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Thu, 20 Aug 2026 12:48:55 -0700 (PDT) From: Hans de Goede To: Bjorn Andersson , Cristian Marussi , Sudeep Holla Cc: Hans de Goede , Daniel Lezcano , arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org, Bjorn Andersson Subject: [PATCH v3 1/3] module: add SCMI device table alias support Date: Thu, 20 Aug 2026 21:48:48 +0200 Message-ID: <20260820194850.459739-2-johannes.goede@oss.qualcomm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260820194850.459739-1-johannes.goede@oss.qualcomm.com> References: <20260820194850.459739-1-johannes.goede@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: aFN1mDYQ3cH1bwGWEjL26lzfrDcLCo2s X-Authority-Analysis: v=2.4 cv=V8BNF+ni c=1 sm=1 tr=0 ts=6a875a29 cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=xqWC_Br6kY4A:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=bC-a23v3AAAA:8 a=NbjprmzQH6tOvfj-_-IA:9 a=PEH46H7Ffwr30OY-TuGO:22 a=FO4_E8m0qiDe52t0p3_H:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODIwMDE0OSBTYWx0ZWRfXwmbHaB6va9L4 Q1CrdW7+EI1Z459nuvs/eo3bkAsag57ey7fkkzesPn6Lt5bxVY2MQ5PXs8Dw59NBCZQaWpJcVYt k2q1eI3bKRyBsiwMDWzn/kWlLxpHTqwABSw8pzZn55Rbr6ifJCr9PJgORGP61Opkh/75Fgk/jX2 MhXIchujvqOvOJr5nUQv2OchBJxOoDxnXZ4ES2I7QHcvX1FbFTbRQk0MZhTPmJkwGgGWz6cZGjc MdSS4j0sNUl2WUcPFoLQ86r54flcRrAYMXcOKkfnhGpo9htNIOQnnApNuyUNHeHOIUF7EzaLvSn zHY0Tm1GBzjNadPyisr9ICgcC3q5wXLPGA1BYqzx6E8spPp6Mnu4XAGONGpsx3YUDplk5fY9GtJ HU1ThdATCxctrXWHVDN5VlbTZ6y21r4sxKIh7SMJTBI3nAL3h09szyqqhU15K0A4e5f7KPwTg0j Nv7ltK/TCG0doQSW9GQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwODIwMDE0OSBTYWx0ZWRfXzozsWkIcgTyI ftR93jbSUgnU4D3jkEENpegcc39OIS2UicAHajIuJNdsNjP9g2kcFPxBQw1aI7iAuFS08d0BRlm i4DkAh6DQc5+B6ekDz3kP/1rre1fq2Q= X-Proofpoint-GUID: aFN1mDYQ3cH1bwGWEjL26lzfrDcLCo2s X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-20_01,2026-08-20_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 clxscore=1015 bulkscore=0 adultscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 suspectscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608200149 Content-Type: text/plain; charset="utf-8" From: Bjorn Andersson SCMI client drivers already describe their bus match data with MODULE_DEVICE_TABLE(scmi, ...), but modpost does not know how to consume SCMI device tables. As a result, SCMI modules do not get generated module aliases from their id tables. Move struct scmi_device_id to mod_devicetable.h so it has a fixed layout visible to modpost, add the corresponding generated offsets and teach file2alias to emit scmi:: aliases. Use the same stable alias format for SCMI device uevents and sysfs modaliases. The previous string included the instance-specific device name, which is not useful for matching modules. Assisted-by: Codex:GPT-5.5 Reviewed-by: Hans de Goede Tested-by: Hans de Goede Signed-off-by: Bjorn Andersson Signed-off-by: Hans de Goede --- Changes in v3: - Adjust for ad428f5811bd ("mod_devicetable.h: Split into per subsystem headers") - Add '\n' to modalias_show() output, matching other subsystems' modalias - Link to v2: https://lore.kernel.org/all/20260618-scmi-modalias-v2-1-8c754= 7c1be21@oss.qualcomm.com/ Changes in v2: - Drop #include from scmi_protocol.h - Link to v1: https://patch.msgid.link/20260616-scmi-modalias-v1-0-662b8dd5= 2ab2@oss.qualcomm.com --- MAINTAINERS | 1 + drivers/firmware/arm_scmi/bus.c | 21 ++++++++++----------- include/linux/device-id/scmi.h | 19 +++++++++++++++++++ include/linux/mod_devicetable.h | 1 + include/linux/scmi_protocol.h | 6 +----- scripts/mod/devicetable-offsets.c | 4 ++++ scripts/mod/file2alias.c | 11 +++++++++++ 7 files changed, 47 insertions(+), 16 deletions(-) create mode 100644 include/linux/device-id/scmi.h diff --git a/MAINTAINERS b/MAINTAINERS index fc6ca082106f..ee5beee606fc 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -26334,6 +26334,7 @@ F: drivers/pmdomain/arm/ F: drivers/powercap/arm_scmi_powercap.c F: drivers/regulator/scmi-regulator.c F: drivers/reset/reset-scmi.c +F: include/linux/device-id/scmi.h F: include/linux/sc[mp]i_protocol.h F: include/trace/events/scmi.h F: include/uapi/linux/virtio_scmi.h diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bu= s.c index 793be9eabaed..d12d5de15a1a 100644 --- a/drivers/firmware/arm_scmi/bus.c +++ b/drivers/firmware/arm_scmi/bus.c @@ -13,11 +13,12 @@ #include #include #include +#include #include =20 #include "common.h" =20 -#define SCMI_UEVENT_MODALIAS_FMT "%s:%02x:%s" +#define SCMI_UEVENT_MODALIAS_FMT SCMI_MODULE_PREFIX "%02x:%s" =20 BLOCKING_NOTIFIER_HEAD(scmi_requested_devices_nh); EXPORT_SYMBOL_GPL(scmi_requested_devices_nh); @@ -141,7 +142,7 @@ static int scmi_protocol_table_register(const struct sc= mi_device_id *id_table) int ret =3D 0; const struct scmi_device_id *entry; =20 - for (entry =3D id_table; entry->name && ret =3D=3D 0; entry++) + for (entry =3D id_table; entry->name[0] && ret =3D=3D 0; entry++) ret =3D scmi_protocol_device_request(entry); =20 return ret; @@ -197,18 +198,18 @@ scmi_protocol_table_unregister(const struct scmi_devi= ce_id *id_table) { const struct scmi_device_id *entry; =20 - for (entry =3D id_table; entry->name; entry++) + for (entry =3D id_table; entry->name[0]; entry++) scmi_protocol_device_unrequest(entry); } =20 static int scmi_dev_match_by_id_table(struct scmi_device *scmi_dev, const struct scmi_device_id *id_table) { - if (!id_table || !id_table->name) + if (!id_table || !id_table->name[0]) return 0; =20 /* Always skip transport devices from matching */ - for (; id_table->protocol_id && id_table->name; id_table++) + for (; id_table->protocol_id && id_table->name[0]; id_table++) if (id_table->protocol_id =3D=3D scmi_dev->protocol_id && strncmp(scmi_dev->name, "__scmi_transport_device", 23) && !strcmp(id_table->name, scmi_dev->name)) @@ -245,7 +246,7 @@ static struct scmi_device *scmi_child_dev_find(struct d= evice *parent, struct device *dev; =20 id_table[0].protocol_id =3D prot_id; - id_table[0].name =3D name; + strscpy(id_table[0].name, name, sizeof(id_table[0].name)); =20 dev =3D device_find_child(parent, &id_table, scmi_match_by_id_table); if (!dev) @@ -282,8 +283,7 @@ static int scmi_device_uevent(const struct device *dev,= struct kobj_uevent_env * const struct scmi_device *scmi_dev =3D to_scmi_dev(dev); =20 return add_uevent_var(env, "MODALIAS=3D" SCMI_UEVENT_MODALIAS_FMT, - dev_name(&scmi_dev->dev), scmi_dev->protocol_id, - scmi_dev->name); + scmi_dev->protocol_id, scmi_dev->name); } =20 static ssize_t modalias_show(struct device *dev, @@ -291,9 +291,8 @@ static ssize_t modalias_show(struct device *dev, { struct scmi_device *scmi_dev =3D to_scmi_dev(dev); =20 - return sysfs_emit(buf, SCMI_UEVENT_MODALIAS_FMT, - dev_name(&scmi_dev->dev), scmi_dev->protocol_id, - scmi_dev->name); + return sysfs_emit(buf, SCMI_UEVENT_MODALIAS_FMT "\n", + scmi_dev->protocol_id, scmi_dev->name); } static DEVICE_ATTR_RO(modalias); =20 diff --git a/include/linux/device-id/scmi.h b/include/linux/device-id/scmi.h new file mode 100644 index 000000000000..4150481524d4 --- /dev/null +++ b/include/linux/device-id/scmi.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef LINUX_DEVICE_ID_SCMI_H +#define LINUX_DEVICE_ID_SCMI_H + +#ifdef __KERNEL__ +#include +typedef unsigned long kernel_ulong_t; +#endif + +#define SCMI_NAME_SIZE 32 +#define SCMI_MODULE_PREFIX "scmi:" + +struct scmi_device_id { + __u8 protocol_id; + char name[SCMI_NAME_SIZE]; + kernel_ulong_t driver_data; +}; + +#endif /* ifndef LINUX_DEVICE_ID_SCMI_H */ diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetabl= e.h index a397213bedac..d241421c36aa 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -49,6 +49,7 @@ #include "device-id/pnp.h" #include "device-id/rio.h" #include "device-id/rpmsg.h" +#include "device-id/scmi.h" #include "device-id/sdio.h" #include "device-id/sdw.h" #include "device-id/serio.h" diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h index 5ab73b1ab9aa..ba53302d95f5 100644 --- a/include/linux/scmi_protocol.h +++ b/include/linux/scmi_protocol.h @@ -9,6 +9,7 @@ #define _LINUX_SCMI_PROTOCOL_H =20 #include +#include #include #include #include @@ -951,11 +952,6 @@ struct scmi_device { =20 #define to_scmi_dev(d) container_of_const(d, struct scmi_device, dev) =20 -struct scmi_device_id { - u8 protocol_id; - const char *name; -}; - struct scmi_driver { const char *name; int (*probe)(struct scmi_device *sdev); diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-of= fsets.c index b4178c42d08f..da5bd712c8da 100644 --- a/scripts/mod/devicetable-offsets.c +++ b/scripts/mod/devicetable-offsets.c @@ -144,6 +144,10 @@ int main(void) DEVID(rpmsg_device_id); DEVID_FIELD(rpmsg_device_id, name); =20 + DEVID(scmi_device_id); + DEVID_FIELD(scmi_device_id, protocol_id); + DEVID_FIELD(scmi_device_id, name); + DEVID(i2c_device_id); DEVID_FIELD(i2c_device_id, name); =20 diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c index 8d36c74dec2d..a5283f4c8e6f 100644 --- a/scripts/mod/file2alias.c +++ b/scripts/mod/file2alias.c @@ -852,6 +852,16 @@ static void do_rpmsg_entry(struct module *mod, void *s= ymval) module_alias_printf(mod, false, RPMSG_DEVICE_MODALIAS_FMT, *name); } =20 +/* Looks like: scmi:NN:S */ +static void do_scmi_entry(struct module *mod, void *symval) +{ + DEF_FIELD(symval, scmi_device_id, protocol_id); 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charset="utf-8" From: Cristian Marussi Driver module auto-loading requires the devices to already be created for udev to get the necessary uevents based on which udev auto-loads modules. But SCMI devices are only created after their { protocol, name } tupples have been registered which is done from scmi_driver_register(). This creates a circular dependency where device creation is waiting for the driver to register and loading the module with the driver is waiting for the device to be created. Pre-register the tupples for standard protocols to break this circular dependency. Tested-by: Hans de Goede Signed-off-by: Cristian Marussi Signed-off-by: Hans de Goede --- Changes in v3: - Drop adding of a bus uevent function this is already done - Update comments and commit message with a better explanation of why - Link to v1/RFC: https://patch.msgid.link/20250203100154.140877-2-cristian= .marussi@arm.com --- drivers/firmware/arm_scmi/bus.c | 47 ++++++++++++++++++++++++++++----- 1 file changed, 40 insertions(+), 7 deletions(-) diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bu= s.c index d12d5de15a1a..111727904a89 100644 --- a/drivers/firmware/arm_scmi/bus.c +++ b/drivers/firmware/arm_scmi/bus.c @@ -77,12 +77,13 @@ static int scmi_protocol_device_request(const struct sc= mi_device_id *id_table) if (phead) { head =3D phead; list_for_each_entry(rdev, head, node) { + /* pr_debug() because dups are expected for std protocols */ if (!strcmp(rdev->id_table->name, id_table->name)) { - pr_err("Ignoring duplicate request [%d] %s\n", - rdev->id_table->protocol_id, - rdev->id_table->name); - ret =3D -EINVAL; - goto out; + pr_debug("Device already requested [%d] %s\n", + rdev->id_table->protocol_id, + rdev->id_table->name); + mutex_unlock(&scmi_requested_devices_mtx); + return 0; } } } @@ -579,17 +580,49 @@ static void scmi_devices_unregister(void) bus_for_each_dev(&scmi_bus_type, NULL, NULL, __scmi_devices_unregister); } =20 +/* Standard protocols table */ +static const struct scmi_device_id scmi_std_id_table[] =3D { + { SCMI_PROTOCOL_POWER, "genpd" }, + { SCMI_PROTOCOL_SYSTEM, "syspower" }, + { SCMI_PROTOCOL_PERF, "perf" }, + { SCMI_PROTOCOL_PERF, "cpufreq" }, + { SCMI_PROTOCOL_CLOCK, "clocks" }, + { SCMI_PROTOCOL_SENSOR, "hwmon" }, + { SCMI_PROTOCOL_SENSOR, "iiodev" }, + { SCMI_PROTOCOL_RESET, "reset" }, + { SCMI_PROTOCOL_VOLTAGE, "regulator" }, + { SCMI_PROTOCOL_POWERCAP, "powercap" }, + { SCMI_PROTOCOL_PINCTRL, "pinctrl" }, + { SCMI_PROTOCOL_PINCTRL, "pinctrl-imx" }, + { }, +}; + static int __init scmi_bus_init(void) { int retval; =20 retval =3D bus_register(&scmi_bus_type); - if (retval) + if (retval) { pr_err("SCMI protocol bus register failed (%d)\n", retval); + return retval; + } + + /* + * Driver module auto-loading requires the devices to already be created + * for udev to get the necessary uevents. 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Pre-register the tupples + * for known (in tree) drivers to break this circular dependency. + */ + retval =3D scmi_protocol_table_register(scmi_std_id_table); + if (retval) { + bus_unregister(&scmi_bus_type); + return retval; + } =20 pr_info("SCMI protocol bus registered\n"); =20 - return retval; + return 0; } subsys_initcall(scmi_bus_init); =20 --=20 2.55.0 From nobody Mon Sep 28 14:47:46 2026 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (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 4B06D3CF69C for ; Thu, 20 Aug 2026 19:49:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787255345; cv=none; b=M1Xr29q4HnjAIQbgvlKHh0OQBKH4mNuQ5qb8V0wL9fYr4zzx7tGD4gxnsMAhIiyGzFdFGcLDht4A7dfFzzuQhzXlbXULCT1ltI4erR6YJTtXhLxKmbSvuhY9RfW2UFDh7RBT4+eidTulvBTWT2PCFgusmbFrgWdkfgWqlKfIoDY= ARC-Message-Signature: i=1; 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charset="utf-8" There are in tree drivers for various IMX vendor protocols, also pre-register the { protocol, name } tupples for these to make module auto-loading work for these in tree drivers. Signed-off-by: Hans de Goede --- Changes in v3: - New patch in v3 of this patch-set --- drivers/firmware/arm_scmi/bus.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bu= s.c index 111727904a89..9f5740dc606f 100644 --- a/drivers/firmware/arm_scmi/bus.c +++ b/drivers/firmware/arm_scmi/bus.c @@ -15,6 +15,7 @@ #include #include #include +#include =20 #include "common.h" =20 @@ -580,8 +581,8 @@ static void scmi_devices_unregister(void) bus_for_each_dev(&scmi_bus_type, NULL, NULL, __scmi_devices_unregister); } =20 -/* Standard protocols table */ static const struct scmi_device_id scmi_std_id_table[] =3D { + /* Standard protocols */ { SCMI_PROTOCOL_POWER, "genpd" }, { SCMI_PROTOCOL_SYSTEM, "syspower" }, { SCMI_PROTOCOL_PERF, "perf" }, @@ -594,6 +595,12 @@ static const struct scmi_device_id scmi_std_id_table[]= =3D { { SCMI_PROTOCOL_POWERCAP, "powercap" }, { SCMI_PROTOCOL_PINCTRL, "pinctrl" }, { SCMI_PROTOCOL_PINCTRL, "pinctrl-imx" }, + /* Vendor protocols with in tree drivers */ + { SCMI_PROTOCOL_IMX_BBM, "imx-bbm-key" }, + { SCMI_PROTOCOL_IMX_BBM, "imx-bbm-rtc" }, + { SCMI_PROTOCOL_IMX_CPU, "imx-cpu" }, + { SCMI_PROTOCOL_IMX_LMM, "imx-lmm" }, + { SCMI_PROTOCOL_IMX_MISC, "imx-misc-ctrl" }, { }, }; =20 --=20 2.55.0