diff options
| author | Peng Fan <peng.fan@nxp.com> | 2025-10-29 20:07:02 +0800 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2026-01-17 10:32:21 +0800 |
| commit | 80a4062e8821861c3ce7407ea5b23afa959917e2 (patch) | |
| tree | 23b1211568538590f24d2fff41fcbc672901562b /drivers/firmware | |
| parent | 4fa62e80c7dba7ff419dea23f10bcb125e38bde3 (diff) | |
firmware: imx: sm-misc: Dump syslog info
Add debugfs interface to read System Manager syslog info
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/imx/sm-misc.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/drivers/firmware/imx/sm-misc.c b/drivers/firmware/imx/sm-misc.c index fc3ee12c2be8..0a8ada329c9d 100644 --- a/drivers/firmware/imx/sm-misc.c +++ b/drivers/firmware/imx/sm-misc.c @@ -3,12 +3,16 @@ * Copyright 2024 NXP */ +#include <linux/debugfs.h> +#include <linux/device/devres.h> #include <linux/firmware/imx/sm.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/scmi_protocol.h> #include <linux/scmi_imx_protocol.h> +#include <linux/seq_file.h> +#include <linux/sizes.h> static const struct scmi_imx_misc_proto_ops *imx_misc_ctrl_ops; static struct scmi_protocol_handle *ph; @@ -44,10 +48,38 @@ static int scmi_imx_misc_ctrl_notifier(struct notifier_block *nb, return 0; } +static int syslog_show(struct seq_file *file, void *priv) +{ + /* 4KB is large enough for syslog */ + void *syslog __free(kfree) = kmalloc(SZ_4K, GFP_KERNEL); + /* syslog API use num words, not num bytes */ + u16 size = SZ_4K / 4; + int ret; + + if (!ph) + return -ENODEV; + + ret = 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 = sdev->handle; struct device_node *np = sdev->dev.of_node; + struct dentry *scmi_imx_dentry; u32 src_id, flags; int ret, i, num; @@ -98,7 +130,10 @@ static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev) } } - return 0; + scmi_imx_dentry = 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_dentry); } static const struct scmi_device_id scmi_id_table[] = { |