> >> Describe the compute context bank with qcom,nsessions = <5> so the >> driver can provision enough session slots for the compute-cb instance. > This is a software property, so it probably should not have been added > to the DT in the first place. Can we replace it with the driver code, > allocating more sessions to the last CB? Thank you for your suggestion. I will check the methods you mentioned. Thanks, Jianping. > >> Signed-off-by: Jianping Li >> --- >> arch/arm64/boot/dts/qcom/kodiak.dtsi | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/arch/arm64/boot/dts/qcom/kodiak.dtsi b/arch/arm64/boot/dts/qcom/kodiak.dtsi >> index 6079e67ea829..5bd20909f9db 100644 >> --- a/arch/arm64/boot/dts/qcom/kodiak.dtsi >> +++ b/arch/arm64/boot/dts/qcom/kodiak.dtsi >> @@ -4465,6 +4465,7 @@ compute-cb@5 { >> compatible = "qcom,fastrpc-compute-cb"; >> reg = <5>; >> iommus = <&apps_smmu 0x1805 0x0>; >> + qcom,nsessions = <5>; >> dma-coherent; >> }; >> }; >> -- >> 2.43.0 >>