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Wed, 03 Dec 2025 02:57:30 -0800 (PST) X-Google-Smtp-Source: AGHT+IGON+DKrGmDx6X8a3rsGfHfj4g/ExqWhm2qZjcJYSHF7dP+N1DiHu+CNc05pq8LHkVjReCR8A== X-Received: by 2002:a05:6a00:2e82:b0:7aa:a2a8:9808 with SMTP id d2e1a72fcca58-7e00dde2240mr1995676b3a.20.1764759449616; Wed, 03 Dec 2025 02:57:29 -0800 (PST) Received: from [10.219.56.177] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7d15fb14876sm19902091b3a.62.2025.12.03.02.57.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 03 Dec 2025 02:57:29 -0800 (PST) Message-ID: <7580dd6f-564b-bb26-8322-5c4a132f6aa6@oss.qualcomm.com> Date: Wed, 3 Dec 2025 16:27:25 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1 Subject: Re: [PATCH v10 3/3] firmware: qcom_scm: Use TASK_IDLE state in wait_for_wq_completion() Content-Language: en-US To: Mukesh Ojha Cc: Bjorn Andersson , Konrad Dybcio , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Unnathi Chalicheemala , Bartosz Golaszewski References: <20251130-multi_waitq_scm-v10-0-5a5f2f05a417@oss.qualcomm.com> <20251130-multi_waitq_scm-v10-3-5a5f2f05a417@oss.qualcomm.com> <20251203083132.lpx63c7oium52sr6@hu-mojha-hyd.qualcomm.com> From: Shivendra Pratap In-Reply-To: <20251203083132.lpx63c7oium52sr6@hu-mojha-hyd.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=JJg2csKb c=1 sm=1 tr=0 ts=6930179b cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=wP3pNCr1ah4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=ADvd1WbFpuWqqkTu3eMA:9 a=QEXdDO2ut3YA:10 a=zc0IvFSfCIW2DFIPzwfm:22 X-Proofpoint-ORIG-GUID: dWxaxQS761kE6FOIpf4Aw8ZIBPuPfpZe X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjAzMDA4NyBTYWx0ZWRfX6Jynv+7HALhx 95WSEE4P+EYAOdNW7LSC3EaacoR2fezeFTLKs1oiLIvHgOftBvvzqKe9iy72uvFH8vvQ8z3xoXG F4Urg6g81XcnxKNz/nd+eEUicl/9OFu+uvGbZoSaf4jKWJBDh2dIZzZHC0Lh5yLm0aFonxorXus lD9fr3aiT2a8NAzud2IvKbKncC9zt1gy8OtNuZ8nFtWW71b90k5xl4zLxy5vOMG00G2HCI/bQ1S 6CSApXdj7lnrhUmDQ9fxN638cS8ApGUhfCnsxXs2mtCOub+gO1cMjlFDnqQOZyXQVbAEPV38abl py84PL13vnYazDToG1DlC5oxfXNZs49bk8pPAdizJHUu1RHzsZusWAbyzuD3pfymJ2TPgHIeDJA Q1fKjoWiPsigCsS457UnVdKVx/QUZw== X-Proofpoint-GUID: dWxaxQS761kE6FOIpf4Aw8ZIBPuPfpZe X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-02_01,2025-11-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 phishscore=0 impostorscore=0 malwarescore=0 priorityscore=1501 adultscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2512030087 On 12/3/2025 2:01 PM, Mukesh Ojha wrote: > On Sun, Nov 30, 2025 at 08:11:04PM +0530, Shivendra Pratap wrote: >> From: Unnathi Chalicheemala >> >> When the kernel issues an SMC (Secure Monitor Call) and the firmware >> requests the kernel to wait, the waiting thread enters an >> uninterruptible (D) state. In case of an extended wait request by the >> firmware, any device suspend request, cannot proceed because of the >> thread stuck in D state. This blocks the device suspend. > > Not only that, it is stuck in D state after holding a mutex, which is > more severe because none of the SMC calls can go through. However, this > has been the case since the day the firmware started supporting waitq > with a single context, which is somewhat acceptable as the firmware does > not allow otherwise. Since, you are adding the multiple waitq context > supported by firmware with your other patches, > > Do you plan to support multiple waitq contexts i.e parallel SCM calls, > in SCM driver as well ? Yes. Parallel SCM can be enabled once this waitq enablement support is in place. thanks, Shivendra