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[79.144.196.152]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45e0156abecsm225260475e9.4.2025.09.16.08.07.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Sep 2025 08:07:03 -0700 (PDT) From: Jorge Ramirez X-Google-Original-From: Jorge Ramirez Date: Tue, 16 Sep 2025 17:07:01 +0200 To: Jorge Ramirez Cc: Praveen Talari , Alexey Klimov , Praveen Talari , Greg Kroah-Hartman , Jiri Slaby , Bryan O'Donoghue , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, psodagud@quicinc.com, djaggi@quicinc.com, quic_msavaliy@quicinc.com, quic_vtanuku@quicinc.com, quic_arandive@quicinc.com, quic_shazhuss@quicinc.com, krzk@kernel.org Subject: Re: [PATCH v1] serial: qcom-geni: Fix pinctrl deadlock on runtime resume Message-ID: References: <20250908164532.2365969-1-praveen.talari@oss.qualcomm.com> <5b7b8c9f-48c5-45cd-8366-c8c048eaa757@oss.qualcomm.com> <2c5fd01a-543b-4108-ac54-80d1d87b65a3@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTEzMDAxOSBTYWx0ZWRfX7iCRUPvFeVF/ eeezGIAIYhGO6CGBmUZ3+ZzrX5KKnXxofaErNka/vFGItm94yFz+liVIh01qQHcFkwqbdvMMY/2 vySWyjQdY5shxZV4wEWw+hKNHjgw++PN0Qf1jHfxgRAmG85lE3EyXySNoogRCi7X4zA+FQ+qTkU m/t6tVJk3BCh79WKy0/tAHsj9EJn9Qtjx8DUhaw3M5lslTc27tHRpt1UBBCeHmuTLEkE0j6N+sQ pNodEJF7DtTf4jAX6gW6vkrU/8ItJA6KuISp6DrJ8o1mAu0+Y8GoPVj58E0ezwPtPg0N+20Mo1/ TdkMt8HgM8Li5BDQH1LoO74IapKprPsgpet6+kSUvRdoC+uUIC3LBqWDG1TqNznryYfIBsi8eG1 OlW4qKZd X-Authority-Analysis: v=2.4 cv=cdTSrmDM c=1 sm=1 tr=0 ts=68c97d1a cx=c_pps a=7E5Bxpl4vBhpaufnMqZlrw==:117 a=UlsMzGb/nx+Jy78HFkoo8g==:17 a=8nJEP1OIZ-IA:10 a=yJojWOMRYYMA:10 a=COk6AnOGAAAA:8 a=EUspDBNiAAAA:8 a=KKAkSRfTAAAA:8 a=o8Ad3ZvNeqkkIsAbXqoA:9 a=3ZKOabzyN94A:10 a=wPNLvfGTeEIA:10 a=pJ04lnu7RYOZP9TFuWaZ:22 a=TjNXssC_j7lpFel5tvFf:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-ORIG-GUID: jh40nGXZF1mJTnSfAB6UOliTjPdnJGTN X-Proofpoint-GUID: jh40nGXZF1mJTnSfAB6UOliTjPdnJGTN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-16_02,2025-09-12_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 priorityscore=1501 adultscore=0 suspectscore=0 bulkscore=0 impostorscore=0 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2509130019 On 16/09/25 16:39:00, Jorge Ramirez wrote: > On 16/09/25 12:20:25, Praveen Talari wrote: > > Hi Alexey > > > > Thank you for your support. > > > > On 9/15/2025 7:55 PM, Praveen Talari wrote: > > > Hi Alexey, > > > > > > On 9/15/2025 3:09 PM, Alexey Klimov wrote: > > > > (removing from c/c -- too many mail not > > > > delivered) > > > > > > > > Hi Praveen, > > > > > > > > On Mon Sep 15, 2025 at 7:58 AM BST, Praveen Talari wrote: > > > > > Hi Alexey, > > > > > > > > > > Really appreciate you waiting! > > > > > > > > > > On 9/11/2025 2:30 PM, Alexey Klimov wrote: > > > > > > Hi Praveen, > > > > > > > > > > > > On Thu Sep 11, 2025 at 9:34 AM BST, Praveen Talari wrote: > > > > > > > Hi Alexy, > > > > > > > > > > > > > > Thank you for update. > > > > > > > > > > > > > > On 9/10/2025 1:35 AM, Alexey Klimov wrote: > > > > > > > > > > > > > > > > (adding Krzysztof to c/c) > > > > > > > > > > > > > > > > On Mon Sep 8, 2025 at 6:43 PM BST, Alexey Klimov wrote: > > > > > > > > > On Mon Sep 8, 2025 at 5:45 PM BST, Praveen Talari wrote: > > > > > > > > > > A deadlock is observed in the > > > > > > > > > > qcom_geni_serial driver during runtime > > > > > > > > > > resume. This occurs when the pinctrl > > > > > > > > > > subsystem reconfigures device pins > > > > > > > > > > via msm_pinmux_set_mux() while the serial device's interrupt is an > > > > > > > > > > active wakeup source. msm_pinmux_set_mux() calls disable_irq() or > > > > > > > > > > __synchronize_irq(), conflicting with the active wakeup state and > > > > > > > > > > causing the IRQ thread to enter an uninterruptible (D-state) sleep, > > > > > > > > > > leading to system instability. > > > > > > > > > > > > > > > > > > > > The critical call trace leading to the deadlock is: > > > > > > > > > > > > > > > > > > > >        Call trace: > > > > > > > > > >        __switch_to+0xe0/0x120 > > > > > > > > > >        __schedule+0x39c/0x978 > > > > > > > > > >        schedule+0x5c/0xf8 > > > > > > > > > >        __synchronize_irq+0x88/0xb4 > > > > > > > > > >        disable_irq+0x3c/0x4c > > > > > > > > > >        msm_pinmux_set_mux+0x508/0x644 > > > > > > > > > >        pinmux_enable_setting+0x190/0x2dc > > > > > > > > > >        pinctrl_commit_state+0x13c/0x208 > > > > > > > > > >        pinctrl_pm_select_default_state+0x4c/0xa4 > > > > > > > > > >        geni_se_resources_on+0xe8/0x154 > > > > > > > > > >        qcom_geni_serial_runtime_resume+0x4c/0x88 > > > > > > > > > >        pm_generic_runtime_resume+0x2c/0x44 > > > > > > > > > >        __genpd_runtime_resume+0x30/0x80 > > > > > > > > > >        genpd_runtime_resume+0x114/0x29c > > > > > > > > > >        __rpm_callback+0x48/0x1d8 > > > > > > > > > >        rpm_callback+0x6c/0x78 > > > > > > > > > >        rpm_resume+0x530/0x750 > > > > > > > > > >        __pm_runtime_resume+0x50/0x94 > > > > > > > > > >        handle_threaded_wake_irq+0x30/0x94 > > > > > > > > > >        irq_thread_fn+0x2c/xa8 > > > > > > > > > >        irq_thread+0x160/x248 > > > > > > > > > >        kthread+0x110/x114 > > > > > > > > > >        ret_from_fork+0x10/x20 > > > > > > > > > > > > > > > > > > > > To resolve this, explicitly manage the wakeup IRQ state within the > > > > > > > > > > runtime suspend/resume callbacks. In the > > > > > > > > > > runtime resume callback, call > > > > > > > > > > disable_irq_wake() before enabling resources. This preemptively > > > > > > > > > > removes the "wakeup" capability from the IRQ, allowing subsequent > > > > > > > > > > interrupt management calls to proceed > > > > > > > > > > without conflict. An error path > > > > > > > > > > re-enables the wakeup IRQ if resource enablement fails. > > > > > > > > > > > > > > > > > > > > Conversely, in runtime suspend, call > > > > > > > > > > enable_irq_wake() after resources > > > > > > > > > > are disabled. This ensures the interrupt is configured as a wakeup > > > > > > > > > > source only once the device has fully > > > > > > > > > > entered its low-power state. An > > > > > > > > > > error path handles disabling the wakeup IRQ > > > > > > > > > > if the suspend operation > > > > > > > > > > fails. > > > > > > > > > > > > > > > > > > > > Fixes: 1afa70632c39 ("serial: qcom-geni: > > > > > > > > > > Enable PM runtime for serial driver") > > > > > > > > > > Signed-off-by: Praveen Talari > > > > > > > > > > > > > > > > > > You forgot: > > > > > > > > > > > > > > > > > > Reported-by: Alexey Klimov > > > > > > > > > > > > > > > > > > Also, not sure where this change will go, via > > > > > > > > > Greg or Jiri, but ideally > > > > > > > > > this should be picked for current -rc cycle since regression is > > > > > > > > > introduced during latest merge window. > > > > > > > > > > > > > > > > > > I also would like to test it on qrb2210 rb1 where this regression is > > > > > > > > > reproduciable. > > > > Since I don't have this board, could you kindly validate the new change and > > run a quick test on your end? > > > > diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c > > b/drivers/pinctrl/qcom/pinctrl-msm.c > > index 83eb075b6bfa..3d6601dc6fcc 100644 > > --- a/drivers/pinctrl/qcom/pinctrl-msm.c > > +++ b/drivers/pinctrl/qcom/pinctrl-msm.c > > @@ -215,7 +215,7 @@ static int msm_pinmux_set_mux(struct pinctrl_dev > > *pctldev, > > */ > > if (d && i != gpio_func && > > !test_and_set_bit(d->hwirq, pctrl->disabled_for_mux)) > > - disable_irq(irq); > > + disable_irq_nosync(irq); > > > > raw_spin_lock_irqsave(&pctrl->lock, flags); > > > sorry Praveen, didnt see this proposal. testing on my end as well. > just tested on my end and all modules load - deadlocked before this update so there is progress (now we can load the network driver) I can see however irq/92 (threaded) stuck in D-state inside runtime pm root@qrb2210-rb1-core-kit:~# echo w > /proc/sysrq-trigger [ 498.247349] sysrq: Show Blocked State [ 498.251190] task:irq/92-4a8c000. state:D stack:0 pid:80 tgid:80 ppid:2 task_flags:0x208040 flags:0x00000010 [ 498.262334] Call trace: [ 498.264812] __switch_to+0xf0/0x1c0 (T) [ 498.268777] __schedule+0x110/0x9bc with irq92 being: 92: 199870 0 0 0 msmgpio 11 Level 4a8c000.serial:wakeup this log changes over time but it is alwas irq/92: root@qrb2210-rb1-core-kit:~# echo w > /proc/sysrq-trigger [90/66818] [ 613.019101] sysrq: Show Blocked State [ 613.023055] task:irq/92-4a8c000. state:D stack:0 pid:80 tgid:80 ppid:2 task_flags:0x208040 flags:0x00000010 [ 613.034189] Call trace: [ 613.036770] __switch_to+0xf0/0x1c0 (T) [ 613.040779] __schedule+0x35c/0x9bc [ 613.044412] schedule+0x34/0x110 [ 613.047782] rpm_resume+0x17c/0x690 [ 613.051359] __pm_runtime_resume+0x4c/0x98 [ 613.055556] handle_threaded_wake_irq+0x30/0x80 [ 613.060168] irq_thread_fn+0x28/0xa8 [ 613.063864] irq_thread+0x178/0x338 [ 613.067434] kthread+0x12c/0x210 [ 613.070735] ret_from_fork+0x10/0x20 root@qrb2210-rb1-core-kit:~# root@qrb2210-rb1-core-kit:~# echo w > /proc/sysrq-trigger [ 617.586960] sysrq: Show Blocked State [ 617.590771] task:irq/92-4a8c000. state:D stack:0 pid:80 tgid:80 ppid:2 task_flags:0x208040 flags:0x00000010 [ 617.601906] Call trace: [ 617.604442] __switch_to+0xf0/0x1c0 (T) [ 617.608408] __schedule+0x35c/0x9bc [ 617.612074] 0x766c7362 root@qrb2210-rb1-core-kit:~# root@qrb2210-rb1-core-kit:~# root@qrb2210-rb1-core-kit:~# echo w > /proc/sysrq-trigger [ 619.656937] sysrq: Show Blocked State [ 619.660847] task:irq/92-4a8c000. state:D stack:0 pid:80 tgid:80 ppid:2 task_flags:0x208040 flags:0x00000010 [ 619.672009] Call trace: [ 619.674531] __switch_to+0xf0/0x1c0 (T) [ 619.678508] __schedule+0x35c/0x9bc [ 619.682102] schedule+0x34/0x110 [ 619.685488] schedule_timeout+0x80/0x104 root@qrb2210-rb1-core-kit:~# root@qrb2210-rb1-core-kit:~# root@qrb2210-rb1-core-kit:~# echo w > /proc/sysrq-trigger [ 624.786811] sysrq: Show Blocked State root@qrb2210-rb1-core-kit:~# root@qrb2210-rb1-core-kit:~# root@qrb2210-rb1-core-kit:~# echo w > /proc/sysrq-trigger [ 630.546744] sysrq: Show Blocked State [ 630.550593] task:irq/92-4a8c000. state:D stack:0 pid:80 tgid:80 ppid:2 task_flags:0x208040 flags:0x00000010 [ 630.561724] Call trace: [ 630.564219] __switch_to+0xf0/0x1c0 (T) [ 630.568138] __schedule+0x35c/0x9bc [ 630.571729] 0x766c7362 root@qrb2210-rb1-core-kit:~#