From nobody Thu Dec 18 02:44:10 2025 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 121D92FF142 for ; Sun, 9 Nov 2025 14:38:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762699132; cv=none; b=NHzIM2ihnTT26fSEqxuqJ0F0rUVV1MmYt+JKWyYhQgU55E74rKcMiCX/9ZIYEj9HNAFnAb9Wbxut+i5XMNzjZHQvexzvtB5Z9jn/gCEEqCpumN8G1q/SnPl3uwUe0X1L5ebLOJOvKRK6YUDbqqog9GosAeltnM0CsVo5EaGpwJE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762699132; c=relaxed/simple; bh=p8VTlQ3pXarRYayw8UBrYcTj+4OjWYYKSpMSZeU0bPM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=uBkgAlhmEgX3gobZbm8vmPJvDBQROBu7gPLbKsRIUiLmxA1ZVk+a8KLwU66oOK07FLvM9787Zaw6kxNWxbE2eYi/Xd/GGdX8IYIASfXkhBDt5ncWSDgG/RT2Btb0kmqfrM9X8KG86bitVJ6kYmyC6QWE27Icyax85CaH+8hxWd4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=Z/frQ9Ff; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=hgFRdL8P; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="Z/frQ9Ff"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="hgFRdL8P" Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 5A9BK3ax457367 for ; Sun, 9 Nov 2025 14:38:49 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= PHiUGzt7WA5d+ZZv2cAEdOLPNuf+lkNI7THaM5BmfBE=; b=Z/frQ9Ff9WvMicSf jXePQiSoQ2DCGdI57w/z4ylqCylDODHu4P11/CPUpUTBVhxa6lqXX24xUWKEVNei K28GJrz+2qUR4jSnU81xzsyG8e4ey3To1iSlmFaU7sm/p2pP7OvPx2Le9QYB4WkS g7O9mdU0ZY+W6FsN19wOfeD/ylwHROcMZPsXTGluKMA1dExpOw7dtyLpqDj3hdr1 BfR/F6FxZxnTWQ9xQhVF3x/DdZvqVUsFXDPprIC2voHF5/aPTbHaqIvSKdYi2a4w 8ViGj/xyE+eyU4bzexf/YfLdClCKkLAaNzK6mJq2yRET2pBzKbeHJ4uYPW7KQ3R2 UKLBcA== Received: from mail-pj1-f69.google.com (mail-pj1-f69.google.com [209.85.216.69]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4a9xu2t815-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Sun, 09 Nov 2025 14:38:48 +0000 (GMT) Received: by mail-pj1-f69.google.com with SMTP id 98e67ed59e1d1-3436d53e990so1051121a91.2 for ; Sun, 09 Nov 2025 06:38:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1762699128; x=1763303928; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=PHiUGzt7WA5d+ZZv2cAEdOLPNuf+lkNI7THaM5BmfBE=; b=hgFRdL8PPfoZHEanfw7qP1yLBaaLKopfMnV9o4NmKWCQQ7msoDomIgY6Y31XLpwEuc 2QgQari+Z5TEtVNJ9SBIIPhJbLb22KZ+qDWQhM8rELC7BIDrA4yClLzVQnVGntNboOF2 Ex7GduGZuV3DowEMBuLhaOjh1obvtY627ryTPy35WsPVNsN83Fb19JCJA5MAhnlUOUa4 5WE/uEouCArrB9jb6TMvy14Y7CkdSCpHdtxaUM7qwVijuJ6XR5Bvp26tqIWw26PC39OJ n3uNl1PsvcQ51MO05gzn8XzMgABmYMUsHZuNJhZR2+7OxWTYCx+DRvc+0c4/96YUjE0T /7Eg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762699128; x=1763303928; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=PHiUGzt7WA5d+ZZv2cAEdOLPNuf+lkNI7THaM5BmfBE=; b=KVVaZpJyWUF54LKQEs27GIcSHRjRo0+njaOx1YMKLrhZ6VgmB1s8UHUg/YJYUUrH3t 7ItDtijm1Z20rNi4okxpJ+yHclRshOK5dsiC6dY/LZSOyCGdBMFiDCBnorvhxeEH0xwI k1ut0DFfvfi1SIX33MPOsaVzt49qrId8eguZDdc4mOnIFnxSKmfpanXgqY+xXiybTaDj NksB5KYOtPXJaTxndr1ER0jktVQpg77etgJmMNy0acKyDTy7zCGX6J5/z1nYI0l30yAG kd6uwV98YuuPdMYSl5rqJn4fQ+r55wU2Np7zgoqXiFPMe4J0Gqajvd7+nzean+HoriG8 QazA== X-Forwarded-Encrypted: i=1; AJvYcCUIQlCerZoziPoVYZ+GBhWXFum8wMjnIA1vWjV9JMfVYhB+nAhXuyDVE5npYo8vVkS/1pzzm2oWLLHvTLU=@vger.kernel.org X-Gm-Message-State: AOJu0YyVrVehK8SVHHhc9VLt5qiDDPGBgiAyHGjaJ985j6HvqTcJmUTe ZDiGlVRFeh+P/chhv2x8EikuRzMfGojHIFR1KelH6ELHXJ+hL5tFFVhn/hSf41T2jXQh6ZHfOnS yTrTiPL/9lF2uWYs2GVz+0IfujYzg4yksAG+Rn2iFpqG52jgErqAySxU61bZ9i0zmqHs= X-Gm-Gg: ASbGncvJo8P8ZEG9tCSz9g0q8wEFIF5bGxjOyYCIso1u4+yLYsHGgJ2ncyJjs5Uqdv0 eMLdBbMRZZTvs3/WLEYk31agYvivjYu1f9oFmlfVt0cO7Hh28DTa9hhR51+sSrUfksmD6AQrW/R d2n85Kl4NNCbLtvZXRqjc+K0hFrSJZEX+VBwJq/WQ01seUozJramvxluoAer+bI7JGxWaMS/WCZ 1uYu1br4mBDyQ2BEAqF5sYtpMBT70bXjJ8njIM1E2Hq5i7DMty8Bmc5kPFY3unoBtzeYNy7MG2B gOe+qZrtLfxYzN6HngT/2X+P3HSLDKJG2O0lc3dYoCiwYA/qRwdiTAEWo+EPilc9fmlVL2rx5OU 6nwy7ZOMWJmbkY0dt2+vy3/36P9ZhMpqf32Y= X-Received: by 2002:a17:90a:bf11:b0:343:7714:4ca6 with SMTP id 98e67ed59e1d1-34377144d90mr3756486a91.22.1762699127672; Sun, 09 Nov 2025 06:38:47 -0800 (PST) X-Google-Smtp-Source: AGHT+IHJi8IG6JcT7AZMHFUMvIpgZqX/jl5jfBcQHPdOcQ8sjNa1J3m8dUnVgXFrv/h62wi7ogujmw== X-Received: by 2002:a17:90a:bf11:b0:343:7714:4ca6 with SMTP id 98e67ed59e1d1-34377144d90mr3756460a91.22.1762699127112; Sun, 09 Nov 2025 06:38:47 -0800 (PST) Received: from hu-spratap-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-341a68a68e6sm14845401a91.4.2025.11.09.06.38.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Nov 2025 06:38:46 -0800 (PST) From: Shivendra Pratap Date: Sun, 09 Nov 2025 20:07:18 +0530 Subject: [PATCH v17 05/12] power: reset: reboot-mode: Expose sysfs for registered reboot_modes Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251109-arm-psci-system_reset2-vendor-reboots-v17-5-46e085bca4cc@oss.qualcomm.com> References: <20251109-arm-psci-system_reset2-vendor-reboots-v17-0-46e085bca4cc@oss.qualcomm.com> In-Reply-To: <20251109-arm-psci-system_reset2-vendor-reboots-v17-0-46e085bca4cc@oss.qualcomm.com> To: Bartosz Golaszewski , Bjorn Andersson , Sebastian Reichel , Rob Herring , Sudeep Holla , Souvik Chakravarty , Krzysztof Kozlowski , Conor Dooley , Andy Yan , Mark Rutland , Lorenzo Pieralisi , Arnd Bergmann , Konrad Dybcio , cros-qcom-dts-watchers@chromium.org, Vinod Koul , Catalin Marinas , Will Deacon , Florian Fainelli , Moritz Fischer , John Stultz , Matthias Brugger , Krzysztof Kozlowski Cc: Dmitry Baryshkov , Mukesh Ojha , Stephen Boyd , Andre Draszik , Kathiravan Thirumoorthy , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Elliot Berman , Shivendra Pratap , Xin Liu , Srinivas Kandagatla X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1762699073; l=5178; i=shivendra.pratap@oss.qualcomm.com; s=20250710; h=from:subject:message-id; bh=p8VTlQ3pXarRYayw8UBrYcTj+4OjWYYKSpMSZeU0bPM=; b=MD9m7lTEeVEibrUjikce7zPcaS1semLkXOkrguR66wGJvIqOv+EHyzaYktJlvdV2jDw8VWpxB tIqnoN5SuPkBCmyCv5QcKTnCU5JaIMN/Q1g3pDkebYFGBmrGkIioukZ X-Developer-Key: i=shivendra.pratap@oss.qualcomm.com; a=ed25519; pk=CpsuL7yZ8NReDPhGgq6Xn/SRoa59mAvzWOW0QZoo4gw= X-Authority-Analysis: v=2.4 cv=dMWrWeZb c=1 sm=1 tr=0 ts=6910a778 cx=c_pps a=vVfyC5vLCtgYJKYeQD43oA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=ogmrOWMnV0kDla0zgWoA:9 a=QEXdDO2ut3YA:10 a=rl5im9kqc5Lf4LNbBjHf:22 X-Proofpoint-GUID: CkbwjbWJaEeqeHYx1xDjB8iJAP80R93x X-Proofpoint-ORIG-GUID: CkbwjbWJaEeqeHYx1xDjB8iJAP80R93x X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA5MDEyOSBTYWx0ZWRfXyIuBe6r4WQDA Xvy9uOHVpQoqxtFGu9YH2NHlKOZTQl60QGkD+8fp+HtNKu29dPOMcqqiHfF3s8XTGuUwC81iOEO xbyxQdL3VlVzY3iLN/saNwz222BHqqMwwQrskFX+QVnqzXrpIeItTYWpaSeK1qZj2FgeXicF8g3 MUUfX/KF57zRHfjDMDo280aKE8fXAyi36pSGEQqGhiulPGgs36sTHODMHbXIb7QRTECEGjOJZZV m6jbnQ2JUThRUmhBv5NQleG3WHpbdgYrGQyALzkxtKhnjID33yT3nUbogSPWUhIcnI/KKF+qqTs J/OkYE54m3XJyQgeIEGKVB6A7R8YSCVTTuaHgMmo1CavLzttV/MYtL88PWWC/vLTFiCxhbqI2VS 7ayTnjwuFfp/jNUZcAkkc7cgBIwiUQ== 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=2025-11-09_06,2025-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 impostorscore=0 malwarescore=0 adultscore=0 suspectscore=0 priorityscore=1501 bulkscore=0 phishscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511090129 Currently, there is no standardized mechanism for userspace to discover which reboot-modes are supported on a given platform. This limitation forces tools and scripts to rely on hardcoded assumptions about the supported reboot-modes. Create a class 'reboot-mode' and a device under it to expose a sysfs interface to show the available reboot mode arguments to userspace. Use the driver_name field of the struct reboot_mode_driver to create the device. For device-based drivers, configure the device driver name as driver_name. This results in the creation of: /sys/class/reboot-mode//reboot_modes This read-only sysfs file will exposes the list of supported reboot modes arguments provided by the driver, enabling userspace to query the list of arguments. Signed-off-by: Shivendra Pratap --- drivers/power/reset/reboot-mode.c | 62 +++++++++++++++++++++++++++++++++++= +++- include/linux/reboot-mode.h | 2 ++ 2 files changed, 63 insertions(+), 1 deletion(-) diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot= -mode.c index 873ac45cd7659b214b7c21958f580ca381e0a63d..582aa7f8ed7fa485c5a67877558= c9b15d3600ef4 100644 --- a/drivers/power/reset/reboot-mode.c +++ b/drivers/power/reset/reboot-mode.c @@ -6,6 +6,7 @@ #define pr_fmt(fmt) "reboot-mode: " fmt =20 #include +#include #include #include #include @@ -23,6 +24,8 @@ struct mode_info { struct list_head list; }; =20 +static struct class *rb_class; + static u64 get_reboot_mode_magic(struct reboot_mode_driver *reboot, const = char *cmd) { const char *normal =3D "normal"; @@ -65,6 +68,51 @@ static int reboot_mode_notify(struct notifier_block *thi= s, return NOTIFY_DONE; } =20 +static ssize_t reboot_modes_show(struct device *dev, struct device_attribu= te *attr, char *buf) +{ + struct reboot_mode_driver *reboot; + struct mode_info *info; + ssize_t size =3D 0; + + reboot =3D (struct reboot_mode_driver *)dev_get_drvdata(dev); + if (!reboot) + return -ENODATA; + + list_for_each_entry(info, &reboot->head, list) + size +=3D sysfs_emit_at(buf, size, "%s ", info->mode); + + if (size) { + size +=3D sysfs_emit_at(buf, size - 1, "\n"); + return size; + } + + return -ENODATA; +} +static DEVICE_ATTR_RO(reboot_modes); + +static int create_reboot_mode_device(struct reboot_mode_driver *reboot) +{ + int ret =3D 0; + + if (!rb_class) { + rb_class =3D class_create("reboot-mode"); + if (IS_ERR(rb_class)) + return PTR_ERR(rb_class); + } + + reboot->reboot_dev =3D device_create(rb_class, NULL, 0, (void *)reboot, r= eboot->driver_name); + if (IS_ERR(reboot->reboot_dev)) + return PTR_ERR(reboot->reboot_dev); + + ret =3D device_create_file(reboot->reboot_dev, &dev_attr_reboot_modes); + if (ret) { + device_unregister(reboot->reboot_dev); + return ret; + } + + return ret; +} + /** * reboot_mode_register - register a reboot mode driver * @reboot: reboot mode driver @@ -83,13 +131,17 @@ int reboot_mode_register(struct reboot_mode_driver *re= boot, struct fwnode_handle u32 magic_arg2; int ret; =20 - if (!fwnode) + if (!fwnode || !reboot->driver_name) return -EINVAL; =20 np =3D to_of_node(fwnode); if (!np) return -EINVAL; =20 + ret =3D create_reboot_mode_device(reboot); + if (ret) + return ret; + INIT_LIST_HEAD(&reboot->head); =20 for_each_property_of_node(np, prop) { @@ -142,6 +194,8 @@ int reboot_mode_register(struct reboot_mode_driver *reb= oot, struct fwnode_handle kfree(info); } =20 + device_remove_file(reboot->reboot_dev, &dev_attr_reboot_modes); + device_unregister(reboot->reboot_dev); return ret; } EXPORT_SYMBOL_GPL(reboot_mode_register); @@ -155,6 +209,9 @@ int reboot_mode_unregister(struct reboot_mode_driver *r= eboot) struct mode_info *info; struct mode_info *next; =20 + if (!reboot->reboot_dev) + return -EINVAL; + unregister_reboot_notifier(&reboot->reboot_notifier); =20 list_for_each_entry_safe(info, next, &reboot->head, list) { @@ -163,6 +220,8 @@ int reboot_mode_unregister(struct reboot_mode_driver *r= eboot) kfree(info); } =20 + device_remove_file(reboot->reboot_dev, &dev_attr_reboot_modes); + device_unregister(reboot->reboot_dev); return 0; } EXPORT_SYMBOL_GPL(reboot_mode_unregister); @@ -192,6 +251,7 @@ int devm_reboot_mode_register(struct device *dev, if (!dr) return -ENOMEM; =20 + reboot->driver_name =3D reboot->dev->driver->name; rc =3D reboot_mode_register(reboot, of_fwnode_handle(reboot->dev->of_node= )); if (rc) { devres_free(dr); diff --git a/include/linux/reboot-mode.h b/include/linux/reboot-mode.h index e0d3e8a54050a76f26846f456120b4c7e371d284..81c149edf40fbcf0d3427c2e12e= b415199cb153b 100644 --- a/include/linux/reboot-mode.h +++ b/include/linux/reboot-mode.h @@ -7,6 +7,8 @@ =20 struct reboot_mode_driver { struct device *dev; + struct device *reboot_dev; + const char *driver_name; struct list_head head; int (*write)(struct reboot_mode_driver *reboot, u64 magic); struct notifier_block reboot_notifier; --=20 2.34.1