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Fri, 31 Jul 2026 04:56:34 -0700 (PDT) X-Received: by 2002:ac8:7e81:0:b0:51c:1c73:51a6 with SMTP id d75a77b69052e-52b4b12c2famr20189521cf.5.1785498994273; Fri, 31 Jul 2026 04:56:34 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1fd4537702sm123113566b.53.2026.07.31.04.56.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 31 Jul 2026 04:56:33 -0700 (PDT) Message-ID: <36a7bd8e-7e00-4df0-abd4-e22b86e91ca4@oss.qualcomm.com> Date: Fri, 31 Jul 2026 13:56:31 +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 3/3] watchdog: qcom: Register pretimeout interrupt as NMI To: mrungta@google.com, Wim Van Sebroeck , Guenter Roeck , Thomas Gleixner Cc: linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, "Kirill A. Shutemov" , Douglas Anderson References: <20260730-qcom-wdt-nmi-series-v1-0-3aa86d162914@google.com> <20260730-qcom-wdt-nmi-series-v1-3-3aa86d162914@google.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260730-qcom-wdt-nmi-series-v1-3-3aa86d162914@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=MNVQXsZl c=1 sm=1 tr=0 ts=6a6c8d73 cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=1XWaLZrsAAAA:8 a=knYzKYFgTjH3_HfYCsAA:9 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzMxMDA5MSBTYWx0ZWRfX1BzH3VHk7ucj +OWqZGw/8btKOxnJQ35Fiq7CcVyYHYjNjAbk8TU8NZTmKcKyBr+tX8IFCFQBvxDBeieAW7E63q8 I7TyjW/+WlybJQGIBaLlkEgBR3cbI8Q= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzMxMDA5MSBTYWx0ZWRfX3SElkJ+wQO7+ Bml5lCdlwljo+ABaVnAQ9nMJOgUwytTCwlGEGXcYOA+PG6wdsg5ZAwqyvb6iYWHgfHsHsMwbysZ i6M9SAHO9XwnqVuBgK0/Pv3W0yLUmqEYf4B3FXiZN8g2GskZcxsTf2VnXRP1+8nkhiOCETTXAAu c6E5oYs5hpCAhIqFIW3j+vUycEGruVs3ykK2yrYZVwshUmTYL3j7m7y+DJxYByU69N46KY7G8TH sHtYdbBX+p2vNoo2X6IQy1kAWsZta0OkTiOHKFrMz6ker0yL7XLre33ATtekq2ImHSz8PnKBumw jPkr5OV/1jZVNLXYchCvGAu28EVYSYxXUsg+T619DtjBLLY9tiR82SmBkHMk63Athyyw5jczXdl 46r7HcqJ6QVKkKn8lNwEoDYkEf9avG1GDe00X0Ab9h7FNmMlvsxnEFvcCLkKsFpHYCTqC4o/Hip ZGbzKSBfHNPa/mhqJYg== X-Proofpoint-GUID: QDWvKmBkX8KG7PeLDqlMts5zxTYigc4u X-Proofpoint-ORIG-GUID: QDWvKmBkX8KG7PeLDqlMts5zxTYigc4u X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-31_04,2026-07-30_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 suspectscore=0 malwarescore=0 clxscore=1015 impostorscore=0 adultscore=0 spamscore=0 phishscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607310091 On 7/30/26 11:32 PM, Mayank Rungta via B4 Relay wrote: > From: Mayank Rungta > > When a system is completely unresponsive due to an interrupt storm or > deadlocked CPU cores with standard interrupts disabled, a standard watchdog > pretimeout bark interrupt will fail to execute, preventing the pretimeout > governor from capturing CPU backtraces before the hardware reset bite. [...] > drivers/watchdog/qcom-wdt.c | 55 +++++++++++++++++++++++++++++++++++++++++---- > 1 file changed, 51 insertions(+), 4 deletions(-) > > diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c > index 49bd04841f0c..19d8e91cff40 100644 > --- a/drivers/watchdog/qcom-wdt.c > +++ b/drivers/watchdog/qcom-wdt.c > @@ -51,6 +51,9 @@ struct qcom_wdt { > unsigned long rate; > void __iomem *base; > const u32 *layout; > + int irq; > + bool is_nmi; > + bool irq_enabled; Do we need to track this? I think we can rely on the framework NOPing out multiple ops->start requests Konrad