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firmware: imx: sm-misc: Dump syslog info

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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>
This commit is contained in:
Peng Fan 2025-10-29 20:07:02 +08:00 • committed by Shawn Guo
parent 4fa62e80c7
commit 80a4062e88
1 changed files with 36 additions and 1 deletions
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37
drivers/firmware/imx/sm-misc.c
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@ -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[] = {