329 lines
8 KiB
C
329 lines
8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015 MediaTek Inc.
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*/
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#include <linux/delay.h>
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#include <linux/of.h>
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#include <linux/kdebug.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/sched/clock.h>
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#include <linux/slab.h>
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#include <asm/cacheflush.h>
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#include <asm/kexec.h>
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#include <asm/memory.h>
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#include <asm/stacktrace.h>
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#include <asm/system_misc.h>
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#include <mrdump.h>
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#include <mt-plat/mboot_params.h>
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#include "mrdump_mini.h"
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#include "mrdump_private.h"
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/* for arm_smccc_smc */
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#include <linux/arm-smccc.h>
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#include <uapi/linux/psci.h>
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#ifdef CONFIG_SEC_DEBUG
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#include <linux/sec_debug.h>
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#endif
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static inline unsigned long get_linear_memory_size(void)
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{
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return (unsigned long)high_memory - PAGE_OFFSET;
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}
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/* no export symbol to aee_exception_reboot, only used in exception flow */
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/* PSCI v1.1 extended power state encoding for SYSTEM_RESET2 function */
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#define PSCI_1_1_FN_SYSTEM_RESET2 0x84000012
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#define PSCI_1_1_RESET2_TYPE_VENDOR_SHIFT 31
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#define PSCI_1_1_RESET2_TYPE_VENDOR \
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(1 << PSCI_1_1_RESET2_TYPE_VENDOR_SHIFT)
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static void aee_exception_reboot(void)
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{
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struct arm_smccc_res res;
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int opt1 = 1, opt2 = 0;
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arm_smccc_smc(PSCI_1_1_FN_SYSTEM_RESET2,
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PSCI_1_1_RESET2_TYPE_VENDOR | opt1,
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opt2, 0, 0, 0, 0, 0, &res);
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}
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#if defined(CONFIG_RANDOMIZE_BASE) && defined(CONFIG_ARM64)
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static inline void show_kaslr(void)
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{
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u64 const kaslr_offset = aee_get_kimage_vaddr() - KIMAGE_VADDR;
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pr_notice("Kernel Offset: 0x%llx from 0x%lx\n",
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kaslr_offset, KIMAGE_VADDR);
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pr_notice("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
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aee_rr_rec_kaslr_offset(kaslr_offset);
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}
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#else
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static inline void show_kaslr(void)
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{
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pr_notice("Kernel Offset: disabled\n");
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aee_rr_rec_kaslr_offset(0xd15ab1e);
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}
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#endif
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static char nested_panic_buf[1024];
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int aee_nested_printf(const char *fmt, ...)
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{
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va_list args;
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static int total_len;
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va_start(args, fmt);
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total_len += vsnprintf(nested_panic_buf, sizeof(nested_panic_buf),
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fmt, args);
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va_end(args);
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aee_sram_fiq_log(nested_panic_buf);
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return total_len;
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}
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static int num_die;
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int mrdump_common_die(u8 fiq_step, int reboot_reason, const char *msg,
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struct pt_regs *regs)
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{
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int last_step;
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int next_step;
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num_die++;
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last_step = aee_rr_curr_fiq_step();
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if (num_die > 1) {
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/* NESTED KE */
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#if IS_ENABLED(CONFIG_ARM64)
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aee_reinit_die_lock();
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#endif
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}
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aee_nested_printf("num_die-%d, fiq_step-%d last_step-%d\n",
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num_die, fiq_step, last_step);
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/* if we were in nested ke now, then the if condition would be false */
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if (last_step < AEE_FIQ_STEP_COMMON_DIE_START)
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last_step = AEE_FIQ_STEP_COMMON_DIE_START - 1;
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/* skip the works of last_step */
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next_step = last_step + 1;
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switch (next_step) {
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case AEE_FIQ_STEP_COMMON_DIE_START:
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aee_rr_rec_fiq_step(AEE_FIQ_STEP_COMMON_DIE_START);
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__mrdump_create_oops_dump(reboot_reason, regs, msg);
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mrdump_mini_ke_cpu_regs(regs);
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/* FALLTHRU */
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case AEE_FIQ_STEP_COMMON_DIE_LOCK:
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aee_rr_rec_fiq_step(AEE_FIQ_STEP_COMMON_DIE_LOCK);
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#if IS_ENABLED(CONFIG_ARM64)
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aee_reinit_die_lock();
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#endif
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aee_zap_locks();
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/* FALLTHRU */
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case AEE_FIQ_STEP_COMMON_DIE_KASLR:
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aee_rr_rec_fiq_step(AEE_FIQ_STEP_COMMON_DIE_KASLR);
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show_kaslr();
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aee_print_modules();
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/* FALLTHRU */
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case AEE_FIQ_STEP_COMMON_DIE_SCP:
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aee_rr_rec_fiq_step(AEE_FIQ_STEP_COMMON_DIE_SCP);
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aee_rr_rec_scp();
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/* FALLTHRU */
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case AEE_FIQ_STEP_COMMON_DIE_EMISC:
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aee_rr_rec_fiq_step(AEE_FIQ_STEP_COMMON_DIE_EMISC);
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mrdump_mini_add_extra_misc();
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/* FALLTHRU */
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case AEE_FIQ_STEP_COMMON_DIE_TRACE:
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aee_rr_rec_fiq_step(AEE_FIQ_STEP_COMMON_DIE_TRACE);
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switch (reboot_reason) {
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case AEE_REBOOT_MODE_KERNEL_OOPS:
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aee_show_regs(regs);
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dump_stack();
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break;
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case AEE_REBOOT_MODE_KERNEL_PANIC:
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#ifndef CONFIG_DEBUG_BUGVERBOSE
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dump_stack();
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#endif
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break;
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case AEE_REBOOT_MODE_HANG_DETECT:
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aee_rr_rec_exp_type(AEE_EXP_TYPE_HANG_DETECT);
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break;
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default:
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/* Don't print anything */
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break;
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}
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/* FALLTHRU */
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case AEE_FIQ_STEP_COMMON_DIE_CS:
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aee_rr_rec_fiq_step(AEE_FIQ_STEP_COMMON_DIE_CS);
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console_unlock();
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/* FALLTHRU */
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case AEE_FIQ_STEP_COMMON_DIE_DONE:
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aee_rr_rec_fiq_step(AEE_FIQ_STEP_COMMON_DIE_DONE);
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/* FALLTHRU */
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default:
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#ifdef CONFIG_SEC_DEBUG
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sec_save_context(_THIS_CPU, regs);
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sec_debug_dump_info();
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#endif
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#ifdef CONFIG_SEC_DEBUG_AUTO_COMMENT
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dump_backtrace_auto_comment(regs, NULL);
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#endif
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aee_nested_printf("num_die-%d, fiq_step-%d, last_step-%d, next_step-%d\n",
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num_die, fiq_step,
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last_step, next_step);
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aee_exception_reboot();
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break;
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}
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return NOTIFY_DONE;
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}
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EXPORT_SYMBOL(mrdump_common_die);
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int ipanic(struct notifier_block *this, unsigned long event, void *ptr)
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{
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struct pt_regs saved_regs;
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aee_rr_rec_exp_type(AEE_EXP_TYPE_KE);
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crash_setup_regs(&saved_regs, NULL);
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#ifdef CONFIG_SEC_DEBUG
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sec_upload_cause(ptr);
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#endif
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return mrdump_common_die(AEE_FIQ_STEP_KE_IPANIC_START,
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AEE_REBOOT_MODE_KERNEL_PANIC,
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"Kernel Panic", &saved_regs);
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}
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static int ipanic_die(struct notifier_block *self, unsigned long cmd, void *ptr)
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{
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struct die_args *dargs = (struct die_args *)ptr;
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aee_rr_rec_exp_type(AEE_EXP_TYPE_KE);
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#ifdef CONFIG_SEC_DEBUG
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sec_upload_cause((void *)(dargs->str));
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#endif
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return mrdump_common_die(AEE_FIQ_STEP_KE_IPANIC_DIE,
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AEE_REBOOT_MODE_KERNEL_OOPS,
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"Kernel Oops", dargs->regs);
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}
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static struct notifier_block panic_blk = {
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.notifier_call = ipanic,
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};
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static struct notifier_block die_blk = {
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.notifier_call = ipanic_die,
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};
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static __init int mrdump_parse_chosen(struct mrdump_params *mparams)
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{
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struct device_node *node;
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u32 reg[2];
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const char *lkver, *ddr_rsv;
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memset(mparams, 0, sizeof(struct mrdump_params));
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node = of_find_node_by_path("/chosen");
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if (node) {
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if (of_property_read_u32_array(node, "mrdump,cblock",
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reg, ARRAY_SIZE(reg)) == 0) {
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mparams->cb_addr = reg[0];
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mparams->cb_size = reg[1];
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pr_notice("%s: mrdump_cbaddr=%x, mrdump_cbsize=%x\n",
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__func__, mparams->cb_addr, mparams->cb_size);
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}
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if (of_property_read_string(node, "mrdump,lk", &lkver) == 0) {
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strlcpy(mparams->lk_version, lkver,
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sizeof(mparams->lk_version));
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pr_notice("%s: lk version %s\n", __func__, lkver);
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}
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if (of_property_read_string(node, "mrdump,ddr_rsv",
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&ddr_rsv) == 0) {
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if (strcmp(ddr_rsv, "yes") == 0)
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mparams->drm_ready = true;
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pr_notice("%s: ddr reserve mode %s\n", __func__,
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ddr_rsv);
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}
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return 0;
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}
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of_node_put(node);
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pr_notice("%s: Can't find chosen node\n", __func__);
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return -1;
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}
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#ifdef CONFIG_MODULES
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/* Module notifier call back, update module info list */
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static int mrdump_module_callback(struct notifier_block *nb,
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unsigned long val, void *data)
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{
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if (val == MODULE_STATE_LIVE)
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mrdump_modules_info(NULL, -1);
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return NOTIFY_DONE;
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}
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static struct notifier_block mrdump_module_nb = {
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.notifier_call = mrdump_module_callback,
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};
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#endif
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static int __init mrdump_panic_init(void)
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{
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struct mrdump_params mparams = {};
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if (!aee_is_enable()) {
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pr_notice("%s: ipanic: mrdump is disable\n", __func__);
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return 0;
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}
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mrdump_parse_chosen(&mparams);
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#ifdef MODULE
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mrdump_module_init_mboot_params();
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#endif
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mrdump_hw_init(mparams.drm_ready);
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mrdump_cblock_init(mparams.cb_addr, mparams.cb_size);
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if (mrdump_cblock == NULL) {
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pr_notice("%s: MT-RAMDUMP no control block\n", __func__);
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return -EINVAL;
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}
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mrdump_mini_init(&mparams);
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if (strcmp(mparams.lk_version, MRDUMP_GO_DUMP) == 0) {
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mrdump_full_init();
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} else {
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pr_notice("%s: Full ramdump disabled, version %s not matched.\n",
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__func__, mparams.lk_version);
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}
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atomic_notifier_chain_register(&panic_notifier_list, &panic_blk);
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register_die_notifier(&die_blk);
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#ifdef CONFIG_MODULES
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register_module_notifier(&mrdump_module_nb);
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#endif
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pr_debug("ipanic: startup\n");
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return 0;
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}
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arch_initcall(mrdump_panic_init);
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#ifdef MODULE
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static void __exit mrdump_panic_exit(void)
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{
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atomic_notifier_chain_unregister(&panic_notifier_list, &panic_blk);
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unregister_die_notifier(&die_blk);
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unregister_module_notifier(&mrdump_module_nb);
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pr_debug("ipanic: exit\n");
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}
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module_exit(mrdump_panic_exit);
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#endif
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