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Signed-off-by: Peng Fan Acked-by: Sudeep Holla --- .../firmware/arm_scmi/vendors/imx/imx-sm-misc.c | 83 ++++++++++++++++++= ++++ include/linux/scmi_imx_protocol.h | 2 + 2 files changed, 85 insertions(+) diff --git a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c b/drivers/= firmware/arm_scmi/vendors/imx/imx-sm-misc.c index 700a3f24f4efc153ca4a9ef1a9e50a7ece492a18..eae0b0562f6cf1931be612852ba= 2651f60820e6d 100644 --- a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c +++ b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c @@ -28,6 +28,7 @@ enum scmi_imx_misc_protocol_cmd { SCMI_IMX_MISC_DISCOVER_BUILD_INFO =3D 0x6, SCMI_IMX_MISC_CTRL_NOTIFY =3D 0x8, SCMI_IMX_MISC_CFG_INFO_GET =3D 0xC, + SCMI_IMX_MISC_SYSLOG_GET =3D 0xD, SCMI_IMX_MISC_BOARD_INFO =3D 0xE, }; =20 @@ -89,6 +90,19 @@ struct scmi_imx_misc_cfg_info_out { u8 cfgname[MISC_MAX_CFGNAME]; }; =20 +struct scmi_imx_misc_syslog_in { + __le32 flags; + __le32 index; +}; + +#define REMAINING(x) le32_get_bits((x), GENMASK(31, 20)) +#define RETURNED(x) le32_get_bits((x), GENMASK(11, 0)) + +struct scmi_imx_misc_syslog_out { + __le32 numlogflags; + __le32 syslog[]; +}; + static int scmi_imx_misc_attributes_get(const struct scmi_protocol_handle = *ph, struct scmi_imx_misc_info *mi) { @@ -371,10 +385,79 @@ static int scmi_imx_misc_cfg_info_get(const struct sc= mi_protocol_handle *ph) return ret; } =20 +struct scmi_imx_misc_syslog_ipriv { + u32 *array; + u16 *size; +}; + +static void iter_misc_syslog_prepare_message(void *message, u32 desc_index, + const void *priv) +{ + struct scmi_imx_misc_syslog_in *msg =3D message; + + msg->flags =3D cpu_to_le32(0); + msg->index =3D cpu_to_le32(desc_index); +} + +static int iter_misc_syslog_update_state(struct scmi_iterator_state *st, + const void *response, void *priv) +{ + const struct scmi_imx_misc_syslog_out *r =3D response; + struct scmi_imx_misc_syslog_ipriv *p =3D priv; + + st->num_returned =3D RETURNED(r->numlogflags); + st->num_remaining =3D REMAINING(r->numlogflags); + *p->size =3D st->num_returned + st->num_remaining; + + return 0; +} + +static int +iter_misc_syslog_process_response(const struct scmi_protocol_handle *ph, + const void *response, + struct scmi_iterator_state *st, void *priv) +{ + const struct scmi_imx_misc_syslog_out *r =3D response; + struct scmi_imx_misc_syslog_ipriv *p =3D priv; + + p->array[st->desc_index + st->loop_idx] =3D + le32_to_cpu(r->syslog[st->loop_idx]); + + return 0; +} + +static int scmi_imx_misc_syslog_get(const struct scmi_protocol_handle *ph,= u16 *size, + void *array) +{ + struct scmi_iterator_ops ops =3D { + .prepare_message =3D iter_misc_syslog_prepare_message, + .update_state =3D iter_misc_syslog_update_state, + .process_response =3D iter_misc_syslog_process_response, + }; + struct scmi_imx_misc_syslog_ipriv ipriv =3D { + .array =3D array, + .size =3D size, + }; + void *iter; + + if (!array || !size || !*size) + return -EINVAL; + + iter =3D ph->hops->iter_response_init(ph, &ops, *size, SCMI_IMX_MISC_SYSL= OG_GET, + sizeof(struct scmi_imx_misc_syslog_in), + &ipriv); + if (IS_ERR(iter)) + return PTR_ERR(iter); + + /* If firmware return NOT SUPPORTED, propagate value to caller */ + return ph->hops->iter_response_run(iter); +} + static const struct scmi_imx_misc_proto_ops scmi_imx_misc_proto_ops =3D { .misc_ctrl_set =3D scmi_imx_misc_ctrl_set, .misc_ctrl_get =3D scmi_imx_misc_ctrl_get, .misc_ctrl_req_notify =3D scmi_imx_misc_ctrl_notify, + .misc_syslog =3D scmi_imx_misc_syslog_get, }; =20 static int scmi_imx_misc_protocol_init(const struct scmi_protocol_handle *= ph) diff --git a/include/linux/scmi_imx_protocol.h b/include/linux/scmi_imx_pro= tocol.h index 27bd372cbfb142b6acb0b1cf4b82f061529d0d45..2407d7693b6ba1303e07629e45e= 2a7eaaa906fd3 100644 --- a/include/linux/scmi_imx_protocol.h +++ b/include/linux/scmi_imx_protocol.h @@ -59,6 +59,8 @@ struct scmi_imx_misc_proto_ops { u32 *num, u32 *val); int (*misc_ctrl_req_notify)(const struct scmi_protocol_handle *ph, u32 ctrl_id, u32 evt_id, u32 flags); + int (*misc_syslog)(const struct scmi_protocol_handle *ph, u16 *size, + void *array); }; =20 /* See LMM_ATTRIBUTES in imx95.rst */ --=20 2.37.1 From nobody Sat Feb 7 09:46:57 2026 Received: from OSPPR02CU001.outbound.protection.outlook.com (mail-norwayeastazon11013034.outbound.protection.outlook.com [40.107.159.34]) (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 75265339B4E; 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static struct scmi_protocol_handle *ph; @@ -44,10 +48,38 @@ static int scmi_imx_misc_ctrl_notifier(struct notifier_= block *nb, return 0; } =20 +static int syslog_show(struct seq_file *file, void *priv) +{ + /* 4KB is large enough for syslog */ + void *syslog __free(kfree) =3D kmalloc(SZ_4K, GFP_KERNEL); + /* syslog API use num words, not num bytes */ + u16 size =3D SZ_4K / 4; + int ret; + + if (!ph) + return -ENODEV; + + ret =3D imx_misc_ctrl_ops->misc_syslog(ph, &size, syslog); + if (ret) + return ret; + + seq_hex_dump(file, " ", DUMP_PREFIX_NONE, 16, sizeof(u32), syslog, size *= 4, false); + seq_putc(file, '\n'); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(syslog); + +static void scmi_imx_misc_put(void *p) +{ + debugfs_remove((struct dentry *)p); +} + static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev) { const struct scmi_handle *handle =3D sdev->handle; struct device_node *np =3D sdev->dev.of_node; + struct dentry *scmi_imx_dentry; u32 src_id, flags; int ret, i, num; =20 @@ -98,7 +130,10 @@ static int scmi_imx_misc_ctrl_probe(struct scmi_device = *sdev) } } =20 - return 0; + scmi_imx_dentry =3D debugfs_create_dir("scmi_imx", NULL); + debugfs_create_file("syslog", 0444, scmi_imx_dentry, &sdev->dev, &syslog_= fops); + + return devm_add_action_or_reset(&sdev->dev, scmi_imx_misc_put, scmi_imx_d= entry); } =20 static const struct scmi_device_id scmi_id_table[] =3D { --=20 2.37.1