300 lines
7 KiB
C
300 lines
7 KiB
C
/*
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* sec_debug_auto_comment.c
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*
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* Copyright (c) 2022 Samsung Electronics Co., Ltd
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* http://www.samsung.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/file.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/kallsyms.h>
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#include <linux/memblock.h>
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#include <linux/sec_debug.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <asm/sections.h>
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#include <linux/memblock.h>
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#include <linux/of.h>
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#include <linux/of_reserved_mem.h>
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static u32 sec_auto_comment_base;
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static struct sec_debug_auto_comm_log_idx ac_idx[SEC_DEBUG_AUTO_COMM_BUF_SIZE];
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static struct sec_debug_auto_comment *auto_comment_info;
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static char *auto_comment_buf;
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void sec_debug_auto_comment_log_disable(int type)
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{
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atomic_inc(&(ac_idx[type].logging_disable));
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}
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void sec_debug_auto_comment_log_once(int type)
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{
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if (atomic64_read(&(ac_idx[type].logging_entry)))
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sec_debug_auto_comment_log_disable(type);
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else
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atomic_inc(&(ac_idx[type].logging_entry));
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}
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static inline void sec_debug_hook_auto_comm(int type, const char *buf, size_t size)
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{
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struct sec_debug_auto_comm_buf *p = &auto_comment_info->auto_comm_buf[type];
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unsigned int offset = p->offset;
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if (atomic64_read(&(ac_idx[type].logging_disable)))
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return;
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if (offset + size > SZ_4K)
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return;
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if (init_data[type].max_count &&
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(atomic64_read(&(ac_idx[type].logging_count)) > init_data[type].max_count))
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return;
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if (!(auto_comment_info->fault_flag & 1 << type)) {
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auto_comment_info->fault_flag |= 1 << type;
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if (init_data[type].prio_level == PRIO_LV5) {
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auto_comment_info->lv5_log_order |= type << auto_comment_info->lv5_log_cnt * 4;
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auto_comment_info->lv5_log_cnt++;
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}
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auto_comment_info->order_map[auto_comment_info->order_map_cnt++] = type;
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}
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atomic_inc(&(ac_idx[type].logging_count));
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memcpy(p->buf + offset, buf, size);
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p->offset += (unsigned int)size;
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}
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static int sec_debug_auto_comment_init_print_buf(void)
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{
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auto_comment_buf = (char *)phys_to_virt(sec_auto_comment_base);
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auto_comment_info = (struct sec_debug_auto_comment *)(phys_to_virt(sec_auto_comment_base) + SZ_8K);
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if (!auto_comment_buf || !auto_comment_info) {
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pr_crit("%s: no buffer for auto comment\n", __func__);
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return 0;
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}
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memset(auto_comment_info, 0, sizeof(struct sec_debug_auto_comment));
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register_set_auto_comm_buf(sec_debug_hook_auto_comm);
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pr_info("%s: done\n", __func__);
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return 1;
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}
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#if 0
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static unsigned long sas_size;
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static unsigned long sas_base;
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static void * __init sec_debug_auto_comment_remap(unsigned long size, unsigned long base)
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{
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unsigned long i;
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pgprot_t prot = __pgprot(PROT_NORMAL_NC);
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int page_size;
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struct page *page;
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struct page **pages;
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void *addr;
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pr_info("%s: base: 0x%lx size: 0x%lx\n", __func__, base, size);
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page_size = (size + PAGE_SIZE - 1) / PAGE_SIZE;
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pages = kzalloc(sizeof(struct page *) * page_size, GFP_KERNEL);
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if (!pages) {
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pr_err("%s: failed to allocate pages\n", __func__);
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return NULL;
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}
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page = phys_to_page(base);
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for (i = 0; i < page_size; i++)
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pages[i] = page++;
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addr = vm_map_ram(pages, page_size, -1, prot);
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if (!addr) {
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pr_err("%s: failed to mapping between virt and phys\n", __func__);
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kfree(pages);
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return NULL;
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}
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pr_info("%s: virt: 0x%p\n", __func__, addr);
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kfree(pages);
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return addr;
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}
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static int __init sec_debug_auto_comment_log_setup(char *str)
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{
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unsigned long size = memparse(str, &str);
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unsigned long base = 0;
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/* If we encounter any problem parsing str ... */
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if (!size || *str != '@' || kstrtoul(str + 1, 0, &base)) {
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pr_err("%s: failed to parse address.\n", __func__);
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return -1;
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}
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if (size < sizeof(struct sec_debug_auto_comment)) {
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pr_err("%s: not enough size for auto comment\n", __func__);
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return -1;
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}
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sas_base = base;
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sas_size = size;
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#ifdef CONFIG_NO_BOOTMEM
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if (memblock_is_region_reserved(base, size) ||
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memblock_reserve(base, size)) {
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#else
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if (reserve_bootmem(base, size, BOOTMEM_EXCLUSIVE)) {
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#endif
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/* size is not match with -size and size + sizeof(...) */
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pr_err("%s: failed to reserve size:0x%lx at base 0x%lx\n",
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__func__, size, base);
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sas_base = 0;
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sas_size = 0;
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return -1;
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}
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return 1;
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}
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__setup("auto_comment_log=", sec_debug_auto_comment_log_setup);
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static int __init sec_debug_auto_comment_base_init(void)
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{
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void *addr;
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if (!sas_size) {
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pr_err("%s: failed to get size of auto comment\n", __func__);
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return -1;
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}
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addr = sec_debug_auto_comment_remap(sas_size, sas_base);
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if (!addr) {
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pr_err("%s: failed to remap size:0x%lx at base 0x%lx\n",
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__func__, sas_size, sas_base);
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return -1;
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}
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sec_debug_auto_comment_init_print_buf((unsigned long)addr);
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return 0;
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}
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early_initcall(sec_debug_auto_comment_base_init);
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static int __init sec_debug_auto_comment_log_init(void)
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{
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if (auto_comment_info) {
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auto_comment_info->header_magic = AC_MAGIC;
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auto_comment_info->tail_magic = AC_TAIL_MAGIC;
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}
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pr_debug("%s, done.\n", __func__);
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return 0;
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}
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subsys_initcall(sec_debug_auto_comment_log_init);
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#endif
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static ssize_t sec_debug_auto_comment_proc_read(struct file *file, char __user *buf, size_t len, loff_t *offset)
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{
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loff_t pos = *offset;
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ssize_t count;
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if (!auto_comment_buf) {
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pr_err("%s : buffer is null\n", __func__);
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return -ENODEV;
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}
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if (pos > AC_SIZE) {
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pr_err("%s : pos 0x%llx\n", __func__, pos);
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return 0;
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}
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if (strncmp(auto_comment_buf, "@ Ramdump", 9)) {
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pr_err("%s : no data in auto_comment\n", __func__);
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return 0;
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}
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count = min(len, (size_t)(AC_SIZE - pos));
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if (copy_to_user(buf, auto_comment_buf + pos, count))
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return -EFAULT;
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*offset += count;
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return count;
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}
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static const struct file_operations sec_debug_auto_comment_proc_fops = {
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.owner = THIS_MODULE,
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.read = sec_debug_auto_comment_proc_read,
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};
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static int __init sec_debug_auto_comment_proc_init(void)
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{
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struct proc_dir_entry *entry;
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pr_info("%s: start\n", __func__);
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entry = proc_create("auto_comment", 0400, NULL,
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&sec_debug_auto_comment_proc_fops);
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if (!entry)
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return -ENOMEM;
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proc_set_size(entry, AC_SIZE);
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pr_info("%s: done\n", __func__);
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return 0;
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}
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late_initcall(sec_debug_auto_comment_proc_init);
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static int __init sec_debug_auto_comment_init(void)
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{
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int i;
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struct reserved_mem *rmem;
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rmem = sec_log_get_rmem("samsung,sec-autocomment");
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sec_auto_comment_base = rmem->base;
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if (!sec_debug_auto_comment_init_print_buf())
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return -1;
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pr_info("%s: start\n", __func__);
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if (auto_comment_info) {
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auto_comment_info->header_magic = AC_MAGIC;
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auto_comment_info->tail_magic = AC_TAIL_MAGIC;
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}
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for (i = 0; i < SEC_DEBUG_AUTO_COMM_BUF_SIZE; i++) {
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atomic_set(&(ac_idx[i].logging_entry), 0);
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atomic_set(&(ac_idx[i].logging_disable), 0);
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atomic_set(&(ac_idx[i].logging_count), 0);
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}
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pr_info("%s: done\n", __func__);
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return 0;
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}
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early_initcall(sec_debug_auto_comment_init);
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