122 lines
3 KiB
C
122 lines
3 KiB
C
/*
|
|
* Copyright (c) 2022 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com
|
|
*
|
|
* Samsung TN debugging code
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/sec_debug.h>
|
|
|
|
/*
|
|
dhist_base = sec_extra_info_base + SEC_DEBUG_SIZE_OFFS
|
|
bore_base = dhist_base + SEC_DEBUG_SIZE_OFFS
|
|
|
|
---------------------------------------- sec-autocomment base
|
|
- SZ_64K -
|
|
---------------------------------------- sec-extrainfo base
|
|
- SEC_DEBUG_SIZE_OFFS -
|
|
---------------------------------------- debug-history base
|
|
- SEC_DEBUG_SIZE_OFFS -
|
|
---------------------------------------- bore base
|
|
- SEC_DEBUG_SIZE_OFFS -
|
|
---------------------------------------- sec-initlog
|
|
*/
|
|
|
|
|
|
#define SEC_DEBUG_SIZE_OFFS SZ_512K
|
|
|
|
static u32 dhist_base;
|
|
static u32 dhist_size = SEC_DEBUG_SIZE_OFFS;
|
|
|
|
void sec_debug_hist_base_init(int extrainfo_base)
|
|
{
|
|
dhist_base = extrainfo_base + SEC_DEBUG_SIZE_OFFS;
|
|
pr_info("%s, extrainfo_base:0x%x, dhist_base:0x%x\n", __func__, extrainfo_base, dhist_base);
|
|
}
|
|
EXPORT_SYMBOL(sec_debug_hist_base_init);
|
|
|
|
static ssize_t sec_debug_hist_hist_read(struct file *file, char __user *buf,
|
|
size_t len, loff_t *offset)
|
|
{
|
|
loff_t pos = *offset;
|
|
ssize_t count, ret = 0;
|
|
char *base = NULL;
|
|
|
|
if (pos >= dhist_size) {
|
|
pr_crit("%s: pos %llx , dhist: %lx\n", __func__, pos, dhist_size);
|
|
|
|
ret = 0;
|
|
|
|
goto fail;
|
|
}
|
|
|
|
count = min(len, (size_t)(dhist_size - pos));
|
|
|
|
base = (char *)phys_to_virt((phys_addr_t)dhist_base);
|
|
if (!base) {
|
|
pr_crit("%s: fail to get va (%lx)\n", __func__, dhist_base);
|
|
|
|
ret = -EFAULT;
|
|
|
|
goto fail;
|
|
}
|
|
|
|
if (copy_to_user(buf, base + pos, count)) {
|
|
pr_crit("%s: fail to copy to use\n", __func__);
|
|
|
|
ret = -EFAULT;
|
|
} else {
|
|
pr_debug("%s: base: %p\n", __func__, base);
|
|
|
|
*offset += count;
|
|
ret = count;
|
|
}
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations dhist_file_ops = {
|
|
.owner = THIS_MODULE,
|
|
.read = sec_debug_hist_hist_read,
|
|
};
|
|
|
|
static int __init sec_debug_hist_late_init(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
char *p, *base;
|
|
|
|
base = (char *)phys_to_virt((phys_addr_t)dhist_base);
|
|
|
|
pr_info("%s: base: %p(%lx) size: %lx\n", __func__, base, dhist_base, dhist_size);
|
|
|
|
if (!dhist_base || !dhist_size)
|
|
return 0;
|
|
|
|
p = base;
|
|
pr_info("%s: dummy: %x\n", __func__, *p);
|
|
pr_info("%s: magic: %x\n", __func__, *(unsigned int *)(p + 4));
|
|
pr_info("%s: version: %x\n", __func__, *(unsigned int *)(p + 8));
|
|
|
|
entry = proc_create("debug_history", S_IFREG | 0444, NULL, &dhist_file_ops);
|
|
if (!entry) {
|
|
pr_err("%s: failed to create proc entry debug hist\n", __func__);
|
|
|
|
return 0;
|
|
}
|
|
|
|
pr_info("%s: success to create proc entry\n", __func__);
|
|
|
|
proc_set_size(entry, (size_t)dhist_size);
|
|
|
|
return 0;
|
|
}
|
|
late_initcall(sec_debug_hist_late_init);
|