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/* linux/arch/arm/mach-msm/htc_restart_handler.c
*
* Copyright (C) 2012 HTC Corporation.
* Author: Jimmy.CM Chen <jimmy.cm_chen@htc.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/kdebug.h>
#include <linux/notifier.h>
#include <linux/kallsyms.h>
#include <soc/qcom/restart.h>
#include <soc/qcom/htc_restart_handler.h>
#define MAX_SZ_DIAG_ERR_MSG 200
struct htc_reboot_params {
unsigned abnrst;
unsigned xbl_log_addr;
unsigned ddr_vendor;
unsigned lock_state;
char msg;
};
static struct htc_reboot_params *reboot_params;
static atomic_t restart_counter = ATOMIC_INIT(0);
static void *restart_reason;
static unsigned rst_msg_size;
/*
This function should not be called outside
to ensure that others do not change restart reason.
Use mode & cmd to set reason & msg in arch_reset().
*/
static inline void set_restart_msg(const char *msg)
{
if (msg) {
pr_notice("set restart msg = '%s'\n", msg);
strncpy(&reboot_params->msg, msg, rst_msg_size - 1);
} else {
strncpy(&reboot_params->msg, "", rst_msg_size - 1);
}
mb();
}
unsigned get_restart_reason(void)
{
return __raw_readl(restart_reason);
}
EXPORT_SYMBOL(get_restart_reason);
/*
This function should not be called outside
to ensure that others do not change restart reason.
Use mode & cmd to set reason & msg in arch_reset().
*/
static inline void set_restart_reason(unsigned int reason)
{
pr_notice("set restart reason = 0x%08X\n", reason);
__raw_writel(reason, restart_reason);
mb();
}
static struct die_args *tombstone = NULL;
int die_notify(struct notifier_block *self,
unsigned long val, void *data)
{
static struct die_args args;
memcpy(&args, data, sizeof(args));
tombstone = &args;
pr_debug("saving oops: %p\n", (void*) tombstone);
return NOTIFY_DONE;
}
static struct notifier_block die_nb = {
.notifier_call = die_notify,
};
static int panic_restart_action(struct notifier_block *this, unsigned long event, void *ptr)
{
char kernel_panic_msg[MAX_SZ_DIAG_ERR_MSG] = "Kernel Panic";
if (tombstone) { /* tamper the panic message for Oops */
char pc_symn[KSYM_NAME_LEN] = "<unknown>";
char lr_symn[KSYM_NAME_LEN] = "<unknown>";
#if defined(CONFIG_ARM)
sprint_symbol(pc_symn, tombstone->regs->ARM_pc);
sprint_symbol(lr_symn, tombstone->regs->ARM_lr);
#elif defined(CONFIG_ARM64)
sprint_symbol(pc_symn, tombstone->regs->pc);
sprint_symbol(lr_symn, tombstone->regs->regs[30]);
#endif
snprintf(kernel_panic_msg, rst_msg_size - 1,
"KP: %s PC:%s LR:%s",
current->comm, pc_symn, lr_symn);
} else
snprintf(kernel_panic_msg, rst_msg_size - 1, "KP: %s", (char *)ptr);
set_restart_to_ramdump(kernel_panic_msg);
return NOTIFY_DONE;
}
static struct notifier_block panic_blk = {
.notifier_call = panic_restart_action,
};
int set_restart_action(unsigned int reason, const char *msg)
{
/* only allow write msg before entering arch_rest */
if (atomic_read(&restart_counter) != 0) {
pr_warn("%s: someone call this function before\r\n", __func__);
return 1;
}
atomic_set(&restart_counter, 1);
set_restart_reason(reason);
set_restart_msg(msg ? msg: "");
return 0;
}
EXPORT_SYMBOL(set_restart_action);
int set_restart_to_oem(unsigned int code, const char *msg)
{
char oem_msg[MAX_SZ_DIAG_ERR_MSG] = "";
if (msg == NULL)
snprintf(oem_msg, rst_msg_size - 1, "oem-%x", code);
else
strncpy(oem_msg, msg, (strlen(msg) >= rst_msg_size) ? (rst_msg_size - 1): strlen(msg));
/* oem-93, 94, 95, 96, 97, 98, 99 are RIL fatal */
if ((code >= 0x93) && (code <= 0x98))
code = 0x99;
#ifdef CONFIG_HTC_HANG_DETECT_RESTART
/* oem-aa, ab are hanging detector */
else if ((code == 0xaa) || (code == 0xab))
code = 0x99;
#endif
return set_restart_action(RESTART_REASON_OEM_BASE | code, oem_msg);
}
int set_restart_to_ramdump(const char *msg)
{
return set_restart_action(RESTART_REASON_RAMDUMP, msg);
}
EXPORT_SYMBOL(set_restart_to_ramdump);
int htc_restart_handler_init(void)
{
struct device_node *np;
unsigned htc_rst_info_size;
int ret = 0;
np = of_find_compatible_node(NULL, NULL,
"qcom,msm-imem-restart_reason");
if (!np) {
pr_err("unable to find DT imem restart reason node\n");
ret = -ENOENT;
} else {
restart_reason = of_iomap(np, 0);
if (!restart_reason) {
pr_err("unable to map imem restart reason offset\n");
ret = -ENOMEM;
}
}
if (ret)
goto err_restart_reason;
np = of_find_compatible_node(NULL, NULL,
"htc,msm-imem-restart_info");
if (!np) {
pr_err("unable to find DT imem htc restart info node\n");
ret = -ENOENT;
} else {
reboot_params = of_iomap(np, 0);
if (!reboot_params) {
pr_err("unable to map imem htc restart info offset\n");
ret = -ENOMEM;
} else {
ret = of_property_read_u32(np, "info_size", &htc_rst_info_size);
if (ret) {
pr_err("%s: Failed to find info_size property in htc restart info device node %d\n"
, __func__, ret);
goto err_info_size;
}
}
}
if (ret)
goto err_restart_msg;
rst_msg_size = htc_rst_info_size - offsetof(struct htc_reboot_params, msg);
if (rst_msg_size > MAX_SZ_DIAG_ERR_MSG)
rst_msg_size = MAX_SZ_DIAG_ERR_MSG;
set_restart_reason(RESTART_REASON_RAMDUMP);
set_restart_msg("Unknown");
register_die_notifier(&die_nb);
atomic_notifier_chain_register(&panic_notifier_list, &panic_blk);
return ret;
err_info_size:
iounmap(reboot_params);
err_restart_msg:
iounmap(restart_reason);
err_restart_reason:
return ret;
}
EXPORT_SYMBOL(htc_restart_handler_init);
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